Fundamentals of Machining Processes, 3rd Edition

13

  Machining by Electrochemical Erosion

13.1   INTRODUCTION

Electrolysis occurs when an electric current is passed between two electrodes dipped into an electrolytic solution. A typical example is shown in Figure 13.1, where the two copper electrodes are connected to a source of direct current (DC) and immersed in a solution of copper sulfate in water. The system of electrodes and electrolyte is referred to as the electrolytic cell. The chemical reactions that occur at the electrodes are called the anodic or cathodic reactions. Electrolytic dissolution of the anodic electrode forms the basis for electrochemical machining (ECM) of metals and alloys.

13.2   PRINCIPLES OF ECM

ECM uses a DC with a high density of 0.5–5 A/mm², which is passed through ...