Thermal Structure Coupling Analysis Of Angular Contact Ball Bearings

A rolling bearing is an indispensable part of modern mechanical equipment.Its main function is to support the mechanical rotating parts to reduce the friction coefficient of mechanical load in the process of transmission.Because the rolling bearing has the advantages of simple structure,flexible start,small friction resistance,simple maintenance and easy interchange,the rolling bearing is widely used.In the actual working condition,the components of the bearing in contact with each other rub against each other and generate heat,resulting in the excessive temperature of the bearing system,resulting in the thermal deformation of the bearing and the change of the internal contact state,thus affecting the accuracy and life of the bearing.Therefore,the study of bearing thermal structure is of great significance.Taking angular contact ball bearing as an example,the following work is carried out on bearing thermal characteristics under different working conditions:(1)Taking 25TAC62 B angular contact ball bearing as an example,a finite element model for transient thermal analysis of bearing was established and the heating power of the bearing was calculated.Moreover,ANSYS Workbench was used to simulate and analyze the temperature field and thermal deformation of the bearing.The temperature rise and temperature distribution of bearing inner and outer ring and ball of bearing are discussed and analyzed under different axial force and different rotating speed.In addition,the thermal deformation and displacement trends of inner and outer rings and ball of bearing are analyzed.On this basis,the thermal characteristics of the contact area between ball of bearing and the inner and outer ring can be further analyzed,which lays a foundation for the temperature field analysis of the bearing system and the reliability analysis of the positioning accuracy induced by friction heat.(2)Based on the analysis of the temperature field of the bearing,the coupling analysis of the temperature field and the contact load is carried out.The load changes of the contact points of the inner and outer ring and ball of bearing are obtained.The thermally stress coupling analysis was carried out between the temperature field of the bearing and the surface of the inner and outer rings and ball of bearing.The variation rules of maximum,minimum and average surface stresses of inner and outer rings and ball of bearing are obtained.It provides a basis for further analysis of bearing capacity.(3)Based on the transient analysis model of bearing thermal structure proposed in this paper,the randomness of bearing temperature rise is analyzed.Through the randomness analysis,the effect of heat flow of different elements in bearing on its temperature value is further obtained.The influence of the heat flow of the raceway inside the outer ring,raceway outside the inner ring and ball of bearing on the maximum,minimum and average temperature of the raceway is obtained.It lays a foundation for further exploring the thermal induction reliability of high-speed bearing.(4)The finite element model for transient thermal analysis of the bearing is tested with the support bearing of the machine tool feeding system as an example,and the validity of the finite element model is proved.