关节臂测量机的机械结构和空间误差补偿分析

Aralysis of System Structure and Error Compensation of Articulated arm Coordinate Measuring Machine

研究关节测量机优化测量精度问题,目前关节臂测量机在测量技术上还不成熟,对关节臂补偿目前尚难。关节臂测量误差补偿传统的方法是采用最小二乘法求解多个误差项目的最优解、求解角度、杆长、偏置、偏摆微分误差系数矩阵,在工程实践中这样做很难取得理想的效果。为解决上述问题,提出采用D-H方法设计关节臂坐标测量机的机械结构进行运动学建立模型并进行仿真,分析了各种运动学参数对关节臂测量精度的影响,并对误差进行分离处理,使得测量精度达到0.05mm以内。结果表明满足了关节臂设计的要求。

Presently,the technology is not mature at all,and the primary reason is the compensation for arm CMM.Traditional method for compensation uses LST to calculate the angle,pole length,and deflection error for differential coefficient matrix,and it is too difficult to be applied to the actual work.To improve the point,we use D-H method to analyze kinematic former of the joint arm CMM＇s machine structure,which can also simulatively analyze the infection of all the kinematics parameter and separately process the errors with the measure precision less than 0.05mm.The results show that the design meets the requirements of articulated arm.