针对生产现场中工件精确测量和寻位问题,基于计算机数字控制机床(CNC)平台和线激光搭建了一套在机测量系统,并对工件一面两孔特征的快速寻位方法进行研究。利用球面的各向同性,通过标准球实现线激光在机测量系统的全局标定。将平面和孔作为找正特征,基于线激光传感器获取的测量数据,设计拟合算法并对相关特征的尺寸位置信息进行计算,最后利用试验件进行快速寻位实验。实验结果表明,该在机测量系统具有较高的精度和稳定性,能够满足生产加工中的工件寻位找正要求。

This article focuses on the research of fast-positioning method of one-plane two-hole feature, while aiming at the precise measurement and positioning of workpieces at a production site, and it builds a set of on-machine measurement system based on the computer numerical control (CNC) platform and line laser. Using the isotropy of the spherical surface, global calibration of the line laser on-machine measurement system is achieved through a standard sphere. The plane and holes are used as the positioning features. Based on the measurement data obtained by the line laser sensor, a fitting algorithm is designed and the size and position information of the relevant features are calculated. Finally, a test piece is used for the fast positioning test. The test results exhibit that the on-machine measurement system can meet the requirements of workpiece positioning and alignment in production and processing, and the system also possesses high accuracy and stability.