Galvanometer dimensional accuracy calibration method

Abstract

This invention relates to a method for calibrating the dimensional accuracy of a galvanometer. The method utilizes additive manufacturing equipment for laser printing to obtain a printed test image; an automatic recognition model-controlled CCD camera identifies the coordinate values ​​of each point in the printed test image and obtains a coordinate data file; a galvanometer deviation value is obtained based on the coordinate data file and the galvanometer execution file; if the absolute value of the galvanometer deviation value is greater than a preset deviation value, the parameters in the galvanometer execution file are calibrated and modified according to the galvanometer deviation value, and the process returns to 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. Therefore, the entire process does not require large-format printing of patterns, nor does it require pattern cutting and splicing, which is beneficial to improving calibration accuracy. The CCD camera recognition platform is easy to disassemble and assemble, has a small size, and is convenient to carry and use during after-sales service.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to a method for calibrating the dimensional accuracy of a galvanometer. Background Technology

[0002] The laser galvanometer system is one of the most important components in selective laser melting (SLM) additive manufacturing technology for metals, and the accuracy of galvanometer movement directly determines the size of the printed parts. However, due to various factors such as equipment vibration, galvanometer aging, and changes in the working environment, the accuracy of the galvanometer can also be affected, leading to substandard dimensional accuracy of the printed parts. Therefore, precise galvanometer calibration is an essential step in the commissioning of SLM equipment.

[0003] The most common galvanometer calibration method at present is to scan a specific pattern on a specific medium and then use a measuring tool to detect the coordinate values ​​of the pattern. However, the existing galvanometer calibration methods still have the following technical problems: 1) Coordinate value detection is performed by scanning the pattern with a scanner, but the pattern printed by large-format equipment needs to be cut and spliced, which affects the accuracy of the detection; 2) Another method of coordinate value detection is to use a 2D measuring instrument or other instruments, but some instruments are too large and inconvenient to use when maintaining customer equipment. Summary of the Invention

[0004] Therefore, 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 includes the following steps:

[0006] A CCD camera recognition platform is provided and an automatic recognition model is established; the CCD camera recognition platform includes 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] The laser film is bonded to the laser galvanometer scanning area of ​​the additive manufacturing equipment;

[0008] By executing the galvanometer executable file, the laser galvanometer system in the additive manufacturing equipment is controlled to print a test image on the upper surface of the laser film.

[0009] The calibration plate and the laser film printed with the test image are mounted together on the calibration plate mounting platform;

[0010] The automatic recognition model is used to control the CCD camera to identify the coordinate values ​​of each point in the printed test image, so as to obtain a coordinate data file;

[0011] The galvanometer deviation value is calculated based on 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, the parameters in the galvanometer execution file are calibrated and modified 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 is less than or equal to the preset deviation value.

[0014] In one embodiment, prior to the step of mounting the calibration plate and the laser film printed with the printed test image together on the calibration plate mounting platform, the step further includes:

[0015] The positions and orientations 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 adjusting the position and orientation 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 perform calibration recognition on the calibration plate, and calculating the recognition error value of the CCD camera based on the recognition 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 a calibration plate with a laser film attached to it in the laser galvanometer scanning area of ​​the additive manufacturing equipment includes:

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

[0020] Adjust 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;

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

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

[0023] In one embodiment, after the step of attaching the laser film to a predetermined position on the surface of the calibration plate, the step further includes:

[0024] Determine whether there are air 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 embodiment, before the step of controlling the additive manufacturing equipment to perform laser printing on the laser film by executing the galvanometer execution file, the method further includes the step 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 based on the number of matrix points and the matrix point interval in the X / Y direction;

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

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

[0029] Clean the scanning area of ​​the galvanometer;

[0030] Close the hatch to the working compartment.

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

[0032] In one embodiment, the CCD camera recognition platform further 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; the frame is installed inside the cabinet.

[0033] In one embodiment, the cabinet has a hanging ring at the top and foot pads at the bottom.

[0034] The above-mentioned galvanometer dimensional accuracy calibration method first uses additive manufacturing equipment to perform laser printing on the laser film in the laser galvanometer scanning area to obtain a printed test image; then, an automatic recognition model controls a CCD camera to identify the coordinate values ​​of each point in the printed test image and generate coordinate data files in sequence; next, the coordinate data files 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 indicates 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. Then, the step of attaching the laser film to the laser galvanometer scanning area of ​​the additive manufacturing equipment and all subsequent steps are executed again until the absolute value of the galvanometer deviation value is less than the preset deviation value, thus completing the galvanometer dimensional accuracy calibration work.

[0035] In the above-mentioned galvanometer size accuracy calibration method, there is no need to print large-format patterns, and correspondingly, there is no need to cut and splice the patterns. This is conducive to improving calibration accuracy. Moreover, the CCD camera recognition platform is easy to disassemble and assemble, and its small size makes it convenient to carry and use during after-sales service. Therefore, the use of the above-mentioned galvanometer size accuracy calibration method improves the calibration accuracy and the convenience of calibration operation. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a flowchart illustrating the galvanometer size accuracy calibration method in a preferred embodiment of the present invention.

[0038] Figure 2 for Figure 1 A schematic diagram of the CCD camera recognition platform used in the galvanometer size accuracy calibration method shown in the figure, taken from one viewpoint.

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

[0040] Figure 4 for Figure 1 The flowchart of steps S40-1 to S40-3, which are added before step 40 in the galvanometer size accuracy calibration method shown.

[0041] Figure 5 for Figure 1A flowchart illustrating step S50 in the galvanometer size accuracy calibration method shown.

[0042] Figure 6 for Figure 1 A flowchart illustrating step S20 in the galvanometer size accuracy calibration method shown.

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

[0044] Labeling Explanation: 100, CCD camera recognition platform; 110, rack; 120, calibration plate mounting platform; 130, movable camera mounting platform; 140, CCD camera; 150, cabinet; 160, cabinet door; 170, hanging ring; 180, foot pad. Detailed Implementation

[0045] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

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

[0048] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

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

[0050] Please also refer to Figure 2 and Figure 3 Step S10: Provide a CCD camera recognition platform 100 and establish 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 adjust the lateral position of the CCD camera 140.

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

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

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

[0055] Specifically, the laser galvanometer system in the additive manufacturing equipment is controlled by the galvanometer execution file to print calibration patterns on laser film according to preset instructions, thereby obtaining printed test images.

[0056] In step S40, the calibration plate and the laser film with the printed test image are mounted together on the calibration plate mounting platform 120. That is, the calibration plate with the laser film attached is mounted on the calibration plate mounting platform 120, and the laser film has the printed test image printed on it.

[0057] Step S50: The CCD camera 140 is controlled by an automatic recognition model to identify the coordinate values ​​of each point in the printed test image in order to obtain a coordinate data file.

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

[0059] Step S70: If the absolute value of the galvanometer deviation is greater than the preset deviation value, the parameters in the galvanometer execution file are calibrated and modified according to the galvanometer deviation value. If the absolute value of the galvanometer deviation is greater than the preset deviation value, the galvanometer accuracy of the laser galvanometer system in the additive manufacturing equipment in the manual cannot meet the product printing requirements.

[0060] Step S80: 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 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~55μm.

[0062] By executing steps S10 to S80, the galvanometer accuracy of the laser galvanometer system in the additive manufacturing equipment can be calibrated. Step S10 obtains the assembled CCD camera recognition platform 100 and an automatic recognition model for controlling the CCD camera 140 to automatically recognize the coordinate values ​​of each point in the image. Steps S20 and S30 utilize the existing galvanometer execution file of the additive manufacturing equipment to control the laser galvanometer system to perform laser printing on laser film, obtaining a printed test image. Steps S40 and S50 utilize the automatic recognition model established in step S10 to control the CCD camera 140 to automatically recognize the coordinate values ​​of each point in the printed test image, generating a coordinate data file according to the recognition order. Step S60 compares and calculates the coordinate data file with the galvanometer execution file from step S30 to obtain the galvanometer deviation value. If, after executing step S70, the absolute value of the galvanometer deviation is greater than the preset deviation value, it indicates 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. Then, by executing step S80, the process returns to re-execute steps S20 to S70. In step S30, the calibrated and modified galvanometer execution file is used until the absolute value of the galvanometer deviation is less than or equal to the preset deviation value. This completes the calibration of the entire galvanometer accuracy.

[0063] It should be noted that in step S80, steps S20 to S70 are 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 large-format patterns, and correspondingly, there is no need to cut and splice the patterns. The entire accuracy calibration process is a complete printed test image, which is conducive to improving the calibration accuracy. Moreover, the CCD camera recognition platform 100 is easy to disassemble and assemble, and its small size makes it convenient to carry and use during after-sales service. Therefore, the use of the above-mentioned galvanometer size accuracy calibration method improves the calibration accuracy and the convenience of calibration operation of galvanometer calibration.

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

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

[0067] Thus, before performing step S40, the calibration plate mounting platform 120 and the movable camera mounting platform 130 are adjusted to be parallel and aligned to improve the recognition accuracy when performing 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 refer to Figure 4 Furthermore, in some embodiments, after the step of adjusting the position and orientation 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: Establish the calibration model.

[0070] Step S40-2: Install the calibration board on the calibration board mounting platform 120.

[0071] Step S40-3: Use the calibration model to control the CCD camera 140 to perform calibration and recognition on the calibration board, and calculate the recognition error value of the CCD camera 140 based on the recognition result.

[0072] Please also refer to Figure 5 Step S50 includes steps S51 and S52.

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

[0074] Step S52: Calculate the coordinate data file based on 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. The recognition data file obtained in step S51 is a data file containing the coordinate values ​​of each point in the printed test image, which is directly recognized and acquired by the CCD camera 140. By executing step S51, the recognition error value is used to perform interpolation calculation on the recognition data file to obtain a more accurate coordinate data file, thereby eliminating the recognition error of the CCD camera recognition platform 100 and further improving the calibration accuracy of the galvanometer calibration.

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

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

[0078] Step S22: Adjust 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: Adjust the position of the calibration plate downwards to match the thickness of the laser film. That is, adjust the position of the calibration plate downwards to match the thickness of the laser film.

[0080] Step S24: Place the laser film at a preset position on the surface of the calibration plate.

[0081] The preset position in step S24 above refers to the actual sintering surface position of the additive manufacturing equipment, 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 subsequent galvanometer calibration, thereby making the calibration accuracy of the galvanometer calibration higher.

[0082] Furthermore, in some embodiments, step S24 is followed by steps S25 and S26.

[0083] Step S25: Determine whether there are air bubbles or warping between the laser film and the calibration plate.

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

[0085] Thus, by performing steps S25 and S26, it is ensured that the laser film can be completely adhered to the calibration plate without any incomplete adhesion such as bubbles or warping, so as to obtain a printed test image with higher printing accuracy, which will facilitate further improvement of the accuracy of subsequent galvanometer calibration.

[0086] In some embodiments, before step S30, the method further includes the step 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 based on the number of matrix points and the matrix point interval in the X / Y direction.

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

[0088] In this way, staff can design different test images according to actual conditions and needs, thereby obtaining different printed test images. For example, staff can obtain test images based on the available conditions, thus providing different printed test images for subsequent galvanometer accuracy calibration, to adapt to galvanometer accuracy calibration work under different environments and conditions.

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

[0090] Step S30-1: Clean the galvanometer scanning area.

[0091] Step S30-2: Close the hatch of the working compartment.

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

[0093] Please refer to it 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 frame 110 is installed inside the cabinet 150.

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

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

[0096] When it is necessary to assemble and disassemble the CCD camera recognition platform 100, the staff can use the lifting equipment to hook the lifting ring 170 to transfer or transport the CCD camera recognition platform 100, so as to further improve the convenience of carrying and using the CCD camera recognition platform 100 after its sale.

[0097] The foot pads 180 prevent the cabinet 150 from directly contacting the ground or other surfaces, thereby reducing the probability of wear and tear on the cabinet 150 and extending the service life of the CCD camera recognition platform 100.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for calibrating the dimensional accuracy of a galvanometer, characterized in that, Including the following steps: A CCD camera recognition platform is provided and an automatic recognition model is established; the CCD camera recognition platform includes 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; The laser film is bonded to the laser galvanometer scanning area of ​​the additive manufacturing equipment; specifically, the steps include: placing a 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 equipment; Adjust the position of the calibration plate downwards to a height consistent with the thickness of the laser film; The laser film is attached and placed at a predetermined position on the upper surface of the calibration plate; By executing the galvanometer executable file, the laser galvanometer system in the additive manufacturing equipment is controlled to print a test image on the upper surface of the laser film. The calibration plate and the laser film printed with the test image are mounted together on the calibration plate mounting platform; The automatic recognition model is used to control the CCD camera to identify the coordinate values ​​of each point in the printed test image, so as to obtain a coordinate data file; The galvanometer deviation value is calculated based on 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, the parameters in the galvanometer execution file are calibrated and modified 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 is less than or equal to the preset deviation value.

2. The galvanometer dimensional accuracy calibration method according to claim 1, characterized in that, Before the step of mounting the calibration plate and the laser film printed with the test image onto the calibration plate mounting platform, the method further includes the following step: The positions and orientations 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 adjusting the position and orientation 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 perform calibration recognition on the calibration plate, and calculating the recognition error value of the CCD camera based on the recognition 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, After the step of attaching the laser film to a predetermined position on the surface of the calibration plate, the method further includes the following step: Determine whether there are air 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.

5. The galvanometer dimensional accuracy calibration method according to claim 1, characterized in that, Before the step of controlling the additive manufacturing equipment to perform laser printing on the laser film by executing the galvanometer execution file, the method further includes the step 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 based on the number of matrix points and the matrix point interval in the X / Y direction; The step of controlling the additive manufacturing equipment to perform laser printing on the laser film by executing the galvanometer execution file to obtain a printed test image is as follows: by executing the galvanometer execution file, the additive manufacturing equipment is controlled to perform laser printing on the laser film according to the designed test image to obtain the printed test image.

6. The galvanometer dimensional accuracy calibration method according to claim 1, characterized in that, Prior to the step of controlling the additive manufacturing equipment to perform laser printing on the laser film by executing the galvanometer execution file, the method further includes the following step: Clean the scanning area of ​​the galvanometer; Close the hatch to the working compartment.

7. The galvanometer dimensional accuracy calibration method according to claim 1, characterized in that, The preset deviation value is 48μm~55μm.

8. The galvanometer dimensional 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; the frame is installed inside the cabinet.

9. The galvanometer dimensional accuracy calibration method according to claim 8, characterized in that, The cabinet is equipped with a hanging ring at the top and foot pads at the bottom.

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