Non-contact coordinate center calibration device and method for additive and subtractive composite manufacturing

Abstract

The invention discloses a non-contact coordinate center calibration device and method for additive and subtractive composite manufacturing. The method has the following beneficial effects that the high-precision laser displacement sensor and the flexible and adjustable support are matched with the rotatable index plate, so that the relative coordinates of the additive manufacturing center / subtractive manufacturing center relative to the center of the index plate can be obtained through calculation; in other words, the deviation among the additive manufacturing center, the subtractive manufacturing center and the index plate center is accurately measured and corrected in a non-contact mode so that the deviation can be fed back to the equipment control center, corresponding deviation correction is achieved, the machining accuracy is ensured, the precision and the yield of additive and subtractive composite manufacturing are effectively improved, and the production efficiency is improved. And the method has remarkable technical progress and practical value.

Description

Technical Field

[0001] The present invention relates to the technical field of additive and subtractive composite manufacturing with a working indexing plate, and in particular to a non-contact coordinate center calibration device and method for additive and subtractive composite manufacturing. Background Art

[0002] Additive and subtractive composite manufacturing technology is a new manufacturing technology that combines the high efficiency of additive manufacturing with the high precision advantages of subtractive manufacturing (such as milling and turning). It has been applied in aerospace, automobiles, molds, ships and other fields. Additive and subtractive composite manufacturing integrates additive manufacturing modules and subtractive manufacturing modules in the same equipment. The two processing and manufacturing processes of additive and subtractive work together at the same workstation to achieve the composite manufacturing of parts. The specific implementation method of additive and subtractive composite manufacturing is as follows: additive manufacturing of a specific height is performed according to the additive and subtractive manufacturing data package generated by the model, followed by subtractive processing of the surface, and then adding materials to the part after subtraction, and then subtracting materials again, and this cycle continues until the part is completed; at the same time, the workstation (i.e., the indexing plate) will rotate with the additive and subtractive processes according to the data package instructions to cooperate with the additive and subtractive processing.

[0003] Because the additive module, subtractive module, and indexing plate belong to different mechanical systems, it's almost impossible to empirically achieve complete alignment of their coordinate centers during manufacturing. This results in uneven cutting allowances in all directions, leading to part scrap. The center of the melt pool is considered the machining center of the additive manufacturing process. Factors such as the nozzle's geometric machining accuracy, the concentricity of the powder flow and laser beam, and the tilt of the deposition head can all contribute to variations in the melt pool center. Statistics show that the dimensional error of additively manufactured parts is approximately proportional to the part's design dimensions. The subtractive machining axis coincides with the spindle's rotational axis.

[0004] Based on the above considerations, the coordinate centers of the additive and subtractive processes are prone to deviations. In addition, during the additive and subtractive processes, the indexing plate will rotate with the process to cooperate with the additive and subtractive processing. Therefore, it is necessary to determine the degree of deviation between the indexing plate rotation center (i.e., the indexing plate center) and the additive processing center (i.e., the additive center or the additive manufacturing center) and the subtractive processing center (i.e., the subtractive center or the subtractive manufacturing center) to provide guidance for instruction correction. In summary, determining the dimensional error of the parts after additive manufacturing, the deviation between the additive manufacturing center / subtractive manufacturing center and the indexing plate rotation center is one of the key issues to ensure the accuracy, efficiency and yield of additive and subtractive manufacturing parts. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a non-contact coordinate center calibration device and method for additive and subtractive composite manufacturing. Through a laser displacement sensor, a bracket and a rotatable dividing plate, the relative coordinates of the additive manufacturing center / subtractive manufacturing center relative to the dividing plate center can be calculated and fed back to the equipment control center to achieve corresponding offset correction and ensure processing accuracy.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the present invention provides the following technical solution: a non-contact coordinate center calibration device for additive and subtractive composite manufacturing, comprising: a laser displacement sensor and a bracket, wherein the bracket includes a support rod and a mounting platform, the support rod is configured to be telescopically arranged up and down, the mounting platform is rotatably arranged on the support rod, the laser displacement sensor is mounted on the mounting platform, the laser displacement sensor is used to measure the distance between it and the surface of the measured part, and the measured part is placed on a rotatable dividing plate.

[0009] Preferably, the bracket further includes support legs, and the upper and lower ends of the support rod are respectively connected to the mounting platform and the support legs.

[0010] Preferably, the supporting legs are retractable.

[0011] Preferably, the laser displacement sensor is mounted on the mounting platform by a snap connection or a bolt fastening connection.

[0012] Preferably, a dial for determining the rotation angle of the mounting platform is provided on the mounting platform.

[0013] Preferably, the laser displacement sensor is provided with a display device for displaying the distance between the laser displacement sensor and the surface of the measured part.

[0014] In order to solve the above technical problems, the present invention provides another technical solution as follows: a non-contact coordinate center calibration method for additive and subtractive composite manufacturing, which uses any of the above-mentioned non-contact coordinate center calibration devices for additive and subtractive composite manufacturing to perform additive and subtractive coordinate center calibration.

[0015] Preferably, the non-contact coordinate center calibration method for additive and subtractive composite manufacturing specifically comprises the following steps:

[0016] S1. Place a part to be measured on a graduated plate. Specifically, the part to be measured is a standard block manufactured by an additive manufacturing process. The standard block includes a lower cuboid and an upper cuboid. The lower cuboid is placed on the graduated plate, and the upper cuboid is placed on the lower cuboid. The additive manufacturing process centers of the lower and upper cuboids are the same, and the sides are parallel to each other. The length of the lower cuboid is E, and the width is F. The length of the upper cuboid is G, and the width is H, where E>G and F>H.

[0017] S2. Direct the emitting end of the laser displacement sensor toward the first side surface of the lower rectangular parallelepiped. Emit a laser beam from the laser displacement sensor to measure the distance between the first side surface and the laser displacement sensor as A1. Further, rotate the mounting platform and the laser displacement sensor in a first direction by a first angle α1 and measure the distance between the laser displacement sensor and the first side surface as A2. Reset the mounting platform.

[0018] S3, rotating the mounting platform together with the laser displacement sensor in a second direction by a second angle α2 so that the laser beam is perpendicular to the first side surface, wherein the second direction is opposite to the first direction,

[0019]

[0020] S4. Measure the distance between the laser displacement sensor and the first side surface in S3 as B1. Further, rotate the indexing plate 90° in sequence, and measure the distances between the laser displacement sensor and the remaining three sides of the lower cuboid except the first side surface as B2, B3, and B4, respectively.

[0021] S5. Move the support rod upward so that the emitting end of the laser displacement sensor faces the upper rectangular parallelepiped. Further, rotate the indexing plate 90° in sequence, and measure the distances between the laser displacement sensor and the four sides of the upper rectangular parallelepiped, namely C1, C2, C3, and C4. The rotation direction of the indexing plate in S5 is consistent with that in S4.

[0022] S6. Performing milling and subtractive processing on the lower cuboid using a subtractive processing technique to obtain a milled lower cuboid;

[0023] S7. Move the support rod downward so that the emitting end of the laser displacement sensor faces the milled lower rectangular parallelepiped. Further, rotate the indexing plate 90° in sequence, and measure the distances D1, D2, D3, and D4 between the laser displacement sensor and the four sides of the milled lower rectangular parallelepiped. The rotation direction of the indexing plate in S7 is consistent with that in S4.

[0024] S8, calculated from the measurement results in S4, S5, and S7: Additive processing center O w Relative to the center of the index plate O m The relative coordinates of Subtractive Machining Center s Relative to the center of the index plate O m The relative coordinates of Among them, δ1, δ2, δ3, and δ4 are the errors in various directions caused by the standard block after being manufactured by the additive manufacturing process.

[0025] Preferably, in S5 , the support rod is moved upward by a first distance so that the bottom surface of the laser displacement sensor is flush with the bottom surface of the upper cuboid.

[0026] Preferably, in S7, the support rod is moved downward by a second distance so that the bottom surface of the laser displacement sensor is flush with the bottom surface of the lower cuboid after milling.

[0027] (3) Beneficial effects

[0028] Compared with the prior art, the present invention provides a non-contact coordinate center calibration device and method for additive and subtractive composite manufacturing, which has the following beneficial effects: the present invention can calculate the relative coordinates of the additive manufacturing center / subtractive manufacturing center relative to the center of the indexing disk through a high-precision laser displacement sensor, a flexible and adjustable bracket and a rotatable indexing disk, that is, it realizes the precise measurement and correction of the deviation between the additive manufacturing center, the subtractive manufacturing center and the indexing disk center in a non-contact manner, so as to feed back to the equipment control center to realize the corresponding offset correction, ensure the accuracy of the processing, effectively improve the accuracy and yield of additive and subtractive composite manufacturing, and has significant technological progress and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of a non-contact coordinate center calibration device, a dividing plate, and a standard block for additive and subtractive composite manufacturing according to the present invention;

[0030] Figure 2 Schematic diagram of the present invention for adjusting the laser beam to be perpendicular to the surface to be measured;

[0031] Figure 3 is a schematic diagram of an overall top view of the present invention for measurement;

[0032] Figure 4 This is a first top view schematic diagram of measuring the position of the lower cuboid in various directions according to the present invention;

[0033] Figure 5 This is a first top view schematic diagram of measuring the position of the upper cuboid in various directions according to the present invention;

[0034] Figure 6 This is a first top view schematic diagram of measuring the positions of the lower cuboid in various directions after milling according to the present invention;

[0035] Figure 7 A second top view schematic diagram of measuring the position of the lower cuboid in various directions according to the present invention;

[0036] Figure 8 A second top view schematic diagram of measuring the position of the upper cuboid in various directions according to the present invention;

[0037] Figure 9 This is a second top view schematic diagram of measuring the positions of the lower cuboid in various directions after milling according to the present invention.

[0038] The numbers in the figure are: 10-laser displacement sensor; 20-bracket; 201-support leg; 202-support rod; 203-mounting platform; 30-indexing plate; 40-standard block; 401-lower cuboid; 402-upper cuboid; 403-lower cuboid after milling; Ow-additive machining center; Os-subtractive machining center; Om-indexing plate center. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] The present invention provides a non-contact coordinate center calibration device for additive and subtractive manufacturing, comprising a laser displacement sensor 10 and a bracket 20. Bracket 20 includes a support rod 202 and a mounting platform 203. Support rod 202 is telescopically arranged, and mounting platform 203 is rotatably mounted on support rod 202. Laser displacement sensor 10 is mounted on mounting platform 203 and is used to measure the distance between itself and the surface of a measured part, which is placed on a rotatable indexing plate 30. Laser displacement sensor 10 is prior art and will not be described in detail herein.

[0041] Preferably, the bracket 20 further includes support legs 201. The upper and lower ends of the support rod 202 are connected to the mounting platform 203 and the support legs 201, respectively. The number of support legs 201 can be three. Furthermore, preferably, the support legs 201 are retractable to further enhance the flexibility and adjustability of the bracket 20. In this manner, the laser displacement sensor 10 can move up and down with the support legs 201 and support rod 202, and can rotate about the Z-axis (i.e., the support rod 202) with the mounting platform 203.

[0042] Specifically, the laser displacement sensor 10 can be installed on the mounting platform 203 by means of a snap connection or a bolt fastening connection.

[0043] Preferably, the mounting platform 203 is provided with a dial for determining its rotation angle; the laser displacement sensor 10 is provided with a display device for displaying the distance between it and the surface of the measured part. Specifically, the measurement error of the laser displacement sensor 10 is less than 0.1mm / 300mm.

[0044] In addition, the present invention also provides a non-contact coordinate center calibration method for additive and subtractive composite manufacturing, which utilizes the above-mentioned non-contact coordinate center calibration device for additive and subtractive composite manufacturing to perform additive and subtractive coordinate center calibration.

[0045] Preferably, the non-contact coordinate center calibration method for additive and subtractive composite manufacturing of the present invention specifically includes the following steps S1-S8:

[0046] S1. Place the part to be measured on the dividing plate 30. Specifically, the part to be measured is a standard block 40 manufactured by additive manufacturing. The standard block 40 includes a lower cuboid 401 and an upper cuboid 402. The lower cuboid 401 is placed on the dividing plate 30, and the upper cuboid 402 is placed on the lower cuboid 401. The additive manufacturing process centers of the lower cuboid 401 and the upper cuboid 402 are the same, and the sides are parallel to each other. The length of the lower cuboid 401 is E, and the width is F. The length of the upper cuboid 402 is G, and the width is H, wherein E>G, F>H.

[0047] S2. Install the laser displacement sensor on the mounting platform of the bracket, preferably adjusting the bottom surface of the laser displacement sensor to be flush with the bottom surface of the lower rectangular block; mark the emitting end of the laser displacement sensor facing one of the side surfaces of the lower rectangular block as the first side surface, that is, the laser displacement sensor can emit a laser beam to the first side surface; emit a laser beam through the laser displacement sensor to measure the distance between it and the first side surface as A1, further rotate the mounting platform together with the laser displacement sensor in a first direction by a first angle α1 and measure the distance between the laser displacement sensor and the first side surface at this time as A2, reset the mounting platform, that is, rotate the mounting platform in the opposite direction by the above-mentioned first angle α1.

[0048] S3, rotating the mounting platform together with the laser displacement sensor in a second direction by a second angle α2 so that the laser beam emitted by the laser displacement sensor is perpendicular to the first side surface, wherein the second direction is opposite to the first direction. like Figure 2 As shown, according to the cosine theorem, the above A3 can be obtained; further according to the cosine theorem, we can obtain Finally, according to the exterior angle = the sum of two non-adjacent interior angles, the second angle mentioned above can be obtained:

[0049]

[0050] S4. It can be understood that the laser beam emitted by the laser displacement sensor in the above S3 is perpendicular to the first side surface. At this time, the distance between the laser displacement sensor and the first side surface in S3 is further measured to be B1; further, the indexing plate is rotated 90° in sequence, and the distances between the laser displacement sensor and the remaining three sides of the lower rectangular parallelepiped except the first side surface are measured in sequence, which are B2, B3, and B4 respectively. For example, when the indexing plate is rotated 90° counterclockwise, the corresponding distance between the laser displacement sensor and the second side surface of the lower rectangular parallelepiped is B2. Similarly, the indexing plate is rotated in sequence and the above-mentioned B3 and B4 are measured. They will not be repeated here.

[0051] S5. Move the support rod upward so that the emitting end of the laser displacement sensor faces the upper cuboid. Preferably, the support rod can be moved upward by a first distance so that the bottom surface of the laser displacement sensor is flush with the bottom surface of the upper cuboid. Further, the dividing plate is rotated 90° in sequence, and the distances between the laser displacement sensor and the four side surfaces of the upper cuboid are measured in sequence, which are C1, C2, C3, and C4, respectively. The rotation direction of the dividing plate in S5 is consistent with the rotation direction in S4. For example, the rotation direction of the dividing plate in S4 and S5 is counterclockwise. The dividing plate is rotated 90° so that the laser beam of the laser displacement sensor is perpendicular to one of the side surfaces of the upper cuboid. At this time, the corresponding distance between the laser displacement sensor and one of the side surfaces of the upper cuboid is C1. Similarly, the dividing plate is rotated in sequence and the above-mentioned C2, C3, and C4 are measured.

[0052] S6. Perform milling and subtractive processing on the lower cuboid using a subtractive processing technique to obtain a milled lower cuboid.

[0053] S7. Move the support rod downward so that the emitting end of the laser displacement sensor faces the lower rectangular block after milling. Preferably, the support rod can be moved downward by a second distance so that the bottom surface of the laser displacement sensor is flush with the bottom surface of the lower rectangular block after milling. Further, the dividing plate is oriented and rotated 90° in sequence, and the distances between the laser displacement sensor and the four side surfaces of the lower rectangular block after milling are measured in sequence, which are D1, D2, D3, and D4, respectively. The rotation direction of the dividing plate in S7 is consistent with its rotation direction in S4.

[0054] S8, calculated from the measurement results in S4, S5, and S7: Additive processing center O w Relative to the center of the index plate O m The relative coordinates of Subtractive Machining Center s Relative to the center of the index plate O m The relative coordinates of Among them, δ1, δ2, δ3, and δ4 are the errors in various directions caused by the standard block after being manufactured by the additive manufacturing process.

[0055] It can be understood that the above-mentioned additive manufacturing process corresponds to the additive manufacturing module of the additive and subtractive composite manufacturing, and the additive manufacturing process center is the additive center or the additive manufacturing center; the subtractive manufacturing process corresponds to the subtractive manufacturing module of the additive and subtractive composite manufacturing, and the subtractive manufacturing process center is the subtractive center or the subtractive manufacturing center; the indexing center is the indexing center. w Relative to the center of the index plate O m The relative coordinates are: the additive coordinate center error in the X and Y directions, which is used to determine the deviation and offset between the additive machining process center and the indexing plate center; the subtractive machining process center O s Relative to the center of the index plate O m The relative coordinates are: the subtractive coordinate center errors in the X and Y directions, which are used to determine the deviation and offset between the subtractive machining process center and the indexing plate center.

[0056] Specifically, for the above S8, if Figure 7 As shown, O w It is the center of additive manufacturing. However, due to the large dimensional errors in additive manufacturing, the errors in different directions cannot be generalized. That is, there is an error δ1 on the left side of the standard block, an error δ3 on the right side, and so on. Generally speaking, the above errors are proportional to the size of the part. That is, the errors on the left and right sides of the lower rectangular block are δ1E and δ3E, respectively, where E is the length of the lower rectangular block. And O m is the center of the index plate, which can be understood as Figure 7 The center of the dotted circle. The above-mentioned additive manufacturing process center O w Relative to the center of the index plate O m The relative coordinates of The horizontal axis is the center error of the additive coordinate in the X direction (e.g. Figure 7 ⑤), which is achieved through Figure 7 ④-③ can be calculated; similarly, the additive coordinate center error in the Y direction can be calculated to obtain the additive machining process center O w Relative to the center of the index plate O m The relative coordinates of .

[0057] In addition, for the above S8, if Figure 7 、 Figure 8 As shown in the figure, since the additive manufacturing process center of the lower cuboid and the upper cuboid is the same, Figure 7 ④ is equal to Figure 8 ④: It can be introduced: By analogy, the other three errors can be obtained: In addition, the above-mentioned subtractive processing center O s Relative to the center of the index plate O m The relative coordinates of The horizontal coordinate is the center error of the subtractive coordinate in the X direction (such as Figure 9 ⑤), which is achieved through Figure 9 ④-③ can be calculated; similarly, the subtractive coordinate center error in the Y direction can be calculated to obtain the above subtractive machining process center O s Relative to the center of the index plate O m The relative coordinates of the material reduction will make the part (the lower cuboid) have the same length on both sides (such as Figure 9 The unknown length X at ① is eliminated after the calculation and is therefore not reflected in the calculation result.

[0058] Compared with the prior art, the present invention provides a non-contact coordinate center calibration device and method for additive and subtractive composite manufacturing, which has the following beneficial effects: the present invention can calculate the relative coordinates of the additive manufacturing center / subtractive manufacturing center relative to the center of the indexing disk through a high-precision laser displacement sensor, a flexible and adjustable bracket and a rotatable indexing disk, that is, it realizes the precise measurement and correction of the deviation between the additive manufacturing center, the subtractive manufacturing center and the indexing disk center in a non-contact manner, so as to feed back to the equipment control center to realize the corresponding offset correction, ensure the accuracy of the processing, effectively improve the accuracy and yield of additive and subtractive composite manufacturing, and has significant technological progress and practical value.

[0059] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A non-contact coordinate center calibration device for additive and subtractive composite manufacturing, characterized in that: include: A laser displacement sensor and a bracket, wherein the bracket includes a support rod and a mounting platform, the support rod is telescopically arranged up and down, the mounting platform is rotatably arranged on the support rod, and the laser displacement sensor is mounted on the mounting platform. The laser displacement sensor is used to measure the distance between it and the surface of the measured part, and the measured part is placed on a rotatable dividing plate.

2. The non-contact coordinate center calibration device for additive and subtractive composite manufacturing according to claim 1, characterized in that: The bracket further includes a support leg, and the upper and lower ends of the support rod are respectively connected to the mounting platform and the support leg.

3. The non-contact coordinate center calibration device for additive and subtractive composite manufacturing according to claim 2, characterized in that: The supporting legs are retractable.

4. The non-contact coordinate center calibration device for additive and subtractive composite manufacturing according to claim 1, characterized in that: The laser displacement sensor is mounted on the mounting platform by a snap-fit ​​connection or a bolt-fastening connection.

5. The non-contact coordinate center calibration device for additive and subtractive composite manufacturing according to claim 1, characterized in that: The mounting platform is provided with a dial for determining its rotation angle.

6. The non-contact coordinate center calibration device for additive and subtractive composite manufacturing according to claim 1, characterized in that: The laser displacement sensor is provided with a display device for displaying the distance between the laser displacement sensor and the surface of the measured part.

7. A non-contact coordinate center calibration method for additive and subtractive composite manufacturing, characterized by: The non-contact coordinate center calibration device for additive and subtractive composite manufacturing according to any one of claims 1 to 6 is used to calibrate the coordinate center of additive and subtractive materials.

8. The non-contact coordinate center calibration method for additive and subtractive composite manufacturing according to claim 7, characterized in that: The specific steps include: S1. Place the part to be measured on the indexing plate. Specifically, the part to be measured is a standard block manufactured by an additive manufacturing process. The standard block includes a lower cuboid and an upper cuboid. The lower cuboid is placed on the indexing plate, and the upper cuboid is placed on the lower cuboid. The additive manufacturing process centers of the lower and upper cuboids are the same, and the sides are parallel to each other. The length of the lower cuboid is E, and the width is F. The length of the upper cuboid is G, and the width is H, where E>G and F>H. S2. Direct the emitting end of the laser displacement sensor toward the first side surface of the lower rectangular parallelepiped, emit a laser beam through the laser displacement sensor to measure the distance between the first side surface and the laser displacement sensor as A1, further rotate the mounting platform together with the laser displacement sensor in a first direction by a first angle α1, measure the distance between the laser displacement sensor and the first side surface as A2, and reset the mounting platform. S3, rotating the mounting platform together with the laser displacement sensor in a second direction by a second angle α2 so that the laser beam is perpendicular to the first side surface, wherein the second direction is opposite to the first direction. S4. Measure the distance between the laser displacement sensor and the first side surface in S3 as B1. Further, rotate the indexing plate 90° in sequence, and measure the distances between the laser displacement sensor and the remaining three sides of the lower cuboid except the first side surface as B2, B3, and B4, respectively. S5. Move the support rod upward so that the emitting end of the laser displacement sensor faces the upper rectangular parallelepiped. Further, rotate the indexing plate 90° in sequence, and measure the distances C1, C2, C3, and C4 between the laser displacement sensor and the four sides of the upper rectangular parallelepiped in sequence. The rotation direction of the indexing plate in S5 is consistent with the rotation direction in S4. S6, performing milling and subtractive processing on the lower cuboid using a subtractive processing technique to obtain a milled lower cuboid; S7. Move the support rod downward so that the emitting end of the laser displacement sensor faces the milled lower rectangular parallelepiped. Further, rotate the indexing plate 90° in sequence, and measure the distances D1, D2, D3, and D4 between the laser displacement sensor and the four side surfaces of the milled lower rectangular parallelepiped. The rotation direction of the indexing plate in S7 is consistent with the rotation direction in S4. S8. Calculate and obtain the additive manufacturing process center O from the measurement results in S4, S5, and S7. w Relative to the center of the index plate O m The relative coordinates of Subtractive Machining Center s Relative to the center O of the indexing plate m The relative coordinates of Among them, δ1, δ2, δ3, and δ4 are the errors in various directions of the standard block after being manufactured by the additive manufacturing process.

9. The non-contact coordinate center calibration method for additive and subtractive composite manufacturing according to claim 8, characterized in that: In S5, the support rod is moved upward by a first distance so that the bottom surface of the laser displacement sensor is flush with the bottom surface of the upper cuboid.

10. The non-contact coordinate center calibration method for additive and subtractive composite manufacturing according to claim 8, characterized in that: In S7, the support rod is specifically moved downward by a second distance so that the bottom surface of the laser displacement sensor is flush with the bottom surface of the milled lower cuboid.

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