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Magnalenz Induction Furnace

Electrical Measurement:
Monitoring of electrical characteristics of furnace operation provides valuable information about wear pattern of lining. This should be checked daily, when furnace is full or nearly full, and it a transformer tapping which gives maximum power at unity power factor.In the induction furnace the coil behaves as primary winding, and the molten metal as short circuited secondary winding. The lining provides a distance between the two. For a given voltage applied across the coil, the induced current in the melt is proportional to the lining thickness. As the lining wears the induced current in the melt, for a given voltage increases. Stated in other words for a given power, the MF voltage has to be reduced with progressive lining wear. Also with increases in lining wear, the inductance of the furnace increases and for unity power factor some HMES MF capacitors have to be switched OFF circuit.Daily log of electrical readings provides relevant information about lining condition.

In some furnaces, provision of earth leakage spider also provides safeguard to trip the furnace in case of a lining failure.Once the lining thickness has become about half of original thickness, it has to be knocked out.
Once it is decided to knock-out the lining at the end of the last heat, the furnace is completely tilted to drain out traces of liquid metal. In small and medium-size furnace knocking out is done manually. In large furnaces pneumatic tools may be used.Initially, top refractory is broken with a shot chisel. The lining is now slowly broken by using chisel to a depth of fritted layer, taking care that coil is not damaged.

When all the refractory lining is broken-out, the asbestos sheet is removed, and the coil is thoroughly inspected.

Description Of Mf Installations

Melting Crucibles

Mf Solid State Power Converter

Ancillary Equipments

Control Circuits

Safety Margin In Power

Safety And Protection System

Furnace Selection

Aluminum Melting

Induction Melting Of Brass

Induction Melting Of Copper

Induction Melting Of Steel

Very Small Capacity Induction

Melting Furnace

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