Lost foam casting system with high yield sprue

Details Lost foam casting system with high yield sprue Lost foam casting system with high yield sprue

1987-02-17

1988-01-26

Lin, Kuang Y.

Metal founding

Means to shape a forming surface

Pattern

164246, 164 34, B22C 904, B22C 702

Patent

active

047211490

ABSTRACT:
A lost foam casting system (2) includes a sprue (8) have a receiving portion (56) for receiving molten metal (14) from a source (16), a distribution portion (58) with a plurality of radial fingers (59-62) for distributing the molten metal (14) radially outwardly, and a lower section (63) having a plurality of feed passages (35-38) receiving molten metal (14) from the respective radial fingers (59-62) and interconnected by thin flat support walls (39-42) providing a relatively rigid structure. Workpieces (18 and 20) and in-gates (23-25 and 26-28) are connected to the flat exterior surfaces (39 and 41) of the lower section (63) of the sprue (8) and fed with molten metal (14) from respective feed passages. The structure provides pattern assembly rigidity, excellent dimensional control, high casting yield, high ratio of casting weight to gating/sprue weight, high surface area to volume ratio facilitating escape of vapor and organic effluents, ease of pattern attchment by large outer flat sprue surfaces, accessibility of casting for ease in removal from the sprue, low total volume for reduction of buoyancy, and faster metal fill rates and faster cooling.

REFERENCES:
patent: 3861447 (1975-01-01), Hondo
patent: 3863706 (1975-02-01), Chandley
patent: 3900064 (1975-08-01), Chandley
patent: 4112997 (1978-09-01), Chandley
patent: 4340108 (1982-07-01), Chandley
patent: 4616689 (1986-10-01), Denis
Robert K. Buhr, "Panel: The Evaporative Foam Casting Process-Looking to the Future and New Technologies", Evaporative Foam Casting Technology II Program, Nov. 12-13, 1986, pp. 179-184.
Ezra L. Kotzin, "Metalcasting & Molding Processes", Cast Metal Series, An American Foundrymen's Society Publication, Des Plaines, Ill. 1981.

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