Patent ID: 6250367
Filing Date: 2001-06-26
Classification: A61C,B22D,F27D

Abstract:
A molten metal pouring timing determining apparatus comprising:a melting vessel for receiving a metal material therein;heating means for radio frequency (RF) induction heating said melting vessel with a radio frequency (RF)signal amplitude-modulated with a low frequency signal;a light receiver for receiving light emitted by the metal material in said melting vessel and developing a light-representative signal representing the received light;frequency component extracting means for extracting, from said light-representative signal, a frequency component having a frequency higher than said low frequency signal; anda comparator for developing an output signal when an output signal of said frequency component extracting means exceeds a reference signal; anda pouring command unit for causing molten metal in said melting vessel to be poured into a die in response to an output signal developed by said comparator.