Cylindrical coordinate measuring machines: probe offset and workpiece clamping error

QIU Zu-rong, WANG Cheng-lin, SU Zhi-kun, LI Hao-peng, XUE Jie, LI Xing-hua, LU Yao-huan

（State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China）

Abstract： A cylindrical coordinate measuring machine for the detection of large-size rotational parts is introduced. The measuring machine can simultaneously measure the geometrical dimensions, form and position errors of the inner and outer surfaces. Since the maximum length of the workpiece can reach 2 000 mm, it is difficult to be clamped and adjusted and easy to produce clamping error. The eccentricity can be up to 1.5 mm, which has an interaction effect with the probe mounting offset. We mainly study the probe offset of the measuring machine and the influence of the workpiece clamping error on the measurement. A method of controlling the offset of the measuring probe is proposed. The effect of the clamping error is eliminated through the space coordinate transformation of the workpiece axis, and the axis is fitted by the least square method. Finally, a common fixture can be realized to meet the clamping requirements of the workpiece.

Key words： rotational parts; probe offset; eccentricity; cylindrical coordinate measuring machine

CLD number： TH721.3 Document code： A

Article ID： 1674-8042（2019）03-0205-08  doi： 103969/j.issn1674-80422019-03-001

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圆柱坐标测量机：测头偏置和工件装夹误差

裘祖荣， 王成林， 苏智琨， 李浩鹏， 薛洁， 李杏华， 路遥环

（天津大学 精密测试技术及仪器国家重点实验室， 天津 300072）

摘要：介绍了一种圆柱坐标测量机用于大尺寸回转体工件的检测方法， 该测量机可同时实现工件内外表面几何尺寸、 形位误差的测量。 工件最大长度可达2 000 mm， 针对大尺寸回转体工件难以装夹调节， 易产生装夹误差， 最大偏心量可达1.5 mm， 并与测头安装偏置产生交互影响， 提出了一种控制测头偏置量的方法， 并通过最小二乘法拟合工件轴线， 对轴线进行空间坐标变换， 消除工件装卡误差对测量的影响， 实现了普通卡盘即可满足工件的装卡要求。

 
 
关键词：回转体工件； 测头偏置； 偏心； 圆柱坐标测量机

引用格式：QIU Zu-rong, WANG Cheng-lin, SU Zhi-kun, et al. Cylindrical coordinate measuring machines: probe offset and workpiece clamping error. Journal of Measurement Science and Instrumentation, 2019, 10（3）： 205-212. ［doi： 103969／jissn1674-8042201903001］

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