Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1992-10-20
1994-05-10
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164119, B22D 1804
Patent
active
053099753
ABSTRACT:
A split mold is closed to define a cavity. The mold has in its lower portion a gate communication with the cavity. A stoke is connected at its upper end to the gate, while its lower end is immersed in a bath of molten metal in a holding furnace. The pressure of the bath is increased, or the pressure of the cavity decreased, whereby the molten metal is introduced into the cavity. The molten metal in the cavity is allowed to solidify to yield a cast product. The product is cooled and removed from the mold. The stoke and the cavity are filled with an inert gas before the molten metal is introduced into the cavity. In order to introduce the molten metal into the cavity, a pressure difference is created between the bath and the cavity at a rate of 0.001 to 0.006 kgf/cm.sup.2 /s. The molten metal is kept at a temperature which is higher than its melting point by 50.degree. to 80.degree. C., or the mold is kept at a temperature of 350.degree. to 430.degree. C. The inert gas is also supplied into the stoke to separate molten metal therein from the solidified product. The surface of the separated molten metal in the stoke is kept above that of the molten metal in the holding furnace when the product is cooled and removed from the mold.
REFERENCES:
patent: 3961662 (1976-06-01), Balevski et al.
English Abstract of Japanese Patent Laid Open No. 48-49625.
Iizuka Yasuo
Konishi Yoshihisa
Ohnishi Nobuaki
Hitachi Metals Ltd.
Lin Kuang Y.
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