Casting - PowerPoint PPT Presentation

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Casting

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Expendable mold casting: Sand Casting. Plaster casting (of metals) Plaster casting (of plaster or concrete) Shell molding. Investment Casting ... – PowerPoint PPT presentation

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Title: Casting


1
Casting
  • Mukul Gupta
  • ID20195018
  • 4M-L

2
Casting
  • A manufacturing process used to solidify objects
    from their liquid form into various useful shapes
    by introducing a fluid melt into a mold.
  • Four main elements
  • Pattern
  • Mold
  • Cores
  • the part

3
Subdivisions of Casting
  • Expendable mold casting
  • Sand Casting
  • Plaster casting (of metals)
  • Plaster casting (of plaster or concrete)
  • Shell molding
  • Investment Casting
  • Nonexpendable mold casting
  • Permanent Mold Casting
  • Die Casting
  • Centrifugal casting
  • Continuous casting

4
Cooling rate
  • The rate at which a casting cools affects it
    microstructure, quality, and properties
  • Slower Cooling
  • Increases the metal's grain size
  • Resluting in a coarse microstructure
  • allows more gases and waste metal to escape,
    reducing the voids and inclusions that can weaken
    a casting
  • Faster Cooling
  • resulting in a fine microstructure with small
    grain and less alloy segregation
  • more trapped gases and inclusions

5
Shrinkage
  • The shrinkage caused by solidification can leave
    cavities in a casting, weakening it.
  • Risers provide additional material to the casting
    as it solidifies
  • Add Costs
  • Why does shrinkage occurs
  • Metals are less dense as liquids than as solids,
    castings shrink as they cool

6
References
  • http//en.wikipedia.org/wiki/CastingCasting_in_ma
    nufacturing
  • http//en.wikipedia.org/wiki/Riser_28casting29
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