James Stuart Mcpherson

US Patent:

42101956, Jul 1, 1980

Filed:

Dec 13, 1978

Appl. No.:

5/968945

Inventors:

James C. McPherson - Ypsilanti MI

Assignee:

Ford Motor Company - Dearborn MI

International Classification:

B22D 2300
B22D 2500
B22D 2720

US Classification:

164 57

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.