High pressure die casting

HOT CHAMBER HIGH PRESSURE DIE CASTING

This process is almost universally selected for high- pressure die-casting components in zinc alloys. Metal is melted in a crucible with a hollow protrusion on one side, (generally called a gooseneck), located into the entrance to the die. A force pump mechanism, which has one end submerged in the molten metal, injects the molten metal into the die.

A runner system allows the metal to enter the component cavity or cavities through one or more ingates. Overflow runners may be provided to improve integrity and surface finish as appropriate.

COLD CHAMBER HIGH PRESSURE DIE CASTING PROCESS

As aluminium and it’s alloys require such high temperatures during the diecasting process, the hot chamber process is not suitable. This is because most of the metal components used to push the molten metal in to the die can not be subjected to long periods at high temperatures. Accordingly molten metal, held in a separate furnace, is transferred by a ladle and poured into an extension tube, (generally called the shot sleeve), projecting from the entry point to the die. A plunger, acting along the sleeve, forces the metal into die.

A runner system allows the metal to enter the component cavity or cavities through one or more ingates. Overflow runners may be provided to improve integrity and surface finish as appropriate.

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