Casting

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Casting

• Mukul Gupta
• ID20195018
• 4M-L

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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

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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

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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

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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

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References

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