Automatic Inspection of Space Clearances between Welding Gun Head and Sheet Metal Parts

doi:10.3969/j.issn.1004-132X.2021.21.009

Abstract

Abstract: In order to solve the problems such as complicated inspection processes and inaccurate inspection results of space clearances of welding gun head and sheet metal parts near welding spot in 3D model of car body, an automatic inspection method for space clearances of welding gun head and sheet metal parts was proposed. Based on the feature recognition algorithm and bounding box technology, the analysis elements such as welding spot features, sheet metal features and nut features were obtained. Based on the projection algorithm and distance measurement algorithm of 3D model, the distance between topological surface of sheet metal parts and virtual welding gun was calculated. After compared with safety threshold, dangerous planes, holes and nuts that interfered with welding gun were screened out. The welding spots with insufficient welding space were marked and taken screenshot. The above algorithm was realized by using the function library provided by the secondary development environment. The feasibility of the automatic inspection system was verified by running examples and the actual uses of enterprises.

Key words: welding gun, sheet metal parts, welding spot, space clearance

摘要： 针对车身三维模型中焊枪头与焊点附近的钣金件之间空间间隙检查过程复杂、检查结果不准确等问题，提出了焊枪头与钣金件空间间隙的自动检查方法。在特征识别算法和包围盒技术的基础上获得焊点特征、钣金件特征和螺母特征等分析要素；基于三维模型的投影算法和距离测量算法计算钣金件的拓扑面与虚拟焊枪之间的距离，与安全阈值比较，筛选出与焊枪发生干涉的危险平面、孔和螺母；对焊接空间不足的焊点进行标注并截图。利用二次开发环境所提供的函数库编程实现了上述算法，通过运行实例以及企业的实际使用，验证了自动检查系统的可行性。

关键词: 焊枪, 钣金件, 焊点, 空间间隙

CLC Number:

TP391.7

DONG Yude, WU Wenzhe, CHEN Jian, WU Haijiang, ZOU Wenjun. Automatic Inspection of Space Clearances between Welding Gun Head and Sheet Metal Parts[J]. China Mechanical Engineering, 2021, 32(21): 2598-2605.

董玉德, 吴文哲, 陈健, 吴海江, 邹文俊. 焊枪头与钣金件空间间隙的自动检查[J]. 中国机械工程, 2021, 32(21): 2598-2605.

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