Numerical Simulation And Experimental Study On The Forming Of Hot Spinning Cu-Sn Alloy Cylinder

Cu-Sn alloy cylinders have good bearing characteristics and are widely used in heavy-duty diesel engines at home and abroad.They are usually formed by power spinning process at room temperature.However,with the continuous development of spinning technology,the surface defects of the Cu-Sn cylinder formed by room-temperature spinning always appear inevitably,which greatly reduces the forming accuracy and extends the production cycle,resulting in a serious waste of human and material resources.This paper proposed to use the hot spinning technology for Cu-Sn alloy cylinder forming.Hot power spinning technology is a spinning forming under the heating state,using a certain spinning temperature to reduce the deformation resistance of the material,improve the uniformity of the organization,and with a certain amount of deformation to improve the metal forming quality,in order to ensure the stability of the material forming at the same time to improve the mechanical properties.In view of the fact that there are few reports on the thermal spin of Cu-Sn alloy at home and abroad,it is of great significance to explore the process of hot power spinning Cu-Sn cylinders for the preparation of high-quality Cu-Sn alloy cylinders.In this paper,Cu-Sn alloy cylinders were taken as the research object.By means of numerical simulation and test,combined with a variety of analysis methods,the influences of hot power spinning process parameters on the forming accuracy,microstructure and properties of the spun parts were studied,and the thermal spinning process for the preparation of high-precision and high-property Cu-Sn tubular parts was explored.The main work is as follows:Under constant simulation conditions,four process parameters,including thinning rate,spinning temperature,feed ratio and mandrel preheating temperature,were selected as variables.An orthogonal test was designed,and a single-pass hot spinning simulation was carried out on Cu-Sn alloy cylinders with the help of numerical simulation software Simufact.Secondly,based on the simulation results,combining with range analysis and grey correlation method,the influence law and significance sequence of each parameter on the forming accuracy were studied.And the single-pass hot spinning process parameters of Cu-Sn alloy cylinders were optimized.Then the optimized parameters were simulated,and the feasibility of hot spinning Cu-Sn alloy cylinders and the reliability of the simulation model and the two analysis methods were verified by experiments,which laid a foundation for further research.Taking the optimized data as reference,the hot spinning passes were adjusted,the annealing process was introduced,the hot spinning test scheme was developed,and two hot spinning tests were carried out on the extruded Cu-Sn alloy cylinders.The influences of the total thinning rate,spinning temperature and annealing process on the microstructure and properties of the formed parts were studied by microstructure characterization and mechanical property test.Finally,the process parameters of preparing high-property Cu-Sn alloy cylinders by two-pass thermal spinning were obtained by comprehensive scoring method,which met the comprehensive quality requirements of bearing parts in engineering and provided theoretical guidance for practical production.It has a significant utility value in engineering.