多轴联动数控系统连续小线段速度前瞻规划

A velocity look ahead algorithm for continuous short blocks in multi-axis linkage CNC system

在复杂路径的高速加工过程中,容易产生加速度冲击,引起机床振动和工件过切等问题,因此需要提前对加工速度进行优化处理。文章首先利用当量关系对多轴联动数控系统进行分析,然后采用直线加减速对单一路径段进行前加减速处理;最后分析路径段间衔接速度的约束条件,并提出一种速度前瞻控制算法。仿真结果表明,该算法处理后的进给速度平滑连续,有效提高了加工效率。

Impact of acceleration is a common problem in high speed manufacturing for complicated path, causing vibration of machine and overcutting. Velocity planning, therefore, should be carried out in advance. Using equivalent relation, the paper firstly analyzes the coordinated motion of multi-axis CNC systems and linear velocity planning is adopted to handle with a single path. Then constraints on linking velocity between adjacent lines is calculated and accordingly a velocity look-ahead algorithm is presented. Simulation results show that the proposed algorithm can achieve smooth feed velocity. Thus effectively enhances the productivity of manufacturing.