Abstract
The article discusses the benefits of multi frequency induction melting in the production of synthetic cast iron, structural (electric circuit) principles of dual frequency Power supplies of melting systems. The ways of electric power regulation of low frequency and high frequency components of the current in the inductor sections of furnace are demonstrated, namely power rescheduling at the metal melting stage, alloying stage and decarburizing of synthetic cast iron.
Highlights
Induction melting of metals in strong electromagnetic fields is widely used to obtain complex high homogenized alloys of ferrous and non-ferrous metals in modern foundry production of parts with high mechanical and physical characteristics
Undoubted advantages of medium frequency induction furnaces are: low energy consumption per ton of produced metal; batch regime of periodic melting; the high intensity of melting at high specific power of the electric power supplied to the metal; high performance of a metal production with a relatively low cost of induction furnace equipment
Improving the performance of induction furnaces is provided by the increase of specific power at a higher current frequency in the furnace inductor
Summary
Induction melting of metals in strong electromagnetic fields is widely used to obtain complex high homogenized alloys of ferrous and non-ferrous metals in modern foundry production of parts with high mechanical and physical characteristics. Improving the performance of induction furnaces is provided by the increase of specific power at a higher current frequency in the furnace inductor. Both the power action of high frequency electromagnetic field to the molten metal, and the intensity of the magnetohydrodynamic (MHD) processes of metal mixing are decreased. To obtain a homogeneous alloy with high accuracy of temperature distribution in the molten bath, power supply of furnace is produced by high and low frequencies currents at different stages of melting [1]
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