Application of Circuit Modeling in the Study of Spark Formation During Electroerosion Treatment

Artur Porvatov,Andrey Maslov,Alexander Zelensky,Vladimir Kuptsov,Petr Pivkin,Vladimir Kuznetsov,Marko Leonesio,Ilya Minin,Marian Morozkin,Mikhail Kozochkin,A Nadykto,P Lima,L Uvarova,A Zelensky,N Aleksic,X Jiang,P Pivkin

doi:10.1051/epjconf/202124804016

Artur Porvatov, Andrey Maslov + Show 15 more

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https://doi.org/10.1051/epjconf/202124804016

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Electrical discharge machining (EDM) of a workpiece is a complex, fast-flowing process characterized by alternating (intermittent) states: short circuit, idle and spark formation. The discontinuity of the EDM process means that the processing is carried out in single pulses, which are formed by a special pulse generator. The parameters of the generator pulses can be divided into time and electrical. The time period and duration of the pulses, as well as the difference between these two parameters (the “silence” interval), are considered temporary. The electric ones include the amplitude value of the voltage, the maximum permissible current, and the polarity of the pulses. in addition, depending on the device of the generator, the pulses can be composite, for example, have an igniting pulse with a higher voltage and a lower current than the main (working) pulse. In this work, we have developed a interelectrode gap model that allows not only to obtain values of electrical parameters, but also to evaluate and to optimize the electrical parameters of materials being processed with known electrical properties. The key advantage of this model is its modularity, which allows to add new functional blocks, which describe external and internal influences, for example, the concentration of erosion products, uneven electrical conductivity of the workpiece, and others, without changing its structure.

Highlights

The Electrical discharge machining (EDM) process is influenced by various factors such as the electrical conductivity of the workpiece and liquid, the state of the electrode, the parameters of the generator and others
The state of the interelectrode gap (IEG) has concentrated most of the parameters that are difficult or impossible to control in the EDM process, so its assessment is carried out indirectly, for example, by current
With EDM, the field strength in the IEG increases up to the discharge with a decrease in this distance. conditionally, depending on the interelectrode distance, the IEG can be in three states: 1) idling (XX), at h2 < IEG < ∞; 2) operating pulses, at h1< ieg < h2; 3) short circuit, at 0 < ieg < h1, where h1 and h2 are the lower and upper bounds for the occurrence of discharges, respectively

Summary

Introduction

The EDM process is influenced by various factors such as the electrical conductivity of the workpiece and liquid, the state of the electrode, the parameters of the generator and others. A discharge occurs in the IEG (during the operation of the generator and the formation of current pulses), which takes place in 6 stages: 1) the appearance of an electromagnetic field between the electrode and the workpiece; 2) ionization of the fluid in the IEG; 3) formation of a conduction channel; 4) spark discharge-conversion of electrical energy into thermal energy (formation of a plasma channel) destruction of the material; 5) crater formation; 6) repeat steps 1-5.

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