基于自适应采样距离场的车铣复合加工中刀具—工件接触几何计算  

Cutter-workpiece engagement calculations by adaptively sampled distance field for turn-milling

作　　者：陈圣泽 刘志兵[1] 王西彬[1] 何理论[1] 方泽平[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《计算机集成制造系统》2014年第9期2186-2193,共8页Computer Integrated Manufacturing Systems

基　　金：国家自然科学基金资助项目(50935001;51005023;51375055)~~

摘　　要：基于自适应采样距离场提出了对车铣复合加工中刀具—工件接触几何的计算方法。针对车铣复合加工中典型的运动形式,分析了加工过程中刀具—工件接触几何的特性。采用八叉树边界体积结构对初始工件的距离场进行自适应采样,并计算采样点在扫掠体积的距离场中对应的距离值,通过对上述各个采样点处对应的两个距离值进行布尔运算确定加工中工件的距离场并对其进行重建。采用三线性插值法计算运动中刀具的表面采样点到加工中工件的距离,根据距离值判定接触区域内的点,由这些点即可获得刀具—工件接触的相关参数。对所研究方法得到的刀具—工件接触几何所得的刀具—工件接触的对比结果表明,所研究的内容为车铣加工中刀具—工件接触的计算提供了一种高效率高精度的方法。Based on Adaptively sampled Distance Field （ADF）, a solution to calculate the cutter-workpiece engage- ment geometries in typical tum-milling motion forms was presented. The distance field of original workpiece was a- daptively sampled with an octree bounding volume hierarchy, and the distance values in swept volume＇s distance field were calculated. A Boolean operation between the distance fields of original workpiece and the swept volume was performed. To get the ADF of the in-process workpiece, the distance field was reconstructed from the modified sam- pies at non-vertex positions using trilinear reconstruction. Based on distance values between a set of sampling points on the cutter at given cutter locations and the in-process workpiece, the engagement could be found. The comparison with solid modeling-based solution showed that the research provided high effective and high accuracy approach for calculation of cutter-workpiece engagement in turn-milling.

关 键 词：刀具—工件接触 车铣复合加工 自适应采样距离场 扫掠体积 

分 类 号：TG659[金属学及工艺—金属切削加工及机床]