basic definition of castingsprocess in which molten metal flows by gravity or other force into a mold where it solidifies in the shape of the mold cavity
the term casting also applies to the part made in the process
steps in casting seem simple:
melt the metal
pour it into a mold
let it freeze
capabilities and advantages of castingcan create complex part geometries
can create both external and internal shapes
some casting processes are net shape; others are near net shape
can produce very large parts
some casting methods are suited to mass production
disadvantages of castingdifferent disadvantages for different casting processes:
limitations on mechanical properties
poor dimensional accuracy and surface finish for some processes; e.g., sand casting
safety hazards to workers due to hot molten metals
environmental problems
parts made by castingbig parts: engine blocks and heads for automotive vehicles, wood burning stoves, machine frames, railway wheels, pipes, church bells, big statues, and pump housings
small parts: dental crowns, jewelry, small statues, and frying pans
all varieties of metals can be
cast, ferrous and nonferrous
cast structures of metals
silica sol investment casting process:
design and analysis of gating system for pump casingdesign of gating system is vital in any molding or casting processes, in order to get defect free components. as far as the casting of
pump casing is concerned, finding the “hot spot” is very important, as most of the casting defects occur at the “hot spot”. “hot spot” is the part of casting that gets solidified last. the “hot spot” usually occurs at the thickest cross section of the casting. by simulation, the most appropriate location is selected for incorporating the gating system (gate, sprue, runner and riser) so that the “hot spot” will be shifted to the riser and hence we get defect free components.
