Research On Key Technologies Of Near-net-shape Forming Process For Overrunning Clutch Outer Ring

Overrunning clutch is the key part of the driving system of the automobile starter.The part is required to have high carrying capacity and shock resistance due to its complex working conditions.The requirements for the precision and quality of the part have been improved in recent years with the rapid development of the automobile industry.The traditional manufacturing process of the overrunning clutch outer ring is unable to meet the requirements of the enterprise and the market.As one of the near net forming processing methods,cold forging has the advantages of high production efficiency,high material rate and good organization structure.Therefore,it is of great practical significance to study the cold forging process of this part.In this paper,the outer ring of the overrunning clutch in a motor vehicle is studied.The key technology of the near-net-shape forming technology for the outer ring of the overrunning clutch is developed in view of the deficiency of existing forming technology.The main research contents are as follows:Firstly,Structure optimization and process design of overrunning clutch outer ring.Starting from the uses and structural characteristics of the overrunning clutch,the structure is optimized based on working conditions.The reliability of the optimized structure is verified by finite element software.At the same time,a new spiral internal spline rotary extrusion processing method has been developed according to the structural characteristics of the outer ring.The forming process design of the parts is completed,based on this method.Secondly,the forming process of the parts is simulated by finite element software,and the stress field,velocity field and travel load condition during the forming process are analyzed.Through the orthogonal test,the influence of the main process parameters on the forming load is studied,and the influence degree of the process parameters on the forming load is compared.Moreover,the process parameters of the forming process are preliminarily determined.Thirdly,the wear of punch is simulated based on finite element software.The wear section and temperature field of the punch are analyzed.Taking the maximum wear volume of punches as optimization objects,a response surface optimization experiment with three factors is designed.The response surface relationship model between main influence parameters and punch wear is plotted based on the test results.The process parameters of the parts forming are final y determined according to the production cost,the difficulty of the punch processing and the optimum combination of the parameters determined by the orthogonal test method and the response surface method.Finally,the forming die in each process is designed according to the forming process of the parts,and the type of hydraulic press is selected for processing the part.The samples of the parts and the wear of the punch after the experiment were compared with the numerical simulation results.The results show that the numerical simulation results are accurate.