球杆仪安装误差对机床圆测试精度的影响

为了提高球杆仪测量机床误差的准确度,研究了其安装误差对机床圆测试数据的影响及辨识和分离方法.通过分析球杆仪测量过程中某任意位置的几何特征,推导了球杆仪测量值与安装误差间的数学关系.继而利用数学仿真揭示了测量值随安装误差变化的规律,并建立了相应的数学模型.在此基础上,提出了一种对安装误差进行辨识和分离的新方法.仿真实验数据证明,该安装误差辨识方法具有较高的辨识精度.最后,对非接触激光圆进行了测试实验,结果表明,所提出的方法可以有效地辨识和分离球杆仪安装误差,提高了球杆仪圆测试数据的准确度.

Effects of Double Ball Bar Setup Errors on Accuracy of Circular Tests of Machine Tools

Abstract： To improve the circular test accuracy of double ball bar (DBB), the mechanism of DBB setup errors was studied and an identification and separation model was proposed. In the first place, based on the analysis of the geometric relationship of an arbitrary position in the process of measurement, the mathematical relationship between DBB measurement and setup errors was established. The distortion rule of measured values along with setup errors was obtained in mathematical simulation, and a new identification and separation method of setup errors was put forward. The simulation results prove that the proposed method can identify setup errors with high accuracy. The noncontact laser measurement results show that the proposed method can effectively identify DBB setup errors and significantly improve the accuracy of circular tests.