Die Casting / HIGH pressure die casting

 So just what is this metal-working process?

We are going to explain it right here.

 

 

High-pressure die casting is a process wherein molten metal is forced, under pressure, into a sealed mould cavity. It is held in place by a powerful compressive power (true die installed in hydraulics machine) until the metal solidifies.

Following solidification, the die is released, opened and the metal is released.

Following removal, the mould cavity is resealed for the next cycle.

Molten metal injection into the mould cavity occurs in a fraction of a second (usually under 100 ms). One time die cavity is filled, extremely high pressure is applied (often over 1000 bar) into a molten metal true injection plunger. This phase is called intensification.

This pressure compresses out any gases trapped in the metal (during extremely fast and turbulent cavity filling) and feeds more metal into the mould to partially compensate for the shrinkage in the metal whilst it is solidifying.

In addition to traditional high-pressure die casting methods, over recent years there have been a number of improvements in the process. For example:

• vacuum die casting
• semisolid casting
• squeeze casting

 

 

• Dimensional accuracy
• Low machining allowance
• Thin walls
• High strength
• Good surface quality
• High productivity due to high automation
• Leak tightness as long as the casting skin is not machined
• Sprue parts possible

 

 

In order to inject molten metal into the mould, two different systems may be used:

1. a hot chamber system
2. a cold chamber system