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Patent Searching and Data


Title:
METHOD FOR PREVENTING GENERATION OF BURR AT THE TIME OF PIERCING PIPE MATERIAL WITH PIERCER
Document Type and Number:
Japanese Patent JPH07214113
Kind Code:
A
Abstract:

PURPOSE: To prevent formation of burrs at the rear end of a base pipe in production of the base pipe for production of a steel pipe by piercing of a pipe material billet by a piercing plug and piercer roll.

CONSTITUTION: The rear end face 7 of the pipe material billet 1 is heated to a high temp. to melt by a gas cutter, such as gaseous acetylene and oxygen flame or gaseous plasma flame, etc., from a gaseous flame nozzle 2 before piercing, by which the billet is provided with a line groove 4 having a proper width and depth in a method for obtaining the base pipe for production of the steel pipe by piercing of the pipe material billet 1 by the piercing plug and the piercer roll. The shape of the line groove 4 is formed to a minus or cruciform shape and further, preferably, the size of the line groove 4 is set at a width 5 to 6mm and depth 7 to 8mm.


Inventors:
KOBAYASHI HIROYUKI
NAKAYAMA KOZO
Application Number:
JP2744094A
Publication Date:
August 15, 1995
Filing Date:
January 31, 1994
Export Citation:
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Assignee:
SANYO SPECIAL STEEL CO LTD
International Classes:
B23K10/00; B21B19/04; B23K7/06; (IPC1-7): B21B19/04; B23K7/06; B23K10/00
Attorney, Agent or Firm:
Kenji Yokoi