Title:
ROLL FORMING METHOD AND FORMING DEVICE OF RECTANGULAR PIPE
Document Type and Number:
WIPO Patent Application WO/2007/129387
Kind Code:
A1
Abstract:
A method for producing a rectangular pipe being highly precise in dimension and profile and excellent in internal quality while doubling as a roll by roll-forming a circular pipe into a rectangular pipe without imposing undue burden on those parts of a blank pipe becoming the corner portions and the shoulder portions. Curvature of the surface of a major forming roll in the direction of the axis of rotation is arranged such that linearization of a blank pipe portion (part for a shoulder portion) adjacent to a part for the corner portion of the rectangular pipe precedes other blank pipe parts (other parts for side portions). For example, stands of four-way roll configuration are employed as the uppermost-stream and lowermost-stream forming roll stands, vertical and lateral main forming roll stands of two-way roll configuration are arranged in-between, and a support roll only abutting in the direction intersecting the pair of two-way main forming rolls perpendicularly is disposed in-between, thus balancing the doubling effect as a roll and the facility costs optimally to allow low-cost production.
Inventors:
WANG FEIZHOU (JP)
NAKANO TOMOYASU (JP)
KIUCHI MANABU (JP)
NAKANO TOMOYASU (JP)
KIUCHI MANABU (JP)
Application Number:
PCT/JP2006/309103
Publication Date:
November 15, 2007
Filing Date:
May 01, 2006
Export Citation:
Assignee:
NAKATA MFG CO LTD (JP)
WANG FEIZHOU (JP)
NAKANO TOMOYASU (JP)
KIUCHI MANABU (JP)
WANG FEIZHOU (JP)
NAKANO TOMOYASU (JP)
KIUCHI MANABU (JP)
International Classes:
B21C37/15
Foreign References:
| JPS6137321A | 1986-02-22 | |||
| JPS61115614A | 1986-06-03 |
Attorney, Agent or Firm:
IKEJYO, Shigenobu (ShibakawaBldg.3-3, Fushimimachi 3-chome,Chuou-ku, Osaka-sh, Osaka 44, JP)
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