The four basic processes in the die-casting aluminum industry are annealing, normalizing, quenching and tempering. These four processes are called “four fires” in die casting. During the die casting process, the relationship between quenching and tempering is very close. Both are indispensable.
It is understood that annealing is to warm the workpiece. When heated to the proper temperature, the die casting is slowly cooled according to the material selected, and the internal structure of the metal is close to equilibrium. Normalizing is the process of heating the workpiece to a suitable temperature and then cooling it in the air. It is mainly used to improve the cutting function of the material. It can also be used for the end-casting of some parts that are not needed. Quenching is the rapid cooling of water in the quenching medium such as water or other inorganic salt solution after heating and heat preservation. After this process, the steel pieces will be hardened and the steel parts will become brittle. In order to reduce the brittleness of the steel, the quenched steel can be placed at a temperature below 650 degrees Celsius above a certain temperature for a long time of heat preservation, and then cooled, which is called tempering.
Aluminum materials and aluminum alloys have good fluidity and plasticity, so it is possible to make various types of complex and difficult die-casting parts. Castings cast with aluminum alloy and metal aluminum have high precision and surface finish, which is very large. To a lesser extent, the machining amount of the casting is reduced, the labor intensity is greatly reduced, and electric power and metal materials are saved. Because of its high intrinsic quality and external quality, aluminum die castings are widely used in various industries such as automobile manufacturing, internal combustion engine production, motorcycle manufacturing, electric motor manufacturing, transmission machinery manufacturing, precision instruments, garden beautification, electric power construction, etc. Become the new favorite of the die casting industry.