PLUG, PIERCING ROLLING APPARATUS AND METHOD OF MANUFACTURING SEAMLESS TUBE USING THE SAME

Title:

PLUG, PIERCING ROLLING APPARATUS AND METHOD OF MANUFACTURING SEAMLESS TUBE USING THE SAME

Document Type and Number:

WIPO Patent Application WO/2010/100968

Kind Code:

A1

Abstract:

A plug has a front portion of convex shape, a generally cylindrical portion, a trunk portion having an external radius gradually enlarging toward the rear end, a mandrel connecting portion at the rear end, and a lubricant path extending from the mandrel connecting portion through the trunk portion to a surface of the cylindrical portion. On the surfaces of the front portion and the trunk portion is formed a coat including oxides and Fe made by the arc spraying method with an iron wire. The plug enables to prevent flaws on the internal surface of hollow tubes in the piercing/rolling process and to produce without extending the production time and yet with extended service time.

Inventors:

HIGASHIDA YASUTO (JP)
HIDAKA YASUYOSHI (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)

Application Number:

PCT/JP2010/050668

Publication Date:

September 10, 2010

Filing Date:

January 21, 2010

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
HIGASHIDA YASUTO (JP)
HIDAKA YASUYOSHI (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)

International Classes:

B21B25/00; B21B19/04; B21B25/04

Domestic Patent References:

WO2006134957A1	2006-12-21
WO2006134957A1	2006-12-21

Foreign References:

JPS5913924B2	1984-04-02
JPH10249412A	1998-09-22
JPH01180712A	1989-07-18
JPH10235413A	1998-09-08
JPS51133167A	1976-11-18
JPH048498A	1992-01-13
JPH0474848A	1992-03-10
JPH04270003A	1992-09-25
JPH0647147A	1994-02-22

Other References: