Inhibiting shrinkage pipe formation of metal casting

Details Inhibiting shrinkage pipe formation of metal casting Inhibiting shrinkage pipe formation of metal casting

1983-04-27

1984-08-07

Godici, Nicholas P.

Metal founding

Process

Shaping liquid metal against a forming surface

164 61, 164122, 164125, 164493, B22D 710, B22D 2704

Patent

active

044637977

ABSTRACT:
A mold structure for casting large metallic parts such as ingots so as to avoid the formation of the "shrinkage pipe" which normally develops on the exposed top surface of such castings during their solidification comprises a cap for placement on a mold which includes a diaphragm having a front surface located to intercept radiation emitted from the top surface of the cooling metal mass and to re-emit radiation back thereto, and a reflector for returning radiation emitted from the back surface of the diaphragm such as an infrared reflector or a stack of baffles. The cap may include a cooler for cooling the reflective surface and suitable ports which allow the interior of the mold and cap to be evacuated. Portions of the mold adjacent its open top may be provided with insulation to prevent heat loss from the metal by conduction. A heater for providing make-up heat to the top surface of the metal mass may also be included in the structure.

REFERENCES:
patent: 3012296 (1961-12-01), Wiesner
patent: 4050668 (1977-09-01), Perri

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