OCTOBER 19-20, 2012 - YMCA University of Science & Technology

3.2 Effect of Different Dielectric Fluid
Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
The effect of the use of different dielectric also affects the top surface temperature distribution of the workpiece.
The change of dielectric results in change in breakdown voltage. The published machining handbook [9] were
chosen for the present analysis .The two different values of dielectric, 30V, 40V and 50V were taken for the
present study. Increase in breakdown voltage results in increase in top surface temperature since the more heat
flux enters the workpiece compared to lesser breakdown voltage. Fig. 13 has shown the effect of breakdown
voltage on top surface temperature distribution in workpiece.
Figure 11 Top surface temperature along AA for different breakdown voltage
Figure 12 Top surface temperature along AA for different breakdown voltage
4. Conclusion
The main objective of this present work is to simulate the ECSM process to determine the temperature
distribution and thermal stress distribution induced in the workpiece. The simulation code is developed in APDL
and the result presented here would be useful for the prediction of temperature distribution in the workpiece
before going for an actual time consuming experimental procedure. Major contribution to the temperature
distribution was by the EDM process. The result shows that the node which had more sparks was in high
temperature than the other nodes with less number of sparks. The following points have been concluded for the
present simulation work.
1. EDM contributes primarily to the temperature distribution due to its high heat input.
2. The EDM assist the ECM in material removal by thermally softening the material and result in
increasing chemical reaction.
3. High thermal gradient exist near the top surface which primarily contribute the thermal stress.
5. References
1. Mcgeough, J.A., 1984. Principles of Electrochemical Machining. Chapman and Hall, London.
2. Basak, I., Ghosh, A., 1997. Mechanism of material removal in electrochemical discharge machining: a
theoretical model and experimental verification. J. Mater. Process. Technol. 71, 350–359.
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