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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Iron rurnace steel production. Correc R tion factor The charge melting successfully during the tests of furnace operation shows that the design procedure equivalent circuit method paired with theoretical and practical process was suitable for such work. The magnetic field imduction eddy currentscircular electric currents, inside the metal, by electromagnetic induction. Fundamentals Of Power Electronics. Table 2 illustrate the function efficiency obtained theoretically and measured practically for tests the charge melted successfully.

During each test of the charge melting, the frequency was fixed.

The equivalent circuit method are general methods that can be applied to analysis and design of all induction heating applications, the coreless furnace is certainly one of them. The equivalent circuit method is regarded as general method because this method doesn’t determine the dimensions, frequency or the power requirements of the specific application analyzed and designed by this method.

The coreless induction furnace is a simple unit consisting of a helically wound coil surrounding a refractory crucible containing the molten charge and connected to an alternating excitation system[ 2 ].


Crucible inductance ohm X r: In accordance with the theoretical basis, three programs were developed, the first program “Required Power” calculates the required power by the charge to coreess melt and also calculates the thermal efficiency. By using corwless site, you agree to the Terms of Use and Privacy Policy. It is clearly that the increasing of the power and frequency lead to efficiency increasing and decreasing melting time as a result of increasing number of amper-turns.

The coil creates a rapidly reversing magnetic field that penetrates the metal. Smelting Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct futnace iron.

Coil resistance ohm R w: Industrial furnaces Induction heating. If the reading of LCZ meter in fig. The raise of temperature of charge during one of melting test was shown in fig. The coreless induction furnace is considered as the most popular type of the induction furnaces because of its suitability for all metal industries[ 1 ].


Design and Construction of the Coreless Induction Furnace

Ultimately, the furnace was constructed and the final aim, which is melting the metal, was achieved. This material have very acceptable thermal, mechanical, metallurgical qualities for the task, also there is available experience in handling this material. Articles needing additional references from November All articles needing additional references All articles with unsourced statements Articles with unsourced statements from July Cross-section view E of the mold R.

The required power consists of: Part of the developed heat is lost to the surrounding medium, and the remaining part is distributed through the mass of the charge by effect of thermal conductivity[ 3 ].


Coil length m N c: The physical specification of the workpiece and its dimension determine the frequency of the power supply for heat process. When the coil is excited by an alternating current it produce an axial alternating magnetic field.

The most proper charge metal was tin. From Wikipedia, the free encyclopedia.

The required number of amper-turns to melt the charge practically measured and theoretically calculatedis illustrated in table 3. Also other test with different frequencies were performed.

Medium-frequency coreless induction furnaces

Cross-section view of obtained crucible is shown in fig. In the coreless type, [6] metal is placed in a crucible surrounded by a water-cooled alternating current solenoid coil. Inductioon Induction Furnace is an electrical furnace in which the heat is applied by induction heating of metal. Lower frequencies can generate stirring or turbulence in the metal.

The mold and its cross- section view are shown in fig.

Steel and high temperature alloys

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 c S ircuit diagram of the E power supply R. This method is the main design technique used in this work.