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Title:
DETECTION OF MELTING-DOWN OF PLUG OF PIERCER IN STEEL PIPE MANUFACTURING STAGE
Document Type and Number:
Japanese Patent JPS58181411
Kind Code:
A
Abstract:

PURPOSE: To detect accurately the melting-down of a plug, by measuring a motor current at the time when a shell is separated by retreating a thrust block, and comparing the current with a motor current in a normal state.

CONSTITUTION: When a shell 5 is separated with the aid of a stripper 6 by retreating a thrust block 7 to retreat the shell 5, plug 1, and a plug holder 3, an electric current at the part (b) while the part (b) is being separated indicates an approximately fixed value in a motor current of the block 7. When anything unusual occurs in the plug 1, a part corresponding to a part (b') indicates an abnormal electric current pattern such as (b'). Thus an abnormal state of the plug 1 is detected by comparing a current taken out from an operating motor of the block 7 with an electric current at the normal state.


Inventors:
OOYA NOBORU
ONOHARA HARUO
TSUDA TAKAO
Application Number:
JP6401782A
Publication Date:
October 24, 1983
Filing Date:
April 19, 1982
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
G01M99/00; B21B17/00; B21B19/04; B21C51/00; G01L5/00; (IPC1-7): B21C51/00; G01M19/00
Attorney, Agent or Firm:
Tomoyuki Yathata