Method of casting and casting machine

A method of gravity die casting in a casting machine including a casting die, said method comprising the steps of:

• pouring molten metal into a cavity of the casting die by pouring molten metal through a feeder head;
• setting a cooling rate of the molten metal filled in an uncoated area of the cavity at about 500° C./min. or more and a cooling rate of the molten metal poured into the feeder head portion at about 500° C./min. or less to provide an average dendrite size to increase fluidity and toughness;
• reacting the molten metal with a deoxidizing compound in the cavity so as to deoxidize an oxide film formed on a surface of the molten metal;
• solidifying the molten metal filled in the cavity;
• and
• supplementing the molten metal in the feeder head to the cavity when the molten metal in the cavity is solidified and shrinked.

A gravity die casting method, comprising the steps of;

• pouring molten metal into a cavity of the a molding die;
• reducing an oxide film formed on a surface of the molten metal by allowing the molten metal and a substance of the deoxidizing compound from a heated receptacle to flow into contact in the cavity;
• reacting the molten metal with the deoxidizing compound, a substance of which is carried separately in the cavity, so as to deoxidize an oxide film formed on a surface of the molten metal;
• solidifying the molten metal filled in the cavity, and
• supplementing the molten metal in the feeder head to the cavity when the molten metal in the cavity is solidified and shrinked.

A gravity die casting method, comprising the steps of:

• pouring molten metal into a cavity of the a molding die;
• forming a deoxidizing compound in the cavity by:
• introducing a first substance in the cavity which acts to provide the cavity in a non oxidizing atmosphere and
• introducing a second substance in the cavity, separate, from the first substance, to mix with the first substance to form the deoxidizing compound;
• reacting the molten metal with the deoxidizing compound in the cavity so as to deoxidize an oxide film formed on a surface of the molten metal;
• solidifying the molten metal filled in the cavity;
• and
• supplementing the molten metal in the feeder head to the cavity when the molten metal in the cavity is solidified and shrinked.

A gravity die casting method, comprising the steps of:

• pouring molten metal into a cavity of the a molding die;
• providing a carrier agent into a heated receptacle which holds a substance of a deoxidizing compound, introducing the substance into the cavity by using the carrier agent to form the deoxidizing compound in the cavity;
• reducing an oxide film formed on a surface of the molten metal by allowing the molten metal and the deoxidizing compound from a heated receptacle to flow into contact in the cavity;
• reacting the molten metal with the deoxidizing compound in the cavity so as to deoxidize an oxide film formed on a surface of the molten metal;
• solidifying the molten metal filled in the cavity and supplementing the molten metal in the feeder head to the cavity when the molten metal in the cavity is solidified and shrinked.