Title:
MOLTEN METAL SURFACE LEVEL CONTROL IN MOLD IN CONTINUOUS CASTING
Document Type and Number:
WIPO Patent Application WO/2000/066293
Kind Code:
A1
Abstract:
A molten metal level control method comprising the steps of determining in advance a frequency of periodical variations in molten metal surface level and allowing a notch filter, which selectively damps the determined frequency, to be involved in a control loop in a molten metal surface level control system. It is further desirable to allow a phase compensation operation unit, for compensating for a phase delay of an opening control signal for a stopper that controls a molten metal amount into a mold, to be involved in the control loop. A control device which comprises a molten metal surface level sensor, an FFT analyzer, an automatic tuning device for a FFT analysis result, a molten metal surface level controller, and notch filter. A continuous casting method which uses the control method and the control device to cast cross-sectionally rectangular cast billets.
Inventors:
HANAZAKI KAZUHARU (JP)
MURAKAMI TOSHIHIKO (JP)
OKA MASAHIKO (JP)
MURAKAMI TOSHIHIKO (JP)
OKA MASAHIKO (JP)
Application Number:
PCT/JP2000/000398
Publication Date:
November 09, 2000
Filing Date:
January 27, 2000
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
HANAZAKI KAZUHARU (JP)
MURAKAMI TOSHIHIKO (JP)
OKA MASAHIKO (JP)
HANAZAKI KAZUHARU (JP)
MURAKAMI TOSHIHIKO (JP)
OKA MASAHIKO (JP)
International Classes:
B22D2/00; B22D11/16; B22D11/18; (IPC1-7): B22D11/16; B22D11/18
Foreign References:
| JPH0523811A | 1993-02-02 | |||
| JPH08147044A | 1996-06-07 | |||
| JPH10146658A | 1998-06-02 | |||
| JPH10314911A | 1998-12-02 | |||
| JPH1177268A | 1999-03-23 | |||
| JPH11170021A | 1999-06-29 |
Other References:
See also references of EP 1097765A4
Attorney, Agent or Firm:
Hirose, Shoichi (Nihonbashi Honcho 4-chome Chuo-ku Tokyo, JP)
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