Method and device for producing cast parts consisting of aluminium and magnesium alloys

A process for preparing a melt of particle-reinforced Al and Mg alloy for low-pressure casting comprising the steps of:

• providing an induction crucible furnace having a melting chamber formed of electrically non-conductive, non-magnetic refractory material;
• providing an induction coil extending around the outside of the melting chamber;
• filling the melting chamber with a batch of stock material which is sufficient for a plurality of casting operations;
• subjecting the induction coil to a high frequency of more that 500 Hz for direct inductive heating and melting down of the stock material;
• subsequently subjecting the induction coil to a low frequency less than or equal to 50 Hz for heat retention and agitation of the stock material;
• and
• maintaining the melted Al and Mg alloy with the reinforcing particles dispersed therein by the low frequency agitation.