Small-sized high-frequency installation for melting metals. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / welding equipment

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If there is a need to melt metal (brass, aluminum, zinc, silver, etc.) in small volumes, you can use an RF installation for melting metals with induction currents. The general fork of the installation is shown in Fig. 1, and the circuit diagram is shown in Fig. 2.

Fig.1. General view of a high-frequency installation for melting metals

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 unit 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 placed and tkgl is rapidly heated, which is introduced into the coil L. 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. If it is necessary to increase the diameter of the coil L without changing the oscillation frequency of the generator, you can use the calculation, i.e., recalculate the coil associated with a change in its diameter.

Schematic diagram of the installation

Capacitor C of variable capacity can be taken from the radio (with every second plate removed). The power of the installation is such that it almost instantly heats a screwdriver to red heat. The rate of metal melting in such installations depends primarily on the generator power, frequency, hysteresis losses and eddy current losses in a piece of metal. Lamps must be powerful, but their number when connected in parallel should not exceed four.

Capacitors C1 are ceramic or mica with an operating voltage of 1500-2000 V, if triodes are used, the resistor R is not needed. The HF unit is powered from the 127 or 220 V AC mains through a rectifier, which can be mounted together with the unit or placed in a separate unit. When working with the installation, it is necessary to strictly observe the safety regulations.

Note. Dr throttle data in installation. Coreless coil 10 turns, distance between turns 1 mm, PEV wire 0,6, coil diameter 9 mm. The crucible is ceramic. As a power source, you can use any power transformer from tube TVs or a tube radio that had at least 5-6 radio tubes. Or, using practical advice 25, calculate and manufacture a power transformer with a power of 250-300 watts.

Literature:

1. V.G.Bastanov. 300 practical tips. Moscow worker, 1986.

Publication: N. Bolshakov, rf.atnn.ru

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