基于机器视觉铸件布氏硬度在线检测技术研究*
网络出版日期: 2017-01-05
基金资助
* 国家杰出青年科学基金资助项目(51525503); 20160613收到初稿,20161014收到修改稿;
On Line Detection Technology of the Hardness of Cast Iron Parts Based onMachine Vision
Online published: 2017-01-05
为实现铸件布氏硬度的在线检测,应用基于机器视觉的布氏硬度自动测量系统采集压痕图像,研究压痕图像滤波、压痕图像轮廓直径提取、直径标定系数等算法。根据压痕图像的特点,提出基于粒子群的Snake模型压痕轮廓提取算法。引入压痕直径标定系数,解决了视觉测量中的压痕直径像素与压痕物理直径的换算关系,并对直径标定系数进行最小二乘法拟合,提高了测量精度。应用布氏硬度在线测量装置对 180~210 HBW 标准硬度块进行试验测试。试验表明:测量平均误差为 0.72%,测量精度在±2 HBW之间,测量标准差为125 HBW,装置重复性好,精度高,完全能够满足铸件的布氏硬度在线检测要求。
单忠德 , 张飞 , 任永新 , 张静 , 聂军刚 . 基于机器视觉铸件布氏硬度在线检测技术研究*[J]. 机械工程学报, 2017 , 53(1) : 157 -164 . DOI: 10.3901/JME.2017.01.157
Key words: Brinell hardness; machine vision; image processing; error analysis
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