A mold is formed into the shape of a desired part. Molten metal is then poured into the mold, the mold then solidifies and a metal casting is created. Although this appears to be a simple process, the manufacturing process of metal casting can be considered a complex science.
There are many different metal casting processes used in the manufacture of parts. Two main methods can be distinguished by the basic nature of the mold they employ. There is expendable mold casting and permanent mold casting. As the name implies, expendable molds are used for only one metal casting while permanent molds are used for many.