照明工程学报

2021, v.32(02) 63-68

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基于平行背光源的含内棱孔型零件定位方法
Positioning Method of Hole with Inner Edge Based on Parallel Backlight

刘航铖;严小军;惠宏超;
LIU Hangcheng;YAN Xiaojun;HUI Hongchao;Beijing Institute of Aerospace Control Devices;

摘要(Abstract):

在轴孔零件装配中,机器视觉检测起到特征识别与空间定位的作用,使用平行背光源能提高机器视觉检测的精度。但在孔零件出现小角度倾斜时,平行背光源的工程应用存在困难。针对这一问题,通过识别孔零件的内棱轮廓并分析图像特征,在零件倾斜角小于1°时,可快速确定零件倾斜角度与空间位置,克服了平行背光源的工程应用难点。实验结果表明,改进后的定位方法误差优于0.5%,可实现零件倾斜角小于1°时,同轴度要求10μm的轴孔自动化装配,与采用环形光源的视觉定位方法相比,有效提升了孔零件小角度倾斜时的定位精度与装配成功率。
In the assembly of shaft hole parts, machine vision detection plays the role of feature recognition and spatial positioning. The use of parallel backlight can improve the accuracy of machine vision inspection. However, the engineering application of parallel backlight is difficult when the parts are inclined at a small angle. In order to solve this problem, by identifying the inner edge contour of hole parts and analyzing the image features, when the inclination angle of the part is less than 1°, the inclination angle and spatial position of the part can be quickly determined, which overcomes the engineering application difficulties of parallel backlight source. The experimental results show that the error of the improved positioning method is better than 0.5%. When the inclination angle of the parts is less than 1° and the coaxial degree is required to be 10 μm, the automatic assembly of the shaft hole can be realized. Compared with the visual positioning method using the ring light source, the positioning accuracy and assembly success rate of the shell parts with small angle tilt can be effectively improved.

关键词(KeyWords): 平行光源;机器视觉;轴孔装配
machine vision;ellipse fitting;shaft hole assembly;parallel light source;spatial positioning

Abstract:

Keywords:

基金项目(Foundation): 装备预研航天科技联合基金(项目编号:6141B061402)

作者(Authors): 刘航铖;严小军;惠宏超;
LIU Hangcheng;YAN Xiaojun;HUI Hongchao;Beijing Institute of Aerospace Control Devices;

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