Abstract: The prediction and analysis of thermal mechanics coupling performance of angular contact ball bearings was the key to ensure the working accuracy of machine tools. Based on Hertz contact theory and thermal network method, a dynamic thermal mechanics coupling model of ball screw feed system pair-installed bearings was established under working conditions, the internal lubrication state and the thermal expansion of ball bearings were considered under temperature rise effect, and a numerical calculation method was proposed for dynamic thermal mechanics coupling analysis of bearings. The time-varying laws of internal contact parameters and friction heat generation of the bearings were proved. Results show that the rotational speed and the external load affect the frictional contact characteristics of bearings, and the performance of bearings is significantly affected by the thermodynamics behavior. The dynamic thermal mechanics coupling analysis model proposed herein may effectively predict the contact characteristics of bearings under nonlinear thermal behavior. 

Key words: CNC machine tool feed system, angular contact ball bearing, thermal mechanics coupling analysis, thermal network method, time varying dynamic characteristic

摘要： 对角接触球轴承热力耦合性能进行预测分析是保证机床工作精度的关键。基于赫兹接触理论结合热网络方法，建立滚珠丝杠进给系统成对安装轴承工作状态下的动态热力耦合模型，考虑了温升热效应下的球轴承内部润滑状态以及热膨胀，提出了轴承的动态热力耦合分析数值计算方法。探明了轴承内部接触参数和摩擦生热的时变规律。研究表明：转速、外部载荷等工况影响轴承的摩擦接触特性，轴承性能显著受热力学行为的影响。提出的轴承动态热力耦合分析模型可以有效预测轴承非线性热行为下的接触特性。

关键词: 数控机床进给系统, 角接触球轴承, 热力耦合分析, 热网络法, 时变动态特性