关键词: 五轴数控加工, 环形刀具, 多点切触, 遗传算法, 最短有向距离

Abstract: For the low computational efficiency and the inadequate maximization of machining strip width,a multi-point contact cutter orientation calculation method based on genetic algorithm was proposed for the toroidal cutter of 5-Axis NC machining.After transforming the initial toroidal cutter model with the given yaw angle and tilt angle and transforming the cutter orientation optimization area,the directed shortest distance between the discrete cutter model and the surface of the cutter orientation optimization area was accurately calculated for avoiding local gouging.To accurately calculate the machining strip width,the cutter model was moved by the directed shortest distance and then intersected with the constant scallop-height offset surface of the surface in the cutter orientation optimization area.Regarding the cutting strip width as the optimization target and regarding the yaw angle and tilt angle as the coding variables,a genetic algorithm was used to find the optimal yaw angle and tilt angle corresponding to the maximum machining strip width.Examples showed that the proposed algorithm could effectively achieve the optimization of 5-axis machining cutter orientation of toroidal cutter with the larger machining strip width and the higher computational efficiency.

Key words: five-axis NC machining, toroidal cutter, multi-point contact, genetic algorithms, shortest directed distance