Karbon Siyahı Takviyeli Elektriği İleten Polipropilen Kompozite Delik Delinmesinde İşlem Parametrelerinin İncelenmesi

Polimer kompozit malzemeler, uçak-uzay, otomotiv, elektrik-elektronik sanayisinde, denizcilik ve spor ekipmanları gibi birçok alanda kullanılmaktadırlar. Her endüstriyel sektör farklı özellikte malzemeler talep etmektedir. Polimer malzemelerden yüksek özgül dayanım ve rijitlik özelliklerinin yanında elektrik iletkenliğinin de beklendiği uygulamalarda, karbon siyahı, karbon fiber, grafit, grafen, metal ve metal oksitler, karbon nano tüp gibi elektrik iletkenliği yüksek malzemelerin katılmasıyla elde edilen kompozit malzemeler kullanılabilmektedir. Bu çalışmada, yalın ve karbon siyahı takviyeli elektriği ileten polipropilen (PP) malzemeler, farklı kesme hızı ve ilerleme değerlerinde ve farklı uç açısına sahip matkap uçları ile delinmiş ve kesme sıcaklığı, delik içi yüzey pürüzlülüğü ve talaş formları incelenmiştir. Küçük yüzey pürüzlülüğü, yüksek kesme hızı ve küçük ilerlemede elde edilirken, düzenli talaş formaları ve düşük sıcaklıklar, küçük kesme hızı ve yüksek ilerlemede gözlemlenmiştir. Karbon siyahı takviyeli polipropilen malzemenin delinmesinde yalın polipropilen malzemeye göre daha küçük yüzey pürüzlülüğü, daha düşük sıcaklık ve düzenli talaş formları elde edilmiştir. Ayrıca, küçük uç açılı matkap ucunun daha iyi performans gösterdiği gözlemlenmiştir.

Investigation of Process Parameters in Drilling of Carbon Black Reinforced Electrically Conductive Polypropylene Composite

Polymer composite materials have been used in many fields such as aircraft and aerospace, automotive, electrical and electronic industries, marine and sport equipments. Each industrial sector demands different properties that the composite material must satisfy. Composite materials which are obtained by reinforcing high electrically conductive materials such as carbon black, carbon fiber, graphite, graphene, metals and metal oxides, carbon nanotubes can be employed in applications that demand the electrical conductivity besides high specific strength and stiffness properties of polymer materials. In this study, neat and carbon black reinforced electrically conductive polypropylene (PP) materials were drilled at different cutting speed and feed values and with drill tools having different drill point angle and cutting temperature, surface roughness of holes, and chip forms were investigated. Regular chip forms and low temperatures were observed at small cutting speed and high feed while small surface roughness was obtained at high cutting speed and small feed. In drilling of carbon black reinforced polypropylene, smaller lower surface roughness, lower temperature, and more regular chip forms were obtained as compared to neat polypropylene. In addition, it was observed that the drill tool with small point angle showed better performance.

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