Moulding flask for vacuum sealed moulding process

Details Moulding flask for vacuum sealed moulding process Moulding flask for vacuum sealed moulding process

1974-11-26

1976-04-27

Shore, Ronald J.

Metal founding

Means to shape a forming surface

Including means applying vacuum directly to mold material

164 7, 164170, 164 37, 164379, 164253, B22C 1522

Patent

active

039527930

ABSTRACT:
Moulding flask adapted to be used in a process for forming a mould comprising steps of disposing, at the opening of the moulding flask, a pattern having a shield membrane of synthetic resin on the outer surface thereof, filling the space defined between the moulding flask and the pattern with particulate filler material such as sand, and applying negative pressure to the filler material so that the filler material is subjected to an external pressure to make a mould, said moulding flask having at least one surface on an intermediate partition surface formed by an impervious resilient membrane which is supported by a support member whereby, when the filler material is subjected to the negative pressure, the external pressure is applied to the resilient membrance which then presses the filler material so as to enhance compacting of the mould thus producing a strong and precise casting mould.

REFERENCES:
patent: 2962776 (1960-12-01), Taccone
patent: 3156958 (1964-11-01), Miller et al.
patent: 3861447 (1975-01-01), Hondo
patent: 3872915 (1975-03-01), Nokota et al.

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