How Induction Hardening Works

Induction quenching is to place the workpiece in an inductor made of copper tube, and a certain frequency of alternating current is passed into the inductor, and an alternating magnetic field with the same frequency will be generated around the inductor, so the same frequency will be generated in the workpiece. The induced current, this current forms a loop in the workpiece, called eddy current. This eddy current can turn electrical energy into thermal energy to heat the workpiece. Youzao Energy believes that the distribution of eddy currents in the workpiece is uneven, the surface density is large, and the core density is small. The higher the frequency of the current passing through the inductor, the thinner the surface layer where the eddy currents are concentrated, this phenomenon is called the skin effect. Due to the skin effect, the surface of the workpiece is rapidly heated to the quenching temperature, and then cooled by water spray, and the surface of the workpiece is hardened.

Induction hardening frequency can be divided into ultra-high frequency, high frequency and medium frequency quenching types. We need to choose the frequency of quenching according to different metal products.