Melting material, comprises filling first material to be melted in induction furnace to first level below maximum filling level of crucible, and refilling second material to be melted in dependence on power consumption of furnace

摘要

The method comprises filling a first material to be melted in an induction furnace (2) to a first level below a maximum filling level of a crucible (3) and/or below an upper edge of a coil (4) surrounding the crucible, and refilling a second material to be melted in dependence on the power consumption of the furnace and/or in dependence on the temperature of the already filled material and/or as a function of variables, from which the power consumption of the furnace or the temperature of the already filled material is calculated. The method comprises filling a first material to be melted in an induction furnace (2) to a first level below a maximum filling level of a crucible (3) and/or below an upper edge of a coil (4) surrounding the crucible, and refilling a second material to be melted in dependence on the power consumption of the furnace and/or in dependence on the temperature of the already filled material and/or as a function of variables, from which the power consumption of the furnace or the temperature of the already filled material is calculated. The step of refilling the further material takes place: when the electric power consumption decreases and/or when the electrical power consumption decreases below a predetermined or predeterminable first power value and/or when the temperature of the already filled material exceeds the predefined or predefinable temperature and/or when the temperature of the already filled material exceeds its Curie temperature; in a continuous manner such that the electrical power consumption of furnace is always above the predetermined power value and/or such that the electrical power consumption of the furnace is always equal to the rated power of the furnace; and continuously or in a step wise manner until the total quantity of the material to be melted is filled and/or up to the maximum filling level of the furnace is reached and/or until the free crucible volume is exhausted over the filled melt and/or until reaching a sufficient electromagnetic coupling due to the amount of the already melted material. The first filling level is: less than half of the maximum level of the crucible; less than half of the height of the coil surrounding the crucible; and/or concerned to the amount of the melting material, which is less than half of the maximum load capacity of the crucible. The refilling step is automatically regulated and/or takes place during the melting process with the activated coil of the induction furnace. An independent claim is included for a melting apparatus.