Importance

Loading Importance Indicators...

Abstract

The invention relates to electrochemical pulse machining (ECM) of high alloy steel, alloys and conducting composite materials that include components with substantially different electrochemical properties. In particular, the invention can be used to perform various copy-piercing operations when producing intricately shaped surfaces of machines and tools made of WC—Co, WC—TiC—Co alloys.The method comprises machining at low interelectrode gaps using anode or bipolar high-frequency current pulses supplied in bursts which are synchronized with the moments of maximum convergence between an oscillating tool electrode and a workpiece, and additional singular pulses of opposite polarity supplied during pauses between pulse bursts, wherein a ratio of parameters for the pulses of normal and opposite polarity is adjusted based on the initial electrolyte acidic value. The method is carried out in a way that a transitional bend is formed at a peak of an additional pulse, said bend being caused by the change in electrical resistance of the interelectrode gap up to a steady value, the duration of additional pulse sections before and after the bend point being set depending on the machining mode and the composition of the material subjected to machining. The invention allows to carry out electrochemical machining of composite conducting materials comprising components with substantially different electrochemical properties providing a surface layer of predetermined chemical composition, as well as surface quality, by operatively adjusting and controlling the machining process parameters to provide control over component anode dissolution intensity.

Loading the Abstract Image...

First Claim