Metal for die casting

The metals used for die casting mainly include zinc, copper, aluminum, magnesium, lead, tin and lead tin alloys. Although pressed cast iron is rare, it is also feasible. Special die casting metals include Zamak, aluminum zinc alloy and American Aluminum Association standards: aa380, aa384, aa386, aa390 and AZ91D magnesium. The characteristics of die casting of various metals are as follows:

Zinc: the most easily die-casting metal. It is very economical to manufacture small parts, easy to coat, high compressive strength and plasticity, and long casting life.

Aluminum: light weight, complex manufacturing and thin-walled castings have high dimensional stability, strong corrosion resistance, good mechanical properties, high thermal conductivity and conductivity, and high strength at high temperature.

Magnesium: easy to machine, high strength to weight ratio, the lightest of commonly used die-casting metals.

Copper: it has high hardness and strong corrosion resistance. Among the commonly used die-casting metals, it has the best mechanical properties, wear resistance and strength close to that of steel.

Lead and tin: high density, high dimensional accuracy, can be used as special anti-corrosion parts. For public health reasons, this alloy cannot be used as food processing and storage equipment. An alloy of lead, tin and antimony (sometimes with a little copper) can be used to make manual type and bronzing in letterpress printing.

The upper mass limits for die casting using aluminum, copper, magnesium and zinc are 70 pounds (32 kg), 10 pounds (4.5 kg), 44 pounds (20 kg) and 75 pounds (34 kg), respectively.