Reasons for surface irregularities of zinc alloy die castings

1. The surface irregularities of zinc alloy die castings may be caused by the formation of a very thin and incomplete metal layer when the molten metal of zinc alloy enters the cavity, which is compensated by the subsequent molten metal, which will produce trace.

2. There may also be problems with the die-casting mold itself, such as cracks, roughness, sharp corners, etc. on the surface. In addition, the temperature of the die-casting mold is too low, resulting in irregular surface, especially the core temperature, which has a greater impact.

3. The cross-sectional area of ​​the inner runner is too small and the position is improper to cause splashing, resulting in streaks on the surface of the casting that are consistent with the flow direction of the molten metal, which can be solved by adjusting the cross-sectional area or position of the inner runner.

4. The pressure acting on the molten metal is insufficient, the pattern is too much, the amount of paint is too much, and the preheating of the die-casting mold is insufficient. The solution is to properly select the paint and adjust the amount.

5. The zinc alloy contains too much iron content or too low silicon content, or the content of impurities such as lead, tin, cadmium, etc. exceeds the specified range.