凸轮恒磨除率磨削的转速曲线优化

Speed Curve Optimization of Constant Removal Rate of Cam

凸轮是复杂的非圆零件,加工过程中,瞬时速度和加速度剧烈变化会降低加工品质。推导了恒磨除率变速磨削数学模型。基于恒力磨削的思想,得到了凸轮C轴变速恒磨除率公式。在此基础上,运用最小二乘法对凸轮轮廓数据进行多项式拟合,得到平滑的凸轮转速曲线和砂轮进给速度曲线。仿真结果表明,该方法能够使磨除率保持近似恒定的同时,还得到平滑的旋转轴转速曲线,并大幅减小C轴的加速度,从而提高凸轮轴磨削精度。

Cam is a non-circular parts. The dramatic change of instantaneous speed reduces the processing quality. This paper de- duces variable speed grinding mathematical model, based on the constant grinding rate. The variable-speed grinding removed con- stant rate formula of the cam C shaft is obtained based on the idea of constant force grinding. On this basis, it uses the least square method to do the polynomial fitting of the cam profile data and get the speed curves of smooth cam operation and grinding wheel feeding. The simulation results show that the method can be used to make the grinding rate approximately constant and get the smooth rotation speed curve, and the C axis acceleration is reduced greayly, thus improving the cam grinding precision.