| 摘要 |
Casting apparatus for the vacuum-assisted casting of a melt includes a vacuum box defining a vacuum chamber and a gas permeable casting mold having a first mold portion confronted by the vacuum chamber and a second mold portion unconfronted by the vacuum chamber. The mold includes a mold cavity and a melt inlet that is disposed in the second mold portion for engaging a source of the melt and supplying the melt to the mold cavity. A refractory shield confronts the second mold portion and includes a melt-engaging portion having a melt inlet in melt flow communication with the melt inlet of the mold. A substantially gas impermeable seal is disposed between the refractory shield and the second mold portion for inhibiting ambient gas flow into the vacuum chamber when the vacuum chamber is evacuated during casting. The seal is protected by the refractory shield from heat from the melt when the melt-engaging portion of the refractory shield is engaged with the melt during casting.
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