Transactions of Materials and Heat Treatment

Title：Surface defect detection on stamping and grinding flat parts

Authors： Chen Qilin Wang Dongxing Lin Jiangang Tian Hongzhi

Unit： Yantai University

KeyWords： machine vision stamping grinding flat part defect light reflection

ClassificationCode：TH166

year,vol(issue):pagenumber：2020,45(6):168-174

Abstract：

In order to realize the application of machine vision in surface defect detection of stamping and grinding flat parts, the on-line inspection system was developed. After the grinding process, the grinding blade patterns on the surface of parts had the same direction and different depth.It was found that the clear whole area and the obvious outline of part under plane illumination were observed by experiment, but the subtle defects were difficult to find. Then, the directed light highlighted the subtle defects, but the blade pattern was reflective resulting in poor image quality. For the above situations, the lighting method combining plane light and directed light was designed to take advantage of their respective advantages. According to the characteristics of defect distribution, the part area was divided into internal and external parts to find the defects, and the image was processed by template matching, threshold segmentation and feature extraction. Furthermore, for the influence of blade pattern reflection, the method of finding defects based on edges was proposed, and it was determined whether the abnormality was caused by defect or by light reflection according to the positions and directions for the abnormal grayscale regions and the edges. The experiments show that the accuracy of this method is up to 97%.

Funds：

国家自然科学基金青年项目（11604285）

陈麒麟（1994-），男，硕士研究生 E-mail：501673549@qq.com 通讯作者：王东兴（1964-），男，博士，教授 E-mail：dxwang@ytu.edu.cn

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