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
200
160
Thrust force [N]
120
80
40
0
0.05 0.1 0.15 0.2
Feed [mm/rev]
1000 rpm 2000 rpm 3000 rpm
Fig 4 (a) Variation of Thrust force with feed rate at different drill Speed
Figure 4 (b) shows the influence of feed rate and the drill diameter on thrust force in drilling of Al/SiC
metal matrix hybrid composites. The feed rate verses thrust force graph shows consistently thrust force is lower
at lower diameter of drill than at higher diameter of drill. Thrust force is low (65 N) at low feed rate, i.e.0.05 mm
/ rev and thrust force is high (153.35 N) at high feed rate, i.e.0.15mm / rev. The reason being the increase of feed
rate increases the load on the tool subsequently increases the thrust force in drilling of hybrid composites.
200
160
Thrust force [N]
120
80
40
0
0.05 0.1 0.15 0.2
Feed [mm/rev]
4 mm 8 mm 12 mm
Fig 4 (b) Variation of Thrust force with feed rate at different drill diameter
Figure 4 (c) show the influence of cutting speed and the drill diameter on thrust force. The speed Vs thrust force
graph shown thrust force gradually decreases by increasing cutting speed from 1000 rpm to 3000 rpm
during drilling of Al / SiC/ graphite hybrid metal matrix composite. The feed rate is the predominant factor and
as the feed rate increases the thrust force increases for the composite.
Davim and Baptista [32]. were under the opinion that regardless of the tool material and work material, the
thrust is highly dependent on feed rate, while cutting speed was found to have insignificant influence on the
degree of drilling forces. Charles Lane [33] was under the opinion that the feed rate was determined to be the
most significant parameter affecting the drill life and tool forces. increasing the feed rate increases cutting force
significantly.
440