slim profile aluminium windows.Solution for Hard Spot of Die Casting Parts in Die Casting Mold Factory

　　Hard spots in die-casting parts are a common casting defect encountered by die-casting mold factories during the processing. There are small particles or blocks on the castings that have a hardness higher than the metal matrix, namely oxide inclusions or slag inclusions. Hard spots can cause severe tool wear, increase the difficulty of processing, and after processing, more hard spots of different brightness will appear on the die-casting parts.

　　Hard points are divided into two types: non-metallic hard points and metallic hard points. They pose varying degrees of harm to die castings. Why do die castings have hard points? The reason for the formation of non-metallic hard points is: 1. The oxide on the surface mixed with the alloy liquid. 2. Aluminum alloy is poured on the liquid surface of the plate. 3. A mixture of alloy liquid and release agent was mixed in. 4. Mixed with a mixture of alloy liquid and refractory materials. The reason for the formation of metal hard spots is: 1. Mixing with crystalline materials for producing intermetallic compounds. 2. Dissolved silicon element material. For non-metallic liquids, solutions include removing oxides from tools such as spoons and using coatings that do not react chemically with aluminum. The solution for molten metal is to control the content of impurities in the alloy composition, and when adjusting the alloy composition, do not directly add silicon element. Intermediate alloys must be used.

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