Abstract
Currently, the electrical discharge machining is mainly applied to obtain surfaces difficult to be obtained using other machining processes in the workpieces made of electroconductive materials. The electroerosion process involves the initiation of electrical discharges in the zones where there is the lowest electrical resistance between the tool electrode and the workpiece. The study of the asperities peaks behavior under the action of the electric discharges would allow a better understanding of gradual developing of the surfaces generated by the electroerosive process. A way of addressing this problem could be based on the use of a device that would allow the study of the influence exerted by some process input factors on the results of a single electrical discharge developed between the test piece sharp peak and the tool electrode. The formulation of the functional requirements and the application of some methods of stimulating the technical creativity and of selecting solutions on the basis of predetermined criteria allowed the definition of a principle solution corresponding to an experimental device applicable for studying the behavior of sharp peaks under the action of single electrical discharges.
Highlights
A useful solution in the case of the necessity to obtain pieces of hard materials that are difficult to process by classical machining is to use one of the so-called unconventional machining
In the classical machining methods, the basic principle used for the material removal from the workpiece is the principle of plastic deformation, while for the nonconventional machining methods, the working principle is based on the existence of developing thermal, chemical or micromechanical cutting processes [1, 2]
For example, one considers a conical asperity, it is possible that when the angle at the cone peak is higher, the heat generated by the discharge can quickly dissipate into a larger volume of material, which could result in a decrease of the amount of material removed from the asperity by a single electrical discharge
Summary
A useful solution in the case of the necessity to obtain pieces of hard materials that are difficult to process by classical machining is to use one of the so-called unconventional machining. The researchers have shown interest in highlighting the extent to which different factors exert influence on the surface roughness obtained by electrical discharge machining. The objective pursued by the research presented in this paper was to highlight the extent to which the shape and dimensions of the surface asperities as well as other input factors in the electrical discharge machining can exert influence on the amount of material removed from the workpiece by a single electrical discharge. For example, one considers a conical asperity, it is possible that when the angle at the cone peak is higher, the heat generated by the discharge can quickly dissipate into a larger volume of material, which could result in a decrease of the amount of material removed from the asperity by a single electrical discharge. In this relation C being the capacitance of the capacitors included in the discharge circuit, in F, Ui - the initial voltage applied to the capacitors and electrodes, in V, Uf - the value of the voltage remaining on the electrodes after the electrical discharge is finished, in V
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