Importance

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Abstract

An apparatus and method for die casting includes a multi-part, reusable die having at least two die sections defining a die cavity for receiving molten material to be cast. The die sections are moveable relative to one another. Each die section defines a portion of the die cavity and the die sections define the die cavity when positioned in engagement with one another. A melting unit of the apparatus melts the material, and a shot sleeve receives molten material from the melting unit and is in fluid communication with the die. A plunger unit urges material from the sleeve into the die. The apparatus further includes a reduced pressure means, e.g., a vacuum unit, coupled to at least the die for providing a reduced pressure to at least the die cavity. A sealing mechanism of the apparatus is coupled to the die. The sealing mechanism engages the die sections to define an evacuation cavity, including at least the die cavity, when the die sections are brought into close proximity with one another, thereby enabling evacuation of the die while the die sections are in spaced relation and more thoroughly and completely evacuating the die cavity.

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First Claim