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Longitudinal continuous induction heating quenching

The basic principle of induction heating quenching Induction heating is mainly based on the three basic principles of electromagnetic induction, skin effect and heat conduction. When the alternating current passes through the conductor, an induced current is generated in the conductor under the action of the alternating magnetic field formed. The current intensity in the conductor is exponentially attenuated from the surface to the center, and the current is concentrated on a thin layer adjacent to the outer surface of the conductor. This phenomenon is called the alternating current skin effect. Induction hardening is the use of this skin effect to quickly heat and quench the surface of the workpiece.
 
The advantage of the continuous induction heating quenching process is that relatively long and large workpieces can be processed with a smaller power supply device, and the equipment has a small footprint and a low production cost. For a long time, the medium frequency continuous quenching mostly uses a circular continuous quenching inductor, and an induced current is generated in the workpiece in the circumferential direction. This process itself has a disadvantage that is difficult to overcome, and a non-uniform brittle hard layer occurs wherever the axial dimension of the workpiece changes. In order to solve the above problems and expand the application range of continuous induction heating quenching, we have experimentally studied the longitudinal continuous induction heating quenching method.

 

The effective part of the longitudinal continuous quenching inductor, the front part mainly plays the role of preheating, the transverse magnetic field is established, and the longitudinal induced current (eddy current) is generated in the workpiece, and the workpiece is heated to the temperature above the Curie point, but the rear part is installed but When there is a magnet, the workpiece is heated to the quenching temperature. This type of sensor completely utilizes the proximity effect of the intermediate frequency current to achieve heating of the workpiece. The sensor is equipped with an additional water spray device for quenching, and the workpiece rotates when heated and quenched.
 
When the inductor is located at the half shaft portion and the complete spline portion, the geometrical shape and shape of the left and right parts of the inductor are symmetrical, the magnetic lines of the current established in the inductor are evenly distributed, and the induced current generated in the corresponding part of the part is uniform, so heating It is also uniform. When the sensor is in the spline transition, the geometry of the part to the left of the sensor changes. According to the law of magnetic flux refraction, the magnetic lines of force established by the inductor current will shift.
 
Induction hardening is an important heat treatment method widely used in local surface strengthening of transmission parts to improve its surface wear resistance and load carrying capacity, and to accurately control the depth and microstructure of the hardened layer. Through the development and excavation of induction quenching equipment and process technology, strengthen the standardization construction, fully apply the process characteristics of induction quenching, enhance the strengths and avoid weaknesses, better compensate for the lack of carburizing and other surface strengthening processes, and promote the overall development of the industry, the prospects are very optimistic.
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