The Study Of Body Lightweight Method Based On The Forming Of High Steel

Under the constraints of resources and the environment, vehicle takes on more and more social responsibility. Social development determines the vehicle must become more prominent performance in safety, energy conservation and environmental protection to be able continues to assume an important role in the future. Lightweight technology is an effective way to meet the above three regulations. High strength steel could have both lightweight and crash safety. In this paper, high-strength sheet steel is studied, the main work is as follows:1)Taking the typical thermoforming parts B-pillar reinforcement as a example,numerical simulation method for thermal forming process was studied. By heat- power phase change – coupled, the distribution of temperature and stress field were overviewed. The temperature distribution meets the martensitic transition temperature, to determine the reliability of the hot forming simulation. After forming, part tensile strength is 1452 MPa and hardness is 478 HV. Sheet was summarized for the initial heating temperature, punching speed to the temperature field and stress field distribution formed after the end of forming. The hot forming simulation process parameters of the B-pillar reinforcement plate are initial heating temperature of 850 ?, pressing speed of 200mm/s.2)Taking high-strength steel of forming as a example, Forming history to crash performance was studied. The forming parameters of car stringer board were carried out by using the experimental design optimization solution methods and genetic algorithm By using result mapper tool, the result of forming simulation is mapped to the collision to collision and force and energy absorption value impact of crash simulation were evaluated. The results showed that: Considering the history of stamping and forming without considering withdrawing historical errors can reach 11.7%.3)Taking part of hot forming as a example, Variable strength hot stamping of crashworthiness was researched. The stringer structures of different combinations of materials was studied. By comparing the peak impact force and energy absorption values after the collision, the energy absorption value that the impact force at the peak rate of increase is not the case increased 47.8%. Compared to conventional set to increase by inducing grooves energy absorption effect, variable intensity of hot forming has obvious advantages. Taking the intensity of the B-pillar for the study, side impact model through simplifying the model, with the introduction of a similar vehicle boundary conditions is improved the reliability of the model. By reducing thickness of the variable intensity of the B-pillar, with the original model compared, the results show that the operating conditions, the amount of intrusive and invasive speed has improved in the side impact,and the mass of variable intensity of the B-pillar reduced the mass of 0.92 Kg.