Method of electrochemical machining

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.

Summary of invention: in the initial step, the unipolar electrochemical machining by operating pulses of normal polarity is carried out forming a layer enriched with chromium ions in the electrolyte area adjacent to the workpiece surface, then, upon achievement of the predetermined machining depth, shape and size of the workpiece, the operational current pulses of normal polarity and the machining electrode feeding are turned off and the residual polarization voltage value at the interelectrode gap is measured using the test high-frequency pulses of normal polarity, then low voltage pulses of opposite polarity synchronized with the phase of maximal approximation of the electrodes to each other are turned on and chromium cathode deposition onto the machined workpiece surface is carried out by means of alternating the pulses of opposite polarity with test high-frequency pulses of normal polarity and controlling the chromium deposition by increment of residual polarization value relative to its value after operational pulses of normal polarity.

Description

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AI Technical Summary

Benefits of technology

The technical effect of this patent is improving the quality of machining by creating a shiny layer on the machine's surface while reducing harmful chemicals in the process. This involves using special techniques with low voltage pulses to first remove material from the surface before adding more material for better results.

Problems solved by technology

The technical problem addressed in this patent text is the lack of effective methods for machining chromium-containing steels using electrochemical machining (ECM) that provide high copying precision and the formation of a lustrous chromium layer on the machined surface. Existing methods also fail to control the formation of a voltage local extreme in the pulse midpoint, which negatively impacts the process. Additionally, none of the known methods provide conditions for forming a chromium layer with high accuracy and controlling the process of forming a chromium layer in a waste electrolyte solution.

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