LARGE STRAIN INTRODUCING WORKING METHOD AND CALIBER ROLLING DEVICE

Title:

LARGE STRAIN INTRODUCING WORKING METHOD AND CALIBER ROLLING DEVICE

Document Type and Number:

WIPO Patent Application WO/2004/103591

Kind Code:

A1

Abstract:

A method of rolling with a flat-shaped hole die in a 1st pass and subsequently rolling with a square-shaped hole die in a 2nd pass in a hole die rolling of two or more continuous passes. The rolling is performed with a caliber which sets the ratio of the minor axis (2A₀₁) of a 1st pass flat to a material opposite side dimension (2A₀) to A₀₁/A₀ ≤ 0.75 and the ratio of a 2nd pass vertical diagonal dimension 2A_s1 to the major axis 2B₁ of a material after the 1st pass to A_s1/B₁ ≤ 0.75 to introduce the large strain into the material. Thus, the effect of the distribution of strain introduced into the material in the 1st pass on the distribution of strain and the shape of the next pass is made clear so that the large strain can be introduced into the entire cross sectional area of the material, particularly at the center of the material.

Inventors:

INOUE TADANOBU (JP)
TORIZUKA SHIRO (JP)
MURAMATSU EIJIRO (JP)
NAGAI KOTOBU (JP)

Application Number:

PCT/JP2004/007279

Publication Date:

December 02, 2004

Filing Date:

May 20, 2004

Export Citation:

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Assignee:

NAT INST FOR MATERIALS SCIENCE (JP)
INOUE TADANOBU (JP)
TORIZUKA SHIRO (JP)
MURAMATSU EIJIRO (JP)
NAGAI KOTOBU (JP)

International Classes:

B21B1/18; B21B27/02; B21B1/16; (IPC1-7): B21B1/16; B21B27/02

Foreign References:

JPH01181939A	1989-07-19
JPS62174703U	1987-11-06
JPS5575801A	1980-06-07

Other References: