内圆角铣削加工几何分析及铣削力预测

摘要

为实现内圆角加工瞬时铣削力预测,提出了工件轮廓和刀具路径的参数化表示方法,依据圆弧角大小不同将内圆角铣削分为两类,分析了其铣削过程.建立了瞬时铣削力模型,采用等参数间隔法,推导了刀具瞬时位置和位置角计算公式.针对不同铣削阶段,给出了实际径向切深计算模型,提出了基于实际径向切深的瞬时未变形切屑厚度计算方法.对内圆角加工的铣削力预测,并进行试验验证.仿真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,表明提出的铣削力模型具有较高的精度和计算效率,从而为恒负载铣削和颤振抑制提供了理论基础.%To predict the milling force for filleted corner milling,a method is proposed to describe workpiece contour and tool path with parametric representation.According to arc angle,filleted corner milling is divided into two categories.Milling process of each category is analyzed respectively.An instantaneous milling force model is presented.In the model,instantaneous position and position angle of the tool are calculated with same parameter interval.Calculation formulas of actual radial cutting depth for each milling stage are proposed.Further,a method is presented to calculate the instantaneous uncut chip thickness using actual radial cutting depth.Milling simulations and milling tests are carried out to verify the presented method.A good agreement both variation tendency and magnitude between predicted results and experimental results is achieved.Also,simulation time is reduced significantly.These show that the milling force model is efficient and accurate.So,the research can provide theoretical foundation for constant load milling and chatter suppression.