Through the heat treatment process, the aluminum alloy die casting parts can obtain stable microstructure and geometrical dimensions of the parts, and refine the grains and improve the structure to improve the mechanical properties of the workpiece. 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.
Aluminum alloy die casting
Heat treatment process of aluminum alloy die castings:
1, softening annealing
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.
2, normalizing treatment
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.
3, quenching treatment
Quenching is the rapid cooling of the workpiece after heating and holding it in water, or from quenching media such as other inorganic salt solutions. After this process, the steel produced will become hard and the steel will become brittle.
In order to reduce the brittleness of the steel piece, the quenched steel piece can be placed at a temperature below 650 degrees Celsius above a normal temperature for a long time of heat preservation, and then cooled, which is called tempering.
The above is the relevant introduction of the heat treatment process of aluminum alloy die castings.