Research On Shaft Rotation Accuracy Considering Rolling Braeing Wear With High-Speed State

High-speed and precision are the main development direction of modern processing technology.The stable support characteristics of rolling bearing are increasingly required when the rotating shaft of various processing equipment runs at high-speed.The wear of rolling bearing raceway will directly affect the rotation accuracy of the shaft,resulting in a decrease in the surface quality of the processing parts.In order to ensure the rotation accuracy of the shaft at high-speed,it is necessary to study the wear of the rolling bearing and the offset of the shaft end caused by the wear of the rolling bearing.In this paper,a comprehensive study is carried out on the wear of the raceway surface of angular contact ball bearings and the shaft end offset caused by wear under certain parameters.The main research contents are as follows:Firstly,the internal contact characteristics of angular contact ball bearings under external load conditions are analyzed.The force analysis of high-speed angular contact ball bearing is carried out by using quasi-static model.The contact parameters such as contact load,contact angle and contact pressure of the rolling element at different positions are calculated.Secondly,considering the change of contact pressure while the temperature of angular contact ball bearing increases,the heat generation of angular contact ball bearing during highspeed operation is analyzed and calculated by Palmgren friction torque model.Thermal conductivity coefficient and convective heat transfer coefficient are calculated.The temperature field of angular contact ball bearing and shaft support structure is analyzed by ANSYS finite element analysis software.A thermal expansion contact model which is accord with the actual deformation is proposed,and the comprehensive contact deformation and contact pressure inside the angular contact ball bearing are calculated more accurately while the temperature increases.Then the wear depth distribution of angular contact ball bearing raceway surface is studied.The motion analysis of the angular contact ball bearing is carried out.The relative slip distance,the number of stress cycles and the contact pressure between the rolling element and the inner and outer ring raceway surface are calculated.The Archard wear model is modified and the wear depth on the contact area of the inner and outer ring raceway surface of the bearing is calculated.The influence of parameter changes on the wear depth of rolling bearings is analyzed.Finally,the shaft end offset model is established to analyze the influence of the wear depth of the angular contact ball bearing on the shaft end offset.The shaft offset measurement experiment was carried out,and the shaft end offset change caused by the wear of the angular contact ball bearing under certain parameters was compared to verify the accuracy of the shaft end offset model.The influence of rolling bearing wear on shaft end offset and shaft rotation accuracy is analyzed.The research results and experimental analysis of this paper could provide some reference for other types of rolling bearing wear law and high-speed shaft rotation accuracy analysis.