Surface texture of S 718 after electrical discharge machining assisted with ultrasonic vibration of a tool electrode

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Rafał Nowicki
Rafał Świercz
Adrian Kopytowski
Alena Vagaská

Abstract




Inconel 718 is one of the modern materials widely used in the aviation and space industry, due to their excellent mechanical and chemical properties at elevated temperatures. These parts work in difficult conditions and they are required to be characterized by good accuracy and high quality surface finish to ensure greater durabili-ty and fatigue strength. Conventional machining of these materials is difficult and ineffective due to low thermal conductivity of the alloy. Electrical discharge machining (EDM) is often used to machine materials regardless of their mechanical and physical properties. In this process material is removed from the workpiece through series of electric discharges occurring in the sparking gap between a tool electrode and the workpiece. The physics of removing material from the workpiece is completely different from other traditional machining methods, and its effects determine the functional properties of the surface layer. The purpose of the experimental research was to investigate the influence of machining parameters on surface texture of Inconel 718 after electrical discharge machining assisted with ultrasonic vibration of the tool electrode (EDM+US). The study was carried out with a design experimental methodology. Input parameters were discharged current I and pulse duration ton.Roughness parameters Sa, St, Sz were designated for each machined surface.


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[1]
R. Nowicki, R. Świercz, A. Kopytowski, and A. Vagaská, “Surface texture of S 718 after electrical discharge machining assisted with ultrasonic vibration of a tool electrode”, WeldTechRev, vol. 91, no. 2, Feb. 2019.
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