Method and device for detecting defects on the outer surface of a cylindrical workpiece

Abstract

The embodiment of the present invention discloses a method and device for detecting defects on the outer surface of a cylindrical workpiece, which is used to rotate the cylindrical workpiece and simultaneously use an area array camera to take pictures of the outer surface of the cylindrical workpiece, and synthesize several photos taken into a 360-degree Image, and then analyze the defect, which solves the problem that the existing line-scan camera combined with the strip light source detection method for defects such as relatively shallow smooth transition pits and defects perpendicular to the direction of the light strip, existing workpieces in the process of rotating and taking pictures Changes in the position of the camera will seriously affect the photographing effect and cause technical problems such as inaccurate detection results.

Description

technical field [0001] The invention relates to the field of workpiece detection, in particular to a method and device for detecting defects on the outer surface of a cylindrical workpiece. Background technique [0002] There are many cylindrical workpieces in industrial products, such as shafts, copper sleeves, cylinder liners, bullet casings, etc. It is necessary to inspect their appearance to detect various processing defects, such as pits, cracks, cracks, scratches, deformation, etc. . [0003] The existing inspection method for cylindrical workpieces is to use a strip light source to irradiate the surface of cylindrical workpieces, and then use a line-scan camera to take pictures while rotating the workpieces. However, for some defects such as relatively shallow pits with smooth transitions and In the detection of directional defects, the position change of the workpiece during the rotation and photographing process will seriously affect the photographing effect, resul...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method and device for detecting defects on the outer surface of a cylindrical workpiece, which is used to rotate the cylindrical workpiece and simultaneously use an area array camera to take pictures of the outer surface of the cylindrical workpiece, and synthesize several photos taken into a 360-degree Image, and then analyze the defect, which solves the problem that the existing line-scan camera combined with the strip light source detection method for defects such as relatively shallow smooth transition pits and defects perpendicular to the direction of the light strip, the existing workpieces are in the process of rotating and taking pictures The position change will seriously affect the photo effect and cause the technical problem of inaccurate detection results.

Images