MACHINE TOOL, METHODS FOR CREATING AND INSPECTING AN ARTICLE, AND, PROCESSING HEAD

专利摘要:
machine tool, method for creating and inspecting an article, and processing head. the application describes a machine tool adapted and arranged to perform removal and addition of material on a workpiece positioned at a work station, the machine having a first head arranged to remove material from the workpiece and at least one second head arranged to process the workpiece, each of the first and second heads being arranged to be movable in at least two geometry axes and preferably in 3, 4 or 5 geometry axes and wherein the machine is arranged to control an environment of the workstation. the workstation is at least partially sealable. the machine has a clean side and a dirty side. new processing heads particularly adapted for use in new machine tools are described. these can also be retrofitted to cnc machines. the new heads include heads adapted to perform two processes simultaneously. heads adapted to perform heat and pressure treatment are also described. the use of processing heads to perform analysis in the manufacturing steps is described as the provision and use of heads that can perform analysis as well as processing.
公开号:BR112016028857B1
申请号:R112016028857-2
申请日:2015-06-09
公开日:2021-08-24
发明作者:Peter Coates；Jason B. Jones
申请人:Hybrid Manufacturing Technologies Limited；
IPC主号:

专利说明:

[001] This invention relates to a method for processing materials and an apparatus for carrying out the method. In particular, the method and apparatus refer to the manufacturing of additives and CNC machining.
[002] Additive manufacturing (IT) is a technology in which articles, or at least portions thereof, are manufactured, repaired, or similar, by adding material; this can be done via a standalone three-dimensional printer, a dedicated IT or deposition system using a robot, machine tool or similar. A suitable apparatus for the provision of such an additive manufacturing is shown in WO2014/013247 in the name of Ex Scintilla Ltd.
[003] Material removal techniques, such as milling, and the like, are also well known. Typically, such material removal can be facilitated through the use of Computer Numerical Control (CNC) machines, which automate the material removal process.
[004] IT and CNC can be combined so that an article can be manufactured or repaired using IT and eventually surface processed using material removal, such as CNC material removal and this process is illustrated with reference to the figure 1.
[005] It is known to use a machine that has a number of heads permanently connected to the tool and selectable for work on a workpiece. Such arrangements increase the space and volume occupied by a machining head, which restricts the machining head's operation. It is also known to move a workpiece from one workstation to another, where each workstation performs a specific operation, including additive steps and post-deposition and cutting treatment.
[006] It is known to provide arrangements that provide processing heads that can be adapted to existing machine tools, such as multiaxial CNC milling machines. However, the capabilities of such prior art processing heads can be expanded where desired, and improved heads are described in published application number WO/2014/013247, and also in unpublished application numbers: GB 1412843.3 and GB 1423407.4 of which this request claims priority.
[007] On previous machines, a suitable head was designed and used on existing CNC machines as described in previous orders. However, it was appreciated that there are disadvantages where an existing machine tool designed for milling is used for additive manufacturing. These disadvantages can be characterized by the fact that milling machines are intended to form only the outer surface of a part. This is not surprising since the internal characteristics of the part are determined by the preparation of the starting billet, from which a part is cut. The addition of material during additive manufacturing or three-dimensional printing not only shapes the outer surface, but also forms key features of the part's internal volume (including the microstructure) when it is made. As such, it is desirable to be able to keep the environment as clean as possible to avoid introducing defects during formation. In addition, in order to provide quality assurance, it is desirable to access the internal volume of a part (including microstructure) as well as the surface and chemistry topology at the nano, micro, meso and macro scale, when the part or product is done, in real time or at least on the spot.
[008] According to a first aspect of the invention there is provided a machine adapted and arranged to carry out removal and addition of material in a workpiece positioned at a work station, the machine having a first device arranged to remove material from of the workpiece and a second device arranged to process the workpiece, each of the first and second devices being arranged to be movable in at least two axes.
[009] In some modalities, the first and second devices can each be movable in 3, 4 or 5 axes.
[0010] Preferably, the first device is a mechanism comprising a first carriage, in which a plurality of interchangeable supply heads are process heads that can be detachably supported, in use, and the interchangeable process heads being storable in a first tool changer. Desirably, the second device is a mechanism comprising a second carriage on which a plurality of interchangeable supply heads that are processing heads and machining heads that can be detachably mounted, the removable processing heads for the second device being storable in a second tool changer.
[0011] The depositor has developed new and better processing heads and methods of using those heads in existing machines. The applicant has also realized that processing heads can be particularly useful in a machine specifically designed to take advantage of the characteristics of the heads and the methods of using the heads that have been developed.
[0012] It will be appreciated that the processing head may either be arranged to remove material from the workpiece or may be otherwise arranged to process the workpiece by addition or deposition of material or may be arranged to inspect or monitor the work piece. Such heads can be loosely referred to as processing heads. In some cases, it will be appreciated that the processing head can be arranged to process workpieces by heat treatment and may remove some of the material from the workpiece in processing. Other processing heads are arranged to remove material from the workpiece.
[0013] Desirably, each tool changer has a number of processing heads stored in it. The first tool changer preferably stores processing heads designed to remove material from a workpiece. Such heads can be arranged to perform milling, grinding, flattening, drilling, ablation, machining and other material removal processes, as are well known in the art. Machining can be laser assisted and the processing head can use coaxial laser supply or off-axis laser supply.
[0014] The second tool changer preferably stores processing heads designed and arranged to process material into a workpiece. Such heads are described in the prior orders referenced above and include heads arranged to process workpiece material, such as by deposition or material modification or inspection, detection or production of the workpiece being created, such as by deposition with a galvo laser, coating as with a laser coating head or a 90° laser coating head, such as by extruding a material including a 90° extrusion head, heat treatment, hammering, scarifying, shot hammering, hammering or micro-hammering, needle hammering, laser hammering or lamination. The heads can be arranged to perform induction heating, inert atmosphere arc welding (MIG welding), transferred arc plasma welding (PTA welding), application of a vacuum; blow air over the workpiece; assisted performance of laser machining; applying a coating to the workpiece, such as with an HVOF coating or using electrical discharge machining (EDM). Heads can also be arranged to lay material using 3D manufacturing processes. Additionally, the second tool changer may contain heads which may be any one or more of the following: an image recording apparatus; lighting, either fixed or mobile; touch probes; 3D surface (including laser and structured light varieties) and volumetric scanners including confocal, focus range, interferometry and structured light scanners; photogrammetry systems, sensors (such as oxygen sensors; thermal sensors; thermal cameras) eddy current generators, ultrasound transducers (for air, gel, and liquid-coupled), electromagnetic wave generators, induction heating coils, electromagnet(s), an amplification device such as a confocal microscope, incremental sheet forming tools, flame thrower, vacuum, induction heater, galvanometer, oscilloscopes, digital mirror devices, structured light scanners, emery, abrasives, variations at right angle heads, microscopes, confocal or variable microscopes, electromagnetic detectors including gamma and X-rays, spectrographs, etc.
[0015] Preferably each tool changer is adapted to store from 5 to 50 heads, or more Preferably from 10 to 40 heads or most Preferably from 25 to 35 heads. It will be appreciated, however, that, as in common practice, a tool changer can be expanded to store more heads, if required.
[0016] Preferably, the respective tool changers store the remote processing heads of the workpiece. Such storage of heads at a location remote from the workpiece allows a greater number of heads to be stored and available for selection as well as prevents them from being contaminated by the workpiece. Additionally, as only the “in use” head is attached, there is a greater range of motion available to the head relative to the workpiece. In a preferred mode, the first car is parked while the second car is in use, and vice versa.
[0017] Preferably, the machine comprises a body having a clean side and a dirty side. Each side may comprise a sealable chamber. Preferably, at least the clean side comprises a sealable chamber. The clean side may comprise a chamber, such as a tool changer, in which clean heads are stored. The dirty side may comprise a chamber, such as a tool changer, in which "dirty" heads are stored. Such "dirty" heads can be used for removing material from a workpiece. The first and second tool changers are preferably remote from the workstation.
[0018] Desirably, the machine is arranged to control a workstation environment
[0019] Desirably, the workstation is positioned between the clean side and the dirty side. In a preferred embodiment, the workstation is at least semi-protected. The workstation can be provided in a chamber. The chamber can be sealed or it can be sealable or partially sealable.
[0020] It may be possible to change an environment in the workstation chamber to be a clean environment, depending on the process being performed. In some embodiments, the workstation can be provided with a chamber that can be flooded with an inert gas such as argon or nitrogen. In some embodiments, the atmosphere in the chamber can be controlled to have a low oxygen content and/or to have a low level of particulate contamination. An inert gas can flow through the chamber. In other embodiments, the chamber may be sealable, and the workpiece may be submerged in an inert gas. Inert gas can also be provided as a refrigerant.
[0021] In some embodiments, the carriage may provide a means for supplying fluid to the chamber or workpiece. The fluid can be a gas. The gas may be inert and/or may be acting as a refrigerant. In some cases, the gas can assist in the extraction of waste material. In other cases, an inert atmosphere can be provided and a refrigerant gas can be supplied to the workpiece, in addition. Where the workpiece is submerged in an inert gas, any extracting waste material or refrigerant preferably rises above the level of the inert gas, so that in extracting refrigerant and waste material, the inert gas is not expelled from the chamber. A means of extracting waste can be provided. In a preferred embodiment, an extraction point is provided, which is connected to a duct on the machine. Preferably, residue is removed by means of an Archimedes screw operating in the duct. This arrangement preferably draws the refrigerant directly above the center of the screw and out of the chamber, still always leaving a column of inert gas and fluid in the duct, which would provide a natural air-tight barrier between the chamber and the atmosphere.
[0022] It is desirable to manage heat in the workpiece. When material, particularly metal, is deposited, the workpiece receives heat and this can cause problems such as end piece distortion.
[0023] It is possible to manage heat in the workpiece by alternating between metal deposition and metal machining with a coolant. At least some of the heat in the workpiece is transferred to the coolant, which can be a gaseous or liquid cutting fluid. It will be appreciated that this method of operation is effective and can keep the workpiece at a temperature less than approximately 1/3 of the melting point of the material, which maintains a level of stability in most materials. Such a stepwise alternation may not be the optimal sequence for maximum productivity, but it manages the workpiece temperature and can be used in existing machine tools that are retrofitted with process heads.
[0024] In some embodiments, the chamber may be at least partially sealable. It is desirable in workpiece heat management for the workstation to be liquid cooled. Typically, the work piece will be held in a work holding device on a platform at the workstation. The platform or at least the work restraint device can be cooled with a cooling liquid or gas so that heat generated by deposition of material on the workpiece is removed through conduction to the work restraint device and to inside the cooling system. Advantages were found in the fact that cooling allows higher duty cycles to be maintained for deposition. Additionally, the machine is insulated from the heat of the workpiece, which helps the machine's geometric axes maintain the precision for which they are designed to retain and prevent damage due to thermal expansion of moving parts.
[0025] In other embodiments, the chamber may be sealable and a vacuum may be applied to the sealed chamber so that material processing is carried out in a vacuum or under reduced pressure relative to atmospheric. Alternatively, it may be desirable to increase the pressure in the chamber to above atmospheric pressure.
[0026] In some embodiments, the chamber may be unitary on at least two, three, four or five sides. A lid or other sealing mechanism may be provided to seal the chamber. In other embodiments, a sealing port can be provided. Preferably, a means for introducing a gas or applying a vacuum is provided on at least one face of the chamber or port.
[0027] In other embodiments, the chamber may be partially open and may be provided with a local shield. Such local shielding can be expelled to the open state, or, preferably, can be confined by using a bag, such as a plastic bag, or a skirt that can be positioned around the workpiece during processing. The skirt could be supported on a plunger and the location of the skirt around the workpiece could be automatic.
[0028] In a preferred embodiment, the first and second devices are movable in at least geometric x, y and z axes. In a preferred embodiment, the devices are slidable on at least one of the geometric x, y and z axes. Preferably, one of the sliding geometry axes is in the x directions and a rail is provided which is common to the first and second devices. In some modalities, the first and second carriages are each supported on respective first and second supports. The first and second supports are preferably each slidable on the rail, thus providing movement for the first and second carriages in the x direction. In a preferred embodiment, each car is movable in the z-direction with respect to the support. Desirably, the movement of the first and second carriages over the first and second supports in the y direction is parallel.
[0029] In some embodiments, the machine can be provided with another variation by controlling the orientation of a platform supporting the workpiece. The platform can be fixed, providing a flat table, or it can be rotatable, or it can, in some cases, be arranged to tilt as well as rotate.
[0030] The platform and chamber are advantageously arranged to accommodate a workpiece having a size, as is known in the machine tool art.
[0031] Typically, the machine is cuboid and the total size of the space occupied by the machine is from 1 m to 5 m or more preferably from 2 m to 4 m or most preferably about 3 m.
[0032] The machine is preferably optimized for high-speed machining in smooth passes, since the amount of heavy cutting, traditionally known as "roughing" would be reduced due to the addition of material, which is close to the desired shape, and by Therefore, a workpiece will most often require "finishing machining".
[0033] Historically, many of the processing and removal heads used so far have used a lateral snap-in system.
[0034] Preferably, the machine provides an integrated snapping system. The integrated snap-in system can supply material and power to a processing head on the first or second carriage, which can be arranged to remove material from the workpiece or can be arranged to process the workpiece.
[0035] In a preferred embodiment, the fitting system is arranged to provide a clean connection between a processing head and the fitting manifold on the machine. An operable seal can be provided on both halves of the coupling manifold. In addition, portions of the head that are sensitive to contamination, such as optical windows for laser energy, can be covered by a sliding or rotating door, which is only opened after the head collector and snap-on collector are attached, eliminating thus the opportunity for contaminants to accumulate on said sensitive areas when the head or socket is in a storage position. Also, the placement of an air knife can be used to blow out any contaminants after the doors are closed, to ensure that the dust ports and other plug-in manifold connections can be kept clean.
[0036] Material supplied for the processing head can be in the form of powder, fluid or filaments. In some embodiments, the material can comprise a polymer material. In other embodiments, the material can be selected from a group comprising metals, non-metals, polymers, ceramics, clay, salts, conductive, capacitive or dielectric materials, in powder form, filaments, rods, fiber sheets (short, chopped, long or continuous), or metallic threads, in solid or semi-liquid to completely liquid form. Alternatively, materials can be provided in suspension in a liquid, emulsion, gas, aerosol or paste. In combination with a matrix material, continuous or discontinuous fibers can also be deposited to form a composite material. In a preferred embodiment, the medium may comprise a bead or filament polymer. Typically, such a raw material can be heated by an energy source to a temperature such that the material can be fed, directed, extruded, blasted or otherwise deposited in a controllable manner. Alternatively, a fluid material can be supplied to the processing head from a medium reservoir that can be provided on the machine. The material can be heated by an energy source until all of the material in the reservoir is fluid and can be extruded in a controllable manner. In some embodiments, the material may also comprise conductive, semiconductor, capacitive, piezoelectric and dielectric material so that electrical circuits can be fitted during the formation of the workpiece.
[0037] In another preferred embodiment, the medium may comprise metals, which may be provided in the form of metal powders or wires. Such metals can be used in forming the body of the workpiece or can be applied to a part of the workpiece to seat electronic circuitry.
[0038] A particular advantage of the machine is that a wide variety of heads can be provided and these heads are capable of depositing material in order to produce work pieces complete with electronic components, biological and other functional subsystems, embedded.
[0039] It is contemplated that the machine may be used to produce prototypes, end-use products and whole products.
[0040] In a preferred embodiment, the integrated fitting system is arranged to be able to supply material and power to the processing head when required. Preferably, the laser energy required for processing is supplied parallel to the z-axis, but from a point removed from close proximity to the work area. It will be appreciated that advantages arise when the laser beam path can be steered and thus the laser energy that can be delivered is less reduced because of the use of fewer reflectors and optical components than with the side-fitting laser power supply which requires the use of mirrors in the beam path.
[0041] In a preferred embodiment, the fitting may be provided on an upper face of the processing head and the integral fitting on the carriage is arranged to align and to mate with a manifold on the carriage with the processing head.
[0042] In other embodiments, a collector and fitting means may be provided on a carriage collar. The carriage may comprise a spindle arranged to be movable in the z direction and the plug-in manifold may be provided on a spindle collar.
[0043] The provision of an integral power source in the machine has a number of advantages. In some embodiments, the energy sources may be through a beam directed over the workpiece. The control means can be provided to control the applied energy beam and the source can be selected from lasers such as infrared lasers, visible light lasers and UV lasers. Pulse durations can be controlled to range from an attosecond (as) to femtosecond (fm) and so on to continuous wave durations (CW). The selected energy sources can be chosen depending on the process being carried out - either removing, adding or changing the material. Energy sources and pulse duration can also be selected to optimize the energy absorption capacity of the material to be processed. A beam switch can also be used to switch between different laser beam sources.
[0044] In some embodiments, power sources can be supplied to the workpiece or to the processing head, particularly a processing head, using a fiber optic cable arranged to be transported by the carriage to the processing head. It will be appreciated that in some cases a hollow core may be required due to energy density.
[0045] As already discussed, the machine has a clean side and a dirty side and the workpiece can be positioned in a chamber. Preferably, the processing heads or deposition heads are kept in a clean condition. It will be understood that contamination of the workpiece in the course of depositing or processing the workpiece may lead to poor quality finishes or imperfections in the material. It is therefore important to keep the used processing heads on the clean side free from contamination or to minimize the contamination that may occur.
[0046] Preferably, the machine, and particularly the processing heads, are cooled using a cryogenic cooling system. In a particularly preferred embodiment, an organic refrigerant is used which evaporates, vaporizes, flatulizes or otherwise ignites to form products with a very low ash content and which leave no residue. It will be appreciated that other refrigerants can be used, such as liquid nitrogen.
[0047] In some embodiments, coolant can be supplied to the chamber or coolant can be supplied to the workpiece or to the processing head.
[0048] The clean side can be maintained by provision of seals between the chamber and the clean tool changer. Any processing heads used for depositing or processing can be stored in the second tool changer and the second tool chamber can be properly sealed. Processing heads used for milling do not need to be kept in a clean environment and are stored in the first tool changer when not in use. As the first tool changer is on the "dirty" side, the first tool changer does not need to be sealed to the chamber or workpiece.
[0049] In a particularly preferred embodiment, the machine is provided with doubled supports and the carriages arranged to move in the z direction. In some cases, brackets and carts are the same. In other cases, it may be preferable to provide specialized sockets and collectors on each of the brackets and respective carriages. As discussed above, one of the holders and carriages is used exclusively for clean processing and the other holder and carriage are used exclusively for "dirty" processes.
[0050] Preferably, fitting of the heads to the carriage and support is arranged to maintain a clean environment. Preferably, the optical components of the laser processing heads are not exposed to air and are kept in a clean environment at all times. In some embodiments, an automatic cover system is provided, whereby actuation of a cover in the socket opens a corresponding port in a selected processing head. Once the fitting of the head to the carriage has been completed, the system is sealed. Automation of the snapping process allows the process to take place without visual inspection being required. It will be appreciated, therefore, that a machine equipped with an automated fitting and which does not require visual inspection can use higher energy lasers as it is no longer necessary to provide laser safety windows for inspection.
[0051] In some embodiments, the environment can be maintained as a clean environment by the use of air and air purge knives. This can be particularly desirable around the areas used for head swapping and for fitting the head to the carriage.
[0052] It is desirable that the second processing heads are kept in a clean environment during storage in the second tool changer. Preferably, a separate storage area is provided for processing heads. In some preferred embodiments, the processing heads can be reverted to the tool changer so that the face of the processing head is sealed against a pocket surface of the tool changer. Another important area is dust control used in workpiece additive manufacturing. Typically, powder is applied to the workpiece surface. It is commonly a problem that some of the dust will not be retained on the workpieces. In some cases, there will be overspray.
[0053] Desirably, the machine comprises a waste extractor. This can be used to remove swarf or shavings from the bottom of the work area, where it accumulates with the cutting fluid. Additionally, vapors and moisture can be removed from the work area using proper filtration, extraction and dehumidification. Such a filtration/dehumidification system prevents volatile contaminants and moisture from affecting work area cleanliness.
[0054] In a preferred embodiment, there is integrated capture of the overspray powder. In some cases, a tray can be provided on the machine, which can be slid into the chamber to capture over-sprayed powder. Preferably, the material captured by the tray can be collected and can be reused directly or it can be reconditioned and reused. Some material may escape from the dust collection tray. Such material is typically removed from the chamber with the refrigerant and can be filtered from the refrigerant and reused.
[0055] An important aspect of the machine is the provision of integral monitoring of the workpiece and the processing head or heads.
[0056] In known systems, in which a workpiece is milled or cut or processed by material removal, the workpiece is typically considered to be of good quality. However, in additive manufacturing it has been realized that it is important that the quality of the workpiece ensure that the processing has been carried out to a high level to ensure that any additive manufacturing is of good quality. Therefore, it is important to monitor the processes and the workpiece to ensure that any imperfections are detected.
[0057] Preferably, at least one of the following monitoring methods can be provided on the machine. Smelting deposit in additive processing or production or additive manufacturing can be monitored. A workpiece thermal history can be monitored and recorded using thermal cameras. Oxygen sensors can be provided in the chamber. Spectroscopy can be used to analyze parts of the workpiece in processing. Such monitoring can be provided in the car or can be separately provided in the chamber of the engine.
[0058] Additionally or alternatively, processing can be monitored by the use of accelerometers in the processing head. Calibration routines can be performed using detectors positioned in the chamber. Such routines can be arranged to monitor the or each processing head and/or workpiece. Desirably, wireless communication is enabled between the processing heads and a controller on the machine. Communication with a remote controller or remote output can also be provided. Such communication can use IR or radio data transfer. Additionally, processing data communication using MT connection can be used or other established wireless protocols.
[0059] In some embodiments, a focal length of any of the optical elements can be monitored and data can be output.
[0060] In one embodiment, sensors and circuitry can be embedded in a work piece, as it is being made, to form a monitoring device that can monitor the condition and completeness of a part in use. Preferably, such sensors and monitoring devices to be printed in and on the workpieces can be arranged to function and provide feedback to users prior to completion of said part. It is contemplated that the monitoring devices may continue to function through the entire service life of the part. An example of such a monitoring device would be a stress detection circuit, which could detect when a device has been loaded beyond a safe condition.
[0061] In some preferred embodiments, data from the machine and from the processing heads can be output to the remote monitoring means. Preferably, a machine and delivery heads performance and data with respect to the chamber and workpiece are monitored and reported in real time. In some modalities, an analysis can be performed in real time. Preferably, a statistical analysis can be performed to predict workpiece failure. In some embodiments, analysis can be applied to the process heads to identify potential process heads failure. In all cases, it is preferable that the detections form a closed-loop feedback system to ensure quality production of parts and, if necessary, allow corrective rework of parts areas that do not meet acceptable quality standards, on site , to avoid scratching the part.
[0062] According to an aspect of the invention there is provided a machine according to an aspect of the invention, wherein at least one carriage is provided with an integrated locking system.
[0063] Preferably, the fitting system is arranged so that the fitting between the carriage and the head is on an upper face of the processing head.
[0064] Desirably integral engagement with carriage aligns and joins a collector on the carriage with a cooperating collector on the processing head. In some preferred embodiments, the manifold is directed perpendicular to the loading axis of the supply head. This can eliminate or reduce the need for the supply snap-in manifold to be moved, as the processing head's snapping action also effected the snapping of the manifolds. This action has been found to be particularly suitable for power sources that do not require a line of sight, but can also be used with lasers and other power sources.
[0065] In a preferred embodiment, the connection between the carriage and the processing head is arranged to be sealable so as to preferably exclude contaminants.
[0066] In some embodiments, the processing head collector is arranged to be fixed. However, in some preferred embodiments, the manifold is arranged to move outwardly from the processing head to a docked position. This has been found to be particularly advantageous when the processing head takes up less space in the tool changer. In addition, in the storage position, a seal can be provided over the collector. This is particularly advantageous for processing heads that are used on the clean side and for which it is desirable to keep all of the elements in as clean a state as possible. Such a seal can be provided by a sliding door.
[0067] A deposition head comprising an electrode that provides power to a workpiece and a medium supply, wherein the head comprises means for generating an integral electromagnetic field arranged to bend an arc between the electrode and the workpiece.
[0068] The integration of additive manufacturing technology into a CNC machine has prompted new proposals for the supply of beams, to maximize the utility of the combination. This also introduces a new proposal for the supply of laser beams for CNC machines, including the ability to switch between different sets of optical components and even deposition technologies automatically.
[0069] According to another aspect of the invention there is provided a machine arranged to perform removal and addition of material in a workpiece positioned in the workstation having at least one device arranged to process the workpiece, the device being arranged to be mobile in at least two geometric axes and where the workpiece is processed in a sealable chamber.
[0070] According to another aspect of the invention there is provided a machine arranged to perform removal and deposition of material on the workpiece positioned in a work station, the machine having at least one device arranged to process the workpiece, the device being arranged to be movable in at least two geometric axes and having a clean side and a dirty side and in which the deposition of material on the workpiece or processing of the workpiece is carried out in a clean environment.
[0071] According to yet another aspect of the invention there is provided a method for working on a workpiece comprising placing the workpiece in a chamber of a machine according to an aspect of the invention and processing the workpiece by removal of material, clean the chamber by removing debris from the chamber and workpiece, process the workpiece in a clean environment in the chamber, and remove the workpiece from the chamber. In some embodiments, automated means can be provided to place a workpiece on the workstation. Preferably, the automated means may comprise pick-and-place grippers. Such grippers can move the workpiece from a first position to a second position on the work platform or can move the workpiece into and out of the work area. In a preferred embodiment, grippers select and place objects, including electrical objects, to embed in parts when they are being made. The work area can be the camera or it can be the work platform.
[0072] IT and CNC can be combined so that an article can be manufactured or repaired using IT and eventually surface processed using material removal, such as CNC material removal and this process is illustrated with reference to the figure 1. It is known to use a machine that has a number of heads permanently attached to the tool and selectable for work on a workpiece. Such arrangements increase the space and volume occupied by a machining head, which restricts the machining head's operation. It is also known to move a workpiece from one workstation to another, which workstations each perform a specific operation including additive steps and post-deposition and cutting treatment.
[0073] As briefly noted above, the machine is particularly adapted to maximize the advantage of heads and heads use methods, but it will be appreciated that heads can be retrofitted to existing CNC machines to allow the use of existing CNC machines to additive manufacturing and post-deposition and cutting treatment. Consequently, there are other aspects of the invention described herein, which relate to the characteristics of the heads and the methods of use of the heads and the execution of the manufacturing methods.
[0074] According to one aspect of the invention there is provided a method for creating an article comprising at least one of the following steps: i) using a first processing head, which may have a first deposition feature, to lay material having a first property set; ii) exchanging the first processing head with a second machine head, which may have a second deposition characteristic different from the first; iii) settling additional material having a second set of properties.
[0075] According to another aspect of the invention there is provided a method for creating an article comprising at least one of the following steps: i) using a machine tool having a work station, a first processing head that can be connected to the machine -tool; a tool changer and a storage location arranged to store a number of other processing heads; ii) using the first processing head, which may have a first deposition feature, to settle material having a first set of properties; iii) exchanging the first processing head with a second processing head, which may have a second deposition characteristic different from the first; and iv)) settling additional material having a second set of properties.
[0076] Preferably, the storage location is a part of the machine, but is remote from the workstation. Preferably, any unused processing heads are stored in the remote storage location and are not connected to the machine tool when not in use.
[0077] Modalities that provide the features of the above aspect are advantageous in that they allow the type of process being performed on the article being manufactured (ie, a workpiece) to be performed in a single station, without the need to move this workpiece between stations. Thus, this aspect can be thought of as the provision of a single part or the pseudo single-part flow for the manufacturing process. It will be appreciated that an appropriate processing head is selected and moved to the workpiece. A machine tool retaining the processing head can, in at least some embodiments, automatically change the processing head from the first head to the second head, thus providing a method that can work with little or no interaction by the operator.
[0078] Preferably, the method comprises the use of a machine tool having a work station in which the article is created, a first processing head that can be connected to the machine tool; a tool changer and a storage location arranged to store a number of other processing heads. The tool changer can be arranged to remove the first processing head from the machine tool, place the first processing head in a storage location; remove a second processing head from the storage location and connect the second processing head to the machine tool.
[0079] Conveniently, the second deposition characteristic varies one or more of the following parameters when compared to the first deposition characteristic:
[0080] Angle of deposition (relative to the construction surface); type of material; mixture of materials being deposited; deposition rate; bead size; deposition cross-sectional shape; power supply; nano/micro characteristic of material (which includes hardness, ductility, chemical resistance, toughness, wear resistance, electrical and thermal conductivity, dielectric strength, or any other property of the material); color and transparency of the material; surface finish texture.
[0081] In some embodiments, the second deposition feature is arranged to improve the fidelity of the article being created to the desired article, thereby removing, or at least reducing, the need for a surface finish from the article. Modalities can improve the fidelity of at least one of an inner surface and an outer surface of the article.
[0082] Some arrangements can be arranged to deposit a sacrificial material with at least one of the first and second processing heads.
[0083] At least some arrangements are arranged to create the article in steps such that at least one of the first and second processing heads are used a plurality of times.
[0084] At least some of the embodiments use a third processing head that can be used to remove material from the article. The third processing head can be a milling head, or another machine tool.
[0085] In at least some of the embodiments, the method may include using an arranged processing head to treat the surface of the workpiece after at least a first layer of material has been deposited. The surface of a second or additional layer can also be treated.
[0086] Typically, a processing head can be connected to a spindle on the machine tool. It will be understood that the spindle is considered to be part of the machine tool.
[0087] In some embodiments, the machine tool may comprise a supply unit arranged to supply or to be able to supply a source of energy to the or each processing head. The processing head may comprise an arranged plug-in manifold connected to the supply unit to supply power to the processing head. The snap-in manifold can be arranged to be along or adjacent to the spindle. In some embodiments, the plug-in manifold can be arranged to connect along a geometric axis transverse to the spindle. In other embodiments, the plug-in manifold can be arranged to connect along a geometric axis parallel to the spindle. In other arrangements, the collector can be rotated into position. In other arrangements, the manifold can be incorporated into the spindle column, spindle housing or one of the geometry axes, conveniently to provide access to the spindle as the Z axis for many machine configurations. For example, ports on the manifold can be arranged in a pattern around the spindle collar.
[0088] The energy source can be laser energy. Each processing head can be configured to achieve a unique spatial mode and power distribution from the head. The mode can be achieved by using optical train components such as apertures, fixed or variable diffractive or reflective optical components, and auxiliary guide mechanisms, as are known in the art.
[0089] Preferably, the snap manifold is arranged to provide processing medium to the processing head in addition to, or in place of, supplying power to the processing head. The processing medium can be one or more of a metal, a plastic, polymer or ceramic material in a form of powder or a filament, cooling or processing fluids, gases and the like, including mixtures thereof.
[0090] According to another aspect of the invention there is provided a method for creating an article comprising at least one of the following steps: i) using a first processing head, having a first deposition feature, to lay material having a first set of properties; ii) exchanging the first processing head with a second processing head wherein the second processing head is arranged to analyze at least one of the article being created and a function of a processing head.
[0091] Preferably, the method further comprises using the information from the analysis to select another treatment or processing step to be performed.
[0092] Preferably, the method comprises the use of a machine tool having a workstation in which the article is created, a first processing head that can be connected to the machine tool; a tool changer and a storage location (or simply a storage location for the tools, which can be reached with the spindle, as is known in the art for changing conventional rotary cutting tools), arranged to store a number of other processing heads. The tool changer can be arranged to remove the first processing head from the machine tool, place the first processing head in a storage location; remove a second processing head from the storage location and connect the second processing head to the machine tool.
[0093] Conveniently, the second processing head is any one or more of the following: an image recording apparatus; lighting; touch probes; 3D surface and volumetric scanners; photogrammetry systems, sensors (such as oxygen sensors; thermal sensors; thermal cameras) eddy current generators, ultrasound transducers (for air, gel, and liquid-coupled), electromagnetic wave generators, induction heating coils, electromagnet(s), an amplification device, incremental sheet forming tools, flame throwers, vacuum, induction heater, galvanometer, oscilloscopes, digital mirror devices, structured light scanners, emery, abrasives, right angle variations of heads, microscopes, confocal or variable microscopes, electromagnetic detectors including gamma and X-rays, spectrographs, etc.
[0094] Preferably, the snap-in collector is arranged to supply power from the supply unit to the second processing head and to transfer data to and from the second processing head.
[0095] Advantageously a controller arranged to control the machine tool and the tool changer is provided. Preferably, the controller has a data storage component and the parameters of the processing heads are stored in the data storage component. Preferably, the controller is arranged to control the first processing head to deposit material and is then arranged to select a second processing head in dependence on the deposited material and the workpiece to be created. The controller can use Data from Analysis to select another processing head to be used.
[0096] The data from the second processing head can be used for quality control of workpiece treatment. The data can also or alternatively be used to ensure that the workpiece meets a desired quality standard. Data from the second processing head can additionally provide information about the functioning of one processing head. Such data may allow the process head calibration to be evaluated or establish that the process head may need to be replaced or repaired. According to another aspect of the invention there is provided a machine tool arranged to provide the method of at least one of the first aspect of the invention.
[0097] The machine tool can be adapted to provide a method of the invention. The machine tool can be retrofitted with processing heads and a controller and arranged to carry out one or more of the described methods.
[0098] According to another aspect of the invention there is provided a machine-readable medium containing instructions which, when read by a computer, cause the computer to execute the method of at least one aspect of the invention.
[0099] According to another aspect of the invention there is provided a method for inspecting an article being manufactured, the method comprising at least one of the following steps: i) ejecting a fluid from a first processing head onto the article being inspected; ii) coupling a second processing head via fluid to the article being inspected; and iii) transmitting a signal via the fluid to inspect the article.
[00100] In one embodiment, the first and second processing heads are the same head and the method therefore provides an efficient means to inspect an article.
[00101] The fluid may be a coolant which may be a through-spindle coolant, thus providing a method that allows a processing head to be adapted to an existing machine tool. In such embodiments, the fluid may be a machine tool coolant, arranged to be used during a material removal process.
[00102] In alternative, or additional embodiments, the fluid may be a gel or the like. Such a fluid can be thought of as a sacrificial fluid as it will later be removed from the article being inspected.
[00103] In other embodiments, the first and second processing heads are different and wherein the first processing head is arranged to deposit a sacrificial material.
[00104] According to another aspect of the invention there is provided a machine tool and/or a processing head arranged to carry out the method of the other aspect of the invention.
[00105] According to another aspect of the invention there is provided a machine-readable medium containing instructions which, when read by a computer, cause the computer to execute the method of the other aspect of the invention.
[00106] A machine-readable medium referred to in any of the above aspects of the invention may be any of the following: a CDROM; a DVD ROM / RAM (including -R/-RW or +R/+RW); a hard disk drive; a memory (including a USB drive; an SD card; a compact FLASH card or similar); a transmitted signal (including a download from the internet, ftp file transfer or the like); a metal wire; etc.
[00107] According to another aspect of the invention there is provided a method for processing a workpiece comprising: i) using a first processing head, which may have a first deposition characteristic for laying material having a first set of properties; ii) process the article being created by at least one of laser ablation, drilling, marking, coating, inspection, 3D scanning, heat treatment, hammering, scarification, shot hammering, hammering or micro-hammering, needle hammering, or lamination , the method including a plurality of processing steps performed on the workpiece. In a preferred method, a series of processes is carried out by another processing head or other processing heads. Preferably, each processing head is arranged to be optimized for a particular process.
[00108] The method includes a plurality of processing steps performed on the workpiece. The method can include two, three, four, five or more processing steps.
[00109] Preferably, at least one of the process steps comprises inspection and or analysis of the workpiece. Desirably, at least one of the other processing steps is selected using data from the workpiece analysis.
[00110] According to another aspect of the invention there is provided a processing head arranged to perform two processing steps simultaneously.
[00111] In one modality, heating and pressure treatment performed by the same head. In other modalities, alternative processes or treatments can be combined. An example list of processes that can be combined is shown below. It is emphasized that the list is exemplary and not exhaustive.
[00112] Induction heating and laser deposition of metal, such as coating or welding, etc.; induction heating and hammering; induction heating and laser processing such as heat treatment, etc.; laser heating and hammering; laser heating and lamination; laser heating and chisel work (to remove material); laser heating and pressure pins; laser material deposition and inductive spacing measurement; laser polishing (or other processing) and a camera to assess the effectiveness of the shot blasting or sandblasting process to clean/rough the surface immediately ahead of the blast shot hammering process to communicate compressive stresses in the anterior layer just after laser deposition; deposition of a degreasing agent, followed by a blow of air to prepare the surface deposition nozzle for a mineral-based flux immediately ahead of an arc-based metal deposition head (where the flux creates a slag for protect the cooling weld deposit against oxidation); blowing out air plus a laser metal deposition head; use of a camera, such as for registration in fiduciary marks with inkjet nozzles; the use of one or more cameras (visible, HD, IR, etc.) and a process to inspect the process; laser metal deposition and a detection means to identify surface and/or subsurface defects, such as by eddy current inspection; Eddy current inspection and 3D scanning (to form surface); laser metal deposition and 3D scanning; laser metal deposition and multiple cameras (photogrammetry); inkjet head and a camera; deposition of reinforcement fiber with a cutting device to cut fiber when necessary; milling and camera (for measurement); microscope(s) (confocal, stereo, etc.) and a means of illumination.
[00113] It will be further appreciated that the processing head can be arranged to perform other combinations of processes than those described above. In some embodiments, the processing head can be arranged to carry out a plurality of processes. In some modalities, the workpiece can be inspected or analyzed. In some embodiments, the processing head can also be arranged to be analyzed. Such analysis can provide a date related to the condition of the processing head.
[00114] In a preferred embodiment, heating and pressure treatment are carried out simultaneously. Preferably the pressure treatment is intermittent. In a preferred embodiment, the pressure treatment is hammering.
[00115] In some embodiments, the processing head can be arranged to be optimized to perform two processes simultaneously, such as laser coating and hot lamination. In other embodiments, the processing head is arranged to perform laser deposition (or other forms of welding, cold spraying, directed energy deposition, etc.) and hammering simultaneously. Preferably, a portion of the head having hammer pins is arranged to follow the deposition of material on the workpieces so that the deposited material is processed while it is hot. In other embodiments, a laser deposition head may incorporate a portion having rollers.
[00116] Preferably, the snap-in manifold is arranged to connect the processing head to the supply unit and to supply power and medium to the processing head.
[00117] In the modality in which laser coating and hot lamination are carried out simultaneously, the snap-in manifold is preferably arranged to connect the processing head to the supply unit to supply power for the laser coating and cooling fluid to cool the rolls in the hot rolling operation. The snap-in manifold can also be arranged to provide media for the processing head.
[00118] In a particularly preferred embodiment, the method comprises surface treatment of the workpiece by hammering. It is desirable to apply pressure to an area located over a layer or part of a layer of a workpiece to reduce layer stress. In some cases, when a layer of a material is thermally deposited, rapid cooling can cause it to be under tensile stress. It is desirable to reduce or eliminate tensile stress by applying pressure to some or all of the layer. This can be referred to as hammering or micro hammering. It can be done incrementally in order to achieve part, full coverage or repeated coverage of areas with residual stress.
[00119] In some embodiments, hammering can be achieved by indexing the processing head to follow a deposition line. In a preferred embodiment, the head can be arranged to activate one or more hammer pins to add pressure in the wake of an area treated by the processing head. Processing can be by means of a laser. Desirably, a plurality of pins can be activated. In a preferred embodiment, the activation of the pins is arranged to be cyclically opposed to a laser pulse frequency. In other embodiments, the energy sources can be an arc, an electron beam, microwaves, induction heaters, or other similar energy sources. These stress reduction techniques can be improved by choosing construction strategies that distribute the stresses in a balanced way, such as by using construction patterns (if the final desired geometry is suitable for it) that are thin-walled and symmetrical. . The parts can also be constructed imitating a seed in which the layers are not flat but are substantially spherical - essentially starting around a small core and layers growing outward (in a similar way to how a pearl grows spherical layer by spherical layer ).
[00120] In some embodiments, a processing head may be provided, in which a medium is provided to a workpiece and an energy source applies energy to the workpiece. In a preferred embodiment, the processing head can be arranged to control a direction in which energy is directed to the workpiece.
[00121] In a preferred embodiment, the power source and the medium power can be connected to the processing head via a receiving collector in the processing head. The receiving manifold can be arranged to connect to a supply manifold on a car carrying the processing head. The medium feed is preferably substantially parallel to the electrode. Such an arrangement facilitates automation.
[00122] Desirably, the power source is arranged to create a weld deposit. Preferably, the power source is an arc between the processing head and the workpieces. Alternatively, an electron beam passing through a plasma "window" can also be used. Preferably, the medium is fed directly to the solder sump. It is desirable for the processing head to comprise means arranged to control the direction of energy to the workpiece and, in a preferred embodiment, the processing head comprises means for generating an electromagnetic field. Desirably, the electromagnetic field can be controlled so that the position of the solder deposit relative to the medium supply can be controlled. To minimize variability in the characteristics of the deposited material during omnidirectional material deposition, it is desirable to allow the coaxial feed of material over the spindle centerline and position the weld deposit to effectively be on the same coaxial line.
[00123] In some embodiments, automated means may be provided to place a workpiece on the workstation. Preferably, the automated means may comprise pick-and-place grippers. Such grippers can move the workpiece from a first position to a second position on the work platform or can move the workpiece into and out of the work area. In a preferred mode, the grippers select and place objects including electrical objects for embedding in the parts when they are being made. In some case, a reservoir of components can be integrated into the pick and place heads, as illustrated in figure 40 and 41. The work area can be the chamber or it can be the work platform.
[00124] According to another aspect of the invention there is provided a machine tool arranged to carry out the steps of processing a workpiece comprising: i) using a first processing head, which may have a first deposition feature for laying material having a first set of properties; ii) process the article being created by pressure treatment.
[00125] According to another aspect of the invention there is provided a processing head arranged to apply pressure to at least a portion of a workpiece created by additive manufacturing.
[00126] According to another aspect of the invention there is provided a method for creating an article comprising at least one of the following steps of processing a workpiece comprising: i) using a first processing head, which may have a first characteristic of deposition to settle material having a first set of properties; ii) process the article being created by pressure treatment.
[00127] In some preferred embodiments, pressure treatment is intermittent. Preferably, the pressure treatment is by means of one or more impacts on the surface of the deposited material. Movement can be mechanical or it can be ultrasonic. Mechanical movement can be generated by the machine tool or by the processing head. Motion can be generated by actuating pins in the head. Pin actuation can be simultaneous or it can be sequential. Preferably, coolant fluid is supplied to the processing head to keep the pins cool.
[00128] Preferably, the head may comprise one or more rollers, at least an array of rollers, one or more notched rollers. In other embodiments, the head may comprise a pin, chisel or hammer or a plurality of pins, chisels or hammers. A power supply is preferably connected to the processing head. In some modalities, micro hammering is performed using mechanical movement. Motion can be generated on the machine tool. Preferably, mechanical movement is generated in the processing head. Alternatively, motion can be generated by ultrasound. In a particularly preferred embodiment, the processing head comprises an array of pins. The arrangement configuration can be selected in view of the workpiece geometry being de-stressed. A sequence of processing heads can be selected to fit particular geometry. This can be done by the operator based on their experience or, preferably, by an algorithm in the CAM software.
[00129] The controller can select a process head to analyze the workpiece and use analysis data to select another process head.
[00130] According to another aspect of the invention there is provided a processing head having a receiving manifold, the receiving manifold having an openable casing sealing an opening, and an actuator arranged to move the casing between a position open and one closed.
[00131] Preferably, the receiving manifold is arranged to open the casing when the receiving manifold is connected to a supply manifold. Desirably, the arrangement is such that an interior of the processing head is not exposed to the general environment.
[00132] In a preferred embodiment, an interior of the processing head may contain a laser path and the laser path is not exposed to environmental contamination in the docking/undocking process. Once the processing head has engaged and the head is securely connected to the supply manifold, a power supply for the laser path can be connected. A power supply can be a laser beam.
[00133] Preferably, the supply manifold is also provided with a second housing that can be opened and a second actuator is arranged to move the second housing between an open and a closed position. The first and second housings can be arranged to be opened together to allow connection from the supply manifold to the processing head.
[00134] As described above, the processing head can be stored and used in a clean environment and the protection of the interior and exterior of the head provided significant advantages over existing heads and head use environments. It will be appreciated that the provision of a clean connection between the processing head and the supply manifold provides significant advantages when the heads are used with existing CNC machines.
[00135] In some embodiments, the receiving manifold may be provided on the processing head and may be arranged to mate with a supply manifold in a machine in accordance with an aspect of the invention. Preferably, the receiving manifold is arranged to connect to a carriage to which the processing head is engaged with the described machine. In a conventional machine, the receiving manifold can be arranged to connect to a supply manifold provided on the machine. The receiving manifold can have an open position in which a connection to the supply manifold can be made and a closed position in which connections in the receiving manifold are protected from contamination.
[00136] The opening can be provided on one side of the processing head and arranged to connect with a corresponding side mounted opening on the supply manifold. Alternatively, as described above, particularly but not exclusively in connection with the machine, the receiving manifold can be provided on an upper face of the processing head. In some embodiments, the collector can be movable from a retracted position to a connecting position. A collapsible manifold can, in some preferred cases, be provided on one side of the processing head.
[00137] The skilled person will appreciate that a feature described in relation to any one aspect and/or embodiment of the invention may be used, MUTATIS MUTANDIS, in any other aspect/mode of the invention.
[00138] The invention will now be described in more detail, by way of example only, with reference to the attached drawings, in which figure 1 is a partial cross-sectional and perspective view of a machine according to the invention; Figure 2 is a section through the machine of Figure 1; Figure 3 is a cross section of the machine at right angles to the section of Figure 2; Figure 4 is a different sectional view of Figure 3; Figure 5 is a section through the dirty side of the machine; Figure 6 is a prior art processing head; Figure 7 is a processing head for use on the machine; Figure 8 is a detail of the processing head of Figure 7 showing the head in a closed position for storage and an open position; Figure 9 shows examples of pick and place processing heads. Figures 10a and b (prior art) show how material removal is used to effect the finishing of an article manufactured from an additive or additive manufacturing process; Figures 11a and b (prior art) show the effect of varying layer thickness on article manufacture; Figure 12 shows an example machine tool; Figure 13 (prior art) schematically shows a section through a head machine tool; and Figure 14 shows a variety of different machine tool heads; Figure 15 shows a variety of different machine tool heads with associated space and power outputs; Figure 16 shows a flowchart outlining an modality; Figures 17a to 17c show the results of the method described in Figure 16; Figure 18 shows the results of another example using the flowchart of Figure 16 with a desired different finish; Figure 19 shows an embodiment that is used to process an internal feature of a workpiece; figure 20 a and b show an embodiment using a support material; figure 21 shows another embodiment using a support material; Figure 22 shows another example of a processing head; Figure 23 shows another embodiment in which a material is used to couple the workpiece to a processing head; Figure 24 shows a cross section through a processing head for use in the method outlined in relation to Figure 23; Figures 25a to e show examples of power distributions that can be selected; Figure 26a a and show spatial power outputs obtainable; Figure 27 shows a processing head with a chisel tip; Figure 28 shows a processing head with a single pin tip for hammering; figures 29a to d show alternative pin tips for hammering; Figures 30a to e show a selection of roll tips suitable for hammering; Figure 31 shows a processing head having a tip with vertical and horizontal rollers; Figure 32 is a side view of the head of Figure 31; Figure 33 shows a variation of a processing head that has a combination of laser processing and lamination; Figure 34 shows a variation of a processing head that has a combination of laser deposition and a hammering tip; Fig. 35 is a variation of the processing heads of Fig. 34; Figure 36 is an alternative hammering head; Figure 37 is a prior art deposition head; Figure 38 is a modified deposition head; figure 39 shows the movement of the melt deposit obtained; Figure 40 is a processing head arranged to supply a number of components and in which the components are replenished through a fitting; and Fig. 41 is a processing head similar to that of Fig. 40, wherein components are stored in a reservoir in the processing head; Figure 42 shows a perspective view of a processing head having a side opening with a housing movable between an open and a closed position; Fig. 43 is a side view of the processing head of Fig. 42; Figure 44 is a schematic sectional view of a processing head for adding material; and application of pressure; Figure 45 is a schematic sectional view of an alternative head; Fig. 46 is a schematic view of a fitted laser processing head; Fig. 47 is a side view of a processing head with a laser beam supply and a sensor for feedback and monitoring; and Figure 48 is a schematic view of a modification of the head of Figure 47 to include multiple cameras.
[00139] Figure 1 shows a partial cross-sectional view and in perspective of a machine 1 according to an aspect of the invention, in which the machine is arranged to perform removal and addition of material in a workpiece 2. The workpiece. work 2 is positioned on the work station which is in a chamber 4. The machine has a first device 6 arranged to remove material from the work piece. The first device comprises a first carriage 8 arranged to move on a first support 10. The support 10 is capable of sliding over a first rail 12 and a second rail (not shown) in an x direction. Carriage 8 is movable on support 10 in a y direction. The carriage is movable in a z direction between bracket 10 and workpiece 2.
[00140] In this modality, the workstation comprises a work platform 14 which is a fixed table.
[00141] The machine comprises a second device 16 arranged to process the workpiece. The second device 16 or mechanism comprises a carriage 18 supported on a second support 20. The second support 20 is also arranged to slide over the first rail 12 and a second rail in an x direction. The second carriage 18 is adapted to move in a y direction on the second support 20.
[00142] A first and a second tool changer 22, 24 are provided. A number of first processing heads are stored in the first tool changer 22. The first processing heads are heads arranged for milling, cutting, drilling, flattening workpiece material 2. These processes are considered to be "dirty" and typically produce waste material. It is not so important to keep workpiece 2 clean during these processes.
[00143] The machine 1 is arranged so that, in use, the first carriage 8 moves adjacent to the first tool changer 22 and an appropriate processing head is selected. The processing head is moved to the snap-in position and engages with carriage 8. Carriage 8 is moved to chamber 4 and moves in the z direction to bring the first processing head into position to process the workpiece.
[00144] As can also be seen in Figure 3, a dust catch tray 26 is placed in chamber 4, below the work platform 14, to catch any residue that falls from the work piece 2. A coolant and removal fluid of waste is supplied to the workpiece through a channel in the first carriage 8. The coolant is removed from the chamber 4 through the duct system in the machine 1. The chamber has a floor 28 sloping into a connected channel 30 to the duct system. Chips or chips or other residual material falling from the workpiece can be removed from chamber 4 along channel 30 and the duct system along with the coolant material.
[00145] Once when the first processing head has finished processing the workpiece 2, the first carriage 8 moves in the z direction to remove the processing head from the workpiece. The first slide then moves in the y direction and the x direction to drive the first slide 8 to the first tool changer 22. The first processing head is detached from the first slide and moved to the first tool changer. While the first car is in use, the second car is in an inoperative position.
[00146] Preferably, the first device 6 comprises the first carriage 8, in which a plurality of interchangeable processing heads can be detachably supported, in use, and the interchangeable processing heads are storable in a first tool changer 22. The second device comprises a second carriage 18 on which a plurality of interchangeable processing heads can be detachably mounted, the removable processing heads for the second device being storable in a second tool changer 20.
[00147] Desirably, each tool changer has a number of processing heads stored in it. The first tool changer preferably stores processing heads designed to remove material from a workpiece. Such heads can be arranged to perform milling, grinding, flattening, drilling, ablation, machining and other material removal processes, as are well known in the art. Machining can be laser assisted and the processing head can use coaxial laser supply or off-axis laser supply. The second tool changer 24 stores second processing heads 32. The second processing heads 32 are used for processing and for additive processes and are maintained and used in environmentally clean conditions.
[00148] Turning now to figure 2, which shows a section through machine 1, it can be seen that work piece 2 is placed on a platform 14 inside chamber 4. The powder capture tray 26 is in a position retracted under a dust recycling extraction hood 34, from which dust can be extracted and recovered for reuse. In the stowed or recovery position, the dust capture tray is positioned on the clean side and a duct 36 from the extraction hood is positioned under the clean tool changer 24.
[00149] Figure 3 is a cross section of the machine and the section is at right angles to the section in figure 2. The powder capture tray 26 is shown in position in chamber 4 under the workpiece. The chamber 4 is provided with an inclined floor 28 leading to an extraction channel 30 at the base of the floor when the powder capture tray 26 is not in position in the chamber, chips or chips or other waste material from the workpiece 2 they fall to floor 28 and descend the slope to channel 30 at the bottom. From the channel, swarf or shavings and the like can be removed via an extraction duct 38, as will be described below.
[00150] In this embodiment, the chamber 4 is provided with an access door 40 which can be sealed to be airtight.
[00151] The platform 14 for the workpiece in the chamber is movable in 2 geometric axes A and B. It will be appreciated that the platform 14 can be arranged to move in more axes if desired.
[00152] As can be easily seen, the machine has an electrical cabinet 42 adjacent to the chamber. Electrical cabinet 42 houses the necessary connections and controls for the machine.
[00153] It will be appreciated that the workstation, or at least the work restraint device, will be electrically isolated from the rest of the machine, with a separate path to earth. Workstation insulation allows the use of an arc as a heat source without causing electrical hazard to the machine.
[00154] In one embodiment, electrical insulation is achieved using a flexible grounding strip for 3-axis machines with a table that is supported with a polymer or ceramic concrete spacer between it and the underlying machine carriages (axes) , to isolate the same. In many circumstances, on 3-axis machines, it is sufficient to have only the work restraint device isolated and grounded. However, on 5 axis geometric machines it can be more difficult and tilted rotary tables can be very difficult to insulate and ground. In a preferred embodiment, the work platform is insulated by a ceramic or polymer concrete insulator between it and the underlying carriages. Grounding is achieved by using a set of carbon brushes that surround the entire platform which is generally circular or substantially circular so that it is free to rotate continuously, but there is always a path to earth through the carbon brushes at all times around.
[00155] The first rail 12 in an upper portion of the machine can be seen together with the second rail 44 positioned opposite and parallel to the first rail. Each bracket is movable on the first and second rails. As can be easily seen, the first carriage 8 is arranged to be movable in the y direction along the first support 10. The first carriage 8 is on the "dirty" side, and is arranged to select a first processing head from the first tool changer 22 which is visible from the rear of the machine. The first and second brackets 10, 20 can slide over ball screws received on the first and second rails 12,
[00156] Figure 4 is a different sectional view from figure 3 and shows the first carriage 8 in position over workpiece 2. In this case, the first carriage 8 is in use and material is being removed from the workpiece. Work. As such, it should be expected that chips or shavings or other residual material are removed from the workpiece 2 and are present in chamber 4. To facilitate removal, the dust capture tray 26 is removed and the residual material that is removed. it detaches from the workpiece and falls to the floor 28 and is removed from chamber 4 by channel 30 and duct system 38.
[00157] Figure 5 is a section through the dirty side of the machine and shows the first tool changer 22 and a passage 46 connected to the channel 30 in the chamber 4. The passage 46 leads to an inclined duct 38 having a lifting screw. waste material 48 which can be an Archimedes screw or other known lifting screws or conveyors can be used. A motor 50 for operating the waste material lifting screw 48 is provided at an upper end of the slanted duct 38 once when waste material has been lifted to the upper end of the duct 38, it is transferred to a waste material collector 52. The transfer to the waste material collector is automatic.
[00158] Although not shown, coolant is extracted from the chamber through duct 38 and through a channel provided in the swarf lifting screw 48.
[00159] A cover is provided over the machine but is not shown for clarity, and the cover is arranged to be able to slide back to allow access to machine 1 by a crane and also to allow access for robotic handling.
[00160] Also not shown are liners that are used on the chamber and typically comprise a sealed cover or double bellows.
[00161] The machine can be built on a polymer concrete base to provide stability and robustness without undue weight.
[00162] As has been generally described, the machine can be used with processing heads that are already known and such processing heads may have been used in connection with additive production or additive manufacturing or in connection with machining by CNC. Such processing heads have been described in the applicant's previous applications, such as WO/2014/013247 and the unpublished application numbers: GB 1412843.3 and GB 1423407.4.
[00163] Figure 6 is a schematic drawing of a processing head which is a prior art processing head. It comprises a head 60 with the medium power 62 and power sources 63 supplying power to an electrode 64 which is connected to a suitable machine by a collector 66. The collector 66 is separate from the processing head 60 and it is necessary to fix the manifold to be fitted and supported by movement of the processing head.
[00164] Figure 7 is a schematic drawing of a modified and substantially unimproved processing head. The processing head comprises a head 70 which is arranged to supply power 71 to an electrode 72. The electrode creates a deposit of melt on the workpieces 73. The processing head also provides medium in the form of a filament 74 to the workpiece. work, adjacent to the melt deposit. Power and medium are supplied from a supply manifold 75 which is connected to the machine by a connection secured to a carriage 76, onto which the processing head 70 is engaged. Processing head 70 has a receiving manifold 77 which is adapted to cooperate with a supply manifold 75. Receiving manifold 77 and supply manifold 75 cooperate and are fitted together when carriage 76 captures processing head 70.
[00165] The manifold in a processing head will be described in more detail with respect to figure 8. Figure 8 schematically shows the receiving manifold 77 in a closed position in figure 8a. In this embodiment, the door 80 pivots to a closed position, as seen in Figure 8a. In this position, the connections are protected from contamination. In figure 8b, port 80 is shown in an open position and connections on the top surface 81 of the receiving manifold are accessible for connecting supply manifold 75.
[00166] Figure 46 illustrates a collector in a 460 laser processing head. A collimated laser beam 462 is provided to the 460 laser processing head through the snap-on collector interface, usually indicated at 464. socket 464 is arranged to allow a mating movement to be performed with the tool's mounting movement and the receiving socket manifold 466 has a top surface 468 which is generally oriented upward so that the top surface of the socket manifold receiving 466 contacts a lower surface 470 of the supply fitting manifold 472 when the processing head is moved into contact with a spindle in the machine, where the processing head is mounted. The collimated laser beam is directed downwards by the laser processing head and is applied to the work pieces, usually indicated at 474.
[00167] An alternative collector is described below with reference to figures 42 and 43.
[00168] Figure 9 illustrates a number of pick-and-place claws. These end tools can be attached to a processing head and can be used between processing steps to place material on the workpiece, to remove a portion from the workpiece, to add or move components. They can be particularly useful for adding components to the workpiece in part through a forming process. These are particularly helpful in increasing automation of the training process and reducing the number of personal interventions that must be made. Improved automation also allows the clean environment to be maintained and improved.
[00169] Pick-and-place grips are particularly suitable for combination with a head having a reservoir of components that can be applied to a workpiece. Sensors or inserts can be dispensed from the magazine and then placed in position on or in the workpiece by a suitable pick-and-place claw, as illustrated in figures 40 and 41.
[00170] Figures 10a and b show a portion of an article 100 being manufactured using Additive Manufacturing (IT) combined with a material removal technique. In particular, Figure 10a shows a stepped surface 102 that results from the construction or formation of the article 100 as a series of layers, as is the case in IT, where the process uses a series of layers to manufacture. The final intended surface of the article is seen in Figure 10a as a slanted dashed line 104 connecting the inner corners of the steps 102. Thus, in order to create this intended surface 104, it is then necessary to remove material from the extending article 100. beyond this intended surface 104.
[00171] Figure 10b shows the process of using, in this embodiment, a Computer Numerically Controlled machine head 106 to remove material 108 to provide the desired finished surface.
[00172] It is also possible to generate articles, or at least portions thereof, in which material does not follow the deposition steps used in IT and a brief discussion of this follows with reference to figure 11. Reference to the article here should be interpreted to mean not only the entire article, but also a portion of an article.
[00173] Figure 11 illustrates that when the depth that is seated in a single pass of the IT process, then the roughness of the finished surface increases, but the speed at which the article can be manufactured is typically increased as more material is seated in a single pass. Thus, in Figure 11a, it can be seen that the target surface 200 of the article 202 has greater steps therein compared to the target surface 204 of the article 206, as shown in Figure 11b, where less material has been seated in each process pass. of IT. Consequently, in the prior art a choice is made, unless further removal of processing material is to be used, whether the article is to be manufactured quickly by laying more material on each pass, or if a better surface finish is required, thus reducing the speed at which the article can be manufactured.
[00174] The skilled person will appreciate that, regardless of the size of step used (i.e., the amount of material seated in each pass of the IT process), it would be possible to remove material to provide the finished surface as described in relation to Figure 10. However, the amount of material, and therefore waste, and the time required to remove material, will be determined by the size of the step (i.e., the amount of material seated in each pass of the IT process) used to manufacture the article, or part of it.
[00175] Figure 12 schematically shows a machine tool 300, which typically comprises a processing head 302 held in a machine tool 300 clamping mechanism and arranged to process a workpiece 304 (such as the article 100 of Figure 10) held in a workload. Typically, the workpiece 304 is retained within the workload by an additional clamping mechanism, such as a clamping vise, or the like. In addition, machine tool 300 is usually controlled by a controller 306 (which can be thought of as a computer) which controls the position of processing head 302 as it processes workpiece 304.
[00176] Most machine tools 300 are arranged so that the processing head 302 can be exchanged for other processing heads 302, so that the correct processing head 302 is provided for the task to be performed. By providing the example of the milling machine, then a first processing head can be provided for coarse material removal, while a second processing head can be provided for fine material removal. In the case of material removal, such as milling, then the processing head can often be referred to as a machining head or milling cutter.
[00177] As such, machine tools 300 have tool changers 308, which can, typically under the control of controller 306, automatically change or exchange the processing head 302 being used by machine tool 100 to process the workpiece 304. Typically, the tool changer will also be under the control of the controller 306. In the figure shown, four other processing heads (which can be machining heads) 310, 312, 314, 316 are shown in a storage location 308, in addition to the 302 processing head which is already on the 300 machine tool.
[00178] Figure 13 illustrates a processing head 400 that connects to the machine tool 100 using the clamping mechanism 402 of the machine tool 100 and which can be stored in a processing head storage 308 (i.e., a changer of tool) and automatically connected to machine tool 100 with its tool changer. Here, the 308 tool changer can provide a storage location for processing heads, machining heads, etc. which are not currently being used by the machine tool 100. The discussion here refers to a clamping mechanism 402 and it is assumed that a spindle into which the clamping mechanism 402 connects is part of the machine tool 100.
[00179] In the embodiment being described, the processing head 400 is arranged to focus a laser beam 406 onto the workpiece 304. In other embodiments, other energy sources may be used in place of the laser. Thus, the processing head is arranged, under the control of the controller 306, to process the workpiece 304 with the focused laser beam 406 (or other energy sources).
[00180] In Figure 13, a section is shown through the processing head 400 and it can be seen that a reflector, such as a mirror 408, is arranged to move an incoming laser beam 410 by ninety degrees to be incident on a lens. focus 412 for creating the focused laser beam 406.
[00181] In addition to the laser beam and optical components, the processing head 400 also contains one or more ducts to provide a medium for example, the medium may comprise a polymer, ceramic and/or metallic powder within a fluid which is arranged to be merged by the energy sources. Processing is arranged so that the medium is supplied through the processing head and is passed to the energy sources so that it is melted or at least semi-melted before the medium reaches the workpiece 304. As such, the processing head it can be used to deposit material on the workpiece and provide a deposition system, which can, for example, be used to repair parts. Thus, the processing head can be used in an additive Manufacturing Process.
[00182] The machine tool (including a spindle) and the clamping mechanism 402 have a longitudinal geometric axis, represented by the dashed line XX in figure 13. If a machining head (such as a milling cutter) must be present inside of the clamping mechanism 402, then it would rotate around the axis XX. Conveniently, the energy sources, which, in the embodiment being described, is the laser beam 406, is focused onto a point, area, etc. 413, which lies substantially on the axis XX on the surface of the workpiece 304.
[00183] In other embodiments, the focusing lens 412 can, in fact, be arranged to cause a divergent beam, as would be the case for substrate preheating (and as illustrated by the processing head 316 in D in Figure 14 ), heat treatment of the workpiece or in some types of thermal spray or similar.
[00184] Although not shown in the drawings, some embodiments of the invention can be arranged to transmit an energy source through a machine tool spindle along the axis XX; that is, from the point region 407 shown in Figure 11. In such embodiments, the supply unit would supply medium to the processing head 400.
[00185] In other embodiments, regardless of whether the energy source is provided from region 407 or from another location, it may be preferable to deposit from a position offset from the axis XX.
[00186] Adjacent to the processing head 400 and the clamping mechanism 402 is provided a supply unit 414, which provides a housing in which various components are housed. The processing head 400 comprises a processing head fitting manifold 401 and the supply unit 414 comprising a supply fitting manifold, which are arranged to mate with one another to connect the processing unit 414 to the processing head 400 in the condition as shown in figure 13.
[00187] On top of the supply unit 414 a power source 416 is provided, which, in the embodiment being described, is a laser. Laser 416 generates a beam which is transmitted to supply unit 414 and passes through a beam expander 417 comprising a first lens and a second lens 418, 420, respectively. The beam expander 417 is used to increase the laser beam diameter in order to obtain a better final focus on the workpiece 304 and to reduce the thermal load on the optical components.
[00188] The supply unit 414 also comprises another reflector 422 arranged to reflect the light beam from the laser by 90° towards the processing head 400 and the reflector 408 therein. With reference to the beam, this can be controlled by the use of variable optical components or fixed optical components or combinations or arrangements of these optical components. Examples of the spatial distribution of the laser beam are illustrated in figure 26 a through e. An energy distribution of the laser beam can also be varied and examples are shown in figure 25a through e.
[00189] The supply unit 414 also comprises a supply of various means 424, which connects through the manifold to the processing head 400 when the supply unit 414 is connected thereto. It will be appreciated that the medium can be supplied by mating with the supply manifold of the supply unit. Alternatively, medium can be supplied from an internal reservoir or cartridge in the processing head.
[00190] In some embodiments, the medium may be a suitable powder and may be supplied from one side of the processing head through an orifice or annular supply line. The supply of powder to the workpiece can be through a side feed or preferably through coaxially directed holes or an annular coaxial outlet.
[00191] Alternatively, the medium may be provided in the form of a metallic wire or polymer filament and may be supplied from the supply unit. Metal wire can be fed along guides coaxially to the workpiece or it can be provided in multiple feeds from the processing head to the workpiece.
[00192] In some cases, the medium may be a fluid and may be a gas used for inertly shielding or shaping the workpiece. A gas can be supplied to the processing head from the supply unit. Liquid fluids can be used to cool the processing head, as will be described in more detail below. Liquids can also be used for coupling the process head to the workpiece for ultrasonic cleaning, abrasion or inspection. In some other embodiments, a liquid can be used as a means for the confinement of energy pulses, as used in laser shock hammering of the workpiece.
[00193] The skilled person will appreciate that the area 426 around the workpiece 304 is typically referred to as the working area (or volume) of the machine tool.
[00194] Figure 25 shows a variety of processing heads 310-316 that are, in the embodiment being described, retained within the 308 tool changer. The skilled person will appreciate that the particular heads that have been chosen to illustrate this embodiment are examples only and other modalities will likely use other processing and/or machining heads.
[00195] The embodiment of figure 12 can thus be used in a hybrid methodology that uses the tool changer as an automation system to allow both IT to be provided as well as material removal, inspection and the like. Such a hybrid methodology reduces the cost and complication normally associated with transferring the workpiece 304 between hitherto existing technologies by human operators, robots, or other automation solutions. There is no inherent limitation on the types of technologies, which can now be mixed and developed, including multiple additive, subtractive and inspection technologies.
[00196] The use of a 308 tool changer allows for the convenient exchange of a variety of laser processing heads - each with optimized optics, powder focus, and shielding gas for a specific task (as illustrated in relation to the head). shown in figure 13). Using a selection of different heads opens up a wider range of effective operations than is typically achieved using a single processing head. Other modalities may use processing heads that use a power source other than a laser, or that use laser-based processing heads that provide functions other than those described here.
[00197] Figure 14 shows, in more detail, the processing heads 310-316 of the modality being described. Other modalities can of course use other heads. The first 310 head is a conventional, coaxial laser coating head. The 312 second head is a laser coating head with optical components to optimize energy distribution within the laser focus for a high energy multimode laser. The third head is a laser cutting head with optimized profile and 314 high pressure/velocity inert assist gas. The fourth head 316 has a parallel or divergent focus head used for cleaning (including for removal of refrigerant residue), pre - heating, annealing, heat treatment, etc. Using this set of heads 310-316, the embodiment being described can process workpiece 304 in a variety of ways, for example, in repairing/restoring a turbine blade; any holes covered over during casing can be reopened by laser drilling in the same facility by replacing the 310-316 processing head used by machine tool 100.
[00198] Figure 15 shows in more detail the processing heads and some alternative spatial distributions and the associated power outputs that can be selected. The spatial output can be controlled by selecting the optical component in the laser processing head. Optical components can be variable or fixed. Variable optical components can be selected from free-form mirrors, galvanometer(s) and digital mirror devices.
[00199] This is an example of how hybridization increases the flexibility of current tools. Combining laser processing with in-machine inspection then forms another layer of quality assurance in the process into a system that can actually fix the problems that arise (by detecting, removing and re-add- ing material) before the parts simply become scrap. guy.
[00200] A processing head combining laser processing and inspection is illustrated in figures 47 and 48. Figure 47 illustrates a laser processing head corresponding to that described with reference to figure 13. In this embodiment, the processing head 4700 is provided with a second processing function in the form of a 4702 camera or sensor. Although the use of cameras positioned to view the melt deposit is known in the art, the ability to introduce a camera into the work area to augment one or more melt heads deposition via plug-in manifold provides the ability to monitor via heads that are accessible as such and to be safely removed from the work area when it is not in use. Camera 4702 is provided adjacent to the feed for laser beam 4704. Laser beam 4704 is directed to a partial reflector 4706 which directs the beam of laser energy in the direction towards the axis of the spindle. The 4706 partial reflector allows coaxial viewing through the reflector.
[00201] A second 4708 reflector is provided and this allows the camera a coaxial line of sight in the laser beam supply. The camera is designed to provide process feedback and workpiece monitoring and can be adapted to provide process feedback on the functioning of the laser processing head.
[00202] It will be appreciated that the camera could be mounted without using the second reflector by mounting the camera with a direct line of sight to the partial reflector. Optionally, multiple cameras can be used to monitor different spectra. It will be appreciated that it is recommended to mount alternative sensors on the head to monitor other data from the workpiece or from the head, as is schematically illustrated in Figure 48. A first 4702 camera is mounted adjacent to the laser beam feed and has a line of sight coaxial to the laser beam by reflector 4708 and a partial reflector 4706. A second camera 4710 is mounted adjacent to the first camera 4702. A second reflector 4712 provides a coaxial line of sight from the second camera for feeding the laser beam. laser. Some embodiments of the invention can be arranged to deposit dissimilar materials onto the workpiece 304, perhaps by providing a different processing head for each material.
[00203] Thus, an example of how the modality being described can be used is described in relation to the flowchart of figure 16.
[00204] As a first step 600, machine tool 300 is arranged to select a first processing head 312 (a laser coating head) by tool changer 308. This head is similar to that depicted in figure 13 and arranged to deposit material (in this case metal) onto a workpiece 304.
[00205] The controller 306 is programmed, as is known in the art, to control the machine tool 300 and the processing head 312 to deposit material (step 602) to manufacture the desired article. The skilled person will appreciate that the techniques described here will be appropriate for creating entire articles or modifying existing articles. Modifying an existing article will include repairing that article.
[00206] As described with respect to figures 10 and 11 above, the material deposited by the processing head 312 is formed into layers that lead to evident steps on the outer surface of the workpiece 306. Such steps will also occur on any inner surfaces.
Consequently, at a predetermined point in the program executed by the controller 306, the machine tool is arranged to engage the processing head 312 back to the tool changer 308 (step 604). The skilled person will appreciate that the predetermined point will be determined by the program. In some embodiments, the predetermined point may be when most of the material for the article being manufactured has been deposited. In other embodiments, the deposition of material to the article can take place in an iterative manner: that is, some material is deposited, processing heads changed; other processing performed; Returned deposition head and additional deposited material and such a material flow is described in relation to Figure 19.
[00208] The controller 306 then makes the machine tool select a second processing head (step 606), which, in this example, is the processing head 310. Looking at figure 14, it can be seen that the area over which the laser beam is focused from the processing head 310 is smaller than the area for the processing head 312. As such, the processing head 310 will deposit material in smaller amounts compared to the processing head 312. Thus, the processing head 310 can then be controlled to deposit material in finer amounts (step 608).
[00209] The controller has a data storage component which is arranged to store information about the parameters of the processing heads at the storage location and is arranged to select an appropriate processing head based on the desired item.
[00210] In addition, the controller can select an adapted processing head to inspect or analyze the workpiece. The controller is arranged to select an appropriate processing head for further processing depending on the analysis head data.
[00211] Figure 17 shows how layers 700a-d deposited by head 312 are of a greater thickness than layers 702a-c deposited by head 310. For example, process step 602 may have been used to deposit the layers 700 and process step 604 may have been used to deposit layers 702. The skilled person will appreciate that although Figure 16 shows only a single change of processing heads, other modalities may provide multiple processing head changes in order to work on the workpiece. Each selected sequential processing head can be controlled by the controller using information from an inspection or analysis head and depending on the workpiece to be created.
[00212] However, it will also be seen that the head 310 was used to fill the stepped nature of the surface portion 704 (ie, the workpiece) being manufactured. Thus, the surface of the part becomes a closer approximation to the desired surface 706 and the second processing head used in step 606 was used to improve the fidelity of the article being created to the desired article, thus removing, or at least reducing, the need for a surface finish of the article. Depending on the characteristics of the other heads, a higher fidelity to the intended surface can be obtained, as shown in figures 17b and 17c.
[00213] Figure 17b illustrates an embodiment in which the second processing head allows the material 710a-e to be deposited with sufficient resolution that the final, desired surface 706 can be substantially obtained without the need for further processing.
[00214] Figure 17c shows an embodiment in which a liquid was deposited by the second processing head, and due to the surface tension within this liquid (before solidification), the deposited and solidified material 712a-e forms slightly extending convex surfaces in addition to the desired end surface 706.
[00215] Once when processing head 310 was used to deposit the smallest amounts of material in layers 702a-c; 710a-e; 712a-e, then the surface can have an acceptable surface finish. If this is not the case then other processing and/or machining heads can be used to further work the workpiece, eg smaller amounts of material could be deposited within the remaining steps (eg 708) between layers 700 and 702 to make the surface a closer approximation to the desired surface 706.
[00216] In alternative, or additional embodiments, a milling head, or similar, can be selected to remove material to provide the desired surface. It will be appreciated that, in such embodiments, less material will need to be removed compared to embodiments in which layers of material 702a-c have not been deposited by processing head 310. Thus, it will be appreciated that the embodiments providing the method as outlined in relation Figure 17 provides a surface finish which is either i) acceptable without any removal of material; or 2) requires much less material removal to provide the finished surface compared to an embodiment in which layers 702a-c have not been deposited. In the example of Figure 17, the material being deposited in layers 700 and 702 is largely the same, but with the rate/amount of material deposition being varied between layers 700 and 702.
[00217] Figure 18 is used to exemplify another example of Figure 16, in which the material is varied between steps 602 and 606. It will be appreciated that it would also be possible to vary the rate/amount of material being deposited in addition to varying the composition of said material.
[00218] As in figure 17, process step 602 is used to deposit the layers 700a-d and step 604 is used to change the processing head.
[00219] In step 606, the second processing head is used to deposit a material having a different property in the 800a-d layers compared to the 700a-d layers. The skilled person will appreciate that although layers 800a-d are shown in this embodiment as being on the faces of layers 700a-d, this need not be the case.
[00220] In the embodiment of figure 18, the different property is provided by a different microstructure of the material, specifically, the material deposited in layers 800a-d has a different heat treatment, although it could be substantially the same material as that in layers 700a- d, and therefore has a different hardness, for example, layers 800a-d can constitute a hardened support surface, cylinder sleeve and the like. Those trained in the art will appreciate that by varying processing parameters, including power feed, raw materials, additives, shielding, that a wide variety of nano and micro properties can be varied, including grain size, crystal structure, crystal orientation, and chemistry, which have corresponding effects on hardness, chemical resistance, magnetism, residual stress, dimensional stability, thermal conductivity, electrical conductivity, etc.
[00221] In other embodiments, it is possible to exchange the material between steps 602 and 606, for example, step 602 can be used to deposit a metal and step 606 can be used to deposit a plastic. In other embodiments, similar to that shown in Figure 18, layers 800a-d may not be provided by additional material and may simply be provided by a heat treatment on a surface region of layers 700a-d. Such surface region treatment may be provided by a heat source such as a laser or the like. An alternative treatment will be described in more detail below.
[00222] Thus, figure 18 is used to exemplify modalities in which step 606 is used to deposit materials of different properties (either a bulky structure or a nano/microstructure) compared to the material deposited in step 602.
[00223] Figure 19 is used to exemplify another example of the process outlined in relation to Figure 16. Here, a first processing head is used to deposit a series of substantially annular layers 900a-d. Each of the layers is shown and thus the interface between each of the layers is visible in the figure. The skilled person will appreciate that this interface between the 900a-d layers will be present both on the outer side of the ring of each layer and also on the inner side of each layer.
[00224] Here, the second processing head used in step 606 is a material removal head, such as a milling machine, or similar. However, material removal is not only used to smooth the outer surface of the layers, as shown at 902, but also to smooth the inner side of the ring, in a similar manner.
[00225] In other embodiments, additional material may be deposited using a second processing head in order to improve the fidelity of the inner surface of the article being created for the desired article in a manner similar to that described in relation to the outer surface in Figure 17.
[00226] As such, the skilled person will appreciate that, in such an embodiment, the number of layers deposited using the first processing head in step 602 is limited to the extent to which the second processing head used in step 606 can reach far enough inside workpiece 902.
[00227] However, by using both the first and second processing heads a plurality of times, thus creating the stepped article, it is possible to build larger workpieces that have a smoothed inner surface.
[00228] Thus, in the example of Figure 19, it can be seen that, once when the second processing head has been finished with in step 606, the first processing head is again used so that another four layers 904a-d are deposited on the top of workpiece 902. Then, the second processing head is again used in step 606 and both the inner and outer surfaces of the new layers 904a-d are processed to generate workpiece 906.
[00229] Modalities in which the inner surfaces are smoothed in this manner may find utility in applications where a gas, a liquid, or other fluid or fluidized material flows through the workpiece 906, as it will be appreciated that the surface smooth internal can lead to better fluid flow. Examples where a structure can be useful include fuel lines, hydraulic lines, cooling channels, flow tubes, or the like.
[00230] The skilled person will also appreciate that it would be possible to provide other processing head changes, in order to provide a macro or micro material change around the inner surface region of each of the layers 900a-d, 904a-d, etc. Additionally, a substantially smoother internal surface can be achieved by using different sized deposition heads, without machining, which is considered more appropriate.
[00231] Figure 20 is used to explain another example of how the process of Figure 16 could be used.
[00232] In step 602, a first material is deposited. In the example of figure 20a, the material is deposited as half a cylinder 1000 on a first material. This cylinder 1000 will be a sacrificial material as described hereafter. In the second processing step, an additional material 1002 is deposited on the sacrificial material 1000. Thus, the sacrificial material 1000 supports the arc 1004 so that the arc 1004 can be manufactured and thus the sacrifice material 1000 provides support for material deposited in future processing steps. Once the second processing head has finished and the additional material 1002 has solidified, etc., the sacrifice material 1000 can be removed. The skilled person will appreciate that further processing steps can be completed before the sacrifice material 1000 is removed.
[00233] In such embodiments, the material portion 1002 may be any material suitable to act as a support. However, the portion of material 1002, which can be thought of as a support material, may typically be a soluble polymer material or a loosely bound/confined particulate or powder. It can be on a solid part filling the empty space or it can be created as a hollow self-supporting structure according to known limitations in the art of directed energy deposition. For example, a support structure could be made in a shape that resembles a cathedral with arches. It could also be made in such a way that it is easily removable by machining.
[00234] Figure 21 provides another example in which a supporting or sacrificial material is deposited to facilitate fabrication or repair of the underlying article. Here, the article being manufactured is a turbine blade 1100. In a lower portion of the turbine blade there is a serrated blade root portion 1102 which is difficult to retain during the manufacturing steps.
[00235] As such, some arrangements are arranged to envelop this serrated blade root portion 1102 within a sacrificial material block 1104 (shown here, with dashed outline). This sacrificial material 1104 could then be fixed in order to retain the turbine blade 1100 during subsequent steps. Thus, sacrifice material 1104 provides a temporary sacrifice material that aids in the physical positioning of the workpiece.
[00236] It will be appreciated that components may benefit from being supported at more than one point. Thus, in the context of Figure 21, one embodiment provides another portion of sacrificial material 1106 in the direction towards the end region, opposite the serrated blade root portion 1102. This other portion 1106 allows the blade 1100 to be held in two. points in the regions of the sacrificial material 1104, 1106 and that the blade 1100 is protected from damage by the fastening means (such as a clamping vise, or the like).
[00237] The skilled person will appreciate that although the example of a turbine blade was used, any other part could be so treated.
[00238] In some embodiments, a processing head can be used to provide a protective material arranged to protect a surface region of the workpiece. As with the support material, the protective material may (or may not) be a sacrificial material that is removed later in the manufacture of the article.
[00239] In still other embodiments, as briefly noted above, a processing head can be used to inspect an article. In such embodiments, the processing head may comprise any one or more of the following: image recording apparatus; lighting; touch probes; 3D surface and volumetric scanners; photogrammetry systems, sensors (such as oxygen sensors; thermal sensors; thermal cameras); eddy current generators; ultrasound transducers (for air, gel, and liquid-coupled); electromagnetic wave generators or similar. Inspection data can be transferred from the processing head to the controller and from the controller to the processing head to control inspection.
Thus, it will be seen from the foregoing that embodiments of the invention provide for a variety of processing steps that can be applied to a workpiece. The skilled person will appreciate that a feature described in relation to any one modality can be used, MUTATIS MUTANDIS, with any of the other described modalities.
[00241] Some modalities can wash a processing head. Such modalities are advantageous because they help to ensure that the processing head is clean for its next use and help to prevent material contamination. In addition, such modalities help prevent wear on components through material particles left within and/or in a processing head. In particular, in the embodiment being described, when a processing head is returned to the tool changer 308 it is washed or cleaned with compressed air. In other embodiments, other gases (eg an inert gas such as nitrogen or similar) could be used.
[00242] In a particular embodiment, it comprises four material feeds from the supply unit 414 to the processing head 400. Other modes may have fewer or more material feeds, used one at a time or in combination to provide production alloys in the process. However, four feeds can be used to provide flexibility in how material is supplied from the supply unit 414 to the processing head 400 and can be used to improve the speed with which a material change can be made and also to reduce the chances of contamination.
[00243] In one example, material of a first type can be fed to the processing head 400 using two feeds. Then, it is desired to change the materials and so the material flow is stopped, or at least diverted, using a bypass circuit, away from the processing head 400. In the embodiment being described it has been found to be advantageous to divert material back to a hopper so that it is not wasted, thus collecting means that it is washed or cleaned / diverted from the processing head. Here, the bypass, rather than stopping the feed, is useful to ensure that pressures within the material feed are not raised too strongly.
[00244] Once the first material has been diverted (i.e. prevented or stopped from entering the processing head), the processing head is washed or air-cleaned and subsequently the two feeds not previously used are now used to provide a second material for the processing head. Such a modality is advantageous as it allows the material supplied to be switched from the first material to the second material quickly without the need to change the processing heads 400 or change the supply units 414, while ensuring that contamination of the materials does not occur. .
[00245] Various actions can be taken to assist in changing from a first processing head to a second processing head.
[00246] In addition, and in the modality being described, parameters associated with the processing head to be used are loaded, for use, to the controller 306. Thus, with reference to Figure 16, then as the first processing head is switched to the second processing head, then at some point during the changeover between the two heads, parameters associated with the second processing head are loaded, for use, to the 306 controller.
[00247] A wide variety of processing parameters are stored for each deposition head including energies, feed rates, gas flows, etc. and exchange rates for each of these triggered by geometric requirements. These settings can be stored in database tables in a separate controller and recalled when needed, or they can be fully integrated into a machine tool controller and recalled using custom M codes or other appropriate signals. In some cases, the parameters for the deposition heads can be used with functionality in the controller already associated with conventional cutting tools, such as offsets. Modalities can reuse parameters stored in relation to machining heads (for example, a milling head or similar) to allow those parameters to be used with non-machining processing heads (such as deposition heads, probe heads and the like) . For example, at least one of the following parameters can be stored for a processing head:
[00248] Tool length offset for each processing head length. Typically, tool length is measured along what would be termed the Z axis, which, in the embodiment described with reference to Figure 13, is along line XX. It will be appreciated that most machine tools 300 have a parameter, often called a G code, used to set the origin to the measured and stored length of a drill, or other material remover. This parameter can be used to store the length of the processing head. Modalities that store the length of the process head are advantageous in that they can reduce the chances of the process head having a collision with the workpiece 304. The modalities can adjust the origin for the process head to allow the processing head is moved between a plurality of workloads on the same machine tool 300. This parameter allows adjustment to be made to the origin of machine tool 300 to shift the reference point for fixtures on the table, such as like when there are two clamping lathes on the CNC table (eg two workloads). In the modality being described, the parameters are used to record any deviations from the centerline (fine tuning to arrange all the processing heads to be used by machine tool 300 over the centerline and/or, in some cases, for a desired displacement).
[00249] Offset clamping equipment can be used to make fine adjustments to ensure that the head position is maintained substantially over the centerline of the spindle, or to specify intentional offsets from said centerline. These displacements would typically be referred to as being on the X or Y geometric axis, which, in the modality described in relation to Figure 13, would be perpendicular to the XX line.
[00250] In some embodiments, including the one being described, the length of the stored tool can be modified or compensated so that the length of the processing head is increased beyond its physical length to include the projected offset distance of the processing head. processing from the forming surface (i.e., workpiece surface 304). Here, the standoff distance is the required distance between the process head and workpiece 304 and can be adjusted to handle the deposition width.
[00251] In this mode, the controller 306 is arranged to vary the offset distance, and therefore to vary the stored length of the processing head, in order to vary the distribution of the laser energy beam that is communicated over the workpiece 304. The skilled person will appreciate that when the laser is moved towards, or away from, the workpiece, then it will then move into or out of the nominally projected focus. Consequently, the use of a length of the processing head that includes the take-off distance can allow the focusing of any energy sources provided by the processing head, which, in the embodiment being described, is the laser.
[00252] Some embodiments may measure the amount of laser back reflection from the surface of the workpiece 304 and aim to minimize this amount; as such, the process head is arranged to measure energy returned from the workpiece from the energy directed (ie, the laser) from the process head toward the workpiece. It will be appreciated that once a laser is focused then maximum energy will be coupled to the workpiece 304 and that therefore the amount of laser light reflected from the surface will be minimal. This process of determining the ideal focus can be a stored routine, which moves the head through a range of distances to establish the ideal focus and then the optimized result of the process can be stored in the CNC tool length tables as described. above, or otherwise.
[00253] In addition, any processing head, in which the deposition or processing point is not on the spindle centerline, can be stored as a fixture offset and retrieved when the head is loaded into the spindle, thus reusing another standard CNC feature to accommodate the use of multiple heads.
[00254] Also, the modalities can store other parameters for a processing head. For example, parameters can be stored which determine the flow of any medium 424, flow of any shielding gas, or the like; determine the energy of any energy sources (such as laser 416). The parameters mentioned in this paragraph may indicate how they should be varied according to the movement of the processing head, for example, it will be appreciated that when a processing head approaches by a turn within its path then it is likely that it will need to downgrade the speed in order to get this lap. Consequently, when the processing head slows down, it becomes advantageous for the modalities to reduce the flow of medium 424; reduce shielding gas flow; and reduce energy from any energy sources (eg laser 416).
[00255] Some modalities may use a 1200 processing head that uses mechanical means, such as a 1202 syringe or one or more Archimedean screws (not shown), to eject or extrude 1204 material from the 1200 head. Such modalities can work with a material feed from supply unit 414 or may additionally supply medium from a reservoir within processing head 1206.
[00256] Some embodiments can use spindle rotation (of the machine tool) to directly control the amount of extruded material. For example, in the processing head 1200 of the figure being described, which uses a syringe-based deposition, the plunger or other means to cause displacement in the syringe 1202 is coupled to the spindle with the tool holder and thus commands to control movement of the spindle changes the offset that controls the deposition rate. In one embodiment, one or two Archimedes screws are present which are arranged to interact to plasticize a material (typically by shearing the material after in known manner in injection molding), typically a polymer, within the processing head. The energy to turn the screws can come directly from the spindle rotation. A heater can additionally be provided in order to assist the plasticization of the material. The heater can be powered by electricity generated from the movement of the spindle.
[00257] In one embodiment, the processing head is arranged to detect the spindle speed of the machine tool to which it is attached and use that spindle speed to control mechanical means within the head, for example, a transition of a first rotation speed to a second rotation speed may indicate that the flow should start. A transition from high speed to low speed may indicate that the flow should cease.
[00258] Other modalities can use other rotation speeds in order to pass additional information to the processing head.
[00259] Figure 23 illustrates another embodiment in which a processing head 1300 is positioned above an article being inspected 1302. This article may still be in the manufacturing process and an inspection step may be performed as part of the process described in relation to any of the above figures. Item 1302 could also be a finished item to be inspected.
[00260] Figure 23 shows a fluid 1304 being ejected from the processing head 1300 and impacting a surface of the article 1302. In the embodiment of figure 23, the fluid is a cooling fluid typically used by the machine tool in the which processing head is supported to cool an article being milled, drilled, or similarly processed. Thus, it will be seen, as illustrated in the figure, that the fluid bounces away 1306 from the surface 1302. To facilitate communication of the cooling fluid to the article, a channel 1308 is provided along a central region of the processing head. 1300. The channel is arranged to ensure that fluid 1304, as far as possible, has laminar flow, as turbulence within the fluid flow can reduce coupling to article 1302.
[00261] In some embodiments, fluid 1304 is refrigerant through the spindle.
[00262] Nevertheless, fluid 1304 provides sufficient coupling for an ultrasound transducer 1310 provided within channel 1308 and in communication with fluid 1304 flowing therein for ultrasound transmitted by transducer 1310 to be coupled to article 1302.
[00263] Thus, the modalities as described in relation to Figure 23 can be used to inspect articles 1302 using ultrasound. The expert will appreciate that such inspection may be helpful in determining the presence of voids and the like within Article 1302.
[00264] In other embodiments, the fluid can be deposited on the surface and later used by a processing head to couple this processing head apart to make an inspection, such as an ultrasonic inspection, using this fluid as a coupling means. When a CNC machine is equipped with flood refrigerant capacity and the refrigerant is sufficiently clean, it is desirable to use it as the coupling means, however, when it is not fit for purpose, other fluid may be supplied. The processing head carrying out the inspection can be the same or different from the processing head that deposits the fluid. Here, the fluid can be a gel or the like. The gel can be termed a sacrificial material as it does not remain in the final article and is used as part of an inspection process.
[00265] An alternative processing head 1700 is shown in Figure 27 having the 1702 in the form of a chisel. A workpiece surface can be treated with the chisel tip to reduce stress on the workpiece or a part of the workpiece. The chisel tip can be kept stationary or it can be moved by the movement of the spindle. Alternatively, they can be actuated by mechanical or ultrasonic means that can be provided inside the processing head. In Figure 28, the processing head 1800 has a tip in the form of a pin 1802. The pin can be used to relieve stress and deformation, particularly tensile stress, in the workpiece. Alternative configurations of the tip of a processing head are shown in figures 29a to 29d. The tip can have one, two, three or more pins. Pin arrangements can be used, as seen in figures 29c and 29d. The controller can choose a head with a particular pin arrangement to apply pressure to the required part of the workpiece and the selected arrangement is appropriate to the workpiece geometry. Alternatively, head selection can be predetermined using planning software ahead of time, such as with CAM software.
[00266] In figures 29a to 29d the pins have a circular cross section, but the skilled person will appreciate that the pins may alternatively have rectangular, hexagonal, square or other cross sections. Such cross sections can be used if an arrangement is required, in which there are no gaps or overlaps. The processing head is actuated to impact or apply pressure to the workpiece. This process is referred to as hammering. Pressurized hammering relieves tensile stresses and applies compressive stresses to workpieces thereby improving workpiece characteristics. The force results in material compression, which, in many materials, contributes to better fatigue life and is less susceptible to crack propagation, with better resistance to stress corrosion, corrosion fatigue, and cavitation erosion. It will be appreciated that a person skilled in the art will see the hammering method shown in these illustrations as interchangeable with all varieties of hammering including shot blasting, hammering, mallet (roto), vibro, hammer, point, needle, ultrasonic, micro, nano, and laser shock hammering.
[00267] Alternative heads that can be used for ultrasonic needling or hammering the surface of the workpieces are shown in figures 30a to 30e. Figure 30a shows a head having a continuous wheel or roller and can be caused to apply continuous pressure. The discontinuous roller in figures 30b and 30c can be used to apply pressure intermittently and may be preferred to reduce the required rigidity of the machine tool. It is desirable that the machine tool or processing head be provided with a force feedback mechanism to apply a desired amount of pressure to the workpieces, which can be recorded and used in a metrology link that monitors the feedback (including gradients force and temperature of the workpiece) and adjusts the process optimally in real-time to ensure consistent treatment of each workpiece.
[00268] Figures 30d and 30e show variations in which an arrangement of wheels or rollers is used. The skilled person will appreciate that the rollers can be arranged to have individual tracks so that the rollers can conform to a surface on which they travel.
[00269] Figure 31 shows an embodiment in which the processing head comprises sets of roll arrangements. A pair of arrays are arranged to rotate about an axis parallel to the spindle and an array of rollers is arranged to rotate about an axis perpendicular to the axis of the spindle. As can be seen, the rollers are arranged to act on a top surface and side surfaces of a wall wall created in the workpiece.
[00270] In figure 32 is a side view of the processing head, if figure 31, in which the set of rollers arranged to rotate around the geometric axis of the spindle can be seen more clearly.
[00271] Figures 33 to 34 show variations of the mode of figure 13 and the same reference numbers were used for the same features. In figure 33, a roller is combined with a laser coating head. This allows the material to be hot rolled immediately after deposition onto the workpiece. Hot rolling of the workpiece can have benefits to the microstructure of the deposited material and can also reduce the amount of force required to affect material properties. As noted above, the manifold and processing head are arranged to supply a coolant to the internal passages in the head and to the wheels or rollers to prevent overheating. The roller is indexed around the spindle to ensure that the rolling action is substantially parallel to the deposition direction.
[00272] Figure 34 shows a processing head that has a laser deposition head and hammering pins integrated around the head. This arrangement allows for hot hammering, hammering, scarifying, and chiseling of the workpiece. As before, coolant is supplied to the processing head and is circulated around the head to keep the pins cool. Hammering is accomplished by impacting the surface of the part that is hot, similar to using a Blacksmith hammer, and the impact of the pins on the head metal in a softened state is maximized while the force is reduced in comparison. with cold hammering. The action of the pins is mechanical and is controlled by the processing head, but alternatives such as providing the action by the machine tool or using ultrasound can be contemplated. As with the previous head, it can be circumferentially indexed to add pressure to the wake of the area heated by the laser. The pins can be fixed so that they can be displaced with a couple of mm of displacement, once the proper force has been exerted by them. To allow for some head displacement, pin actuation can be cyclically counteracting a laser pulse frequency so as not to blur the laser if the pin movement is dependent on the Z axis of the CNC machine. It will also be appreciated that a laser heat source has been shown here, as an example, but an arc, electron beam, microwave, induction heater, or similar could also be used.
[00273] When forces are high and especially when forces are not substantially symmetrical around the centerline of the spindle, it is desirable to have anti-rotation/torque blocks and/or push assistance collars and/or cover brackets for the spindle , as is known in the art to assist heads at 90 degrees or other angles. In some cases, it will be desirable to rotate the spindle when subjected to pressure, impact, or stress relief operations to help prevent the bearing surfaces from being damaged (such as by wrinkling) due to non-uniform loads.
[00274] It will be appreciated that the hammer heads described above can be used independently of the laser laser heads. Hammering is then performed on the workpiece when it is cool or at least not so hot.
[00275] Figure 35 is a variation of the processing head of Figure 34 and has a processing head that has a laser deposition head and hammering pins. The same reference numbers are used for the same characteristics. The head is shown in more detail in figure 36. As in the head in figure 34, the hammer pins are integrated around the head. However, in the head of figure 34, the head is circumferentially indexed to follow a deposition line, in this head different pins can be activated in order to add pressure in the wake of an area heated by the laser. Activation can be by actuation of the hammer pins or by increasing the length of individual pins so that they contact the surface before the other pins. In another arrangement, the pins are attached to the processing head so that they can be displaced by a few mm of displacement, once an appropriate force has been exerted on the pins. It has been found desirable to make the pin actuation cyclically counter to a laser pulse frequency, which prevents laser defocusing, that pin movement is dependent on the Z axis of the CNC machine. It will be appreciated that energy sources can be exchanged for alternative energy sources, such as an arc, an electron beam, microwave, induction heaters, or other equivalent energy sources.
[00276] Figures 44 and 45 show alternative processing heads, adapted to perform two processes. The heads in figures 44 and 45 apply a polymer extrusion to a workpiece. In Fig. 44, the processing head comprises a polymer extrusion head 4400 affixed to the tool holder 4402. The extrusion head comprises a body 4404 and a nozzle 4406. The nozzle 4406 is surrounded by a compaction frame 4408. Heaters 4410. are positioned around the 4404 body of the extrusion head. A screw 4412 connected to tool holder 4402 rotates within a bore 4414 of the head to move injection molding pellets 4416 from the 4418 medium feed toward the nozzle. As pellets move down bore 4414, the pellets are heat melted by heaters 4410 around the body. When the granules melt, the screw 4412, which is driven by the spindle, plasticizes the granular material ready for extrusion from the nozzle. When material is being extruded from the nozzle 4406, the compaction frame 4408 alternately moves up and down, applying pressure on the soft material 4420 to obtain the full density of the extruded material.
[00277] Figure 45 illustrates a modification of the head of figure 44. The same reference numbers are used for the same features. In Figure 45, an additional feature is that a continuous fiber 4422 is fed to the head in a coaxial direction. Fiber 4422 is fed through the molten polymer and is extruded through nozzle 4406 with extruded polymer 4420. A knife 4424 is provided which operates to cut the fiber periodically once it has been extruded. The knife can cut the fiber when it is finished with each continuous feed. In other embodiments, the fiber is periodically ground to produce a ground fiber reinforcement of the extruded material.
[00278] It will be appreciated that, in an alternative arrangement, the polymer and fiber could be fed from separate nozzles on the same head or could be applied by different heads with the processing heads being switched between the deposition steps.
[00279] The skilled person will also appreciate that the screw does not need to be connected to the tool holder, but can be placed in the receiving socket or even in the supply socket. The polymer can be melted in the machine tool and merely fed to the process head via a heated tube connected or connectable to the process head body.
[00280] Figure 37 shows a prior art processing deposition head, in which an electrode 3701 supplies power to the workpiece 3702 and a metallic wire 3703 is fed into the melt tank 3704. Typically, this is done exactly at the front of the electrode, since feeding the metallic wire in front of the electrode prevents the metallic wire from sticking to the substrate. The area generally indicated at 3705 is the thinning layer and hot affected zone.
[00281] Figure 38 shows a new deposition head comprising an electrode 3801 that provides power to a workpiece 3802 and a medium supply 3803. The head comprises means for generating an integral electromagnetic field 3804 that is arranged to bend an arc 3805 extending between the electrode and the workpiece.
[00282] The 3804 electromagnetic field bends the 3805 arc to be slightly ahead of the 3801 electrode. The feed of the 3803 medium in the form of a metallic wire can be fed substantially parallel to the electrode thus facilitating automation. Metal wire is always fed straight into the 3806 melt tank and is unaffected by changes in feed direction. If necessary, arc bending can be controlled by changing the electromagnetic field applied to the arc. The 3804 electromagnetic field can be controlled by changing the mode of electricity used to induce the field, or it can be changed by controlling the position of the magnet or magnets.
[00283] Figure 39 illustrates the control that can be achieved at the melt deposit location using the head of figure 38. The electrode position has not changed, but the polarity of the field energizing the electromagnet has been reversed. In this case, the melt deposit location was moved by approximately 10 mm. The displacement of the solder deposit allows the metallic wire to be coaxially fed to the electrode. It will be appreciated that the bow may intentionally be moved to an alternative position, other than the coaxial placement of the wire wire, if so desired.
[00284] Figures 40 and 41 illustrate processing heads 4001 that can hold multiple components 4002. In figure 41, components 4002 are retained within processing head 4001 in a reservoir or storage equipment 4004 and the head 4001 is arranged to dispense 4002 components when required. In the embodiment of Fig. 41, the processing head 4001 can be replenished through a socket 4006, as schematically indicated at 4008.
[00285] Figure 42 illustrates an alternative processing head that has a body 4600 and a nozzle 4602. The processing head can be connected to the carriage and has a receiving manifold 4604 positioned on a side face 4606 of the body. The receiving manifold 4604 comprises an opening 4608 having a housing 4610 arranged to be movable in a track 4612 between a closed position in which the housing is over the opening and an open position 4614, as seen in Figures 42 and 43. actuator, not visible, is arranged to move the casing from the closed position to the open position in the snapping operation and to move the casing from the open position to the closed position in the undocking operation. In the closed position, the interior of the processing head is sealed from the environment. In the open position, the socket of power and media supplies can be arranged through the opening. In the docked position, the path for the power supply and a half through the opening and to the processing head is sealed from the environment.
[00286] It will be appreciated that a number of different concepts have been described here. The skilled person will appreciate that these can be used alone or in combination with the other concepts described here.

权利要求:
Claims (32)
[0001]
1. Machine tool adapted and arranged to perform removal and addition of material on a workpiece positioned at a work station, the machine tool characterized by the fact that it has a first head arranged to remove material from the workpiece and at least one second head arranged to process the workpiece, each of the first and second heads being arranged to be movable in at least two geometric axes and wherein the machine is arranged to control a workstation environment.
[0002]
2. Machine tool according to claim 1, characterized in that the machine comprises a clean side and a dirty side.
[0003]
3. Machine tool according to claim 1 or 2, characterized in that the first head is selectable from a plurality of interchangeable first processing heads and the second head is selectable from a plurality of second processing heads. interchangeable processing and where the first interchangeable processing heads are storable in a first tool changer and the second interchangeable processing heads are storable in a second tool changer.
[0004]
4. Machine tool according to claim 3, characterized in that the first and second tool changers are remote from the workstation.
[0005]
5. Machine tool according to claim 3 or 4, characterized in that the first tool changer stores process heads designed to remove material from a workpiece, and the second tool changer stores designed processing heads and arranged to process material into a workpiece.
[0006]
6. Machine tool according to any one of claims 3 to 5, characterized in that the plurality of interchangeable second processing heads is stored in a clean condition.
[0007]
7. Machine tool according to any one of claims 3 to 6, characterized in that each tool changer is arranged to remove a head from the machine tool, position the removed head in the storage location; remove a new head from the storage location, and connect the new head to the machine tool.
[0008]
8. Machine according to any one of claims 1 to 7, characterized in that a chamber is provided which is at least in part sealable, wherein, in use, the workpiece is located in the chamber.
[0009]
9. Machine tool according to claim 8, characterized in that the chamber is partially open and is provided with a positionable local shield around the workpiece during processing.
[0010]
10. Machine tool according to claim 8 or 9, characterized in that an environment in the chamber is controllable and can be provided with at least one of: at least one atmosphere of partial inert gas; a low oxygen atmosphere; a soda; a pressure above ambient pressure; a pressure below ambient pressure; a vacuum.
[0011]
11. Machine tool according to any one of claims 1 to 10, characterized in that the machine additionally comprises an integral fitting system, arranged to supply processing material for the processing head.
[0012]
12. Machine tool according to claim 11, characterized by the fact that the or each head comprises a receiving plug-in manifold, and the machine tool has a supply manifold arranged to connect with the receiving manifold in a head processing.
[0013]
13. Machine tool according to claim 12, characterized in that the machine tool includes a spindle for mounting a processing head, and arranged to be movable in the z-direction, wherein the plug-in manifold is provided in a collar of the spindle, or in which the take-up fitting manifold is arranged to be along or adjacent to the spindle, or in which the take-up fitting manifold is rotatable into position.
[0014]
14. Machine tool according to claim 12 or 13, characterized in that the docking system is arranged to provide a clean connection between a docking supply manifold in the machine and a receiving manifold in the processing head.
[0015]
15. Machine tool according to any one of claims 12 to 14, characterized in that the machine tool includes an operable seal provided on at least one half of the connection.
[0016]
16. Machine tool according to any one of claims 1 to 15, characterized in that at least one of the first head and the second head is arranged to extrude material into the workpiece, wherein the machine tool includes a spindle to assemble the first head or the second head, and where the spindle rotation directly controls the amount of extruded material.
[0017]
17. Machine tool according to any one of claims 1 to 16, characterized in that: the second head is selectable from a plurality of interchangeable second processing heads; a first process head of the plurality of interchangeable second process heads has a first deposition feature such that it lays material having a first set of properties on a workpiece at the workstation; a second processing head of the plurality of interchangeable second processing heads has a second deposition characteristic different from the first such that it settles material having a second set of properties, different from the first, on a workpiece at the workstation; and, the machine tool is arranged to automatically change the second head from the first processing head to the second processing head and the second deposition feature is arranged to improve the fidelity of the item being created to the desired item.
[0018]
18. Machine tool according to any one of claims 1 to 17, characterized in that the machine tool which is arranged to carry out the processing steps of a workpiece comprises: i) using a first processing head, having a first deposition feature, for laying material having a first set of properties; ii) exchanging the first processing head with a second processing head, wherein the second processing head is arranged to analyze at least one of the article being created and a function of a processing head.
[0019]
19. Machine tool according to any one of claims 1 to 18, characterized in that: the first head is arranged to eject a fluid into the article being inspected; the first head or the second head is arranged to be coupled to an article being inspected for fluid; and, the machine tool is arranged to transmit a signal by the fluid to inspect the article.
[0020]
20. Machine tool according to any one of claims 1 to 19, characterized in that the machine tool which is arranged to carry out the processing steps of a workpiece comprises: i) using a first processing head, having a first deposition feature for laying material having a first set of properties; ii) process the article being created by pressure treatment.
[0021]
21. Machine tool according to any one of claims 1 to 20, characterized in that the machine tool comprises a processing head arranged to perform two processing steps simultaneously.
[0022]
22. Machine tool according to any one of claims 1 to 21, characterized in that the machine tool comprises a processing head comprising a reservoir of components available for deposit in a workpiece.
[0023]
23. Method for creating an article using a machine tool having a workstation and at least one tool changer remote from the workstation, the method characterized in that it comprises: using a first processing head, having a first characteristic deposition, for settling material having a first set of properties on a workpiece at the workstation; exchanging the first processing head with a second processing head selected from the tool changer, the second processing head having a second deposition characteristic different from the first; settling additional material having a second set of properties, wherein the machine tool retaining the processing head automatically shifts the processing head from the first head to the second head and the second deposition feature is arranged to improve the fidelity of the article being created for the desired article.
[0024]
24. A method for creating an article, characterized in that it comprises: 1) using a first processing head, having a first deposition feature, to lay material having a first set of properties; 2) exchanging the first processing head with a second processing head, wherein the second processing head is arranged to analyze at least one of the article being created and a function of a processing head.
[0025]
25. Method for inspecting an article being manufactured, the method characterized in that it comprises: i) ejecting a fluid from a first processing head onto the article being inspected; ii) coupling a second processing head via fluid to the article being inspected; and iii) transmitting a signal via the fluid to inspect the article.
[0026]
26. Processing head, characterized in that it is arranged to carry out two processing steps simultaneously.
[0027]
27. Method for creating an article, characterized in that it comprises at least one of the following steps of processing a workpiece: i) using a first processing head, which may have a first deposition feature for laying material having a first set of properties; ii) process the article being created by pressure treatment.
[0028]
28. Machine tool arranged to carry out the processing steps of a workpiece, characterized in that it comprises: i) using a first processing head, which may have a first deposition feature to lay material having a first set of properties; ii) process the article being created by pressure treatment.
[0029]
29. Processing head for a machine tool, the processing head characterized in that it comprises automated means adapted to be able to move a workpiece or a portion of a workpiece.
[0030]
30. Processing head for a machine tool, the processing head characterized in that it comprises a reservoir of components available for deposit in a workpiece.
[0031]
31. Machine tool according to any one of claims 1 to 23, characterized in that the material is one or more of: metals, non-metals, polymers, ceramics, clay, salts, conductive, capacitive or dielectric materials, in form of powder, filaments, rods, sheets of fibers (short, chopped, long or continuous), or metallic threads, in a suspension in one of a liquid, emulsion, gas, aerosol, paste, in solid or semi to completely liquid form or in cooling or processing fluids, gases and the like, including mixtures thereof.
[0032]
32. Machine tool adapted and arranged to perform the removal and addition of material on a workpiece located at a work station, characterized in that the machine tool has a processing head arranged to extrude material into the workpiece. work and detachably connected to a machine tool spindle, where spindle rotation directly controls the amount of extruded material.

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同族专利:

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公开号 | 公开日

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US20170129180A1|2017-05-11|

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CN106457495A|2017-02-22|

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KR20170018006A|2017-02-15|

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BR112016028857A2|2017-08-22|

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US20200331062A1|2020-10-22|

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JP2017530260A|2017-10-12|

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IL249335D0|2017-02-28|

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WO2015189600A3|2016-02-04|

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SG10201810803SA|2018-12-28|

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SG11201610234VA|2017-01-27|

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EP3152034A2|2017-04-12|

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WO2015189600A2|2015-12-17|

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法律状态:
2020-01-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-06-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-08-24| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/06/2015, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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GB1410229.7|2014-06-09|

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GBGB1410229.7A|GB201410229D0|2014-06-09|2014-06-09|Material processing method and related apparatus|

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GB1412843.3|2014-07-18|

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GBGB1412843.3A|GB201412843D0|2014-06-09|2014-07-18|Material processing method and related apparatus|

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GB201423407A|GB201423407D0|2014-06-09|2014-12-31|Material processing method and related apparatus|

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GB1423407.4|2014-12-31|

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GBGB1506154.2A|GB201506154D0|2015-04-10|2015-04-10|Hybrid machine|

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GB1506154.2|2015-04-10|

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PCT/GB2015/051689|WO2015189600A2|2014-06-09|2015-06-09|Material processing methods and related apparatus|

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