REVO测头在非正交式三坐标测量机中的探测矢量修正算法

Correction of Detecting Vector of REVO Applied in Non-Orthogonal Coordinate Measuring Machine

REVO测头是基于正交式三坐标测量机设计和应用的,针对在非正交悬臂式整体叶盘原位测量机下应用REVO测头探测姿态不正确的问题,根据悬臂式测量机的结构特点,提出了一种探测矢量修正算法,通过将控制器返回的数据进行分离,并经过建立的旋转臂与测头之间的准刚体模型变换,得到REVO测头探测矢量与机器坐标系下被测工件表面法矢的关系,达到探测矢量修正的目的.实验结果表明:探测矢量经过修正后,测量30,mm长的量块,平均误差值从0.015,6,mm降低到0.003,7,mm,提高了测量机的测量精度,为REVO测头在非正交式三坐标测量机中的应用和深入研究奠定了坚实的基础.

REVO is designed and applied based on the orthogonal coordinate measuring machine(CMM).A correction algorithm of detecting vector of REVO was proposed according to the application of REVO to the non-orthogonal cantilever CMM(CCMM) for the blisk in-situ measurement.On the basis of separation of the data returned by the controller,the relationship between the detecting vector of REVO and the normal vector of the measured surface of workpiece was obtained via the translation of the pseudo-rigid model between rotary arm and REVO,and the correction of the detecting vector was then achieved.Experiments were carried out on measuring the block of 30,mm,and the measurement precision was improved a lot as the average error decreased from 0.015,6,mm to 0.003,7,mm.The research lays a solid foundation for the application and further research of REVO on the non-orthogonal CMM.