Accurate identification and compensation of geometric errors of 5-axis CNC machine tools using double ball bar
Accurate identification and compensation of geometric errors of 5-axis CNC machine tools using double ball bar
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DOI：
10.1088/0957-0233/27/5/055004
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发表时间：
2016-03
影响因子：
2.4
通讯作者：
Ali Lasemi;D. Xue;P. Gu
中科院分区：
文献类型：
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作者：
Ali Lasemi;D. Xue;P. Gu
五轴联动数控机床广泛应用于自由曲面零件的加工。机床的几何误差对零件的加工质量有着重要的影响。本研究旨在发展一种新的方法，以准确地识别五轴数控机床的几何误差，特别是旋转轴的误差，使用磁性双球杆。为几何误差的识别提供了理论模型。在该模型中，位置无关误差和位置相关误差都被认为是误差源。该模型通过识别和去除机器的相关和不重要的误差源来简化。使用敏感性分析技术识别不显著的误差源。仿真结果表明，简化后的误差辨识模型能更准确地估计出误差参数。在五轴数控机床上的实验也表明，误差补偿后的体积误差显着减少。
Five-axis CNC machine tools are widely used in manufacturing of parts with free-form surfaces. Geometric errors of machine tools have significant effects on the quality of manufactured parts. This research focuses on development of a new method to accurately identify geometric errors of 5-axis CNC machines, especially the errors due to rotary axes, using the magnetic double ball bar. A theoretical model for identification of geometric errors is provided. In this model, both position-independent errors and position-dependent errors are considered as the error sources. This model is simplified by identification and removal of the correlated and insignificant error sources of the machine. Insignificant error sources are identified using the sensitivity analysis technique. Simulation results reveal that the simplified error identification model can result in more accurate estimations of the error parameters. Experiments on a 5-axis CNC machine tool also demonstrate significant reduction in the volumetric error after error compensation.