Improving the accuracy of processing deep holes by Electrical Discharge Machining with a rotating tubular electrode

Abstract

The article considers the factors affecting the accuracy of Electrical Discharge Machining. The process of formation of conglomerates resulting from processing is mainly investigated. Based on the literature analysis, the theoretical and real scheme of Electrical Discharge Machining is compared. As a result of the experiments carried out, it is revealed that in the process of deep holes, the electrode deviates from its axis due to the destabilization of the tool due to the non–rigidity of the electrode and the sticking of debris formed in the processing zone. The deviation of the electrode from the axis of rotation leads to uneven pressure from the liquid washing out the debris, which leads to uneven wear on the side of the electrode. During the study, samples of electroerosive debris are collected and studied. A direct relationship between the processing depth and the deviation value is revealed: the greater the processing depth, the greater the deviation value, which leads to distortion of the shape of the hole section and the formation of a cone instead of a cylinder. To improve the accuracy of processing deep holes, it is necessary to minimize the deviation of the electrode from the axis of rotation and protect the side surface of the electrode from the effects of current.

Keywords

• edm
• precision hole processing
• debris
• super drill
• deep hole processing
• tubular electrode-tool
• debris conglomerates