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提出一种基于三角网格曲面的环切粗加工刀轨生成算法,该算法采用R*-tree建立三角网格曲面的动态空间索引结构,基于该结构快速建立三角网格模型的Z向包络面,采用R*-tree建立Z向包络面的索引结构,对切削平面与Z向包络面求交获取截面轮廓环,判断截面轮廓环的环向,并依据轮廓环间的拓扑关系确定切削区域,通过对轮廓环进行等距偏置获取环切粗加工刀轨.实例证明:该算法对各类复杂三角网格曲面均可准确生成无干涉环切粗加工刀轨,并可实现模型的区域性加工.
This paper presents an algorithm to generate cutter path of Rough cutting based on triangular mesh surface. This algorithm uses R * -tree to establish the dynamic spatial index structure of triangular mesh surface. Based on this structure, the Z-envelope of triangular mesh model Surface, the index structure of the Z-envelope surface is established by R * -tree, the cross-section contour ring is obtained by intersecting the cutting plane and the Z-envelope surface, the ring direction of the cross-section contour ring is judged, and the topological relationship between the contour rings is determined The cutting area is obtained by equidistant offset of the contour ring to get the roughing and cutting track.The example proves that the algorithm can accurately generate the roughing toolpath without any interference on all kinds of complex triangular mesh surfaces and can realize the model Regional processing.