GB1001979A - Device for feeding molten metal to a die-casting machine - Google Patents

Abstract

1,001,979. Dispensing measured quantities of liquid. ZAVODY ELEKTROTEPELNYCH ZARIZENI (ZEZ), NARODNI PODNIK. Jan. 7, 1963 [Jan. 6, 1962], No. 764/63. Heading B8N. [Also in Division B3] A device for feeding molten metal to the feed chamber of a pressure die-casting machine has a valve controlling the filling of the device with molten metal, said valve comprising three coaxial tubes 4, 5, 6, the central tube 6 being in the form of a vertically movable piston closed at its upper end and made of a non-metallic substance of lesser specific gravity than the liquid metal, the inner tube 4 opening at its lower end into a bath of molten metal, and the outer tube 5, the length of which determines the maximum charge fixed with its lower end into the body 1 of the device. When immersed in the bath of molten metal with the connection 7 open to the atmosphere, the metal levels in the bath and the device equalize at 8, the plunger 6 floating in molten metal. A preliminary pressure is then applied through the connection 7, causing the level in the device to drop to 9 at the top of the tube 5, the level in the tube 5 to drop to 12 at which level the piston 6 seals the outlet, and the level in the discharge pipe 3 to rise to h 1 , a position of equilibrium. The feed pressure is then applied through connection 7 for a predetermined period, causing the level 9 to fall to 10 as metal is displaced through the discharge pipe 3. The connection 7 is then made to atmosphere and the device refills, all liquid levels again becoming equalized.