Patent ID: 6516019
Filing Date: 2003-02-04
Classification: B22D

Abstract:
An oxidation prevention method for melted metal material in a melting vessel, said vessel provided with a weighing chamber communicating with a nozzle member in an extremity thereof, a rotatable agitation member and an injection member having an extremity injection plunger advanceably and retractably inserted in said weighing chamber by passing through the agitation member, said nozzle member being installed on a slant within a downside of said melting vessel, when melting metal material in the melting vessel; said method comprising the steps of, providing in a space area over the melted metal surface of said melting vessel an inactive gas atmosphere, measuring the oxygen concentration in the space area, providing an error indication when the measured oxygen concentration exceeds a predetermined reference value, and stopping heating and material supply in response to said error indication.