关键词: 高速加工, 短线段, 运动学, 跳度, 平滑算法, 数控系统

Abstract: In the processing of continuous short-segments tool path,the changes of machine drive shaft speed and acceleration would lead to tool vibration and affect processing quality.For these problems,a new kinematic smoothing algorithm for high speed and high precision CNC machine tools was proposed.For the continuous short-segments tool path,its boundary conditions included velocity,acceleration and displacement were attached by constraining the acceleration curve with jounce.The optimal speed of corner and the maximum speed of short-segment were deduced through combining with the maximum contour error and the kinematic limit of the driver,which achieved smooth speed and acceleration of feed axis.Through the comparative test analysis of linear acceleration/deceleration algorithm,when the continuous short-segments tool path with 29 corners had been processed,the machining time reduced by 11%,the tool path reached G3 continuity,the velocity curve reached G2 continuity and the acceleration curve reached G1 continuity.The tool vibration was reduced effectively and the processing quality was improved.

Key words: high-speed machining, short-segments, kinematic, jounce, smoothing algorithm, numerical control system