PRESS MOLDING AND ITS HIGH FREQUENCY QUENCHING METHOD AND ITS HIGH FREQUENCY QUENCHING SYSTEM

摘要

A press molding, e.g. a center pillar for vehicle, having a required strengt h distribution imparted by quenching, e.g. induction quenching, and induction quenching method and system for press molding. A press molding, i.e. a cente r pillar (10), comprises an intermediate top part (11) extending in the longitudinal direction thereof, and two side wing parts (12) bent to the sam e side from the opposite sides of the intermediate top part (11), wherein a quenching region (Q) is provided on the opposite sides of the intermediate t op part (11) while spreading over the intermediate top part (11) and the side wing parts (12). Since the region (Q) being quenched by a induction quenchin g system enlarges gradually and continuously from the upper part to the lower part of the center pillar (10), the ratio between quenching region and non- quenching region is varied in the longitudinal direction of the center pilla r (10) thus ensuring a required strength distribution.