Method for controlling the molten metal level inside a continuous casting machine mold and method for manufacturing steel using the same.

The method controls molten metal level fluctuations in continuous casting machines by using PI control with bulging disturbance compensation and spectral peak analysis to manage disturbance compensation, stabilizing steel production and improving yield.

JP7916858B2Active Publication Date: 2026-09-08JFE STEEL CORP
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Patent Information

Application Number
JP2023146487
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-09-08
Publication Date
2026-09-08
Estimated Expiration
2043-09-08

AI Technical Summary

Technical Problem

Existing methods for controlling molten metal level fluctuations in continuous casting machines either require ineffective disturbance compensation or worsen fluctuations when not needed, or negatively impact fluctuations due to factors other than standing waves.

Method used

A method that involves detecting molten metal level fluctuations, using PI control with a bulging disturbance compensation component, and adjusting the sliding nozzle opening based on spectral peak analysis to determine when to start or stop disturbance compensation, setting thresholds to differentiate effective and adverse effects.

Benefits of technology

Effectively suppresses bulging molten metal level fluctuations, stabilizes steel production, reduces surface defects, and improves yield by accurately determining the need for disturbance compensation.

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Abstract

To provide a method of controlling a molten metal surface level in a mold for a continuous casting machine, capable of effectively suppressing a fluctuation of a bulging molten metal surface level even in either case where the molten metal surface fluctuation in which the outer disturbance compensation becomes effective has not occurred and where the molten metal surface fluctuation in which the outer disturbance compensation becomes effective has occurred but has subsided.SOLUTION: A method of controlling a molten metal surface level in a mold for a continuous casting machine determines, based on a detection of a spectrum peak by frequency analysis of a molten metal surface level signal, to stop or continue an addition in an amount of the outer disturbance compensation.SELECTED DRAWING: Figure 3
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