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Title:
段差付き角パイプの製造方法
Document Type and Number:
Japanese Patent JP5839389
Kind Code:
B2
Abstract:
A method of manufacturing a rectangular tube having a stepped portion includes: forming V-shaped grooves on a rectangular tube at surfaces of an end thereof in a direction parallel to a longitudinal direction thereof; and pressing each of the surfaces having the V-shaped grooves formed thereon with a rotating roll from outside to inside, whereby the end of the rectangular tube is radially reduced.

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Inventors:
Ryuji Tagami
Hirokazu Sasaki
Naofumi Nakamura
Atsushi Kurobe
Application Number:
JP2011217072A
Publication Date:
January 06, 2016
Filing Date:
September 30, 2011
Export Citation:
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Assignee:
Nisshin Steel Co., Ltd.
International Classes:
B21D51/16; B21D41/04
Domestic Patent References:
JP2001522310A
JP58187224A
JP6019938U
JP49006037B1
JP3359947B2
Foreign References:
US2055771
Attorney, Agent or Firm:
Okada Manri



 
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