Patent ID: 6453985
Filing Date: 2002-09-24
Classification: B22D

Abstract:
A method of continuously casting molten metal comprising the step of feeding molten metal into a mold to produce a casting continuously while generating an electromagnetic field in the mold by applying a high frequency to the mold, the application of the high frequency is controlled in such a manner that a magnitude of an electromagnetic field which is applied to a solidification shell forming start location of the mold from which a solidification shell of the casting starts to be formed becomes equal to or greater than a minimum required flux density to be applied to the mold, the minimum required flux density being determined based on a negative time strip and a frequency in the electromagnetic field as operation parameters according to the following equation: Bmin=1130Ã—tn-5&it;fÃ—(tn-0.05)wheretn=cos-1&af;(v/2&it;Ï€Ã—fmÃ—a)/(Ï€Ã—fm)Bmin: minimum required flux density (gauss) tn: negative time strip (second) f: frequency in electromagnetic field (kHz) v: casting velocity (m/sec) fm: number of oscillation (Hz) a: one-way stroke of mold (m).