Metal founding – Means providing inert or reducing atmosphere
Patent
1987-10-26
1988-10-18
Lin, Kuang Y.
Metal founding
Means providing inert or reducing atmosphere
164312, B22D 1704
Patent
active
047779985
ABSTRACT:
The invention relates to an apparatus for pressure casting of metal parts which possibly contain fibres of ceramic material. The apparatus includes a cold chamber, and comprises a lower fixed plate 1, an upper movable plate 2, and a die 3 disposed between the upper plate and the lower plate, with the lower plate being provided with an injection means for liquid metal comprising an injection sleeve 5 having a piston 6 supported on a rod 7 slidable in the sleeve. The metal is contained in a sealed vessel connected to the injection sleeve by a conduit 9 by way of an orifice 8 in the sleeve, with a gas inlet in the vessel connected to a source of gas for selectively placing the liquid metal in the vessel under a gas pressure P2 which causes the flow of liquid metal in the conduit towards the sleeve. A second gas inlet is located in the conduit near the orifice, this second gas inlet able to selectively create a gas pressure P1 in a pocket adjacent to the inlet, depending on the position of the piston and the gas pressure P2.
REFERENCES:
patent: 3980125 (1976-09-01), Portalier
patent: 4633930 (1987-01-01), Behrens
Aluminium Pechiney
Lin Kuang Y.
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