Laser additive manufacturing control method, electronic device, and computer-readable storage medium

Abstract

The present application provides a laser additive manufacturing control method, electronic device and computer-readable storage medium, which relate to the field of additive manufacturing. The method includes: controlling the deflection of the galvanometer mirror so that the laser beam emitted by the laser melts the powder on the printing substrate to perform additive printing on the printing substrate; obtaining an additive manufacturing image of the powder melted by the galvanometer mirror deflected laser beam collected by the imaging device; based on the additive manufacturing image, the scanning speed of the galvanometer mirror, the state of the laser molten pool and the flame splashing shape can be analyzed; when at least one of the scanning speed of the galvanometer mirror, the state of the laser molten pool and the flame splashing shape does not meet the preset requirements, adjusting the scanning speed of the galvanometer mirror and / or the parameters of the laser. The present application can realize feedback adjustment of the galvanometer mirror deflection, laser, etc. during the laser additive printing process, thereby improving the quality of laser printing.

Description

Technical Field

[0001] The present application relates to the field of additive manufacturing technology, and in particular to a laser additive manufacturing control method, electronic equipment, and computer-readable storage medium. Background Art

[0002] Laser additive manufacturing is an advanced manufacturing and processing technology that uses laser as a heat source and powder or wire as the deposition raw material. It generates a molding path based on a 3D model and prints layer by layer, ultimately creating a 3D product.

[0003] Existing laser additive manufacturing equipment can print layer by layer according to pre-set printing parameters. If defects appear in the currently printed product, the user needs to manually adjust the laser additive manufacturing equipment parameters. Due to the delay in manual adjustment, the accuracy of the printed three-dimensional product is limited. Summary of the Invention

[0004] In view of the above, the present application provides a laser additive manufacturing control method, an electronic device, and a computer-readable storage medium, which can implement feedback adjustment during the laser additive printing process and improve the laser printing quality.

[0005] One embodiment of the present application provides a laser additive manufacturing control method, which is applied to a laser additive manufacturing device, wherein the laser additive manufacturing device includes a galvanometer, a laser, a printing substrate, and an imaging device. The method includes: controlling the deflection of the galvanometer so that the laser beam emitted by the laser melts the powder on the printing substrate to perform additive printing on the printing substrate; obtaining an additive manufacturing image captured by the imaging device, in which the galvanometer deflects the laser beam to melt the powder; obtaining a scanning speed of the galvanometer based on analysis of the additive manufacturing image; and when the difference between the scanning speed and a preset scanning speed is greater than a preset value, adjusting the scanning speed of the galvanometer based on the difference.

[0006] In some embodiments, the method further includes: obtaining splash information of the laser beam melting the powder based on the additive manufacturing image analysis, the splash information including the spark splash degree and / or spark color; and adjusting the parameters of the laser based on the splash information.

[0007] In some embodiments, adjusting the parameters of the laser based on the spatter information includes: when the spark spatter degree is less than a preset spatter degree and / or the color information of the spark color is preset color information, increasing the power of the laser and / or reducing the spot of the laser beam.

[0008] In some embodiments, the method further includes: outputting a first alarm message when the spark splashing degree is less than a preset splashing degree and / or the color information of the spark color is preset color information.

[0009] In some embodiments, the method further includes: obtaining the continuity of the melt path of the laser beam melting the powder based on the additive manufacturing image analysis; when the melt path continuity does not meet the preset melt path requirements, adjusting the scanning speed of the galvanometer and / or adjusting the power of the laser.

[0010] In some embodiments, the method further includes: outputting a second alarm message when the melt path continuity does not meet the preset melt path requirement.

[0011] In some embodiments, obtaining the continuity of the melt path of the powder melted by the laser beam based on the additive manufacturing image analysis includes: filtering and binarizing the additive manufacturing image to extract the contour of the melt path of the powder melted by the laser beam.

[0012] In some embodiments, the imaging device includes a charge coupled device (CCD) module and a thermal imaging module.

[0013] One embodiment of the present application provides an electronic device, which includes a processor and a memory. The memory stores a plurality of computer programs. The processor is configured to implement the steps of the above-mentioned laser additive manufacturing control method when executing the computer programs stored in the memory.

[0014] One embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the above-mentioned laser additive manufacturing control method are implemented.

[0015] The above-mentioned laser additive manufacturing control method, electronic device and computer-readable storage medium can monitor the laser additive printing process and make corresponding feedback adjustments in a timely manner to improve the quality of laser additive printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flowchart of the steps of the laser additive manufacturing control method in one embodiment of the present application.

[0017] Figure 2 It is a structural schematic diagram of a laser additive manufacturing device in one embodiment of the present application.

[0018] Figure 3 Schematic diagram of the structure of an electronic device in one embodiment of the present application.

[0019] Description of main component symbols

[0020] Laser additive manufacturing device 10

[0021] Memory 20

[0022] Processor 30

[0023] Computer Program 40

[0024] electronic device 100

[0025] Galvanometer 101

[0026] Laser 102

[0027] Printing substrate 103

[0028] Imaging device 104 DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. The described implementations are only part of the implementations of the present application, rather than all implementations.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] The laser additive manufacturing control method of the present application can be applied to a laser printing device, or an electronic device (the laser printing device is controlled by the electronic device based on the laser additive manufacturing control method). An electronic device can be a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc. The electronic device can be a computing device such as a desktop computer, a laptop computer, a server, an industrial computer, etc. The electronic device can interact with the user through a keyboard, a mouse, a remote control, a touchpad, or a voice-controlled device.

[0033] Figure 1 This is a flowchart of the steps of an embodiment of the laser additive manufacturing control method of the present application. The laser additive manufacturing control method can be applied to Figure 2 The laser additive manufacturing device 10 is shown. According to different requirements, the order of the steps in the flowchart can be changed, and some steps can be omitted.

[0034] In some embodiments, the laser additive manufacturing apparatus 10 may include a galvanometer 101, a laser 102, a printing substrate 103, and an imaging device 104. The galvanometer 101 can deflect the laser beam in the X and Y directions, directing the laser beam toward any location within the printing area of the printing substrate 103 to perform additive printing on the printing substrate 103. The deflection of the galvanometer 101 can be driven by a galvanometer motor, and the imaging device 104 can be used to capture in real time the dynamic process of the galvanometer 101 deflecting the laser beam to melt powder on the printing substrate 103. The powder can be a metal powder, a non-metallic material powder, a medical biomaterial powder, or the like.

[0035] In some embodiments, the imaging device 104 may include a high-speed CCD module and a high-speed thermal imaging module, so that the additive manufacturing images captured by the imaging device 104 have high definition, high image stability, high transmission capability, and high anti-interference capability.

[0036] The laser additive manufacturing device 10 of the present application can obtain the scanning speed of the galvanometer 101, the laser molten pool state and the flame splashing shape based on the additive manufacturing image analysis collected by the imaging device 104. When it is determined that at least one of the scanning speed of the galvanometer 101, the laser molten pool state and the flame splashing shape does not meet the preset requirements, the scanning speed of the galvanometer 101 and / or the parameters of the laser 102 can be adjusted to achieve feedback adjustment of the galvanometer deflection, laser, etc. during the laser additive printing process, thereby improving the laser printing quality.

[0037] See Figure 1 As shown, the laser additive manufacturing control method may specifically include the following steps.

[0038] Step S11 : controlling the galvanometer mirror 101 to deflect so that the laser beam emitted by the laser 102 melts the powder on the printing substrate 103 , thereby performing additive printing on the printing substrate 103 .

[0039] In some embodiments, the object P1 to be printed and the printing material of object P1 can be specified according to actual needs, and this application does not limit this. For example, a 3D model of object P1 can be designed using model design software such as CAD, and the placement and slicing operations can be set using magics software. Then, a path planning can be performed based on the structural characteristics of object P1. After setting the corresponding printing parameters, the material powder can be spread on the printing substrate 103 using a powder spreading device, and the deflection of the galvanometer 101 can be controlled so that the laser beam emitted by the laser 102 melts the powder on the printing substrate 103 to print the object P1.

[0040] Step S12 : Acquire an additive manufacturing image captured by the imaging device 104 , in which the galvanometer 101 deflects the laser beam to melt the powder.

[0041] In some embodiments, the imaging device 104 may include a high-speed CCD image sensor and a high-speed thermal imaging system. The additive manufacturing image may include deflection information of the galvanometer 101, melting information of the powder, and the like.

[0042] Step S13: Obtaining the scanning speed of the galvanometer mirror 101 based on the additive manufacturing image analysis.

[0043] In some embodiments, when an additive manufacturing image is collected, the scanning speed of the galvanometer 101 can be directly obtained based on the additive manufacturing image analysis. For example, the scanning speed of the galvanometer 101 can be obtained based on the additive manufacturing image analysis in the following manner: for additive manufacturing images arranged in frame order, the most forward point of the galvanometer 101 in the frame image is determined, and the pixel difference between two adjacent frames is obtained, and the pixel difference is set as Pixel diff , get the frame rate FPS, assuming that the ratio of the pixel size of the galvanometer in the frame image to the actual galvanometer size is S, then the scanning speed V of the galvanometer 101 can be expressed as: V = Pixel diff / S*FPS.

[0044] Step S14 : When the difference between the scanning speed and the preset scanning speed is greater than the preset value, the scanning speed of the galvanometer 101 is adjusted based on the difference.

[0045] In some embodiments, the laser additive manufacturing device 10 may further include a memory, which stores a database for storing pre-set galvanometer scanning speeds (preset scanning speeds). The preset value can be set according to actual needs and is not limited in this application.

[0046] The difference between the scanning speed of the galvanometer mirror 101 and the preset scanning speed can be calculated, and it can be determined whether the difference is greater than the preset value. When the difference between the scanning speed and the preset scanning speed is greater than the preset value, the scanning speed of the galvanometer mirror 101 is adjusted based on the difference so that the difference between the scanning speed of the galvanometer mirror 101 and the preset scanning speed is less than the preset value. When the difference between the scanning speed and the preset scanning speed is less than or equal to the preset value, the scanning speed of the galvanometer mirror 101 does not need to be adjusted.

[0047] For example, the difference between the scanning speed of the galvanometer mirror 101 and the preset scanning speed is greater than the preset value, and the scanning speed of the galvanometer mirror 101 is greater than the preset scanning speed, so the scanning speed of the galvanometer mirror 101 is reduced.

[0048] In some embodiments, spatter information from the laser beam melting powder can be obtained based on AM image analysis. The spatter information can include the extent and / or color of the sparks. Laser 102 parameters can then be adjusted based on the spatter information. Laser 102 parameters can include power, spot size, and other parameters. For example, the spark color can be obtained by performing HSV color space processing on the AM image, and the extent of the sparks can be obtained by filtering and binarizing the AM image.

[0049] When the spark spatter level is less than a preset level and / or the spark color information is a preset color information, the power of laser 102 is increased and / or the laser beam spot is reduced. The preset color information may mean that the spark color is reddish. When the spark spatter level is greater than the preset level, the power of laser 102 is reduced.

[0050] In some embodiments, when the spark spattering degree is less than a preset spattering degree and / or the spark color information is a preset color information, a first alarm message may be output. The first alarm message may be in the form of sound, light, text, etc. For example, the laser additive manufacturing device 10 may further include a display screen, which may output a pop-up alarm, or store the first alarm message in a database in the form of a log.

[0051] In some embodiments, the continuity of the melt path of the powder melted by the laser beam can also be determined based on additive manufacturing image analysis. For example, the additive manufacturing image can be filtered and binarized to extract the contour of the melt path of the powder melted by the laser beam to determine the continuity of the powder melt path.

[0052] When the powder melt path continuity does not meet the preset melt path requirements, adjust the scanning speed of the galvanometer 101 and / or adjust the power of the laser 102. For example, when the powder melt path is intermittent, reduce the scanning speed of the galvanometer 101 and / or increase the power of the laser 102.

[0053] In some embodiments, when the melt path continuity does not meet the preset melt path requirements, a second alarm message may be output. The second alarm message may also be in the form of sound, light, text, etc. The laser additive manufacturing device 10 may also save the second alarm message in the form of a log in a database.

[0054] The above-mentioned laser additive manufacturing control method can monitor the laser additive printing process and make corresponding feedback adjustments in a timely manner to improve the quality of laser additive printing.

[0055] Figure 3 This is a schematic diagram of an embodiment of an electronic device of the present application.

[0056] The electronic device 100 includes a memory 20, a processor 30, and a computer program 40 stored in the memory 20 and executable on the processor 30. When the processor 30 executes the computer program 40, the steps in the above-mentioned laser additive manufacturing control method embodiment are implemented, such as Figure 1 Steps S11 to S14 are shown.

[0057] For example, the computer program 40 may also be divided into one or more modules / units, which are stored in the memory 20 and executed by the processor 30. The one or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 40 in the electronic device 100.

[0058] The electronic device 100 may be a computing device such as a desktop computer, a notebook computer, a PDA, an industrial computer, a tablet computer, or a server. Those skilled in the art will appreciate that the schematic diagram is merely an example of the electronic device 100 and does not limit the electronic device 100 . The electronic device 100 may include more or fewer components than shown, or may combine certain components or different components. For example, the electronic device 100 may also include input and output devices, network access devices, buses, and the like.

[0059] The processor 30 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, a single-chip microcomputer, or the processor 30 may be any conventional processor, etc.

[0060] The memory 20 can be used to store computer programs 40 and / or modules / units. The processor 30 implements various functions of the electronic device 100 by running or executing the computer programs and / or modules / units stored in the memory 20 and accessing data stored in the memory 20. The memory 20 may mainly include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area may store data (such as audio data) generated based on the use of the electronic device 100. In addition, the memory 20 may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0061] If the modules / units integrated in the electronic device 100 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed electronic devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely illustrative. For example, the division of the units described is merely a logical function division, and other division methods may be used in actual implementation.

[0063] In addition, the functional units in the various embodiments of the present application may be integrated into the same processing unit, or each unit may exist physically separately, or two or more units may be integrated into the same unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0064] It is obvious to those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. The multiple units or electronic devices stated in the electronic device claim can also be implemented by the same unit or electronic device through software or hardware. Words such as first and second are used to indicate names and do not indicate any particular order.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not limiting. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that the technical solution of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A laser additive manufacturing control method, applied to a laser additive manufacturing device, characterized in that: The laser additive manufacturing device includes a galvanometer, a laser, a printing substrate, and an imaging device, and the method includes: controlling the deflection of the galvanometer mirror so that the laser beam emitted by the laser melts the powder on the printing substrate to perform additive printing on the printing substrate; Acquiring an additive manufacturing image captured by the imaging device, in which the galvanometer deflects the laser beam to melt the powder, wherein the additive manufacturing image is a frame image arranged in a frame sequence; Determining the front-most point of the galvanometer in the frame image; Get the frame rate and the pixel difference between two adjacent frames; A scanning speed of the galvanometer is obtained based on the pixel difference, the frame rate, and a preset size ratio, wherein the preset size ratio is a ratio of a pixel size of the galvanometer in the frame image to an actual size of the galvanometer, and the scanning speed of the galvanometer is calculated as follows: the pixel difference / the preset size ratio×the frame rate; When the difference between the scanning speed and the preset scanning speed is greater than a preset value, the scanning speed of the galvanometer is adjusted based on the difference.

2. The laser additive manufacturing control method according to claim 1, wherein: Also includes: Obtaining, based on the additive manufacturing image analysis, splash information of the laser beam melting the powder, the splash information including spark splashing degree and / or spark color; Parameters of the laser are adjusted based on the spatter information.

3. The laser additive manufacturing control method according to claim 2, wherein: The adjusting the parameters of the laser based on the splash information includes: When the spark splashing degree is less than a preset splashing degree and / or the color information of the spark color is preset color information, the power of the laser is increased and / or the spot of the laser beam is reduced.

4. The laser additive manufacturing control method according to claim 3, wherein: Also includes: When the spark splashing degree is less than a preset splashing degree and / or the color information of the spark color is preset color information, a first alarm message is output.

5. The laser additive manufacturing control method according to claim 1, wherein: Also includes: Obtaining continuity of a melt path of the powder melted by the laser beam based on the additive manufacturing image analysis; When the continuity of the melt path does not meet the preset melt path requirement, the scanning speed of the galvanometer mirror and / or the power of the laser are adjusted.

6. The laser additive manufacturing control method according to claim 5, wherein: Also includes: When the melt path continuity does not meet the preset melt path requirement, a second alarm message is output.

7. The laser additive manufacturing control method according to claim 5, wherein: The obtaining of the continuity of the melt path of the powder melted by the laser beam based on the additive manufacturing image analysis includes: The additive manufacturing image is filtered and binarized to extract the outline of the melt path where the laser beam melts the powder.

8. The laser additive manufacturing control method according to any one of claims 1 to 7, wherein: The imaging device includes a charge coupled device (CCD) module and a thermal imaging module.

9. An electronic device comprising a processor and a memory, wherein the memory stores a plurality of computer programs, wherein: The processor is configured to implement the laser additive manufacturing control method according to any one of claims 1 to 8 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the laser additive manufacturing control method according to any one of claims 1 to 8 is implemented.

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