DIE FOR BENDING-PRESS FORMING

Title:

DIE FOR BENDING-PRESS FORMING

Document Type and Number:

WIPO Patent Application WO/2015/152107

Kind Code:

A1

Abstract:

[Problem] To propose a die for bending-press forming whereby the effects of bending moments are small and a high-roundness cylinder can be obtained. [Solution] In this die for bending-press forming, said die comprising a left/right pair of die blocks (1) that support a sheet material (S) at two points and a punch (2) that can move toward and away from the die blocks (1) and bends the sheet material (S) sandwiched between the die blocks (1) and the punch (2) by successively applying pressure thereto in the width direction thereof, the punch (2) comprises the following: a punch head (2a) that has a working surface (K) that directly contacts the sheet material (S) and applies pressure thereto so as to give the sheet material (S) a concave shape; and a punch support (2b) that is attached to the punch head (2a) so as to be held thereby and supports said punch head (2a). The center (O) of the working surface (K) of the punch head (2a) coincides with the central axis (q) of the punch support (2b), and the shape of said working surface (K) is a non-uniform circular arc, the radius thereof in the widthwise middle thereof being the maximum radius thereof.

Inventors:

HORIE MASAYUKI (JP)
YASUHARA ISAMU (JP)
TAMURA YUKUYA (JP)
TANIICHI KENJI (JP)

Application Number:

PCT/JP2015/059833

Publication Date:

October 08, 2015

Filing Date:

March 30, 2015

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

B21D5/01

Foreign References:

JP2012250285A	2012-12-20
DE19504736A1	1996-08-14
JP2004261845A	2004-09-24
JP2005324255A	2005-11-24
JP2004082219A	2004-03-18

Other References: