Metal founding – Process – Shaping a forming surface
Patent
1980-04-14
1982-01-26
Baldwin, Robert D.
Metal founding
Process
Shaping a forming surface
164 16, 164 21, B22C 912
Patent
active
043123970
ABSTRACT:
A pattern holder 12 and a sand tank 14 are rotatably mounted on a frame 16 so that the pattern holder can be inverted over and sealably mounted atop the sand tank. A vented pattern 26 is secured to the pattern holder and forms a first chamber between one side of the pattern and the interior of the pattern holder. A second chamber 90 is formed between the other side of the pattern and the interior of the sand tank when the pattern holder adjoins the sand tank. O-ring seals 32 and 80 isolate the chambers from the atmosphere so that a partial vacuum can be formed therein. A mixture 84 of sand and a gas-curable binder is provided in the sand tank so that the mixture will fall onto the pattern upon inverting the sand tank over the pattern holder. A flexible line 42 is provided for controllably introducing a gas catalyst into the chamber 38 in order to cure a portion of the sand-binder mixture to form a shell mold 94 of a predetermined thickness on a pattern face 36 of the pattern. Flexible lines 41 and 43 are provided for evacuating and purging the chamber 38 at different stages in the process.
REFERENCES:
patent: 2991521 (1961-07-01), Bryant et al.
patent: 4079773 (1978-03-01), Dunlop
patent: 4089363 (1978-05-01), Dunlop
patent: 4232726 (1980-11-01), Michelson
"Simpli-Mold", Dependable Shell Core Machine Inc., Portland, OR, Bulletin No. 124, Mar. 1973.
Harris David L.
Taylor Colin
Baldwin Robert D.
Dependable-Fordath, Inc.
Lin K. Y.
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