Author(s)

Weixin Xing, Bingtao Tang, and Jiyuan Liu, Ning Guo

Corresponding Author

Weixin Xing

ABSTRACT

At present, the traditional high-strength hot stamping parts cannot play the role of buffering energy absorption due to insufficient ductility, and cannot meet the current requirements of automotive safety. By heating the hot stamping die and changing the cooling rate, the hot forming parts with gradient performance are obtained. It is a new hot stamping process based on the traditional hot stamping process. In this paper, the B-pillar is used as the research object, and the Ls-dyna simulation software is used to optimize the hot-stamping parameters of the B-pillar gradient performance based on the mode Frontier optimization platform. The temperatures of upper and lower die, sheet initial temperature, and dwell time are input as process variables, and the final temperature of hot stamped component, sheet thickness, and thinning rate are selected to be objective functions to obtain more accurate process parameters. It is suggested that the initial temperature of sheet metal is 930℃, the temperature of heated upper and lower die is 500℃, the temperature of the unheated lower and upper die is 30℃, and the dwell time is 20s. Finally, the optimized process parameters are used to simulate the tailored tempering process of B-pillar to verify its feasibility.

KEYWORDS

Hot stamping, tailored tempering process, tensile strength, ductility, gradient performance