Hot stamping of the ultra high strength steel (UHSS) was studied to meet the requirements of lightweight of automobile. The coupled thermo-mechanical model for hot stamping was established with ABAQUS. Initial temperature of tools (die, punch, blank holder) and stamping speed were studied to insure the impact on the thickness, stress and strain of blank. It shows that punch fillet area is easy to crack. With the temperature of tools increasing, the sheet minimum thickness increases first and then decreases. With the increase of punch velocity, the sheet minimum thickness increases. Compared with the initial temperature of tools, punch velocity has a greater impact on the thickness. The simulation results are in agreement with the experimental results and provide a theoretical basis for the practical stamping process.
The warm forming technology is applied to improve the dual phase (DP) steel tailor-welded blanks (TWBs) forming properties. In this paper, the warm deep drawing of DP590 steel TWBs was studied by both the experimental approach and the finite element analysis. The results indicated that the formability of the DP steel TWBs could be reduced slightly at lower temperatures and improved significantly at elevated temperatures. The reasonable punch force and blank holder force decrease rapidly as increasing temperature. Finite element analyses were performed to predict the formability of the warm deep drawing of DP590 steel TWBs and to investigate the rules of the warm deep drawing. The numerical simulation results are in good agreement with experimental results.
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