FORMING METHOD AND FORMING DEVICE

Title:

FORMING METHOD AND FORMING DEVICE

Document Type and Number:

WIPO Patent Application WO/2012/060116

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a forming method and a device which are capable of manufacturing a high quality product with high dimensional accuracy by performing a required forming with less additional strain given to a material to be formed without impairing the productivity of a conventional roll forming in forming a round steel pipe, for example. To attain the purpose, in the present invention, in an initial breakdown process, a turning unit having the structure in which a die line using dies having a forming groove which is swingably formed outward turns and moves on an endless track is employed, the dies are turned and moved while being changed to a required angle by locking an edge portion of the material to be formed with the forming groove of the die to attain bending forming, and thus it is possible to remarkably reduce various problems due to a wrapping phenomenon and a high contact stress locally generated by the roll formed.

Inventors:

WANG FEIZHOU (JP)
NAKANO TOMOYASU (JP)
INOKUMA AKINORI (JP)
YIN JILONG (JP)
AKAI TERUTOMO (JP)

Application Number:

PCT/JP2011/054176

Publication Date:

May 10, 2012

Filing Date:

February 24, 2011

Export Citation:

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Assignee:

NAKATA MFG CO LTD (JP)
WANG FEIZHOU (JP)
NAKANO TOMOYASU (JP)
INOKUMA AKINORI (JP)
YIN JILONG (JP)
AKAI TERUTOMO (JP)

International Classes:

B21D5/10

Domestic Patent References:

WO2009110372A1	2009-09-11
WO2009110372A1	2009-09-11

Foreign References:

US3145758A	1964-08-25
JP2000061535A	2000-02-29
JPS62114729A	1987-05-26
JPH07275953A	1995-10-24
US1980308A	1934-11-13
US3145758A	1964-08-25
JPS5551648B2	1980-12-25

Other References: