Title:
MANUFACTURING METHOD AND MANUFACTURING EQUIPMENT FOR SMALL DIAMETER METAL TUBE
Document Type and Number:
WIPO Patent Application WO/2013/031803
Kind Code:
A1
Abstract:
Small diameter metal tubes are manufactured with good precision and high production efficiency by using a large diameter roll in which rolls having diameters that are clearly larger than the outer diameter of the metal tube being manufactured are disposed. A pair of large diameter side rolls is used, the rolls being designed so that the outer diameter ratio φ2/ φ1 of the outer diameter φ2 of the forming roll to the outer diameter φ1 of the metal tube being manufactured is 10 or more, preferably 25 or more. After forming a metal band into a cylindrical shape in a single stand, the edges of the metal band are brought together and welded. A three roll-type or a four roll-type can be used for the large diameter side roll.
Inventors:
NAKAMURA DAISUKE (JP)
NAKAKO TAKEFUMI (JP)
ASADA HIROSHI (JP)
NAKAKO TAKEFUMI (JP)
ASADA HIROSHI (JP)
Application Number:
PCT/JP2012/071784
Publication Date:
March 07, 2013
Filing Date:
August 29, 2012
Export Citation:
Assignee:
NISSHIN STEEL CO LTD (JP)
NAKAMURA DAISUKE (JP)
NAKAKO TAKEFUMI (JP)
ASADA HIROSHI (JP)
NAKAMURA DAISUKE (JP)
NAKAKO TAKEFUMI (JP)
ASADA HIROSHI (JP)
International Classes:
B21C37/08; B21D5/12
Domestic Patent References:
| WO2007069425A1 | 2007-06-21 |
Foreign References:
| JP2005199293A | 2005-07-28 | |||
| JP2011050986A | 2011-03-17 | |||
| JPH06234020A | 1994-08-23 |
Attorney, Agent or Firm:
NAYA Hiromitsu (JP)
Yohiro Naya (JP)
Yohiro Naya (JP)
Download PDF:
Claims: