Method and apparatus for controlling the molten metal level in a mold in continuous casting
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United States of America Patent
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Oct 15, 2002
Issued Date -
N/A
app pub date -
Dec 20, 2000
filing date -
Apr 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for controlling the level of molten metal in a mold for continuous casting by using a molten metal level control system incorporating a molten metal level controller in the control loop thereof, which comprises damping selectively the predetermined frequency of frequencies of periodical molten metal level fluctuations through a notch filter installed in the control loop. The control loop preferably includes the phase compensation calculation part for compensating the phase delay of the stopper opening position control signal for adjusting the amount of the molten metal to be fed to the mold. The control apparatus in the control loop comprises a molten metal level senser, an FFT analyzer, an automatic tuning device for dealing with the results of the FFT analysis, a molten metal level controller and a notch filter.
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