Research on Error Motion Separation and Angle Optimization of Rotary Table
In order to solve the problem of multiple error coupling when measuring the error motion of rotary table,a method of error motion separation based on multi-point method was proposed.Firstly,by analyzing the motion characteristics of multi-de-gree-of-freedom errors in the rotary process of the rotary table,an end-four-point error separation method was proposed,which can complete the decoupling of tilt error and axial error while separating the flatness error on the lower surface of the measuring disk.Then,the error transfer function of the method was established,and the sparrow algorithm(SSA)was used for optimization to find the optimal arrangement angle that was minimally affected by harmonic suppression at different orders,which improved the error decoupling accuracy.Finally,the method was verified by means of simulation and experiment.The simulation results show that the separation accuracy(relative error)values of axial and tilt errors by the end four-point method are 1.934%and 9.177%,respec-tively.The experimental results show that the separated error motion is consistent with the calibration error of the rotary table,which verifies that the method can accurately obtain the error motion of the rotary table.
万方数据
维普
