Research On Simulation And Experimental Of Residual Stress In Power Spinning Rod Bushing

The diesel engine connecting rod is one of the connecting parts of the piston and the connecting rod.It will bear alternating role of the pressure of the cylinder and the inertia of connecting rods in its working state.Besides,it always works in serious conditions with high cost of maintenance,so the diesel engine connecting rod need an excellent performance.The connecting rod bushing would have a comprehensive performance,high fatigue strength,carrying capacity and other advantages after power spinning.Therefore,the powers pinning process is also considered the ideal machining process for diesel engine connecting rod bushings.However,the residual stress will generate in the surface of the connecting rod bushing due to different process parameters,metal accumulation,uneven metal flow and other controllable and uncontrollable factors In the power spinning process.The existence of residual stress will result in the change of the dimensional accuracy,the shape error,the fatigue strength,the static strength and the hardness of the connecting rod bushing,which affects the service life of the diesel engine.Therefore,it is of great significance to improve the service life of the connecting rod bushing and guide the actual production by research on the distribution law of residual stress,the influence law of strong spinning process parameters on residual stress and reduce the residual stress.In this paper,the tin bronze(QSn7-0.2)was taken as raw materials,The power spinning rod bushing was taken as the research object.It was based on the elastro-plastic finite element method,the finite element simulation of the residual stress of the connecting rod bushings after the strong spinning process and the machining,Main research contents:(1)The simulation model of the three-wheel offset spooling was established and the finite element simulation was carried out based on the finite element simulation software of ABAQUS finite element simulation software.(2)This paper analyzed the forming process of the connecting rod bushing and studied the forming process of axial,circumferential and radial residual stress in the simulation process.(3)The influence of the parameters of the power spinning process on the residual stress was analyzed by designing the simulation scheme and the simulation of the power spinning process and its data.(4)By designing a set of orthogonal experiments,the influence order of the power spinning process parameters on the residual stress was analyzed,and the reliability of the simulation was verified.The results show that the process parameters such as the reduction rate,the feed ratio and the spindle rotation have important influence on the residual stress on the surface of the connecting rod.The influence of the thinning is the most obvious.The simulation of the forming process of the connecting rod is carried out by ABAQUS,it can be used in the actual production to reduce test costs,save time.