Model of the object of temperature control by electrostimulating action parameters

V A Kuznetsov,E S Kuznetsova,V E Gromov

doi:10.17073/0368-0797-2021-6-435-441

V A Kuznetsov, E S Kuznetsova + Show 1 more

Open Access

https://doi.org/10.17073/0368-0797-2021-6-435-441

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Abstract

Technologies for pressure treatment of metal workpieces using powerful current pulses are becoming increasingly widespread both in Russia and abroad. Unique electromechanical processes are studied and improved in laboratory and production conditions. The process of applying an electric current to the workpiece is accompanied by a change in its physical properties as a result of the so-called electroplastic effect (EPE). At the same time, the temperature of the workpiece in the deformation zone increases. For high-quality and reliable operation of the drawing mill with electrostimulated drawing (ESW), it is necessary to use an automatic system for regulating the force and temperature. In order to implement the temperature control circuit, it is necessary to synthesize the transfer function of the control object – steel wire processed by pressure (rolling or drawing). Synthesis and analysis of parameters of the model of temperature control object are considered. The known relations are used: dependence of the pulse generator power on the calculated parameters (initial temperature, diameter, specific weight and electrical resistance of the workpiece, pulse duration); dependence of the RMS current of the generator on the amplitude and frequency of pulse reproduction; dependence of the magnetic permeability of the workpiece on its temperature; and dependence of the specific electrical resistance of the conductor material on temperature. In MATLAB – Simulink medium, a model of the temperature control object is synthesized as a function of the parameters of generator of high-power current pulses (amplitude and frequency), as well as the parameters of the workpiece to be processed (diameter, sample length, linear velocity, initial temperature, and resistivity at the initial temperature). The model is analyzed, and transients under different operating modes are presented. Using the developed model, the dependences of the temperature, power, and equivalent resistance on parameters of the generator and the workpiece are obtained for different generator pulse frequencies and workpiece diameters. The developed model can be used for laboratory studies of the electroplastic effect, as well as in production in auto-control systems with electrostimulated drawing in order to implement the object of regulation in the form of a model.

Highlights

Of the temperature control object is synthesized as a function of the parameters of generator of high-power current pulses, as well as the parameters of the workpiece to be processed
The dependences of the temperature, power, and equivalent resistance on parameters of the generator and the workpiece are obtained for different generator pulse frequencies and workpiece diameters
The developed model can be used for laboratory studies of the electroplastic effect, as well as in production in auto-control systems with electrostimulated drawing in order to implement the object of regulation in the form of a model

Summary

Оригинальная статья

Модель объекта регулирования температуры параметрами электростимулирующего воздействия. Рассмотрен синтез и анализ параметров модели объекта регулирования температуры. В среде «MATLAB – Simulink» синтезирована модель объекта регулирования температуры как функции от параметров генератора мощных токовых импульсов (амплитуды и частоты), а также параметров обрабатываемой заготовки (диаметра, длины образца, линейной скорости, начальной температуры, удельного сопротивления при начальной температуре). С использованием разработанной модели получены зависимости температуры, мощности и эквивалентного сопротивления от параметров генератора и заготовки при различных частотах импульсов генератора и диаметрах заготовки. Разработанная модель может быть использована для лабораторных исследований электропластического эффекта, а также в производстве в системах автоуправления электростимулированным волочением с целью реализации объекта регулирования в виде модели. Ключевые слова: генератор мощных импульсов тока, система автоматического регулирования параметров генератора, модель нагрева металлической заготовки, объект регулирования, передаточная функция объекта регулирования. Модель объекта регулирования температуры параметрами электростимулирующего воздействия // Известия вузов.

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