Aluminum alloy die casting is currently the most widely used among various casting methods. However, problems such as shrinkage stress, phase transformation stress, and thermal stress may occur during the production process of aluminum alloy die castings. These problems will directly affect the quality of aluminum alloy die castings. Quality & Stability. So how should aluminum alloy die-casting factories eliminate stress in aluminum alloy die-casting parts and improve the quality and stability of aluminum alloy die-casting parts?
The cause of stress is generally that the die-casting part is hindered by the mold and core during molding and produces tensile stress. This stress is temporary. Secondly, due to the gas getter, aluminum alloys easily absorb the gas. The higher the hydrogen content, the more pores will be. The pores not only reduce the air tightness and corrosion resistance of the casting but also reduce the mechanical properties of the alloy.
In order to solve these problems, excellent aluminum alloy die-casting factories will generally start from the following aspects:
1. Design a reasonable structure
When designing aluminum die castings, take the thermal expansion coefficient of the alloy and type into consideration to reduce shrinkage and stress. In addition, attention should be paid to the surface smoothness and length after processing to ensure that the processed aluminum alloy die-casting parts meet the specifications and performance requirements.
2. Annealing treatment
Residual stresses in cast aluminum parts can be eliminated by annealing. Because the alloy has good thermal conductivity and no phase change during cooling, the residual stress of aluminum castings is generally small as long as the casting structure is designed reasonably. When performing annealing treatment, the constant and cooling temperatures should be ensured to be uniform to avoid deformation or cracks in the aluminum alloy die castings.
3. Refining process
Refining liquid aluminum can effectively control the hydrogen content in the liquid aluminum. During the casting process, adding covering agent protection and refining the melting conditions can effectively reduce the amount of air intake in aluminum alloy die castings, thus reducing the possibility of pore formation.
4. Optimize the casting process
In the production process of aluminum alloy die castings, reasonable casting processes are also very important. The temperature, fluidity and mixing degree of the aluminum liquid should be ensured before casting. This can be achieved by preheating the aluminum liquid, injecting it at high pressure, and adding a degassing agent. In addition, the composition of the alloy and the adjustment of casting temperature and cooling conditions should also be paid attention to.
5. Use advanced tools and equipment
The use of advanced tools and equipment allows for better control over the quality and stability of aluminum alloy die castings. For example, die-casting intelligent control systems and automated production equipment can improve the accuracy and surface quality of aluminum alloy die-casting parts, thereby reducing the occurrence of residual stress, shrinkage cavities, and other problems.
To eliminate stress in aluminum alloy die-casting parts and improve the quality and stability of aluminum alloy die-casting parts, it is necessary to start from many aspects, including rational design of the structure, annealing treatment, refining treatment, optimization of the casting process, and the use of advanced tools and equipment. Only by comprehensively applying these methods can the quality and stability of aluminum alloy die castings be ensured to the greatest extent.
Aluminum alloy die-casting is a widely used material. During the production process, problems such as shrinkage stress, phase transformation stress, and thermal stress may occur, affecting its quality and stability. However, taking appropriate solutions, such as the rational design of the structure, annealing treatment, and refining treatment, can eliminate the stress in aluminum alloy die castings and improve their quality and stability.