Most of the high-frequency quenching is used for surface quenching of industrial metal parts. The coil is connected to a high-frequency current to generate a high-frequency magnetic field. The induced current is generated in the ferromagnetic material. The induced current accumulates on the surface of the material to generate heat due to the skin effect. , to reach the phase transition temperature. The chilling reaches the purpose of quenching.

     Induction heating has completely different heating principles than other furnaces that conduct, convect or radiate the workpiece to the heating temperature. The basic principle is that the heating material (ie, the workpiece) is placed in a coil through which an alternating current is applied. Due to the action of the alternating magnetic field, an induced potential is generated inside the workpiece, and an eddy current is generated in the workpiece under the action of the induced potential. The energy of the eddy current reaches the purpose of heating.

     Induction heating equipment, that is, equipment that inductively heats a workpiece for surface hardening. Principle of induction heating: The workpiece is placed in the inductor. The inductor is usually a hollow copper tube with input intermediate frequency or high frequency alternating current (1000-300000 Hz or higher ) . The alternating magnetic field generates an induced current of the same frequency in the workpiece. The induced current is uneven in the distribution of the workpiece, strong on the surface, and weak inside, to the core close to 0 , using this skin effect The surface of the workpiece can be heated rapidly, and the surface temperature rises to 800-1000oC in a few seconds , while the temperature of the core changes little.