Numerical Simulation on Hot Forming of B Pillar

摘要

Hot forming of boron alloyed steel is used increasingly to reduce the weight of an automobile and enhance its safety. The thermo-mechanical coupling method is employed in this paper to establish hot forming FE model of B Pillar and obtain the thickness and temperature distributions of blank. The results showed that the minimum thickness of sections lied in the corner of big ending. The experimental and simulative values of thickness were 1.68 mm and 1.51 mm respectively. The error was about 10%. The blank holder and the punch round contacted with the blank firstly and therefore these areas of blank got lower temperature, while the blank near the jugular area of big ending had higher temperature for its large deformation. The cracking area of simulation lied in the jugular area of big ending which coincided with the necking area of experiment. As a result, numerical simulation is verified to be feasible compared with the experimental results for the hot forming.