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针对在高速加工、快速检测等高速进给条件下,传统速度控制方法容易导致工件过切、机床抖动等问题,提出了基于离散衔接点曲率加权累加的速度前瞻程序段数动态选择的方法。首先,分析了基于5次样条曲线拟合离散衔接点方法,然后推导了到各衔接点的曲率表达式,最后根据各点曲率加权累加值进行动态速度前瞻程序段控制,并进行了仿真验证。仿真结果表明,动态速度前瞻避免了前瞻路径过短不能完成减速要求和前瞻段数过多占用系统资源,一定程度上解决了速度和精度的冲突问题,提高了系统的性能和加工效率。
Aiming at the problems such as over-cutting, jitter and so on, which are easily caused by the traditional speed control method under high-speed machining and rapid inspection, the method of dynamic selection of the number of speed look-ahead blocks based on the weighted sum of discrete convergence points is proposed. Firstly, the method of fitting splines based on the fifth-order spline curve is analyzed, and then the curvature expression to each convergence point is deduced. Finally, the dynamic speed forward-looking block is controlled according to the weighted value of each point, and the simulation is validated . The simulation results show that the dynamic speed forward-looking avoids too short of the forward-looking path, can not complete the deceleration request and excessively consumes system resources due to the excessive number of look-ahead segments, resolves the conflict between speed and accuracy to some extent, and improves system performance and processing efficiency.