Abstract: The invention relates to the metalworking field, particularly to electrochemical sizing machining, and can be used for manufacturing of machine workpieces having an intricate profile and shaping furniture from chromium-containing steels and alloys operating in aggressive environment under excessive friction. Technical effect: improving machining accuracy by forming a lustrous layer on the machined surface and reduction of concentration of hexavalent toxic chromium ions in a waste electrolyte solution.

Abstract: The present invention relates to electrochemical machining (ECM) of conductive materials and can be used for manufacturing stamps, mould tools and other workpieces of complex shape at the finishing stage of the machining process. Method for electrochemical machining with an oscillating machining electrode comprises the step of applying rectangular microsecond current pulses synchronized with the moment when a machining electrode and workpiece electrode are moved to a minimum distance towards each other. During the machining process, the amplitude of current pulses is increased and the pulse duration is adjusted in such a manner that the trailing edge of each pulse corresponds to the moment of maximum electrical conductivity of the interelectrode gap, the amplitude being increased until a predetermined roughness of the surface to be machined is achieved.

Abstract: The invention is related to the field of pulsed electrochemical machining of steels and alloys and can be used for performing various precision copying and piercing operations for manufacturing intricate profile surfaces of machine and tool workpieces made of hard-to-machine materials. The method comprises the steps of applying microsecond current pulse packages synchronized with an instant when the machining electrode and a workpiece are moved to a minimum distance towards each other, measuring at least one concordant voltage and current value in each pulse, calculating corresponding values of an interelectrode gap resistance, and adjusting the machining process in accordance with the changes of the interelectrode gap resistance.

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.