曲面近似理论在进给速度优化研究中的应用

Application of theory on surface approximation in the research of feed-rate optimization

提出了一种基于曲面近似理论的进给速度动态优化方法,即根据曲面在空间一点邻近范围内的近似结构类型,对近似曲面在实际加工中的不同情况进行研究,总结出若干种典型的加工工况,进行分析、定义与建模,得到典型工况下的进给优化模型;在刀位点邻域内对被加工的自由曲面类零件进行相应曲面结构类型的近似,并根据加工过程中刀位点处的曲率、走刀方向、刀轴矢量等进行简化与匹配,得到简化的工况序列,进行基于曲面近似的进给速度优化,达到对自由曲面类零件进给速度动态优化的目的。

The method for optimization of feed-rate is proposed based on the theory of surface approximation.Namely different cutting conditions of approximation surface in practical machining are studied according to the approximation type of surface on one point in space neighborhood.Several typical machining conditions are summed up, analyzed, defined and modeled,Optimization models of feed-rate for typical machining conditions are educed. In neighborhood of each CL-point the parts of free-form are approximated to the type of the typical surface.Machining conditions are matched according to the curvature, feed direction and tool axis vector of process and a series of matched machining conditions are obtained. The feed-rate based on the matched machining conditions is optimized. The purpose of optimizati on the feed-rate dynamic for machining the parts offree-form surface is achieved.