EQUIPMENT PROVISION OF ELECTROSTIMULATED METAL PROCESSING

The new construction materials with high technological and performance characteristics, which cannot be achieved by traditional methods, are required to create modern mechanical equipment. Prospects for the development of technologies of steels form changing are largely related to the use of external radiation, in particular powerful current pulses generated by the pulse generators of powerful unipolar current amplitude up to 10 – 15 kA, frequency reproduction up to 400 Hz and pulse duration of 100 microseconds. The disadvantages of such generators, preventing their widespread use in the industry are low efficiency and significant power consumption of the AC, as well as the inability to control the power parameters. The article presents description of the powerful generator of unipolar pulses having the charger connected to power capacitors and the thyristor switch, discharging the capacitors to the low ohm load. In order to reduce the main power, the charge exchange device on the base of thyristor connected antiparallelly in thyristor switch is introduced in the scheme. To realize the possibility of pulse amplitude control and increase in its capacity two irreversible thyristor transformers are used in charger instead of an unregulated direct current source. These thyristor transformers are switched on in series and in unidirectional way. They permit to obtain the regulated voltage at power capacitors. In order to optimize the capacitor charging process a two-circuit system of subordinate regulation of pulse generator parameters with external voltage control circuit and internal control – current capacitor charge. The model of the suggested generator is implemented in the “Matlab, Simulink” medium. This model is adequate to the real pulse generator used in SibSIU for investigation of electrostimulated plastic deformation of metals and alloys. The developed model permitted to improve the technical parameters and device operation regimes. The considerable mains power decreases as well as possibility of capacitor charge voltage control up to 600 V in the range of pulse repetition frequency of 400 Hz are the advantages of updated generator in comparison with the analogues. The generator can be used in industry, in particular, at rolling production for hard deformed steel wire drawing.

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