BEHAVIOR OF SOME DISTINCT METALLIC MATERIALS DURING THE ELECTROCHEMICAL MACHINING WITH FORCED HYDRODYNAMIC DEPASSIVATION

Abstract

The electrochemical machining with forced hydrodynamic depassivation allows the material removal from workpiece by electrochemical erosion. The products resulted as a consequence of the electrochemical reactions developed between the workpiece material and electrolyte are removed from the machining zone by forced circulation of the electrolyte. A theoretical analysis led to formulation of several hypothesis concerning the behaviour of some metallic materials when test samples presenting a conical surface are affected by the electrochemical machining process with forced hydrodynamic depassivation. In the paper, the results of some experimental researches developed on test samples from steel, bronze and aluminium are presented. By mathematical processing of the experimental results, some empirical mathematical models were established. The empirical models highlight the influence exerted by the gap size, by the size of angle corresponding to the conical surface and by the voltage applied to the two electrodes on the size of the final gap and on the quantity of material removed from the test piece, for a certain duration of the machining process.

Keywords

• electrochemical machining
• hydrodynamic depassivation
• experimental research
• empirical mathematical models
• gap size
• material removal rate