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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In the coreless type, [6] metal is placed in a crucible surrounded by a water-cooled alternating current solenoid coil.

Number of turns R c: 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 ]. This page was last edited on inducyion Novemberat The required number of amper-turns to melt the charge practically measured and theoretically calculatedis illustrated in table 3.

The induction furnace is, therefore, based on four principles: Low hydrogen Short circuit. Figure 12 represent the impedance of furnace theoretically calculated and practically measured using LCZ meter type HPA. Electro-slag remelting Vacuum arc remelting Argon oxygen decarburization. Many analytical methods could be applied to induction heating and melting problems.

Cross-section view of obtained crucible is shown in fig. Fundamentals Of Power Electronics. The mold and its cross- section view are shown in fig. This material have very acceptable thermal, mechanical, metallurgical qualities for the task, also there is available experience in handling this material. The magnetic field induces eddy currentscircular electric currents, inside the metal, by electromagnetic induction.

During each test of the charge melting, the frequency was fixed. Cofeless preheated, one-tonne furnace melting iron can melt cold charge to tapping readiness within an hour.

Steel and high temperature alloys

The tube insulated by means of sleeve insulator. The charge used to test the furnace was gm. The load circuit is a resonant. Vikas Publishing House Pvt. Once melted, the eddy currents cause vigorous stirring of the melt, assuring good mixing. Retrieved from ” https: A design procedure was developed as computer programs, these programs accomplished a general design which can be utilized to design coreless furnaces of variable specifications. Charge inductance ohm X g: Crucible inductance ohm X r: Neither the equivalent circuit method nor the superposition method specify the number of turns of the induction coil, these method can only obtain amper-turn required by charge to be melt.

From Wikipedia, the free encyclopedia. A complete study of performance of furnace is performed from the calculation of the equivalent circuit resistances and inductances. The electromagnetic field attenuates rapidly inside the charge. An induction furnace consists of a nonconductive crucible holding invuction charge of metal to be melted, surrounded by a coil of copper wire.

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Table 2 illustrate the function efficiency obtained theoretically and measured practically for tests the charge melted successfully. The physical specification of the workpiece and its dimension determine the frequency of the power supply for heat process.

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. 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.

Coil impedance ohm Infuction w: 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. Finally; the successful of design and construction of a small induction furnace with limited abilities pushing us to continue in this way to cover what about the building of induction furnaces. A variety of the metal were studied to choose the charge.

Induction furnace

Charge resistance ohm X c: Induction Furnace “, M. Smelting Bloomery produces sponge iron Blast furnace produces pig iron Cold blast Hot blast Anthracite iron Direct furnsce iron. 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 raise of temperature of charge during one of melting test was shown in fig.

A powerful alternating current flows through the wire. The second funrace “Equivalent Circuit” is based on the equivalent circuit method, as previously mentioned. On the contrary, the use of equivalent circuit method requires this information as pre- requisite, so to prepare a complete ckreless of the coreless induction. American Society for Metals.

Figures 8 and 9shows the amper-turn, versus frequency for equivalent circuit method and the superposition methods respectively. Pattern welding Damascus steel Crucible steel Tatara furnace Cementation process. Lower frequencies can generate stirring or turbulence in the metal. This method is the main design technique used in this work.

Allied Mineral Products | Coreless Furnace – Aluminum Alloy

Annealing Low hydrogen Short circuit. Iron and steel production. 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. An advantage of induction heating is that the heat is generated within the correless charge itself rather than applied by a burning fuel or other external heat source, which can be important in applications where contamination is an coreldss.