三角网格模型多轴数控雕刻刀轨生成算法  

Generating algorithm of multi-axis NC engraving-path for triangular mesh model

作　　者：孙殿柱[1] 崔传辉[1] 李延瑞[1] 康新才[1] 

机构地区：[1]山东理工大学机械工程学院,山东淄博255091

出　　处：《江苏大学学报（自然科学版）》2011年第4期416-422,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51075247);山东省自然科学基金资助项目(ZR2010EM008)

摘　　要：提出一种基于三角网格模型的多轴数控雕刻刀轨生成算法,用于解决三角网格模型的多轴数控雕刻刀轨的生成效率低、存在刀轨干涉等问题.该算法采用R*S树动态空间索引结构组织三角面片的拓扑近邻关系,并依据三角网格模型的型面特征规划刀位驱动点,获取各驱动点的瞬时加工区域;根据刀具与瞬时加工区域中各三角面片的相切关系采用面相切、边相切或顶点相切刀位计算方法获取相应无干涉刀位点;检测相邻刀位点间的极限加工误差并采用二分插值法实现刀轨的精度控制,最终生成满足精度要求的无干涉多轴数控雕刻刀轨.实例证明:该算法可生成复杂三角网格模型的多轴数控雕刻刀轨,刀轨生成精度高、运行速度快,可有效避免干涉.In order to solve the problems of inefficiency and interference in multi-axis NC engraving tool path generation for triangular mesh model,an algorithm was proposed based on triangular mesh model.R＊S tree dynamic space index structure was adopted to organize the topological neighbor relationship of triangular mesh.According to the surface feature of the triangular mesh surface model,the tool-position driving point was mapped out to obtain the transient processing area of each dive point.Based on the tangency relationship between the cutter and the triangles in the instantaneous processing area,the interference-free cutter location points were calculated by the calculation methods of surface tangent,vertex tangent and edge tangent.In order to meet required precision,interference-free multi-axis NC engraving-path could be achieved before limit machining error detection between the adjacent cutter location points and precision control by dichotomy.Experimental results show that the algorithm is efficient for the accurate and fast gene-ration of interferential-free multi-axis NC engraving tool path of complex triangular mesh model.

关 键 词：三角网格 数控雕刻刀轨 动态索引 刀位点计算 二分插值法 

分 类 号：TP391.73[自动化与计算机技术—计算机应用技术]