Research On Stamping Process Parameters Of Reinforcing Plate In Automobile Side Sill

The automobile reinforcing plate is the most important part to ensure the safety performance of the vehicle.In the case of unavoidable collision accident,it can strengthen the vehicle as a whole,and effectively absorb and attenuate the impact energy of vehicle collision.Its quality directly affects the safety performance of the vehicle quality.Therefore,in the sheet forming process,not only the material properties of the sheet itself should be considered,but also the relevant process parameters should be set reasonably.In this paper,the reinforcing plate in the side bottom beam of a certain type of vehicle was taken as the research object.Based on the sheet metal forming mechanics theory and the finite element numerical simulation theory technology,the main factors of defects in the sheet metal forming process were studied.Through the professional finite element numerical simulation software Dynaform,the four process parameters that affect the forming quality of sheet metal: blank holder force,punching speed,friction coefficient,and concave-convex die clearance were numerically analyzed.The main research contents were as follows:1.Based on the application of mechanics theory in sheet metal forming,the main causes of defects in sheet metal forming process were studied,and the yield condition,sheet shell theory and boundary problems were discussed through the finite element theory and technology.2.Through the professional analysis of sheet metal forming finite element numerical simulation software Dynaform,the numerical simulation analysis of the reinforcing plate in the side bottom beam of the automobile was carried out,and the stress distribution diagram,strain distribution diagram,thickness distribution diagram and forming limit(FLD)diagram after sheet metal forming were obtained.And the defects of tension and wrinkling after sheet metal forming were observed,not only the parts that were prone to defects were predicted,but also the main causes of defects were analyzed.3.Dynaform software was used to make a deep study on the single variable parameters of four technological parameters that affect the sheet metal forming quality: blank holder force,punching speed,friction coefficient,and concave-convex die clearance.Based on the minimum thickness and forming status of the sheet as the determination index,the relevant rules of the influence of each process parameter on the forming quality of sheet metal and the better range of forming quality were obtained.4.Through the orthogonal test design scheme of the reinforcing plate in the side bottom beam of the automobile,the minimum thickness was taken as the test index,and the four process parameters affecting the sheet metal forming quality were sequenced by the orthogonal test range analysis method,and the optimal process parameter combination was also obtained.The variance analysis method was used to verify the conclusions of the range analysis method,which increased the reliability of the conclusions.5.Through numerical simulation analysis of the optimal process parameters,it can be seen from the forming limit(FLD)diagram that the crack and wrinkling defects after the sheet metal forming were obviously improved compared with the forming results before the optimization,and the accuracy of the results after the optimization and the reliability of the scheme design were fully explained again.