In a hot chamber die casting machine

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WBPSC JE Mechanical 2018 Official Paper
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  1. melting pot is separate from the machine.
  2. melting pot is an integral part of the machine.
  3. melting pot may have any location.
  4. high temperature and pressure is used.

Answer (Detailed Solution Below)

Option 2 : melting pot is an integral part of the machine.
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Detailed Solution

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Concept:

Die casting:

It is a moulding process in which the molten metal is injected under high pressure and velocity into a split mould die.

Die casting is categorized two types namely -

  • Hot chamber and cold Chamber.
  • In a hot chamber die casting machine melting pot is an integral part of the machine.
  • Metals like Zinc, tin, and lead alloys are cast in hot chamber die casting having melting point below 390°C whereas aluminum alloys are cast in cold chamber die casting machine.
  • Most die castings are made from non-ferrous metals, specifically zinccopperaluminiummagnesiumleadpewter, and tin-based alloys.
  • The higher the cooling rate, the finer will be the grain and higher will be the strength.
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