关键词: 双非均匀有理B样条, 五轴加工, 协同进化遗传算法, 参数同步

Abstract: To reduce the interpolation error of dual-NURBS tool paths by using the same node vector and to improve real time performance in the process of sculptured surfaces machining,a double-NURBS interpolation algorithm based on improved Cooperative Co-evolutionary Genetic Algorithms (CCGA) and Newton-like parameter calculating was proposed.Based on the error control,some of the cutter tip points and cutter points were selected to construct dual-NURBS curves with same node vector.To reduce the fitting error and improve the interpolation precision,weights of cutter points NURBS curve were adjusted with improved CCGA algorithms.Newton-like algorithm was utilized to calculate parameter in the process of NURBS interpolation so that interpolation error and calculation time were further reduced.The experimental result showed that the proposed algorithm could effectively improve the interpolation accuracy and real time performance by comparing to other methods.

Key words: dual-Non-Uniform Ration B-Spline curve, five-axis machining, cooperative co-evolutionary genetic algorithms, parameter synchronization