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Patent Searching and Data


Title:
METHOD AND DEVICE FOR MONITORING CONDITION OF WALL THICKNESS DEVIATION OF SEAMLESS PIPE
Document Type and Number:
Japanese Patent JPS59159218
Kind Code:
A
Abstract:

PURPOSE: To grasp accurately a condition of the wall thickness deviation of a pipe and the causes of its generation by continuously measuring a vibrating condition in the longitudinal direction of a blank pipe in rolling and monitoring the condition of wall thickness deviation basing of the periodicity of the vibration.

CONSTITUTION: A line sensing camera 6 for monitoring a pipe 2 in rolling and a hot steel detector 4 for detecting the front and rear ends of the pipe 2 are provided to the outlet sides of an elongator 1 for elongating and reducing its wall thickness by a mandrel 3. Next, when a pipe size and rolling conditions, etc. are previously inputted, as an external information 10, to a processing device 8, and a dislacement of pipe 2 is took in the device 8 by the camera 6 basing on its radiant light; a Fourier transducer 7 samples by a prescribed pitch the analogized signals obtained from the camera 6 through a controller 5 to obtain the periodic spectrum of them by Fourier transformation, and the device 8 performs the frequency analysis to output the results to a printer 9 or an alarm. In this way, a condition of the wall thickness deviation of a blank pipe during rolling is accurately grasped and the causes of the deviation are searched.


Inventors:
SANO MASAKAZU
Application Number:
JP3315583A
Publication Date:
September 08, 1984
Filing Date:
March 01, 1983
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B17/08; B21B37/18; B21B37/78; B21C51/00; B21B19/08; (IPC1-7): B21B17/00; B21C51/00; G01B17/02
Attorney, Agent or Firm:
Yoshihisa Nagai