基于线激光传感器的外螺纹参数在线测量系统  

An Online Measurement System for External Thread Parameters Based on Two Linear Laser Sensors

作　　者：郭斯宜 崔剑秋 位恒政[1] 裴丽梅[1] 向思思 任国营[1] GUO Siyi;CUI Jianqiu;WEI Hengzheng;PEI Limei;XIANG Sisi;REN Guoying(National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2025年第1期17-24,共8页Metrology Science and Technology

基　　金：国家市场监督管理总局科技计划项目(2022MK178);中国计量科学研究院基本科研业务费项目(AKYZZ2204-24)。

摘　　要：针对外螺纹参数高精度快速测量的需求,提出一种基于对径双线激光传感器的测量方案。通过眼在手外(Eye To Hand)标定建立CCD相机与机械臂的空间转换矩阵,实现通过图像引导机械臂带动测量单元运动。通过控制机械臂的位姿及实时反馈的线激光数据,实现光面量规的标定。两线激光传感器采集螺纹轮廓数据,利用最小二乘法拟合大小径轮廓,迭代寻找螺纹中径线,计算得到外螺纹中径、大径、小径和螺距参数。通过分析本测量系统误差来源,计算得到螺纹中径测量扩展不确定度U=6.3μm。比对实验结果表明,该测量系统可实现外螺纹参数高精度、高速测量。To better meet the demand for high-precision and rapid measurement of external thread parameters,an online measurement system based on two linear laser sensors is proposed.Through eye-to-hand calibration to establish the spatial transform matrix between the CCD camera and the robotic arm,the motion of the measurement unit driven by an imageguided robotic arm is achieved.The calibration of the flat plug gauge is realized by controlling the pose of the robotic arm and the real-time feedback from the linear laser sensors'data.The linear laser sensors collect the thread profile data,fit the major and minor diameter profiles using the least squares method,iteratively determine the pitch diameter line,and calculate the external parameters of major diameter,minor diameter,pitch diameter,and pitch.By analyzing the sources of error in the measurement system,the expanded uncertainty of the pitch diameter measurement is calculated to be U=6.3μm.Comparative experimental results indicate that this measurement system can achieve high-precision and high-speed measurement of external thread parameters.

关 键 词：计量学 螺纹测量 线激光传感器 手眼标定 机械臂 转换矩阵 

分 类 号：TB921[一般工业技术—计量学]