The Effect Of Air Bubbles On Aluminum Alloy Die Castings
Oct 05, 2024| First, the impact of air bubbles
Aluminum alloy die casting internal air bubbles will cause significant impact on product performance, appearance and production efficiency:
1. Mechanical properties decline:
- The existence of bubbles in the casting due to the existence of internal defects, its tensile strength, hardness and other mechanical properties decreased significantly, zui finally affect the service life and safety of the product. 2. appearance defects.
2. appearance defects:
- Bubbles are often manifested in the casting surface depressions or holes, which not only affects the aesthetic appearance of the castings, but also may affect the subsequent surface treatment processes, such as spraying or plating.
3. Higher production costs:
- Scrap due to air bubbles can lead to higher production costs, including raw material, labor and time costs. In addition, the need for subsequent remedial measures, such as rework and recasting, will also increase the burden on the enterprise.
Second, the bubble control measures
In order to effectively control the aluminum alloy die casting process bubble generation, can take the following kinds of measures:
1. optimize casting process parameters:
- According to the characteristics of aluminum alloy, reasonable adjustment of melting temperature, casting speed and other process parameters, so that the gas can be effectively discharged. At the same time, the use of better fluidity of aluminum alloy can help reduce the generation of gas bubbles.
2. Improve the mold design:
- When designing the mold, consider increasing the ventilation holes or using materials with good air permeability to ensure the effective discharge of gas. At the same time, regular cleaning and maintenance of the mold to keep the inside of the mold clean.
3. High efficiency melting equipment:
- Adopting highly efficient melting equipment and vacuum melting technology can effectively reduce the water and other volatiles in the aluminum alloy and reduce the formation of gas bubbles from the source.
4. Strict control of environmental conditions:
- Ensure that the environment of the foundry is dry and the temperature is stable, and use dehumidifiers and other equipment to improve the dryness of the air in the workshop. At the same time, maintain good ventilation to reduce the chances of bubble generation.
5. Material selection:
- Select aluminum alloy materials with high purity and low moisture content to reduce the risk of air bubbles. In addition, appropriate addition of degassing agent can further reduce the content of dissolved gas.