Patent ID: 6964293

Claim:
A casting machine, comprising a gravity casting die, which comprises: a metal inlet, from which a molten metal is poured into said casting die; a cavity, in which the molten metal is solidified so as to cast a product; and a feeder head being provided between said metal inlet and said cavity, in which heat insulating of the feeder head is greater than that of said cavity so as to make cooling rate of said feeder head lower than that of said cavity, wherein the molten metal is reacted on a deoxidizing compound introduced by a means for introducing constituents to form the deoxidizing compound in said cavity so as to deoxidize an oxide film formed on a surface of the molten metal, and the molten metal in said feeder head is supplemented to said cavity when the molten metal in said cavity is solidified and shrinked, wherein the cavity has a thermal conductivity which produces a cooling rate of the molten metal in the cavity to be 500° C./min. or more, and the feeder head has a thermal conductivity which provides a cooling rate of the molten metal in the feeder head to be less than 500° C./min.