Due to the large number of impurities in the metal during mining, its physical and chemical properties are seriously unstable in use. Through heat treatment processing, it can effectively purify it and improve its internal purity. Heat treatment technology can also enhance its quality and optimize its actual use performance. Heat treatment technology refers to a process in which the workpiece is put in some medium for heating and reaches a certain temperature. After being kept at such temperature for a certain time, the workpiece is cooled at different speeds.
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As one of the most important treatment processes in material production, metal heat treatment technology has great advantages compared with other common processing technologies. In metal heat treatment, the "four fires" refer to annealing, normalizing, quenching (solution) and tempering (aging). When the workpiece is heated to a certain temperature, different holding times are used according to the size and material of the workpiece, and then the workpiece is cooled slowly. This is called annealing. The main purpose of annealing is to appropriately reduce the hardness of the material, improve the plasticity of the material, facilitate subsequent processing, reduce the residual stress, and evenly distribute the composition and structure of the material.
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Mechanical processing is a processing technology that uses machine tools to process parts. Mechanical processing will conduct corresponding heat treatment procedures before and after parts processing. Its function is:
1. Remove the internal stress of the blank. It is mainly used for castings, forgings and weldments.
2. Improve processing conditions to make materials easy to process. Such as annealing, normalizing, etc.
3. Improve the comprehensive mechanical properties of metal materials. For example, quenching and tempering treatment.
4. It can improve the hardness of materials. For example, quenching, carburizing quenching, etc
Therefore, in addition to reasonable selection of materials and various forming processes, heat treatment process is often essential.
Heat treatment generally does not change the shape and overall chemical composition of the workpiece, but endows or improves the working performance of the workpiece by changing the internal microstructure of the workpiece or changing the chemical composition of the workpiece surface. Its feature is to improve the internal quality of the workpiece, which is generally not visible to the naked eye.