Title:
METHOD OF DETECTING DEFECTS IN ROTARY PIERCING, SEAMLESS PIPE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2012/060358
Kind Code:
A1
Abstract:
Disclosed is a method for detecting defects in rotary piercing with high accuracy. A rotary piercing mill (10) is provided with piercer rollers (1a, 1b), a piercer plug (3), a rolling load sensor (4), a thrust load sensor (5) and a control unit (6). The control unit (6) measures a rolling load parameter corresponding to the rolling load of the piercer rollers (1a, 1b), and a thrust load parameter corresponding to the thrust load of the piercer plug (3), and detects defects in rotary piercing on the basis of the measured value of the rolling load parameter and the measured value of the thrust load parameter.
Inventors:
FUJIWARA MASAKAZU (JP)
Application Number:
PCT/JP2011/075148
Publication Date:
May 10, 2012
Filing Date:
November 01, 2011
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
FUJIWARA MASAKAZU (JP)
FUJIWARA MASAKAZU (JP)
International Classes:
B21B19/04; B21C51/00
Foreign References:
JP2002192229A | 2002-07-10 | |||
JP2001162307A | 2001-06-19 | |||
JP2000334506A | 2000-12-05 | |||
JP2000246311A | 2000-09-12 | |||
JP2000000605A | 2000-01-07 |
Other References:
See also references of EP 2636462A4
None
None
Attorney, Agent or Firm:
OHNAKA Minoru (JP)
Minoru Onaka (JP)
Minoru Onaka (JP)
Download PDF:
Claims:
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