Yazar "Guenay, Mustafa" seçeneğine göre listele

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    Comparison of Tool Wear, Surface Morphology, Specific Cutting Energy and Cutting Temperature in Machining of Titanium Alloys Under Hybrid and Green Cooling Strategies
    (Korean Soc Precision Eng, 2023) Gupta, Munish Kumar; Nieslony, P.; Korkmaz, Mehmet Erdi; Kuntoglu, Mustafa; Krolczyk, G. M.; Guenay, Mustafa; Sarikaya, Murat
    Cutting energy must be reduced in order to make machining processes more eco-friendly. More energy was expended for the same amount of material removed, hence a higher specific cutting energy (SCE) implies inefficient material removal. Usually, the type of coolants or lubricants affects the SCE, or the amount of energy needed to cut a given volume of material. Therefore, the present work deals with a study of SCE in the turning of Ti-3Al-2.5V alloy under green cooling strategies. In spite of this, the research effort is also focused on the mechanism of tool wear, surface roughness, and cutting temperature under hybrid cooling, i.e., minimum quantity lubrication (MQL) and cryogenic. The tool wear rate, were explored with tool mapping analysis, and the results were compared with dry, MQL, and liquid nitrogen (LN2) conditions. The tool wear rate analysis claims that the dry condition causes more built up edge (BUE) formation. In addition, the hybrid cooling conditions are helpful in reducing the SCE while machining titanium alloys.
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    Comprehensive analysis of tool wear, surface roughness and chip morphology in sustainable turning of Inconel-601 alloy
    (Elsevier Sci Ltd, 2023) Korkmaz, Mehmet Erdi; Gupta, Munish Kumar; Guenay, Mustafa; Boy, Mehmet; Yasar, Nafiz; Demirsoez, Recep; Ross, K. Nimel Sworna
    The objective of this research was to explore the impact of various cooling conditions on machinability, as potential alternatives to traditional cooling methods. To achieve this aim, a series of experiments were performed, where dry machining, minimum quantity lubrication (MQL), nanofluids, cryogenic (cryo) cooling, and hybrid cooling (cryo+nano MQL) methods were tested. Under distinct nanofluids conditions hBN(0.2 %) + graphene(0.2 %) performed well and overall cryo+nano MQL produced better result in terms of tool wear, microhardness, surface and chip morphology. The results demonstrated that the cooling effect of the Cryo-MQL regime, which maintains the cutting temperature at a tolerable level and preserves the lubricant performance of the MQL, is the cause of the lowest Vb value of 90 & mu;m.
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    Identification of Constitutive Model Parameters for Nimonic 80A Superalloy
    (Springer India, 2018) Korkmaz, Mehmet Erdi; Verleysen, Patricia; Guenay, Mustafa
    Nimonic 80A is a nickel-chrome superalloy, commonly used due to its high resistance against creep, oxidation, and temperature corrosion. This paper presents the material constitutive models of Nimonic 80A superalloy. Johnson-Cook (JC) and modified JC model is preferred among the different material constitutive equations (Zerill Armstrong, Bodner Partom, Arrhenius type) due to its accuracy in the literature. Three different types of compression tests were applied to determine the equation parameters. Firstly, quasi-static tests were performed at room temperature. These tests were conducted at 10(-3), 10(-2), and 10(-1) s(-1) strain rates. Secondly, compression tests were performed at room temperature at high strain rates (370-954 s(-1)) using the Split-Hopkinson pressure bar. Finally, compression tests were performed at a temperature level from 24 to 200 degrees C at the reference strain rate (10(-3) s(-1)). Johnson-Cook and modified JC model parameters of Nimonic 80A were determined with the data obtained from these tests, and they were finally verified statistically.
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    In-process detection of cutting forces and cutting temperature signals in cryogenic assisted turning of titanium alloys: An analytical approach and experimental study
    (Academic Press Ltd- Elsevier Science Ltd, 2022) Gupta, Munish Kumar; Korkmaz, Mehmet Erdi; Sarikaya, Murat; Krolczyk, Grzegorz M.; Guenay, Mustafa
    In-process detection of cutting forces, temperature, roughness, wear etc. during machining of titanium alloys are very important. The Finite element (FE) analysis plays an important role in monitoring and detection of machining responses. It offers a high accuracy in modeling of dry cutting processes and its performance in modeling of cryogenic machining process is a matter of interest. In this context, current investigation focuses on the dry turning and LN2/CO2 cooling assisted turning process of commonly used Ti6Al4V alloy. It is very useful material in the biomedical sector, and the simulation of cutting forces and cutting temperature via finite element method (FEM) has been performed. In addition, the simulation results are validated with experimental work. The results show that the deviations between FE modeling and experimental results for the cutting temperature are the average of 5.54%, 5.18% and 8.42% for the dry, LN2 and CO2 cooling conditions, respectively. On the other hand, the deviations from FE modeling and cutting force test results were 3.74%, 3.358%, and 3.03% under dry, LN2 and CO2 cooling conditions, respectively.
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    A State of the Art on Sustainable Metal Working Fluids in Machining Applications
    (World Scientific Publ Co Pte Ltd, 2024) Yurtkuran, Hakan; Guenay, Mustafa; Rai, Ritu
    Metalworking fluids (MWFs) play a crucial role in machining processes by lubricating and cooling cutting tools, reducing friction, and improving overall machining efficiency. These fluids can be classified into various types, including cutting oils, water-based fluids, and semi-synthetic or synthetic fluids. Cutting oils are often mineral-based, providing excellent lubrication in heavy-duty applications. Water-based fluids, on the other hand, are more environmentally friendly and commonly used in light to moderate machining operations. Semi-synthetic and synthetic fluids offer a balance between performance and eco-friendliness, incorporating additives to enhance their properties. Proper selection and management of MWFs are essential for optimizing tool life, surface finish, and overall productivity in metal machining applications. Research has shown that the cost of cutting fluid in machining constitutes 17% of the total production cost. In the same research, it was stated that the cutting tool cost was around 4%. This review provides an overview of the current advancements in sustainable MWFs within machining applications. It explores state-of-the-art technologies, formulations, and practices aimed at minimizing environmental impact while maintaining optimal performance in metalworking processes. The review encompasses eco-friendly additives, recycling methods, and emerging trends in the development of MWFs, emphasizing the importance of sustainable practices in the manufacturing industry.