DRIFT CURRENT DETECTION METHOD AND DRIFT CURRENT CONTROL METHOD, MOLTEN METAL SURFACE VARIATION DETECTION METHOD AND MOLTEN METAL SURFACE VARIATION CONTROL METHOD IN CONTINUOUS CASTING MOLD, DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To improve detection accuracy of a drift current in a casting mold and detection accuracy of molten metal surface variation and to stabilize casting piece quality by grasping an influence of heat transfer on a molten metal surface position to detect a molten metal surface level and, thereby, improving the detection accuracy of the molten metal surface level.SOLUTION: An input part 101 inputs measurement values of a plurality of thermocouples 6 which are arranged and embedded in casting directions of casting width sides 2a, 2b. A calculation part 102 analyses a heat transfer inverse problem by using the measurement values of the thermocouples 6 inputted on the input part 101 and calculates a vector component value in a casting direction of a thermal flux on an operating surface, in other words, the vector component value in the direction vertical to the molten metal surface of the thermal flux on the operating surface. A molten metal surface level difference analysis part 103 judges such a position that a vector component value in a normal direction of the molten metal surface which becomes reverse to the casting direction of the thermal flux on the operating surface calculated by the calculation part 102 gets to maximum as a molten metal surface level and determines a molten metal surface level difference ΔY on the operating surfaces of casting mold width sides 2a, 2b as an index of the drift current.SELECTED DRAWING: Figure 4