What to do if there is a hard problem in aluminum alloy die-casting parts.8020 extruded

　　During the die-casting production process, it was found that hard spots may appear on aluminum alloy die-casting parts after production. For this reason, aluminum alloy die-casting factories have summarized this situation, which usually involves small particles or blocks with high hardness inside the aluminum alloy die-casting parts. This can make it difficult to process the castings, resulting in severe tool wear and even damage. After processing, hard spots of different brightness will gradually appear.

　　Why did this situation occur? In response to the problem of hard spots on the surface of aluminum alloy die-casting parts, aluminum alloy die-casting factories have made the following summary: firstly, the alloy is mixed with metals or non-metals that are harder than the base metal, such as free silicon; The second is the oxidation of aluminum alloy in air; Thirdly, the aluminum alloy was not refined well; The fourth is the addition of oxides during pouring; The fifth is a complex compound composed of manganese, silicon, iron, and aluminum, which is mainly suitable for forming MnAl3 in the colder part of the melt. With MnAl3 as the core, iron precipitates, and the participation of silicon also leads to the formation of the compound; The sixth reason is that the silicon content in aluminum silicon alloy is relatively high.

　　Since the cause of the hard spots on the casting has been identified, corresponding measures need to be taken to solve it. To this end, the following solutions are summarized: Firstly, do not excessively stir and heat during melting, and be sure to maintain the purity of the alloy liquid; Secondly, if aluminum alloys contain manganese, titanium, iron, etc., segregation should not occur and cleanliness should be maintained. Dry refining agents should be used for refining, and magnesium should be supplemented when the alloy contains magnesium; Once again, when aluminum alloys contain a significant amount of iron and copper, it is important to reduce the silicon content to below 10.5% and increase the pouring temperature appropriately to facilitate the precipitation of silicon

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