SEAMLESS METAL TUBE PRODUCING METHOD

WIPO Patent Application WO/2004/052569

A1

The invention relates to a seamless metal tube piercing-rolling method using an inclined roll type piercing-rolling machine, capable of greatly suppressing Mannesmann fracture or circumferential shear strain without causing a failure in billet feed. This enables a product of good inner surface quality with less inner surface flaw to be produced with high productivity. Further, strengthening the front end rolling section of a plug makes it possible to sharpen the plug, to enlarge the feed limit, and to further efficiently produce a product superior in inner surface quality. Therefore, the inventive method is applicable in a wide field in piercing-rolling of seamless metal tubes.

JP2991087	[Title of Invention] Method for manufacturing seamless pipe
JPH0471709	MANUFACTURE OF SEAMLESS TUBE

NAKAIKE HIROTSUGU (JP)
SHIMODA KAZUMUNE (JP)
YAMAKAWA TOMIO (JP)
ANRAKU TOSHIRO (JP)

PCT/JP2003/015684

June 24, 2004

December 08, 2003

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SUMITOMO METAL IND (JP)
NAKAIKE HIROTSUGU (JP)
SHIMODA KAZUMUNE (JP)
YAMAKAWA TOMIO (JP)
ANRAKU TOSHIRO (JP)

B21B19/04; B21B25/00; B21J5/10; (IPC1-7): B21B19/04; B21B25/00

JPS5750233A	1982-03-24
JPH10156410A	1998-06-16
JPH02142604A	1990-05-31
JP2002273505A	2002-09-25
JPH09300007A	1997-11-25
DE4112614A1	1992-10-22

THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY: "Bosen katachi kan'atsutei sekai o lead suru atsutei gijutsu", 20 August 1991, KORONASHA KABUSHIKI KAISHA, pages: 151, XP002986756
See also references of EP 1593441A4

Mori, Michio (Amagasaki Building 17-23, Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo, JP)

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