PURPOSE: To improve the product quality by justly matching molten metal temp. poured into a mold to a suitable temp.
CONSTITUTION: A target temp. arithmetic part 31 reads out operational conditions of a heat from an operational condition file 34 and applies to a temp. dropping equation to obtain a temp. dropping rate from the steel tapping time to the casting time. Further, the suitable temp. Tb at the casting time is read out from the operational condition file 34 and the target temp. Ta of the molten steel at the steel tapping time in addition to the calculated value of the temp. dropping rate is decided and given to a target temp. correcting part 33. A deviation arithmetic part 32 calculates the deviation α of the actual measured temp. Tb' at the casting time given from a casting thermometer 50 from the proper temp. Tb and stores into the actual result file 33 at the time of operating each heat. The target temp. correcting part 33 reads out the deviation α in the previous heat stored in the actual result file 35 at the time of giving the target temp. Ta from the target temp. arithmetic part 31. By this method, in addition to the target temp. Ta, the correcting target temp. Tb' is obtd. and this result is outputted to a blowing control part 10 in order to be the target value of the blowing control in a steel-making furnace.
NAGASAWA NAOHITO
FURUSAWA MASAO
