Experimental study on the influence of electrode geometry and electrode path on wear pattern in EDM

摘要

Multi-axis Electrical Discharge machining has become a feasible solution in the manufacturing of complex geometry parts of the aerospace and energy industry. In EDM, the final work piece is principally affected by electrode wear and gap width. The machine tool manufacturers provide limited information concerning both features, in which they do not consider the electrode geometry and electrode path. Thus, nowadays, previous highly time and cost consuming trial-and-error strategies are necessary for the machining of complex free form geometries. It is believed that a further understanding of electrode wear and gap width distribution patterns related with electrode geometry and machining path could enhance the electrode design and improve the process efficiency. Hence, the present work proposes easy-to-put in practice electrode wear and gap indicators, for those cases in which the average definition of wear is not enough. Furthermore, the proposed indicators have been tested in an experimental study of electrode wear and gap width in the EDM manufacturing of a shrouded blisk.