表检系统在冷轧板表面线性缺陷检测中的应用

保护渣缺陷、气泡缺陷、夹杂物缺陷和擦划伤缺陷是冷轧薄板表面典型的 4 种线性缺陷,由于此 4 种线性缺陷宏观形貌相似,优化前的表检系统难以对其进行准确区分,给线性缺陷的判定、溯源及工艺改进造成了极大的困难。通过大量取样分析,并对各线性缺陷的表检结果和实物形貌以及微观特征进行了对比,明确了各线性缺陷的宏观和微观形貌特征,并以此为依据优化了线性缺陷表检系统的判定规则和图库,使冷轧薄板表面线性缺陷判定的准确率由80%提高至90%。

Application of surface inspection system in detection of linear defects on cold-rolled sheets

Mold flux defect, bubble defect, inclusion defect and cold rolling scratches are the four typical linear defects on the surface of cold-rolled sheets. Due to the similarity of the macroscopic morphology for these four defects, it is difficult to accurately distinguish them by surface inspection system, which causes difficulty in the judgment, traceability and process improvement. The surface inspection results, physical morphologies and microscopic characteristics of each linear defect were compared through large numbers of sampling analysis, and the macroscopic and microscopic characteristics of every kind of linear defect were clarified. Based on this, the judgment rules and the defect library of the surface inspection system are optimized, thus the accuracy rate of defect judgment is improved from 80% to 90%.