Research On Reverse Spinning Of Tin Bronze CuSn8P Forged Rod Bushing

The piston pin and the small connecting rod are important components of the high-pressure and high-power diesel engine,and are mainly connected by the connecting rod bushing.The working process of the diesel engine is the process of the connecting rod bushing and the small end of the connecting rod and the piston pin,it is also necessary to overcome the effects of high temperature environment and alternating stress during the operation of the equipment,the connecting rod bushing as a sliding bearing is a fragile part,and the quality of the connecting rod bushing can extend the life of the diesel engine.At present,the connecting rod bushing used in diesel engines is manufactured by a strong spinning process using tin bronze QSn7-0.2.Strong spinning is a kind of processing technology with less cutting.This process has great advantages in forging,extrusion,drawing and spinning,and can meet the high mechanical and dimensional accuracy requirements of the parts.The normal failure mode of the connecting rod bushing is wear failure,that is when the service life is reached,the bushing wears,the gap increases,and it cannot work normally.There are many reasons for the wear failure of the connecting rod bushing during use.In addition to the artificial accident conditions and product quality,the main causes of failure are the material,structure and assembly process of the connecting rod bushing.In this paper,the tin bronze CuSn8 P material is used,and the forming process of the stagger reverse spinning is selected according to the forming characteristics of the connecting rod bushing and the material characteristics of the tin bronze CuSn8 P forging state.The Deform-3D finite element three-dimensional simulation platform was used to simulate the process of the twisted and reversed forming of the tin bronze CuSn8 P forged joint bushing.The Deform-3D simulation results were measured by Deform-3D's own measurement tool and combined with the least squares method to calculate the diameter expansion,inner diameter tolerance,roundness error and straightness error of the part.The single factor experimental method is used to study the influence of process parameter reduction rate,spindle speed,feed ratio and axial offset on the Stress strain,inner diameter accuracy and shape error.And according to the obtained results and the actual production situation,the thinning rate,the spindle speed and the axial offset are selected as the test factors,and the inner diameter tolerance and the straightness error are used as the optimization indicators.Finally,the orthogonal experiment and Taguchi algorithm are combined to optimize the optimal solution of the main process parameters and process parameters of the tin bronze CuSn8 P forged joint bushing,provided theoretical help for actual production.