A Study on the Effect of Process and Material Variables on the Hot Stamping Formability of Automotive Body Parts

Hot stamping is a method capable of manufacturing high-strength automotive body parts by inducing martensitic phase transformation through forming and die quenching after heating metal sheet into high temperature austenite phase. However, it not easy to solve various formability problems occurring in the hot process due complexity material behavior during forming. In this study, fracture-related limits martensite ratio were selected as criteria for evaluating formability. First, test was performed on T-type part that simplified B-pillar, an part, fracture according thickness blank investigated. Additionally, analysis mass-produced B-pillar varying blank, die-blank friction coefficient, strain-rate sensitivity among variables. Based results, effect each variable quantitatively analyzed. By utilizing results will be possible problem occurs mass-production improve quality future.