Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1990-11-01
1992-05-12
Batten, Jr., J. Reed
Metal founding
Process
Shaping liquid metal against a forming surface
164 97, 164119, 164127, 164254, 164284, 164337, B22D 1806, B22D 1914
Patent
active
051118718
ABSTRACT:
A porous preform is placed within a permanent, nonporous, thin walled mold chamber. The mold chamber is disposed within a pressure vessel. A material is placed in a crucible of the pressure vessel. The pressure vessel is evacuated through a snorkel fluidically connected to the mold chamber. There is means for cooling the snorkel in thermal communication with the snorkel. The material is melted within the crucible. The crucible is placed in fluidic communication with the mold chamber such that the melted material seals the inside of the mold chamber from the pressure vessel to isolate a vacuum within the mold chamber. Finally, the vessel is pressurized at a controlled rate such that the pressure in the mold chamber is able to have time to be driven towards equilibrium with the vessel and therefore allowing differential pressure control while the mold chamber is continually evacuated such that the melted material is drawn into the mold chamber and seals the snorkel by forming a solidification plug and the melted material is forced into the porous preform.
REFERENCES:
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patent: 3599601 (1971-08-01), Ishikawa et al.
patent: 3828839 (1974-08-01), Dhingra
patent: 4476916 (1984-10-01), Nusbaum
patent: 4573517 (1986-03-01), Booth et al.
patent: 4763717 (1988-08-01), Lajoye
patent: 4889177 (1989-12-01), Charbonnier et al.
Batten, Jr. J. Reed
PCast Equipment Corporation
Schwartz Ansel M.
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