INNER-SURFACE CONTROL TOOL, PLUG, MANDREL, HOT-ROLLING MILL, PUNCHING PRESS, AND DRAW BENCH

Title:

INNER-SURFACE CONTROL TOOL, PLUG, MANDREL, HOT-ROLLING MILL, PUNCHING PRESS, AND DRAW BENCH

Document Type and Number:

WIPO Patent Application WO/2014/030692

Kind Code:

A1

Abstract:

This inner-surface control tool is provided with a mandrel, a plug that is removably joined to said mandrel, and a joining member that magnetically joins the plug and the mandrel to each other. Either the plug or the mandrel has a column-shaped part that extends in the direction of the axis thereof, and the other has a connection hole, extending in the direction of the axis thereof, into which the column-shaped part is inserted. The abovementioned joining member is a permanent magnet attached to the column-shaped part and/or the connection hole.

Inventors:

YAMANE KOUJI (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)
INOUE YUJI (JP)

Application Number:

PCT/JP2013/072396

Publication Date:

February 27, 2014

Filing Date:

August 22, 2013

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B21B25/06; B21B19/04; B21C1/24; B21C3/16; B21C23/08; B21C25/04

Foreign References:

JP2009125785A	2009-06-11
JPS61177702U	1986-11-06
JP2008229648A	2008-10-02

Other References: