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Title:
PIERCING METHOD BY PIERCER
Document Type and Number:
Japanese Patent JPS5954404
Kind Code:
A
Abstract:

PURPOSE: To prevent the defective biting of a blank material and the formation of the defective inside surface of a blank pipe by specifying the ratio of the distance from the position where the blank material is bit between rolls up to the position where the material is brought into contact with a plug with respect to the diameter of the blank material.

CONSTITUTION: The diameter of a blank material 14 under piercing with a piercer is designated as DB and the distance (grip) from the position where the material 14 is bit between rolls 11 up to the position where it is brought into contact with a plug 13 is designated as X. If X/DB is ≤0.7, there is virtually no formation of internal surface flaw and if X/DB is ≥0.3, there is virtually no generation of fast sticker. Therefore, X/DB is set at 0.3≤X/DB≤0.7.


Inventors:
KATAGIRI TADAO
Application Number:
JP16488882A
Publication Date:
March 29, 1984
Filing Date:
September 24, 1982
Export Citation:
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Assignee:
KAWASAKI STEEL CO
International Classes:
B21B19/04; (IPC1-7): B21B19/04
Attorney, Agent or Firm:
Shuji Shiokawa



 
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