Probability assessment of mechanical trimming using hot half-trimming in hot stamping process

¹ Graduate School of Convergence Science, Pusan National University, South Korea
² PNU-IFAM Joint Research Center, Pusan National University, South Korea
³ School of Mechanical Engineering, Pusan National University, South Korea

^a Corresponding author: e-mail: dcko@pusan.ac.kr

Abstract

The objective of this study is to investigate the probability of mechanical trimming using hot half-trimming in actual hot stamping process. Hot half-trimmed part can be inaccurately positioned on mechanical trimming die by relatively low accuracy of automatic transferring system or manual way, leading to the change of clearance in mechanical trimming. Taking into account this position error, a suitable operation window for trimming of flat and inclined part was constructed by FE-simulation and then was verified by experiment. It was determined from the operation window that effective mechanical trimming for both flat and inclined part can be performed successfully with hot half-trimming depth of 1.0 mm in hot half-trimming and clearance between 0.1 mm and 0.124 mm in subsequent mechanical trimming, without regard to position error.