Method of pore-free die casting
First Claim
1. A method of reducing the pores formed in a material cast in a die cavity by the hot chamber process including a gooseneck and nozzle combination for filling the die cavity, the method comprising the steps of:
- substantially displacing non-reactive gas from the gooseneck and nozzle combination with the material by filling at least a portion of the gooseneck and nozzle combination to a predetermined level with the material;
maintaining the material in the gooseneck and nozzle combination at said predetermined level while purging the die cavity with a reactive gas and thereafter until the die cavity is to be filled with the material; and
filling the die cavity with the material through the gooseneck and nozzle combination whereby substantially no non-reactive gas is forced into the die cavity by the material as the material fills the die cavity, the reactive gas reacting with the material in the die cavity to form a solid compound therewith rather than the pores which non-reactive gas would have formed in the cast material.
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Abstract
In a hot chamber method of pore-free die casting in which a reactive gas flushes non-reactive gas such as air from a die before a material is cast therein, the material displaces non-reactive gas from the gooseneck and nozzle through which the die is filled before the reactive gas flushes the die. The material then does not push non-reactive gas into the die as it fills the die. Apparatus for practicing the method comprises servo-control means for filling the gooseneck and nozzle with the material before the reactive gas flushes the die to displace non-reactive gas therefrom and then filling the die with the material after the reactive gas has flushed the die.
18 Citations
6 Claims
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1. A method of reducing the pores formed in a material cast in a die cavity by the hot chamber process including a gooseneck and nozzle combination for filling the die cavity, the method comprising the steps of:
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substantially displacing non-reactive gas from the gooseneck and nozzle combination with the material by filling at least a portion of the gooseneck and nozzle combination to a predetermined level with the material; maintaining the material in the gooseneck and nozzle combination at said predetermined level while purging the die cavity with a reactive gas and thereafter until the die cavity is to be filled with the material; and filling the die cavity with the material through the gooseneck and nozzle combination whereby substantially no non-reactive gas is forced into the die cavity by the material as the material fills the die cavity, the reactive gas reacting with the material in the die cavity to form a solid compound therewith rather than the pores which non-reactive gas would have formed in the cast material. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification