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| Casting Pouring a molten metal, or mixture of molten metals, into a mold where it is allowed to solidify is called casting. Two types of molds are used: single-purpose and permanent molds. Single-purpose molds have to be specially prepared, sometimes by machines, from patterns. Using metal or permanent molds offers many advantages where the process is applicable. For example, the constantly repeated cost of sand molding is eliminated; but the initial cost of the metal mold or die is high. The cost is justified only when the same casting is required in great numbers. However, for many metals, the metal mold has a distinct advantage: the structure and strength that result from the relatively rapid solidification in a metal or chill mold. For the nonferrous metals, chill casting is quite practical, especially with some aluminum alloys.
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| Curriculum design: David L. Heiserman Publisher: SweetHaven Publishing Services |
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