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.

Author: Kishura Malalkis
Country: Namibia
Language: English (Spanish)
Genre: Love
Published (Last): 4 March 2015
Pages: 256
PDF File Size: 12.33 Mb
ePub File Size: 16.19 Mb
ISBN: 486-6-65088-331-8
Downloads: 27631
Price: Free* [*Free Regsitration Required]
Uploader: Mazumi

Iron and steel production. November Learn how and when to remove this template message. This article needs additional citations for verification.

The advantage of the induction furnace is a clean, energy-efficient and well-controllable melting process compared to most other means of metal melting.

Most suitable for the production of high-grade alloy steels. Power loss due to eddy currents is eddy current loss and appears in the form of heat. Bessemer process Open hearth inductiin Electric arc furnace Basic oxygen process. A preheated, one-tonne furnace melting iron can melt cold charge to tapping readiness within an hour.

The absence of dirt, smoke noise etc. Fundamentals Of Power Electronics. In ferromagnetic materials like ironthe material may also be heated by magnetic hysteresisthe reversal of the molecular magnetic dipoles in the metal.

This site uses cookies: The one major drawback to induction furnace usage in a foundry is the lack of refining capacity; charge materials must be clean of oxidation products and of a known composition and some alloying elements may be lost due to indction and must be re-added to the melt. In this case, also the charge to be melted is made the secondary of the transformer.

Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct reduced iron. Views Read Edit View history.


The heat in the material to be heated is produced by eddy currents. Since the eddy current loss is proportional to the product of the square of coreles frequency and square of flux density, therefore by controlling the flux density and supply doreless the amount of heat can be controlled.

By doing so alternating magnetic field is set up, eddy currents are induced in the metal piece and heat is produced in it. The magnetic field induces eddy currentscircular electric currents, inside the metal, by electromagnetic induction. Electro-slag remelting Vacuum arc remelting Argon oxygen decarburization. The initial cost is more as compared to arc furnace.

A powerful alternating current flows through the wire.

Most modern foundries use this type of furnace, and now also more iron foundries are replacing cupolas with induction furnaces to melt cast ironas the former emit lots of dust and other pollutants. 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.

The eddy currents produced in the charge not only heat it up but also account for the stirring action. Leave a Reply Cancel reply Your email address will not be published.

Medium-frequency coreless induction furnaces | OTTO JUNKER

This is also known as the induction heating. British Electrical Development Association.

Leave this field empty. Pattern welding Damascus steel Crucible steel Tatara furnace Cementation process. For coreless induction furnaces power supply is obtained from ordinary supply system and its frequency is converted to the higher value by means of oscillators.

Eddy current heating is used for the heat treatment of metals i. Iron laminations are provided outside the primary winding to create a low reluctance path for flux and corelses contain the stray field which may otherwise induce the heavy current in supporting steel structure.


Induction furnace

From Wikipedia, the free encyclopedia. The coreless induction furnace is chiefly used for melting of steel and other ferrous metals. Low hydrogen Short circuit. Lower frequencies can generate stirring or turbulence in the metal. The frequency may vary from 50 Hz to 8 MHz depending upon the type of work done. Unsourced material may be challenged and removed. The material to be heated is placed inside the coil.

A crucible of more convenient shape can be employed. History of ferrous metallurgy List of steel producers. The advantages of coreless induction furnaces over other types are given below:. Please help improve this article by adding citations to reliable sources. Annealing Low hydrogen Short circuit. No core is provided in the coreless induction furnace. For the same conductivity, the higher frequencies have a shallow skin depth—that is less penetration into the coreles. The oscillators can generate a very high frequency in the order of megahertz.

Smelting Bloomery produces sponge iron Blast furnace produces pig iron Niduction blast Hot blast Anthracite iron Direct reduced iron. An induction furnace consists of a nonconductive crucible holding the charge of metal to be melted, surrounded by a coil of copper wire.

Coreless Induction Furnace (CIF) | Calderys

In the coreless type, [6] metal is placed in a crucible surrounded by a water-cooled alternating current solenoid coil. The metal to be heated is placed within a high-frequency current carrying coil.

A channel-type induction furnace has a loop of molten metal, which forms a single-turn secondary winding through an iron core. For lower capacities of furnaces higher frequency of the order of Hz are employed whereas for higher capacities frequencies are furnafe to Hz.