COOLING METHOD OF CASTING PLATE

摘要

PURPOSE:To grow a solidified shell to a uniform thickness and to prevent the generation of internal defects by measuring the thickness of the solidified shell in the transverse direction of a casting plate and changing the cooling condition in the transverse direction in accordance with the thickness thereof. CONSTITUTION:A temp. measuring unit 1 provided successively with many temp. sensors 5 is provided in the transverse direction of the casting plate 3 and the measuring signals from the sensors 5 are inputted to a control unit 4 which operates the temp. distribution in the transverse direction of the plate 3. The temp. in the thin part of the solidified shell where much of the unsolidified shell of the plate 3 is contained is high and the thickness distribution of the solidified shell is detected from the above-mentioned temp. distribution. A cooling unit 2 disposed with many cooling nozzles 6 in the transverse direction of the plate 3 in such a manner that the flow rates thereof can be discretely controlled is controlled in accordance with the thickness distribution, i.e., temp. distribution of the solidified shell to change the cooling condition in the transverse direction. The solidified shell is thus grown in the uniform condition and the generation of internal defects such as the internal segregation of impurities and hollows is prevented.