AUTOMATIC CONTROL SYSTEM FOR ELECTROSTIMULATED DRAWING PROCESS

The system for electrostimulated drawing parameters control (temperature in deformation zone and drawing force) is considered, which forms a control signal to generator of high power current pulses. Its principle is based on periodic discharge of pre-charged capacitor to low-resistance load. To provide possibility of adjusting pulse amplitude and increasing its power, two non-reversible, serially and unidirectionally connected thyristor converters are used, instead of unregulated DC power source in charger, that allow obtaining adjustable voltage on power capacitors. In order to optimize capacitor charging process, two-circuit system of subordinate parameter control was carried out with an external voltage regulation loop and an internal circuit regulating charging current of the capacitors. Due to high speed of transient processes at electrostimulated drawing (a high degree of temperature rise in deformation zone due to considerable current pulse value up to 10 kA and its reproduction frequency up to 400 Hz), manual control is almost impossible. In order to increase reliability and quality of process of electrostimulated drawing using high power current pulse generator, an automatic control system for electrostimulated drawing
process (EDACS) is implemented. This system contains a single-loop system for adjusting the drawing force, as well as delayed temperature feedback in deformation zone. Dependences of change in drawing force and temperature on frequency of reproduction of pulses were obtained from the results of laboratory studies and calculations applying known and original techniques. For analysis of operating modes for electrostimulated drawing using automatic control system, the EDACS model was implemented in MATLAB-Simulink environment. The model is adequate to real parameters obtained in electroplastic effect investigations. The developed model allowed improvement of technical characteristics and operating modes of the system. Functional chart, model of system in MATLAB-Simulink environment, oscillograms of transient processes are considered. A singleloop automatic control system of drawing force with flexible temperature feedback in deformation zone allows optimization of operation modes as well as increase in reliability of electrostimulated drawing process. The system may be recommended for the research of electrostimulated deformation processes, it may also by introduced in production at wire drawing. 

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