关键词: 滚珠丝杠, 工作台, 振动位移, 正交试验

Abstract:

A mathematical model of feed system of an CNC machine was established using Lagrange equation and energy principle, and the influences of parameters on the vibration displacement of workbench were analysed. According to the results of orthogonal tests, it is concluded that the biggest three factors that influence workbench's vibration displacement are the ball screw's lead h, the table mass m and the longitudinal contact stiffness kn in the connection of the table and ball screw. On the feed system test-bed, the longitudinal amplitudes and torsional amplitudes of workbench were measured, they show that the larger the ball screw's lead and  the mass of the workbench the bigger, the greater the axial amplitude of the workbench; and the longitudinal contact stiffness in the connection of workbench and ball screw, the smaller the axial amplitude of the workbench.

Key words: ball-screw, workbench, vibration displacement, orthogonal test