Ask Chemicals Gmbh

Lee R Horvath

Ronald C Aufderheide

Sam Nerone Ramrattan

Sean B Harmon

Matthew Shoffner

Paula Vivas

Ralph E Showman

Sean R Harmon

A sand additive for use in a 'no bake' foundry mix composition having a polyurethane-based binder system reduces the amount of smoke emitted when molds and cores formed from the composition are exposed to molten metal, as compared to when the sand additive is not used. The sand additive comprises yellow iron oxide having the chemical formula Fe(OH). It can also comprise at least one of red iron oxide, black iron oxide and w&#xfc;stite. In such cases, the yellow iron oxide accounts for about 10 to about 40 weight percent of the combined weight of the yellow iron oxide, red iron oxide, black iron oxide and w&#xfc;stite, and preferably, about 20 to about 30 weight percent of the combined weight of the yellow iron oxide, red iron oxide, black iron oxide and w&#xfc;stite.

Smoke-suppressing additive for polyurethane-forming binder system

A sleeve () allows flow against gravity of molten metal into a casting mold. The sleeve has a sleeve body () with a longitudinal axis that defines a flow conduit for the metal. A check valve () is positioned in the flow conduit, arranged for limited axial movement in the sleeve between a closed position and an open position, although it is operatively positioned to be in the closed position in the absence of the pressurized metal. The check valve has a spool () with an internal flow conduit, a top end of the conduit blocked by an end cap (). Flanges () on the spool provide the limited axial movement in the sleeve. When lifted into the open position, metal flows into the spool flow conduit and through a porous structure of the spool, causing laminar flow and filtering inclusions.

Filtering check valve for metal casting

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Powell, OH, United States of America

Lee R Horvath