Medium frequency induction hardening power supply for automobile half shaft

The automobile half shaft is an important structural part of the automobile rear axle that receives torque and an impact force. It is one of the main components for transmitting power. During the working process, the torque transmitted from the main reducer and differential is finally transmitted to the driving wheels. That is to say, it plays the role of transmitting engine torque and driving the conical teeth of the rear axle to move the wheels forward. There is both sliding and impact force at the stressed part of the spline. The service life of the half shaft depends on the compression resistance of the splines, which requires high static torsional strength and torsional fatigue life, good fatigue resistance and impact toughness, etc., and a deep hardened layer, etc., to meet the requirements of the solid half shaft Normally, the most vulnerable part of the axle shaft is the connection between the rod and the flange.

Using medium frequency induction quenching power supply for quenching heat treatment is a surface strengthening technology to improve the service life of automobile half shafts. In a sense, it has the characteristics of simple operation, low cost, and easy to obtain good strengthening effects, and has been increasingly promoted and applied in automobile manufacturing. Generally, automobile half shafts use a ring inductor for continuous quenching and heating. In order to enhance the heating efficiency, silicon steel sheets and magnets are installed on the effective ring, and the notch is diagonally opposite to the flange fillet. The purpose is to use the notch effect to reduce the The intermediate frequency current delivered by the upper element of the effective circle is driven to the point corresponding to the fillet, where it is rapidly heated within 10 seconds, and a very reasonable surface hardening layer can be obtained.

The emergence of half-shaft surface integral quenching technology is a major advancement in induction quenching heating technology. This method improves production efficiency and saves energy. Since the effective direction during heating is parallel to the center line of the half-shaft, a transverse magnetic field perpendicular to the half-shaft axis is generated. Therefore, the dimensional change of the axle box will also cause the transfer of magnetic induction lines. Therefore, the rectangular induction longitudinal heating overall quenching technology has the following characteristics compared with the half-shaft continuous quenching: a. The production efficiency is high and it is easy to realize mechanization and automation. b. It is conducive to proximity effect heating and the heating layer is shallow, so the quenching deformation of the half shaft is small, and only 10% of the quenched half shaft needs to be straightened. c. The surface is heated evenly, without quenching cracks and uneven hardness. d. The power consumed by quenching is low e. The hardness of the spline tooth top is increased.