What are the effective principles of intermediate frequency induction furnace heating?

 A medium frequency induction furnace is a metal induction heating equipment, which is widely used in metal thermal processing in various industries, such as heating before forging, casting heating, metal quenching and tempering heating, hot stamping heating, hot extrusion heating, etc.

In the medium frequency induction furnace, the metal workpiece is put into the inductor coil of the medium frequency induction furnace and the frequency conversion current is generated through the medium frequency induction power cabinet and sent to the induction coil. This frequency conversion current with a certain frequency flows in the spiral copper tube of the induction coil, Produce alternating magnetic field. According to the right-hand rule of middle school physics, induced currents (eddy currents) with the same frequency and opposite directions will be generated inside the metal workpiece. According to Joule Lenz's law due to the flow of eddy currents, a certain amount of heat will be generated by the metal workpiece. This heat value has a square relationship with current and a linear relationship with time. This heat causes the metal workpiece to heat itself. This is the basic principle of medium frequency induction furnace heating

Four effects that affect the heating of medium frequency induction furnace

1. The first is the surface effect of the medium frequency induction furnace heating, which refers to the magnetic field formed when the alternating current passes through the conductor, and the self-induced electromotive force is generated on the conductor. It is opposite to the direction of the applied electromotive force, and the self-induced electromotive force is the strongest in the center of the cylindrical conductor and the weakest on the surface. Therefore, the current trends to the surface and the ferromagnetic parts are placed in the inductor. When the inductor passes high-frequency alternating current, eddy currents are generated on the surface of the parts. The strength of the eddy currents is the strongest on the surface, and the phenomenon is attenuated according to an exponential curve from the surface to the inside.

2. The proximity effect of the medium frequency induction furnace heating refers to the current on the conductor due to the interaction of the current between the adjacent conductors heated by the medium frequency induction furnace, such as the induction coil and the induction heating parts, when there is an alternating current passing through. The phenomenon of redistribution.

3. The ring effect of medium frequency induction furnace heating means that when the ring-shaped conductor passes high frequency (or medium frequency) AC current, the magnetic field generated is concentrated in the ring and dispersed outside the ring, so that the current passes through the inner surface of the ring conductor At this time, there is a larger self-induced electromotive force phenomenon outside the ring than the magnet wire inside the ring.

4. The sharp corner effect of the medium frequency induction furnace heating refers to the sharp corner of the metal the workpiece and the heating speed through the frequency conversion current will be faster than the heating speed of other parts.

The heating principle of the medium frequency induction furnace is basically the same as described above. Although there are various forms of heating by the medium frequency induction furnace, the heating principle of the medium frequency induction furnace is similar, and the principle of electromagnetic induction heating is the same as the above description.

Induction melting furnace,induction furnace manufacturers

评论

此博客中的热门博文

How to maintain the induction heating coil?