ME 383 Test 2 Questions with Answers (100% Correct Answers)

ME 383 Test 2 Questions with Answers (100%
Correct Answers)


Expendable mold processes

Ans: mold is sacrificed to remove part


Permanent mold processes

Ans: mold is made of metal and can be used to make many castings


Examples of expendable mold processes

Ans: shell molding

expanded polystyrene

investment casting

plaster mold

ceramic mold


shell molding

Ans: Casting process in which the mold is a thin shell of sand held together by
thermosetting resin


expanded polystyrene

Ans: uses a mold of sand packed around polystyrene foam pattern which vaporizes when
molten metal is poured into mold


investment casting




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, Ans: A pattern made of wax is coated with a refractory material to make the mold, after
which wax is melted away prior to pouring molten metal


plaster mold casting

Ans: similar to sand casting except mold is made of plaster of paris


ceramic mold casting

Ans: similar to plaster-mold casting, except that the mold is made of refractory ceramic
materials that can withstand higher temperatures than

plaster


Examples of permanent mold casting processes

Ans: basic permanant mold casting

die casting

centrifugal casting


basic permanent mold process

Ans: uses a metal mold constructed of two sections designed for easy, precise opening and
closing


die casting

Ans: molten metal is injected into mold cavity under high pressure


hot-chamber die casting

Ans: Metal is melted in a container, and a piston injects liquid metal under high pressure
into the die


cold-chamber die casting

Ans: molten metal is poured into an unheated chamber from an external melting container,
and a piston is used to inject the metal under high pressure into the die cavity.




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