| 摘要 |
PURPOSE:To obtain a controlling method which requires a shorter time for operations and is easy to execute on line by correcting the set value of a heating zone according to the difference between the estimated temp. of a steel ingot and a control temp. at the inlet of the heating zone of a furnace. CONSTITUTION:Out of the heating curves showing the temps. of each position of a steel ingot, for example, the curve that minimizes the quantity of charged heat input is used as a control curve T. The controlling temp. TA at the inlet A of the heating zone 3 of a furnace 1, its permissible difference DELTATA, and the temp. TB at an outlet B are stored in a curve selection circuit 11. A furnace temp. controller 5 is set at the curve T, and the signals for respective furnace temp. detectors 6, a position detector 7, and a device 8 showing steel kinds and sizes are applied to an operation data controller 9. The estimated temp. tA at the arrival of the ingot at the inlet A of an ingot temp. operating circuit 10 is compared with the temp. TA from the circuit 11 in a comparator 12, and the deviation DELTAtA thereof is compared with the difference DELTATA in a furnace temp. set value operating circuit 13. Only when DELTAtA>DELTATA, the furnace set value TS of the zone 3 for the purpose of heating the ingot to the temp. TB at the outlet B is displayed in a device 15, and a controller 5 is operated. |
