| 发明名称 |
METHOD OF MANUFACTURING RECTANGULAR TUBE HAVING STEPPED PORTION |
| 摘要 |
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. |
| 申请公布号 |
US2015273548(A1) |
申请公布日期 |
2015.10.01 |
| 申请号 |
US201414229440 |
申请日期 |
2014.03.28 |
| 申请人 |
TANOUE Ryuji;SASAKI Hirokazu;NAKAMURA Naofumi;KUROBE Jun |
发明人 |
TANOUE Ryuji;SASAKI Hirokazu;NAKAMURA Naofumi;KUROBE Jun |
| 分类号 |
B21B17/08;B21B27/02 |
主分类号 |
B21B17/08 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. 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. |
| 地址 |
Sakai JP |
