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Hot Chamber Machines

Hot chamber machines are used primarily for zinc, copper, magnesium, lead and other low melting  point alloys that do not readily attack and erode metal pots, cylinders and plungers. The injection mechanism of a hot chamber machine is immersed in the molten metal bath of a metal holding furnace. The furnace is attached to the machine by a metal feed system called a gooseneck. As the injection cylinder plunger rises, a port in the injection cylinder opens, allowing molten metal to fill the cylinder. As the plunger moves downward it seals the port and forces molten metal through the gooseneck and nozzle into the die cavity. After the metal has solidified in the die cavity, the plunger is withdrawn, the die opens and the casting is ejected.

The operating sequence of the hot-chamber standard die casting process
The die is closed and the piston rises, opening the port, allowing molten metal to fill the cylinder.
Next, the plunger seals the port, pushing the molten metal through the gooseneck and nozzle into the die cavity where it is held under pressure until it solidifies.
The die opens and the cores, if any, retract. The casting remains in only one die half – the ejector side. The plunger then returns, allowing residual molten metal to flow back through the nozzle and gooseneck.
Ejector pins push the casting out of the ejector die. As the plunger uncovers the filling hole, molten metal flows through the inlet to refill the gooseneck.

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