Modares Mechanical Engineering

Modares Mechanical Engineering

Study of the effect of tools ultrasonic vibrations and external magnetic field on machined surface integrity at EDM process

Authors
Ahad Gholipoor 1
Mousa Mohammadpourfard 2
1 Department of Mechanical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 Faculty of Chemical and Petroleum Engineering,University of Tabriz, Tabriz, Iran.
Abstract
Despite the unique usage of electrical discharge machining process at machining in small dimensions, machining complex shapes and machining of high-strength parts such as ceramics and heat treated steels, which can’t be machined by traditional machining methods, low machined surface integrity achieved by electrical discharge machining process is one of the most important limitations of this process. In this investigation the machined surface integrity will be improved by applying ultrasonic vibrations to tool electrode and external magnetic field around gap distance of electrical discharge machining process, simultaneously. So several experiments were designed and performed based on full factorial method by selecting pulse current and pulse duration as the most important input parameters, in order to study the effects of pulse current and duration on surface integrity of workpiec machined by this hybrid process and to investigate the effects of tools ultrasonic vibrations and external magnetic field on machined surface roughness and integrity of machined surface. According the results, machined surfaces roughness is increased by applying ultrasonic vibrations to tool electrode and external magnetic field around gap distance of electrical discharge machining process, simultaneously, while the SEM pictures of machined surfaces showed that the, amount of created surface cracks, blowholes, globules and beads of debris are decreased and integrity of machined surfaces by EDM process is improved by applying ultrasonic vibrations to tool electrode and external magnetic field around gap distance, simultaneously.
Keywords
Electrical discharge machining
External Magnetic Field
Tools Ultrasonic Vibrations
Machined Surface Integrity

Subjects

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Modares Mechanical Engineering
Volume 18, Issue 7
November 2018
Pages 97-107