Common Faults and Exclusion Methods of Aluminum Die Casting Molds
Aluminum die castings are widely used in various industries due to their low cost and good performance. However, during the molding process, there are sometimes many faults, which will affect the quality of the molding. Therefore, we need to be familiar with the common faults of aluminum die casting molds and corresponding exclusion methods, so as to ensure the quality of the molding and reduce the production cost.
Common faults and exclusion methods of aluminum die casting molds are as follows:
1. Burn marks. This is caused by high excessive injection speed and temperature of molten aluminum. The solution is to reduce the temperature of the molten aluminum, reduce the injection speed, properly adjust the die casting time, and add a reasonable amount of protective agent to the alloy.
2. Cold marks. Cold marks are caused by the cold die or insufficient die casting pressure, the solution is to adjust the die casting pressure, or select a higher die casting temperature, or take other measures to improve the temperature of the die.
3. Porosity. Porosity is usually caused by improper selection of aluminum alloy, low pressure, low temperature, impurities in molten aluminum, etc. The solution is to choose the correct alloy, adjust and control the die-casting parameters, and reduce impurities in the aluminum.
4. Sand pipe. Sand tube is usually caused by sand adhesion on the surface of the die cavity or gate, so bleeding will occur. Solution is to polish the surface of the die cavity and gate with an emery cloth, clean up sand accumulation, and reduce the amount of sand to avoid sand adhesion on the surface of the die cavity.
5. Oxidation. Oxidation is usually caused by poor insulation of the mold or too high temperature of molten aluminum. The solution is to choose the corresponding insulation device to settle the temperature of molten aluminum or reduce the temperature of molten aluminum.
6. Cracks. Cracks are usually caused by excessive pressure or too fine mold parts, so we should choose the right pressure and reasonable structure shape of the mold parts.
To sum up, the common faults and exclusion methods of aluminum die casting molds have been introduced above. In actual aluminum die casting mold production, operators should pay attention to die casting process parameters and operation methods, and make reasonable and accurate adjustments according to the actual operation requirements, so as to ensure the stable quality of aluminum die casting products.
