基于平底刀切宽张量的曲面分区加工轨迹生成方法  

Machining Strip Width Tensor Based Toolpath Generation Method for Freeform Surface Machining

作　　者：许锡春[1] 李迎光[1] 刘旭[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《南京航空航天大学学报》2016年第6期847-855,共9页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：江苏省杰出青年基金(BK20140036)资助项目

摘　　要：为提高曲面端铣加工的效率,在保证加工质量的前提下,应尽量保证刀具在各切触点处沿切宽最大的进给方向运动。复杂曲面上各点处的切宽最大进给方向常呈现区域化分布规律,基于单个加工区域的传统端铣轨迹生成方法仅能得到局部优化解。本文给出了平底刀端铣曲面切宽张量,将切触点处的最优进给方向求解转化为张量特征方向的求解,并基于切宽张量场的退化性质,提取三分退化点为曲面多个加工区域的交点,进而以相交点为起点、以最优进给方向为切向构造曲面内部边界,将曲面划分为一系列加工区域,各加工区域的最优进给方向分布连续,分别生成各区域的加工轨迹。该方法在CATIA CAM系统中实现,选例进行了应用验证,与传统的曲面加工轨迹生成方法相比,基于切宽张量的平底刀端铣分区加工方法显著提高了加工效率。To improve the end-milling efficiency of freeform surface,the feed direction with maximal machining strip width should be chosen at each cutter contact point.Those optimal feed directions usually present a regional regularity overall the freeform surface.However,in most traditional tool path generation methods,the surface is treated as one machining region thus only local optimization might be received.In this paper,the machining strip width tensor of flat-end tool is proposed.Then to get the optimal feed direction the corresponding eignvector of the tensor is calculated.By extracting trisector degenerate points within the tensor field,intersections of adjacent sub-surfaces are selected as starts to construct inside boundaries to divide the surface.Finally,tool paths are generated in each sub-surface separately applying the Iso-scallop method.The proposed method is realized in CATIA CAM platform and tested using one freeform surface.The comparison to several leading existing tool path generation methods is also provided.

关 键 词：自由曲面 切宽张量 最优进给方向 端铣加工 分区加工 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]