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
workpiece and wire electrode which results in high discharge energy per spark. But further increase of servo
voltage will not favor in the cutting speed as the large amount of debris are unable to clear off the gap for a given
pulse –off time.
3.5. Effect of wire feed rate
The effect of wire feed rate on cutting speed is represented in figure no. 6 keeping others fixed parameters such
as pulse on time 108µs ,pulse off time 35µs ,servo voltage 20 V, discharge current 120A and servo feed 2080,
Wire Tension 10 N.
Figure No. 6
It is clear from figure no. 6 cutting speed increases with increases of wire feed from 3 meters per min to 5meters
per min. But further increase of wire feed rate has no influence on cutting speed. It implies that with these
discharge parameters, eroded debris are easily clear off from the spark gap at a wire feed rate of 5m/min.
4. Conclusions:
In this work, machinability of Nimonic-90 has been evaluated on wire electrical discharge machining (WEDM)
process. Cutting speed has been considered as machinability attribute in present work. Influence of WEDM
parameters namely discharge current (Ip), pulse on time (Ton), pulse off time (Toff), servo voltage (SV) and
wire feed rate (WF) were investigated on cutting speed of Nimonic-90. Based on the experimentation, WEDM
parameters namely discharge current, pulse-on time and pulse-off time produces highly noticeable effect on
cutting speed.
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