Yazar "Kshitij, G." seçeneğine göre listele

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    In pursuit of sustainability in machining thin walled α-titanium tubes: An industry supported study
    (Elsevier, 2023) Khanna, Navneet; Kshitij, G.; Solanki, Malhar; Bhatt, Tathya; Patel, Om; Uysal, Alper; Sarikaya, Murat
    Cryogenic machining has emerged as a major sustainable machining techniques especially for difficult-to-cut alloys, including titanium, Inconel alloys in terms of its impact on cost savings for high-value manufacturing projects reduced energy consumption, enhanced worker safety, and eliminating the infrastructure and disposal needed for flood coolants. However, further study is needed to quantify the sustainable elements of machining processes to have a clearer vision for industries to transition from traditional techniques to such advanced techniques. In the currently known literature, the topic of high-speed machining of titanium tubes with thin walls is yet to be explored under advanced cooling technique. The studies on the machinability indicators including tool wear, power consumption etc. are the backbone to the assessment of sustainability aspect of machining. The quantification of sustainability indicators in terms of machining costs and carbon emissions will provide better insights to the industries to maximise their profits and have least negative impacts on the environment. Thus, this study focuses on analyzing sustainability of the machining processes in terms of economic and environmental factors while turning thin walled a-titanium tubes under different cutting environments which include dry, wet and cryogenic machining under two different high cutting speeds of 150 m/min and 200 m/min. The economical aspect comprises the assessment of the different machining costs occurring during the machining. The environmental aspect includes the assessment of carbon emissions occurring during the machining operation. The backbone of the sustainability analysis is the machinability analysis which involves the investigation of power consumption and cutting tool-wear. A comprehensive study of tool wear and total power consumption has been presented to get a better perspective in the machinability of thin walled a-titanium tubes while working in the cryogenic environment in comparison with dry and wet environments. The total machining cost is relatively less (approximately 27%) under cryogenic environment in comparison with a wet environment making it a more economical process. The total emissions of carbon are also found to be lowered (up to 9%) while machining under cryogenic environment in comparison with a wet environment making it a more environmentally friendly process. The cutting tool wear is found to be relatively low (up to 38.68% and 72.24%) under cryogenic environment in comparison with wet and dry environments respectively. Power consumption was compared for the three different environments to have detailed analysis in terms of productivity and sustainability. A significant reduction in total power consumption (up to 19.25%) was observed under cryogenic environment in comparison with wet environment.
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    Öğe
    Investigation on the effect of hybrid nanofluid in MQL condition in orthogonal turning and a sustainability assessment
    (Elsevier, 2023) Usluer, Enes; Emiroglu, Ugur; Yapan, Yusuf Furkan; Kshitij, G.; Khanna, Navneet; Sarikaya, Murat; Uysal, Alper
    The installation of cost-and energy-efficient chip removal processes is the key point for sustainability. In the literature, many sustainability assessments have been made for minimum quantity lubrication (MQL) and mono nanofluid-assisted MQL (N-MQL) methods, considering energy consumption and costs. However, there are de-ficiencies in the assessment of sustainability in terms of machining cost and carbon emission amount in studies using the hybrid nanofluid MQL (HN-MQL) method. In the presented study, the Taguchi experiment design was established with different cutting conditions (dry, MQL, 0.2% MWCNT nanoparticle reinforced N-MQL, 0.1% MWCNT+0.1% MoS2 nanoparticle reinforced HN-MQL), different cutting speeds (175, 225, 275 and 325 m/ min), and different feed values (0.1, 0.15, 0.2 and 0.25 mm/rev) in the orthogonal turning of S235JR structural steel, and optimum cutting parameters were determined in terms of cutting temperature and cutting forces by ANOVA analysis. This was followed by the sustainability assessment of the experiments conducted to quantify the sustainability aspect of machining in terms of total machining costs and total carbon emissions. While assessing machinability parameters, it was found that the best results out of all the performed experiments for both cutting forces and cutting temperatures were obtained under N-MQL conditions. It was determined that the most effective parameter on cutting force and thrust force was feed with 86.8% and 65% contribution ratios, respectively, and cutting conditions had the most effect on cutting temperature with 93.2% contribution ratio. The total machining cost were lowered by significant amount (up to 76%, 73% and 61% in comparison with dry, MQL and HN-MQL) under N-MQL cutting environment owing to the reduction in energy consumption and better tool life in comparison with other parameters. The overall carbon emissions were also most optimal (better by up to 60% and 37% in comparison with MQL and HN-MQL) under the N-MQL cutting environment in comparison with other cutting environments. The sustainable aspects of the machining process were enhanced more under higher cutting speeds than under lower cutting speeds.
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    Öğe
    Resource conservation and sustainable development in the metal cutting industry within the framework of the green economy concept: An overview and case study
    (Elsevier, 2022) Kshitij, G.; Khanna, Navneet; Yildirim, Cagri Vakkas; Dag, Salih; Sarikaya, Murat
    The metal cutting industry has an important role in the growth of the global economy. In this industry, while research is made on factors such as cutting tool, cooling/lubrication environments, improved cutting parameters, etc., for increased productivity, serious efforts are also made to obtain environmentally friendly and healthy processes. Based on recent developments in tool materials, cutting speeds have increased significantly in machining operations. However, the increased temperatures with increasing cutting speeds have also reduced productivity and caused resource and product losses. The use of cutting fluids, especially in the machining of superalloys, has a vital task in reducing the problems. However, petroleum-based cutting fluids, which are still frequently used and have an important share in the industry, do not comply with the concept of a green economy due to environmental effects and costs. For this reason, the use of sustainable cutting fluids and optimum pa-rameters in metal cutting industry processes has become a necessity. From this perspective, this study was carried out in two stages. In the first stage, the outputs of the metal cutting industry were examined within the scope of the principles of green economy. In the second stage, a case study was then conducted involving the machining of Inconel 718 and Ti6Al4V alloys at different cutting speeds and under LCO2. In the case study, critical outputs, both from an economic and sustainability point of view, namely cutting tool wear, surface roughness, specific energy consumption, machining costs and carbon emissions are examined. The results obtained in the machining of both materials were compared with each other. Total cost and carbon emissions can be reduced by up to 35% and 7%, respectively, under the appropriate parameter combination and LCO2 cooling conditions.