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Analysis of Common Bad Causes of Zinc Alloy Precision Die Castings
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In the era when die casting technology is very mature, the application field of zinc alloy die castings has also become very extensive. Due to the convenience of zinc alloy precision die casting molding, strong plasticity, and high processing efficiency, zinc alloy precision die castings are currently widely used in various electronic enclosures and Accessories, communication accessories, handicrafts, decorative parts, such as furniture parts, car remote control, home decoration, bathroom parts, lighting parts, etc., so the surface quality of the castings requires high glue, and zinc alloy precision die castings have good surface treatment properties.However, the most common defects of zinc alloy precision die castings are surface foaming. The foaming is divided into die casting foaming, electroplating foaming, spraying foaming and other processing technology defects. For the above common defects, according to zinc alloy precision die casting The blistering experience of the pieces is summarized and analyzed, specifically divided into the following aspects:
1. At the beginning of product design of zinc alloy precision die-casting parts, it is necessary to consider the feed inlet, slag discharge port and exhaust setting of the mold. Because the flow path of the feeding and slagging products is smooth, there is no air entrapment, no water marks, and no dark bubbles, which will directly affect whether the electroplating of the subsequent process is blistered. The products of die-casting by qualified feeding and slagging molds have a smooth and white surface , No water marks.
2. The tonnage, pressure, and number of mold cavity ejection of the mold mounting machine should also be considered during mold development.
3. The polishing liquid on the surface of the pre-treatment, the polishing paste and the oxide layer are not cleaned, and the surface of the product after rolling and polishing is often brighter. The employees in the pickling process of the electroplating plant pickle it casually, resulting in surface adhesion. The buffing agent is not cleaned and often blisters. In addition, the quality of the buffing agent selected by the buffing and polishing plant is also very important. Some surfactants in the buffing agent are extremely difficult to remove.
4. The product is immersed in alkali copper (usually referred to as the copper bottom). Before the plating tank, the product surface still has an oxide film (acid-washed film). The dewaxing and degreasing film has not been cleaned, so the film removal is critical. Early years It can also be removed by anti-staining salt. Now environmental protection strictly investigates the discharge of wastewater containing anti-staining salt. It is recommended to use LJ-D009 stripping powder. The effect is better than the anti-staining salt. It can also remove the nickel layer and the COD emissions meet national standards.
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