关键词: 数控系统, 加工, 自适应细分, 细分次数, 覆盖网格, 计算机辅助制造

Abstract: To obtain Numerical Control (NC) rough machining models with uniform machining allowance, an adaptive subdivision algorithm based on surface error was put forward. By comparing the least distance between subdivided control mesh and limit surface with rough machining allowance, the uniform subdivision depth was determined. A cover mesh was generated by projecting control mesh to the limit surface. The distance between cover mesh and limit surface was used as the self-adaptive subdivision criterion to adaptively subdivide the areas which were not satisfied with specified error tolerance. Examples showed that this method could remarkably decrease the number of meshes, keep the good fairness and then significantly increase the processing speed of model.

Key words: numerical control system, machining, adaptive subdivision, subdivision depth, cover mesh, computer aided manufacturing