A method and apparatus for inspecting heat sink processing based on coordinate measuring machine (CMM)

Abstract

This invention provides a method and apparatus for inspecting heat sink processing based on coordinate measuring machine (CMM). The method includes: establishing a pre-plating inspection process CAD drawing; using CMM technology to obtain the actual number of heat sink holes, the actual coordinates of each heat sink hole, and the actual hole diameter on the heat sink after the CNC drilling process and before the CNC milling process; and outputting the CNC drilling process inspection results based on the pre-plating inspection process CAD drawing, the actual number of heat sink holes, their actual coordinates, and their actual hole diameters. Using CMM technology, the actual dimensions of the heat sink's outline and the actual center distance and symmetry of the positioning holes after the CNC milling process and before the plating process are obtained; and the CNC milling process inspection results are output based on the pre-plating inspection process CAD drawing, the actual dimensions of the outline, and the actual center distance of the positioning holes. This invention avoids problems such as misalignment between design and process datums, out-of-tolerance hole edge distances for positioning holes, low inspection accuracy, and large errors, ensuring inspection precision and accuracy.

Description

Technical Field

[0001] This invention belongs to the field of processing and inspection, and relates to the design technology of processing and inspection methods and devices, specifically to a method and device for processing and inspecting heat sinks based on coordinate measuring machine (CMM) measurement. Background Technology

[0002] Heat sink (e.g.) Figure 1 The part shown is a thin plate component, an essential heat dissipation device for aerospace computer modules. The material grade is mostly LY12-CZ, with a thickness of 1.2mm. The processing steps for the heat sink are: blanking → CNC drilling → CNC milling → countersinking by fitter → wiping → surface treatment: hard anodizing (film thickness 0.04-0.06mm) → fitter leveling.

[0003] During the manufacturing process, to ensure the heat sink maintains the required accuracy after hard anodizing, the process documents scale down the corresponding dimensions of the drawings during CNC milling of the outline to allow for a coating allowance in the hard anodized film. During inspection, based on the process drawings, after CNC drilling, traditional inspection methods are used, such as... Figure 2 The hole-punch file generated by the AutoCAD software is shown as a 1:1 scale photoplotter. Using this photoplotter to inspect the holes machined on the heat sink, the inspection error ranged from 0.2 to 0.3 mm, indicating low accuracy. Due to the large inspection error, after CNC milling the outline, the edge distance of the positioning holes was found to be out of tolerance, failing to meet the drawing accuracy requirements.

[0004] The aforementioned traditional detection method is as follows:

[0005] 1) Relative position of the detection holes

[0006] After the CNC drilling process, the prepared photoplotting film is placed on the heat sink plate. The three positioning holes on the photoplotting film are used for positioning and alignment. Then, the heat dissipation holes on the heat sink plate are visually inspected to see if they coincide with the holes on the photoplotting film, so as to determine the relative deviation of each heat dissipation hole.

[0007] 2) Inspect the accuracy of the outer contour

[0008] After the CNC milling of the outer contour, the hole edge distance and outer contour accuracy are checked using platform measurement technology according to the process drawings.

[0009] Traditional testing methods suffer from the problem of misalignment between design and process standards, which can easily lead to out-of-tolerance hole edge distances for positioning holes, resulting in low testing accuracy and large errors.

[0010] Therefore, there is a need to provide a heat sink processing and inspection method that can reduce inspection errors. Summary of the Invention

[0011] To address the technical problems of low accuracy and large errors in the detection of heat sinks after CNC milling of the outer contour, where the design datum and process datum do not coincide and the hole edge distance of the positioning holes easily exceeds the tolerance, this invention discloses a heat sink processing detection method and device based on coordinate measuring machine (CMM).

[0012] The technical solution to achieve the purpose of the invention is as follows:

[0013] This invention provides a method for inspecting the processing of heat sinks based on coordinate measuring machine (CMM) measurements, comprising:

[0014] Step 1: Based on the number of heat dissipation holes, the design coordinates and diameter of each heat dissipation hole, the design dimensions of the heat dissipation plate before plating, and the design center distance and symmetry design tolerance of the positioning holes, establish a CAD drawing of the pre-plating inspection process.

[0015] Step 2: Using coordinate measuring machine (CMM) technology, obtain the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual diameter of each heat dissipation hole on the heat dissipation plate after the CNC drilling process and before the CNC milling process. Based on the pre-plating inspection process CAD drawing, the actual number of heat dissipation holes, the actual coordinates, and the actual diameter of each hole, output the inspection results of the CNC drilling process.

[0016] Step 3: After the CNC drilling process of the heat sink plate passes inspection, a three-coordinate measurement technique is used to obtain the actual dimensions of the heat sink plate's outline after the CNC milling process and before the plating process, the actual center distance of the positioning holes, and the symmetry. Based on the CAD drawing of the pre-plating inspection process, the actual dimensions of the outline, the actual center distance of the positioning holes, and the symmetry, the inspection results of the CNC milling process are output.

[0017] Optionally, in step 2 above, the use of coordinate measuring machine (CMM) technology to obtain the actual number of heat dissipation holes on the heat sink after the CNC drilling process and before the CNC milling process, the actual coordinates of each heat dissipation hole, and the actual hole diameter, and outputting the CNC drilling process inspection results based on the pre-plating inspection process CAD drawing, the actual number of heat dissipation holes, the actual coordinates, and the actual hole diameter, includes:

[0018] Step 21: After the CNC drilling process and before the CNC milling process, a three-dimensional coordinate system is established using coordinate measuring technology. The system is based on a positioning hole on the heat sink as the origin, the line connecting the positioning hole at the origin and the positioning hole in the width direction of the heat sink as the X-axis, the line connecting the positioning hole at the origin and the positioning hole in the length direction of the heat sink as the Y-axis, and the line containing the thickness of the heat sink as the Z-axis.

[0019] Step 22: Based on the first three-dimensional coordinate system, extract the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual hole diameter of the heat dissipation plate after the CNC drilling process;

[0020] Step 23: Using the number of heat dissipation holes designed in the CAD drawing of the pre-plating inspection process, the design coordinates and design diameter of each heat dissipation hole, the number of heat dissipation holes, the relative position accuracy of each heat dissipation hole and the diameter accuracy are tested, and the CNC drilling process test results are output based on the test results.

[0021] Optionally, in step 23 above, the step of using the number of heat dissipation holes designed in the pre-plating inspection process CAD drawing, the design coordinates of each heat dissipation hole, and the design diameter of each heat dissipation hole to inspect the number of heat dissipation holes, the relative position accuracy of each heat dissipation hole, and the diameter accuracy, and outputting the inspection results of the CNC drilling process based on the inspection results, includes:

[0022] Step 231: When the actual number of heat dissipation holes is not equal to the designed number of heat dissipation holes, and / or the relative positional accuracy between the actual coordinates and the designed coordinates is >5‰, and / or the actual hole diameter is outside the range of the designed hole diameter, output a CNC drilling process detection failure signal;

[0023] Step 232: When the actual number of heat dissipation holes is equal to the designed number of heat dissipation holes, and the relative positional accuracy between the actual coordinates and the designed coordinates is ≤5‰, and the actual hole diameter is within the range of the designed hole diameter, output a CNC drilling process detection pass signal.

[0024] Optionally, in step 3 above, after the CNC drilling process of the heat sink plate passes inspection, coordinate measuring machine (CMM) technology is used to obtain the actual dimensions of the heat sink plate's outline after the CNC milling process and before the plating process, the actual center distance of the positioning holes, and the symmetry. Based on the pre-plating inspection process CAD drawing, the actual dimensions of the outline, the actual center distance of the positioning holes, and the symmetry, the CNC milling process inspection results are output, including:

[0025] Step 31: Using the first three-dimensional coordinate system, extract the actual dimensions of the heat sink outline after the milling process and before the plating process;

[0026] Step 32: After the CNC milling process and before the plating process, a three-coordinate measurement technology is used to establish a second three-dimensional coordinate system with the corner point of the center line of the heat sink outline length direction and the line connecting the two positioning holes in the width direction of the heat sink as the origin, the line connecting the two positioning holes in the width direction of the heat sink as the X-axis, the line connecting the center line of the heat sink outline length direction as the Y-axis, and the line connecting the thickness of the heat sink as the Z-axis.

[0027] Step 33: Using the second three-dimensional coordinate system, extract the actual center distance and symmetry of each positioning hole on the heat sink after the milling process and before the plating process;

[0028] Step 34: Using the actual center distance and symmetry of the positioning holes, the actual dimensions of the outer contour, the design dimensions of the outer contour, and the design tolerances of the center distance and symmetry of the positioning holes, output the inspection results of the CNC milling process.

[0029] In an improved embodiment, the above-mentioned heat sink processing inspection method based on coordinate measuring machine further includes:

[0030] A measurement dimension chain is established based on the outer contour dimensions of the heat sink after plating, the edge distance of the positioning holes after plating, the diameter of the positioning holes after plating, and the plating thickness.

[0031] Based on the measured dimension chain, the design dimensions of the heat sink before plating and the design center distance of the positioning holes are calculated using the extreme value method. The symmetry design tolerance of the positioning holes is determined based on the design center distance of the positioning holes.

[0032] This invention also provides a heat sink processing and inspection device based on coordinate measuring machine, comprising:

[0033] The pre-plating inspection process CAD drawing generation module is used to create a pre-plating inspection process CAD drawing based on the design number of heat dissipation holes, the design coordinates and design diameter of each heat dissipation hole, the design dimensions of the heat dissipation plate before plating, and the design center distance and symmetry design tolerance of the positioning holes.

[0034] The heat dissipation hole information extraction module is used to obtain the actual number of heat dissipation holes on the heat dissipation plate after the CNC drilling process and before the CNC milling process using coordinate measuring technology;

[0035] The outline and center distance extraction module is used to obtain the actual dimensions of the outline of the heat sink, the actual center distance of the positioning holes, and the symmetry after the CNC drilling process of the heat sink passes inspection, using coordinate measuring technology.

[0036] The detection result judgment and output module is used to output the detection results of the CNC drilling process based on the CAD drawing of the pre-plating inspection process, the actual number of heat dissipation holes, the actual coordinates, and the actual hole diameter; and to output the detection results of the CNC milling process based on the CAD drawing of the pre-plating inspection process, the actual dimensions of the outline, the actual center distance and symmetry of the positioning holes.

[0037] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the heat sink processing and inspection method based on three-coordinate measurement disclosed in this invention can avoid the problem of the design datum and process datum not coinciding, avoid the problem of the hole edge distance of the positioning hole being out of tolerance, low detection accuracy and large error, and ensure the detection precision and accuracy. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of a heat sink processing and inspection method based on coordinate measuring machine (CMM) disclosed in an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the first three-dimensional coordinate system established according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the second three-dimensional coordinate system established according to an embodiment of the present invention. Detailed Implementation

[0042] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0043] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features of the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] This invention provides a method for inspecting the processing of heat sinks based on coordinate measuring machine (CMM) measurements. See [link to relevant documentation]. Figure 1 As shown, it includes:

[0045] Step 1: Based on the number of heat dissipation holes, the design coordinates and diameter of each heat dissipation hole, the design dimensions of the heat dissipation plate before plating, and the design center distance and symmetry design tolerance of the positioning holes, establish a CAD drawing of the pre-plating inspection process.

[0046] Step 2: Using coordinate measuring machine (CMM) technology, obtain the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual diameter of each heat dissipation hole on the heat dissipation plate after the CNC drilling process and before the CNC milling process. Based on the pre-plating inspection process CAD drawing, the actual number of heat dissipation holes, the actual coordinates, and the actual diameter of each hole, output the inspection results of the CNC drilling process.

[0047] Step 3: After the CNC drilling process of the heat sink plate passes inspection, a three-coordinate measurement technique is used to obtain the actual dimensions of the heat sink plate's outline after the CNC milling process and before the plating process, the actual center distance of the positioning holes, and the symmetry. Based on the CAD drawing of the pre-plating inspection process, the actual dimensions of the outline, the actual center distance of the positioning holes, and the symmetry, the inspection results of the CNC milling process are output.

[0048] In the specific implementation of step 1, the design dimensions of the heat sink before plating can be obtained in the following way: based on the dimensions of the heat sink after plating and the plating thickness, a measurement dimension chain is established; based on the measurement dimension chain, the dimensions of the heat sink before plating are calculated using the extreme value method.

[0049] For example, when the outer contour dimensions of the heat sink after plating are When the coating thickness is 0.04-0.06 mm, the pre-plating inspection dimensions before hard anodizing can be calculated using the extreme value method.

[0050] Optionally, in step 2 above, the use of coordinate measuring machine (CMM) technology to obtain the actual number of heat dissipation holes on the heat sink after the CNC drilling process and before the CNC milling process, the actual coordinates of each heat dissipation hole, and the actual hole diameter, and outputting the CNC drilling process inspection results based on the pre-plating inspection process CAD drawing, the actual number of heat dissipation holes, the actual coordinates, and the actual hole diameter, includes:

[0051] Step 21: After the CNC drilling process and before the CNC milling process, a three-dimensional coordinate system is established using coordinate measuring technology. The system is based on a positioning hole on the heat sink as the origin, the line connecting the positioning hole at the origin and the positioning hole in the width direction of the heat sink as the X-axis, the line connecting the positioning hole at the origin and the positioning hole in the length direction of the heat sink as the Y-axis, and the line containing the thickness of the heat sink as the Z-axis.

[0052] In specific implementation, the first three-dimensional coordinate system established is referred to Figure 2As shown, establish the Z-axis with the front side (thickness direction) of the heat sink and zero it; establish the Y1 axis by connecting the centers of the corresponding positioning holes (i.e., two positioning holes on the same side of the heat sink) along the length of the heat sink; similarly establish the X1 axis; fix the Z-axis, take the center of the positioning hole as the origin, and zero the X1 and Y1 axes according to the right-hand rule.

[0053] Step 22: Based on the first three-dimensional coordinate system, extract the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual hole diameter of the heat dissipation plate after the CNC drilling process.

[0054] In practice, after the CNC drilling process, the heat dissipation holes of the heat dissipation plate can be scanned from top to bottom and from left to right to obtain the actual number of heat dissipation holes, and the actual coordinates (Xi, Yi, Zi) of each heat dissipation hole can be extracted in sequence, where i is the i-th heat dissipation hole.

[0055] Step 23: Using the number of heat dissipation holes designed in the CAD drawing of the pre-plating inspection process, the design coordinates and design diameter of each heat dissipation hole, the number of heat dissipation holes, the relative position accuracy of each heat dissipation hole and the diameter accuracy are tested, and the CNC drilling process test results are output based on the test results.

[0056] It should be noted that when comparing the actual coordinates of each heat dissipation hole with the design coordinates of each heat dissipation hole in the CAD drawing of the pre-plating inspection process, it is necessary to ensure that the positions of the heat dissipation holes being compared are in one-to-one correspondence.

[0057] Optionally, in step 23 above, the step of using the number of heat dissipation holes designed in the pre-plating inspection process CAD drawing, the design coordinates of each heat dissipation hole, and the design diameter of each heat dissipation hole to inspect the number of heat dissipation holes, the relative position accuracy of each heat dissipation hole, and the diameter accuracy, and outputting the inspection results of the CNC drilling process based on the inspection results, includes:

[0058] Step 231: When the actual number of heat dissipation holes is not equal to the designed number of heat dissipation holes, and / or the relative positional accuracy between the actual coordinates and the designed coordinates is >5‰, and / or the actual hole diameter is outside the range of the designed hole diameter, output a CNC drilling process failure signal.

[0059] In practice, the actual number of heat dissipation holes may not be equal to the designed number of heat dissipation holes. There may be cases of missing holes or multiple holes during processing. If multiple holes occur, a signal indicating that the CNC drilling process has failed can be directly output. If missing holes occur, on the one hand, a signal indicating that the CNC drilling process has failed can be directly output, and on the other hand, the specific location of the missing hole can be located, which is convenient for re-drilling the heat dissipation plate according to the design.

[0060] Step 232: When the actual number of heat dissipation holes is equal to the designed number of heat dissipation holes, and the relative positional accuracy between the actual coordinates and the designed coordinates is ≤5‰, and the actual hole diameter is within the range of the designed hole diameter, output a CNC drilling process detection pass signal.

[0061] In practice, the design aperture range can be set to Φ2.05~Φ2.15mm.

[0062] Optionally, in step 3 above, after the CNC drilling process of the heat sink plate passes inspection, coordinate measuring machine (CMM) technology is used to obtain the actual dimensions of the heat sink plate's outline after the CNC milling process and before the plating process, the actual center distance of the positioning holes, and the symmetry. Based on the pre-plating inspection process CAD drawing, the actual dimensions of the outline, the actual center distance of the positioning holes, and the symmetry, the CNC milling process inspection results are output, including:

[0063] Step 31: Using the first three-dimensional coordinate system, extract the actual dimensions of the heat sink outline after the milling process and before the plating process.

[0064] Step 32: After the CNC milling process and before the plating process, a second three-dimensional coordinate system is established using coordinate measuring machine (CMM) technology. The origin is the corner point of the line connecting the center line of the heat sink outline length direction and the line connecting the two positioning holes in the width direction of the heat sink. The X-axis is the line connecting the two positioning holes in the width direction of the heat sink. The Y-axis is the line connecting the center line of the heat sink outline length direction. The Z-axis is the line connecting the thickness of the heat sink.

[0065] In specific implementation, the established second three-dimensional coordinate system is referred to Figure 3 As shown, establish the Z2 axis with the front side of the heat sink (i.e., the thickness direction of the heat sink) and zero the Z2 axis; establish the Y2 axis along the length direction of the heat sink by connecting the hollow lines of the two corresponding positioning holes (i.e., the two positioning holes located along the length direction of the heat sink and on the same side of the heat sink); the method for establishing the X2 axis is the same as that for the Y2 axis; fix the Z2 axis, and take the intersection of the center line of the outer contour length direction and the line connecting the center of the two corresponding positioning holes (i.e., the two positioning holes located along the width direction of the heat sink and on the same side of the heat sink) as the origin of the coordinate system. According to the right-hand rule, zero the X2 axis and the Y2 axis. After the coordinate system is established, directly measure the center distance of the positioning holes (168±0.02mm) and the symmetry of the positioning holes.

[0066] Step 33: Using the second three-dimensional coordinate system, extract the actual center distance and symmetry of each positioning hole on the heat sink after the milling process and before the plating process;

[0067] Step 34: Using the actual center distance and symmetry of the positioning holes, the actual dimensions of the outer contour, the design dimensions of the outer contour, and the design tolerances of the center distance and symmetry of the positioning holes, output the inspection results of the CNC milling process.

[0068] In an improved embodiment, the above-mentioned heat sink processing inspection method based on coordinate measuring machine further includes:

[0069] A measurement dimension chain is established based on the outer contour dimensions of the heat sink after plating, the edge distance of the positioning holes after plating, the diameter of the positioning holes after plating, and the plating thickness.

[0070] Based on the measured dimension chain, the design dimensions of the heat sink before plating and the design center distance of the positioning holes are calculated using the extreme value method. The symmetry design tolerance of the positioning holes is determined based on the design center distance of the positioning holes.

[0071] This invention also provides a heat sink processing and inspection device based on coordinate measuring machine, comprising:

[0072] The pre-plating inspection process CAD drawing generation module is used to create a pre-plating inspection process CAD drawing based on the design number of heat dissipation holes, the design coordinates and design diameter of each heat dissipation hole, the design dimensions of the heat dissipation plate before plating, and the design center distance and symmetry design tolerance of the positioning holes.

[0073] The heat dissipation hole information extraction module is used to obtain the actual number of heat dissipation holes on the heat dissipation plate after the CNC drilling process and before the CNC milling process using coordinate measuring technology;

[0074] The outline and center distance extraction module is used to obtain the actual dimensions of the outline of the heat sink, the actual center distance of the positioning holes, and the symmetry after the CNC drilling process of the heat sink passes inspection, using coordinate measuring technology.

[0075] The detection result judgment and output module is used to output the detection results of the CNC drilling process based on the CAD drawing of the pre-plating inspection process, the actual number of heat dissipation holes, the actual coordinates, and the actual hole diameter; and to output the detection results of the CNC milling process based on the CAD drawing of the pre-plating inspection process, the actual dimensions of the outline, the actual center distance and symmetry of the positioning holes.

[0076] The embodiments of the present invention achieve the following technical effects: The heat sink processing and inspection method based on three-coordinate measurement disclosed in the present invention can avoid the problems of non-coincidence between design datum and process datum, resulting in excessive hole edge distance of positioning holes, low detection accuracy and large error, thus ensuring detection precision and accuracy.

[0077] Obviously, those skilled in the art should understand that the modules or steps of the above-described embodiments of the present invention can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the embodiments of the present invention are not limited to any particular hardware and software combination.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing and inspecting heat sinks based on coordinate measuring machine (CMM), characterized in that, include: Step 1: Based on the number of heat dissipation holes, the design coordinates and diameter of each heat dissipation hole, the design dimensions of the heat dissipation plate before plating, and the design center distance and symmetry design tolerance of the positioning holes, establish a CAD drawing of the pre-plating inspection process. Step 2: Using coordinate measuring machine (CMM) technology, obtain the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual diameter of each heat dissipation hole on the heat dissipation plate after the CNC drilling process and before the CNC milling process. Based on the pre-plating inspection process CAD drawing, the actual number of heat dissipation holes, the actual coordinates, and the actual diameter of each hole, output the inspection results of the CNC drilling process. Step 3: After the CNC drilling process of the heat sink plate passes inspection, coordinate measuring machine (CMM) technology is used to obtain the actual dimensions of the heat sink plate's outline after the CNC milling process and before the plating process, the actual center distance of the positioning holes, and the symmetry. Based on the pre-plating inspection process CAD drawing, the actual dimensions of the outline, and the actual center distance and symmetry of the positioning holes, the CNC milling process inspection results are output, including: Step 31: Using the first three-dimensional coordinate system, extract the actual dimensions of the heat sink outline after the milling process and before the plating process; Step 32: After the CNC milling process and before the plating process, a three-coordinate measurement technology is used to establish a second three-dimensional coordinate system with the corner point of the center line of the heat sink outline length direction and the line connecting the two positioning holes in the width direction of the heat sink as the origin, the line connecting the two positioning holes in the width direction of the heat sink as the X-axis, the line connecting the center line of the heat sink outline length direction as the Y-axis, and the line connecting the thickness of the heat sink as the Z-axis. Step 33: Using the second three-dimensional coordinate system, extract the actual center distance and symmetry of each positioning hole on the heat sink after the milling process and before the plating process; Step 34: Using the actual center distance and symmetry of the positioning holes, the actual dimensions of the outline, the design dimensions of the outline, and the design tolerances of the center distance and symmetry of the positioning holes, output the inspection results of the CNC milling process.

2. The heat sink processing and inspection method based on coordinate measuring machine according to claim 1, characterized in that, In step 2, the three-coordinate measurement technology is used to obtain the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual diameter of the heat dissipation plate after the CNC drilling process and before the CNC milling process. Based on the pre-plating inspection process CAD drawing, the actual number of heat dissipation holes, the actual coordinates, and the actual diameter of the holes, the inspection results of the CNC drilling process are output, including: Step 21: After the CNC drilling process and before the CNC milling process, a three-dimensional coordinate system is established using coordinate measuring technology. The system is based on a positioning hole on the heat sink as the origin, the line connecting the positioning hole at the origin and the positioning hole in the width direction of the heat sink as the X-axis, the line connecting the positioning hole at the origin and the positioning hole in the length direction of the heat sink as the Y-axis, and the line containing the thickness of the heat sink as the Z-axis. Step 22: Based on the first three-dimensional coordinate system, extract the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole, and the actual hole diameter of the heat dissipation plate after the CNC drilling process; Step 23: Using the number of heat dissipation holes designed in the CAD drawing of the pre-plating inspection process, the design coordinates and design diameter of each heat dissipation hole, the number of heat dissipation holes, the relative position accuracy of each heat dissipation hole and the diameter accuracy are tested, and the CNC drilling process test results are output based on the test results.

3. The heat sink processing and inspection method based on coordinate measuring machine according to claim 2, characterized in that, In step 23, the number of heat dissipation holes, the design coordinates of each heat dissipation hole, and the design diameter of each heat dissipation hole are used in the CAD drawing of the pre-plating inspection process to detect the number of heat dissipation holes, the relative position accuracy of each heat dissipation hole, and the diameter accuracy. Based on the detection results, the CNC drilling process inspection results are output, including: Step 231: When the actual number of heat dissipation holes is not equal to the designed number of heat dissipation holes, and / or the relative positional accuracy between the actual coordinates and the designed coordinates is >5‰, and / or the actual hole diameter is outside the range of the designed hole diameter, output a CNC drilling process detection failure signal; Step 232: When the actual number of heat dissipation holes is equal to the designed number of heat dissipation holes, and the relative positional accuracy between the actual coordinates and the designed coordinates is ≤5‰, and the actual hole diameter is within the range of the designed hole diameter, output a CNC drilling process detection pass signal.

4. The heat sink processing and inspection method based on coordinate measuring machine according to any one of claims 1 to 3, characterized in that, Also includes: A measurement dimension chain is established based on the outer contour dimensions of the heat sink after plating, the edge distance of the positioning holes after plating, the diameter of the positioning holes after plating, and the plating thickness. Based on the measured dimension chain, the design dimensions of the heat sink before plating and the design center distance of the positioning holes are calculated using the extreme value method. The symmetry design tolerance of the positioning holes is determined based on the design center distance of the positioning holes.

5. A heat sink processing and inspection device based on coordinate measuring machine (CMM), used to implement the method as described in any one of claims 1 to 4, characterized in that, include: The pre-plating inspection process CAD drawing generation module is used to create a pre-plating inspection process CAD drawing based on the design number of heat dissipation holes, the design coordinates and design diameter of each heat dissipation hole, the design dimensions of the heat dissipation plate before plating, and the design center distance and symmetry design tolerance of the positioning holes. The heat dissipation hole information extraction module is used to obtain the actual number of heat dissipation holes on the heat dissipation plate after the CNC drilling process and before the CNC milling process using coordinate measuring technology; The outline and center distance extraction module is used to obtain the actual dimensions of the outline of the heat sink, the actual center distance of the positioning holes, and the symmetry after the CNC drilling process of the heat sink passes inspection, using coordinate measuring technology. The test result judgment and output module is used to output the test results of the CNC drilling process based on the CAD drawing of the pre-plating test process, the actual number of heat dissipation holes, the actual coordinates and the actual hole diameter; This tool is used to output the inspection results of the CNC milling process based on the CAD drawing of the pre-plating inspection process, the actual dimensions of the outline, the actual center distance and symmetry of the positioning holes.

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