High pressure die casting or HPDC
Block diagram of HPDC process is shown below, molten metal is poured into the cylinder where the piston force the molten metal to flow into the mould cavity.
Once the poured metal inside the mould cavity get cold and take shape the die halves got opened and the moulded component come out. And the process continues.
Low Pressure Die Casting or LPDC
Working of LPDC process is explained through the block diagram below:
Here, the molten metal (3) is forced by the pressure of gas passed through the pipe (10) into the mould cavity (11) against the gravitational force. Once the mould cavity is sufficiently filled and the component got cooled enough, the die halves (1 &2) got opened and the moulded part got ejected out.
|Production cost / unit||Low||High|
|Suitable for||Al & Zi alloys, Component with high surface finish
low fatigue strength: carburetor, distributor bodies,
switch gear housing etc.
|Al & Zi alloys, Component with low surface finishhigh fatigue strength: auto wheels, gearbox,
electric motor stator etc.