Title:
HYDRAULIC FLATTENING METHOD OF METALLIC PIPE
Document Type and Number:
Japanese Patent JP2009285692
Kind Code:
A
Abstract:
To solve the problem that in the conventional flattening technique, in order to prevent the deterioration of flatness and a break in edge parts in a flattening part, the use of a core is needed and the deterioration of working efficiency is caused.
Liquid is poured into the inside of the inner periphery of a metallic tube 10 and, under the state where internal pressure is loaded by the pressure of that liquid, flattening work is applied until the height h of flatness becomes a prescribed height H of the flatness of a product of 0.5 times the outside diameter D of the metal tube before the flattening work.
Inventors:
HASHIMOTO YUJI
SHINGU TOYOHISA
SONOBE OSAMU
SUZUKI KOJI
SHINGU TOYOHISA
SONOBE OSAMU
SUZUKI KOJI
Application Number:
JP2008141117A
Publication Date:
December 10, 2009
Filing Date:
May 29, 2008
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
B21D17/02
Attorney, Agent or Firm:
Eiichi Kobayashi
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