Introduction to induction furnace

Induction furnace is an electric furnace that uses the induction electric heating effect of materials to heat or melt materials. The main components of induction furnace are inductors, furnace body, power supply, capacitors and control system.
The main components of induction furnace are inductors, furnace body, power supply, capacitors and control system.
Under the action of the alternating electromagnetic field in the induction furnace, eddy currents are generated inside the material to achieve the effect of heating or melting. Under the stirring action of this alternating magnetic field, the composition and temperature of the material in the furnace are relatively uniform, the forging heating temperature can reach 1250℃, and the melting temperature can reach 1650℃.
In addition to heating or melting in the atmosphere, induction furnaces can also heat or melt in vacuum and protective atmospheres such as argon and neon to meet special quality requirements. Induction furnaces have outstanding advantages in heat permeation or melting of soft magnetic alloys, high resistance alloys, platinum group alloys, heat-resistant, corrosion-resistant, wear-resistant alloys and pure metals. Induction furnaces are usually divided into induction heating furnaces and melting furnaces.
An electric furnace that uses the induced current generated by the induction coil to heat the material. If the metal material is heated, it is placed in a crucible made of refractory material. If the non-metallic material is heated, the material is placed in a graphite crucible. When the frequency of the alternating current is increased, the frequency of the induced current is increased accordingly, and the heat generated increases. The induction furnace heats quickly, has a high temperature, is easy to operate and control, and the material is less polluted during the heating process, which can ensure the quality of the product. It is mainly used for melting special high-temperature materials, and can also be used as a heating and control device for growing single crystals from the melt.
Melting furnaces are divided into two categories: core induction furnaces and coreless induction furnaces.
The core induction furnace has an iron core passing through the inductor and is powered by an industrial frequency power supply. It is mainly used for melting and heat preservation of various cast iron, brass, bronze, zinc and other metals. The electrical efficiency is more than 90%, waste materials can be used, the melting cost is low, and the maximum furnace capacity is 270 tons.
The coreless induction furnace has no iron core passing through the inductor, and is divided into industrial frequency induction furnace, triple frequency induction furnace, generator set medium frequency induction furnace, thyristor medium frequency induction furnace, and high frequency induction furnace.
Supporting equipment
The complete set of equipment for the medium frequency induction furnace includes: power supply and electrical control part, furnace body part, transmission device and water cooling system.
Working principle
When the alternating current passes through the induction coil, an alternating magnetic field is generated around the coil, and the conductive material in the furnace generates an induced potential under the action of the alternating magnetic field. A current (eddy current) is formed at a certain depth on the surface of the charge, and the charge is heated and melted by the eddy current.