Die Casting


Die casting is the permanent mold metal casting process which uses very high pressure to insert the molten metal into the mold. The process was developed in 1900.

Types of die casting


  • Cold chamber die casting
  • Hot chamber die casting



Parts of die casting machine


  • Power cylinder (for closing die)
  • Stationary section (connected to base)
  • Guide rode (stationary)
  • Movement mechanism 
  • Movable plate (travel on guide rode)
  • Stationary plate (connected to base)
  • Movable die half
  • Fixed die half


Die Casting 
Machine



Steps involves in die casting

Step 1

Like all other metal casting process first process is the mold making. Mold of the die casting is consist of two parts one is fixed and other is movable. Molds are attached to the plates one of them move forward and backward for closing and opening the mold.

Step 2

Some lubricant is sprayed onto the walls of the die so the molten metal does not stick to the wall of the mold

Step 3

Two halves of the molds attached to the plates are closed with great force because when molten metal is added to the mold under pressure it will force the plates to move away. 

Step 4

When two halves of the die is closed then molten metal is forced in the mold at high pressure. Piston or plunger is used to force the molten metal into the die. The pressure is usually 1000 to 50000 psi

Step 5


Molten metal in the die is allowed to cool and when it is cool mold is open and parts are removed from the mold. Ejection pins installed in the mold help in the removal of the parts.


Advantages of die casting


  • Good tolerance
  • Good surface details
  • Thin walls can be manufactured
  • Parts manufactured have superior mechanical properties.
  • High production rate
  • Can be automated
  • Low labor cost
  • Suitable for mass production



Disadvantages of die casting


  • Vent holes need for the eliminating of the gases
  • Trimming is usually needed
  • Ejection pines have small marks on the surface of the part
  • Limited shapes and sizes
  • High cost



1 comments:

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