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Title:
METHOD OF MANUFACTURING SEAMLESS TUBE
Document Type and Number:
Japanese Patent JP3503559
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a piercing method using inclined rolls by which the generation of the pieces of a broken tube at the bottom tube-end after rolling is perfectly prevented.
SOLUTION: Piercing is performed by providing a small hole in the middle part of the rear end-face of a billet and also using a plug whose tip part is formed into a flat face rectangular to the axial-center line.


Inventors:
Isso Shimoda
Tomio Yamakawa
Masayuki Yamada
Application Number:
JP2000034020A
Publication Date:
March 08, 2004
Filing Date:
February 10, 2000
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B19/04; B21B25/00; (IPC1-7): B21B19/04; B21B25/00
Domestic Patent References:
JP91210A
JP1180711A
JP5933011A
JP7214112A
JP60124404A
Attorney, Agent or Firm:
Mikiji Sugioka (2 outside)