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Öğe Effects of cutting parameters and point angle on thrust force and delamination in drilling of CFRP(De Gruyter, 2014-11-14) Çelik, Yahya Hışman; Kılıçkap, Erol; Yardımeden, AhmetParts made of composite materials are generally produced by near-net-shape technology. However, additional machining operations such as drilling are often required to facilitate components assembling. Drilling of composite materials is also a common process in the assembly of aerospace and automotive composite structures. During drilling, unlike the conventional materials, a few damage forms may take place. Among these damage forms, the delamination is the most important one. Therefore, the experimental studies carried out on drilling of CFRP composite materials for determining optimum processing parameters are of great importance. In this particular study, delamination in CFRP composites caused by drilling was investigated. The composite material was drilled under various spindle speeds, feed rates and drill point angles. The results showed that delamination and thrust forces were affected by cutting parameters. It was demonstrated that feed rate and drill point angle make the largest contribution to the overall performance.Öğe AL/SiC Kompozit malzemenin delinmesinde yüzey pürüzlülüğünün bulanık mantıkla modellenmesi(Dicle Üniversitesi, 2016) Çelik, Yahya Hışman; Yenigün, Burak; Kılıçkap, ErolBu çalışmada, sıkıştırma döküm yöntemiyle üretilmiş SiC takviyeli Al esaslı kompozit kullanılmıştır. Üretilen kompozit malzeme farklı uç açılarına sahip HSS takımlar kullanılarak; farklı delme parametrelerinde delme işlemine tabi tutulmuştur. Her bir delme işlemi için delme yüzeylerinin yüzey pürüzlülükleri ölçülmüştür. Elde edilen veriler bulanık mantığa uygulanarak yüzey pürüzlülüğünün modellenmesi yapılmıştır. Veriler incelendiğinde, en iyi yüzey pürüzlülüğü 90˚ uç açısına sahip takım kullanılarak 1500 dev/dak dönme devri ile 0.05 mm/dev ilerleme değerinde elde edilmiştir. En kötü yüzey pürüzlülüğü ise 118˚ uç açılı takımın 2000 dev/dak dönme devri ile 0.15 mm/dev ilerleme değerinde elde edilmiştir. Bulanık mantık kullanılarak elde edilen tahmini değerlerin deney sonuçlarına yakın değerler verdiği görülmüştürÖğe Investigation of the most suitable drilling parameters and power consumption for energy saving(Batman Üniversitesi, 2022-07-02) Adin, Mehmet ŞükrüDue to the continuous increase in the cost of energy used in the manufacturing industry, the cost of the product is also increasing. Therefore, studies that do not affect product quality and save energy gain importance. For this purpose, in this study, the minimum amount of energy required to obtain the best hole surface quality was investigated by blind drilling of the AISI 4140 workpiece with a 5.2 mm diameter AISI M2 HSS drill at different spindle speeds (1000, 2000, 3000 rev/min) and different feed rates (150, 200, 250 mm/min). When the effects of drilling parameters on the surface roughness were examined, it was understood that it tended to decrease depending on the increase in the number of revolutions, and increased depending on the increase in the feed rate. It has been understood that the power required (consumed) of the CNC vertical machining center to open blind holes on the workpiece increases in direct proportion to the increase in cutting and feed rate. It was found that 3000 rpm and 150 mm/min feed rate were the most suitable machining parameters for the lowest surface roughness and the required optimum power value was 3.14 watts. As a result of the study, it has been understood that at least 11% energy saving can be achieved thanks to the determined parameters and optimum power value.
