System and method for high temperature die casting tooling

摘要

A die casting and a method for die casting a metal having a melting temperature of at least 1500° F. (815° C.) are disclosed. A molten volume of metal is injected to a casting die which includes a main cavity corresponding to an as-cast structure, a first reservoir, and a first runner arrangement. The first runner arrangement is configured to fluidly communicate molten metal between the first reservoir and the main cavity. After the injecting step, the casting die is sealed. The injected molten volume of metal is equiaxially solidified generally from a first portion of the main cavity distal to the first reservoir toward a second portion of the main cavity proximal to the first reservoir. During the equiaxial solidifying step, the main cavity is backfilled with at least a portion of the injected molten volume via the first runner arrangement.

主权项

1. A method for die casting a metal having a melting temperature of at least 1500° F. (815° C.), the method comprising the steps of:
injecting a molten volume of the metal into an interior volume of a casting die, the casting die comprising a main cavity corresponding to an as-cast structure, a first reservoir having dimensions with an aspect ratio (height to cross-sectional area) between 0.5 and 2.0, and a first runner arrangement having at least one runner configured into one or more wedges serially connecting the first reservoir and the main cavity to fluidly communicate molten metal between the first reservoir and the main cavity, the molten volume sufficient for filling the main cavity, the first reservoir and at least a portion of the first runner arrangement; venting vapor through a vent in serial fluid communication with the first reservoir, the vent having at least one passage for evacuating vapor from the interior volume; after the injecting step and the venting step, sealing the casting die; equiaxially solidifying the injected molten volume of metal, solidification proceeding generally from a first portion of the main cavity distal to the first reservoir toward a second portion of the main cavity proximal to the first reservoir; and during the equiaxial solidifying step, backfilling the main cavity with at least a portion of the injected molten volume via the first runner arrangement to substantially maintain a continuous solidification front within the main cavity.