Browsing by Author "Nalbant, Muammer"

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The Effect of Coating Material and Geometry of Cutting Tool and Cutting Speed on Machinability Properties of Inconel 718 Super Alloys
(Elsevier Sci Ltd, 2007) Nalbant, Muammer; Altin, Abdullah; Gokkaya, Hasan
In this study, the effects of cutting tool coating material and cutting speed on cutting forces and surface roughness are investigated. For this purpose, nickel based super alloy Inconel 718 is machined at dry cutting conditions with three different cemented carbide tools in CNC lathe. Metal removing process is carried out for five different cutting speeds (15, 30, 45, 60, 75 m/min.) while 2 mm depth of cut and 0.20 mm/rev feed rate are to be constant. Main cutting force, F. is considered to be cutting force as a criterion. In the experiments, depending on the tool coating material, lowest main cutting force is found to be 506 N at 75 m/min with multicoated cemented carbide insert whose top layer is coated by Al2O3. Lowest average surface roughness (0.806 mu m) is obtained at the cutting speed of 15 m/min with single coated (TiN) cemented carbide inserts. (c) 2006 Elsevier Ltd. All rights reserved.
The Effect of Cutting Speed and Cutting Tool Geometry on Machinability Properties of Nickel-Base Inconel 718 Super Alloys
(Elsevier Sci Ltd, 2007) Nalbant, Muammer; Altin, Abdullah; Gokkaya, Hasan
The effects of cutting speed and cutting tool geometry on cutting forces are investigated in this study. For this purpose, nickel-base super alloy, Inconel 718, is machined with dry cutting conditions by using digital controlled computer lathe with ceramic cutting tools in two different geometries and three different material qualities. Metal removing process is carried out for four different cutting speeds (150 m/min, 200 m/min, 250 m/min, and 300 m/min), while a cutting depth of 2 mm and a feed rate of 0.20 mm/rev are kept constant. As a result of the experiments, the lowest main cutting force, which depends on tool geometry, is obtained as 672 N with KYON 2100 SNGN 120712 ceramic tool and the maximum cutting force is determined as 1346 N with the ceramic cutting tool having KYON 4300 RNGN 120700 geometry. Depending on the cutting speed, the lowest main cutting force is recorded as 812 N at 250 m/min while the highest main cutting force is recorded as 955 N at 150 m/min. Plastic deformation, flank edge wear, notch and build-up edge are determined in high cutting speeds. (c) 2006 Elsevier Ltd. All rights reserved.
The Effects of a Tool's Chemical Composition on Its Performance When Turning Inconel 718 With Ceramic Inserts
(Assoc Mechanical Engineers Technicians Slovenia, 2007) Altin, Abdullah; Taskesen, Ahmet; Nalbant, Muammer; Seker, Ulvi
The effects of a cutting tool's chemical composition on wear and tool life are investigated. A series of experiments was carried out using silicon-nitrite-based (Si, Al, O, N) and whisker-reinforced ceramic tools (Al2O3+SiCw) that have two different geometries (square and circular) and three different ISO qualities. For the ceramic tools, a high level of aluminum and germanium caused built-up edge (BUE) formation, while notch wear is considered as a cause of high copper and oxygen levels in whisker-reinforced ceramic tools. Four different tools with two qualities showed the best performance at a cutting speed of 200 m/min. The fact that the whisker-reinforced square-type ceramic tools are subjected to plastic deformation is attributed to the high oxygen level in the cutting tool's structure. (C) 2007 Journal of Mechanical Engineering. All rights reserved.
İşleme Parametrelerinden Kesme Hızının Inconel 718 Süper Alaşımın İşlenebilirliğine Etkisi
(2006) Nalbant, Muammer; Gökkaya, Hasan; Altın, Abdullah
Bu çalışmada, nikel esaslı Inconel 718 süper alaşımı; yuvarlak formlu kaplamasız sementit karbür takımla bilgisayarlı sayısal denetimli (BSD) JOHNFORD T35 torna tezgahında, soğutma sıvısı kullanılmadan işlenmiştir. Beş farklı kesme hızı (15, 30, 45, 60, 75 m/min) ile sabit kesme derinliği (2 mm) ve ilerleme hızı (0.20 mm/rev) değerlerinde talaş kaldırma işlemleri gerçekleştirilerek, bu kesme hızlarının asıl kesme kuvveti (Fc) ve yüzey pürüzlülüğü üzerindeki etkileri araştırılmıştır. Yapılan deneylerde kesme hızına bağlı olarak ortalama en düşük asıl kesme kuvveti 75 m/min kesme hızında 629 N, en yüksek asıl kesme kuvveti ise 15 m/min kesme hızında 1150 N elde edilmiştir. En düşük ortalama yüzey pürüzlülüğü 45 m/min kesme hızında 0.45 $\\mu$ m, en yüksek ortalama yüzey pürüzlülüğü ise 75 m/min kesme hızında 0.88 $\\mu$ m elde edilmiştir. Elde edilen talaş biçimi ise sürekli dar ve geniş adımlıdır.