关键词: 混合型加减速前瞻规划, 多节NURBS曲线, 插补, 直接卷积, 转角误差

Abstract:

NURBS curve interpolator was proposed as specified demand path for complex profile parts in high speed and high accuracy machining. In order to solve the instruction uncontinuity in the servo system and the starting speed (or acceleration) beyond the servo motor's limit, resulting in mechanical system cannot keep up with the given command, the hybrid multi-blocks NURBS curve look-ahead approach before acc/dec was adopted. The proposed approach combined the advantages of conventional approach and direct digital convolution and effectively avoided the unachievable reduction on corner errors in conventional method and the long machining time cost on the direct convolution method simultaneously. The simulation results show that the proposed strategy can make the whole interpolation process more flexible and continuous, and it can satisfy the requirements of high speed and high precision simultaneously.

Key words: hybrid acc/dec look-ahead planning, multi-block non uniform rational B-spline(NURBS) curve, interpolator, direct convolution, corner error