Simulation about hot stamping of ultra-high strength steel on the basis of lightweight technology

摘要

With the development of automobile lightweight, it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping, which offers the possibility to reduce the weight of automobiles and maintain the safety requirement. In order to complete hot stamping, it is important to design the structure of parts reasonably, which is related with reasonable matching of strength. The objective of this paper is to guide the design of parts manufactured by hot stamping and find the forming technical requirements of vehicle performance. Through experiments, the paper obtains the stress and strain curves at different deformation temperatures and strain rates. Based on experimental data, the constitutive relationship model is established which can reflect the deformation capacity of ultra-high strength steel during the process of hot stamping. Combined with finite element simulation results of hot stamping by commercial soft- ware AUTOFORM, transfer path of load and matching law of strength, the paper determines the design criteria and forming technical requirements of parts manufactured by hot stamping. At the same time, the impact performance of front cross member internal plate is taken into consideration.