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What should I do if there are pores on the surface of zinc alloy die casting?
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Zinc alloy die-castings are prone to pore defects. Stomata usually include invasive pores, warped skins, less meat, and flames, and are mainly distributed on the upper surface or inner cavity of the die-casting.The presence of pores can greatly reduce the mechanical properties of the die-casting part. In addition, the presence of pores can reduce the compactness of the die-casting part.
The surface of the zinc alloy die-casting has a complicated shape and uneven wall thickness. Even if the overflow riser is designed, the neck of the overflow riser is slender and the exhaust area is small. The gas cannot be completely discharged from the riser neck. In the overflow riser, pores and oxidized inclusions are formed on the uppermost surface of the die-casting part. Due to the large amount of oxidation of the molten iron during the flashback process, oxidation inclusions remain in the casting. At the same time, the air bubbles generated in the molten aluminum during the die casting process move to the upper surface and stay there to form the inner cavity pores.
Increasing the pouring temperature by 40 ° C can ensure that the formation time of the oxide film is delayed as long as the shrinkage defect does not occur in the die casting, and the gas can effectively overflow. Therefore, when solving pore defects, especially http://www.tmetalparts.com/die-cast-parts/241.html die-casting parts that are prone to pores, raising the pouring temperature is a more effective solution.
The cause of the pores is the release of gas. Eventually the gas stays in the form of bubbles in the zinc alloy die-casting to form pore defects, which are often manifested as pores such as pores, flames, local depressions, and warping. How to effectively solve the problem of pores is often considered by zinc alloy die-casting factories, but the solutions are often one-sided.
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