High-frequency and induction heating technology currently have high heating efficiency, fast speed, and low energy consumption for environmental protection. It has been widely used in thermal processing, heat treatment, thermal assembly, welding, smelting, and other processes of metal materials in various industries. It can not only heat the workpiece as a whole, but also locally heat the workpiece; it can achieve deep penetration of the workpiece, or it can only heat the surface and surface of the workpiece; it can not only directly heat the metal material, but also non-metallic The material is heated indirectly. and many more. Therefore, induction heating technology is bound to be more and more widely used in all walks of life.
Surface heat treatment process that uses induction current to locally heat the workpiece. This heat treatment process is often used for surface quenching, but also for local annealing or tempering, and sometimes for overall quenching and tempering.
Put the workpiece into the inductor (coil). When an alternating current of a frequency is passed into the inductor, an alternating magnetic field is generated around it. The electromagnetic induction effect of the alternating magnetic field causes a closed induction current-eddy current in the workpiece. The distribution of induced current on the workpiece cross-section is very uneven. The current density on the surface of the workpiece is very high and gradually decreases inward. This phenomenon is called the skin effect. The electrical energy of the high-density current on the surface of the workpiece is converted into thermal energy so that the temperature of the surface is increased, that is, the surface is heated. The higher the current frequency, the greater the difference in current density between the surface and the interior of the workpiece, and the thinner the heating layer. After the temperature of the heating layer exceeds the critical temperature of the steel, it is cooled rapidly, and surface quenching can be achieved.
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