EXPERIMENTAL INVESTIGATION OF ELECTRICAL DISCHARGE MACHINING WITH COPPER AND GRAPHITE ELECTRODE

Mechanical Engineering

Electrical discharge machining (EDM) is one of the earliest non-traditional machining processes. EDM is a thermal process in which rapid and continuous spark is discharged between electrically conductive work piece and electrode in dielectric medium. In the EDM process both the work piece material and the electrode material must be conductors of electricity. This process becomes cost-effective method of machining extremely tough and brittle materials. It is widely used for making molds, dies and sections of complex geometry and forming deep complex shaped holes, by arc erosion in all kinds of electro-conductive materials. The input variable parameters are current, pulse on time and duty cycle. The effect of the variable parameters mentioned above upon machining characteristics such as Material Removal Rate (MRR), Tool Wear Rate. Die sinking electrical discharge machining(EDM) is one of the most widely used techniques for the fabrication of die and mold cavities which are finally used for mass production of metals and polymer products by replication such as die casting, injection molding, etc. In any replication process, itis expected that the quality mold will faithfully duplicate its shape and surface texture. Inaccurate duplications cause problems in assemblies, operations as well as lower the aesthetic view. In die sinking EDM the electrode produces exactly its opposite shape on the work material.

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