| dc.description.abstract | In recent years, the awareness of global environmental protection.In order to cut greenhouse gas emissions, increase the fuel efficiency of gasoline. Losing weight of automobile is the goal of each automotive company in the world. Carbon emissions becomes major environmental index for each country in the world. Thus increased usage of advanced high strength steel. However, there is dual phase steel is the most used material.
In the production process of vehicle parts, there will be a phenomenon that the material will have a springback effect, this is also the problem that the automotive industry currently encounters in the production of advanced high strength steel, especially in the accuracy of forming the part size. However, in stamping forming, springback is an unavoidable problem, and as the strength of the material used is higher, the springback phenomenon becomes more serious, so this study uses three-point sheet bending, U-bending and V-bending forming experiments to understand the characteristics of springback.After all, we choose four materials of 1mm thickness thin-plate dual-phase steel DP590, dual-phase steel DP780, dual-phase steel DP980, and dual-phase steel DP1180.
In this study, hydraulic presses and crank presses were used to discuss the forming characteristics of advanced high strength steel under different strain rate and the relationship between different strain rate and plate breakage. We hope to discuss the possibility, whether to use different die size and die characteristics to suppressing the of springback. And using the finite element method software to simulate advanced high strength steel springback to verify the correctness of CAE simulated springback. In order to improve the accuracy of CAE simulation springback, this study will explore the relationship between the degree of same
strain and springback angle, and then apply it to the basic analysis of CAE simulation analysis technology of stamping forming, including V-shaped bending, three-point sheet bending and U-shaped bend.
The dual-phase steel will be strengthened due to the phase transformation when the material is deformed. In this study, the springback angle of the dual-phase steel during sheet forming and the effect of changing the process parameters on the springback angle are analyzed for this strengthening phenomenon. | en_US |