摘要
为了解轴承预紧力对滚珠丝杠系统动态特性的影响,以某卧式磨床滚珠丝杠为研究对象,建立了丝杠的三维模型,并以弹性支承约束模拟角接触球轴承对丝杠的支承。在此基础上,利用ANSYS对磨床滚珠丝杠系统进行模态分析。通过修改不同预紧力下轴承的支撑刚度,得到了在不同预紧力下的系统各阶固有频率。分析结果表明,在不同的轴承预紧力下,滚珠丝杠系统的结构刚度会发生变化,使系统的固有频率改变,且随着预紧力增大而增大。磨削状态稳定时,磨削预应力对滚珠丝杠系统的影响较小。
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.
出处
《电子科技》
2016年第3期90-92,96,共4页
Electronic Science and Technology
