Reliability Evaluation Method For Thermal, Elastic And Flow Coupling Servo Characteristics Of Rolling Bearings

With the development of science and technology,aero-engine,high-speed railway,intelligent precision robot,large high-grade CNC machine tools and other major equipment on the design,manufacture and use of rolling bearings put forward higher requirements.Rolling bearing is a key supporting part widely used.It is required to have long life and high reliability when it is in service under the limit working condition for a long time.Bearing lubrication condition has an important influence on its servo performance.Understanding servo lubrication mechanism of rolling bearing can greatly improve its bearing capacity and service life.Therefore,it is of great significance to carry out reliability analysis and finite element calculation of thermal,elastic and flow coupling servo characteristics of high-performance rolling bearings.Based on ANSYS platform,this paper simulates the multi-field coupling of thermal,elastic and flow of rolling bearings,and quantitatively analyzes the influence of various parameters on the servo process of rolling bearings in the multi-field coupling of thermal,elastic and flow based on reliability theory.The main contents are:(1)Based on the fluid mechanics theory,CFD numerical simulation method was used to calculate the flow field of rolling bearing,and the pressure distribution,velocity distribution,velocity vector diagram and trajectory diagram of lubricating oil film were obtained.Based on the reliability theory,the lubrication flow field of rolling bearing is analyzed,and the sensitivity of bearing parameters to the influence of the flow field is calculated quantitatively.(2)The numerical model of rolling bearing with and without cage is established,and the flow field of rolling bearing is calculated numerically.On this basis,the thermal,elastic and flow coupling of the bearing are numerically calculated,and the effect of the presence or non-presence of the cage on the servo characteristics of the bearing is discussed.(3)A fully coupled model of rolling bearing with cage is established,and the multi-field coupling calculation of rolling bearing is carried out to obtain the equivalent stress and strain of the bearing under the multi-field coupling of heat,elastic and flow.By comparing the calculation results of thermal and elastic coupling with those of thermal,elastic and flow coupling,it is shown that whether or not the flow field is considered has a great influence on the calculation results in the multi-field coupling servo analysis of rolling bearing.(4)Based on the numerical calculation results of thermal,elastic and flow coupling of rolling bearing,3×3 orthogonal test table was established by response surface method,and the reliability sensitivity of the influence of structural parameters of inner,outer ring and rolling body of rolling bearing on the coupling calculation results was calculated.(5)Based on the numerical calculation of thermal,elastic and flow coupling of the rolling bearing,the fatigue life of the rolling bearing was calculated,and the instantaneous damage and life value of the servo process of the bearing were obtained,which laid a theoretical foundation for the design and manufacture of the rolling bearing.