James D Oswald

US Patent:

55843344, Dec 17, 1996

Filed:

Dec 6, 1994

Appl. No.:

8/350294

Inventors:

James L. Oswald - Redford MI
Paul M. LeTarte - Troy MI
Paul A. Ballas - Dearborn MI
David L. Mitchell - Novi MI

Assignee:

Ford Motor Company - Dearborn MI

International Classification:

B22D 2720

US Classification:

164 571

Abstract:

A method in particular, comprises the steps of: (a) preparing a mold having a sprue leading to a substantially horizontally oriented runner, at least one riser extending from the runner, and walls defining a mold cavity in communication with the riser; (b) providing a shallow reaction chamber in the runner containing grain refining inoculant solids therein, the inoculant having a surface exposed substantially tangentially to the flow of molten metal through the runner; (c) pouring a charge of molten aluminum into the sprue with a sufficient pressure head to fill the cavity, the flow being substantially laminar through the runner; and (d) inverting the mold substantially immediately after mold filling and prior to solidification of the metal in the mold cavity.