• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a workpiece cleaning device for a machine tool (10) for removing a machining fluid remaining on a workpiece after machining. In particular, the invention relates to the removal of a machining fluid from toothed workpieces. A particular feature of the invention is an at least two-stage cleaning process with a pre-cleaning of the workpieces and a spin-drying station (60), in which preferably the processing liquid adhering to the outer circumference is spun off.
    公开号:CH710171A2
    申请号:CH01112/15
    申请日:2015-07-31
    公开日:2016-03-31
    发明作者:Johannes Weixler；Hansjörg Geiser
    申请人:Liebherr Verzahntech Gmbh；
    IPC主号:
    专利说明:

    The present invention relates to an integrated in a machine tool cleaning device for removing a remaining on a workpiece after machining machining fluid. In particular, the present invention relates to the removal of a machining fluid from toothed workpieces.
    A particular feature of the invention is an at least two-stage cleaning process with a pre-cleaning, preferably the inner contour of the workpieces, and a spinning station in which preferably the adhering to the outer circumference machining fluid is thrown off.
    When machining workpieces, especially in the machining of toothed workpieces, a machining fluid for cooling the workpiece and the tool and for the removal of machining chips is used. Depending on the machining process, different cooling lubricants are used. When machining gear teeth, mainly cooling oil is used, but in rare cases also an emulsion. The cooling lubricants differ depending on the processing method in terms of their viscosity. Especially with higher viscosity, it is difficult to free the workpieces from the coolant.
    The trend in manufacturing is now increasingly in the direction of dry machining of workpieces to avoid the entire coolant handling. Especially for environmental reasons, attempts are made to dispense with cooling lubricant. In processes where cooling lubricants can not be dispensed with at present, an attempt is made to minimize the removal of coolant lubricant from the machine. In some follow-up processes to prevent that the coolant used there is mixed with the coolant from the previous process and thereby changed. Overall, the coolant interferes with the follow-up process. In addition, the arranged between the machines automation equipment and transport routes should not be contaminated by falling chips or dripping coolant.
    For this reason, today many users value as possible coolant and chip-free workpieces when they are transported out of the machine. By specifying how long a workpiece must remain drip-free, some customers try to define a measure of the purity of the workpieces.
    One way to remove the coolant from the workpieces consists for example in a spin-drying station. In this case, such a spinning station has a workpiece holder which can be set in rotation by a drive in order to free a workpiece which can be received in the workpiece holder from adhering processing fluid. The removal of the machining fluid is thus carried out by the centrifugal force generated by rotation. Such a spinning station is known for example from DE 10 2005 043 602 A1. The workpiece is thereby pivoted directly from its processing point in a transfer station designed as a spinning station and there freed from adhering cooling lubricant.
    DE 10 2012 023 978 A1 also shows an external spinning station for cleaning workpieces. In this transfer device, the workpiece is taken over by a loading system of the machine tool and transported by a movement in a spinner. There, the cooling lubricant is thrown off. After the cleaning process, the workpiece is stored together with its workpiece carrier on a workpiece feed.
    Furthermore, it is known to mount centrifugal devices on external belts, which supply the machine with workpieces and carry them away from the machine. However, this installation site has the disadvantage that chips and coolant with the workpieces are first transported out of the working space of the machine, to then be removed from the workpiece outside the working space. The cooling lubricant can be pumped back relatively easily. However, this is already a major problem with adhering shavings, which means that the shavings accumulate on the spinning station and can not easily be washed back again.
    The above-described spinning stations remove outside the workpiece adhering machining fluid relatively well. However, workpieces with internal areas are difficult to remove from the machining fluid by a spinning station. Furthermore, the distance on the outside is not optimal. Especially in the tooth gaps and in holes, grooves etc. often remains machining fluid which accumulates over time and then drips down from the workpiece. Furthermore remains on the grippers and workpiece supports cooling lubricant when they are left during processing in the work area. Now, if the workpiece is gripped again after the spinning process with these liquid grippers, or if the workpiece is returned to the workpiece supports, there is again a return of the cooling lubricant to the workpiece.
    Object of the present invention is therefore to improve the removal of machining fluid of workpieces, in particular of toothed workpieces.
    This object is achieved according to the invention by a cleaning arrangement for removing machining fluid on workpieces according to the combination of the features of claim 1.
    The present invention provides a combination of a spinning station for removing externally adhering to the workpiece processing fluid and a cleaning device, preferably in the interior areas of the workpieces and / or, if necessary workpieces are also pre-cleaned on the outer circumference or. This helps to improve the cleaning result, especially in the tooth gaps and / or holes. The cleaning station is preferably arranged in front of the spinning station, so that the workpieces are already pre-cleaned, before they then come to the final spin to the spin station. By dividing the cleaning process in at least two stages, a significantly improved removal of the machining fluid is achieved by the workpieces.
    Preferred embodiments of the invention will become apparent from the dependent claims.
    The inventive cleaning station is formed in a first embodiment as a compressed air lance. In particular, the compressed air lance can be used to clean a bore of the workpiece. In a further embodiment, the workpiece can be additionally already cleaned on its outer circumference via an outer peripheral cleaner, for example in the form of an annular nozzle.
    By the inventive blowing with compressed air a significantly improved removal of machining fluid is achieved. The compressed air cleaning arrangement according to the invention thus makes it possible, in particular, to remove machining fluid also from those areas of the workpiece from which it can not be removed by spinning on the spinning station.
    The compressed air cleaning arrangement may in particular be machining fluid which adheres to an inner and / or adhering to an outer region of the workpiece by blowing with compressed air. In the arrangement for cleaning internal workpiece surfaces, a rod (compressed air lance), in the head region of which a compressed air outlet is arranged, is moved downwards in the longitudinal direction of the workpiece bore, with a vertical workpiece arrangement. In this case, the machining fluid is conveyed by the compressed air jet from the workpiece bore in the direction of gravity. At this point, the cleaning process can be further supported by slowly turning the workpiece around its central axis.
    In addition, the workpiece can be freed on its outer surfaces of the machining liquid with a second outer peripheral cleaner. In this case, an annular nozzle along the outer surface of the workpiece is moved parallel to the direction of the Werkstückmittelchachse.
    The speed of the compressed air cleaning nozzles can be adapted individually to the workpiece contour. Thus, the interior and, if necessary, the external cleaner can be controlled individually in its speed of movement. If necessary, the pressure or the amount of compressed air depending on the workpiece contour or the position of the / cleaners relative to the workpiece contour, operated at different pressures, so as to limit the total compressed air consumption to the necessary extent.
    The adaptation of the compressed air cleaning system to the workpieces can continue to be done by specially adapted to the diameter compressed air lances and Außenumfangsreingier. These are then changed during the conversion of the machine tool from one workpiece type to the next one. This can improve the cleaning performance, also the compressed air consumption can be reduced if the compressed air cleaner have only a small air gap relative to the inner or outer diameter of the workpiece. Since compressed air cleaners are simply constructed and therefore inexpensive components, the additional investment for each workpiece is always worthwhile. This is a one-time purchase whereas compressed air consumption represents ongoing operating costs.
    This pre-cleaned workpiece is added to the machine-internal loading system after the pre-cleaning process with the workpiece gripper at its periphery. It is accepted that the still dirty by the processing process gripper picks up the more or less cleaned workpiece on its outer circumference.
    The workpiece is then further clocked to the transfer device / spin station and placed there by the Absenkeinrichtung on the workpiece holder of the spinning station.
    The workpiece holders are designed so that they have only a minimum of contact surface with the workpiece in order to identify as few surfaces where a residual oil film can hold between the workpiece and workpiece support. The minimum size of the contact surface is determined by the spin torque required for the spin.
    After the workpiece has been placed, in this embodiment, the workpiece is clamped in the spinning station by the spinning station is lowered with the upper workpiece holder on the workpiece and so the workpiece is clamped.
    Subsequently, the gripper is opened and the gripper inserts are swung out of the work area. Alternatively, the grippers are opened slightly to collapse down below the lower edge of the workpiece contour without collision. This prevents machining fluid from dripping from the grippers onto the workpiece after the spin process.
    The procedure also differs by the design of the gripper or workpieces. So it may be non-positive or positive gripper and disc or wavy workpieces.
    After the spinning process, the external loading door is opened and the cleaned workpiece can be removed from the clamping by the machine operator or an external automation with a gripper and / or exchanged for an unprocessed workpiece. This procedure prevents the external gripper from coming into contact with dirty machine components.
    Further features, details and advantages of the invention will become apparent from exemplary embodiments illustrated in the drawing. Showing:<Tb> FIG. 1: <SEP> a schematic representation of a cleaning arrangement according to the invention, consisting of a cleaning device and a spinning station and arranged on a four-station charging system,<Tb> FIG. 2: <SEP> is a schematic diagram of a two-station supercharger with a prior art spinner station;<Tb> FIG. 3 shows an embodiment of a gear cutting machine with a cleaning device according to the invention, as shown in FIG. 1, FIG.<Tb> FIG. 4: <SEP> an exemplary embodiment of a compressed air cleaning station for cleaning the inner bore of a workpiece,<Tb> FIG. 5: <SEP> a detailed view for a compressed air cleaning station with a compressed air lance and a compressed air outer peripheral cleaner and<Tb> FIG. 6a, b: an exemplary embodiment of a spinning station for cleaning a workpiece on its outer circumference.
    Fig. 1 is a schematic drawing of a gear cutting machine 10 according to the invention with a machine working space MR, a region in which the pre-cleaning takes place VR and in a transfer area ÜR with integrated spinning station 60. The workpieces are for machining in the machine of an external automation or a machine operator via the loading opening 22 on the transfer position, which simultaneously represents the spinning station stored. From there they are picked up by the internal loading system, in this case a four-station ring loader 90 rotating about a backrest 80, and automatically tensioned for machining on the machine table 35 via a stopover, unused in this example. The machining tool 30 is delivered to the workpiece via the machining head 40 by a feed movement of the machine stand 45 in the direction of the X1 axis and generates or processes the toothing on the workpiece 25.
    After completion of the machining process, the workpiece with a gripper 95 are gripped by the gripper inserts 96 and positioned after a 90 ° pivot each in the next station. The workpiece from the machining process thus enters the pre-cleaning station, for example a compressed-air cleaning device 70, where it is pre-cleaned by the machining coolant lubricant. In this case, it is preferably about areas that can be insufficiently cleaned in the subsequent spinning station, free of processing cooling lubricant and / or reduce the amount of cooling lubricant that must be removed in the spinning station before, so as to achieve a better cleaning result achieve. The pre-cleaning area is separated from the processing area MR via a machine-internal partition wall 110 with automatically closable through-loading openings 100. This separation prevents, on the one hand, that cooling lubricant spills over from the machining process to the cleaning process; in the case of a gear grinding machine as a safety device, above all because preferably all process steps are to take place parallel to the main time (the cycle time specification comes from the machining process).
    Fig. 2 shows the prior art, as disclosed for example in DE 10 2005 043 602. Here, the workpiece is placed directly after the spin process in a spinning station and cleaned on its outer circumference. In addition to the version shown with a two-station loader, this version is also available in different versions with multi-station loaders in the state of the art.
    Fig. 3 shows an example of a gear cutting machine 10 according to the invention, in which the safety housing 20 of the machine has been partly omitted or the dimension has been represented by dashed dotted lines in order to better show the area of the cleaning device. The machine is operated via the control panel 50. The upper sleeve 64 for the spinning station 60 is independent of the gear cutting machine next to this on the hall floor. This prevents vibrations from the spinning process being transferred to the workpiece machining. In the pre-cleaning station 70, however, only a slow linear movement of the compressed air lance or the outer peripheral cleaner takes place, so that it can be easily attached to the backrest 80, without affecting their movement adversely. The spinning station is driven by the motor 65, which is attached to the lower console 69.
    In the embodiment shown in Fig. 4, the cleaning station on an inventive compressed air cleaning assembly 70, which is used to free the shaft bore of the workpiece 25 of cooling lubricant. As can be seen in Fig. 4, the compressed air cleaning assembly 70 is a compressed air lance 71, which can be inserted into the shaft bore of the workpiece 25 to remove the cooling lubricant present there by blowing with compressed air.
    The compressed air lance 71 is movable via a positioning arrangement into the shaft bore and out of it. For this purpose, a rear portion of the compressed air lance 71 is attached to a carriage 72, which is linearly displaceable on a guide 75. To move the carriage 72, this is connected to an actuator - in the present case a motor 76, which acts via an angle gear 77 on a toothed rack 74, - in connection and can be linearly displaced along this along the guide 75. The direction of travel of the carriage is parallel to the longitudinal extent of the compressed air lance 71st
    The compressed air lance 71 is designed tubular and has in its interior a compressed air channel, which is in communication with a compressed air supply P, not shown. For this purpose, a quick coupling 73 is provided in the region of the connection of the compressed air lance 71 with the Verfahranordnung 72, via which the compressed air channel in the interior of the tubular compressed air lance 71 is in communication with the compressed air supply. About the quick coupling workpiece-specific compressed air lances can be changed relatively easily.
    The workpieces 25 to be cleaned are pivoted out of the processing space via the ring loader 90 via the C3 axis about the backrest 80. For this purpose, the workpiece is gripped with the gripper inserts 90 and the gripper is moved over the lowering guide 97 upwards into the pivoting position. By this procedure, it is possible, for example, to wave-shaped workpieces into a chuck. At the pre-cleaning station, the workpiece is held only in position in this embodiment, so that the compressed air lance can dip into the workpiece bore. In addition to the compressed air lance, an outer peripheral cleaner can be arranged at this position, which in this case then blows off cooling lubricant on the outer circumference of the workpiece with compressed air, wherein it moves linearly in the direction of the workpiece axis.
    Fig. 5 shows a compressed air lance 71 and a Druckluftaussenumfangsreiniger 76 with an annular nozzle 79 when cleaning a workpiece 25. By the linear movement of the compressed air lance 71 down and the structure of the lance head with the compressed air, the cooling lubricant from the bore along the inner wall it Workpiece blown down. In parallel, the outer peripheral cleaner can clean the outer surface and the tooth gaps of the workpiece. The workpiece is held by the workpiece grippers (not shown) or deposited on a workpiece holder (not shown).
    The spinner station in FIGS. 6a and 6b has a workpiece spindle with an upper workpiece holder 62 and a lower workpiece holder 63, between which a workpiece 25 can be clamped. The lower workpiece spindle 63 can be driven via the drive 65. The upper sleeve 61 is arranged to be movable on the stand 64 in the height direction. For this purpose, the sleeve 61 is arranged linearly displaceable on a guide of the stator 64 and can be adjusted in height via an actuator (not shown), in the embodiment an electric motor.
    A workpiece can be received in the workpiece spindle, characterized in that the workpiece is placed with the grippers 95 on the lower workpiece holder 63 and then the upper workpiece holder 62 moves together with the sleeve 61 so long down to contact with the workpiece top. The workpiece 25 is preferably frictionally engaged with the lower workpiece holder 63 in conjunction and can thereby be rotated via the drive 65 in rotation.
    Advantageously, the workpiece 11 is thereby rotated in the spinning mode at a speed between 500 revolutions per minute and 5000 revolutions per minute to remove still adhering to the outer periphery of the workpiece coolant residues.
    The gripper inserts 96 are, as shown in this embodiment, pivoted away to the rear. Gripper inserts that are not hinged can also be lowered below the lower edge of the workpiece.During the subsequent loading and unloading process, it is also advantageous not to allow the gripper inserts to stand in the region of the path piece, so that dripping of cooling lubricant from the gripper inserts onto the cleaned workpiece can be prevented.
    权利要求:
    Claims (10)
    [1]
    1. Workpiece cleaning device for a machine tool, in particular for a gear cutting machine, with a loading system for transporting workpieces from a machine loading and unloading station to the processing station and after processing back to the machine loading and unloading station, wherein the loading system at least three positions within the machine can start, and with a spinning station for cleaning the Werkstückaussenkontur, characterizedin that, in addition to the spinning station, at least one further cleaning station is provided for cleaning the workpieces, preferably at their inner contours.
    [2]
    2. Workpiece cleaning device according to claim 1, characterized in that the loading system for the cleaning device is designed as a ring loader with a pivot axis or as a loading portal with a linear loading axis.
    [3]
    3. Workpiece cleaning device according to claim 1 or 2, characterized in that the spinning station is arranged with its spinner within the safety enclosure of the machine, the mounting bracket for attaching the spinner but is mounted separately next to the machine on the hall floor, thus vibrations and / or vibrations the spin operation is not transferred to the processing machine, wherein the Sicherheitsaushausung has a resilient and oil-tight interface between the mounting bracket and the spinner.
    [4]
    4. Workpiece cleaning device according to one of claims 1 to 3, characterized in that an additional cleaning station is designed as a compressed air cleaning station with at least one linear axis for moving at least one cleaning nozzle parallel to the workpiece center axis.
    [5]
    5. workpiece cleaning device according to claim 4, characterized in that the compressed air cleaning station is equipped with a compressed air lance for cleaning the workpiece inner contour and / or with a Druckluftaussenumfangsreiniger.
    [6]
    6. Workpiece cleaning device according to claim 4 or 5, characterized in that the compressed air cleaning device has a control device with which the travel speed and / or the pressure of the compressed air is adjustable depending on the workpiece contour.
    [7]
    7. Workpiece cleaning device according to one of claims 4 to 6, characterized in that the compressed air lance and / or the Druckluftaussenumfangsreiniger are designed as a removable part, so that the compressed air cleaning station is individually adapted to the workpiece dimensions, the removable parts are preferably equipped with a quick change port.
    [8]
    8. Workpiece cleaning device according to one of the preceding claims, characterized in that between the processing space for the workpiece and the cleaning area a splash-proof partition is arranged with at least one closable opening, wherein the at least one opening during workpiece change can be opened automatically, so that the loading system, the workpieces can exchange automatically in the editing area.
    [9]
    9. Workpiece cleaning device according to one of the preceding claims, characterized in that the spinning station is additionally equipped with a movable splash guard, which catches the majority of the centrifuged processing liquid.
    [10]
    10. Workpiece cleaning device according to one of the preceding claims, characterized in that the workpieces can be removed from the machine after the last cleaning operation by an external loading system, in order to prevent the return of machining fluid to the cleaned workpiece.
    类似技术:
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    WO2012168489A1|2012-12-13|Machine tool and method for a machine tool
    DE102014011133A1|2015-12-03|Centrifugal station and compressed air cleaning arrangement
    EP3819073A1|2021-05-12|Machine tool
    DE102015004211B4|2017-03-23|After the pick-up process working grinding machine
    DE102007016120A1|2008-07-24|Method for cleaning and transporting of metallic workpieces after its manufacturing and processing, involves transferring of workpieces after its manufacturing and processing of machine-side transport system into cleaning position
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    EP1524076B1|2005-04-27|Apparatus for grinding pieces for chucks.
    同族专利:
    公开号 | 公开日
    CN105458819A|2016-04-06|
    ITUB20153931A1|2017-03-28|
    DE102014014417A1|2016-03-31|
    CH710171B1|2020-09-30|
    CN105458819B|2019-08-13|
    引用文献:
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    法律状态:
    2020-09-30| PFA| Name/firm changed|Owner name: LIEBHERR-VERZAHNTECHNIK GMBH, DE Free format text: FORMER OWNER: LIEBHERR-VERZAHNTECHNIK GMBH, DE |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014014417.8A|DE102014014417A1|2014-09-29|2014-09-29|Cleaning device and spinning station|
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