Method and apparatus for sand moulding composite articles with a

Details Method and apparatus for sand moulding composite articles with a Method and apparatus for sand moulding composite articles with a

1988-06-07

1989-12-26

Seidel, Richard K.

Metal founding

Process

Shaping liquid metal against a forming surface

164112, 164119, 164309, 164306, 164334, B22D 1902

Patent

active

048891770

ABSTRACT:
The invention relates to a method and apparatus for sand molding composite articles formed of a light alloy metal and fibrous insert. A sand mold is formed containing a fibrous preform separated from the walls of the mold cavity. The mold is fed by means of a tube dipping into a liquid metallic bath therebelow. In the molding process, the pressure in the mold cavity and above the bath are reduced, and the pressure above the bath is increased to create a positive pressure differential .DELTA.P, thereby forcing molten metal from the bath into the mold cavity. The pressure in the mold cavity and above the bath are then increased to above atmospheric, and the pressure differential .DELTA.P is maintained until the metal in the mold cavity solidifies.

REFERENCES:
patent: 4050503 (1977-09-01), Balevski et al.
patent: 4252173 (1981-02-01), Charbonnier

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