Collect. Czech. Chem. Commun. 1981, 46, 2788-2794

Criterion equation for calculation of the current limiting electrochemical machining by formation of sparks

Petr Novák, Ivo Roušar, Václav Cezner and Vladimír Mejta

Department of Inorganic Technology, Prague Institute of Chemical Technology, 166 28 Prague 6


The current density used in electrochemical machining can be increased only up to a certain value, above which the formation of electric sparks on the cathode (tool) is observed, whereby the latter and its insulation are damaged. The present work is devoted to the measurement of this critical current density for the case of electrochemical drilling of small holes by means of metal capillaries provided with an external insulation. The results are correlated by a criterion equation which gives the values of the limiting currents for sparking, IS , with an average error of ±9%.