Cook, Arnold J. Mt. Pleasant, Pennsylvania 15666 (US)
(74)
Representative: Jones, Michael Raymond et al
HASELTINE LAKE & CO.
Hazlitt House
28 Southampton Buildings
Chancery Lane London WC2A 1AT London WC2A 1AT (GB)
(56)
References cited: :
(54)
Method and apparatus for casting
(57) An apparatus (10) comprising a pressure vessel (12) and a device for evacuating and
pressurizing the vessel (12). The evacuating and pressurizing device is in fluidic
connection with the vessel (12). The apparatus (10) is also comprised of a crucible
(14) disposed in the pressure vessel (12) within which material (16) is melted. There
is a mold chamber (18) disposed in the pressure vessel (12) within which a mold (20)
is held. The mold chamber (18) is in fluidic connection with the crucible (14). Additionally,
the apparatus (10) is comprised of a device for heating material in the crucible (14)
and the mold (20) in the mold chamber (18) such that material is melted in the crucible
(14) and stays melted as it is drawn to the mold chamber (18) while the evacuating
and pressurizing device acts on the vessel (12), and when it is forced into the mold
(20) while the evacuating and pressurizing device pressurizes the vessel (12). The
heating device is disposed in the vessel (12). Additionally, there is a method comprising
the steps of placing in a mold chamber (18) of a pressure vessel (12) a fiber array
mold (20); placing in a crucible (14) of the pressure vessel (12) a material; evacuating
the vacuum vessel (12) through the mold chamber (18); melting the material in the
crucible (14); placing the crucible (14) in fluidic connection with the mold chamber
(18); and charging the vessel (12) while it is continually evacuated such that the
melted material is drawn into the mold chamber (18) and forced into the mold (20).
Additionally, there is a method for reducing the required mold (20) strength by controlling
the pressuie at the mold (20) wall by controlling the pressurization rate.