摘要
应用传统九线法进行精密数控机床误差补偿存在三点不足:首先,因激光测量与机床制造所采用的坐标系不一,在滚转角误差补偿过程中存在着原理性误差;其次,因九线法测量时纳入了测量噪声,将机床重复定位精度等也涵盖在内,导致辨识算法鲁棒性差;第三,九线法所得辨识结果只能用于误差补偿,而不能用于前期机床精度设计与机床装配与调试过程中精度的控制与工艺优化,原因在于该模型在设计时忽略了机床结构参数。以上3点限制了传统九线法的应用领域及测量结果的公信度。通过误差补偿模型重构、计算机仿真分析、实证对比研究、误差修正参数计算、实测结果校核等步骤,证明了建立的模型能修正传统九线法模型的3点不足,提高了九线法滚转角误差的辨识精度。
In the process of precision compensation of NC machine tools,the traditional 9-line method has such shortages： firstly,principle error is existed in error compensation of the rolling angle,because of difference from the coordinate system of the laser measurement and machine tool manufacturing; secondly,the method has a poor robustness because the measurement noise and the repeatability of the machine tool are included in the measurement; thirdly,the compensation model can only be used for the error compensation,and cannot be used for the precision design and the precision control and process optimization in the process of the machine tool assembly. 9-line method was modified based on error compensation model reconstruction,computer simulation research and empirical analysis. Compared with the experimental results,it is proved that the new method can correct three shortages of the traditional nine line method,and the accuracy of the roll angle error is improved.
出处
《机床与液压》
北大核心
2017年第14期40-43,63,共5页
Machine Tool & Hydraulics
基金
广州市教育科学"十二五"规划课题(11B112)
广东省"十二五"规划课题(2011TJK249)
广州市面上重点课题(1201522944)
关键词
修正九线法
误差辨识
模型重构
机床精度补偿
Modified 9-line method
Error identification
Model reconstructed
Precision compensation for machine tool
