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Étude des fils électrodes pour l'usinage par étincelage érosif

Abstract : Zinc coated electrical discharge machining wires have a cutting speed advantage over plain brass wires. This advantage has been related to the thermodynamics of the arcs.For the same discharge current, and despite a lower arc voltage, coated wires cut faster than bare ones. Average arc voltages of different wires have been measured, and compared to published values. A thermodynamic model of the cathode has been made.Arc tension decreases as the metallic vapour pressure released by the cathode increases. Lower cathodic arc tensions release less heat, and lead to lower mass loss at said electrode. Higher arc pressures lead to higher molten electrode material ejection at the end of the arc discharges.Mass loss measurements on different wire electrodes and pieces confirm our point of view.
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Submitted on : Thursday, June 7, 2012 - 10:25:53 AM
Last modification on : Wednesday, November 17, 2021 - 12:27:32 PM
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  • HAL Id : pastel-00705214, version 1


Michel Ly. Étude des fils électrodes pour l'usinage par étincelage érosif. Matériaux. École Nationale Supérieure des Mines de Paris, 2005. Français. ⟨NNT : 2005ENMP1350⟩. ⟨pastel-00705214⟩



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