Influence of coated steel wire on the machining performance of W-EDM
01 May 2001-pp 497-504
About: The article was published on 2001-05-01 and is currently open access. It has received 1 citations till now. The article focuses on the topics: Machining.
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TL;DR: In this article, the importance of the wire's impedance in wire electrical discharge machining has been shown, especially for ferromagnetic wires, such as steel wire, in terms of the work piece roughness and material integrity.
Abstract: In wire electrical discharge machining (wire-EDM) material is removed by the thermal energy of an electric spark that has been initiated between two electrodes (the wire and the workpiece), submerged in demineralised water. The use of high frequency current pulses for sparking leads to excellent machining performance, in terms of the work piece roughness, the material integrity of the cut and the material removal rate. To reach the highest frequencies, the wire-EDM generator mostly consists of a voltage source with an as low as possible internal inductance. The working current delivered to the spark and, hence, the material removal rate of the process depends on the total impedance of the electrical circuit. In this article the importance of the wire’s impedance will be shown. Due to the skin-effect, this impedance depends on the frequency of the current signal, especially for ferromagnetic wires, such as steel wire. Coatings will prove to be primordial to prevent the machining speed from dropping significantly.
16 citations