METHOD OF MANUFACTURING ULTRATHIN WALL METALLIC TUBE BY COLD WORKING METHOD

Title:

METHOD OF MANUFACTURING ULTRATHIN WALL METALLIC TUBE BY COLD WORKING METHOD

Document Type and Number:

WIPO Patent Application WO/2006/126565

Kind Code:

A1

Abstract:

Methods of manufacturing an ultrathin wall metallic tube by cold working method capable of providing a marvelous wall thickness reduction. In the method of manufacturing the metallic tube by a cold pilger rolling mill, a raw tube is cold-worked while being enlarged in diameter by using rolls having tapered hole dies with a diameter increasing from the engaging inlet side to the finishing outlet side of the rolls and a tapered mandrel having a diameter increasing from the engaging inlet side to the finishing outlet side. In the method of manufacturing the metallic tube by using a stretcher mill, a raw tube is cold-stretched while being enlarged in diameter by using a solid die with a diameter increasing from the engaging inlet side to the finishing outlet side of the rolls and a plug or a tapered mandrel with a diameter increasing from the inlet side to the outlet side of the die. In the method of manufacturing the metallic tube, the maximum finished diameter of the plug or the tapered mandrel may be larger than the outer diameter of the raw tube.

Inventors:

HAYASHI CHIHIRO (JP)

Application Number:

PCT/JP2006/310309

Publication Date:

November 30, 2006

Filing Date:

May 24, 2006

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
HAYASHI CHIHIRO (JP)

International Classes:

B21B21/00; B21C1/22

Foreign References:

JPH01192405A	1989-08-02
JPH07199507A	1995-08-04
JPS5744429A	1982-03-12
US5946365A	1999-08-31
US4866968A	1989-09-19
JPH01192405A	1989-08-02

Other References: