PRESS MOLD AND METHOD FOR MANUFACTURING STEEL PIPE

Title:

PRESS MOLD AND METHOD FOR MANUFACTURING STEEL PIPE

Document Type and Number:

WIPO Patent Application WO/2018/168563

Kind Code:

A1

Abstract:

A press mold used in a steel pipe forming step for obtaining an open pipe as a pipe body having a seam gap part in the longitudinal direction thereof by pressing a formed body having a U-shaped cross-section formed by bending a plate material, and then joining the seam gap part to obtain a steel pipe, wherein the press mold is composed of a pair of molds and configured so that the formed body is installed in one mold of the pair of molds so that the other mold and a U-shaped open side of the formed body face each other, and the formed body is pressed in a state in which the formed body is interposed between the pair of molds, arc parts having a diameter the same or substantially the same as the outside diameter of the steel pipe being formed in surfaces of the molds that can touch the formed body, so that the arc centers thereof are positioned at positions coinciding with working centers of the molds, the central angles of the arc parts in the molds being at least 70 degrees, and the total of the central angles of both molds being less than 360 degrees.

Inventors:

HORIE MASAYUKI (JP)
MIWA TOSHIHIRO (JP)
TAMURA YUKUYA (JP)
MIYAKE MASARU (JP)

Application Number:

PCT/JP2018/008489

Publication Date:

September 20, 2018

Filing Date:

March 06, 2018

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

B21D5/01

Domestic Patent References:

WO2016084607A1	2016-06-02
WO2014188468A1	2014-11-27
WO2014192043A1	2014-12-04
WO2016084607A1	2016-06-02

Foreign References:

JP2003039115A	2003-02-12
JP2002178026A	2002-06-25
JP2004082219A	2004-03-18
JP2011056524A	2011-03-24
JP2005324255A	2005-11-24
JP2005021907A	2005-01-27
JP2012250285A	2012-12-20
US4149399A	1979-04-17

Other References: