Position geometric error modeling, identification and compensation for large 5-axis machining center prototype
Position geometric error modeling, identification and compensation for large 5-axis machining center prototype
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DOI：
10.1016/j.ijmachtools.2014.10.009
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发表时间：
2015-02
影响因子：
14
通讯作者：
Gaoyan Zhong;Chaoqun Wang;Shoufeng Yang;Enlai Zheng;Yanyan Ge
中科院分区：
文献类型：
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作者：
Gaoyan Zhong;Chaoqun Wang;Shoufeng Yang;Enlai Zheng;Yanyan Ge
提出了一种大型五轴联动加工中心样机的位置几何误差建模、辨识与补偿方法。首先，将样机视为刚体多体系统，建立了几何误差模型，利用激光干涉仪和激光跟踪仪分别对平移轴和旋转轴的位置几何误差进行了辨识。其次，在此模型的基础上，提出了一种改进的辨识方法-虚拟刚体法来计算各大平移轴的定位误差。给出了一个广义矩阵方程的详细推导过程。第三，采用基于最小二乘理论的解析模型，计算任意位置的误差值，进行误差补偿。最后，采用递推软件误差补偿方法对辨识出的位置几何误差进行补偿。结果表明，经过补偿后，大型加工中心样机的位置精度得到了提高，达到了设计要求。
This paper presents a position geometric error modeling, identification and compensation method for large 5-axis machining center prototype. First, regarding the prototype as a rigid multi-body system, a geometric error model has been established, which supports the identification of position geometric error associated with a translational axis by using laser interferometer, and a rotational axis by using laser tracker. Second, based on this model, an improved identification approach named as virtual rigid-body is put forward for calculating positioning error of each large translational axis. Detailed derivation of a generalized matrix equation is given. Third, analytical models based on the least-squares theory were adopted to compute error values at an arbitrary position for error compensation. Finally, the identified position geometric errors were compensated by using recursive software-based error compensation method. The results show that the position accuracy of large machining center prototype has been improved with compensation and up to the design requirements.