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针对五轴数控加工中主轴头中心角速度超限和非线性误差的问题,提出了基于旋转轴线性插补的RTCP算法,分析了插补过程中的全局干涉现象,推导了刀杆偏差系数公式,得到了RTCP模式下的无碰干涉区域,避免了干涉现象的发生。算法减小了非线性误差,保证了插补过程中机床旋转轴的运动平稳性,当刀具长度变化时无需重新通过后置处理生成数控程序,提高了加工效率。仿真结果证实了算法的可行性。
In order to solve the problem of oversized and non-linear angular velocity of spindle head in five-axis CNC machining, an RTCP algorithm based on linear interpolation of rotating axes was proposed. The global interference phenomenon during interpolation was analyzed, The non-touch interference region under RTCP mode is obtained, which avoids the interference phenomenon. The algorithm reduces the nonlinear error and ensures the motion smoothness of the rotating shaft of the machine tool during the interpolation. When the length of the tool changes, the NC program does not need to be re-processed by the post-processing and the processing efficiency is improved. Simulation results confirm the feasibility of the algorithm.