Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

HEAT AND MASS TRANSFER IN SPARK MACHINING

Get access (open in a dialog) DOI: 10.1615/IHTC6.4060
pages 73-78

Abstrakt

A spark can be made through a liquid dielectric between two electrodes. A column of gas forms. The arc provides thermal energy for heating small areas on the electrodes. Some of the metal becomes vapor; some melts. Some of the molten metal is ejected before the arc stops. Very soon after the arc stops the molten metal solidifies. Some of the molten metal is retained by viscous forces, or because of its inertia. The metal which is ejected is forced out by the pressures developed in the plasma jet. The overall phenomenon of spark-machining involves thermodynamics, fluid mechanics, metallurgy and electrical sciences. In this paper we concentrate on two aspects: the heat transfer to the electrode, including its spatial distribution; and an analysis for the motion of the liquid metal, with estimation of the net metal removal.