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06

2023-08

Pay attention to details in the production of alloy castings

Category: Industrial News

In recent years, there are more and more alloy die-casting manufacturers. In the era of rapid technological development, mechanical equipment is also constantly being updated. There are more and more situations where mechanical castings are in short supply, so there are so many die-casting manufacturers.

Defects are mainly protruding vesicles on the surface of the mold. Polished or machined to expose after fuel injection or plating.

The cause of foaming defects in castings is that the pores are mainly caused by pores and shrinkage mechanisms, and the pores are often circular and shrink irregularly. The cause of the porosity is that during the filling and solidification process of the molten metal, the inner surface or inner hole of the casting is invaded by the volatile gas of the coating produced by the gas intrusion.

When solidifying, the gas content of the alloy liquid is too high.

When the gas in the cavity, the gas emitted by the paint, and the gas solidified by the alloy, when the mold is exhausted, the pores formed in the casting can remain.

Zinc alloy die castings are widely used in various aspects such as decoration, furniture accessories, architectural decoration, bathroom accessories, lighting accessories, toys, tie clips, belt buckles, metal buckles, and high-demand casting surface quality, which requires a good surface treatment. A common defect of zinc alloy die castings is surface blistering.

The reason for shrinkage is that during the solidification process of molten metal, the liquid shrinks due to the decrease in volume or final solidification position.

The uneven thickness of the casting or the local overheating of the casting will cause slow solidification in a certain part, volume shrinkage and surface depression.

Due to the porosity and shrinkage of the castings during surface treatment, the pores can enter the water baking paint and post-plating baking, the quality of the die casting depends on the precision of the processing equipment, the gas in the hole is heated and expanded; or the water in the hole will change the volume of the steam to expand Causes blistering on the surface of the casting.

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