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Title:
METHOD FOR PIERCING SEAMLESS STEEL PIPE
Document Type and Number:
Japanese Patent JPH07164021
Kind Code:
A
Abstract:

PURPOSE: To improve a peeling limit, and to reduce the generation factor of a guide shoe mark by that the projection of a piercing shell between a main roll and a guide shoe, becomes less.

CONSTITUTION: When piercing a seamless steel pipe by the Mannesman system, a relative position in the perpendicular direction of a main roll 1 and a piercing shell 3 in a gorge position B, is allowed to offset on the side where the piercing shell 3 projects between the main roll 1 and a guide shoe 2 by the rotations of respective main rolls 1. And, piercing is performed at a state in which a gap between the main roll 1 and the guide shoe 2 on the side where the piercing shell 3 projects, is small.


Inventors:
Kinugasa, Shusuke
Application Number:
JP1993000310370
Publication Date:
June 27, 1995
Filing Date:
December 10, 1993
Export Citation:
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Assignee:
SUMITOMO METAL IND LTD
International Classes:
B21B19/04; B21B23/00; (IPC1-7): B21B19/04; B21B23/00
Domestic Patent References: