Spot facing quality detecting method based on linear laser three-dimensional scanning

Abstract

The invention provides a spot facing quality detecting method based on linear laser three-dimensional scanning. The method comprises the following steps: S1, acquiring three-dimensional point cloud data and plane grayscale images of spot facing and an upper surface of the periphery of the spot facing by using a linear laser three-dimensional scanner; S2, processing the acquired three-dimensional point cloud data by using a point cloud database, to obtain a plane parameter equation fitting the upper surface, a vertex coordinate fitting a circular conical surface, a direction vector of an axis,and a taper angle; S3, calculating normal perpendicularity of the spot facing; S4, distinguishing a black part in the plane grayscale image by using a computer vision database, to obtain an inner diameter D of the spot facing; and S5, acquiring a distance H' from a lower circular surface formed by a lower annular edge fitting the circular conical surface to a fitting upper surface. The method is capable of, based on comprehensive application of the linear laser three-dimensional scanner, the point cloud database and the computer vision database, and through the steps S1-S5, rapidly and accurately acquiring related parameters of the spot facing, thereby improving detection efficiency and detection precision.

Description

technical field [0001] The invention relates to the technical field of industrial automation, in particular to a method for detecting the quality of a countersink based on three-dimensional scanning of a line laser. Background technique [0002] At present, since the aircraft frame and skin are generally connected by riveting or high-lock bolts, a certain number of holes need to be set on the surface of the aircraft, and the machining accuracy of the holes directly affects the structural performance of the aircraft. For example, when the holes are perpendicular to the aircraft surface When the degree deviation is too large, additional stress will be generated at the position of the hole, thereby reducing the connection strength of the structure and seriously affecting the life of the aircraft. Therefore, accurate and efficient hole quality inspection technology is the key link to improve the hole making process and ensure the structural performance of the aircraft. [0003]...

AI Technical Summary

Problems solved by technology

There are several problems in the use of these special instruments (such as gauges): First, most instruments can only detect a few parameters, and it is difficult to obtain complete evaluation parameters through one measurement or one instrument, so the efficiency of hole quality detection is low The second is that some parameters are difficult to measure through contact instruments, such as the countersink cone angle and other parameter indicators cannot be detected; the third is that contact measurement is easy to damage the workpiece; the fourth is that the manual hand-held instrument detection workload is too large, It is impossible to carry out accurate measurement for each hole, only random inspection can be realized, so there are certain hidden dangers

Images