关键词: 数控系统, 参数曲线, 自适应插补, 前瞻插补, 算法

Abstract: To realize smooth federate and reduce impact on machine tools caused by dramatic velocity changes, a real-time and look-ahead interpolation algorithm for parametric curve was proposed. This method improved the machining accuracy and detected the sensitive points by confining the chord error in a limited range. Through dividing look-ahead distance into two parts, sensitive points were analyzed, a continuous velocity and accelerating profile were found out which reduced the jerk relate problem. This satisfied not only machining accuracy but also acceleration and deceleration performance of machine tools. By example in RT-Linux, it was revealed that the algorithm could adapt to various changes in curves, and the feasibility and precision of the proposed interpolation algorithm were also verified.

Key words: computer numerical control system, parametric curves, adaptive interpolation, look-ahead interpolation, algorithm