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US 2015/0273548 A1Published application
Method of manufacturing rectangular tube having stepped portion
AssigneeNisshin Steel Co., Ltd.
InventorsRyuji TANOUE, Hirokazu SASAKI, Naofumi NAKAMURA, Jun KUROBE
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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.
Claims4
A method of manufacturing a rectangular tube having a stepped portion comprising:
- 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.
Dependencies are inferred from the claim text.