Abstract: A method is disclosed of degating clustered metal castings produced by ECP in which molten metal is gravity poured into a dry, unbonded sand mold for solidification, the mold containing a plurality of consumable foam patterns interconnected by a complex centralized gating system. The method is improved by forcing purge air through the unbonded sand mold just prior to the solidification of the core metal of the gating system, the purge air being forced into such mold at a predetermined pressure (such as 80-120 psi) and for a period of time (such as 10-20 seconds), causing the gating system to disintegrate into pieces or beads of metal. The elapsed period of time from the moment of pouring the molten metal into the mold to the moment at which the purge air is injected into the mold is critical and for certain metals is usually in the range of 3-5.7 minutes.

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.