Calibration of a small size hexapod machine tool using coordinate measuring machine
Calibration of a small size hexapod machine tool using coordinate measuring machine
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DOI：
10.1177/0954408914544203
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Guoqing Zhang;Jianjun Du;S. To
中科院分区：
文献类型：
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作者：
Guoqing Zhang;Jianjun Du;S. To
六足机床(HMT)是一种专为微细加工而设计的机床，但由于加工和装配误差导致的运动参数偏差，必然会影响其运行精度。为了识别真实的运动学参数，以提高机床的运行精度，在桥式坐标测量机上进行了一种新颖的标定试验。建立了姿态误差与运动参数误差之间的数学模型，设计了基于三坐标测量机的测量方法，并进行了标定实验。实验结果表明，标定后HMT的位置误差和姿态误差均显著减小，对称性误差也有所改善。此外，还发现HMT的运行精度与运行方向有关，这与HTM的结构有关。本研究为研究人员提供了一种新的有效的标定方法，以提高HMTS的运行精度。
Hexapod machine tool (HMT) is a device designed for micro milling; however, the deviations of the HMT’s kinematic parameters due to manufacture and assembly errors can definitely affect its running accuracy. To identify the real kinematic parameters so as to improve the running accuracy of the HMT, a novel calibration test was performed on a bridge-type coordinate measuring machine. In the present research, a mathematical model was derived to present the relationship between pose errors and the errors of kinematic parameters of the HMT, the measurement method based on coordinate measuring machine was designed and a calibration experiment was carried out subsequently. The experimental results reveal that after calibration, both the position errors and orientation errors of the HMT decreased significantly, the symmetrical errors were improved as well. In addition, it is found that the running accuracy of the HMT is running direction dependent, which depends on the HTM’s structures. The present research provides researchers with a new and effective calibration method to improve the running accuracy of HMTs.