DRILLING CHARACTERISTICS STUDY ON HUMAN HAIR REINFORCED PLASTIC COMPOSITES

The manufacturing of the natural fibre reinforced composite can broadly be
classified as primary and secondary manufacturing. Primary manufacturing
processes are hand lay-up, Pultrusion, filament winding, vacuum bag
moulding and resin transfer moulding. Secondary manufacturing include
drilling, cutting and surface finishing. Hole making is one of the important
machining operations to facilitate the assembly operations. Though a number
of approaches have been used for making holes in composite laminates,
conventional drilling till date is the most widely acceptable and frequently
practiced machining operation for hole making. Conventional drilling however
results in damage in the form of delamination, micro cracks, fiber pull out
and matrix burning around the hole and may ultimately cause variation in
the strength of the component with a drilled hole. The objective of this work
is Minimize delamination damage and Maximize residual tensile strength. In
this work, experiments were carried out as per the Taguchi experimental
design hole by varying the parameters speed in the range of (500-1500) point
angle in the range of (90-110) Feed in the range of (0.02-0.06) and result are
analysed using Analysis of variance (ANOVA) technique to know the
percentage contribution of each factor on residual tensile strength, and
delamination damage of the hole