Centrifugal countergravity casting

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 13/04 (2006.01)

Patent

CA 2447994

Method and apparatus for countergravity casting a plurality of articles wherein a ceramic mold (10) is provided having an upstanding riser passage (12) and a plurality of mold cavities (16) disposed along a length of the riser passage (12) at different elevations, each mold cavity (16) communicating to the riser passage (12) via a gate passage (14), wherein molten metal is forced to flow upwardly from a source into the riser passage (12) for supply to the mold cavities (16) via their gate passages (14), wherein the mold is rotated so that molten metal that resides in the gate passages is subjected to centrifugal force in a direction toward the mold cavities (16), and wherein molten metal in the riser passage is drained to empty the riser passage before molten metal in the mold cavities (16) and the gate passages solidifies, leaving the gate passages at least partially filled with molten metal for supply to the mold cavities (16) in response to shrinkage.

L'invention concerne un procédé et un appareil de moulage contre-gravité de plusieurs articles, ainsi qu'un moule céramique (10) pourvu d'un passage (12) montant vertical et plusieurs cavités (16) disposées à différentes hauteurs le long du passage montant (12). Chaque cavité communique avec le passage montant (12) par le biais d'une passerelle (14); le métal fondu est ainsi forcé de remonter à partir d'une source dans le passage montant (12) pour alimenter les cavités (16) par le biais de leurs passerelles (14). Le moule, qui tourne, a pour effet de soumettre le métal fondu se trouvant dans les passerelles à une force centrifuge en direction des cavités (16), et le métal fondu dans le passage montant est drainé de façon à vider ledit passage montant avant que le métal fondu se trouvant dans les cavités (16) et les passerelles ne se solidifie, les passerelles restant ainsi au moins partiellement remplies de métal fondu en vue d'alimenter les cavités (16) en réponse au retrait.

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