Aluminum alloy die casting is generally a casting process method in which high temperature molten aluminum alloy metal liquid is injected into a mold cavity through high pressure and high speed injection. This casting method is relatively precise in forming and has high production efficiency.
The die-casting process generally has defects, because the gas in the mold cavity cannot be effectively eliminated during high-speed injection, and these gases will remain in the casting, thereby forming porosity defects, which will lead to poor mechanical properties of the casting. Generally in order to solve this problem, most people will use the vacuum method, that is, the gas in the cavity is extracted during die casting to form a certain vacuum and negative pressure state to reduce the porosity defects in the casting.
In order to improve the mechanical properties of die-casting parts, people have been researching new die-casting methods, such as laminar flow filling method, oxygen-filled die-casting method and vacuum die-casting method. These methods are aimed at reducing the gas entrainment during the filling process of the molten metal, thereby improving the mechanical properties of the casting.
Because laminar flow filling method has certain problems of low production efficiency, the oxygenated die casting method has the disadvantages of complicated operation procedures, difficult to control process parameters, etc. Generally, these two methods are not particularly applied. The vacuum die-casting principle is to extract the gas in the cavity, and the metal liquid fills the cavity under a vacuum state, so less gas is involved, and the mechanical properties of the casting can be rapidly improved.
Vacuum die casting is easy to operate and does not reduce production efficiency. Therefore, vacuum die casting has shown strong vitality since its emergence. With the development of related technologies, its application will become more and more widespread.