ppt 3 Flashcards
Solidification process can be classified according to engineering material processed:
- metals
- ceramics, specifically glasses
- polymers and polymer matrix composites (PMCs)
draw classification of solidification process
refer notes
process in which molten metal flows by gravity or other force into a mold where it solidifies in the shape of the mold cavity
casting
Steps in casting:
- melt the metal
- pour it into a mold
- let it freeze
what are the parts made by casting?
big and small parts
engine blocks and heads for automotive vehicles, wood burning stoves, machine frames, railway wheels, pipes, bells, pump housings
big parts
examples of big part made by casting
engine blocks and heads for automotive vehicles, wood-burning stoves, machine frames, railway wheels, pipes, bells, pump housings
dental crowns, jewelry, small statues, frying pans
small parts
example of small parts made by casting
dental crowns, jewelry, small statues, frying pans
Casting is usually performed in a ___________.
foundry
Foundry is a factory equipped for:
- making molds
- melting and handling molten metal
- performing the casting process
- cleaning the finished casting
Workers who perform casting are called _____
foundrymen
is a container with cavity whose
geometry determines part shape
Mold
Actual size and shape of cavity must be slightly oversized to allow for ___________ of metal during solidification and cooling.
shrinkage
Molds are made of a variety of materials, including _____, ______, _____, and ______.
sand, plaster, ceramic, and metal
Two types of molds
open and closed molds
What is an open mold?
simply a container in the shape of the desired part
What is a closed mold?
in which the mold geometry is more complex and requires a gating system (passageway) leading into the cavity.
