2008 年 49 巻 567 号 p. 321-325
For the past decade, hot stamping technology has been gradually applied to the production of super high strength automotive parts. Although auto-parts such as bumpers, door impact beams, center pillar reinforces have been produced by hot stamping and installed in many cars all over the world, this promising technology has not spread as much as was expected. One of the major reasons is the high production costs owing to the low productivity of this technology. In this study, we investigate the effect of forming conditions on the shape fixability of hot stamped hat-type parts. On the basis of the obtained results, we introduce a new hot-stamping technology characterized by a markedly high productivity.