The residual stress on the surface layer of railway bearing rings is divided into tensile stress and compres-sive stress.During train operation,under the action of residual tensile stress,the bearing rings are prone to crack initia-tion and accelerated propagation,while residual compressive stress can partially offset the tensile stress applied by the working load,which can suppress crack initiation and propagation so that the contact fatigue life of the bearing rings is extended.Therefore,when producing bearing rings,it is hoped that the product maintains a residual compressive stress state.By arranging reasonable manufacturing processes,selecting appropriate process parameters,and improving the cooling effect of grinding fluid,the residual compressive stress on the surface layer of the ring can be controlled within a reasonable range.After heat treatment,initial grinding,additional tempering,and no additional tempering,final grind-ing,and ultra precision,residual stresses on the surface layer of the bearing ring were tested.It is verified that process control can keep the residual compressive stresses on the surface layer of the ring within the expected results.
Rolling Bearings for TrucksBearing RingSurface Stress StateResidual Compressive StressResidual Tensile StressContact Fatigue
NETL
NSTL
万方数据
