Aluminum die casting process introduction
Though the term die casting can refer to any kind of casting using a die such as gravity die casting or low pressure die casting, yet here die casting only refer to high pressure die casting. Aluminum die casting is a process of casting Aluminum alloy under pressure, which can produce precision parts in high volume at low costs. There are two processes of aluminum die casting namely hot chamber die casting and cold chamber die casting. Parison die casting introduced cold chamber die casting process from1980's. Now the die casting machines which Parison die casting is applying are cold chamber die casting machines.
Advantage of aluminum die casting process
A.high volume but low cost Compared with aluminum sand casting and gravity casting, aluminum die casting can produce precision parts in high volume at low costs.
B.good surface finish and good dimensional accuracy Aluminum die casting generally has good surface finish and good dimensional accuracy. For many parts, post-machining can be totally eliminated, or very light machining may be required to bring dimensions to size.
Disadvantage of aluminum die casting process
A.high cost of die casting mold The cost of tooling of die casting is much more expensive than those of sand casting, gravity casting and investment casting.
B.high porosity Though the porosity of die casting can be adjusted by using much higher pressure with a much larger and heavier mold, the porosity can not be avoided and is much more than that is of low pressure casting and gravity casting. Furthermore,porosity leads die casting parts to be not suitable for heat treatment.Thus the consistence can not be compared with gravity castings.
FAQ's of aluminum die casting process
- what is aluminum die casting process?
- what is the cold chamber die casting process?
- what is the difference between cold chamber and hot chamber die casting process?
- What is application of die casting process?
- what kinds of metal can be applied in die casting process?
- why is cold chamber die casting process preferable for aluminum casting rather than hot chamber die casting process?
- what is the application of die casting products?
- what kinds of post treatments can be available for aluminum die casting products?
- what is the difference between aluminum high pressure die casting and low pressure die casting?
- what is gravity die casting? Is it the same as high pressure die casting process?
Illustration of cold chamber die casting process
In a cold chamber die casting process, the molten aluminum alloy is ladled into the cold chamber for each shot. There is less time exposure of the melt alloy to the plunger walls or the plunger. This is particularly useful for aluminum alloy that alloys easily with Iron at the higher temperatures.
After the molten aluminum alloy is ladled in to the cold chamber, the piston will inject it into the cavity of the die casting mold through three different pressure phrases. The pressured molten aluminum alloy gets in sequence through spure system, running system and gate system into the cavity of the die casting mold.
The filled cavity with affection of cooling system shapes the desired aluminum die casting products. Then the moving die moves away from the fix die, while the ejectors push out the casting.
