The use of alternating current to produce alternating magnetic field, alternating magnetic field to produce eddy current to make the metal workpiece heat rapidly. In the induction heating process, the temperature rises only the metal part of the heated workpiece Induction heating is fast and clean for batch work. The heater can heat the whole bearing, can also heat the rings of cylindrical roller bearings and needle bearings separately, or heat other regular ring parts, such as labyrinth seals, couplings and tires The induction heater is designed to heat bearings that fit with the interference of the shaft. The heating causes the bearing to expand, and the mechanical installation force is no longer required during installation. the amount of expansion required for installation is sufficient We recommend applying a layer of universal bearing grease to the surface where the horizontal and vertical yoke contact each other, which not only reduces the magnetic field loss, but also significantly reduces the noise level Induction heater is widely used in metallurgy, railway, oil field, machinery, motor many manufacturing, maintenance machinery process bearing, gear, bushing, shaft sleeve, diameter ring, pulley, shrink ring, connector a variety of ring hole shaped metal parts heating