CN-117884953-B - Three-coordinate measurement-based heat radiation plate processing detection method and device

CN117884953BCN 117884953 BCN117884953 BCN 117884953BCN-117884953-B

Abstract

The invention provides a method and a device for detecting machining of a radiating plate based on three-coordinate measurement, wherein the method comprises the steps of establishing a CAD graph of a detection process before plating, acquiring the actual number of radiating holes on the radiating plate after a numerical control drilling process and before a contour process by adopting a three-coordinate measurement technology, outputting the detection result of the numerical control drilling process according to the CAD graph of the detection process before plating, the actual number of the radiating holes, the actual coordinates and the actual aperture, acquiring the actual size of the contour of the radiating plate after the contour process and before the plating process, the actual center distance and the symmetry degree of the positioning holes by adopting the three-coordinate measurement technology, and outputting the detection result of the contour process after the contour process by adopting the numerical control measurement technology according to the CAD graph, the actual size of the contour and the actual center distance of the positioning holes before the contour process. The method provided by the invention avoids the problems of misalignment of the design reference and the process reference, out-of-tolerance hole edge distance of the positioning holes, low detection accuracy and large error, and ensures the detection precision and accuracy.

Inventors

DENG YUNCHANG
CHEN KUI
LI QUANDONG
Jiang Junfan
WU TONG

Assignees

中国航空工业集团公司西安航空计算技术研究所

Dates

Publication Date: 20260505
Application Date: 20231227

Claims (5)

1. A heat radiation plate processing detection method based on three-coordinate measurement is characterized by comprising the following steps: Step 1, establishing a pre-plating detection process CAD graph according to the design number of radiating holes, the design coordinates and the design aperture of each radiating hole, the design size of the outline of the radiating plate before plating, the design center distance and the symmetry degree design tolerance of the positioning holes; Step 2, acquiring the actual number of radiating holes on a radiating plate after a numerical control drilling process and before a shape milling process, the actual coordinates and the actual aperture of each radiating hole by adopting a three-coordinate measurement technology, and outputting a detection result of the numerical control drilling process according to the CAD graph of the detection process before plating, the actual number of the radiating holes, the actual coordinates and the actual aperture; Step 3, after the detection of the numerical control drilling process of the cooling plate passes, acquiring the actual dimension of the outline of the cooling plate, the actual center distance and the symmetry degree of the positioning hole after the outline milling process and before the plating process by adopting a three-coordinate measurement technology, and outputting the detection result of the outline milling process according to the CAD graph of the detection process before plating, the actual dimension of the outline, the actual center distance and the symmetry degree of the positioning hole, wherein the method comprises the following steps: step 31, extracting the actual dimension of the outline of the heat radiation plate after the outline milling process and before the plating process by using a first three-dimensional coordinate system; Step 32, after the contour milling process and before the coating process, a second three-dimensional coordinate system is established by adopting a three-coordinate measurement technology, taking the corner point of the connecting line between the central line of the contour of the radiating plate in the length direction and the connecting line of the two positioning holes in the width direction of the radiating plate as an origin, taking the straight line of the connecting line of the two positioning holes in the width direction of the radiating plate as an X axis, taking the straight line of the central line of the contour of the radiating plate in the length direction as a Y axis and taking the straight line of the thickness of the radiating plate as a Z axis; step 33, extracting the actual center distance and symmetry of each positioning hole on the cooling plate after the contour milling process and before the coating process by using a second three-dimensional coordinate system; And step 34, outputting a detection result of the milling appearance procedure by using the actual center distance and symmetry of the positioning holes, the actual dimension of the appearance outline, the design dimension of the appearance outline and the design center distance and symmetry design tolerance of the positioning holes.
2. The method for detecting the processing of the heat dissipation plate based on three-dimensional measurement according to claim 1, wherein in the step 2, the three-dimensional measurement technique is adopted to obtain the actual number of heat dissipation holes of the heat dissipation plate after the numerical control drilling process and before the shape milling process, the actual coordinates and the actual aperture of each heat dissipation hole, and output the detection result of the numerical control drilling process according to the CAD drawing of the detection process before plating, the actual number of heat dissipation holes, the actual coordinates and the actual aperture, and the method comprises the following steps: Step 21, after a numerical control drilling process and before a shape milling process, a three-dimensional coordinate system is established by adopting a three-coordinate measurement technology, taking one positioning hole on a radiating plate as an original point, taking a straight line where a connecting line between the positioning hole at the original point and the positioning hole in the width direction of the radiating plate is positioned as an X axis, taking a straight line where a connecting line between the positioning hole at the original point and the positioning hole in the length direction of the radiating plate is positioned as a Y axis, and taking a straight line where the thickness of the radiating plate is positioned as a Z axis; Step 22, extracting the actual number of the radiating holes of the radiating plate, the actual coordinates and the actual aperture of each radiating hole after the numerical control drilling process according to the first three-dimensional coordinate system; and step 23, detecting the number of the radiating holes, the relative position precision and the aperture precision of each radiating hole by using the design number of the radiating holes, the design coordinates and the design aperture of each radiating hole in the CAD graph of the pre-plating detection process, and outputting the detection result of the numerical control drilling procedure according to the detection result.
3. The method for detecting the processing of the heat dissipation plate based on three-dimensional measurement according to claim 2, wherein in step 23, the detecting the number of heat dissipation holes, the relative position accuracy and the aperture accuracy of each heat dissipation hole by using the number of heat dissipation holes, the design coordinates and the design aperture of each heat dissipation hole in the CAD drawing of the pre-plating detection process, and outputting the detection result of the numerical control drilling process according to the detection result comprises: step 231, outputting a numerical control drilling process detection non-passing signal when the actual number of the radiating holes is not equal to the designed number of the radiating holes, and/or the relative position accuracy between the actual coordinates and the designed coordinates is greater than 5 per mill, and/or the actual aperture is out of the range of the designed aperture; And 232, outputting a numerical control drilling process detection passing signal when the actual number of the radiating holes is equal to the design number of the radiating holes, the relative position precision between the actual coordinates and the design coordinates is less than or equal to 5 per mill, and the actual aperture is within the range of the design aperture.
4. A heat radiation plate processing detection method based on three-coordinate measurement as claimed in any one of claims 1 to 3, further comprising: establishing a measurement dimension chain according to the outline dimension of the heat radiation plate after plating, the edge distance of the positioning hole after plating, the positioning aperture after plating and the thickness of the plating layer; And calculating the design size of the outline of the heat radiation plate before plating and the design center distance of the positioning hole by adopting an extremum method according to the measurement size chain, and determining the symmetry degree design tolerance of the positioning hole according to the design center distance of the positioning hole.
5. A heat radiation plate processing detection apparatus based on three-coordinate measurement for realizing the method as claimed in any one of claims 1 to 4, comprising: The pre-plating detection process CAD graph generating module is used for establishing a pre-plating detection process CAD graph according to the design number of the radiating holes, the design coordinates and the design aperture of each radiating hole, the design size of the outline of the radiating plate before plating, the design center distance and the symmetry degree design tolerance of the positioning holes; The heat dissipation hole related information extraction module is used for acquiring the actual number of heat dissipation holes, the actual coordinates of each heat dissipation hole and the actual aperture of the heat dissipation plate after the numerical control drilling process and before the shape milling process by adopting a three-coordinate measurement technology; The outline and center distance extraction module is used for acquiring the actual size of the outline of the heat radiation plate, the actual center distance and symmetry of the positioning hole after the outline milling process and before the coating process by adopting a three-coordinate measurement technology after the detection of the numerical control drilling process of the heat radiation plate passes; The detection result judging and outputting module is used for outputting a numerical control drilling procedure detection result according to the pre-plating detection process CAD graph, the actual number of the radiating holes, the actual coordinates and the actual aperture, and outputting a numerical control milling procedure detection result according to the pre-plating detection process CAD graph, the actual size of the outline, the actual center distance and the symmetry degree of the positioning holes.

Description

Three-coordinate measurement-based heat radiation plate processing detection method and device Technical Field The invention belongs to the field of machining detection, relates to a machining detection method and a device design technology, and particularly relates to a three-coordinate measurement-based radiating plate machining detection method and a three-coordinate measurement-based radiating plate machining detection device. Background The heat dissipation plate (shown in fig. 1) belongs to a thin plate type part, and is a heat dissipation device necessary for an aviation computer module, and the material number is LY12-CZ, and the thickness is 1.2mm. The processing process of the heat radiation plate comprises blanking, numerical control drilling, shape milling, countersinking by a fitter, rubbing the plate, surface treatment of hard anodic oxidation (the thickness of a film is 0.04-0.06 mm), and leveling by the fitter. In the processing process, in order to ensure that the precision required by the drawing can be met after the hard anodic oxidation of the heat dissipation plate, the corresponding drawing size is scaled when the outline is milled by the process file, so that the plating allowance is reserved on the hard anodic oxidation film layer. In the detection process, according to the process drawing, after the numerical control drilling procedure is processed, a traditional detection method is adopted, an optical drawing negative film with the ratio of 1:1 is manufactured by using a punching file graph converted and generated by AutoCAD software as shown in fig. 2, the optical drawing negative film is used for detecting the hole position processed on the heat dissipation plate, the detection error range is 0.2-0.3 mm, and the test accuracy is low. Because the detection error is large, after the working procedure of milling the outline, the margin of the positioning hole is found to be out of tolerance, and the drawing precision cannot be met. The traditional detection method comprises the following steps: 1) Detecting the relative position of holes After the numerical control drilling procedure is processed, the manufactured photo-drawn negative is placed on the heat radiation plate, 3 positioning holes on the photo-drawn negative are used for positioning and aligning, and then whether the heat radiation holes of the heat radiation plate are overlapped with the holes on the photo-drawn negative or not is visually checked, so that the relative deviation of each heat radiation hole is judged. 2) Detecting outline accuracy After the working procedure of milling the outline, the edge distance and the outline precision of the hole are detected by adopting a platform measurement technology according to the process drawing. The traditional detection method has the problem that the design reference is not coincident with the process reference, and the out-of-tolerance of the hole edge distance of the positioning hole is easy to cause, so that the detection accuracy is lower, and the error is larger. Therefore, it is desirable to provide a heat sink processing detection method that can reduce detection errors. Disclosure of Invention The invention discloses a method and a device for processing and detecting a cooling plate based on three-coordinate measurement, and aims to solve the technical problems that after a process of milling an outline of a cooling plate, a traditional detection method is adopted to detect that a design reference is not coincident with a process reference, and the hole edge distance of a positioning hole is easy to cause out-of-tolerance, so that the detection accuracy is low and the error is large. The technical scheme for realizing the aim of the invention is as follows: the embodiment of the invention provides a method for detecting the processing of a radiating plate based on three-coordinate measurement, which comprises the following steps: Step 1, establishing a pre-plating detection process CAD graph according to the design number of radiating holes, the design coordinates and the design aperture of each radiating hole, the design size of the outline of the radiating plate before plating, the design center distance and the symmetry degree design tolerance of the positioning holes; Step 2, acquiring the actual number of radiating holes on a radiating plate after a numerical control drilling process and before a shape milling process, the actual coordinates and the actual aperture of each radiating hole by adopting a three-coordinate measurement technology, and outputting a detection result of the numerical control drilling process according to the CAD graph of the detection process before plating, the actual number of the radiating holes, the actual coordinates and the actual aperture; and 3, after the numerical control drilling process of the cooling plate passes the detection, acquiring the actual dimension of the outline of the cooling plate, the actual center distance