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How to prevent defects caused by aluminum castings

How to prevent defects caused by aluminum castingsHow to prevent defects caused by aluminum castings

The defects of aluminum castings are mainly manifested as
1. The casting structural design is unreasonable, with sharp corners, and the wall thickness of the casting changes too much
2. Sand mold (core) has poor yield
3. Local overheating of the mold
4. Pouring temperature is too high
5. Premature removal of castings from the mold
6. The heat treatment is overheated or overfired, and the cooling rate is excessive
Methods for preventing defects of aluminum castings
1. Improve the structural design of castings, avoid sharp corners, strive for uniform wall thickness, and smooth transition
2. Take measures to increase the concession of the sand mold (core)
3. Ensure that all parts of the casting are solidified simultaneously or sequentially, and improve the design of the pouring system
4. Properly reduce pouring temperature
5. Control the mold cooling time.
6. The thermal correction method is adopted when the casting is deformed.
7. Correctly control the heat treatment temperature and reduce the quenching cooling rate

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