(19)
(11) EP 0 388 235 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.10.1990 Bulletin 1990/43

(43) Date of publication A2:
19.09.1990 Bulletin 1990/38

(21) Application number: 90302880.1

(22) Date of filing: 16.03.1990
(51) International Patent Classification (IPC)5B22D 18/06, B22D 18/04, B22D 19/14
(84) Designated Contracting States:
AT DE FR GB IT

(30) Priority: 17.03.1989 US 325221

(71) Applicant: PCC COMPOSITES, INC.
Pittsburgh, Pennsylvania 15238 (US)

(72) Inventor:
  • 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.





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