Additive manufacturing equipment and its calibration method

Abstract

This application relates to an additive manufacturing apparatus and its calibration method. Among them, the additive manufacturing apparatus includes an energy source for emitting laser light. A galvanometer system for receiving and enabling the laser to scan within a certain range. A forming system including a base and a forming platform, the forming platform is mounted on the base and is used to receive the forming material and the laser light after the action of the galvanometer system. A calibration system including a calibration ruler and a printing surface imaging device, the calibration ruler is mounted on the base and has a fixed relative position with the printing surface imaging device, and is used for geometric calibration of the printing surface imaging device, and the printing surface imaging device is used to calibrate the galvanometer system. This application can enable the galvanometer system to obtain more accurate calibration results.

Description

Technical Field

[0001] This application relates to the technical field of radar testing, and particularly to an additive manufacturing equipment and its calibration method. Background Art

[0002] Additive manufacturing technology is a research hotspot in the current industrial and academic fields. In particular, industrial giants such as GE and Siemens have also realized the installation and trial use of multiple additive manufacturing parts. Although additive manufacturing technology has achieved good development, its process is difficult to standardize, and the quality consistency of parts is difficult to guarantee. For example, for the same part processed by the same equipment, there will be large deviations in the final mechanical properties and geometric accuracy. To solve this problem, a large number of devices with process monitoring have emerged.

[0003] Since each solidification point in the additive manufacturing process is related to the final forming quality, it is also necessary to ensure that the monitoring equipment and the printing equipment itself have a considerable degree of accuracy. Therefore, how to accurately calibrate these devices has become an urgent problem to be solved. Summary of the Invention

[0004] Based on this, it is necessary to provide an additive manufacturing equipment and its calibration method for the above technical problems.

[0005] An additive manufacturing equipment includes:

[0006] An energy source for emitting laser;

[0007] A galvanometer system for receiving and enabling the laser to scan within a certain range;

[0008] A forming system including a base and a forming table, the forming table is installed on the base and is used for receiving forming materials and the laser after the action of the galvanometer system;

[0009] A calibration system including a calibration ruler and a printing surface imaging device, the calibration ruler is installed on the base and has a fixed relative position with the printing surface imaging device, and is used for geometric calibration of the printing surface imaging device, and the printing surface imaging device is used for calibrating the galvanometer system.

[0010] In one embodiment,

[0011] The additive manufacturing equipment further includes a focusing system, and the focusing system is used for focusing the laser emitted by the energy source and emitting it to the galvanometer system;

[0012] The printing surface imaging device is also used for calibrating the focusing system.

[0013] In one embodiment,

[0014] The additive manufacturing equipment further includes a focusing system, which is used to focus the laser emitted by the energy source and emit it to the galvanometer system;

[0015] The calibration system further includes a molten pool imaging device, and the relative position of the molten pool imaging device and the printing surface imaging device is fixed.

[0016] In one embodiment, the additive manufacturing equipment further includes an image storage module, which is used to store a galvanometer reference image and a focusing reference image. The galvanometer reference image is used for the calibration of the galvanometer system, and the focusing reference image is used for the calibration of the focusing system.

[0017] In one embodiment, the calibration system further includes a standard heat source, which is installed on the base and used for temperature calibration of the molten pool imaging device.

[0018] In one embodiment, the relative position of the standard heat source and the molten pool imaging device is fixed.

[0019] In one embodiment, the standard heat source includes multiple heat sources.

[0020] In one embodiment, the temperature of the standard heat source is controllable.

[0021] In one embodiment, the calibration ruler includes a first ruler and a second ruler, and the first ruler and the second ruler are perpendicular to each other.

[0022] In one embodiment, the pattern on the first ruler and / or the second ruler is a checkerboard or periodic dots.

[0023] The calibration method of the additive manufacturing equipment according to any one of the above includes:

[0024] The printing surface imaging device acquires an image of the calibration ruler;

[0025] Geometric calibration of the printing surface imaging device is performed according to the image of the calibration ruler;

[0026] Control the galvanometer system to form a light spot according to a first predetermined position group;

[0027] The printing surface imaging device collects the light spot images at the first predetermined position group;

[0028] Calculate the centers of the light spots at different predetermined positions according to the shapes of the light spots at different predetermined positions;

[0029] Calculate the relationship between the centers of the light spots at different predetermined positions and the control amount for the galvanometer system, and calibrate the galvanometer system.

[0030] In one embodiment, after calculating the relationship between the centers of the light spots at different predetermined positions and the control amounts for the galvanometer system and calibrating the galvanometer system, the method further includes:

[0031] Controlling the calibrated galvanometer system to form a light spot according to a second set of predetermined positions;

[0032] The printing surface imaging device acquires light spot images at the second set of predetermined positions;

[0033] Storing the light spot images acquired by the printing surface imaging device as galvanometer reference images.

[0034] In one embodiment, after storing the light spot images acquired by the printing surface imaging device as galvanometer reference images, it includes:

[0035] Controlling the galvanometer system to form a light spot according to a second set of predetermined positions;

[0036] The printing surface imaging device acquires light spot images at the second set of predetermined positions;

[0037] Calculating the centers of the light spots at different predetermined positions according to the shapes of the light spots at different predetermined positions;

[0038] Calculating the relationship between the centers of the light spots at different predetermined positions and the galvanometer reference images, and calibrating the galvanometer system.

[0039] In one embodiment, the additive manufacturing equipment further includes a focusing system. After calculating the relationship between the centers of the light spots at different predetermined positions and the control amounts for the galvanometer system and calibrating the galvanometer system, the method further includes:

[0040] Controlling the calibrated galvanometer system to form a light spot at a third set of predetermined positions;

[0041] The printing surface imaging device acquires light spot images at the third set of predetermined positions;

[0042] Calculating the foci of the light spots at different predetermined positions according to the shapes of the light spots at different predetermined positions;

[0043] Calculating the relationship between the foci of the light spots at different predetermined positions and the control amounts for the focusing system, and calibrating the focusing system.

[0044] In one embodiment, after calculating the relationship between the foci of the light spots at different predetermined positions and the control amounts for the focusing system and calibrating the focusing system, the method further includes:

[0045] Controlling the calibrated galvanometer system to form a light spot according to a fourth set of predetermined positions;

[0046] The printing surface imaging device acquires the spot images at the fourth predetermined position group;

[0047] Store the spot images acquired by the printing surface imaging device as the focusing reference images.

[0048] In one embodiment, after storing the spot images acquired by the printing surface imaging device as the focusing reference images, it further includes:

[0049] Calibrate the galvanometer system;

[0050] Control the calibrated galvanometer system to form spots according to the fourth predetermined position group;

[0051] The printing surface imaging device acquires the spot images at the fourth predetermined position group;

[0052] Calculate the foci of the spots at different predetermined positions according to the shapes of the spots at different predetermined positions;

[0053] Calculate the relationship between the centers of the spots at different predetermined positions and the focusing reference images, and calibrate the focusing system.

[0054] In one embodiment, the calibration system further includes a molten pool imaging device. After calculating the relationship between the centers of the spots at different predetermined positions and the control amounts for the galvanometer system and calibrating the galvanometer system, it further includes:

[0055] Control the calibrated galvanometer system to form spots at the fifth predetermined position group;

[0056] The printing surface imaging device and the molten pool imaging device simultaneously acquire the spot images at the fifth predetermined position group;

[0057] Compare the images of the printing surface imaging device and the images of the molten pool imaging device, and perform geometric calibration on the molten pool imaging device.

[0058] In the above additive manufacturing equipment and its calibration method, the calibration system includes a calibration ruler and a printing surface imaging device. The calibration ruler is installed on the base of the forming system and has a fixed relative position with the printing surface imaging device. The calibration ruler is used to perform geometric calibration on the printing surface imaging device, and the printing surface imaging device is used to calibrate the galvanometer system. Since the printing surface imaging device is calibrated using a calibration ruler with a fixed relative position to it, the traceability of the imaging system can be ensured, and thus the calibration of the printing surface imaging device is more accurate. Therefore, the galvanometer system calibrated by the printing surface imaging device can obtain a more accurate calibration result. Description of the Drawings

[0059] Figure 1Schematic diagram of an additive manufacturing apparatus in an embodiment;

[0060] Figure 2 Partial schematic diagram of another angle of the additive manufacturing apparatus in an embodiment;

[0061] Figure 3 Schematic diagram of a calibration method for an additive manufacturing apparatus in an embodiment. Detailed implementation manners

[0062] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] Additive manufacturing technology is a research hotspot in the current industrial and academic circles. In particular, industrial giants such as GE and Siemens have already carried out installation trials of multiple additive manufacturing parts. Although additive manufacturing technology has achieved good development, its process is difficult to standardize, and the quality consistency of the manufactured parts is difficult to guarantee. For example, for the same part processed by the same apparatus, there will be large deviations in the final mechanical properties and geometric accuracy. To solve this problem, a large number of devices with process monitoring have emerged.

[0064] Since each solidification point in the additive manufacturing process is related to the final forming quality, it is also necessary to ensure that the monitoring device and the printing device itself have a considerable degree of accuracy. Therefore, how to accurately calibrate these devices has become an urgent problem to be solved.

[0065] Based on this, the present application proposes an additive manufacturing apparatus and its calibration method.

[0066] In one embodiment, referring to Figure 1 and Figure 2 , an additive manufacturing apparatus is provided, including an energy source 100, a galvanometer system 600, a forming system, and a calibration system.

[0067] The energy source 100 is used to emit high-energy laser beams, thereby providing energy for the manufacturing process of the additive manufacturing apparatus. The galvanometer system 600 receives the laser from the energy source 100. Specifically, a focusing system and a reflection system 500 may also be provided between the galvanometer system 600 and the energy source. The high-energy laser beam emitted by the energy source 100 can first be focused by the focusing system, and then the focused light beam is emitted to the reflection system 500. After that, the reflection system 500 reflects the received laser beam to the galvanometer system 600, so that the galvanometer system receives the laser from the energy source 100.

[0068] Of course, in other embodiments, the specific structure between the energy source 100 and the galvanometer system 600 of the additive manufacturing equipment can also be adjusted according to the actual situation, and the present application does not limit this.

[0069] The galvanometer system 600 receives the laser and acts it on the forming system. The forming system includes a base 730 and a forming platform 200. The base 730 is an installation base. The forming platform 200 is installed on the base 730 and then receives the laser that has been acted on by the galvanometer system 600. At the same time, the forming platform 200 also receives a forming material (such as a powder material) and then performs additive manufacturing. The forming system may further include a first lifting platform 320 for realizing the lifting of the forming platform 200.

[0070] The calibration system includes a calibration ruler 410 and a printing surface imaging device 420. The calibration ruler 410 is used to calibrate the printing surface imaging device 420, and its relative position with the printing surface imaging device 420 is fixed. At the same time, the calibration ruler 410 is installed on the base 730 in the same way as the forming platform 200. Therefore, the printing surface imaging device 420 calibrated by the calibration ruler 410 can accurately determine the shape and size of the product formed on the forming platform 200. The printing surface imaging device 420 is used to calibrate the galvanometer system 600.

[0071] The specific calibration process of the galvanometer system 600 can be as follows: The printing surface imaging device 420 acquires an image of the calibration ruler 410. According to the image of the calibration ruler 410, geometric calibration is performed on the printing surface imaging device 420. Control the galvanometer system 600 to form light spots according to a first set of predetermined positions. The printing surface imaging device 420 collects images of the light spots. Calculate the centers of the light spots at different predetermined positions according to the shapes of the light spots at different predetermined positions. Calculate the relationship between the centers of the light spots at different predetermined positions and the control amount for the galvanometer system 600 to calibrate the galvanometer system 600.

[0072] In this embodiment, the printing surface imaging device 420 is calibrated using the calibration ruler 410 with a fixed relative position thereto, which can ensure the traceability of the imaging system, and thus make the calibration of the printing surface imaging device 420 more accurate. Therefore, the galvanometer system 600 calibrated by the printing surface imaging device 420 can obtain a more accurate calibration result.

[0073] Furthermore, when the additive manufacturing equipment includes a focusing system, the printing surface imaging device 420 can also be used to calibrate the focusing system. At this time, similarly, since the printing surface imaging device 420 is calibrated using the calibration ruler 410 with a fixed relative position thereto, it can ensure the traceability of the imaging system, and thus make the calibration of the focusing system more accurate.

[0074] The calibration process of the focusing system can be as follows: control the calibrated galvanometer system 600 to form a light spot at the third predetermined position group. The printing surface imaging device 420 acquires an image of the light spot. Calculate the focal points of the light spot at different predetermined positions according to the shape of the light spot at different predetermined positions. Then, calculate the relationship between the focal points of the light spot at different predetermined positions and the control amount of the focusing system to calibrate the focusing system.

[0075] In one embodiment, the calibration system further includes a molten pool imaging device 430. The relative position of the molten pool imaging device 430 and the printing surface imaging device 420 is fixed. Therefore, the geometric calibration of the molten pool imaging device 430 can be performed by the printing surface imaging device 420.

[0076] Specifically, the printing surface imaging device 420 and the molten pool imaging device 430 can be made to simultaneously acquire images of the light spot formed by the high-energy beam laser on the forming table 200. Then, compare the two to simply and accurately complete the geometric calibration of the molten pool imaging device 430.

[0077] In the additive manufacturing equipment of this embodiment, while calibrating the focusing system through the printing surface imaging device 420, the focusing system can also be calibrated through the molten pool imaging device 430. The calibration results of the two can be mutually verified, thereby improving the calibration accuracy of the focusing system.

[0078] At the same time, in this embodiment, the calibration system can further include a standard heat source 440. The standard heat source 440 is installed on the base 730 and is used for temperature calibration of the molten pool imaging device 430.

[0079] Furthermore, the position of the standard heat source 440 and the molten pool imaging device 430 can be set to be relatively fixed, so as to facilitate the molten pool imaging device 430 to acquire an image of it, and further facilitate the temperature calibration of the molten pool imaging device 430.

[0080] The standard heat source 440 here can include multiple heat sources. For example, it can include three heat sources: a low-temperature heat source, a medium-temperature heat source, and a high-temperature heat source. Of course, the standard heat source 440 can also be a temperature-controllable standard heat source, and the temperature value of the standard heat source can be adjusted according to the temperature points to be calibrated. The specific form of the standard heat source 440 in this application is not limited.

[0081] In one embodiment, the additive manufacturing equipment includes an image storage module. The image storage module is used to store the galvanometer reference image and the focusing reference image. The galvanometer reference image is used for the calibration of the galvanometer system 600. The focusing reference image is used for the calibration of the focusing system.

[0082] At this time, during the calibration process of the galvanometer system 600, the laser image on the forming table 200 collected by the printing surface imaging device 420 can be compared with the galvanometer reference image stored in the image storage module, so as to simply complete the calibration of the galvanometer system 600.

[0083] Similarly, during the calibration process of the focusing system, the laser image on the forming table 200 collected by the molten pool imaging device 430 can be compared with the focusing reference image stored in the image storage module, so as to simply complete the calibration of the focusing system.

[0084] In one embodiment, in order to make the calibration of the calibration ruler 410 for the printing surface imaging device 420 more comprehensive and accurate, the calibration ruler 410 is provided to include a first ruler and a second ruler. The first ruler and the second ruler are perpendicular to each other. Furthermore, the printing surface imaging device 420 can obtain accurate calibration in two mutually perpendicular directions (such as the horizontal direction and the vertical direction). Specifically, the pattern on the first ruler and / or the second ruler can be a checkerboard or periodic dots, etc.

[0085] In addition, in the embodiment of the present application, the additive manufacturing equipment may further include a powder spreading system. The powder spreading system includes a powder spreading device 720, a second lifting table 330, and a powder collecting container 710.

[0086] After the additive manufacturing equipment is started, the focusing system and the galvanometer system 600 are first calibrated. Then, a high-energy beam laser is emitted by the energy source 100. After passing through the focusing system, the laser enters the galvanometer system 600 through the reflection system 500. The galvanometer system 600 enables the laser to scan within a certain range through the action of the galvanometer and acts on the forming table 200 of the forming system.

[0087] After each layer is printed, the first lifting table 320 of the forming system descends a certain height, and the second lifting table 330 of the powder spreading system ascends a certain height. Then, the scraper of the powder spreading device 720 is driven to evenly spread the powder onto the forming table 200, and the excess powder will directly enter the powder collecting container 710.

[0088] During the printing process, the printing surface imaging device 420 can be used to obtain the image of each layer during or after the printing process for subsequent analysis. At the same time, the molten pool imaging device 430 is used to obtain the implementation information of the molten pool, which can be used for feedback control, etc.

[0089] In one embodiment, referring to Figure 3 , a calibration method for additive manufacturing equipment is provided. The additive manufacturing equipment can be any one of the additive manufacturing equipment in the above embodiments and the variant embodiments derived from the above embodiments. The calibration method of the additive manufacturing equipment includes the following steps:

[0090] Step S1, the printing surface imaging device 420 acquires an image of the calibration ruler 410.

[0091] Step S2, geometric calibration of the printing surface imaging device 420 is performed according to the image of the calibration ruler 410.

[0092] Specifically, the additive manufacturing equipment is provided with a control module for implementation processing and control. The control module can be a separate control module, or can be all or part of it located in a certain system of the additive manufacturing equipment (for example, in the printing surface imaging device 420 and / or the molten pool imaging device 430 in the calibration system). There is no limitation in this application comparison.

[0093] The control module can receive the image of the calibration ruler 410 acquired by the printing surface imaging device 420, and then calculate the distortion coefficient of the printing surface imaging device 420. A mature calculation method can be used here to obtain this coefficient, and the calculation result is used as the calibration data of the printing surface imaging device 420 to complete the geometric calibration.

[0094] Step S3, control the galvanometer system 600 to form a light spot according to the first predetermined position group.

[0095] At this time, the high-energy beam energy of the energy source 100 can be first adjusted to the lowest, and then the laser is emitted. After the galvanometer system 600 receives the laser emitted by the energy source 100, the laser can be scanned within a certain range. The control module applies a control amount to the galvanometer system 600, so that the galvanometer system 600 forms the laser light spot emitted by the energy source 100 on the forming table 200 of the forming system according to the first predetermined position group.

[0096] The first predetermined position group includes a plurality of different predetermined positions, which can be a dot matrix position group formed by the discontinuous action of the light spot, or a scanning line position group formed by the continuous action of the light spot, etc. There is no limitation on its specific form in this application.

[0097] Step S4, the printing surface imaging device 420 collects the light spot images at the first predetermined position group.

[0098] At this time, the printing surface imaging device 420 has completed geometric calibration in step S2.

[0099] Step S5, calculate the centers of the light spots at different predetermined positions according to the shapes of the light spots at different predetermined positions.

[0100] Step S6, calculate the relationship between the centers of the light spots at different predetermined positions and the control amount of the galvanometer system 600, and calibrate the galvanometer system 600.

[0101] The center of the light spot at different predetermined positions is the actual light spot center of different predetermined positions. By comparing and calculating the relationship between it and the control amount of the galvanometer system 600 by the control module, the galvanometer system 600 can be calibrated.

[0102] Further, after step S6 (calculating the relationship between the center of the light spot at different predetermined positions and the control amount of the galvanometer system 600, and calibrating the galvanometer system 600) of the method of this embodiment, it may further include:

[0103] Step S01, controlling the calibrated galvanometer system 600 to form a light spot according to the second predetermined position group.

[0104] The second predetermined position group also includes a plurality of different predetermined positions. It may be the same as or different from the first predetermined position group, and the present application has no limitation on this.

[0105] Step S02, the printing surface imaging device 420 collects the light spot images at the second predetermined position group.

[0106] Step S03, storing the light spot images collected by the printing surface imaging device as galvanometer reference images.

[0107] The above steps S1 to step S03 may be the first or the previous calibration. When the additive manufacturing equipment completes the first or the previous calibration and is used again, the calibration method of the additive manufacturing equipment may include, after step S03:

[0108] Step S001, controlling the galvanometer system 600 to form a light spot according to the second predetermined position group.

[0109] Step S002, the printing surface imaging device 420 collects the light spot images at the second predetermined position group.

[0110] Step S003, calculating the center of the light spot at different predetermined positions according to the shape of the light spot at different predetermined positions.

[0111] Step S004, calculating the relationship between the center of the light spot at different predetermined positions and the galvanometer reference image, and calibrating the galvanometer system.

[0112] In one embodiment, the additive manufacturing equipment further includes a focusing system. After step S6 (calculating the relationship between the center of the light spot at different predetermined positions and the control amount of the galvanometer system 600, and calibrating the galvanometer system 600), it further includes:

[0113] Step S11, controlling the calibrated galvanometer system 600 to form a light spot at the third predetermined position group.

[0114] The third predetermined position group also includes a plurality of different predetermined positions. It may be the same as or different from the first predetermined position group, and the present application has no limitation on this.

[0115] Step S12, the printing surface imaging device 420 collects the spot images at the third predetermined position group.

[0116] Step S13, calculate the foci of the spots at different predetermined positions according to the shapes of the spots at different predetermined positions.

[0117] Since the included angles of the spots at different positions are different in the printing surface imaging device 420, their imaging shapes in the printing surface imaging device 420 are also different. At this time, the foci of the spots at different predetermined positions can be calculated according to the shapes of the spots at different predetermined positions and the laser focal length, etc.

[0118] Step S14, calculate the relationship between the foci of the spots at different predetermined positions and the control amount for the focusing system, and calibrate the focusing system.

[0119] Further, after step S14 (calculate the relationship between the foci of the spots at different predetermined positions and the control amount for the focusing system, and calibrate the focusing system), it further includes:

[0120] Step S15, control the calibrated galvanometer system 600 to form spots according to the fourth predetermined position group.

[0121] The fourth predetermined position group also includes a plurality of different predetermined positions. It can be the same as or different from the third predetermined position group, and the present application has no limitation on this.

[0122] Step S16, the printing surface imaging device collects the spot images at the fourth predetermined position group.

[0123] Step S17, store the spot images collected by the printing surface imaging device as focusing reference images.

[0124] The above steps S1 to S17 can be the first or the previous calibration. When the additive manufacturing equipment completes the first or the previous calibration and is used again, the calibration method of the additive manufacturing equipment can include, after step S17:

[0125] Step S101, calibrate the galvanometer system 600.

[0126] The calibration method of the galvanometer system 600 can refer to steps S04 to S07 of the foregoing embodiment.

[0127] Step S102, control the calibrated galvanometer system 600 to form spots according to the fourth predetermined position group.

[0128] Step S103, the printing surface imaging device 420 collects the spot images at the fourth predetermined position group.

[0129] Step S104: Calculate the focal points of the light spot at different predetermined positions according to the shape of the light spot at different predetermined positions.

[0130] Step S105: Calculate the relationship between the centers of the light spot at different predetermined positions and the focusing reference image, and calibrate the focusing system.

[0131] In one embodiment, the calibration system further includes a molten pool imaging device 430. After step S6 (calculate the relationship between the centers of the light spot at different predetermined positions and the control amount for the galvanometer system 600, and calibrate the galvanometer system 600), it further includes:

[0132] Step S21: Control the calibrated galvanometer system to form a light spot at a fifth predetermined position group.

[0133] The fifth predetermined position group also includes a plurality of different predetermined positions. It can be the same as or different from the first predetermined position group, and the present application has no limitation on this.

[0134] Step S22: The printing surface imaging device 420 and the molten pool imaging device 430 simultaneously collect the light spot images at the fifth predetermined position group.

[0135] Step S23: Compare the images of the printing surface imaging device and the images of the molten pool imaging device, and perform geometric calibration on the molten pool imaging device.

[0136] Further, after step S23, it further includes:

[0137] Step S24: Control the calibrated galvanometer system 600 so that the molten pool imaging device 430 can observe the standard heat source 440.

[0138] The image of the standard heat source reaches the molten pool imaging device 430 after being fed back by the galvanometer system 600. Therefore, by controlling the galvanometer system 600, the molten pool imaging device 430 can observe the standard heat source 440.

[0139] Step S25: After the standard heat source 440 is stable, the molten pool imaging device 430 collects the temperature value of the standard heat source.

[0140] Step S26: Taking the standard heat source 440 as a reference, calculate the temperature conversion coefficient in the molten pool imaging device 430, and perform temperature calibration on the molten pool imaging device 430.

[0141] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope recorded in this specification.

[0142] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An additive manufacturing equipment, characterized in that, Comprising: An energy source for emitting a laser; A galvanometer system for receiving and enabling the laser to scan within a certain range; A forming system including a base and a forming table, the forming table being mounted on the base for receiving a forming material and the laser after the action of the galvanometer system; A calibration system including a calibration ruler and a printing surface imaging device, the calibration ruler being mounted on the base and having a fixed relative position with the printing surface imaging device for geometric calibration of the printing surface imaging device, and the printing surface imaging device being used for calibrating the galvanometer system; A focusing system for focusing the laser emitted by the energy source and emitting it to the galvanometer system; The calibration system further includes a molten pool imaging device, and the molten pool imaging device has a fixed relative position with the printing surface imaging device; The printing surface imaging device is further used for calibrating the focusing system and for geometric calibration of the molten pool imaging device; the molten pool imaging device is used for calibrating the focusing system.

2. The additive manufacturing equipment according to claim 1, characterized in that The additive manufacturing equipment further includes an image storage module for storing a galvanometer reference image and a focusing reference image, the galvanometer reference image being used for calibration of the galvanometer system, and the focusing reference image being used for calibration of the focusing system.

3. The additive manufacturing equipment according to claim 1, wherein, The calibration system further includes a standard heat source mounted on the base for temperature calibration of the molten pool imaging device.

4. The additive manufacturing equipment according to claim 3, characterized in that, The position of the standard heat source is relatively fixed with respect to the molten pool imaging device.

5. The additive manufacturing equipment according to claim 3, characterized in that The standard heat source includes a plurality of heat sources.

6. The additive manufacturing equipment according to claim 3, characterized in that, The temperature of the standard heat source is controllable.

7. The additive manufacturing equipment according to claim 1, characterized in that The calibration ruler includes a first ruler and a second ruler, and the first ruler and the second ruler are perpendicular to each other.

8. The additive manufacturing equipment according to claim 7, characterized in that, The pattern on the first ruler and / or the second ruler is a checkerboard or periodic dots.

9. The calibration method of the additive manufacturing equipment according to any one of claims 1-8, characterized in that Comprising: The printing surface imaging device acquires an image of the calibration ruler; Based on the image of the calibration ruler, geometric calibration of the printing surface imaging device is performed; The galvanometer system is controlled to form a light spot according to a first set of predetermined positions; The printing surface imaging device acquires an image of the light spot at the first set of predetermined positions; Based on the shape of the light spot at different predetermined positions, the center of the light spot at different predetermined positions is calculated; The relationship between the center of the light spot at different predetermined positions and the control amount for the galvanometer system is calculated to calibrate the galvanometer system.

10. The calibration method of the additive manufacturing equipment according to claim 9, wherein After calculating the relationship between the center of the light spot at different predetermined positions and the control amount for the galvanometer system and calibrating the galvanometer system, it further includes: The calibrated galvanometer system is controlled to form a light spot according to a second set of predetermined positions; The printing surface imaging device acquires an image of the light spot at the second set of predetermined positions; The image of the light spot acquired by the printing surface imaging device is stored as a galvanometer reference image.

11. The calibration method of the additive manufacturing equipment according to claim 10, characterized in that, After storing the image of the light spot acquired by the printing surface imaging device as a galvanometer reference image, it includes: The galvanometer system is controlled to form a light spot according to a second set of predetermined positions; The printing surface imaging device acquires an image of the light spot at the second set of predetermined positions; Based on the shape of the light spot at different predetermined positions, the center of the light spot at different predetermined positions is calculated; Calculate the relationship between the center of the light spot at different predetermined positions and the galvanometer reference image, and calibrate the galvanometer system.

12. The calibration method of the additive manufacturing equipment according to claim 9, wherein, The additive manufacturing equipment further includes a focusing system. Calculate the relationship between the center of the light spot at different predetermined positions and the control quantity of the galvanometer system. After calibrating the galvanometer system, it further includes: Control the calibrated galvanometer system to form a light spot at the third predetermined position group; The printing surface imaging device acquires the light spot images at the third predetermined position group; Calculate the focal points of the light spot at different predetermined positions according to the shape of the light spot at different predetermined positions; Calculate the relationship between the focal points of the light spot at different predetermined positions and the control quantity of the focusing system, and calibrate the focusing system.

13. The calibration method of the additive manufacturing equipment according to claim 12, characterized in that, Calculate the relationship between the focal points of the light spot at different predetermined positions and the control quantity of the focusing system. After calibrating the focusing system, it further includes: Control the calibrated galvanometer system to form a light spot according to the fourth predetermined position group; The printing surface imaging device acquires the light spot images at the fourth predetermined position group; Store the light spot images acquired by the printing surface imaging device as focusing reference images.

14. The calibration method of the additive manufacturing equipment according to claim 13, wherein After storing the light spot images acquired by the printing surface imaging device as focusing reference images, it further includes: Calibrate the galvanometer system; Control the calibrated galvanometer system to form a light spot according to the fourth predetermined position group; The printing surface imaging device acquires the light spot images at the fourth predetermined position group; Calculate the focal points of the light spot at different predetermined positions according to the shape of the light spot at different predetermined positions; Calculate the relationship between the center of the light spot at different predetermined positions and the focusing reference image, and calibrate the focusing system.

15. The calibration method of the additive manufacturing equipment according to claim 9, characterized in that, The calibration system further includes a molten pool imaging device. Calculate the relationship between the center of the light spot at different predetermined positions and the control quantity of the galvanometer system. After calibrating the galvanometer system, it further includes: Control the calibrated galvanometer system to form a light spot at the fifth predetermined position group; The printing surface imaging device and the molten pool imaging device simultaneously acquire the light spot images at the fifth predetermined position group; Compare the images of the printing surface imaging device and the images of the molten pool imaging device, and perform geometric calibration on the molten pool imaging device.

Images