Hot Stamping Forming Process And Finite Element Simulation Of USIBOR1500 High-strength Steel

High-strength steel hot stamping technology is an important way of vehicle lightweight and energy saving.high-strength steel is heated to about 900 ℃,and then formed by hot stamping die,control the quality of forming parts is a technical problem in the process of forming.The subject obtained USIBOR1500 high-strength steel flow stress curve by high-temperature tensile test,and fit the material high temperature constitutive model by least-squares method and origin software.Based on M-K theory,the FLD theoretical model of USIBOR1500 high-strength steel was deduced.The FLC curve of USIBOR1500 high-strength steel was drawn by DYNAFORM software by empirical method.Direct hot forming and indirect hot forming were compared.Based on the DYNAFORM simulation software,the two forming processes were simulated and the curves of the blank holder force and the forming force were obtained.Finalized the best process plan.The simple structure of the parts using direct hot stamping technology,the sheet through the electric furnace heated to above 900 ℃,the initial tool temperature of 100 ℃,stamping speed of 50 mm / s,blank holder force of 1.28 kN,punching force of 19.8kN.The structure of the more complex parts using indirect hot stamping technology.The mathematical model for predicting the martensitic transformation is given by theoretical derivation,and the kinetic curve and CCT curve are plotted.Using the DYNAFORM,taking the automotive anti-collision beam as an example,The process of quenching and transformation during stamping process was simulated.The factors affecting the formation of martensite in hot stamping process were analyzed.The martensitic transformation law was obtained.By using Hypermesh software to extract the middle plane of the three-dimensional model of the anti-collision beam,the collision simulation of the anti-collision beam designed in this paper was carried out based on ABAQUS.Finally,it was verified that the anti-collision beam designed in this paper has a good energy absorption effect.