Patent ID: 6745816
Filing Date: 2004-06-08
Classification: B22C,B22D

Abstract:
A method of gravity die casting in a casting machine including a casting die, in which a feeder head is provided between a metal inlet and a cavity and in which heat insulating of the feeder head is greater than that of the cavity so as to make cooling rate of the feeder head lower than that of the cavity, said method comprising the steps of:pouring molten metal into the cavity; 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; and supplementing the molten metal in the feeder head to the cavity when the molten metal in the cavity is solidified and shrinked, more and the cooling rate of the feeder head is less than 500Â° C./min.