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首页> 外文期刊>International Journal of Machine Tools & Manufacture: Design, research and application >Error calibration of controlled rotary pairs in five-axis machining centers based on the mechanism model and kinematic invariants
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Error calibration of controlled rotary pairs in five-axis machining centers based on the mechanism model and kinematic invariants

机译：基于机制模型和运动不变的五轴加工中心控制旋转对的误差校准

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摘要

The mechanism model of ball bar testing for a two-axis rotary table of 5-axis machining center is discussed, and a new ball bar method to measure the three-dimensional motions of the rotary pairs in multi-axis machining center is developed based on the mechanism model. Then, the fixed axes and moving axes of the rotary pairs are identified by using spherical image circle fitting and striction circle fitting, according to the kinematic invariants of nominal rotation and the measured motions. The structure errors and kinematic pair errors of the rotary pairs are defined and identified by using the fixed and moving axes, and the kinematic model of the two-axis rotary table is deduced with those errors. The simultaneous two-axis motions of the rotary table are measured to verify the proposed calibration method. The experimental results show good agreements with the predicted results calculated by the calibrated kinematic model. Furthermore, the accuracy of the simultaneous multi-axis motions of the machining center is improved when the identified errors are corrected.
机译：讨论了用于5轴加工中心的双轴旋转台的球杆测试的机制模型，并且基于以下开发了一种新的球杆方法来测量多轴加工中心旋转对的三维运动的方法机制模型。然后，根据标称旋转和测量运动的运动不变，通过使用球形图像圆装配和划线圈配件来识别旋转对的固定轴和移动轴。通过使用固定和移动轴定义和识别旋转对的结构误差和运动对误差，并且通过这些误差推导出双轴旋转台的运动模型。测量旋转台的同时两轴运动以验证所提出的校准方法。实验结果表明，与校准运动模型计算的预测结果显示出良好的协议。此外，当校正识别的误差时，改善了加工中心的同时多轴运动的精度。

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