Activation of Electrochemical Piercing of Small Diameter Holes by Implementing High-Voltage Pulses in the Inter-Electrode Gap

Novosibirsk State Technical University, Faculty of Mechanical Engineering and Technologies, 630073 Prospekt K. Marks 20, Novosibirsk, Russia

Abstract

The results of intensifying the process of electrochemical piercing of small diameter holes in the range of 0.3 mm to 1 mm by implementing the high-voltage pulses in the inter-electrode gap are presented. It is shown that the implementation of electro-erosive discharges in the inter-electrode gap during the electrochemical processing with immovable electrodes intensifies the process, increasing the speed of forming by more than 10 times. It is explained by increasing the current density from 5 – 15 A/sm² to 50 – 100 A/sm² at the initial moment of processing and from 2 – 3 A/sm² to 10 – 15 A/sm² after obtaining a processing depth of 0.5 – 1.2 mm. It is established that the geometry distortion at the hole entrance is caused by instability of inter-electrode gap value. Increasing the accuracy of forming requires the implementation of the inter-electrode gap in the scheme of processing the stabilization system. Thus, it is necessary to conduct further investigations on forming the small diameter holes during relative displacement of electrodes.