Title:
金属曲げ管の矯正方法および矯正用プレス金型
Document Type and Number:
Japanese Patent JP4687890
Kind Code:
B2
Abstract:
The forming recesses (1, 3) of a lower die (2) and an upper die (4) are formed to have a semi-oval profile so as to provide a forming space S almost oval in section with the dies closed. The parting line L between the lower die (2) and the upper die (4) is deviated as much as h from the major axis b of the forming space S toward the upper die (4) side, and the opening width of the forming recess (1) of the lower die (2) is set to be slightly larger than the opening width of the forming recess (3) of the upper die (4). A metal bent tube is plastic-deformed into an almost oval shape in section by closing the dies while being compressed in a peripheral direction by the lower and upper dies (2,4) to eliminate spring-back caused by bending, whereby the buckling and pinching toward the outer side of the tube wall is prevented by the expanded portion (2a) of the lower die (2) and buckling toward the inner side of the tube wall is prevented by a step difference formed by the difference in opening width between the lower die (2) and the upper die (4).
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Inventors:
Takeshi Umeda
Yoshiaki Kadoma
Yoshiaki Kadoma
Application Number:
JP2005314919A
Publication Date:
May 25, 2011
Filing Date:
October 28, 2005
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
B21D3/10
Domestic Patent References:
| JP6440121A | ||||
| JP2003182385A | ||||
| JP479727B2 | ||||
| JP3593381B2 | ||||
| JP3642244B2 | ||||
| JP200581393A |
Attorney, Agent or Firm:
Calyx
Miyazaki Yoshio
Kaoru Onozuka
Akio Tagami
High Masahiro
Toshio Nakamura
Miyazaki Yoshio
Kaoru Onozuka
Akio Tagami
High Masahiro
Toshio Nakamura