How does an intermediate frequency heating furnace work

Author : hongteng Time : 2021-04-22

Intermediate frequency heating furnace is an induction heating equipment for the purpose of heating metal forging or tempering heat treatment. It is generally used for heating before forging and the heating temperature is 1200 degrees, while the heating temperature for tempering heating is generally within 1000 degrees.This intermediate frequency heating application determines that the heating principle of intermediate frequency heating furnace is only for heating purpose and cannot melt metal.Therefore, if heating furnace in the structure, in principle is different from other forms of heating furnace, next we will talk about if heating furnace principle.

1. The principle of intermediate frequency heating furnace is based on electromagnetic induction heating and follows the electromagnetic effect theory, such as electromagnetic ring effect, skin effect, sharp Angle effect, proximity effect, diathermy effect, conduction effect, etc.

2. Intermediate frequency furnace is mainly composed of variable frequency device and induction coil, power frequency 50 hz alternating current frequency conversion device would turn into intermediate frequency 100 hz - 10000 h of alternating current, the three-phase alternating current into direct current (dc) after rectifying power frequency, and then laid adjustable intermediate frequency electric current, direct current supply by the capacitor and inductor in the flow of intermediate frequency alternating current, generate high density magnetic field lines in the induction coil, induction coil, and cutting in cheng fang of metal materials, produce a lot of eddy current in the metal materials.

3. The frequency conversion device and induction coil of the intermediate frequency heating furnace make the heated metal material produce eddy current, which also has some properties of the intermediate frequency current, that is, the free electrons of the metal itself flow in the metal body with resistance to produce heat., for example, put a metal cylinder has alternating medium frequency current in induction coil, metal cylinder has no direct contact with induction coil, electric coil temperature is very low, but the surfaces are heated to redness, and even melt, and the redness and melting speed as long as adjust the size and the strength of the current frequency can be achieved.If the cylinder is placed in the center of the coil, the temperature around the cylinder is the same, and the heating and melting of the cylinder does not produce harmful gases or light pollution to the environment. 

To sum up, the basic principle of if heating furnace electromagnetic induction, the whole heating principle around the electromagnetic effects of various electromagnetic to design if heating furnace heating.

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