Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1978-12-13
1980-07-01
Baldwin, Robert D.
Metal founding
Process
Shaping liquid metal against a forming surface
75130R, 75130B, 164 55, B22D 2300, B22D 2500, B22D 2720
Patent
active
042101956
ABSTRACT:
A method of treating molten cast iron is disclosed, wherein a sand mold is formed with a gating system, a plurality of casting cavities, and treating chambers all located symmetrically about a parting plane of said mold. The treating chamber is interposed in the gating system and is configured to receive a predetermined sized module of treating alloy arranged to fit snuggly within a predetermined size lower portion of said chamber. The module is comprised of fiberboard folded into a closed container condition and filled with granular treating alloy particularly comprised of nominally 5% MgFeSi. The molten metal reacts progressively from the top of said module to the bottom portion thereof as the molten metal flows over and therepast. The fiberboard enclosed granules constitute a convenient, economical and improved mode for treating molten cast iron particularly when nodularization is required, and particularly with restrictions such as those imposed by the shall mold technique wherein the centerline of the reaction chamber coincides with the parting line of the mold. Due to differential ferrostatic head heights during mold filling there is a radical variation in flow rate through the treatment chamber. These conditions necessitate the use of a granular material with a tendency to more immediately react with the molten metal than a cast-to-shape or briquetted material. The granular material is enclosed in the module of sufficient integrity to hold a cubicle configuration extending across the plating plane, allowing the mold halves to be closed.
REFERENCES:
patent: 3605857 (1971-09-01), Duhem
patent: 4004630 (1977-01-01), Dunks
patent: 4037643 (1977-07-01), Mohla et al.
Baldwin Robert D.
Ford Motor Company
Hampilos Gus T.
Malleck Joseph W.
Zerschling Keith L.
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