Most aluminum and aluminum die castings can be plated (including galvanized and chrome plated). Although technically more complex than steel, copper and copper alloy coatings, they are technically mature and have been put into production and application in large quantities. For example, the upsetting head of automobile wheels is electroplated on aluminum alloy die castings. China has become the largest country and the largest country for aluminum wheel upsetting. Big exporter. Because of the structural problems of die-casting aluminum alloy products, it is easy to produce sand holes with high silicon content and difficult electroplating.
Aluminum alloy die casting is a casting process from high temperature molten aluminium alloy and high pressure and high speed injection moulding to the cavity.
The casting method has the characteristics of high accuracy and high production efficiency.
However, the traditional die casting process has defects, because the gas in the die cavity can not be effectively eliminated in the high-speed injection process, and air holes are left in the castings, resulting in poor mechanical properties of the castings. In order to solve this problem, people use the vacuum method, that is, in the process of die casting, the gas in the cavity is pumped out to form a certain vacuum or negative pressure state, so as to reduce the porosity defects in the casting.
The service life of the die is a comprehensive reflection of the performance of the die material, the design of the die, the processing and heat treatment process, the use and maintenance of the die in a certain period of time. Therefore, more and more attention has been paid to the research on the life characteristics and failure mechanism of dies. It is very important for die casting production to study the failure of die casting die and improve the service life of die casting die.