Surface peeling is a common problem in the production process of aluminum alloy die castings. This phenomenon not only affects the appearance of the product, but may also reduce its performance.
Insufficient clamping force of the die casting machine: If the clamping force of the die casting machine is not enough, the aluminum liquid may break the skin during the solidification process due to the inadequate clamping, resulting in a skin layer on the surface.
Incomplete mold cleaning: If there is residue in the mold cavity or injection chamber, the flash may enter the cavity, causing the peeling position to be unstable, and the position of each mold will be different.
Wear of the injection chamber and punch: When the injection chamber and punch are worn, the aluminum liquid may form a chilled hardening layer in the injection chamber, resulting in a lack of meat or excess meat on the product, and there may also be block and flaky stratification at the inner gate.
We can take the following measures to improve the peeling phenomenon:
Increase the casting temperature of aluminum liquid: Properly increasing the casting temperature of aluminum liquid will help reduce the occurrence of peeling.
Maintain mold temperature balance: Use a dual-circuit die-casting mold temperature controller to control the mold at a constant temperature, which can reduce temperature fluctuations and thus reduce peeling.
Increase the fullness of the injection chamber: Ensure that the injection chamber is full of aluminum liquid, reduce gaps, and help reduce peeling.
Increase the slow pressure speed: Properly increase the slow pressure speed to reduce the residence time of aluminum liquid in the injection chamber, thereby reducing peeling.
Properly increase the thickness of the material cake: Increasing the thickness of the material cake can reduce the flow resistance of aluminum liquid in the injection chamber, which helps to reduce peeling.
Reduce the amount of punch coating: Properly reducing the amount of punch coating can reduce coating residue, thereby reducing peeling.
Increase the temperature of the pressure chamber: Properly increasing the temperature of the pressure chamber can reduce the chilling and hardening of aluminum liquid, which helps to reduce peeling.
Replace worn injection heads and injection chambers: For severely worn injection heads and injection chambers, timely replacement can reduce the occurrence of peeling.