High frequency hardening

High-frequency quenching is a metal surface treatment technology that uses high-frequency induction to heat the metal surface and then rapidly cool it to change the structure and properties of the metal. The principle can be summarized as follows:

1. High-frequency induction heating: the first step of high-frequency quenching is to use the principle of high-frequency electromagnetic induction to heat the workpiece surface above the quenching temperature through the induction heating coil to make the surface form a high temperature state. The use of high-frequency induction can heat the metal to the quenching temperature in a very short time, effectively improving production efficiency.

2. Rapid cooling: After the metal surface reaches the quenching temperature, it needs to be cooled rapidly to form martensitic tissue. Water spraying, oil spraying or water immersion is usually used for rapid cooling, so that the metal surface temperature rapidly drops, thereby promoting the formation of martensite.

3. Martensitic transformation: During the quenching process, the metal is transformed from austenitic structure to martensitic structure, which will lead to a substantial increase in the hardness and strength of the metal. Martensite has high hardness and good wear resistance, which can improve the service life and performance of the metal.

4. Metallographic structure improvement: high-frequency quenching can not only improve the hardness and strength of the metal, but also optimize its metallographic structure. By controlling the cooling rate and quenching temperature, the formation of metallographic structure can be controlled, the metal surface can be refined grains, and the wear resistance and fatigue resistance can be improved.

In general, high-frequency quenching is an efficient metal surface treatment technology, by using the principle of high-frequency induction heating and rapid cooling, can significantly improve the performance and durability of the metal, widely used in automotive manufacturing, machining, aerospace and other fields, to improve product quality and extend the service life plays a key role.