Simulation Study On Hot Stamping Of B-pillar Reinforced Plate

The B-pillar reinforcement plate is an important part of supporting the body and protecting the occupant’s safety.High-strength steel B-pillar reinforcement plate not only can achieve the lightweight of the body,but also can improve the safety of the collision of the vehicle.Hot stamping technology is an effective method for manufacturing high strength B-pillar reinforcement plate.In this paper,the technical principle of hot stamping and the research status at home and abroad are introduced,and the development history and classification of high strength steel are introduced.Secondly,the mechanism of metal softening in the process of sheet metal and the process of phase transition of high strength steel during hot stamping is introduced,the process of heat transfer in hot stamping is introduced.Finally,the process of thermo-mechanical coupling is discussed.According to the characteristics of hot stamping,the mold of B-pillar reinforced plate is designed,and the finite element model of B-pillar reinforcement plate is established.Based on ABAQUS,the temperature field and stress field distribution of B-pillar reinforcement plate after stamping are analyzed by numerical simulation.A single variable method and numerical simulation are used to analyze the influence of the initial forming temperature of blank,the initial temperature of the die and the punching speed on the hot stamping forming of B-pillar in hot stamping stage.By using the orthogonal experiment design and numerical simulation,the paper studies the significant influence factors on the hot stamping process of B-pillar reinforcement plate,and uses the method of extreme difference analysis to determine the initial temperature of die,the initial forming temperature of blank,the stamping speed and the friction coefficient of the stamping stage.At the end of hot formed,the temperature field of B-pillar reinforcement plate and mood is used as the initial temperature field in quenching process,the heat flux-solid coupling numerical simulation of the quenching process of B-pillar reinforcement is carried out,and the effect of different flow velocity and different holding time on the quenching effect of B-pillar reinforcement plate is studied,and the flow velocity and holding time of the quenching stage is determined.