| 摘要 |
The present invention pertains to an apparatus for casting comprised of a pressure vessel and means for evacuating and pressurizing the vessel. The evacuating and pressurizing means is in fluidic connection with the vessel. The apparatus is also comprised of a crucible disposed in the pressure vessel within which material is melted. There is a mold disposed in the pressure vessel. Additionally, the apparatus is comprised of means for heating material in the crucible and the mold in the mold chamber such that material is melted in the crucible and stays melted as it is drawn up to the mold chamber while the evacuating and pressurizing means evacuates the vessel, and when it is forced into the mold while the evacuating and pressurizing means charges the vessel. The heating means is disposed in the vessel. The pressurizing means comprises at least one chill line which serves to chill the mold as the vessel is pressurized. The present invention also pertains to a method for casting. The method comprises the steps of placing in a mold chamber of a pressure vessel a mold; placing in a crucible of the pressure vessel a material; evacuating the vessel through the mold chamber; melting the material in the crucible; placing the crucible in fluidic connection with the mold chamber; and pressurizing the vessel at a controlled rate such that the pressurized gas flows through the chill line thereby serving the dual purpose of pressurizing the vessel and chilling the mold.
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