1. Work features: adopt longitudinal and transverse composite magnetic field induction heating and quenching;High heating efficiency, high speed, only 6 seconds/piece;Hardness distribution of hardened layer is uniform;Low power consumption;The tooth surface edge is consistent with the middle part;The hardened layer of tooth root can be precisely controlled.Small deformation.2. Working principle: connect the high-frequency power supply, the electric contact and the inductor into a circuit, and the sample above the inductor becomes the induced heating body.In this way, the surface of the workpiece is heated not only by the longitudinal magnetic field, but also by the transverse magnetic field, to achieve the purpose of uniform heating.Replace different inductor, can heat different shape of workpiece surface.Compared with the traditional high frequency heating, the workpiece surface heating current is more concentrated, the density is larger, the heating speed is faster.With this method, the power density of heating workpiece surface is several times that of traditional induction heating.3, precision rack quenching process: on the inductor, the cylinder drops, press the rack, the induction electrode, the rack and the sensor are connected, the distance between the sensor and the rack can be adjusted according to the need.The induced current generated by the combination of vertical and horizontal magnetic fields heats the tooth surface at the same time. The heating speed is very fast. The heating time is controlled.