关键词: 三角网格, 网格单元, 映射规则, 螺旋轨迹, 刀具

Abstract: To further improve the surface quality of NC machining surface,a generation method of constant scallop spiral path based on triangular grid was put forward.Based on taking the geometry and dynamics characteristics of tool-path and triangular grid cell into account,the number of carrying knives was reduced effectively and the continuity of tool-path was maintained.This method starting biased from cutter contact point on mesh boundary and planning biased cutter location point on parameter field site layer by layer.The spiral track was fitted with NURBS fitting algorithm,and the spiral tool-path was obtained by inverse mapping it on the meshes finally.The simulation results showed that the track met the actual processing requirements compared with that of traditional ways such as section method and circuit cutting method.

Key words: triangular mesh, grid cell, mapping rule, spiral tool path, machining tool