Yazar "Cakir, Orhan" seçeneğine göre listele

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    The dependence of tool overhang on surface quality and tool wear in the turning process
    (Springer London Ltd, 2010) Kiyak, Murat; Kaner, Billur; Sahin, Ibrahim; Aldemir, Bilal; Cakir, Orhan
    In the turning process, the importance of machining parameter choice is increased, as it controls the surface quality required. Tool overhang is a cutting tool parameter that has not been investigated in as much detail as some of the better known ones. It is appropriate to keep the tool overhang as short as possible; however, a longer tool overhang may be required depending on the geometry of the workpiece and when using the hole-turning process in particular. In this study, we investigate the effects of changes in the tool overhang in the external turning process on both the surface quality of the workpiece and tool wear. For this purpose, we used workpieces of AISI 1050 material with diameters of 20, 30, and 40 mm; and the surface roughness of the workpiece and tool wear were determined through experiments using constant cutting speed and feed rates with different depth of cuts (DOCs) and tool overhangs. We observed that the effect of the DOC on the surface roughness is negligible, but tool overhang is more important. The deflection of the cutting tool increases with tool overhang. Two different analytical methods were compared to determine the dependence of tool deflection on the tool overhang. Also, the real tool deflection values were determined using a comparator. We observed that the tool deflection values were quite compatible with the tool deflection results obtained using the second analytical method.
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    Öğe
    Investigation of mechanical and machinability properties of SiC particle reinforced Al-MMC
    (Elsevier Science Sa, 2008) Ozben, Tamer; Kilickap, Erol; Cakir, Orhan
    The paper presents the results of experimental investigation on mechanical and machinability properties of silicon carbide particle (SiC-p) reinforced aluminium metal matrix composite. The influence of reinforced ratios of 5, 10 and 15 wt.% of SiC-p on mechanical properties was examined. The effect of machining parameters, e.g. cutting speed, feed rate and depth of cut on tool wear and surface roughness was studied. It was observed that increase of reinforcement element addition produced better mechanical properties such as impact toughness and hardness, but tensile strength showed different trend; increased upto 10 wt.% of SiC-p reinforced and then decreased when 15 wt.% of SiC-p reinforcement addition. Machinability properties of the selected material were studied and higher SiC-p reinforcement produced a higher tool wear; surface roughness was generally affected by feed rate and cutting speed. (C) 2007 Elsevier B.V. All rights reserved.
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    INVESTIGATION OF REINFORCEMENT RATE AFFECTING MECHANICAL PROPERTIES AND MACHINABILITY IN Al-SiCp MMCs
    (Pamukkale Univ, 2006) Kilickap, Erol; Ozben, Tamer; Cakir, Orhan
    In this study, the effects of various rate of reinforcement materials (SiCp) addition to Al Si7 Mg2 metal matrix composite on mechanical properties and machinability were investigated. It was noticed that the mechanical properties increased with increasing added reinforcement materials rate in 5, 10 and 15 % SiCp reinforced metal matrix composite. The investigation of tool wear and surface roughness was carried out by using different cutting speeds (50, 100 and 150 m/min) and feed rate (0.1, 0.2 and 0.3 mm/rev) at constant depth of cut (1.5 mm) and reinforcement rates. It was observed that, tool wear and surface roughness increased when reinforcement material rate raised at using the same cutting speed and feed values. The tool life was a maximum when 15 % SiCp reinforced metal matrix composite was machined at 150 m/min of cutting speed. The highest surface roughness was also noticed at 15 % SiCp reinforced metal matrix composite machined at 50 m/min of cutting speed and 0.3 mm/rev of feed.