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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
IJEMS Vol.17(2) [April 2010] >
| Title: | Analysis and evaluation of heat affected zones in electric discharge machining of EN-31 die steel |
| Authors: | Choudhary, Rajesh
Kumar, H
Garg, R K |
| Keywords: | Electrical discharge machining
Surface integrity
Metal removal rate
Surface roughness
Heat affected zone |
| Issue Date: | Apr-2010 |
| Publisher: | CSIR |
| Abstract: |
In this paper investigations are conducted
on the machining of EN-31 die steel with different electrode materials (copper,
brass and graphite) with electrical discharge machining (EDM) process. This study
presents the analysis and evaluation of heat affected zones (HAZ) of the
workpiece surfaces machined using different tool electrodes by EDM. The kerosene
oil of commercial grade has been used as dielectric fluid. The effect of
various important EDM parameters such as pulse duration, peak current and
discharge gap voltage has been investigated to yield the responses in terms of
material removal rate (MRR) and surface roughness (SR). Further the detailed
analysis of heat affected regions has been carried out by using scanning
electron microscopy (SEM) and optical microscopy (OM).
Experimental results indicate that copper as a tool electrode shows a good
response towards MRR, whereas brass gives superior surface finish as compared
to other tool electrodes. From the microstructural analysis study it has been
observed that heat affected zone is much deeper in the specimen machined by
graphite electrode as compared to other tool electrodes.
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| Page(s): | 91-98 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.17(2) [April 2010]
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