The demands of applications of high strength steel in car body are getting greater and greater. In order to reduce defects

such as fracture

wrinkle

spring-back

and so on

the hot forming process was introduced

which could improve the plasticity of high strength steel and ensure the strength of the parts. Taking the B column of 22 Mn B5 as an example

numerical simulation of the hot forming process is carried out. The method of setting forming temperature

initial temperature of mold

blank holder force and punching speed was adopted to determine the optimum process parameters of automobile B pillar under the hot forming process. Compared the results of simulation under the hot forming process with that under the cold forming process

this paper got the superiority of the hot forming process finally.