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Browsing by Author "Çoğun, C."

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    Citation - Scopus: 2
    The Entropy Method Integrated Rsm Model To Evaluate Hole Geometries in Electrochemical Blind Hole Drilling
    (Taylor and Francis Ltd., 2025) Ayhan, E.; Yurdakul, M.; Çoğun, C.; iç, Y.T.
    The electrochemical drilling (ECD) process enables the machining of conductive materials with a wide range of hardness, yield strength, and brittleness. In this study, the ECD experiments have been conducted on blind hole drilling in high-speed steel material using a tailor-made ECD machine. The hole geometries (cross-sectional profiles) at different machining parameters have been examined for the hole depth consistency (HDC), hole cross-sectional area (HCAC) and the hole profile length (HPLC) evaluation (response; output) metrics introduced. The relationships between the hole geometry evaluation metrics and machining parameters are obtained using the response surface method (RSM). Using the Entropy method, an optimisation model is also proposed to combine multiple responses into a single objective function. The effectiveness of the Entropy method is compared with the Analytical Hierarchical Process (AHP). The comparison showed that the Entropy model provides more robust and convenient results than the AHP approach. © 2023 Engineers Australia.
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    Citation - Scopus: 6
    The comparison of performance of electrolytic cu and cube tool electrodes in electric discharge machining of ti6al4v alloy
    (TUBITAK, 2021) Urtekin, L.; Bozkurt, F.; Özerkan, H.B.; Çoğun, C.; Uslan, İ.; 3837; Mekatronik Mühendisliği
    The most crucial cost element of Electric Discharge Machining (EDM) is the production of tool electrode (shortly electrode). Copper, its alloys, and graphite are the most commonly used electrode materials. Selecting the proper electrode material with low production and material cost, high workpiece material removal rate (MRR) and low tool electrode wear rate (TWR) is key to reducing machining costs with EDM. In this study, the EDM performance of CuBe tool electrodes in the machining of Ti6Al4V alloy was experimentally investigated in comparison to electrolytic Cu (E-Cu) electrodes for different pulse time (ts) and discharge current (I) settings. An increase in MRR and a decrease in TWR and relative wear (RW=TWR/MRR) were observed in machining with CuBe electrodes. However, the high raw material cost of CuBe alloy is an essential drawback in widely using these electrodes in industrial applications. A new performance index formulation is introduced for EDM applications that factor in the production cost of the electrode and its life (i.e., RW). According to our results, the CuBe could be used advantageously as the electrode material at medium current settings. However, at low and high current settings, the low raw material cost of E-Cu makes it more favorable. © 2021, TUBITAK. All rights reserved.