Study On Stamping Formability And Impact Performance Of Automotive Sheet Metal Parts Of QP980 Ultra High Strength Steel

Ultrahigh-strength steel is one of the ways to reduce the weight of automobiles,and it is increasingly used in automotive bodywork sheet metal parts.The application of ultrahigh-strength steels has been increasingly valued by automakers.The content studied in this paper is originated from the super high strength steel QP980 application project in China.Through the simulation analysis and test combination method,the QP980 ultra high strength steel automotive sheet metal parts were studied for stamping forming performance and impact performance.The main research contents of this article are as follows:(1)The QP980 ultrahigh-strength steel flange performance was studied,and the mechanical properties of the QP980 material were obtained through tensile tests.On this basis,the flange collision protection was designed for the door impact beam as a target.It lays the foundation for subsequent simulation analysis.(2)Preliminarily determine the forming parameters through empirical formulas,and perform the forming simulation in the AutoForm software to obtain the data of the maximum thinning rate and springback amount,analyze the problem of the door anti-collision beam flange forming,and use the response surface method to shape the forming parameters.Optimized design.Finally,the test flow was designed and verified by actual tests.(3)To study the drawing performance of QP980 ultra-high strength steel,the A-pillar reinforcement plate was used as the object,its structural characteristics were analyzed,and combined with QP980 material properties,the drawing forming process was designed.Through empirical formulas,the forming parameters such as plate thickness and friction coefficient are preliminarily determined.The wrinkling parameters,maximum thinning rate,and material indentation data are obtained through forming simulation.The influence of different blank holder forces on the forming quality is studied.Different BHF forming tests were designed and practically verified.(4)The collision performance of QP980 super high strength steel was studied.Based on the vehicle door CAD model,the finite element model of the vehicle door and thedoor collision model were established.Through the crash simulation analysis,the involute curve and the acceleration change curve of the door were obtained,and the material was studied based on the curve data.Impact on crash performance.