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.
 
 
Highlights
Successive development of materials engineering is observed, which offers new materials with unique properties
The high stability of the Electrical discharge machining (EDM)+US process is due to a more intensive rinsing of the sparking gap due to ultrasonic vibrations of the tool electrode, which accelerates the de-ionisation of the discharge channel and creates favorable conditions for re-ionisation
Conducted experimental investigations of electrical discharge machining assisted with ultrasonic vibration of Inconel 718 indicate that the greatest influence on the surface texture parameters is the intensity of electric current
Summary
Successive development of materials engineering is observed, which offers new materials with unique properties. Their rational implementation in industrial applications depends on the development of efficient methods of their machining. The aerospace industry, where these materials are used, constantly sets new, rigorous requirements on machining accuracy and quality of surface finish. Elements manufactured for these industries are made of special, difficult to machine alloy and composite materials, which are characterized by very good mechanical and chemical properties at increased temperatures. Due to the above reasons, unconventional methods of machining are becoming increasingly popular in manufacturing processes, i.e. electrical discharge machining, which allows machining of materials regardless of their mechanical and physicochemical properties [1÷6]
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