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

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
with a convective coefficient of 10,000 W/m 2 K. The domain is discretized using 8 – noded brick element (Fig.
4). In order to capture more information in the grinding zone, the mesh was made very fine. Convergence test
revealed that the mesh of 7904 elements and 9477 nodes is adequate for the problem
Figure 4 Discretized workpiece used in the simulation of surface grinding
The small cylindrical domain is considered to have diameter 3 times the spark radius and height in such a way
that there is no heat transfer from the bottom surface as shown in the Fig. 5. It is assumed the sparks are far away
from each other and interaction of sparks in the process of determination of temperature in the EDM operation is
neglected. The domain of EDM exhibits the axis symmetry so it has to be properly captured in the meshing.
Convergence test revealed the mesh of 50700 elements and 54106 nodes are adequate to capture the symmetric
nature of the domain
Figure 5 Discretized cylindrical domain used for the simulation of EDM process
(a)
(b)
Figure 6 3-D top surface temperature distribution in the grinding zone of the HSS workpiece due to (a) EDM
only (b) ECSM
Fig. 7 shows the top surface of the domain. Here the certain lines are taken to study the temperature distribution
due to EDDG. The line AA is parallel to X–axis is at Z = 5.7 mm and the line BB is parallel to Z-axis is at X = 8
mm. the Fig. 8 shows the depth distribution of temperature (at X = 11.5 mm, Z =5.6 mm) and it is observed that
the high temperature gradient exist which primarily induces the thermal stress.
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