Abstract: In a five-axis flank milling process,the tool rotation profile error caused by tool runout has a great influence on the machining accuracy of workpiece.A new comprehensive error prediction model was presented based on the pre-existing tool path error prediction model.The distribution of tool contact points on the machined surface was calculated to reconstruct the machined surface,thereby predicting the machining accuracy.To deal with the difficulty of measuring the tool runout error,a test method was designed for accurately obtaining the tool error parameters,which could support the model calculation.The validity of the prediction model was verified by the comparison experiments.

Key words: five-axis flank milling, tool runout, machining accuracy, comprehensive error prediction model, tool contact point

摘要： 五轴侧铣加工时,刀具跳动引起的回转轮廓误差会影响工件表面加工精度。在现有刀位轨迹误差预测模型基础上,引入刀具回转轮廓误差建立了一种新的综合误差预测模型,由该模型可以计算得到加工表面刀触点分布,实现加工表面重构从而进行加工精度预测。针对刀具跳动误差难以测量的情况,设计了一种试验方法,从而精准地获取刀具误差参数,并用于模型计算。通过对比试验验证了该预测模型的有效性。

关键词: 五轴侧铣, 刀具跳动, 加工精度, 误差预测模型, 刀触点