Heat Transfer Analysis Of The EDM Process On
Silicon Carbide
Author(s)
R. Mahdavinejad
Abstract
The Electro discharge machining (EDM) process is based on the generation of a
plasma channel, its growth and the creation of a boiling crater on the workpiece
surface. Material removal is mainly due to the presence of thermodynamic
forces. Therefore, the process is under the influence of the heat transfer
behaviour of the plasma channel and the workpiece. In the heat transfer
mechanism, heat conduction is known to be the main major mode. Besides, there
is another heat source within the silicon carbide body due to its electrical
resistance and it results in Joule Heating. The physical properties of SiC material
such as its electrical resistance and thermal conductivity are highly affected by
temperature. This paper deals with the solution of the heat conduction and
voltage drop equations within the workpiece in a cylindrical coordinate system
on a finite cylinder regarding the circular plasma heat source. The finite
difference method is used to solve these equations. Calculations show that
voltage drops within the SiC body are higher than ones expended on the
workpiece surface by a plasma channel. Results also show that an increase in
discharge current increases the voltage drops and heat generation within the
workpiece body while affecting deeper areas.
Keywords: heat transfer, electro-discharge machining, silicon carbide, plasma
channel, finite difference.
1 Introduction
Silicon Carbide (SiC) is the fourth hardest material in the world only after
diamond, Boron nitride and Boron carbide. It is widely used in industry due to its
special specifications as described in Table 1.
Its high hardness, low conduction of electricity and heat, and also good heat
shock resistance which make it suitable for use in furnace as heat-element, in
Keywords
heat transfer, electro-discharge machining, silicon carbide, plasma
channel, finite difference.
Related Book
Other papers in this volume
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