Three Common Causes of Die Casting Porosity. Die casting porosity is an inevitable kind of defect that metal casting companies encounter. With mass production of metal casting parts, such defect is proven to be difficult to avoid even for big manufacturers.
What is die casting porosity? Die casting porosity is the formation of tiny pockets of void spaces within a metal casting part. These spaces contain gas which was normally formed after the metal casting part has cooled down.
If you wonder what causes this kind of defect, this article will give you three common causes of die casting porosity.
1. Aggressive Mixing.
During the process of mixing hardeners and casting resins, you must avoid inducing air into the mixture. You can use mixers from Jiffy Mixer line because it is said that their machines induce less air than other mixers. The most effective way to remove air due to the mixing process is to degas or de-air the mixture inside a vacuum chamber before you proceed to pouring.
2. Injection temperature
In die casting, injection is the process when the molten metal is pushed, using high pressure, into the die or mold. If the injection temperature is too high, chances are, the die casting part will form air bubble because the casting resin will boil.
3. Cooling rate
Air bubbles within the die casting parts are sometimes caused by non-uniform cooling rate. The cooling rate depends from the maximum wall thickness of the mold, the thermodynamic properties of the metal used and also the complexity of the mold itself.
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