数控机床旋转轴误差的快速测量与辨识新方法

根据齐次变换理论推导出旋转轴基本几何误差辨识模型,在此基础上,提出了一种基于球杆仪的旋转轴基本几何误差快速测量和辨识新方法,将球杆仪一端的中心座分别安装在旋转工作台的3个不同位置,通过联动控制球杆仪另一端球心按圆形轨迹运动,分别测量旋转轴圆周每个离散位置点在X、Y、Z方向上的偏差,并根据所建立的辨识模型,辨识出旋转轴的6项基本几何误差。同时,提出了基于系数矩阵灵敏度分析的方法,用于指导测量点的合理分布,减少测量误差的影响,从而提高误差辨识精度。

Research on New Fast Measurement Method and Identification of Rotation Axis Movement Errors for CNC Machine

An identification model of rotation axis basic geometric errors was derived based on the theory of homogeneous transformation, and then a new fast measurement method and identification of rotation axis basic geometric errors based on ball-bar were proposed herein. The measurement of ball-bar was adopted by one end of the ball-bar was fixed on the rotary table in three different positions respectively. By the linkage control the other end of the ball-bar in circular trajectory, the deviations of each position measurement point in the directions of X, Y and Z could be measured in each discrete position. And then the rotation axis six basic geometric errors could be identified according to the established identification model. As to guide the distribution of the measuring points and reduce the influence of measurement error, a method based on sensitivity analysis of the coefficient matrix was presented and the accuracy of error identification is improved.