Method, system and device for measuring fairing degree of automobile appearance curved surface and medium

Abstract

The invention provides a method, a system and a device for measuring the fairing degree of an automobile appearance curved surface and a medium, and the method comprises the steps: after a curved surface deformation region is confirmed, intercepting a cross section line of the curved surface deformation region, generating a plurality of feature points according to the cross section line, and calculating the two-dimensional coordinate of each feature point; generating a broken line graph according to the two-dimensional coordinates of all the feature points, and calculating a starting point, an ending point and a common tangent of the starting point and the ending point of the curved surface deformation area in the broken line graph; and calculating the maximum depth of the curved surface deformation area according to the two-dimensional coordinates of the feature points of the curved surface deformation area and the common tangent. According to the quantitative evaluation method for the depth / narrow side width of the bulge or the recess, the quantitative measurement result of the fairness of the CAD data of the mold surface or the CAD data of the automobile appearance part can be measured, and great convenience and universality are achieved.

Description

technical field [0001] The invention relates to the technical field of automobile inspection tools, in particular to a method, system, device and medium for measuring the degree of smoothness of automobile exterior curved surfaces. Background technique [0002] Parts with large area and small curvature, such as car roof and engine hood outer panel, are prone to collapse after stamping. In order to ensure the forming accuracy of such parts, the product surface needs to be raised during the stamping process. The 3D modeling of the surface involves the modification of the A-level surface modeling, and the modeling quality of the mold surface directly affects the appearance quality of the stamped product, so the 3D data of the mold surface needs to be tested for smoothness. [0003] In the prior art, CAITA or UG software is usually used for the smoothness detection of 3D data of mold surface modeling, and the 3D digital model of mold surface is imported into the software, and th...

AI Technical Summary

Problems solved by technology

[0004] However, using zebra pattern reflection analysis, when there are fine bumps or depressions in the unsmooth position, the image will be distorted after the specular reflection spot, but it cannot quantify the degree of unsmoothness of the surface shape, and it still depends on human sensory judgment; use the curvature comb function to analyze the surface Curvature continuity analysis, you can see the sudden change and turning point of the curvature, but it cannot intuitively express the degree of unsmoothness

Images