Title:
BEAD FORMING METHOD
Document Type and Number:
Japanese Patent JPS5933034
Kind Code:
A
Abstract:
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.
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Inventors:
FUKUYORI KAZUNARI
Application Number:
JP14111082A
Publication Date:
February 22, 1984
Filing Date:
August 16, 1982
Export Citation:
Assignee:
HITACHI LTD
International Classes:
B21D17/02; (IPC1-7): B21D17/02
Domestic Patent References:
| JPS5284158A | 1977-07-13 |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)