THE PRESSURE ZINC DIE CASTING PROCESS: MATERIALS
Pressure die casting with zinc-based alloys is one of the most efficient and versatile high-production methods used for the manufacturing of strong, accurate, complex and intricately shaped metal components.
The process is carried out in an automatic machine suitable to withstand high pressure. The molten metal is pushed by a hydraulically actuated plunger into a two-piece steel die containing one or more cavities, each an exact inverse replica of the part or parts being produced. Because of the quick chill and rapid solidification that takes place when molten metal comes in contact with the relatively cool steel side, and because the fine metallurgical grain structure that results, the mechanical properties of pressure die castings are generally superior to castings produced by other methods.
Zinc pressure die castings, for example, are stronger than sand cast 356-T6 aluminum, SAE 40 bronze, and class 30 cast iron. Also, pressure die cast components produced using the ZA alloys are stronger than pressure die cast aluminum 380 alloy.
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