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    • 专利摘要:
    Systems and methods are provided for generating an energy density map of an object to be built in an additive production environment. Certain embodiments provide a method of building an object using additive production, the method comprising the following: receiving a work file to build the object, the work file comprising a plurality of cuts of the object, and wherein a first section of the object indicates scan lines to direct an energy source to building material to build up the first section of the object; determining operating parameters of the energy source; and generating a first energy density map of the first cut of the article based on the work file and operating parameters of the energy source, the first energy density map indicating an amount of energy from the energy source per surface building material directed to the building material for the first cut of the object.
    公开号:BE1024495B1
    申请号:E2016/5982
    申请日:2016-12-27
    公开日:2018-03-13
    发明作者:Michele Pavan；Den Ecker Piet Van；Tom Craeghs
    申请人:Materialise N.V.；
    IPC主号:
    专利说明:

    ENERGY DENSITY CLASSIFICATION IN ADDITIONAL PRODUCTION ENVIRONMENTS
    CROSS REFERENCE TO RELATED APPLICATION
    This application takes priority on U.S, Provisional Patent Application No. 62 / 400,392, filed September 27, 2016, which is herein expressly incorporated in its entirety by reference. BACKGROUND OF THE INVENTION Field of the Invention This application relates to the spatial energy distribution for building an object in an additive production environment. More specifically, this application relates to systems and methods for generating an energy density map of an object to be built in an additive production environment.
    Description of the related technology.
    Scanning systems (e.g. Sasenscanning systems, electron beam scanning systems, etc.) are used in many different applications. One of these applications is the field of additive production, in which three-dimensional solid objects are formed on the basis of a digital model. Because the objects produced are three-dimensional, additive production is usually referred to as three-dimensional Ç3D printing. The use of scanning systems in additive production is especially common in the production techniques stereoiithography, selective laser sintering ("LS") and laser melting. These techniques use scanning systems to direct an energy source (eg laser beam, electron beam, etc.) to a specific location to create, polymerize or cure layers of building materials used to create the desired three-dimensional (! 3D) object [ In processes that produce articles such as sintering, the energy source of the scanning system provides energy that is required to polymerize, sinter or melt layers of the building material. Warming up and providing energy to polymerize or cure layers of building material can affect wasteful aspects of the article produced.
    RESUME
    Certain embodiments of this disclosure provide a method of building an object using additive production, the method comprising: receiving a work file to build the object, the work file comprising a plurality of cuts of the object and wherein a first cut of the object indicates scan lines to direct an energy source to building material to build up the first cut of the object; determining operating parameters of the energy source; and generating a first energy density map of the first cut of the article based on the work file and operating parameters of the energy source, the first energy density map indicating an amount of energy from the energy source per surface building material directed to the building material for the first cut of the object.
    Certain embodiments of this disclosure provide an apparatus for building an object using additive production, the apparatus comprising: a memory; and a processor configured to: receive a work file to build the object, the work file comprising a plurality of cuts of the object, and wherein a first cut of the object indicates scan lines to direct an energy source to building material to the first build up the cut of the object; determining operating parameters of the energy source; and generating a first energy density map from the first cut of the article based on the. working file and operating parameters of the energy source, the first energy density map indicating an amount of energy from the energy source per area of building material directed at the building material for the first cut of the object.
    Certain embodiments of this disclosure provide a device for building an object using additive production, the device comprising: means for receiving a work file to build the object, the work file including a plurality of cuts of the object and wherein a first cut of the object indicates scan lines to direct an energy source to building material to build up the first cut of the object; means for determining operating parameters of the energy source; and means for generating a first energy density map of the first cut of the article based on the work file and operating parameters of the energy source, wherein the first energy density map indicates an amount of energy from the energy source per area of building material directed to the building material for the first cut of the object.
    Certain embodiments of this disclosure provide a computer-readable storage medium on which instructions are stored for performing a method of building an object using additive production, the method comprising the following: receiving a work file around the object building, the working file comprising a plurality of cuts of the article, and wherein a first cut of the article indicates scan lines to direct an energy source to building material to build the first cut of the article; determining operating parameters of the energy source; and generating a first energy density map of the first cut of the article based on the work file and operating parameters of the energy source, wherein the first energy density map indicates an amount of energy from the energy source per surface building material directed to the building material for the first cut of the object.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 illustrates an example of a scan pattern corresponding to a layer of an object.
    Figure 2 is a graph illustrating the various dynamic behaviors of a sample energy source.
    Figure 3 illustrates an example of a visual representation of an energy density map for a layer of an object.
    Figure 4 illustrates exemplary operations for generating an energy density map for a layer of an object, in accordance with certain aspects of this description.
    Figure 5 illustrates an example of a visual representation of a 3D energy model of an object.
    Figure 8 illustrates exemplary operations for identifying critical sections in an article, in accordance with certain aspects of this description.
    Figure 7A Illustrates an example of a visual representation of an energy density map for a layer of an object prior to adjusting the structure of identified critical sections of the object.
    Figure 7B illustrates an example of a visual representation of an energy density map for a layer of an object after adjusting the structure of identified critical sections of the object.
    Figure 8 is an example of a system for designing and producing 3D objects.
    Figure 9 illustrates a functional block diagram of one example of the computer shown in Figure 8.
    Figure 10 broadly shows a process for producing a 3D object using an additive production system.
    DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS
    OF THE INVENTION
    The following description and the accompanying figures are directed to certain specific embodiments. The embodiments described in any particular context are not intended to limit this description to the specified embodiment or to any particular use. Those skilled in the art will recognize that the described embodiments, aspects and / or characteristics are not limited to a specific embodiment.
    The systems and methods described herein can be performed using various additive production * and / or three-dimensional (3D) printing systems and techniques. Typically, additive production techniques start from a digital representation of the 3D object to be formed, generally the digital representation is divided into a series of cross-sections that form layers, or "cuts", superimposed around the object as a whole to shape. The layers represent the 3D object, and can be generated using modeling software for additive production that is performed on a computer system. For example, the software may include CAD / CAM software (Computer Aided Design computer-assisted design / Computer Aided Manufacturing computer-assisted production), information about the cross-sectional layers of the 3D object may be stored as cross-sectional data. An additive production machine or system (eg, 3D printing) uses the cross-sectional data to build the 3D object layer by layer. Accordingly, additive production allows to produce 3D objects directly from computer-generated data of the objects, such as CAD ~ countries (Computer Aided Design) or STL files. Additive production provides the ability to quickly produce both simple and complicated parts without tools and without the need to assemble different parts.
    Additive production processes generally include providing energy from an energy source (e.g., a laser, an electron beam, etc.) to cause layers of building material (e.g., plastic, metal, etc.) to cure (e.g., polymerize) . The additive production machine can, for example, selectively direct energy from an energy source (e.g. scan) to the building material on the basis of a work file. The working file may include information regarding cuts of a digital representation of an object to be built using an additive manufacturing process. For example, for each cut, the work file may include information about a scan pattern for the energy source to direct energy at (e.g., laser to scan, electron beam to scan, etc.) the physical layer building material corresponding to that cut. It should be noted that, as discussed herein, the terms cut and layer are interchangeable. The scan pattern may comprise one or more vectors each indicating a spatial position to direct the energy to the layer of building material and a direction to direct the energy to the building material! (e.g., a direction to move the electron spiral, e-electron beam, or other energy source over the building material during scanning), An additive manufacturing machine builds an item layer by layer by directing energy onto (e.g., scanning) the layers of building material. accordance with the scan pattern for each individual layer as indicated in a work file. The additive production machine can, for example, scan a first layer of physical building material corresponding to a first cut of a digital representation of an object in accordance with the scan pattern for the first cut. The additive production machine can then scan a second layer of building material corresponding to a second cut adjacent to the first cut in accordance with the scan pattern for the second cut. The additive production machine continues to scan layers of construction material according to all cuts in the working file until the layer corresponding to the last cut is scanned.
    During the scanning process, energy from the energy source is directed to the building material, layer by layer, to build up the object layer by layer, in some aspects some sections or areas of an object may receive a different amount of energy than other sections of the object.
    For example, different sections or areas of different layers of building material may receive different amounts of energy. These different amounts of energy that are directed to different sections of a layer of an object can have an effect on the object ultimately built. For example: a property of different sections of the article, such as a strength, thickness, porosity, size, shape, finish etc. may be based on the amount of energy that is directed to the sections. Thus, controlling the amount of energy that is directed at the building material during the building process of an object can have an impact on the overall quality of the final built object.
    Accordingly, certain embodiments provided herein provide systems and methods for generating energy density maps for an article to be built in an additive production environment. An energy density map can be generated, for example, for any cut of a digital representation of an object (e.g., a work file). The energy density map can indicate an amount of energy (e.g., created amount of energy or actual applied energy) that is directed to a layer of building material from the energy source per surface area of the building material layer when producing the layer of the object.
    In some embodiments, the energy density map is used to identify critical sections (e.g., sections where errors may occur during construction, which can be referred to as a non-conformity) of the object (e.g., areas or volumes) , or the probability that a section contains an error or non-compliance. For example, the energy density map can be used to identify sections of the object that may not meet the necessary quality (eg, empty spaces in the object, deformation, weakness, high porosity, etc.). in some embodiments, the energy density map can be used to estimate or determine sections with geometric non-conformities (e.g., differences between the actual resulting dimensions of the built object, and the dimensions of the digital representation of the object). In some embodiments. the energy-tight hero card used to optimize the building of the object. For example, the roaming of energy from the energy source to the building material in identified critical sections of the object can be adjusted. For example, the scan pattern, the power source power, the speed at which the energy source is moved during scanning, the shape of the energy source radius and / or the radius of the energy source can be adjusted. in some embodiments, the scan pattern can be adjusted by changing the work file (e.g., adding more or fewer scan lines) in identified critical sections of the object. In some embodiments, the application of energy from the energy source to the building material in identified critical sections can be changed automatically. Accordingly, the generation of an energy-tight hero card can advantageously allow for better control of additive production processes, and lead to higher quality for objects built using additive production processes.
    Selective laser sintering (LS) is an additive production technique used for 3D printing of objects. LS devices often use a high-power laser (e.g., a carbon dioxide laser) to "sinter" (ie, melt) small particles of plastic, metal, ceramics, glass powders, or other suitable materials into a 3D object. The LS device can use a laser to scan cross-sections on the surface of a powder bed in accordance with a CAD design or work file. The LS allowance can also lower a building platform over one layer thickness after a layer has been completed and add a new layer of material so that a new layer can be formed. In some embodiments, an LS device may pre-heat the powder to make it easier for the laser to raise the temperature during the sintering process. Although embodiments described herein can be described with respect to LS, the embodiments can also be used with other suitable additive production techniques, as will be understood by a person skilled in the art.
    Figure 1 illustrates an example of a scan pattern 100 corresponding to a layer of an object. The scan pattern 100 is, for example, for a cut of a digital representation of the object corresponding to the layer of the object. The cut can be one of a plurality of cuts that form part of a working file used by an additive manufacturing machine to build the object. As shown, the scan pattern 100 includes a series of lines 105. The lines 105 of the scan pattern 100 indicate to the additive production machine where energy is to be directed from an energy source to building material in accordance with the layer of the object. For example, the additive production machine can scan an energy source (e.g., a laser beam, electron beam, etc.) over a layer of building material in a pattern corresponding to the lines 105 of the scan pattern 100. In some aspects, the lines 105 comprise vectors. The vectors of the lines 105 indicate a spatial position where the energy is to be directed to the building material layer and a direction to move the energy source and to direct energy to the building material (e.g., a laser beam, electron beam, or other energy source direction) ie moving over the building material during scanning).
    In some embodiments, a computer system may store and open a work file for an object. As discussed, the work file comprises a digital representation of the object. The digital representation of the object can include a plurality of cuts corresponding to layers of the object. Each of the cuts may include a scan pattern such as the scan pattern 100. In some embodiments, the computer system is configured to generate an energy density map for each Saag of the object based on the corresponding cut in the working file for the object.
    In some embodiments, the computer system generates an energy density map for a layer of an object based on the scan pattern for the layer (e.g., in a work file) and operating parameters of the energy source of the additive production machine used to build the object. The operating parameters (e.g., for a laser beam) may include, for example, one or more of the following: a power source power, a power source scanning speed, a magnitude (e.g., a diameter) of a beam emitted by the power source, and a form of a beam emitted from the energy source, in some aspects, such as if the energy source comprises an electron beam, the operating parameters may include one or more of the following: a power source power, a power source scanning speed, an acceleration voltage, and a current of the energy source. As described, the working file comprises a digital representation of the object, comprising a cut corresponding to the layer of the object. The cut comprises a scan pattern based on. scan pattern 100}.
    The computer system can determine a spatial position of the energy source that is used to scan the layer of building material corresponding to the layer of the object based on the scan pattern of the corresponding cut. In particular, as discussed, the scan pattern can indicate the spatial position and direction to focus energy on the layer of building material. The computer system may further calculate the amount of energy that may be applied by the energy source to each surface on which the energy is to be directed to the layer of building material. For example, the computer system may calculate the energy to be directed by the energy source to each surface on basis of the scan pattern and operating parameters of the energy source, In particular, in some embodiments, the computer system uses the spatial position of the energy source, and optionally the beam shape and / or beam size (e.g., for a laser beam) or the cutting voltage and / or current intensity (eg, for an electron beam) to determine the areas on the building material to which energy should be targeted. Furthermore, the computer system uses the scanning speed and / or direction to which or in which the energy source must be moved during scanning to determine a time during which the energy must be directed to each area. The computer system then uses the power source power and the duration during which the energy is to be directed to each area to determine the amount of energy to be directed to each area of the building material. For example, the computer system may multiply the duration during which energy is to be directed by the power source power for each area of the building material. In another example, the computer system may divide the power source power by the speed (e.g., scanning speed) of the movement of the energy source over the building material for each area of the building material to determine the amount of energy directed by the energy source at each area, In some embodiments, the computer system generates an energy density map for a layer of an object based on the scan pattern for the layer (e.g., in a work file) and operating parameters of the energy source of the additive production machine used to build the object, and is based on the dynamic behavior of the energy source. Dynamic behavior of the energy source may include a dynamic behavior of a scanner of the energy source, such as displacement of mirrors that control a laser beam. Dynamic behavior of the energy source may also include dynamic behavior of the energy itself, such as the rise time and the fall-off time of the power source's power (e.g., laser). The dynamic behavior of the energy source may include, for example, one or more of the following: a rise time, a set-up time, a wait time, a cut-down time, and a delay time of the energy source. Figure 2 is a graph 200 illustrating the various dynamic behaviors of an example energy source, in particular the x ~ axis represents the time, and the y ~ axis represents a power source power. For example, the rise time tf of the energy source may be the time it takes for the energy source to reach a percentage (e.g. 98%) of the power used to scan the building material. The cut-off time of the energy source can be the time before a stable scanning speed is achieved. The waiting time td can be the time it takes for the energy source to start generating energy after receiving the energy generation command. The support time ts may be the time required for the energy source to reach a stable state (e.g., within 2-5% of the power used to scan the building material). The delay time of the energy source may be the time before movement of the energy source is stopped, [0034] The dynamic behavior may be used by the computer system, together with the previously discussed scan pattern and the operating parameters, to determine a duration during which the energy is focused on each area, and a power source power that is focused on each area. As previously discussed, the computer system then uses the power source power and the duration during which the energy is directed to each area to determine the amount of energy to be directed to each area of the building material. In another example, dynamic behavior can be used by the computer system, along with the previously discussed scan pattern and operating parameters, to determine a speed at which the energy is directed to each area, and a power source power target to each area. The computer system may divide the power source power by the speed (e.g., scanning speed) of the movement of the energy source across the building material for each area of the building material to determine the amount of energy directed by the energy source into each area, in some aspects, the speed of the energy source is adjusted based on the capacity.
    In some aspects, the dynamic behavior of the energy source for a particular energy source can be determined based on the energy source, and aspects of the additive production device comprising the energy source, in some aspects a control which is coupled to the additive production device and which is arranged to control the operation of the additive production device, configured to identify such dynamic behavior of the energy source and to provide such information to the computer system, in some aspects the control itself is the computer system, in some aspects the dynamic behavior may of the energy source, and accordingly the estimated amount of energy, are determined without actually building the object, The computer system can accordingly determine the estimated amount of energy to be applied to each area of the layer of building material based on the scan pattern and operating parameters of the energy source , and optional dynamic behavior of the energy source. The amount of energy can for example be displayed as a number of Joules per surface area of building material (eg j / mm2). The amount of energy in each area can be aggregated and used to generate an energy density map that indicates the amount of energy to be applied to each area of the building material layer. In some aspects, the estimated amount of energy can be determined without actually building the object. The similar energy density maps that are calculated without actually building the object can be examples of pre-assembled energy density maps. Accordingly, the computer system determines how much energy is applied to each area of the building material layer. In some embodiments, the energy density map for a layer comprises a series of values indicating an amount of energy correlated to a spatial location (e.g., coordinates, size, shape, etc.) of an area of the building material. Figure 3 Illustrates an example of a visual representation of an energy-sealed hero card 300 for a layer of an object. The amount of shadow in each area of the density map 300 can indicate the energy density (e.g., amount of energy used) in each area of the building material for the layer. For example, a darker shade indicates a higher energy density, and a lighter shade indicates a lower energy density. In some aspects, the computer system may visually display the energy density map 300 to a user (e.g., on a screen) to allow the user to identify potentially critical sections of the object to be built (e.g., areas with a too low or high energy density) .
    In some embodiments, the computer system determines, in addition to or instead of estimating the amount of energy to be applied to each area of the building material layer based on the scan pattern and operating parameters of the energy source, and optional dynamic behavior of the energy source, as discussed, the actual amount of energy applied to each area. For example, the computer system can determine the actual amount of energy applied to each area to use it as a quality check of a actually built component, as a check on the operation of the additive production allowance, to test if the work file needs to be adjusted if the estimated amount is different of the actual amount for successive copies of an article, etc .; In some embodiments, (e.g., storing, monitoring, etc.) a control system of an additive product appliance determines an actual position and / or speed of the energy source, and optionally an actual power of the energy source, in the course of time during the construction process while the object is built. The control system can provide information about the position, duration and / or speed of application of the energy to the computer system. The computer system then determines the amount of energy actually applied to each area of the building material based on the power source's power and the duration and I or speed of applying the energy to each area, to determine the amount of energy applied was in every area of the building material. The computer system can then generate an energy density map for the layer as discussed here. Such energy density maps based on information collected during the actual building of the object can be examples of energy density maps that are set up after building.
    In some aspects, energy density maps are generated for an object both before and after building. The post-build energy density maps can be compared by a computer system to the post-build energy density maps to identify deviations between the different energy density maps, in some aspects, the deviations can be used by a computer system to determine if the additive production device is malfunctioning. Large deviations can for example be due to errors with the additive production device.
    Figure 4 illustrates exemplary operations 400 for generating an energy density map for a layer of an object, in accordance with certain aspects of this description. In 405 word! receive a digital representation of the layer of the object. For example, a computer system may receive a work file comprising a plurality of cuts of a digital representation of the object. Each cut can represent a layer of the object. Furthermore, each cut can indicate a scan pattern (e.g., scan lines to direct an energy source to building material to build the layer of the object) for the layer of the object, in 410, the operating parameters of an energy source to build the object are determined. The computer system may, for example, determine one or more operating parameters of the energy source, as discussed. Furthermore, in 415, an energy density map of the layer of the object is generated based on the operating parameters of the energy source, and the scan pattern of the layer of the object. The energy density map indicates an amount of energy from the energy source per surface building material that is applied to the building material for the layer of the object, in some aspects the energy density map is further generated based on dynamic behavior of the energy source and / or the actual position of the energy source. energy source while the object is being built.
    In some embodiments, the computer system may have a 3D energy flow! (e.g., voxel model) generate based on the 2D energy density maps that are generated for each layer of an object. For example, the computer system can "stack" the energy density maps corresponding to each layer of the object to generate a 3D energy mode of the object. In some aspects, the computer system may visually display the 3D energy model to a user (e.g., on a screen) to allow the user to view potentially critical sections of the object to be built (e.g., areas with too low or too high energy density). identify. Figure 5 illustrates an example of a visual representation of a 3D energy node! of an object.
    The computer system may further use the 2D energy density maps and / or the 3D energy model of the object to identify critical sections (e.g., sections where possible errors occur during building) of the object (e.g., areas or volumes). The computer system may, for example, use the 2D energy density maps and / or the 3D energy modes of the object to identify sections (eg 2D areas or 3D volumes) of the object that may not meet the required quality and / or sections with geometric non-conformities . in one example, the computer system may use the 2D energy density maps and / or the 3D energy modes of the object to determine a probability that a given section of the object contains an error, in some aspects the computer system may feature a section as a critical section if the probability that the given section of the object contains an error, is above a threshold value.
    In some embodiments, the computer system may further use the 2D energy density maps and / or the 3D energy modes of the object to assist in building such identified critical sections of the object. For example, the application of energy from the energy source to the building material at identified critical sections of the object can be adjusted. For example, the scan pattern, the power source power, the speed at which the power source is moved during scanning, the beam shape of the power source, the beam size, a spin voltage, and / or a current intensity of the power source can be adjusted in some embodiments. the scan pattern can be adjusted by changing the work file (eg using more or fewer scan lines) at identified critical sections of the object, in some embodiments applying energy from the energy source to the building material at identified critical sections can be automatically adjusted by using calculated probabilities of errors, or deviations from threshold values as an input to a function that calculates or adjusts the application of energy from the energy source.
    In some embodiments, the probability that sections of an object to be built (e.g., based on a work file) may include an error (e.g., possible defects or errors) can be determined using the 3D energy model of the item. For example, in some aspects the 3D energy model is a digital representation of a volume of the object. The computer system can divide the volume of the 3D energy model into a multitude of sections or areas, each with its own volume. The plurality of areas can each have the same volume, or they can have different volumes. The computer system can then determine for each area of the plurality of areas a probability that the area contains an error, in some embodiments, the computer system identifies the area as critical area if the probability for an area is above a threshold value, In some embodiments the computer system calculates the total amount of energy per volume in a given area based on the 3D energy model. For example, the amount of energy for each area in the given area is calculated and divided by the total volume of the area. The computer system then compares the amount of energy per volume with at least one threshold value. If, for example, the amount of energy per volume of the area is below a first threshold value for the energy quantity, then it is possible. area may have a potential defect and be identified as a critical area, in another example, if the amount of energy per volume of the area is above a second threshold for the energy amount (different from the first threshold for the amount of energy), a possible defect be identified as a critical area. In some aspects, the first threshold value and / or the second threshold value may be the same for all areas of the article. For example, a lower limit and / or an upper limit for the energy quantity can be determined in order to guarantee a specific quality of the object. In some aspects, the first threshold value and / or the second threshold value may be different for each area of the 3D energy model. The threshold values for an area may, for example, be adaptive and be based on the total amount of energy per volume in areas near (e.g. adjacent to) the given area.
    In some aspects, instead of immediately marking an area as a critical area, the computer system uses the comparison to identify areas based on the total amount of energy per volume in the given area with one or more threshold values. is a potentially critical area. In some aspects, the computer system then determines a probability that a potentially critical area contains an error. For example, the computer system determines the probability that the potentially critical area contains an error based on one or more of the following factors: the volume of the area, an aspect ratio of the area, amounts of energy in surrounding areas, and the amount of energy in the given area. The computer system can, for example, determine the probability as a weighted calculation based on these factors.
    For example, for areas that have been determined to have a total amount of energy per volume below a threshold, the probability assigned is higher as the volume of the area is larger, and lower as the volume of the area is smaller. For example, a larger volume may have a higher probability that there is a defect in the volume, in another example, the assigned probability, for areas that were determined to have a total amount of energy per volume below a threshold value, is higher as the width-to-height ratio of the area is smaller (e.g., smaller inequality between the values of different sizes of the area), and lower as the width-to-height ratio of the area is larger. For example, a needle-like region may have a lower probability of failure than a spherical region. In a further example, for areas that have been determined to have a total amount of energy per volume greater than a threshold value, the probability assigned is lower as the amount of energy in surrounding areas is greater {e.g. in a shell-shaped area with a certain thickness around the area), and higher as the amount of energy in surrounding areas is smaller. In another example, for areas that are determined to have a total amount of energy per volume greater than a threshold value, the probability assigned is higher the smaller the amount of energy per volume in the given area, and the lower the amount of energy. per volume is greater in the given area. For areas that have been determined to have a total amount of energy per volume that is greater than a threshold value, the probability is, for example, higher as the volume of the area is larger and lower. the smaller the volume of the area. For example, a larger volume may have a higher probability that there is a defect in the area. Sn Another example is the assigned probability, for areas that have been determined to have a total amount of energy per volume above a threshold value, the higher the smaller the aspect ratio of the area is (e.g., smaller inequality between the values of different sizes of the area), and lower the greater the aspect ratio of the area. For example, a needle-like region may have a lower probability of failure than a spherical region. In a further example, in some cases the assigned probability, for areas that have been determined to have a total amount of energy per volume above a threshold value, is higher the greater the amount of energy in surrounding areas (e.g., in a shell-shaped area with a thickness around the area), and lower as the amount of energy in surrounding areas is smaller. In another example, for areas that are determined to have a total amount of energy per volume above a threshold value, the probability assigned is lower as the amount of energy per volume in the given area is smaller, and higher as the amount of energy per volume in the given area is larger.
    In some aspects, the probabilities for each area can be stored by the computer system and displayed to a user. In some aspects, the probabilities for each area can be compared to a threshold value, and if the probability for an area is above a threshold value, the computer system identifies the area as being a critical area.
    In some embodiments, the computer system can identify potentially critical areas of an object based on the 2D energy density maps of the object. For example, calculations similar to those performed by the computer system for the 3D energy modes can be performed instead in 2D using the 2Ö energy density maps.
    (3) In some embodiments, the computer system determines the total amount of energy per area in a given section of a layer based on the 2D energy density map of the layer, and the computer system then compares the amount of energy per area with at least one threshold value. if the amount of energy per area of the section is below a first threshold for the energy quantity, then the section may contain a possible defect and may be characterized as a critical area, in another example, if the amount of energy per area of the section exceeds a second threshold value for the energy quantity Hot (different from the first threshold value for the energy quantity) may contain a possible defect and may be characterized as a critical section In some aspects, the first threshold value and / or the second threshold value may be the same for all sections of the layer of the object For example, a lower limit and I or an upper limit for the energy quantity hero are determined to guarantee a specific build quality of the object. In some aspects, the first threshold value and / or the second threshold value may be different for each section of the 2D energy density map. For example, the threshold values for a section may be adaptive and based on the total amount of energy per area in sections near (e.g. adjacent to) the given section.
    In some aspects, instead of immediately characterizing a section as a critical section based on the comparison of the total amount of energy per area in the given section, the computer system uses one or more thresholds to identify sections is a potentially critical section. In some aspects, the computer system then determines a probability that a potentially critical section contains an error. For example, the computer system determines the probability that the potentially critical section contains an error based on one or more of the following factors: the area of the section, amounts of energy in surrounding sections, and the amount of energy in the given section. The computer system can determine the probability, for example, as a weighted calculation based on these factors. For example, the assigned probability is higher as the area of the section is larger, and lower as the area of the section is smaller. For example, a larger area may have a higher probability of a defect in the area. In a further example, the calculated probability is lower as the amount of energy in surrounding sections is larger (e.g. in a shell-shaped section with a certain thickness around the section), and higher as the amount of energy in surrounding sections is smaller. For example, if the amount of energy in surrounding sections is larger, this could partially compensate for a smaller amount of energy in the given section. In another example, the assigned probability is higher the smaller the amount of energy per area in the given section, and lower the greater the amount of energy per area in the given section.
    In some aspects, the probabilities for each section can be stored by the computer system and displayed to a user. In some aspects, the probabilities for each section can be compared to a threshold value, and if the probability for a section is above a threshold value, the computer system identifies the section as being a critical section.
    Figure 6 illustrates exemplary operations 600 for identifying critical sections in an article, in accordance with certain aspects of this description. In 605, a digital representation of the amount of energy to be applied to the object is received. For example, a computer system can receive a 3D energy model of the object and / or a 2D energy density map of a layer of the object. In 610, the digital representation of the amount of energy to be applied to the object is subdivided into sections. The computer system can use the 3D energy mode! of the object and / or a 2D energy density map, for example, into sections with specific volumes or areas. In 615, a probability is determined that a section is a critical section. As discussed, the probability that a section is a critical section can be determined, for example, based on one or more factors, such as comparing the amount of energy per volume or area of the section with one or more threshold values. In 620, all sections whose probability of being a critical section is above a threshold value are identified as a critical section. In some embodiments, the probability that sections of an object to be built (e.g., based on a work file) may be a error contain (eg, possible defects or errors) are determined using the 3D energy model of the object to predict the actual dimensions of the object when it is built by the additive product appliance. For example, the computer system can predict the actual dimensions of the object to be built based on the 3D energy model of the object by adjusting a digital representation of the object (eg in different spatial directions) based on the amount of energy that is applied to the object, in some aspects the dimensions of the representation of the object can also be adjusted (eg XY ~ adjustment applied) to correct the thermal effect of the production. Any section whose dimensions are adjusted beyond the design limits of the object can be identified as being a geometric non-conformity corresponding to a critical section.
    In some embodiments, the computer system may further use the 2D energy density maps and / or the 3D energy modes of the object to adjust the building of identified critical sections of the object. For example, the application of energy from the energy source to the building material at identified critical sections of the article can be trimmed. For example, the scan pattern. the power of the energy source, the speed at which the energy source is moved during scanning, the beam shape of the energy source, the radius of the energy source, a spin voltage and ƒ or a current intensity of the energy source are exposed. In some embodiments, the scan pattern can be adjusted by changing the work file (e.g., using more or fewer scan lines) at identified critical sections of the object. In some embodiments, the application of energy from the energy source to the building material at identified critical sections can be automatically adjusted. For example, in sections (or for one or more vectors of these sections) that have been identified as having a low energy density (e.g., the amount of energy per volume or area is below a first threshold value), one or more additional vectors may be added to the scan pattern (or the scan patterns) for that section, one or more vectors of the scan pattern (or scan patterns) can be extended, one or more vectors of the scan pattern (or scan patterns) can be distributed, the power of the energy source for scanning of the section can be increased, the speed at which the energy source is moved can be lowered in the section, the beam size (e.g. the diameter) of the energy source can be adjusted (eg to concentrate more energy per surface area), the beam shape can can be changed (eg to concentrate more energy per surface area), the current intensity can be changed (eg increased), and / or ng can be changed (e.g. increased), in sections (or for one or more vectors of these sections) identified as having a high energy density (e.g., the amount of energy per volume or area is above a second threshold value), one or more vectors can be removed or shortened in the scan pattern (or the scan patterns) for that section, one or more vectors of the scan pattern (or the scan patterns) can be divided, the power of the energy source for scanning in the section can be reduced, the speed at which the energy source is moved in the section can be increased, the beam size (e.g., the diameter) of the energy source can be increased (e.g., to concentrate less energy per area), the beam shape can be changed (e.g., to concentrate less energy per area), the current intensity can be changed (e.g. reduced), and / or the acceleration voltage can be changed (e.g. reduced).
    By way of example, Fig. 7Ά illustrates an example of a visual preposition of an energy density map for a layer of an object prior to assisting in building identified critical sections of the object. Figure 7B illustrates an example of a visual representation of an energy density map for a layer of an object after adjusting the construction of identified critical sections of the object. All lines in the energy density cards represent scan lines. As shown, the scan lines were adjusted between Figure 7A and Figure 7B. in the circled area 705, for example, additional scan lines were added to the energy density map of Figure 7B. Furthermore, in the encircled area 710 scan lines were removed from the energy density map of Figure 7B, In some aspects, where an identified critical section of an object to be constructed includes a difference between the predicted actual dimensions of the object after being constructed by the additive production allowance, and dimensions of the digital representation (eg CAD file, working file, etc,} of the object, the application of energy from the energy source to the building material. The height of identified critical sections of the object are adjusted in such a way that the predicted actual dimensions of the object after construction better match the dimensions of the digital representation of the object.
    In some aspects, determining energy density maps for an object to be built can be used to reduce a scan time to actually build the object. For example, a plurality of scanning strategies for the object can be generated by a computer system. A scanning strategy for the object can include a scan pattern for each layer of the object. Different scanning strategies can have different scanning patterns for one or more layers of the object than any other. The time required to build the object using any scanning strategy can be calculated by a computer system. Furthermore, the energy density maps for each scanning strategy can be generated by a computer system. Accordingly, each scan strategy includes an associated scan time and an associated set of energy density maps (and optionally a 3D energy model). One of the scanning strategies to actually build the object can be selected based on a quality / uniformity of its energy density maps, and the scan time. in some aspects. for example, some uniformity may be sacrificed to achieve a shorter scanning time. In some aspects, some time may be sacrificed for uniformity. In some aspects, the strategy with the shortest scanning time is selected and critical sections are adjusted as discussed here.
    Embodiments of the invention can be implemented within a system for designing and building 3D objects. Figure 8 shows an example of a computer environment suitable for implementing the design and production of objects. The environment includes a system 800. The system 800 includes one or more computers 802a-802d, which may be, for example, any workstation, server, or other computer equipment capable of processing information. In some aspects, any computer 802a-802d may be connected to a network 805 via any suitable communication technology (e.g., an internet protocol). the Internet). Accordingly, the computers 8Q2a-802d can exchange data (e.g., software, digital representations of 3D objects, commands or instructions to control an additive product device, etc.) via the network 805.
    The system 800 further comprises one or more auditory production devices (e.g., 3D printers) 8G8a-808h. As shown, the additive production accessory 808a is directly connected to a computer 802d (and via computer 8G2d connected to computers 802a ~ 802c via the network 805) and additive production allowance 808b is connected to the computers 8G2a-802d via the network 805. Accordingly, those skilled in the art understand that an additive production device 808 can be directly connected to a computer 802, can be connected to a computer 802 via a network 805, and / or can be connected to a computer 802 via another computer 802 and the network 805.
    It should be noted that how! the system 800 is described with regard to a network and one or more computers, the techniques described here also apply to a single computer 802, which may be directly connected to an additive production test! 808. Any computer 802a-8Ö2d may be configured to operate as the computer system and / or control described in connection with Figures 1 to 7. Furthermore, any computer 802a-8Q2d may be configured to perform the operations described here. including the operations 400 and 600 described in connection with FIGS. 4 and 6. FIG. 9 illustrates a functional bio-diagram of one example of a computer of FIG. 8. The computer 802a includes a processor 910 which is in data communication with a memory 920, an input device 930 and an output test! 940. In some embodiments, the processor is also in data communication with an optional network interface card 990. Although described separately, it is to be understood that functional blocks described with respect to computer 502a should not be separate structural elements. The processor 91 and memory 920 may, for example, be implemented on a single chip.
    The processor 910 may be a general-purpose processor, a digital signal processor [DSP], an integrated circuit for a specific application (ASIC - Application Specific integrated Circuit), a field-programmable gate array (FPGA - Field Programmable Gate Array ) or another programmable device, a processing device with separate ports or transistors, separate hardware components, or any suitable combination thereof designed to perform the functions described herein. A processor can also be implemented as a combination of computer equipment, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors together with a DSP core, or any other similar configuration.
    The processor 910 may be connected, via one or more buses, to a memory 920 to read or write information. The processor may additionally, or alternatively, include a memory such as processor registers. The memory 920 may include processor cache comprising a multi-level hierarchical cache with different levels having different capacities and access speeds. The memory 920 may also include a random access memory (RAM), other volatile storage units, or non-volatile storage units. The storage may include hard disks, optical disks such as CDs or DVDs, flash memory, floppy dises, magnetic tapes, and Zip drives. The processor 910 may also be connected to an input device 930 and an output device 940 to receive input from, respectively. and provide output to a user of the computer 802a. Suitable Input Devices include, but are not limited to. a keyboard, buttons, keys, switches, a pointing device, a mulch, a joystick, a remote control, an infrared detector, a barcode reader, a scanner, a video camera (possibly linked to image processing software to detect, for example, hand or face movements), a motion detector, or a microphone (optionally coupled to geluld Processing software to, for example, detect voices). Suitable output devices include, but are not limited to, visual output devices, including screens and printers, audio output devices, including speakers, headphones, earphones, and alarms, additive production devices, and haptic output devices.
    The processor 910 may further be connected to a network interface card 990. The network interface card 990 prepares data generated by the processor 910 for transfer over a network in accordance with one or more data transfer protocols. The network interface card 990 also decodes data received over a network in accordance with one or more data transfer protocols. The network interface card 990 can include a sender, a receiver, or both. In other embodiments, the transmitter and the receiver can be two separate parts. The network interface card 990 can be implemented as a general-purpose processor, a digital signal processor (DSP), an integrated circuit for a specific application (ASIC - Application Specific Integrated Circuit), a field-programmable gate array (FPGA - Field Programmable Gate Array) or another programmable device, a processing unit with separate ports or transistors, separate hardware components, or any suitable combination thereof designed to perform the functions described herein.
    Figure 10 Illustrates a method 1000 for producing a 3D object or component. As shown, In step 1005, a digital representation of the object is designed using a computer, such as computer 802a. For example, 2D or 3D data can be entered into the computer 802a to aid in designing the digital representation of the 3D object. In step 1010, information from the computer 802a is sent to an additive production allowance, such as additive production allowance 808, and the allowance 808 starts the production process in accordance with the received information, in step 1015, the additive production allowance 808 continues to produce the 3D article using suitable materials, such as a liquid resin. in step 1020, the article is finally constructed. These suitable materials may include, but are not limited to, the following: a photopolymeric resin, polyurethane, methyl methacrylate-acrylSonitrile-butadiene-styrene copolymer, resorbable materials such as polymer-ceramic composites, etc. Examples of commercially available materials are: the range of DSM Somos® materials 7100, 8100, 9100, 9420, 10100, 11100, 12110, 14120 and 15100 from DSM Somos; Stratasys ABSpius ~ P430, ABSi, ABS-ESD7, ABS-M3Ö, ABS-M30L PC-ABS, PC-ISO, PC, ULTEM 9085, PPSF and PPSU; the range of materials Accura Plastic, DuraForm, CastForm, Laserform and VisiJet from 3 ~ Sysiems; PA, PrimeCast and PrimePart materials, and Alumide and CarbonMide from EOS GmbH, VisiJet from 3 Systems. Visijet Flex, Vlsijet Tough, Vlsijet Clear, Visijet HiTemp. Visite e-stone, Vlsijet Black, Visijet You do include, Visijet FTi, etc. Examples of other materials may include Objet materials, such as Objet Fuilcure, Objet Veroclear, Objet Digital Materials, Objet Duruswhite, Objet Tangobiack, Objet Tangopius, Objet Tangoblackplus, etc. Another example of materials may include materials from the Renshape 5000 and 7800 ranges. Furthermore, in a step 820, the 3D object is generated. Various embodiments described herein provide for the use of a control or computer control system. A person skilled in the art will readily appreciate that these embodiments can be implemented using numerous different types of computer systems, including both computer system environments and configurations for general use and / or for specific applications. Examples of well-known computer systems, environments, and / or configurations that may be suitable for use in connection with the embodiments set forth above may include, but are not limited to: personal computers, servers, portable devices, or laptops , multi-processor systems, microprocessor-based systems, programmable consumer electronics, network PCs, mini-computers, mainframes, distributed computing environments comprising any of the aforementioned systems or devices, and the like. These devices may contain stored instructions which, when executed by a microprocessor in the computer device, cause the computer to perform the specified actions to execute the Instructions. As used herein, instructions refer to computer-implemented steps for processing information in the system. Instructions can be implemented in software, firmware or hardware and include any type of programmed step performed by system components.
    A microprocessor can be any conventional general-purpose microprocessor with one or more chips such as a Pentium® processor, a Pentium® Pro processor, an 8051 processor, an MIPS® processor, a Power PC © processor, or an Alpha © processor. Additionally, the microprocessor can be any conventional microprocessor for specific applications such as a digital signal processor or a graphics processor. The microprocessor typically has conventional address lines. conventional data lines, and one or more conventional control lines.
    Aspects and embodiments of the inventions described herein can be implemented in the form of a method, device or production item using standard programming or design techniques to produce software, Urm ware, hardware or any combination thereof. The term "production item" as used herein refers to code or logic implemented in hardware or In non-perishable computer-readable media such as optical storage units, and volatile or non-volatile memory devices or perishable computer-readable media such as signals, carriers such as FPGAs (Field Programmable Gate Array), ASICs (Application Specific Integrated Circuit), CPLDs (complex programmable log arcys), PLAs (programmable log arcys), microprocessors or other similar processing fee devices .
    Figure 2 where, tr = rise time = setup time (typically to within 2-5%) delta x = total displacement T, fd = period and frequency - damped b = overshoot td = waiting time tp = time to first peak
    Ess - error in stationary state NOTE: NOT ON SCALE Figure 4 405 Receive digital representation of layer of object 410 Determine operating parameters of energy source for building the object 415 Generate energy density map for the layer based on tensioning pattern and operating parameters
    Figure 6 605 Receive digital representation of the amount of energy to be applied to the object 610 Divide digital representation into sections 615 Determine probability that each section is a critical section 620 Determine critical sections based on comparison of probability with a threshold value
    Figure 7
    Energy density card
    Figure 9 910 Processor 920 Memory 930 Input Type 940 Output Device 960 Network Interface Card
    权利要求:
    Claims (14)
    [1]
    CONCLUSIONS
    A method of building an object using additive production, the method comprising the following: receiving a work file to build the object, the work file comprising a plurality of cuts of the object, and wherein a first cut of the object indicates scan lines to direct an energy source to building material to build up the first cut of the object; determining operating parameters of the energy source; and generating a first energy density map of the first cut of the article based on the work file and operating parameters of the energy source, wherein the first energy density map indicates an amount of energy from the energy source per surface building material directed to the building material for the first cut of the object. according to claim 1, wherein the energy source comprises a laser or electron beam, and wherein the operating parameters of the energy source comprise at least one of the following: an energy source power, a scanning power source speed, an energy source beam shape, a cream strength and a sputtering voltage.
    [2]
    The method of claim 1, wherein the scan lines comprise vectors indicating positions and directions to direct the energy source onto the building material fe.
    [3]
    The method of claim 1, further comprising: determining dynamic behavior of the energy source, wherein dynamic behavior comprises at least one of the following: a rise time, a set-up time, a waiting time, a cut-off time, and a delay time of the energy source along the scan lines and wherein the generation of the first energy density map of the object is further based on the dynamic behavior of the energy source. ,,, 5. The method of claim 1, further comprising: building the object based on the work file; and storing positions of the energy source in the course of time during the boiling of the object, wherein the generation of the first energy density map of the object is furthermore based on the positions of the energy source in the course of time.
    [4]
    The method of claim 1, further comprising: generating a plurality of energy density maps from the plurality of cuts of the object based on the work file and the operating parameters of the energy source; generating a three-dimensional energy distribution of the object based on the plurality of energy density maps; and determining a potential non-conformity in building the object when a portion of a volume of the three-dimensional energy distribution has an energy level that is below a first threshold value and / or above a second threshold value.
    [5]
    The method of claim 6, further comprising: adjusting the directing of the energy source to building material corresponding to the part of the volume of the three-dimensional energy distribution based on determining the potential non-compliance, wherein adjusting the aligning the energy source includes at least one of the following: adjusting the scan lines, adjusting an energy source power, adjusting an energy source speed, adjusting an energy source beam shape, and tracking a beam size of the energy source.
    [6]
    The method of claim 8, further comprising: estimating geometric non-conformities of the object based on the three-dimensional energy distribution; and adjusting the alignment of the energy source on building material corresponding to the estimated geometric non-conformities, wherein adjusting the alignment of the energy source comprises at least one of the following: adjusting the scan lines, adjusting an output power of the energy source, adjusting a speed of the energy source, adjusting a beam shape of the energy source, and adjusting a beam size of the energy source.
    [7]
    The method of claim 6, wherein determining a potential non-compliance is further based on at least one of the following: a volume of the part, a aspect ratio of the part, and energy levels in other parts of the volume.
    [8]
    The method of claim 1, further comprising determining a potential nonconformity in building the object when a portion of a region of the first energy density map has an energy level that is below a first threshold value and / or above a second threshold value.
    [9]
    The method of claim 10, further comprising adjusting the directing of the energy source to building material corresponding to the part of the area of the first energy density map based on determining the potential non-compliance, wherein adjusting directing the energy source comprises at least one of the following: adjusting the scan lines, adjusting an energy source power, adjusting an energy source speed, adjusting an energy source beam shape, and adjusting a beam size of the energy source.
    [10]
    The method of claim 10, further comprising adjusting the directing of the energy source to building material corresponding to a particular geometric non-conformity wherein adjusting directing the energy source comprises at least one of the following: adjusting the scanning lines, adjusting an energy source power, adjusting an energy source speed, adjusting an energy source beam, and adjusting an energy source radius,
    [11]
    The method of claim 11, wherein adjusting the power source alignment comprises adjusting the scan lines, comprising trimming, extending, adding or removing vectors from the scan lines.
    [12]
    An apparatus for building an object using additive production, the apparatus comprising the following: a memory: and a processor adapted to: receive a work file to build the object, the work file having a plurality of cuts of the article, and wherein a first cut of the article indicates scan lines to direct an energy source to building material to build up the first cut of the article; determining operating parameters of the energy source; and generating a first energy density map of the first cut of the article based on the work file and operating parameters of the energy source, the first energy density map indicating an amount of energy from the energy source indicating per surface building material directed to the building material for the first cut of the object.
    [13]
    An apparatus for building an object using additive production, the apparatus comprising: means for receiving a work file to build the object, the work file comprising a plurality of cuts of the object, and wherein a first cut of the object scan lines indicated to establish an energy source to build up material to build up the first cut of the object; means for determining operating parameters of the energy source; and means for generating a first energy density map from the first cut of the. object based on the work file and operating parameters of the energy source, wherein the first energy density hero card indicates an amount of energy from the energy source per area of building material directed at the building material for the first cut of the object.
    [14]
    A computer-readable storage medium on which instructions are stored for performing a method of building an object using additive production, the method comprising: receiving a work file to build the object, the work file being a plurality includes cuts of the article, and wherein a first cut of the article indicates scan lines to direct an energy source to building material to build up the first cut of the article; determining operating parameters of the energy source; and generating a first energy density map of the first cut of the object based on the work file and the operating parameters of the energy source, wherein the first energy density map indicates an amount of energy from the energy source per surface building material directed to the building material for the first cut of the object.
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    法律状态:
    2018-03-21| FG| Patent granted|Effective date: 20180313 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201662400392P| true| 2016-09-27|2016-09-27|
    US62400392|2016-09-27|
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