三次多项式型微段高速加工速度规划算法研究

为满足高速数控加工的要求,提出了一种三次多项式加减速控制模型.该模型能保证高速运行过程中加速度的连续,使机床运行平稳,避免产生大的冲击.针对连续微段的高速加工,建立了满足最大速度、最大加速度、几何运动轨迹及长度约束条件下的轨迹速度规划策略,并给出三次多项式型速度规划算法的实现流程图.试验结果表明,该算法能实现连续微段间进给速度的高速衔接,大大缩短加工时间并提高加工效率.该算法已成功应用于多坐标数控高速微细加工系统中.

Velocity planning algorithm for high speed machining of micro line blocks based on cubic polynomial model

To satisfy high speed Numerical Control(NC) machining,an acceleration and deceleration control model was proposed,and the speed curve was also constructed by the cubic polynomial.The proposed control model provided continuous acceleration and avoided intense vibration in high speed NC machining.Aiming at high speed machining of consecutive micro line blocks,velocity planning strategy was set up under the constraints of maximum speed,acceleration,geometric path and length of micro line block.Flow chart of velocity planning algorithm based on the cubic polynomial model was also presented.Experimental results demonstrated that the proposed algorithm realized high speed machining of consecutive micro line blocks,and the productivity was improved significantly.It was applied in multi-axes high speed micro fabrication machining.