建立了高速加工轨迹中的直线段、圆弧段、NURBS曲线段等基本曲线的几何模型,并在常用的、具有无柔性冲击特点的S曲线加减速控制模式下,以最短时间为优化目标,建立了约束条件下的速度规划方程组,给出了统计加工总时间的软件算法,从而为高速加工轨迹的效率评价提供了客观依据.同时,在完成速度规划之后,给出算法流程,计算每条直线段、圆弧段、NURBS曲线段所需要的加工时间,从而统计加工总时间,作为高速加工轨迹效率评价的技术指标.
Geometrical model for basic curves of high speed machining (HSM) trajectories was built, including line segments, circle ones and non-uniform rational b-splines (NURBS) ones. Taking the minimum time as an optimized objective, kinematical equation group of velocity planning was proposed under the constrained conditions of S curve acceleration, a computer numerical control (CNC) control- ling model without flexible impact. Statistical algorithm for total machining time was developed to compute machining time of each line segment, circle one and NURBS segment so that the statistic time can be used as an technical index of discussing the efficiency of high speed machining.