Galvanometer size precision calibration method

Abstract

The invention relates to a galvanometer size precision calibration method. According to the galvanometer size precision calibration method, laser printing is carried out through additive manufacturing equipment so as to obtain a printing test image; using an automatic identification model to control a CCD camera to identify the coordinate value of each point in the printing test image, and obtaining a coordinate data file; obtaining a galvanometer deviation value according to the coordinate data file and the galvanometer execution file; if the absolute value of the galvanometer deviation value is larger than a preset deviation value, parameters in the galvanometer execution file are calibrated and modified according to the galvanometer deviation value, and then the step that the laser film is attached to the laser galvanometer scanning area of the additive manufacturing equipment and all the following steps are executed again till the absolute value of the galvanometer deviation value is smaller than the preset deviation value. Therefore, in the whole process, large-format pattern printing is not needed, pattern shearing and splicing are not needed, the calibration precision can be improved, the CCD camera recognition platform is easy to disassemble and assemble, the size is small, and the device has the advantages of being convenient to carry and use during after-sales service.

Description

Technical Field

[0001] The invention relates to the technical field of additive manufacturing, and in particular to a method for calibrating the size accuracy of a galvanometer. Background Art

[0002] The laser galvanometer system is one of the most important components in the metal laser selective melting additive manufacturing technology. The accuracy of the galvanometer movement directly determines the size of the printed parts. At the same time, due to multiple factors such as equipment vibration, aging of the galvanometer, changes in the working environment, etc., the accuracy of the galvanometer may also be affected, resulting in unqualified dimensional accuracy of the printed parts. Therefore, accurate calibration of the galvanometer has become an indispensable part of the debugging of metal laser selective melting equipment.

[0003] At present, the most commonly used galvanometer calibration method is to scan a specific pattern on a specific medium and then use a measuring tool to detect the coordinate value of the pattern. However, the existing galvanometer calibration method still has the following technical problems: 1) Coordinate value detection uses a scanner to scan the pattern, but the pattern printed by a large-format device needs to be cut and spliced, which affects the accuracy of the detection; 2) Another method of coordinate value detection is through 2D or other instruments, but some instruments are too large and inconvenient to use when maintaining customer equipment. Summary of the invention

[0004] Based on this, it is necessary to provide a galvanometer size progress calibration method with high calibration accuracy and convenient calibration.

[0005] A method for calibrating the dimensional accuracy of a galvanometer comprises the following steps:

[0006] A CCD camera recognition platform is provided and an automatic recognition model is established; the CCD camera recognition platform comprises a frame, a calibration plate mounting platform mounted on the frame, a movable camera mounting platform mounted on the frame, and a CCD camera mounted on the movable camera mounting platform;

[0007] Laminating the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment;

[0008] Controlling the laser galvanometer system in the additive manufacturing device to print on the upper surface of the laser film to obtain a printed test image by executing a galvanometer execution file;

[0009] Mounting the calibration plate and the laser film printed with the print test image on the calibration plate mounting platform;

[0010] Using the automatic recognition model to control the CCD camera to recognize the coordinate value of each point in the printed test image to obtain a coordinate data file;

[0011] Calculate and obtain a galvanometer deviation value according to the coordinate data file and the galvanometer execution file;

[0012] If the absolute value of the galvanometer deviation value is greater than the preset deviation value, calibrate and modify the parameters in the galvanometer execution file according to the galvanometer deviation value;

[0013] Return to the step of attaching the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment until the absolute value of the galvanometer deviation value is less than or equal to the preset deviation value.

[0014] In one embodiment, before the step of installing the calibration plate and the laser film printed with the print test image on the calibration plate installation platform, the step further includes:

[0015] The positions and postures of the calibration plate mounting platform and the movable camera mounting platform are adjusted until the calibration plate mounting platform is parallel and aligned with the movable camera mounting platform.

[0016] In one embodiment, after the step of adjusting the position and posture of the calibration plate mounting platform and the movable camera mounting platform, the method further includes: establishing a calibration model; mounting the calibration plate on the calibration plate mounting platform; using the calibration model to control the CCD camera to calibrate and identify the calibration plate, and calculating the identification error value of the CCD camera according to the identification result;

[0017] The step of using the CCD camera to identify the coordinate values ​​of each point in the printed test image to obtain a coordinate data file includes: using the CCD camera to identify the coordinate values ​​of each point in the printed test image to obtain an identification data file; and calculating the coordinate data file based on the identification data file and the identification error value.

[0018] In one embodiment, the step of placing the calibration plate with the laser film attached thereto in a laser galvanometer scanning area of ​​an additive manufacturing device includes:

[0019] Place the calibration plate in the laser galvanometer scanning area of ​​the additive manufacturing equipment;

[0020] Adjusting the position of the calibration plate so that the upper surface of the calibration plate is flush with the actual sintering surface of the additive manufacturing device;

[0021] Adjust the position of the calibration plate downward to a height consistent with the thickness of the laser film;

[0022] The laser film is placed on a preset position on the upper surface of the calibration plate.

[0023] In one embodiment, after the step of placing the laser film on a preset position on the upper surface of the calibration plate, the method further comprises the following steps:

[0024] Determine whether there are bubbles or warping between the laser film and the calibration plate;

[0025] If not, return to the step of placing the laser film on the calibration plate until there are no bubbles or warping between the laser film and the calibration plate.

[0026] In one of the embodiments, before the step of controlling the additive manufacturing device to perform laser printing on the laser film by executing the galvanometer execution file, the step further includes: setting the number of matrix points and the matrix point interval in the X / Y direction in the galvanometer execution file, and generating a design test image according to the number of matrix points and the matrix point interval in the X / Y direction;

[0027] The step of controlling the additive manufacturing device to perform laser printing on the laser film by executing the galvanometer execution file to obtain the printed test image is: controlling the additive manufacturing device to perform laser printing on the laser film according to the designed test image by executing the galvanometer execution file to obtain the printed test image.

[0028] In one embodiment, before the step of controlling the additive manufacturing device to perform laser printing on the laser film by executing the galvanometer execution file, the step further includes:

[0029] Cleaning the galvanometer scanning area;

[0030] Close the door of the working compartment.

[0031] In one of the embodiments, the preset deviation value is 48 μm to 55 μm.

[0032] In one embodiment, the CCD camera recognition platform also includes a cabinet and a cabinet door; the cabinet is a hollow structure with a door opening at one end; one end of the cabinet door is rotatably connected to the edge of the door opening to open or close the cabinet; and the rack is installed in the cabinet.

[0033] In one embodiment, a hanging ring is provided on the top of the cabinet and a foot pad is provided on the bottom.

[0034] The above-mentioned galvanometer size accuracy calibration method first uses the additive manufacturing equipment to perform laser printing on the laser film in the laser galvanometer scanning area to obtain a printed test image; then uses the automatic recognition model to control the CCD camera to identify the coordinate value of each point in the printed test image, and generates a coordinate data file in sequence; then the coordinate data file and the galvanometer execution file are compared and calculated to obtain the galvanometer deviation value; if the absolute value of the galvanometer deviation value is greater than the preset deviation value, it means that the printing accuracy of the laser galvanometer system no longer meets the printing requirements. At this time, the parameters in the galvanometer execution file can be calibrated and modified according to the galvanometer deviation value, and then return to execute the step of attaching the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment and all subsequent steps until the absolute value of the galvanometer deviation value is less than the preset deviation value, and the galvanometer size accuracy calibration work can be completed.

[0035] In the above-mentioned galvanometer size accuracy calibration method, there is no need to print patterns in a large format, and accordingly there is no need to cut and splice patterns, which is conducive to improving the calibration accuracy. In addition, the CCD camera recognition platform is easy to disassemble and assemble, and is small in size, which is convenient for carrying and using during after-sales service. Therefore, the use of the above-mentioned galvanometer size accuracy calibration method improves the calibration accuracy of the galvanometer calibration and the convenience of the calibration operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0037] Figure 1 A schematic diagram of the flow chart of a method for calibrating the dimensional accuracy of a galvanometer in a preferred embodiment of the present invention;

[0038] Figure 2 for Figure 1 A schematic diagram of the structure of the CCD camera recognition platform used in the galvanometer size accuracy calibration method at one viewing angle;

[0039] Figure 3 for Figure 1 A schematic diagram of the structure of the CCD camera recognition platform used in the galvanometer size accuracy calibration method shown in another perspective;

[0040] Figure 4 for Figure 1 A flow chart of steps S40-1 to S40-3 added before step 40 in the galvanometer size accuracy calibration method shown;

[0041] Figure 5 for Figure 1A schematic flow chart of step S50 in the galvanometer size accuracy calibration method shown;

[0042] Figure 6 for Figure 1 A schematic diagram of the process of step S20 in the galvanometer size accuracy calibration method shown;

[0043] Figure 7 for Figure 1 The flowchart of step S30-1 and step S30-2 added before step S30 in the galvanometer size accuracy calibration method is shown.

[0044] Explanation of reference numerals: 100, CCD camera identification platform; 110, rack; 120, calibration plate mounting platform; 130, movable camera mounting platform; 140, CCD camera; 150, cabinet; 160, cabinet door; 170, lifting ring; 180, foot pad. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0048] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0049] See also Figure 1 The galvanometer size accuracy calibration method in a preferred embodiment of the present invention includes steps S10 to S80.

[0050] Please also read Figure 2 and Figure 3 , step S10, providing a CCD camera recognition platform 100 and establishing an automatic recognition model.

[0051] The CCD camera recognition platform 100 includes a frame 110, a calibration plate mounting platform 120 mounted on the frame 110, a movable camera mounting platform 130 mounted on the frame 110, and a CCD camera 140 mounted on the movable camera mounting platform 130. The movable camera mounting platform 130 is configured to be able to adjust the lateral position of the CCD camera 140.

[0052] Specifically, the rack 110 is a metal telescopic rack 110, the calibration plate mounting platform 120 is located at the bottom of the rack 110, and the movable camera mounting platform 130 is located at the top of the rack 110. The distance between the CCD camera 140 and the calibration plate mounting platform 120 can be adjusted through the metal telescopic rack 110.

[0053] Step S20, placing the laser film in the laser galvanometer scanning area of ​​the additive manufacturing equipment.

[0054] Step S30, controlling the laser galvanometer system in the additive manufacturing equipment to print on the upper surface of the laser film to obtain a print test image by executing the galvanometer execution file.

[0055] Specifically, the galvanometer execution file is used to control the laser galvanometer system in the additive manufacturing equipment to print a calibration pattern on the laser film according to preset instructions, thereby obtaining a printed test image.

[0056] Step S40, the calibration plate and the laser film printed with the print test image are mounted on the calibration plate mounting platform 120. That is, the calibration plate attached with the laser film is mounted on the calibration plate mounting platform 120, and the laser film is printed with the print test image.

[0057] Step S50 , using the automatic recognition model to control the CCD camera 140 to recognize the coordinate value of each point in the printed test image to obtain a coordinate data file.

[0058] Step S60, calculating and obtaining the galvanometer deviation value according to the coordinate data file and the galvanometer execution file. That is, by comparing and calculating the data in the coordinate data file and the data in the galvanometer execution file, the galvanometer deviation value of the laser galvanometer system can be obtained.

[0059] Step S70, if the absolute value of the galvanometer deviation value is greater than the preset deviation value, calibrate and modify the parameters in the galvanometer execution file according to the galvanometer deviation value. If the absolute value of the galvanometer deviation value is greater than the preset deviation value, it is indicated that the galvanometer accuracy of the laser galvanometer system in the additive manufacturing equipment cannot meet the product printing requirements.

[0060] Step S80, returning to the step of attaching the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment until the absolute value of the galvanometer deviation value is less than or equal to the preset deviation value.

[0061] Specifically, in order to ensure that the printing accuracy of the laser galvanometer system of the additive manufacturing equipment can meet the accuracy requirements of most parts, the preset deviation value is 48μm to 55μm.

[0062] By executing steps S10 to S80, the calibration of the galvanometer accuracy of the laser galvanometer system in the additive manufacturing equipment can be achieved. By executing step S10, the assembled CCD camera recognition platform 100 and the automatic recognition model for controlling the CCD camera 140 to automatically recognize the coordinate values ​​of each point in the image are obtained. By executing steps S20 and S30, the original galvanometer execution file of the additive manufacturing equipment is used to control the laser galvanometer system to perform laser printing on the laser film to obtain a printed test image. By executing steps S40 and S50, the automatic recognition model established in step S10 is used to control the CCD camera 140 to automatically recognize the coordinate values ​​of each point in the printed test image, so as to generate a coordinate data file in accordance with the recognition order. By executing step S60, the coordinate data file and the galvanometer execution file in step S30 are compared and calculated to obtain the galvanometer deviation value. By executing step S70, if it is determined that the absolute value of the galvanometer deviation value is greater than the preset deviation value, it means that the printing accuracy of the laser galvanometer system cannot meet the product printing requirements. At this time, the parameters in the galvanometer execution file in step S20 can be calibrated and modified according to the galvanometer deviation value to obtain a new galvanometer execution file, and then by executing step S80, that is, returning to re-execute steps S20 to S70, wherein the calibrated and modified galvanometer execution file is used when executing step S30 until the absolute value of the galvanometer deviation value is less than or equal to the preset deviation value, thereby completing the calibration of the entire galvanometer accuracy.

[0063] It should be noted that, in step S80, steps S20 to S70 are returned and re-executed once or more until the absolute value of the galvanometer deviation value obtained in step S60 is less than or equal to the preset deviation value.

[0064] In the above-mentioned galvanometer size accuracy calibration method, there is no need to print patterns in a large format, and accordingly there is no need to cut and splice patterns. The entire accuracy calibration process is a completed printed test image, which is conducive to improving the calibration accuracy. In addition, the CCD camera recognition platform 100 is easy to disassemble and assemble, and has a small size, which is convenient for carrying and using during after-sales service. Therefore, the use of the above-mentioned galvanometer size accuracy calibration method improves the calibration accuracy of the galvanometer calibration and the convenience of the calibration operation.

[0065] In some embodiments, before step S40, the step of adjusting the position and posture of the calibration plate mounting platform 120 and the movable camera mounting platform 130 is also included until the calibration plate mounting platform 120 is parallel and aligned with the movable camera mounting platform.

[0066] Specifically, the positions and postures of the calibration plate mounting platform 120 and the movable camera mounting platform 130 are adjusted so as to adjust both the calibration plate mounting platform 120 and the movable camera mounting platform 130 to a horizontal state and to be aligned.

[0067] Thus, before executing step S40, the calibration plate mounting platform 120 and the movable camera mounting platform 130 are adjusted to be parallel and aligned with each other to improve the recognition accuracy when executing step S40, so as to obtain a more accurate coordinate data file, thereby further improving the calibration accuracy of the galvanometer calibration.

[0068] Please also read Figure 4 Furthermore, in some embodiments, after the step of adjusting the position and posture of the calibration plate mounting platform 120 and the movable camera mounting platform 130, steps S40-1 to S40-3 are also included.

[0069] Step S40-1, establishing a calibration model.

[0070] Step S40 - 2 , installing the calibration plate on the calibration plate installation platform 120 .

[0071] Step S40 - 3 , using the calibration model to control the CCD camera 140 to perform calibration and recognition on the calibration plate, and calculating and obtaining the recognition error value of the CCD camera 140 according to the recognition result.

[0072] Please also read Figure 5 , step S50 includes step S51 and step S52.

[0073] Step S51 : using the CCD camera 140 to identify the coordinate value of each point in the printed test image to obtain an identification data file.

[0074] Step S52, obtaining a coordinate data file by calculation according to the recognition data file and the recognition error value.

[0075] By executing steps S40-1 to S40-3, the recognition error value of the CCD camera recognition platform 100 is obtained, and the recognition data file obtained in step S51 is a data file containing the coordinate values ​​of each point in the printed test image directly recognized and obtained by the CCD camera 140. By executing step S51, the recognition error value is used to interpolate the recognition data file to obtain a more accurate coordinate data file, thereby eliminating the recognition error of the CCD camera recognition platform 100, which is conducive to further improving the calibration accuracy of the galvanometer calibration.

[0076] In some embodiments, step S20 includes steps S21 to S24.

[0077] Step S21, placing the calibration plate in the laser galvanometer scanning area of ​​the additive manufacturing equipment.

[0078] Step S22, adjusting the position of the calibration plate so that the upper surface of the calibration plate is flush with the actual sintering surface of the additive manufacturing equipment.

[0079] Step S23, the calibration plate is adjusted downward to a height consistent with the thickness of the laser film, that is, the calibration plate is adjusted downward to a height consistent with the thickness of the laser film.

[0080] Step S24, placing the laser film on a preset position on the upper surface of the calibration board.

[0081] The preset position in the above step S24 refers to the actual sintering surface position of the additive manufacturing device, and the height of the preset position is also consistent with the height of the actual sintering surface. By executing steps S21 to S24, by first placing the calibration plate and adjusting the height of the calibration plate, it is ensured that after the laser film is attached to the calibration plate, the upper surface of the laser film can reach the preset printing position, so as to provide a high-precision printed test image for the subsequent galvanometer calibration, so that the calibration accuracy of the galvanometer calibration is higher.

[0082] Furthermore, in some embodiments, after step S24, step S25 and step S26 are also included.

[0083] Step S25, determining whether there are bubbles or warping between the laser film and the calibration plate.

[0084] Step S26: If not, return to execute steps S24 and S25 until there are no bubbles or warping between the laser film and the calibration plate.

[0085] In this way, by executing steps S25 and S26, it is ensured that the laser film can be completely attached to the calibration plate without bubbles, warping and other incomplete attachments, so as to obtain a printed test image with higher printing accuracy, so as to further improve the subsequent galvanometer calibration accuracy.

[0086] In some embodiments, before step S30, the method further includes the steps of setting the number of matrix points and the matrix point interval in the X / Y direction in the galvanometer execution file, and generating a designed test image according to the number of matrix points and the matrix point interval in the X / Y direction.

[0087] Step S30 is: by executing the galvanometer execution file, controlling the additive manufacturing equipment to perform laser printing on the laser film according to the designed test image to obtain a printed test image.

[0088] In this way, the staff can design different design test images according to the actual situation and needs, so as to obtain different printed test images. For example, the staff can obtain the design test image according to the existing conditions at hand, so as to provide different printed test images for the subsequent galvanometer precision calibration to adapt to the galvanometer precision calibration work under different environments and conditions.

[0089] Please also read Figure 7 In some embodiments, before step S30, step S30-1 and step S30-2 are also included.

[0090] Step S30-1, cleaning the galvanometer scanning area.

[0091] Step S30-2, closing the door of the working cabin.

[0092] By executing step S30-1, factors affecting printing accuracy are reduced and the subsequent galvanometer calibration accuracy is improved, and step S30-2 is performed to prevent accidental laser damage and improve the safety of galvanometer calibration.

[0093] Please refer again Figure 2 and Figure 3 In some embodiments, the CCD camera recognition platform 100 further includes a cabinet 150 and a cabinet door 160. The cabinet 150 is a hollow structure with a door opening at one end. One end of the cabinet door 160 is rotatably connected to the edge of the door opening to open or close the cabinet 150. The rack 110 is installed in the cabinet 150.

[0094] The cabinet body 150 and the cabinet door 160 can protect the frame 110, the calibration plate mounting platform 120, the movable camera mounting platform 130 and the CCD camera 140, and the cabinet door 160 can be opened or closed to facilitate the subsequent calibration of the dimensional accuracy of the galvanometer.

[0095] Furthermore, in some embodiments, a hanging ring 170 is disposed on the top of the cabinet 150 , and a foot pad 180 is disposed on the bottom.

[0096] When the CCD camera recognition platform 100 needs to be assembled or disassembled, the staff can transfer or transport the CCD camera recognition platform 100 by hooking the lifting ring 170 using a lifting device, so as to further improve the convenience of carrying and using the CCD camera recognition platform 100 when making fermented bean curd.

[0097] The provision of the foot pad 180 can prevent the cabinet 150 from directly contacting the ground or other placement surfaces, so as to reduce the probability of wear and tear of the cabinet 150 , thereby extending the service life of the CCD camera recognition platform 100 .

[0098] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for calibrating the dimensional accuracy of a galvanometer, characterized in that: Includes steps: A CCD camera recognition platform is provided and an automatic recognition model is established; the CCD camera recognition platform comprises a frame, a calibration plate mounting platform mounted on the frame, a movable camera mounting platform mounted on the frame, and a CCD camera mounted on the movable camera mounting platform; Laminating the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment; Controlling the laser galvanometer system in the additive manufacturing device to print on the upper surface of the laser film to obtain a printed test image by executing a galvanometer execution file; Mounting the calibration plate and the laser film printed with the print test image on the calibration plate mounting platform; Using the automatic recognition model to control the CCD camera to recognize the coordinate value of each point in the printed test image to obtain a coordinate data file; Calculate and obtain a galvanometer deviation value according to the coordinate data file and the galvanometer execution file; If the absolute value of the galvanometer deviation value is greater than the preset deviation value, calibrate and modify the parameters in the galvanometer execution file according to the galvanometer deviation value; Return to the step of attaching the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment until the absolute value of the galvanometer deviation value is less than or equal to the preset deviation value.

2. The galvanometer size accuracy calibration method according to claim 1, characterized in that: Before the step of installing the calibration plate and the laser film printed with the print test image on the calibration plate installation platform, the method further includes the following steps: The positions and postures of the calibration plate mounting platform and the movable camera mounting platform are adjusted until the calibration plate mounting platform is parallel and aligned with the movable camera mounting platform.

3. The galvanometer dimensional accuracy calibration method according to claim 2, characterized in that: After the step of adjusting the position and posture of the calibration plate mounting platform and the movable camera mounting platform, the method further includes: establishing a calibration model; mounting the calibration plate on the calibration plate mounting platform; using the calibration model to control the CCD camera to calibrate and identify the calibration plate, and calculating the identification error value of the CCD camera according to the identification result; The step of using the CCD camera to identify the coordinate values ​​of each point in the printed test image to obtain a coordinate data file includes: using the CCD camera to identify the coordinate values ​​of each point in the printed test image to obtain an identification data file; and calculating the coordinate data file based on the identification data file and the identification error value.

4. The galvanometer dimensional accuracy calibration method according to claim 1, characterized in that: The step of placing the calibration plate with the laser film attached thereto in a laser galvanometer scanning area of ​​an additive manufacturing device comprises: Place the calibration plate in the laser galvanometer scanning area of ​​the additive manufacturing equipment; Adjusting the position of the calibration plate so that the upper surface of the calibration plate is flush with the actual sintering surface of the additive manufacturing device; Adjust the position of the calibration plate downward to a height consistent with the thickness of the laser film; The laser film is placed on a preset position on the upper surface of the calibration plate.

5. The galvanometer dimensional accuracy calibration method according to claim 4, characterized in that: After the step of laminating and placing the laser film at a preset position on the upper surface of the calibration board, the step further includes: Determine whether there are bubbles or warping between the laser film and the calibration plate; If not, return to the step of placing the laser film on the calibration plate until there are no bubbles or warping between the laser film and the calibration plate.

6. The galvanometer size accuracy calibration method according to claim 1, characterized in that: Before the step of controlling the additive manufacturing device to perform laser printing on the laser film by executing the galvanometer execution file, the method further includes the steps of: setting the number of matrix points and the matrix point interval in the X / Y direction in the galvanometer execution file, and generating a design test image according to the number of matrix points and the matrix point interval in the X / Y direction; The step of controlling the additive manufacturing device to perform laser printing on the laser film by executing the galvanometer execution file to obtain the printed test image is: controlling the additive manufacturing device to perform laser printing on the laser film according to the designed test image by executing the galvanometer execution file to obtain the printed test image.

7. The galvanometer size accuracy calibration method according to claim 1, characterized in that: Before the step of controlling the additive manufacturing device to perform laser printing on the laser film by executing the galvanometer execution file, the step further includes: Cleaning the galvanometer scanning area; Close the door of the working compartment.

8. The galvanometer size accuracy calibration method according to claim 1, characterized in that: The preset deviation value is 48 μm to 55 μm.

9. The galvanometer size accuracy calibration method according to claim 1, characterized in that: The CCD camera recognition platform also includes a cabinet and a cabinet door; the cabinet is a hollow structure with a door opening at one end; one end of the cabinet door is rotatably connected to the edge of the door opening to open or close the cabinet; and the frame is installed in the cabinet.

10. The galvanometer size accuracy calibration method according to claim 9, characterized in that: The top of the cabinet is provided with a hanging ring, and the bottom is provided with a foot pad.

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