The application of aluminum material aluminum alloy in aluminum die casting has good fluidity plasticity, so it can make all kinds of complicated difficult die castings. The castings made of aluminum alloy metal aluminum have high precision surface finish, which greatly reduces the machining amount of castings, greatly reduces the labor intensity, saves power metal materials 。 Because of its high internal external quality, aluminum die casting is widely used in automobile manufacturing, internal combustion engine production, motorcycle manufacturing, motor manufacturing, transmission machinery manufacturing, precision instruments, landscaping, electric power construction, other industries, becoming the new favorite of the die casting industry.
The four base processes in die casting aluminum industry are annealing, normalizing, quenching tempering. These four processes are called "four fires" in die casting. In the process of die casting, the relationship between quenching tempering is very close, both of them are indispensable.
It is understood that annealing is to heat the workpiece. When it is heated to the proper temperature, the die-casting is cooled slowly according to the different materials selected, so that the internal structure of the metal is close to the balance. Normalizing is to heat the workpiece to a suitable temperature then cool it in the air. It is mainly used to improve the cutting function of materials, it can also be used to finish the die casting of some parts that need less. Quenching is the rapid cooling of the workpiece in water, by other inorganic salt solutions other quenching media after heating heat preservation. After this process, the steel produced will become hard brittle at the same time. In order to reduce the brittleness of steel parts, the quenched steel parts can be placed at a temperature below 650 ℃ higher than the normal temperature for a long time, then cooled, which is called tempering.