Heating – Processes of heating or heater operation – Including preparing or arranging work for heating
Patent
1977-12-19
1979-11-20
Yuen, Henry C.
Heating
Processes of heating or heater operation
Including preparing or arranging work for heating
432258, 432261, 264 57, 2483461, F27D 500
Patent
active
041749502
ABSTRACT:
Disclosed is a preformed ceramic base useful in firing an open-ended ceramic shell mold having a mold base prior to metal casting. The ceramic firing base includes a working surface having a majority of flat surface portions for supporting the mold base during firing and one or more groove-like surface portions which define gas circulation passages from the outside atmosphere into the open mold bottom when the mold base is placed in supported relation on the flat surface portions. The ceramic firing base thereby enables firing of a green shell mold while maintaining mold base flatness and circulation of furnace gas into the mold cavity to minimize mold hot spots. Also disclosed is a preformed ceramic firing cap to be used in conjunction with the ceramic firing base, the firing cap being adapted to cover the open top end of the shell mold to prevent foreign particulate from entering the mold. The firing cap includes a working surface comprising a majority of flat surface portions for resting on the top of the mold and one or more groove-like surface portions extending from inside to outside the mold for purposes of gas circulation.
REFERENCES:
patent: 2148463 (1939-02-01), Harris
patent: 2450836 (1948-10-01), Levy et al.
patent: 2595961 (1952-05-01), Layne
patent: 3343774 (1967-09-01), Pryor
patent: 3352551 (1967-11-01), Kennedy
patent: 3778224 (1973-12-01), Duffner
patent: 3854186 (1974-12-01), Sergeys
patent: 3904356 (1975-09-01), Hill et al.
Nessler Charles G.
Timmer Edward J.
United Technologies Corporation
Yuen Henry C.
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