关键词: 滚珠丝杠, 轴承, 预紧力, 模态分析

Abstract:

A finite element model taking the ball screw of a horizontal hone as the research object is established to study the effect of bearing preload on the dynamic characteristic of ball screw system.Elastic constraint is used to simulate the supporting to ball screw exerted by bearings.A modal analysis based on the finite element method is accomplished.The natural frequency under different pretightening force is obtained by modifying the support stiffness on different bearing preload.The results show that the stiffness of a ball screw system changes under different bearing preload,and thus the natural frequency of the system increases with increasing preload.

Key words: ball screw;bearing;preload;modal analysis