不同指令轨迹条件下滚珠丝杠进给系统运动精度特性研究

Study on tracking precision characteristics of ball screw feed system under different set-trajectory conditions

滚珠丝杠进给系统是高档数控机床重要部件,其运动精度决定了多轴联动加工机床的加工精度,在高速、高精度滚珠丝杠进给系统中,其指令轨迹参数是影响运动精度的重要因素。基于Simulink和Simscape搭建滚珠丝杠进给系统半物理机电耦合仿真模型,考虑不同指令轨迹参数,开展运动精度仿真及分析。结果显示,指令轨迹的位置、速度和加速度等参数对滚珠丝杠进给系统运动精度有重要影响,因此,在多轴联动加工机床中,合理规划进给系统轨迹参数对于提高其运动精度具有重要意义。

Ball screw feed system is an important part of high-grade numerical control machine tool, and its motion accuracy determines the processing accuracy of multi-axis machining machine tool. In the highspeed and high-precision ball screw feed system, its set-trajectory parameter is an important factor affecting the motion accuracy. In this paper, a semi-physical electromechanical coupling simulation model of ball screw feed system was built based on Simulink and Simscape, and motion accuracy simulation and analysis were carried out considering different command trajectory parameters. The results show that the position, velocity, and acceleration of the command trajectory have an important impact on the motion accuracy of the ball screw feed system. Therefore, in the multi-axis linkage machining machine tool, reasonable planning of the feed system trajectory parameters is of great significance to improve its motion accuracy.