Yazar "Korkmaz, M. E." seçeneğine göre listele

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    Finite element modeling of tool stresses on ceramic tools in hard turning
    (Kaunas Univ Technol, 2017) Gunay, M.; Korkmaz, M. E.; Yasar, N.
    Hard turning process has been developed as a possible alternative instead of more expensive cylindrical grinding operations. This process involves many cutting conditions like traditional turning such as machining parameters, nose radius and tool geometry. This study aims that cutting force components (F-f, F-r, F-c) and cutting tool stresses depending on cutting conditions which are cutting speed, depth of cut and feed rate have been investigated in hard turning of DIN 1.2344 tool steel using uncoated ceramic tools. The experiments of hard turning were performed based on full factorial design. The distributions of cutting tools stresses were analyzed based on finite element method by using ANSYS software. ANOVA results showed that the most important factor on all cutting force components is the depth of cut while cutting speed has insignificant effect. In the results of study, it is shown that cutting tool image taken from ANSYS via finite element analysis and tool microscope are very similar. It is possible to say that the boundary conditions for loading of cutting force components are correct and the prediction of cutting tool stresses by finite element analysis can be determined in hard tuning processes.
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    Potential use of cryogenic cooling for improving the tribological and tool wear characteristics while machining aluminum alloys
    (Elsevier Sci Ltd, 2023) Gupta, M. K.; Nieslony, P.; Korkmaz, M. E.; Krolczyk, G. M.; Kuntoglu, M.; Pawlus, P.; Jamil, M.
    Understanding the process of tool wear in the initial and steady wear stages is crucial for ensuring the dimen-sional accuracy and surface quality of the workpiece, especially during the finishing step. In order to improve the tribological and tool life behaviors when machining the AA2024-T351 alloy, the current paper focuses on the potential use of cryogenic cooling conditions. Here, the experiments were performed under dry, minimal quantity lubrication (MQL), liquid nitrogen (LN2), carbon dioxide (CO2), conditions. The critical tool wear factors in terms of geometrical aspects and physical phenomena were investigated under sustainable cooling environments. The results prove that cryogenic cooling is helpful in improving tool life with good tribological characteristics.