Hot stamping method and mold device for forming and trimming of blank

摘要

The present invention relates to a hot stamping method and a hot stamping mold device and, more specifically, a hot stamping method for molding and trimming a blank at a time and a hot stamping mold device. The hot stamping mold device according to the present invention comprises a lower mold coming in close contact with a heated molded part of a blank and having a first cooling surface cooling the mold part; an upper mold which moves between a first position close to the lower mold and a second position away from the lower mold, and which is provided with a second cooling surface facing the first cooling surface and, together with the first cooling surface, presses and cools the mold part of the blank; and a punch which is installed on the circumference of the second cooling surface and which moves between a third position applying shearing stress to the blank to cut a boundary between the molded and trimmed parts of the blank and a fourth position away from the blank. The hot stamping method according to the present invention is provided to perform molding and trimming works at a time, thereby reducing processing costs and time, and to reduce the hardness of a trimmed part, thereby extending a service life of a punch used to trim and obtaining a clean cut.