PURPOSE: To cool securely a steel wire rod to a prescribed temp. and to make the property thereof uniform by measuring the temp. of a refrigerant for cooling the steel wire rod, comparing the same with a target value and controlling the refrigerant temp. so that the refrigerant temp. attains always the target value.
CONSTITUTION: A steel wire rod 3 of a high temp. is passed through the refrigerant 2 in a cooling tank 1 and is thus cooled. The refrigerant 2 heated to a high temp. is pumped 4 to a heat exchanger 5 where it is cooled with water and the refrigerant 2 cooled to a low temp. is again returned to the tank 1. The temp. of the refrigerant 2 in the tank 1 is detected with a detector 7 and the measured temp. T2 thereof is outputted to a temp. control device 8. The device 8 compares the optimum target temp. T2' of the refrigerant 2 calculated in an arithmetic device 9 and the temp. T2 and controls a cooling rate control device 10 so that the temp. T2 attains the target temp. T2'. The device 10 regulates the cooling of the refrigerant 2 in the heat exchanger 5 by regulating the water feed valve 11 for the cooling water 6 thereby maintaining the temp. of the refrigerant 2 in the tank 1 constant.
HAYAMA YASUNOBU
YANAGI KENICHI
HANASAKI MIKI
INOUE SATORU
SANO MASAYOSHI
IKUNO ITSUO
IOHARA NOBORU
NIPPON STEEL CORP
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