Title:
プレス加工方法およびプレス加工装置
Document Type and Number:
Japanese Patent JP5000256
Kind Code:
B2
Abstract:
To provide a press working method and a press working apparatus by which the occurrence of cracks in the end parts to which stretch-flanging is applied is prevented.
In the press working apparatus, a steel sheet 12 is held with a holder 40 and blank holders 54 and, in the state where blank holding force is applied to the steel sheet, a potion of the steel sheet 12 is press-formed by lowering a fixed upper die 41. Next, in the state where the blank holding force applying to the steel sheet 12 is released by lowering the blank holders 54, a bent part is formed by performing the stretch-flanging of the rest portion of the steel sheet 12 by lowering a second upper die 90.
COPYRIGHT: (C)2008,JPO&INPIT
Inventors:
Yuichi Nagai
Hideo Mawari
Shingo Maeda
Seiji Takahashi
Hideo Mawari
Shingo Maeda
Seiji Takahashi
Application Number:
JP2006282995A
Publication Date:
August 15, 2012
Filing Date:
October 17, 2006
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
B21D22/20; B21D37/08
Domestic Patent References:
| JP63013626A | ||||
| JP9038728A | ||||
| JP10305331A | ||||
| JP3042126A | ||||
| JP63194826A |
Attorney, Agent or Firm:
Masayuki Masabayashi
Ryoichi Takaoka
Hayashi Ichiyoshi
Kiyoshi Kato
Ryoichi Takaoka
Hayashi Ichiyoshi
Kiyoshi Kato