Reasons for Bubble Formation in Aluminum Alloy Die Castings

　　1. If the filling degree of the metal liquid in the injection chamber is too low, it is easy to generate air entrainment and the initial injection speed is too high.

　　2. The mold pouring system is unreasonable and the exhaust is poor.

　　3. The melting temperature is too high, the gas content is high, and the solution is not degassed

　　4. The mold temperature is too high and the flow time is not enough. Insufficient metal solidification time, insufficient strength, premature mold opening, and expansion of compressed gas.

　　5. Excessive use of release agent and injection head oil

　　6. The blowing time after spraying is too short, and the surface of the mold is not blown dry.

　　Preventive measures:

　　1. Adjusting the switching points of die-casting process parameters, injection speed, and high-pressure injection speed

　　2. Modify the mold runner and add overflow and exhaust channels

　　3. Reduce the mold temperature in the defect area. Thereby reducing the pressure effect of the gas

　　4. Adjusting the smelting process

　　5. Extend the mold retention time and adjust the blowing time after spraying

　　6. Adjusting the dosage of release agent and injection oil

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