DIE FOR IRONING PROCESS, AND SHAPED MATERIAL PRODUCTION METHOD

Title:

DIE FOR IRONING PROCESS, AND SHAPED MATERIAL PRODUCTION METHOD

Document Type and Number:

WIPO Patent Application WO/2015/111233

Kind Code:

A1

Abstract:

　A die for an ironing process according to the present invention is provided with a punch, and with a die that defines a molding aperture in relation to the punch. When the skewness (Rsk) of a surface-treated metal plate is less than -0.6 and at least -1.3, the curvature radius of the die shoulder, and the clearance between the punch and the R tangent, are determined such that Y, which is represented by {(tre-cre)/tre} × 100, and X, which is represented by r/tre, satisfy the relationship 0 < Y ≦ 18.7X – 6.1; X satisfies the relationship X ≧ 0.6; and r satisfies the relationship r ≦ 0.5h.

Inventors:

NAKAMURA NAOFUMI (JP)
YAMAMOTO YUDAI (JP)
KUROBE JUN (JP)

Application Number:

PCT/JP2014/060704

Publication Date:

July 30, 2015

Filing Date:

April 15, 2014

Export Citation:

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Assignee:

NISSHIN STEEL CO LTD (JP)

International Classes:

B21D22/30; B21D22/28

Domestic Patent References:

WO2013008892A1

2013-01-17

Foreign References:

JP5395301B1	2014-01-22
JPH10156481A	1998-06-16
JP2002267014A	2002-09-18
JP2012167818A	2012-09-06
JP2006193776A	2006-07-27

Other References: