Die Casting Porosity and Its Causes. Die Casting porosity is one of the most common defects in the die casting manufacturing industry. What is die casting porosity? Die Casting porosity is a kind of die casting factory imperfection in which the die cast parts have tiny spaces which covers air within the metal – henceforth, the die cast parts become porous. The porosity of die casting parts could weaken the parts itself if the spaces or voids are very big.
To clearly understand the causes of the porosity one must know the basic of the die casting procedure. In a nutshell, die casting procedure includes molding molten metal by placing it inside a short cylinder, and then a great force is applied by a piston connected on the cylinder, pushing the molten metal so it would take the form of the die cast die or die cast mold. During this process, the metal is forced along with the air inside of the cylinder to the die casting mold.
Die casting porosity could be added by several factors like the following:
Die casting machine pressures.
Temperature of the metal and the mold.
The cleanliness of the materials used.
Design of the die casting mold.
Design of the die casting part.
The shot speed of the die casting machine utilized.
Die casting mold release or die casting spray
Die casting manufacturers use metals that are non-ferrous or metals that don’t have iron. It is because iron content is the chief reason for oxidation and rusting. Non-ferrous metals include magnesium, tin, lead, copper, zinc and aluminum.
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