Title:
METHOD OF PRODUCTING METAL PIPE WITH GROOVE OR PROJECTION ON INNER SURFACE
Document Type and Number:
Japanese Patent JPS5439353
Kind Code:
A
Abstract:
PURPOSE: To produce a long-sized pipe with a line groove or projection on the inner surface with a rotating planetary roll outside thereof pressed against a plug fixed inside thereof utilizing an electromagnetic force while given an axial feed to the pipe.
Inventors:
TATSUMI ARITAKA
Application Number:
JP10565677A
Publication Date:
March 26, 1979
Filing Date:
September 02, 1977
Export Citation:
Assignee:
HITACHI CABLE
International Classes:
B21C1/22; (IPC1-7): B21C1/22
Previous Patent: JPS5439352
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