Injection device for molding machines

Details Injection device for molding machines Injection device for molding machines

1974-12-13

1976-06-01

Husar, Francis S.

Metal founding

Means to shape metallic material

Pressure shaping means

164321, 164120, B22D 1730

Patent

active

039602010

ABSTRACT:
The invention concerns an improved injection device for molding machines with a cooling chamber for casting of non-ferrous metals and alloys. It is characterized by a two-part piston, one part of which slides freely and coaxially inside the other, forming a chamber in which a gas, neutral with respect to the metal to be cast, is compressed by the forward movement of the piston by virtue of a stop-pin, then liberated and expanded at the end of injection in a container of liquid metal where it causes a balancing force effect and improves the filling of the mold.
This device makes it possible to eliminate the "ramroddings" which occur in single-piston machines at the end of injection and to obtain cast products which are free of defects.

REFERENCES:
patent: 3344834 (1967-10-01), Hall et al.
patent: 3437130 (1969-04-01), Johnson et al.

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