高速滚珠丝杠副动态特性分析

Study of the Dynamic Characteristic of High-speed Ball Screw

以赫兹接触理论和沟道控制理论为基础,同时考虑自身离心力以及陀螺力矩作用的影响,建立轴向载荷作用下的高速滚珠丝杠副动力学模型.采用数值分析方法计算不同运行工况对滚珠丝杠副力学特性的影响,得到了接触角、弹性变形等的变化规律.分析结果表明,转速和轴向载荷等工况对高速时滚珠丝杠副的动态特性影响较大,高速时滚珠丝杆副的动态特性较低速情况有着显著的变化.

Following the hertz contact and raceway control theory of the ball screw and considering the centrifugal force and gyroscopic moment acting on the ball screw, the dynamic model of high-speed ball screw was set up with consideration of pretension. The effects of different working conditions, such as the running speed and the axial preload, on the mechanical properties of the ball screw were studied and solved through numerical analysis. The result has shown that these factors affect the dynamic characteristic of ball screw dramatically, and the dynamic characteristic of ball screw at high speed is greatly different from that of ball screw at low speed.