Melting of metals by induction currents. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Melting of metals by induction currents. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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The operating model of the induction furnace is shown in Fig.1. The RF generator generates oscillations with a frequency of 27,12 MHz. it is assembled on four electron tubes (tetrodes). The neon lamp indicates that the device is ready for operation. The handle of the variable capacitor (CPE) C is brought out. At the highest capacity of the KPI, a piece of metal is rapidly heated, placed (in the crucible) in the coil L.

Fig.1. Generator circuit (click to enlarge)

To melt a piece of zinc, it is enough to heat it for 15 ... 20 s. Coil L - frameless, consists of 10 turns of PEV 0,8 wire, the inner diameter of the coil is 12 mm. Capacitor C from a broadcast radio receiver (with every second plate removed).

Melting of metals by induction currents
Ris.2.

The power of the device is such that it almost instantly heats up to red heat, for example, a screwdriver. The rate of metal melting in induction furnaces depends primarily on the generator power, frequency, hysteresis losses, eddy current losses in a piece of metal, and the rate of heat transfer to the environment. It is recommended to use powerful lamps, but their number when connected in parallel should not exceed four.

The oven is powered by 220 V AC mains through a rectifier. Capacitors C1 - ceramic or mica with an operating voltage of 1500 ... 2000 V. High frequency chokes.

Publication: N. Bolshakov, rf.atnn.ru

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