滚珠丝杠副滚珠循环系统的动力学研究和仿真

研究滚珠丝杠副的滚珠循环系统中的碰撞接触现象,根据赫兹接触理论和经典碰撞理论,并考虑滚珠和导珠管的几何外形、丝杠的转动速度等因素,建立滚珠和导珠管碰撞接触的动力学模型。在此基础上分析了滚珠的入口速度、材料密度对碰撞力大小、接触时间的影响。应用多体动力学软件Adams,根据实际物理参数,创建了导珠管和滚珠的几何模型,对钢珠在导珠管中的运动情况进行仿真模拟,获得了碰撞过程中滚珠的运动轨迹、速度、加速度以及碰撞力的变化情况。通过对不同参数的物理模型理论计算和仿真,分析了影响滚珠循环系统动力学的主要因素。理论计算和仿真、试验结果吻合较好,这对于优化导珠管结构,研究开发新型滚珠丝杠副有重要的意义。

DYNAMIC ANALYSIS AND SIMULATION OF A RE-CIRCULATION MECHANISM IN BALL SCREW

It is a on solving contact-impact problems of a re-circulating mechanism in ball screw. The dynamic model of contact-impact between balls and a return tube is presented based on Hertz contact theory and the classical collision theory. The dynamic equation considering geometric sizes of balls and the return tube as well as factors the operational speed of the such as ball screw, etc is developed. Based on the dynamic model, the effects of the entrance velocity of the balls and the material density on the impact force and the contact time are analyzed. The recirculation of the ball in the return tube is simulated using the multi-body dynamics software ADAMS, and the model is developed according to real parameters. The trajectory, velocity and acceleration of the ball and other dynamic results in the recirculation are obtained. Furthermore, the influence factors on the ball screw dynamic performance are investigated by changing its geometric and physical parameters. The simulation results are consistent with those from tests. The model proposed is significant to optimizing structure of return tubes and further study on dynamic properties of ball screw drive.