Development of technological and experimental researches in the area of physical nature of Electro-Discharge have achieved a standard when not only explanation of observable phenomena, but also prognostication of technology and equipment development and estimation of perspective tendencies of Electro-Discharge Machining (EDM) as area of science and engineering became possible. The main tendencies of scientific and engineering work are physico-theoretical investigations and development of technological processes and creation of equipment. Till now they were developing rather separately, without clear interdependence and the influence of one tendency upon another had a casual character. Overcoming of these difficulties and finding logical interdependencies among physico-theoretical, technological and designer working out is possible only on the base of common methodic approach towards the analysis of EDM development. According to this conception this paper presents the results of mathematical description of physical model of erosion process. The methods of EDM technological characteristics calculation allow to obtain with sufficient precision the real values of such parameters of EDM process as impulse energy, optimal impulse duration, maximum impulse frequency, data concerning surface roughness and size of the area of thermal influence on surface layer without experiment. The data about precision and quality of surface layer, thermal characteristics of material being treated are sufficient for obtaining of these results. Obtained results allowed to achieve a steep decrease in time duration of technological process development of EDM of monolithic rotor. The data about development and exploitation of unique electro-discharge seven coordinates machine tool SEP-1 for cell structure machining.
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