An induction furnace is an electrical furnace in which the heat is applied by induction heating of “V: Coreless Induction Furnaces”. Electric Melting Practice. Calderys offers refractory solutions for all parts of Coreless Induction Furnaces, whether you are melting non-ferrous alloys with melting points below °C. Solutions in dry ramming mix; Installation by Vibrosystem; Solutions with CPS ( Crucible Preformed System); Service at the installation and start- up; After-sale.

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Aluminium > Coreless induction furnaces

The metal to be heated is placed within a high-frequency current carrying coil. Annealing Low hydrogen Short circuit. A channel-type induction furnace has insuction loop of molten metal, which forms a single-turn secondary winding through an iron core. A preheated, one-tonne furnace melting iron can melt cold charge to tapping readiness within an hour.

In other projects Wikimedia Commons. Therefore, static capacitors are used to improve the power factor of the installation.

From Wikipedia, the free encyclopedia. The eddy currents produced in the charge not only heat it up but also account for the stirring action. Smelting Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct reduced iron. The primary is wound over the crucible itself. An induction furnace is an electrical furnace in which the heat is applied by induction heating of metal.

This page was last edited on 17 Decemberat For lower capacities of furnaces higher frequency of the order of Hz are employed whereas for higher capacities frequencies are down to Hz. Power loss due to eddy currents is eddy current loss and appears in the form of heat. The process is economical for continuous heating.


Medium-frequency coreless induction furnaces

The oscillators can generate a very high frequency in the order of megahertz. The advantages of coreless induction furnaces over other types are given below:. British Electrical Development Association. The heat in the material to be heated is produced by eddy currents. Since the power factor does not remain constant during the operation of the furnace, the capacitance in the circuit during heat cycle is varied to maintain power factor approximately unity.

By using this site, you agree to the Terms of Use fuurnace Privacy Policy. Articles needing additional references from November All articles needing additional references All articles with unsourced statements Articles with unsourced statements from July Since no arc or combustion is used, the temperature of the material is no higher than required to melt it; this can prevent loss of valuable furnaec elements.

Iron laminations are provided outside the primary winding to create a low reluctance path for flux and also contain the stray field which may otherwise induce the heavy current in supporting steel structure.

The capacities available vary from 50 Kg to about 20 tones. Views Read Edit Furnsce history. Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct reduced iron.


A crucible of more convenient shape can be employed. Leave this field empty. The frequency employed depends upon the size of the coreless induction furnace. Leave a Reply Cancel reply Your email address will not be published. To reduce copper losses, hollow copper tubes are used in which cold water is circulated.

The AC supply is stepped up by a transformer and then rectified by using a bridge rectifier circuit. Your email address will not be published. Retrieved from ” https: By doing so alternating magnetic field is set up, eddy currents are induced in the metal piece and heat is produced in it.

Allied Mineral Products | Coreless Furnace – Aluminum Alloy

For the same conductivity, the higher frequencies have a shallow skin corelesss is less penetration into the melt. Bessemer process Open hearth furnace Electric arc furnace Basic oxygen process. This is also known as the induction heating. This site uses cookies: In the coreless type, [6] metal is placed in a crucible surrounded by a water-cooled alternating current solenoid coil.

Vikas Publishing House Pvt. No core is provided in the coreless induction furnace. Generally, the smaller the volume of the melts, corwless higher the frequency of the furnace used; this is due to the skin depth which is a measure of the distance an alternating current can penetrate beneath the surface of a conductor.