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    Application of Taguchi method for determining optimum surface roughness in turning of high-alloy white cast iron
    (Elsevier Sci Ltd, 2013) Gunay, Mustafa; Yucel, Emre
    This paper focused on optimizing the cutting conditions for the average surface roughness (R-a) obtained in machining of high-alloy white cast iron (Ni-Hard) at two different hardness levels (50 HRC and 62 HRC). Machining experiments were performed at the CNC lathe using ceramic and cubic boron nitride (CBN) cutting tools on Ni-Hard materials. Cutting speed, feed rate and depth of cut were chosen as the cutting parameters. Taguchi L-18 orthogonal array was used to design of experiment. Optimal cutting conditions was determined using the signal-to-noise (S/N) ratio which was calculated for R-a according to the the-smaller-the-better approach. The effects of the cutting parameters and tool materials on surface roughness were evaluated by the analysis of variance. The statistical analysis indicated that the parameters that have the biggest effect on R-a for Ni-Hard materials with 50 HRC and 62 HRC are the cutting speed and feed rate, respectively. Additionally, the optimum cutting conditions for the materials with 50 HRC and 62 HRC was found at different levels. (C) 2012 Elsevier Ltd. All rights reserved.
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    An Evaluation on Machining Processes for Sustainable Manufacturing
    (Gazi Univ, 2013) Gunay, Mustafa; Yucel, Emre
    Sustainable manufacturing consists of environmental protection, profitability and societal benefit for all industrial areas. Manufacturing practices are investigated for optimize production efficiency while minimizing environmental impact and maintaining social equity. It can be achieved through changes in products, processes and systems related to the sustainability issues. In sustainable manufacturing process, the natural resources which are key elements of sustainability must be used prudently by academic, scientific, cultural and human organizations. In this context, sustainable machining can be defined as a process which has been performed of sustainable manufacturing by using alternative machining technologies such as cryogenic machining, high pressure jet assisted machining. Sustainable machining investigates the conflict and synergy between economical and environmental considerations as well as the effect of system boundaries in determining optimum machining conditions. This paper presents a general evaluation on the importance of sustainable machining technologies in obtaining sustainable manufacturing objectives.
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    Modelling and optimization of the cutting conditions in hard turning of high-alloy white cast iron (Ni-Hard)
    (Sage Publications Ltd, 2013) Yucel, Emre; Gunay, Mustafa
    The aim of this study is to model and optimize the cutting conditions for the cutting force (F-c) and average surface roughness (R-a) that result from the machining of high-alloy white cast iron (Ni-Hard). The hard turning experiments were carried out on a CNC lathe with ceramic and CBN inserts. Cutting tool material, cutting speed, feed rate and depth of cut were chosen as the cutting conditions (control factors). Taguchi's L-18 orthogonal array was used for design of experiment. Optimum levels of the cutting conditions were determined using signal-to-noise (S/N) ratio, which was calculated for machining output variables (F-c and R-a) according to the the-smaller-the-better' approach. The effects of the cutting conditions on machining output variables were evaluated by the analysis of variance. The analysis of variance results showed that the depth of cut and feed rate were the most significant factors on F-c and R-a, respectively. Besides, the optimal cutting conditions for main cutting force and surface roughness were found at the different levels.