| 摘要 |
PURPOSE:To prevent occurrence of distortion in manufacturing beaded panels by restraining a plate with upper and lower dies and compressing the part near both ends of the bead in the final stage of bead forming. CONSTITUTION:A panel 1 is pressed strongly from above and below and restrained firmly using an upper die 7 and a lower die 9 of a press forming machine. Then, a punch 8 is pushed up and a bead is projected in the panel 1. The punch 8 is further pushed up, and both ends of the bead is plastically deformed by both ends of the punch 8 and upper die 7. Thus, tensile stress generated by bead forming is eliminated and occurrence of distortion in the panel 1 is prevented. |
