Kamlesh Phapale

Abstract:

Composite materials are the emerging material for enormous applications in various engineering domains, due to its extremely high strength to weight ratio and corrosion resistance properties. The composite laminates are difficult to machine materials, which results into low drilling efficiency and drilling-induced delamination. Drilling is a widely used technique to assemble components specifically, in more complex structures. In the aircraft industry, about 60% of part rejections come from drilling-associated delamination. This study presents the experimental characterization to understand the effect of cutting parameters used for drilling holes on the thrust force, delamination extent, hole surface roughness and exit hole diameter using two-flute solid carbide twist drill of diameter 6.35mm. It also describes the identification of critical thrust force below which no damage occurs. The analysis shows that feed rate plays a dominant role in delamination, thrust force, hole surface roughness and exit hole diameter than the spindle speed.