【摘要】 为提高连续曲面周铣过程中铣削力的预测精度和计算效率,采用参数化曲面描述工件轮廓和刀具路径,研究实际径向切深的计算方法,推导解析算式,给出基于实际径向切深的瞬时切入角、切出角计算公式,从而构建了瞬时铣削力模型,提出了基于实际径向切深的铣削力预测方法.采用仿真法证明了曲率对实际径向切深具有显著影响,加工凹曲面时实际径向切深大于名义径向切深,加工凸曲面时实际径向切深小于名义径向切深.对连续曲面周铣铣削力进行预测,并进行试验验证,预测结果与试验结果在变化趋势和幅值方面均具有良好的一致性,仿真耗时显著减小,表明提出的铣削力预测方法具有较高的精度和计算效率.更多还原

【Abstract】 In order to improve the prediction accuracy and calculation efficiency of milling force in continuous curved surface milling proces, this paper examines the workpiece contour and tool path through parametric curved surface. A new method is proposed to calculate actual radial cutting depth, and calculation equations are derived. Based on actual radial cutting depth, the entry and exit angles are calculated. And then, a model for instantaneous milling force is established. Also, a new milling force prediction method based on actual radial cutting depth is proposed. Simulations indicate that curvature has a significant effect on the actual radial cutting depth. When concave surface is machined, the actual radial depth is greater than the nominal radial depth, and the actual radial depth is less than nominal radial depth when convex surface is machined. Moreover, this paper predicts the milling force in peripheral milling of complex curved surface and conducts tests for validation. The predicted and experimental results have a good consistency both in variation tendency and amplitude, and time cost of simulation is significantly reduced, which show that the presented method has high precision and calculation efficiency.更多还原