Analysis of Common Defects in Zinc Alloy Die Castings

1. The surface of zinc alloy die casting has patterns and traces of metal flow:1. The flow channel leading to the casting inlet is too shallow.2. The specific pressure of the injection is too large, causing the metal flow rate to be too high, causing splashing of the metal liquid.Adjustment method:1. Deepen the gate runner.2. Reduce the specific pressure of injection.   2. Causes of small bumps on the surface of zinc alloy die castings:1. Rough surface.2. There are scratches or pits or cracks on the surface of the mold cavity.Adjustment method:1. Polishing the cavity.2. Replace the cavity or repair it.   3. There are push rod impressions on the surface of the casting, and the surface is not smooth and smooth. The cause of roughness is:1. The pusher rod (ejector rod) is too long;2. The surface of the cavity is rough or contains debris.Adjustment method:1. Adjust the length of the pusher lever.2. Polishing the cavity to remove debris and oil stains.   4. Causes of cracks or local deformation on the surface of zinc alloy die castings:1. The ejector rods are unevenly distributed or the number is insufficient, and the force is uneven:2. The pusher rod fixing plate is deflected during work, resulting in a large force on one side and a small force on the other side, causing deformation and cracks to occur on the product.3. The casting wall is too thin and will deform after shrinking.Adjustment method:1. Increase the number of ejector rods and adjust their distribution positions to make the casting ejection force balanced.2. Adjust and reinstall the push rod fixing plate.