Car body feature line disappearance position detection method

Abstract

The invention discloses a car body feature line disappearance position detection method. The method comprises the following steps of obtaining point cloud data of the surface of a part, wherein the part contains a to-be-detected feature line; performing gridding processing on the obtained point cloud data; calculating a cross section curvature of the part according to a predetermined interval along the feature line; and according to a change of the cross section curvature, determining a disappearance position of the feature line. According to the car body feature line disappearance position detection method, the disappearance position of the feature line is searched for by utilizing the change of the multi-cross section curvature with the aid of an optical scanning technology and computeraided processing; and compared with conventional artificial visual measurement, accurate quantitative measurement is realized, and higher measurement efficiency is achieved.

Description

technical field [0001] The invention relates to the field of automobile manufacturing, more specifically, to a detection method in the automobile manufacturing process. Background technique [0002] With the aesthetic changes of the appearance of automobiles and the improvement of the stamping process, the characteristic lines of the car body (also known as ribs or waistlines) have become an indispensable feature of the exterior design of automobiles. On the body, there are many characteristic lines that do not completely run through the entire body or parts, but present a state of gradually disappearing. Typical is the characteristic line on the front cover of the car. figure 2 Reveals example styling of the character line on the car's bonnet. figure 2 It is a schematic diagram of the car front cover and characteristic lines modeled by computer. The character line on the bonnet of the car runs along the bonnet but gradually fades and disappears. In the process of proces...

AI Technical Summary

Problems solved by technology

Among them, the disappearance position of the black circle B on the right is higher than the disappearance position of the black circle A on the left, or the feature line on the right is shorter and the feature line on the left is longer, resulting in visual asymmetry

[0003] Since the disappearance of the characteristic line is a gradual process, it is a slow transition state, not a "broken" state, and the shape of parts such as the front cover is mostly arc-shaped, which makes it difficult to determine the specific disappearance of the characteristic line. location poses great difficulties

[0004] In the existing technology, manual measurement is generally used to judge the disappearance position of the characteristic line, but manual measurement has a large workload, low precision and low measurement efficiency

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