Hot pressing process is a complicated sheet forming process. In hot pressing process, sheet forming operation is conducted at high temperatures (about 800 to 900 ° C). Forming at high temperatures reduces stresses and with less energy consumption however reating conditions of indie quenching causing the material to become hardened after forming operation. In hot pressing, a hot sheet is placed inside the die and formed and cooled from beginning to end of process. Using hot pressing process, components can be produced with optimized performance against sudden shocks and distortions, such as vehicle crash. This technology can produce structures with high strength, where good energy absorbers are entered into the system. One of the main applications of this process is the production of sensitive components in a vehicle crash. In the present work, the main goal is to obtain main guide lines of hot stamping die design for production of B-pillar. In the hot stamping process, the operation is performed based on controlling the material microstructure. Microstructure percentage of material determines its mechanical properties. To obtain a specific microstructures is performed by controlling the material cooling rate. Material microstructure depends on phase transformation and cooling rates which are very sensitive to the material used for such a process. In this study Boron alloy steels is used which has the characteristic of better control over its phase transformation during the process. In the hot Stamping process, phase control is conducted by controlling the cooling rate of part inside the die. In this project, a thermo-mechanical finite element simulation is performed with ABAQUS software to find the optimum parameters affecting the component mechanical properties, in order to achieve desired conditions. The results of the simulations show that the most effective parameters in controlling cooling rates are pressure contact between the sheet and die and initial temperature of die. To control the contact pressure, three types of die were introduced and their advantages and disadvantages are expressed and finally the best die type is specified in terms of its feasibility and efficiency in order to reach the desired microstructure more accurately. Keywords: Hot Stamping - Phase transformation – indie quenching– Boron steel - Finite element simulation.
