Plaster mold casting is a metalworking casting process similar to sand casting except the molding material is plaster of paris instead of sand. Like sand casting, plaster mold casting is an expendable mold processes, however it can only be used with non-ferrous materials. It is used for castings as small as 30 g (1 oz) to as large as 45 kg (99 lb). Generally, the form takes less than a week to prepare. Production rates of 1–10 units/hr can be achieved with plaster molds.
Parts that are typically made by plaster casting are lock components, gears, valves, fittings, tooling, and ornaments.
... Plaster casting is similar to sand casting except that plaster of paris is substituted for sand as a mold material ... after which a production rate of 1–10 units/hr·mold is achieved, with items as massive as 45 kg (99 lb) and as small as 30 g (1 oz) with very good surface finish and ... Plaster casting is an inexpensive alternative to other molding processes for complex parts due to the low cost of the plaster and its ability to ...
... Plaster mold casting is used when an excellent surface finish and good dimensional accuracy is required ... Because the plaster has a low thermal conductivity and heat capacity the metal cools more slowly than in a sand mold, which allows the metal to fill thin cross-sections the minimum ... This results in a near net shape casting, which can be a cost advantage on complex parts ...
... The master record was melted, then taken out of the mold to reveal a negative of the grooves in the metal ... The master mold is used to create "mothers" and these are then further processed to make working molds ... The molds with mandrels placed in the center were heated and dipped in a tank of the molten wax ...
Famous quotes containing the words casting, plaster and/or mold:
“All we know
Is that we are a little early, that
Today has that special, lapidary
Todayness that the sunlight reproduces
Faithfully in casting twig-shadows on blithe
Sidewalks. No previous day would have been like this.”
—John Ashbery (b. 1927)
“My father upon the Abbey stage, before him a raging crowd.
This Land of Saints, and then as the applause died out,
Of plaster Saints; his beautiful mischievous head thrown back.”
—William Butler Yeats (18651939)
“indolence read as abnegation,
slattern thought styled intuition,
every lapse forgiven, our crime
only to cast too bold a shadow
or smash the mold straight off.”
—Adrienne Rich (b. 1929)