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Manufacturing Technology: Theory and Problems, Second Edition by D. K. Singh

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CHAPTER 7

Various Casting Processes

PERMANENT-MOULD CASTING
  • It is also known as gravity die casting because of the fact that the molten metal enters the mould cavity under the action of gravity.
  • It uses metallic mould called die.
  • Because of stable nature of mould, it can be used to produce large number of castings with the same mould.
  • It can be used to produce dimensionally accurate castings with close dimensional tolerances.
  • The surface finish of the casting produced is very good.
  • It is useful for small size castings.
  • It is commonly employed for aluminium castings.
  • The rate of production is high.
  • The cast part is free from casting defects such as porosity, dirt and shrinkage.
SHELL-MOULD CASTING
  • It is a variation of sand-mould casting. ...

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