Prevention method of delayed fracture by cold trim for hot stamped parts

摘要

According to an embodiment of the present invention, there is provided a method of preventing delayed breakage caused in a trim portion of a hot stamped molded component after a cold trim, comprising the steps of: (a) forming a formed body by a hot stamping process; (b) cutting one side of the molded body by a trim process; And (c) applying a current to the trim portion of the formed body to remove residual stress.