关键词: 双向扫描算法, 速度规划, 进给速度约束, 高速加工, 数控系统

Abstract: To improve processing speed for Computer Numerical Control (CNC) products, a velocity planning method of micro line blocks based on bidirectional scan algorithm was presented. Based on linear acceleration and deceleration, the key feed-rate constraints of the micro line blocks machining process were deduced and a velocity planning mathematical model for path connection point was established, and a bidirectional scan algorithm was put forward which was aimed to have maximum feed-rate, And it was used to achieve maximum productivity in machining of consecutive micro line blocks with high speed. Through the forward and backward scanning of the machining path, a feed-rate feasible region could be obtained, which satisfed many constraints such as geometric property of micro line path and physical restrictions of the machine tool. Simulation and machining results demonstrated that the algorithm could achieve high velocity on the connection point of tool path, and the machining efficiency could be improved dramatically.

Key words: bidirectional scan algorithm, velocity planning, feed-rate constraint, high speed machining, computer numerical control