Foundry mixture and related methods for casting and cleaning cast metal parts
AssigneeNewton Engine Corporation
InventorsJohn E. Hoffman, Jr., Richard A. Hoffman, Sr.
Life of this patent
Estimating the term…
Abstract
A foundry mixture for making molds used for molding cast metal parts includes foundry sand, a non-aqueous binder, and a cleaning agent that includes calcium oxide. Residual foundry mixture remaining on the cast part after removal from the mold is removed by electrolytic cleaning of the cast part.
Claims15
A foundry mixture capable of forming a rigid mold for molding a cast metal part without adding water to the mixture, the foundry mixture consisting of:
- a granular refractory material consisting of sand, a resin binder material, and a cleaning agent, the cleaning agent consisting of calcium oxide;
- and
- the resin binder material being curable without using water to form a rigid non-aqueous binder matrix rigidifying the mold, the resin binder material being of the type that does not react with the calcium oxide during curing so that the calcium oxide remains as calcium oxide after curing of the resin binder material.
A foundry mixture capable of forming a rigid mold for molding a cast metal part without adding water to the mixture, the foundry mixture consisting of:
- a granular refractory material consisting of sand, a resin binder material, an additive, and a cleaning agent, the cleaning agent consisting of calcium oxide;
- the additive selected from one or more of the following groups (a), (b), (c), and (d):
- (a) a reducing agent consisting of at least one of the following:
- coal powder, pitch, creosote, and fuel oil;
- and
- (b) a cushioning material consisting of at least one of the following:
- wood flour, saw dust, powdered husks, peat, and straw;
- (c) a dry strength agent consisting of at least one of the following:
- dextrin, starch, sulphite lye, and molasses;
- (d) a refractoriness agent consisting of at least one of the following:
- iron oxide powder, silica flour, and zircon flour;
- the resin binder material being curable without using water to form a rigid non-aqueous binder matrix rigidifying the mold, the resin binder material being of the type that does not react with the calcium oxide during curing so that the calcium oxide remains as calcium oxide after curing of the resin binder material.
Dependencies are inferred from the claim text.