Permanent Mold Casting

Permanent mold casting is metal casting process that employs reusable molds ("permanent molds"), usually made from metal. The most common process uses gravity to fill the mold, however gas pressure or a vacuum are also used. A variation on the typical gravity casting process, called slush casting, produces hollow castings. Common casting metals are aluminum, magnesium, and copper alloys. Other materials include tin, zinc, and lead alloys and iron and steel are also cast in graphite molds.

Typical parts include gears, splines, wheels, gear housings, pipe fittings, fuel injection housings, and automotive engine pistons.

Read more about Permanent Mold CastingProcess, Advantages and Disadvantages

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Casting (metalworking) - Non-expendable Mold Casting - Permanent Mold Casting
... Permanent mold casting is a metal casting process that employs reusable molds ("permanent molds"), usually made from metal ... The most common process uses gravity to fill the mold, however gas pressure or a vacuum are also used ... A variation on the typical gravity casting process, called slush casting, produces hollow castings ...
Permanent Mold Casting - Advantages and Disadvantages
... The main advantages are the reusable mold, good surface finish, and good dimensional accuracy ... the ease of inducing directional solidification by changing the mold wall thickness or by heating or cooling portions of the mold ... The fast cooling rates created by using a metal mold results in a finer grain structure than sand casting ...
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... silicate, alcohol, and a gelling agent to create a mold ... the item used to create the shape of the mold) is used ... Then a torch is used to ignite the mold, which causes most of the volatiles to burn-off and the formation of ceramic microcrazes (microscopic cracks) ...

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    New York was a new and strange world. Vast, impersonal, merciless.... Always before I had felt like a person, an individual, hopeful that I could mold my life according to some desire of my own. But here in New York I was ignorant, insignificant, unimportant—one in millions whose destiny concerned no one. New York did not even know of my existence. Nor did it care.
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