Method for detecting surface defects of intaglio roller by using 3D photographing technology

Abstract

The invention discloses a method for detecting surface defects of an intaglio roller by using a 3D photographing technology. In the manufacturing process of the intaglio roller, a steel body is platedwith copper, and is ground to enable a copper surface to be bright and smooth, and pit defects are generated on the surface of a ground copper layer due to the defects of the steel body or the defects generated in the electroplating process, in the gravure printing industry, the defects are called as copper points, namely the surface defects of the printing roller, and the defects have an obviouscharacteristic that all the defects are in a concave state, so that the copper point can be accurately found as long as whether the defect is concave or not can be judged. According to the invention,the problem of missing inspection caused by visual fatigue of manual inspection is solved, the problem of over-inspection caused by non-real defect interference of dust, water spots and the like during traditional industrial visual inspection is also solved, the accuracy of defect detection can be ensured on the premise of ensuring the detection efficiency, missing inspection and over-inspectionare avoided, and the inspection quality of a gravure plate roller after grinding is greatly improved.

Description

technical field [0001] The invention relates to a high-reliability, high-resolution defect detection and identification method for the surface defect detection of the core component plate roller in the printing industry. Method for detecting surface defects of gravure plate rolls. Background technique [0002] The plate roller in the gravure printing industry is the key core component that affects the printing quality. The smoothness of the surface of the component and the clarity of the printing lines directly affect the quality of gravure printing and the quality of printed products. [0003] There are generally three steps in the surface treatment of gravure printing plate rollers, the surface treatment of the billet body, the surface treatment after copper plating and grinding, and the surface treatment of the finished product after chrome plating of the plate gauge. Defects are repaired or repaired. Especially in the copper plating grinding surface treatment process, ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the existing defects and provide a detection method for the surface defects of the gravure plate roller by using 3D photographing technology. The surface of the roller is wiped to remove interference such as dust spots and sundries on the surface; when the same position is illuminated by four groups of light sources separately, the images of the detection surface under different illumination angles are taken; through the analysis of 5 images of the detection surface processing to synthesize the radial depth image of the abnormal point on the shooting surface; through the analysis of the depth image of the abnormal point, it is accurately judged whether the abnormal point is a copper point defect point or an interference point; by marking the component, the position judged to be a copper point defect is Mark with a marker pen and record the position of the defect point in the system

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