A hot-chamber die casting machine is shown in Figure 20.20. This machine is used with alloys of low melting points because of the difficulties encountered such as increased corrosion of the machine parts at high temperatures. Since many metals have an affinity for iron, only those casting alloys are used that do not attack the immersed metal parts. Alloys of zinc, tin, and lead are particularly recommended for these machines.
Figure 20.20 Hot-chamber Die Casting Machine
In the hot-chamber die casting method, the melting pot is included within the machine and the injection cylinder is immersed in the molten metal. The injection cylinder is actuated by either air or hydraulic pressure, which forces the metal into the die cavity. The metal is held under pressure until it solidifies. The improved die design and rapid cooling can reduce cycle time.
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