| Application of advanced high strength steel in the automotive manufacturing field is an effective vehicle to achieve light weight and improve vehicle passive safety.Hot stamping is a advanced new technology with specialized manufacture for complex shapes of high-strength steel components, and a very small back spring. Process of this technology is sheet of the temperature rose to a temperature above the recrystallization temperature, and then moved the heated sheet to the mold, forming and quenching, and get the parts with high strength. This process is related to the mold and the sheet metal heat transfer, sheet metal forming and microstructure change, so the process parameters on the rheological behavior of sheet discusses the impact of law, forming part of the hot stamping process of analysis, to develop hot stamping process. Hot stamping technology that will better applied to the actual production is great significance.In this paper, high-strength boron steel Mn22B5 advanced is the research object. Using the experimental research, theoretical analysis and numerical simulation method of combining, high-strength boron steel in the hot stamping process is analyzed based on the physical development of thermal simulation experiment Program, the sheet is fully austenitized, then the temperature dropped to different temperature, different strain rate on the isothermal sheet tensile test obtained the true stress-strain curves. Based on this curves, deformation temperature and strain rate on the rheological behavior of sheet metal and the regularity are analyzed. Based on the experimental results, flow stress model of high-strength boron steel in hot stamping is established.The high strength boron steel U shaped piece of hot stamping process was simulated by finite element numerical simulation. Based on explicit ABAQUS software environment, several key issues, such as sheet metal contact between the treatment and die, determination of material properties and mesh division of finite element software ABAQUS to establish the heat of hot forming parts forming process model. |
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