[China Aluminum Network] annealing refers to the workpiece heated to the appropriate temperature, according to the size of the material and the workpiece using different insulation time, and then slowly cooling, its purpose is to reduce the hardness of the material, improve the plasticity, to facilitate the follow-up processing , Reduce residual stress, improve the homogenization of tissues and components. Annealing is divided into recrystallization annealing, stress-relief annealing, spheroidizing annealing, and full annealing depending on purposes. Normalizing heats the workpiece to a suitable temperature and then cools it in air. The effect of normalizing is similar to that of annealing, but the resulting structure is finer and is often used to improve the cutting performance of materials. Sometimes it is also used for parts that do not require high quality. The final heat treatment. Quenching is the rapid heating of the workpiece after heating and cooling in water, oil or other inorganic salts, organic aqueous quenching medium. After quenching, the material is an unbalanced structure, which is usually very hard and brittle. It requires a long-term heat preservation at a temperature higher than room temperature and then cooling. This process is called tempering (aging).
From the above definition, it can be seen that whether annealing, normalizing, quenching or tempering, the workpiece must be heated, kept warm, and cooled during the heat treatment. Therefore, in the heat treatment of aluminum profiles, the heating rate, holding time and cooling rate have become more important process parameters in the heat treatment process.
Aluminium profile heat treatment is a process in which aluminum profiles are heated to a suitable temperature in a certain medium, aluminum profiles heat-treated articles and information are kept at this temperature for a certain period of time, and then cooled at different speeds. Aluminum heat treatment is one of the more important processes in material production. Compared with other processing technologies, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the internal microstructure of the workpiece, or changing the workpiece The chemical composition of the surface imparts or improves the performance of the workpiece. Its characteristic is to improve the intrinsic quality of the workpiece, which is generally not observed by the naked eye. The “four fires†in the heat treatment of aluminum profiles refer to annealing, normalizing, quenching (solid solution) and tempering (aging).
In the "four fires", the relationship between quenching and tempering (ageing) is relatively close, and they are often used together. Both are indispensable. However, in actual production, in order to save costs and increase production efficiency, for products with low performance requirements, quenching is often replaced by quenching in-line quenching, and tempering is replaced by natural aging. For example, in the extrusion of 6060, 6063 and other low-alloyed alloy profiles, due to the low quenching sensitivity of these alloys, silicon, magnesium solid solution quickly above the solution temperature. Therefore, in order to ensure that the outlet temperature of the extrusion material is higher than the solution temperature, a supersaturated solid solution having a large solid solution degree can also be obtained by air-cooling and quenching.
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