Vacuum moulding flask

Details Vacuum moulding flask Vacuum moulding flask

1984-05-21

1986-02-04

Hoag, Willard

Metal founding

Means to shape a forming surface

Including means applying vacuum directly to mold material

164 71, 425388, 425405R, 425504, B22C 902

Patent

active

045679320

ABSTRACT:
In a vacuum moulding flask, air is removed by suction from the flask, which has been filled with moulding sand, in order to consolidate the mould. To ensure satisfactory distribution of the vacuum, suction pipes are disposed inside the flask and the suction tubes must be resistant to the thermal and mechanical stresses during moulding. The suction surfaces are either cylindrical or plane and are covered by parallel, substantially triangularly-shaped profile wires so arranged as to define narrow nozzle-shaped gaps through which the air can be sucked away.

REFERENCES:
patent: 26793 (1860-01-01), Smith et al.
patent: 791111 (1905-05-01), Du Pont
patent: 1768365 (1930-06-01), MacFarlane
patent: 3825058 (1974-07-01), Miura et al.
patent: 3861447 (1975-01-01), Hondo
patent: 4009747 (1977-03-01), Miura et al.
patent: 4233017 (1980-11-01), Lucas et al.

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