CN-116296430-B - Method for obtaining coupling relation between surface morphology and coating appearance of automobile outer covering part

CN116296430BCN 116296430 BCN116296430 BCN 116296430BCN-116296430-B

Abstract

The invention discloses a method for acquiring a coupling relation between the surface appearance and the coating appearance of an automobile outer covering part, which comprises the steps of utilizing the shape of a target covering part to perform strain measurement grid printing treatment on a first set of samples to acquire target deformation and target bulging height of the first set of samples, utilizing the target bulging height to perform bulging tests and coating hanging piece tests on a second set of samples and a third set of samples, performing coating appearance detection on the second set of samples and the third set of samples after the coating hanging piece test is completed to acquire target surface roughness characteristic parameters and target detection results, and performing regression analysis treatment on the target surface roughness characteristic parameters, the target detection results and the first surface roughness characteristic parameters of the first set of samples to acquire the coupling relation between the surface appearance and the coating appearance of the automobile outer covering part. The method for acquiring the coupling relation between the surface morphology and the coating appearance of the automobile outer covering part can acquire the coupling relation between the surface morphology and the coating appearance of the automobile outer covering part.

Inventors

HAO YULIN
MA WENYU
CAO JIANPING
LI CHUNGUANG
CAI NING
LONG YUAN
Yao Shicong
LI MIN
YAN CHENXI
LI XUETAO
E HONGWEI

Assignees

首钢集团有限公司

Dates

Publication Date: 20260512
Application Date: 20221226

Claims (10)

1. A method of obtaining a coupling relationship between a surface topography of an automotive exterior cover and a painted appearance, the method comprising: performing strain measurement grid printing processing on a first set of samples by using the shape of a target covering piece, and acquiring a target deformation amount of the first set of samples and a target bulging height corresponding to the target deformation amount when the shape of the first set of samples is changed into the shape of the target covering piece, wherein the first set of samples comprises a plurality of samples; Performing bulging tests on a second set of samples and a third set of samples by using the target bulging height to obtain target surface roughness characteristic parameters, wherein the target surface roughness characteristic parameters comprise a second surface roughness characteristic parameter corresponding to the second set of samples and a third surface roughness characteristic parameter of the third set of samples, and the second set of samples and the third set of samples are identical and comprise a plurality of samples with different surface morphologies; Coating hanging piece tests are carried out on the second set of samples and the third set of samples, wherein the hanging piece positions are the positions of the target covering pieces in the coating hanging piece test process, the second set of samples sequentially complete pretreatment and electrophoresis treatment in the coating hanging piece treatment process, and the third set of samples sequentially complete pretreatment, electrophoresis treatment and paint spraying treatment in the coating hanging piece treatment process; performing coating appearance detection on the second set of samples and the third set of samples after finishing the coating hanging piece test to obtain target detection results, wherein the target detection results comprise detection results of the second set of samples and detection results of the third set of samples; And carrying out regression analysis processing by utilizing the target surface roughness characteristic parameter, the target detection result and the first surface roughness characteristic parameter of the first set of samples to obtain the coupling relation between the surface appearance and the coating appearance of the automobile outer covering part.
2. The method of claim 1, wherein performing regression analysis using the target surface roughness characteristic parameter, the target detection result, and the first surface roughness characteristic parameter of the first set of samples to obtain a coupling relationship between a surface topography of an automobile outer panel and a coating appearance comprises: If the detection result of the second set of samples comprises a target Ra value of the roughness of the electrophoretic paint film of the second set of samples, a first regression relation between the surface roughness characteristic parameter and the Ra value is established by utilizing the target Ra value, the target surface roughness characteristic parameter and the first surface roughness characteristic parameter; If the detection result of the third set of samples comprises a target DOI value of finish paint distinctness of the third set of samples, a second regression relation between the surface roughness characteristic parameter and the DOI value is established by using the target DOI value, the target surface roughness characteristic parameter and the first surface roughness characteristic parameter; And acquiring the coupling relation according to the first regression relation and the second regression relation.
3. The method of claim 2, wherein said establishing a first regression relationship of surface roughness characteristics parameters and Ra values using said target Ra value, said target surface roughness characteristics parameters and said first surface roughness characteristics parameters comprises: and establishing a first multi-element linear relationship between the surface roughness characteristic parameter and the Ra value by using the target Ra value, the target surface roughness characteristic parameter and the first surface roughness characteristic parameter, wherein the first multi-element linear relationship is the first regression relationship.
4. A method as recited in claim 3, wherein said establishing a second regression relationship of surface roughness characteristics parameters and DOI values using said target DOI value, said target surface roughness characteristics parameters and said first surface roughness characteristics parameters comprises: And establishing a second multi-element linear relationship between the surface roughness characteristic parameter and the DOI value by using the target DOI value, the target surface roughness characteristic parameter and the first surface roughness characteristic parameter, wherein the second multi-element linear relationship is used as the second regression relationship.
5. The method of claim 1, wherein said performing a bulge test on the second set of samples and the third set of samples using the target bulge height to obtain the target surface roughness profile comprises: performing a bulging test on the second set of samples by using the target bulging height to obtain second surface roughness characteristic parameters, wherein the second surface roughness characteristic parameters comprise at least 3 of Ra, RPc, rz, rmax, rt, R z and Wsa 1-5; And performing a bulging test on the third set of samples by using the target bulging height to obtain third surface roughness characteristic parameters, wherein the third surface roughness characteristic parameters comprise at least 3 of Ra, RPc, rz, rmax, rt, R z and Wsa1-5, and the target surface roughness characteristic parameters comprise the second surface roughness characteristic parameters and the third surface roughness characteristic parameters.
6. The method of claim 5, wherein the performing a strain measurement grid printing process on the first set of samples using the shape of the target cover, and when the shape of the first set of samples changes to the shape of the target cover, obtaining a target deformation amount of the first set of samples and a target bulging height corresponding to the target deformation amount, comprises: performing strain measurement grid printing processing on a first sample in the first set of samples, and acquiring the deformation of the first sample as the target deformation when the shape of the first sample is changed into the shape of the target covering piece; And performing strain measurement grid printing treatment on a second sample in the first set of samples, and performing bulging tests under different bulging heights to obtain the bulging height of the second sample as the target bulging height, wherein the second sample is all the rest samples except the first sample in the first set of samples.
7. The method of claim 2, wherein each of the second and third sets of samples has a surface roughness characteristic having a Ra value of 0.5um to 1.5um, a RPc value of 50/cm to 150/cm, and a Wsa1-5 value of 0.1um to 0.5um, wherein any two of the second and third sets of samples have a Ra difference of greater than 0.4um, a RPc difference of greater than 5/cm, and a Wsa1-5 difference of greater than 0.02um.
8. An apparatus for obtaining a coupling relationship between a surface topography of an automotive exterior cover and a painted appearance, the apparatus comprising: A target parameter obtaining unit, configured to perform strain measurement grid printing processing on a first set of samples by using a shape of a target covering member, and obtain a target deformation amount of the first set of samples and a target bulging height corresponding to the target deformation amount when the shape of the first set of samples becomes the shape of the target covering member, where the first set of samples includes a plurality of samples; The surface roughness characteristic parameter acquisition unit is used for performing bulging tests on a second set of samples and a third set of samples by utilizing the target bulging height to acquire target surface roughness characteristic parameters, wherein the target surface roughness characteristic parameters comprise second surface roughness characteristic parameters corresponding to the second set of samples and third surface roughness characteristic parameters of the third set of samples, and the second set of samples and the third set of samples are identical and comprise a plurality of samples with different surface morphologies; The hanging piece processing unit is used for carrying out coating hanging piece tests on the second set of samples and the third set of samples, wherein the hanging piece position is the position of the target covering piece in the coating hanging piece test process, the second set of samples sequentially complete pretreatment and electrophoresis treatment in the coating hanging piece processing process, and the third set of samples sequentially complete pretreatment, electrophoresis treatment and paint spraying treatment in the coating hanging piece processing process; The coating appearance detection unit is used for carrying out coating appearance detection on the second set of samples and the third set of samples after finishing coating hanging sheet test to obtain target detection results, wherein the target detection results comprise detection results of the second set of samples and detection results of the third set of samples; And the coupling relation acquisition unit is used for carrying out regression analysis processing by utilizing the target surface roughness characteristic parameter, the target detection result and the first surface roughness characteristic parameter of the first set of samples to obtain the coupling relation between the surface appearance of the automobile outer covering part and the coating appearance.
9. An electronic device comprising a memory and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors, where the one or more programs include instructions for performing the method according to any one of claims 1-7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out the steps corresponding to the method according to any one of claims 1-7.

Description

Method for obtaining coupling relation between surface morphology and coating appearance of automobile outer covering part Technical Field The invention relates to the technical field of automobile manufacturing processes, in particular to a method for acquiring a coupling relation between the surface appearance and the coating appearance of an automobile outer covering part. Background The automobile manufacturing process comprises four technological processes of stamping, welding, coating and final assembly. After the steel plate material is formed by stamping, the steel plate material enters a welding process, and enters a coating process after the welding process is finished, and the process flows of pretreatment, electrophoresis, paint spraying and the like are sequentially finished in the coating process. At present, with the development of automobile industry and economy, consumers have higher requirements on automobile safety and power performance, and have higher attention on the appearance of automobile coating. In the coating process, the appearance of an electrophoretic paint film and the appearance of a finish paint directly influence the appearance quality of the whole automobile coating, and the surface appearance of a stamped part has obvious influence on the coating appearance, so that a coupling relation between the surface appearance of an automobile outer covering part and the coating appearance is needed to be determined, the coating quality can be predicted according to the surface appearance of the covering part, and unqualified parts can be avoided and adjusted. Disclosure of Invention The embodiment of the invention provides a method for acquiring the coupling relation between the surface appearance of an automobile outer covering part and the coating appearance, which can acquire the coupling relation between the surface appearance of the automobile outer covering part and the coating appearance, so that the control precision of the coating quality can be improved by utilizing the coupling relation. An embodiment of the present invention provides a method for obtaining a coupling relationship between a surface topography of an automobile outer panel and a coating appearance, the method including: performing strain measurement grid printing processing on a first set of samples by using the shape of a target covering piece, and acquiring a target deformation amount of the first set of samples and a target bulging height corresponding to the target deformation amount when the shape of the first set of samples is changed into the shape of the target covering piece, wherein the first set of samples comprises a plurality of samples; Performing bulging tests on a second set of samples and a third set of samples by using the target bulging height to obtain target surface roughness characteristic parameters, wherein the target surface roughness characteristic parameters comprise a second surface roughness characteristic parameter corresponding to the second set of samples and a third surface roughness characteristic parameter of the third set of samples, and the second set of samples and the third set of samples are identical and comprise a plurality of samples with different surface morphologies; Coating hanging piece tests are carried out on the second set of samples and the third set of samples, wherein the hanging piece positions are the positions of the target covering pieces in the coating hanging piece test process, the second set of samples sequentially complete pretreatment and electrophoresis treatment in the coating hanging piece test process, and the third set of samples sequentially complete pretreatment, electrophoresis treatment and paint spraying treatment in the coating hanging piece test process; performing coating appearance detection on the second set of samples and the third set of samples after finishing the coating hanging piece test to obtain target detection results, wherein the target detection results comprise detection results of the second set of samples and detection results of the third set of samples; And carrying out regression analysis processing by utilizing the target surface roughness characteristic parameter, the target detection result and the first surface roughness characteristic parameter of the first set of samples to obtain the coupling relation between the surface appearance and the coating appearance of the automobile outer covering part. Optionally, the performing regression analysis processing by using the target surface roughness characteristic parameter, the target detection result and the first surface roughness characteristic parameter of the first set of samples to obtain a coupling relationship between the surface morphology and the coating appearance of the automobile outer covering part includes: If the detection result of the second set of samples comprises a target Ra value of the roughness of the electrophoretic paint film of the se