Browsing by Subject "Drilling performance"

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    Energy based investigation of process parameters while drilling carbon fiber reinforced polymers
    (Elsevier B.V., 2016) Karpat, Yiğit; Bahtiyar, O.
    Carbon fiber reinforced polymers (CFRPs) are widely used in the aerospace industry due to their light weight, high strength, and low thermal conductivity. Drilling is a critical process that affects the quality of CFRP parts. This work studies the influence of process parameters on delamination and tool wear. Polycrystalline diamond helical drills are used in the experiments. It has been shown that drilling energy calculations can be used to set appropriate feed and speed parameters and for increasing drilling performance of CFRPs. The results also indicate the importance of thermal modeling of CFRP laminate for better understanding of the drilling process. © 2016 The Authors.
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    ItemOpen Access
    Experimental evaluation of polycrystalline diamond tool geometries while drilling carbon fiber-reinforced plastics
    (Springer, 2014) Karpat, Y.; Deǧer, B.; Bahtiyar, O.
    Polycrystalline diamond (PCD) drills are commonly employed in carbon fiber-reinforced plastic (CFRP) drilling to satisfy hole quality conditions with an acceptable tool life and productivity. Despite their common use in industry, only a small number of studies have been reported on drilling CFRPs with PCD drills. In this study, drilling performances of three different PCD drill designs are investigated experimentally using thrust force, torque, and hole exit quality measurements. Results show that work material properties, drilling conditions, and drill design should all be considered together during the selection of process parameters, and the relationships among these factors are quite complex.