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    Chemical etching of Cu-ETP copper
    (Elsevier Science Sa, 2005) Çakir, O; Temel, H; Kiyak, M
    Chemical etching is the controlled dissolution of workpiece material by contact with strong chemical solution. The process can be applied to any material. Copper is one of the extensively used engineering material in the fabrication of microelectronic components, microengineered structures and precision parts by using chemical etching process. In this study, copper is chemically etched. with two different etchants (ferric chloride and cupric chloride) at 50 degrees C. The effects of selected etchants and machining conditions on the depth of etch and surface roughness were investigated. The experimental study provided that ferric chloride produced the fastest chemical etch rate, but cupric chloride produced the smoothest surface quality. (c) 2005 Elsevier B.V. All rights reserved.
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    Öğe
    Comparison of gases applications to wet and dry cuttings in turning
    (Elsevier Science Sa, 2004) Çakir, O; Kiyak, M; Altan, E
    In recent years, by the progresses in manufacturing industry, great changes have especially been observed in machining of metals. All cutting parameters have already been investigated in order to advancing the properties of cutting tools and machine tools. These researches have improved material removals rate, decreased manufacturing time and resulted minimum cutting energy. The effects of dry and wet cuttings have widely been examined on metal machining. In this study, the effects of cutting fluid, some gases applications and dry cutting on cutting forces, thrust forces, surface roughness, friction coefficient and shear angle have been examined in turning of AISI1040 steel material. Nitrogen, oxygen and carbon dioxide gases instead of cutting fluid have been used and compared to wet and dry machining processes. Experiments have been performed at constant cutting speed for three different cutting depths and feeds. The application of gases produced lower cutting force comparing to dry and wet cutting. The values of surface roughness were slightly closed. Gases applications in turning provided higher shear angle value than dry and wet cutting. (C) 2004 Elsevier B.V. All rights reserved.
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    Öğe
    Study of tool wear and surface roughness in machining of homogenised SiC-p reinforced aluminium metal matrix composite
    (Elsevier Science Sa, 2005) Kiliçkap, E; Çakir, O; Aksoy, M; Inan, A
    Metal matrix composites (MMC) have become a large leading material in composite materials and particle reinforced aluminium MMCs have received considerable attention due to their excellent engineering properties. These materials are known as the difficult-to-machine materials, because of the hardness and abrasive nature of reinforcement element like silicon carbide (SiC) particles. In this study, homogenised 5% SiC-p aluminium MMC material was selected for experimental investigation of tool wear and surface roughness. Two types of K10 cutting tool (uncoated and TiN-coated) were used at different cutting speeds (50, 100 and 150 m/min), feed rates (0.1, 0.2 and 0.3 mm/rev) and depths of cut (0.5, 1 and 1.5 mm). In dry turning condition, tool wear was mainly affected by cutting speed, increased with increasing cutting speed. Tool wear was lower when coated cutting tool was used in comparison to uncoated one. Surface roughness influenced with cutting speed and feed rate. Higher cutting speeds and lower feed rates produced better surface quality. (c) 2005 Elsevier B.V. All rights reserved.