关键词: S曲线加减速, 前瞻自适应速度优化, 衔接进给速度, 高速加工, 数控系统

Abstract: To realize high-speed feedrate linking for high speed machining, and to avoid the impact of Computer Numerical Control (CNC) equipments caused by acceleration gust, a look-ahead and adaptive speed optimization algorithm based on pre-interpolation S-curve acceleration and deceleration was proposed. According to the transitions of the machining segments, the algorithm could automatically adjust the numbers of the preprocessing segments. With two constraints, the linking feedrate limitations of the preprocessing segments and the smooth deceleration of the machining process, the optimal linking feedrate was sought to achieve the maximum feedrate based on the discrete S-curve acceleration and deceleration. The obtained optimal linking federate acted as the actual ending velocity of the corresponding machining segment, speed control of the segment could be realized. The implementation of the algorithm for high speed equipments was given, and the algorithm was applied in pipe cutting CNC system. Experimental results showed that the proposed algorithm could realize high-speed and smooth transitions while satisfying high-machining requirements.

Key words: S-curve acceleration and deceleration, look-ahead and adaptive speed optimization, linked feedrate, high speed machining, computer numerical control