Research On Residual Stress Filed Distribution And Macroscopic Deformation Law Of Bearing Inner Ring Subjected To Laser Peening

Flexible bearing is the core component of harmonic reducer,and its performance directly affects the service life of harmonic reducer.As a key part of a flexible bearing,the inner ring of the bearing is prone to fatigue failure when it is in service under cyclic alternating loads.Bearing inner ring is the research object of this subject,and a combination of theoretical analysis,numerical simulation and experimental research are used to carry out laser peening research,explores the laser shot peening mechanism and the control method of residual stress and macroscopic deformation,and realizes the coordinated control of the shape of thin-walled inner ring parts,which lays the foundation for the application of laser shot peening technology in the field of bearing manufacturing.The main work of the paper is as follows:(1)Analyze the formation process of the residual stress field of the material under the pressure of the laser shock wave,study the influence of the geometrical effect of the curved surface on the residual stress field distribution characteristics,establish an analysis model of the residual stress on the surface of the inner ring raceway of the laser shot peening bearing,and reveal the deformation law and control mechanism of the bearing inner ring under the action of residual stress subjected to laser peening,and provide theoretical basis for numerical simulation and experimental analysis.(2)The finite element model is built by ABAQUS for the bearing inner ring of laser shot peening,study the correlation law of laser process parameters(shock wave pressure,shot peening times,overlap rate)and the residual stress distribution on the bearing inner ring raceway surface,and analyze the residual stress The influence of the distribution characteristics on the deformation of the inner ring of the bearing and the roundness error provides guidance for the optimal control of the residual stress field and the roundness error.(3)A typical laser peening method is designed,and the effect of the peening method on the residual stress distribution and roundness error of the bearing inner is studied through numerical simulation,and the best laser peening track method is selected.Based on the response surface method,the laser process parameter optimization is carried out,the residual stress and roundness error of the bearing inner ring are taken as the target,the control model of the laser peening process parameters is established,and the optimal laser process parameter combination is determined to provide conditions for the application of the laser peening process.(4)Carry out laser shot peening to strengthen the bearing inner ring experimental research,test and analyze the residual stress,microhardness,microstructure,surface morphology and phase structure characteristics of the sample,and explore the influence of laser shot peening process parameters on the surface characteristics and performance of the bearing inner ring raceway,and clarify the strengthening mechanism of laser shot peening bearing inner ring.