An Induction Furnace is an electrical furnace in which the heat is applied by induction heating “V: Coreless Induction Furnaces”. Electric Melting Practice. The coreless induction furnace is one of the most important furnace types for cast iron foundries, for the whole non-ferreous industry and for special applications. Topics include furnace components, the sequence of operations for daily start-up, “normal” furnace operation and types of induction furnaces, the differences in.

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Charge resistance ohm X c: In accordance with the theoretical basis, three programs were developed, the first program “Required Power” calculates the required power by the charge to be melt and also calculates the thermal efficiency.

Figures 8 and 9shows the amper-turn, versus frequency for equivalent circuit method and the superposition methods respectively. Cross-section view of the insulated tube is shown in fig.

Charge inductance ohm X g: An induction furnace consists of a nonconductive crucible holding the charge of metal to be melted, surrounded by a coil of copper wire. This method is the main design technique used in this work.

In ferromagnetic materials like ironthe material may also be heated by magnetic hysteresisthe reversal of the molecular magnetic dipoles in the metal. Coil resistance ohm R w: Please help improve this article by adding citations to reliable sources. 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 alloying elements.


The most suitable method for the present work is equivalent circuit method, a second approach is the superposition method, to check the results of the first method in one step of the design. Also other test with different frequencies were performed. When corelesss coil is excited by an alternating current it produce an axial alternating magnetic field.

Induction furnace

Ultimately, the furnace was constructed and the final aim, which is melting the metal, was achieved. A variety of the metal were studied to choose the charge. The material used to construct the crucible was fireclay. The required number of amper-turns to melt the charge practically measured and theoretically calculatedis illustrated in table 3. By using this site, you agree to the Terms of Use and Privacy Policy.

Refractories | Coreless Induction Furnace Linings | Iron | Capital Refractories

Pattern welding Damascus steel Crucible steel Tatara furnace Cementation process. An advantage of induction heating is that the heat is generated within the furnace’s charge itself rather than applied by a burning fuel or other external heat source, which can be important in applications where contamination is an issue.

On the contrary, the use of equivalent circuit method requires this information as pre- requisite, so to prepare a complete design of the coreless induction. An operating induction furnace usually emits a hum or whine due to fluctuating magnetic forces and magnetostrictionthe pitch of which can be used by operators to identify whether the furnace is operating correctly or at what power level.

The required power consists of: Bessemer process Open hearth furnace Electric arc furnace Basic oxygen process. 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.

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Coil inductance ohm X w: Coil length m N c: Low hydrogen Short circuit. The induction furnace is, therefore, based on four principles: This page was last edited on 3 Novemberat A powerful alternating current flows through the wire. In the coreless type, [6] metal is placed in a crucible surrounded by a water-cooled alternating current solenoid coil.

Smelting Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct reduced iron.

Coreless Induction Furnace

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 oxidation and must be re-added to the melt.

The magnetic field induces eddy currentscircular electric currents, inside the metal, by electromagnetic induction. Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct reduced iron.

The advantage of the induction furnace is a clean, energy-efficient and well-controllable melting process compared to most other means of metal melting. The second program “Equivalent Circuit” is based on the equivalent circuit method, as previously mentioned.

The physical specification of the workpiece and its dimension determine the frequency of the power supply for heat process.