To cast a metal means to shape it by melting it then pouring it into a mold. As the metal cools and solidifies, it adopts the shape of the mold that surrounds it, and once it is completely cool it can be withdrawn. When they want to make cast aluminum products, manufacturers can choose between several methods. One of these is called die casting.

In die casting, the manufacturer melts the aluminum then forces it into a steel mold at high pressure. The mold is called a die and is made from alloy tool steel divided into two or more sections. One of these sections is called the cover half and remains fixed; the ejector half, by contrast, is removed once the aluminum has solidified, at which point the final product is ejected. The steel mold rapidly conducts heat away from the aluminum so the cooling process is quite rapid.

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