Induction Melting Furnace Working Principle

The induction melting furnace working principle is that the power supply device converts the power frequency 50HZ alternating current into the medium frequency (from 300HZ to 1000HZ), converts the three-phase power frequency alternating current into the direct current after rectification, and then converts the direct current into the adjustable medium frequency current, supplies the medium frequency alternating current flowing through the capacitor and the induction coil, generates high-density magnetic lines in the induction coil, and cuts the metal material contained in the induction coil, producing a large eddy current in the metal material.

The working frequency of the induction melting furnace (hereinafter referred to as the induction furnace) is between 50 and 10 Hz, and is widely used for smelting non-ferrous metals and ferrous metals. Compared with other casting equipment, the medium-frequency induction furnace has the advantages of high thermal efficiency, short melting time, less burning loss of alloy elements, wide melting materials, small environmental pollution, and accurate control of the temperature and composition of molten metal.

Induction Melting Furnace Working Principle

The induction melting furnace is mainly composed of a power supply, induction ring, and crucible made of refractory materials in the induction ring. The crucible contains a metal charge, which is equivalent to the secondary winding of the transformer. When the induction coil is connected to the AC power supply, an alternating magnetic field will be generated in the induction coil, and its magnetic line will cut the metal charge in the crucible, and the induction electromotive force will be generated in the charge. Since the charge itself forms a closed circuit, the secondary winding is characterized by only one turn and is closed. Therefore, the induction current is generated in the furnace charge at the same time. When the induction current passes through the furnace charge, the furnace charge is heated to promote its melting.

When the magnetic flux surrounded by the conductor loop changes, the induced potential will be generated in the loop. Similarly, a conductor in an alternating magnetic field also generates an induced potential under the action of electromagnetic induction and forms an induced current (eddy current) in the conductor. The induced current overcomes the resistance of the conductor itself and generates joule heat. This heat is used to heat the conductor itself, make it warm and melt, and achieve various purposes of thermal processing. This is the principle of medium-frequency induction heating.

The electric induction furnace uses the medium-frequency power supply to establish the medium-frequency magnetic field, which makes the ferromagnetic material produce induced eddy current and heat, so as to achieve the purpose of heating the material. The induction melting furnace uses a 200-2500Hz medium-frequency power supply for induction heating, smelting, and heat preservation. The medium-frequency electric furnace is mainly used for smelting carbon steel, alloy steel, and special steel, and also for smelting and raising the temperature of copper, aluminum, and other non-ferrous metals. The electric induction furnace equipment is small in size, light in weight, high in efficiency, low in power consumption, fast in melting and heating, easy to control the furnace temperature, and high in production efficiency.

Multi-application of Induction Melting Furnace

(1) Heating forging of standard parts;

(2) Melting of various metal materials;

(3) Motor rotor heating matching;

(4) Heating expansion of steel pipe end;

(5) Mold diathermy;

(6) Shaft-type medium frequency quenching;

(7) Weld preheating or tempering after welding, etc.

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