ВЛИЯНИЕ ГЕОМЕТРИЧЕСКИХ ПАРАМЕТРОВ ЛУНКИ, ПОЛУЧЕННОЙ НА МЕТАЛЛИЧЕСКОЙ ПОВЕРХНОСТИ В РЕЗУЛЬТАТЕ ВОЗДЕЙСТВИЯ ЭЛЕКТРИЧЕСКОГО РАЗРЯДА, НА ЕЕ РЕЖУЩУЮ СПОСОБНОСТЬ

The paper contains an analysis of dimple geometric parameters obtained on wire surface during its in its electrical discharge machining. A photography and description of one of the dimples has been given in the paper. The paper has analyzed a cross-sectional shape of the obtained dimple with due account of the solidified metal flows formed along its edges. The flows in a first approximation can be considered as elements of a cutting wedge. According to cutting theory provisions the paper considers solidified metal flow shapes in a longitudinal section and indicates angles which have been formed by the flows, working planes and edges which can be involved in the cutting process. It has been shown that cutting elements on the dimple surface are arranged symmetrically that makes it possible to carry out cutting process while moving a tool in both directions of reciprocating motion. Parameters of cutting surface influencing on cutting process execution have been specified in the paper. It has been demonstrated that due to changes in energy of electric discharge through voltage or capacity of a power supply storage capacitor it is possible purposefully to influence on the shape and size of metal flows and, respectively, on values of cutting wedge parameters that characterize a tool cutting ability. A conclusion has been made about possibility to obtain the most advantageous values of these parameters while optimizing modes of wire electrical discharge machining.Выполнен анализ геометрических параметров лунок, полученных на поверхности проволоки при ее электроконтактной обработке. Приведена фотография и дано описание одной из таких лунок. Проанализирована форма сечения полученной лунки с учетом образовавшихся по ее краям наплывов затвердевшего металла, которые в первом приближении можно считать элементами режущего клина. Исходя из положений теории резания, рассмотрена форма наплывов затвердевшего металла в продольном сечении, указаны углы, образованные ими, рабочие плоскости и кромки, которые могут участвовать в процессе резания. Показано, что режущие элементы на поверхности лунки располагаются симметрично. Это делает возможным осуществление процесса резания при перемещении инструмента в обоих направлениях возвратно-поступательного движения. Выделены параметры режущей поверхности, влияющие на протекание процесса резания. Отмечено, что за счет изменения энергии электрического разряда через напряжение либо емкость накопительного конденсатора источника питания можно целенаправленно влиять на форму и размеры наплывов металла и соответственно на значения параметров режущего клина, определяющих режущую способность инструмента. Сделан вывод о возможности получения наивыгоднейших значений этих параметров путем оптимизации режимов электроконтактной обработки проволоки

EFFECT OF DIMPLE GEOMETRIC PARAMETERS OBTAINED ON METAL SURFACE BY ELECTRICAL DISCHARGE ON ITS CUTTING ABILITY

The paper contains an analysis of dimple geometric parameters obtained on wire surface during its in its electrical discharge machining. A photography and description of one of the dimples has been given in the paper. The paper has analyzed a cross-sectional shape of the obtained dimple with due account of the solidified metal flows formed along its edges. The flows in a first approximation can be considered as elements of a cutting wedge. According to cutting theory provisions the paper considers solidified metal flow shapes in a longitudinal section and indicates angles which have been formed by the flows, working planes and edges which can be involved in the cutting process. It has been shown that cutting elements on the dimple surface are arranged symmetrically that makes it possible to carry out cutting process while moving a tool in both directions of reciprocating motion. Parameters of cutting surface influencing on cutting process execution have been specified in the paper. It has been demonstrated that due to changes in energy of electric discharge through voltage or capacity of a power supply storage capacitor it is possible purposefully to influence on the shape and size of metal flows and, respectively, on values of cutting wedge parameters that characterize a tool cutting ability. A conclusion has been made about possibility to obtain the most advantageous values of these parameters while optimizing modes of wire electrical discharge machining