Metal founding – Means to apply vacuum directly to work or to hold or...
Patent
1989-12-21
1990-11-13
Lin, Kuang Y.
Metal founding
Means to apply vacuum directly to work or to hold or...
164 61, 164 34, B22C 904, B22D 2715
Patent
active
049695053
ABSTRACT:
A vacuum chill device is provided for reducing porosity in a bore wall of a lost foam metal casting. In a preferred embodiment, the chill device is attached to a vaporizable pattern formed of polystyrene or the like and includes a vacuum chamber received in a bore defined by the pattern. The pattern and chill device are embedded in a body of unbonded sand particles or the like, whereupon the refractory body extends therebetween. The vacuum chamber is connected to a vacuum line that leads outside the mold and includes screened orificies through which the vacuum chamber communicates with the surrounding refractory body. During casting, pattern decomposition vapors venting into the bore are drawn through the orifices into the vacuum chamber and exhausted through the vacuum line. Removal of the hot vapors from the bore by the vacuum device accelerates solidification of the bore wall to reduce shrink porosity therein.
REFERENCES:
patent: 3557867 (1971-01-01), Kryzanowski
patent: 3581802 (1971-06-01), Krzyanowski
patent: 3741281 (1973-06-01), Hauser-Lienhard
patent: 3861447 (1975-01-01), Hondo
patent: 4139045 (1979-02-01), Vitt
patent: 4520858 (1985-06-01), Ryntz, Jr. et al.
patent: 4706732 (1987-11-01), Ruhlandt et al.
Fekete Douglas D.
General Motors Corporation
Lin Kuang Y.
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