Publication

Temperature measurements and numerical analysis of the heat transfer in samples submitted to electron discharge machining (EDM)

Michel Rappaz
2004
Conference Papers

Abstract

Matter removal in the electron discharge machining (EDM) is essentially due to a thermal mechanism. The control of the thermal process (i.e. the time dependent energy flow given by the discharge and the local temperature evolution) is therefore of crucial importance for efficiency and surface quality improvement. We report the first results of our research aimed at determining these quantities. Two types of measurements have been performed at the global and single discharge scale. 1) In-depth temperature measurements in a workpiece submitted to EDM with semi-finishing standard settings. 2) Local measurements of the thermal response due to single discharges using a high resolution thermal device fabricated in our laboratory.

Official source

https://infoscience.epfl.ch/entities/publication/de91c75b-44aa-421a-bdaf-9d0936937d34

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Michel Rappaz
2004
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/de91c75b-44aa-421a-bdaf-9d0936937d34

About this result

Related concepts (32)

Corona discharge

A corona discharge is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor carrying a high voltage. It represents a local region where the air (or other fluid) has undergone electrical breakdown and become conductive, allowing charge to continuously leak off the conductor into the air. A corona discharge occurs at locations where the strength of the electric field (potential gradient) around a conductor exceeds the dielectric strength of the air.

Glow discharge

A glow discharge is a plasma formed by the passage of electric current through a gas. It is often created by applying a voltage between two electrodes in a glass tube containing a low-pressure gas. When the voltage exceeds a value called the striking voltage, the gas ionization becomes self-sustaining, and the tube glows with a colored light. The color depends on the gas used. Glow discharges are used as a source of light in devices such as neon lights, cold cathode fluorescent lamps and plasma-screen televisions.

Partial discharge

In electrical engineering, partial discharge (PD) is a localized dielectric breakdown (DB) (which does not completely bridge the space between the two conductors) of a small portion of a solid or fluid electrical insulation (EI) system under high voltage (HV) stress. While a corona discharge (CD) is usually revealed by a relatively steady glow or brush discharge (BD) in air, partial discharges within solid insulation system are not visible. PD can occur in a gaseous, liquid, or solid insulating medium.

Related publications (21)

Temperature measurements and numerical analysis of the heat transfer in samples submitted to electron discharge machining (EDM)

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