Title:
通孔を有する金属製部材の製造方法
Document Type and Number:
Japanese Patent JP4879596
Kind Code:
B2
Abstract:
A structure and method is realized for stably and at low cost carrying out an operation for forming a through hole 5c at one portion of a side wall 14 of an expanded portion 7a made by plastically deforming one part of a metal tube 3 radially outward, in a portion where the plate thickness gradually changes. A slide tool 13b is withdrawn from inside a punch hole 12 while applying hydraulic pressure to the inside of the side wall 14. Regarding a tip end face 20a of the slide tool 13b, a portion facing the portion of the side wall 14 where the plate thickness is relatively thick is recessed. Due to this construction, at the instant of commencing withdrawal of the slide tool 13b, the degree of progress in the shearing for the portions of the side wall 14 matching with the two side edges of the punch hole 12a is made different. Then the timing for moving from shearing to rupture is made to coincide, so that of the side wall 14, the portions matching with the punch hole 12a, are made reliably into a blank 10c, and are extracted from the side wall 14.
Inventors:
Shoichi Abe
Yasushi Watanabe
Kazumi Shimame
Atsushi Tomizawa
Mitsutoshi Uchida
Yasushi Watanabe
Kazumi Shimame
Atsushi Tomizawa
Mitsutoshi Uchida
Application Number:
JP2006025296A
Publication Date:
February 22, 2012
Filing Date:
February 02, 2006
Export Citation:
Assignee:
Nippon Seiko Co., Ltd.
nsk Steering Systems Co., Ltd.
SUMITOMO METAL INDUSTRIES,LTD.
Sumitomo Steel Pipe Co., Ltd.
nsk Steering Systems Co., Ltd.
SUMITOMO METAL INDUSTRIES,LTD.
Sumitomo Steel Pipe Co., Ltd.
International Classes:
B21D26/035; B21D26/033; B21D28/28; B21D53/88
Domestic Patent References:
| JP2004203133A | ||||
| JP200498069A | ||||
| JP2000280032A | ||||
| JP2001246430A |
Attorney, Agent or Firm:
Takeo Koyama
Nakai Shun
Kinzo Koyama
Nakai Shun
Kinzo Koyama