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Title:
PLUG, PIERCING MILL AND METHOD OF PRODUCING SEAMLESS TUBE USING THE SAME
Document Type and Number:
Japanese Patent JP2010227999
Kind Code:
A
Abstract:

To provide a plug which enables flaws on the internal surface of a hollow tube stock formed by piercing/rolling to be prevented, and can be produced without requiring long production time and has the prolonged life.

The plug 2 includes: a front portion 21 having a convex curvature; a column portion 22 having approximately a columnar shape; a trunk portion 23 having an outside diameter which is enlarged gradually toward the rear end; a mandrel connecting portion 26 provided in the rear end portion of the plug 2 and a lubricant jetting hole 24 which penetrates the trunk portion 23 from the mandrel connecting portion 26 and opened on the surface of the column portion 22. On the surface of the base metal of the front portion 21 and of the trunk portion 23, a coating film 27 which is composed of oxides and Fe is formed by arc spraying method using an iron wire. During piercing/rolling, the plug 2 pierces a base stock while jetting the lubricant from the jetting hole 24.


Inventors:
HIGASHIDA YASUTO
HIDAKA YASUYOSHI
SHIMODA KAZUMUNE
YAMAKAWA TOMIO
Application Number:
JP2009111068A
Publication Date:
October 14, 2010
Filing Date:
April 30, 2009
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B25/04; B21B19/04; B21B25/00
Domestic Patent References:
JPS5913924B21984-04-02
JPH10249412A1998-09-22
Foreign References:
WO2006134957A12006-12-21
Attorney, Agent or Firm:
Michio Mori
Hideyuki Matsunaga