| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately control the temperature of a hot rolled steel sheet on the outlet side of a finishing rolling machine to the target temperature.SOLUTION: A control device 13 calculates temperature distribution (x,t) in the thickness direction of the steel sheet S on the inlet side of an induction heating device 4 by using temperature distribution (x,0) in the thickness direction of the steel sheet S extracted from a heating furnace 2, and calculates the actual temperature Tc of the steel sheet on the inlet side of the induction heating device 4 by using the calculated temperature distribution (x,t), and controls a heating quantity of the steel sheet S by the induction heating device 4 based on the actual temperature Tc and the target temperature of the steel sheet S on the inlet side of the induction heating deice 4. Thus, since the heating quantity of the induction heating device 4 is controlled by taking into consideration cross-sectional temperature distribution in the thickness direction of the steel sheet S, excessive heating or insufficient heating of the steel sheet S is restrained, and the temperature of the steel sheet S on the outlet side of the finishing rolling machine 5 can be highly accurately controlled to the target temperature. |
