ã€China Aluminum Industry Network】 Casting Aluminum Alloy Aluminum alloy and aluminum alloy castings can be obtained directly from the metal casting forming process. The content of alloy elements in this type of alloy is generally more than that of the corresponding deformed aluminum alloy.
The larger content of alloying element silicon in the cast aluminum alloy exceeds the silicon content of most deformed aluminum alloys. In addition to containing a strengthening element, the cast aluminum alloy must also contain a sufficient amount of eutectic elements, usually silicon, so that the alloy has considerable fluidity and is easily filled with shrinkage joints during casting.
Cast cracks are cracks formed at higher temperatures in the alloys with larger volumetric shrinkage and more complex shape castings tend to occur.
cause:
1. Casting structure design is irrational, there are sharp corners, the thickness of the wall changes too much difference 2. Sand type (core) concession bad 3. Local overheating of the mold. Pouring temperature is too high 5. Remove the casting from the casting mold prematurely. Heat treatment overheating or overheating, cooling rate overshoot solution:
1. Improve casting structure design, avoid sharp corners, wall thickness strives for uniformity, smooth transition 2. Take measures to increase the concession of sand type (core) 3. To ensure that all parts of the casting are solidified at the same time or in sequence, improving the design of the casting system 4. Properly lower the pouring temperature Control mold cooling out time 6. Thermal deformation method is used for casting deformation. Correctly control the heat treatment temperature and reduce the quench cooling rate
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