Affiliation:
1. Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai 600-062, India
Abstract
Background:
Natural fiber reinforced materials with polymer matrix finds many applications
in industries due to its excellent property. Fiber laminate composite materials have been researched
around the globe and were tested to determine its beneficial properties for specific purposes.
These composite materials have improved to withstand external loads. However, drilling of composite
has remained a difficult task because of its anisotropic material properties.
Methods:
In this study abaca and kenaf woven mat with the carbon woven mat are laminated using
epoxy resin (HY 951) and hardener (LY556) as matrix element while preparing the hybrid composite
materials. The drilling operations are carried out using automatic feed computer controlled vertical axis
drilling machine.
Results:
It is found that the drilling force, delamination peel up and push out for the composite material
depended on feed rates, drill bit diameters and speeds respectively. The optimal input parameters are
obtained using Taguchi L27 orthogonal array, Response Surface Methodology (RSM) and Analysis Of
Variance (ANOVA) methods. It is observed that lower feed, smaller drill diameter and moderate speed
provided high quality drilled hole. The drilled-hole quality, drilling damages are observed by using
profile projector.
Conclusion:
The following conclusion can be drawn from the present investigation on drilling of reinforced
composite materials drilled in different conditions. Feed rate is the important factor compared to
the feed and the tool diameter. When feed rate is increased, thrust force also increases. However, thrust
force decreases when the cutting speed increases. Feed influenced the thrust force instead of speed and
torque during drilling. The drilling induced damages are minimum during lower feed and lower diameter
drill. Hence, lower drill diameter, lower feed rate and medium speed are more suitable for drilling
the hybrid composites.
Publisher
Bentham Science Publishers Ltd.
Subject
General Materials Science
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