CAE Analysis And Optimization Of Steppted Cylindrical Part And Thin-walled Fine Blanking Part

Stamping parts can greatly improve the production efficiency and consistency and have attracted more and more attention by the automobile parts industry.In recent years,stamping parts forming based on Computer Aided Engineering(CAE)analysis has been extensively researched.Through CAE simulation technology,the efficiency of process development can be improved.However,stepped parts such as CVT pistons are extremely prone to stamping failures.This thesis analyzes the forming mechanism and influencing factors of this type of precision stamping parts in detail,and extracts CAE analysis and optimization methods that can ensure the success of stamping of such parts,which has a good reference significance for engineering applications.This thesis first analyzes the structure characteristics of a CVT piston,and arranges the initial stamping process according to the basic theory and specification of stamping process design.Simulation results show that the workpiece is difficult to form and easy to fail.Besides the characteristics of forming materials,it also depends on the control of process parameters and radius of R angle of die.Furthermore,single factor analysis method is used to analyze the blank holder force,the friction coefficient and the R-angle radius of concave convex die which affect the stamping result,and the influence law of each factor on stamping is obtained.According to the main influencing parameters sorted out,under the condition of meeting the forming requirements,taking the maximum wrinkle as the optimization objective,five parameters including blank holder force,friction coefficient,R-angle radius at punch a ’,R-angle radius at die B and Rangle radius at punch C’ are optimized by orthogonal test,and the near optimal solution is finally obtained.The best combination of parameters was compared with the initial process,and it was better optimized.Through the above simulation and optimization process,the CAE analysis and optimization method of this type of high-strength material piston step complex fine blanking process is sorted out.Through the test verification,the fine blanking process obtained by this method can better ensure the stamping effect of high-strength piston and other similar parts,and also can greatly reduce test steps.Springback is an important stamping control parameter.Although it has a weak influence on high strength and thick materials such as CVT piston,it not only affects the forming of thin-walled parts,but also has a key impact on the performance of stamping parts,especially the structural modal performance of thin-walled stamping parts.This thesis analyzes the forming process of the thin-walled heat shield and the possible impact of the springback of the thin-walled stamping.The influence of process parameters,such as blank holder force and friction coefficient,on the forming of thin-walled parts is researched,and the relationship between springback characteristics and modal change is discussed.The ideas and methods to reduce springback by improving the design of stiffeners and increasing the structural stiffness of parts are proposed and verified.