Detection method for surface defects of engine cam shaft part

Abstract

The invention discloses a detection method for surface defects of an engine cam shaft part. The detection method comprises a detecting algorithm for ring surface defects of upper and lower end surfaces, an algorithm for detecting whether a thread exists at the bottom or not, and an algorithm for detecting whether scrap iron is remained in a bottom hole or not, wherein the detecting algorithm for the ring surface defects of the upper and lower end surfaces adopts a possibility Hough conversion method combining with gradient information to carry out circle center positioning on the upper and lower end surfaces; central circular holes are removed; then images of the ring surface of the upper and lower end surfaces are pre-treated by adopting homomorphic filtering and image noises are removed by using opening operation; defect regions are clustered and defect types are judged. According to the detection method, a coaxial light source, an annular light source, a point light source and an area-array camera are used for carrying out polishing and image acquisition on the end surface of the part and the bottom hole. A dividing device and a photoelectric switch are used for controlling an intermittent rotary mechanical structure of a circular disc, so that the automatic detection, with the resolution rate better than 0.1mm and the single piece detection time less than three seconds, on surface cracks, scratches and spots on the surface of a workpiece, and on whether the scrap iron is remained in the thread of the bottom hole of the part and in the hole or not can be realized.

Description

technical field [0001] The invention belongs to the field of mechanical parts detection, and in particular relates to a method for detecting surface defects of engine camshaft parts. Background technique [0002] The camshaft is the part in a piston engine that controls the opening and closing of the valves. The law of valve movement is related to the power and operating characteristics of an engine, so the camshaft plays a very important role in the engine. During the production and processing of camshaft parts, problems such as missed processing, bumps, black skin, and rust spots may occur. In order to ensure the quality of the camshaft, it is necessary to ensure that the parts that leave the factory must be qualified. At present, most domestic enterprises still use the method of manual visual inspection for the surface defects of small workpieces produced in large quantities. Manual visual inspection is easily affected by physiological and psychological factors, resulti...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for detecting surface defects of engine camshaft parts, which solves the problems of low efficiency of manual visual inspection, easy missed detection, wrong detection, etc.

Images