Cold chamber die casting is a preferred manufacturing process for metals that have high melting points like metal alloys of aluminium, brass and copper. Cold chamber machinery requires additional equipment — usually an outside furnace and a ladle to pour the metal into the machine.
Hot chamber machinery contains the alloy melting pot as part of the machine itself and uses a gooseneck to inject material from the pot into the die. Internals of the machine pair the plunger and port to control how much molten metal is injected into the die. When the port seals, the metal rests in the cavity to cool and solidify. Next, the plunger retracts and the casting itself can be removed once the die opens. This design allows hot chamber die casting to be a continuous process.
Hot chamber machinery is used for materials with lower melting points. Typical materials used in hot chamber die casting are zinc, lead and magnesium alloys.