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    Assessment of the machinability and energy consumption characteristics of Cu-6Gr hybrid composites under sustainable operating
    (Springer Heidelberg, 2024) Usca, uesame Ali; Sap, Serhat; Uzun, Mahir; Degirmenci, Uenal
    Hybrid composites are at the forefront of technological developments due to their high thermal conductivity and thermal stability requirements. Hybrid composites are complex to machining due to the hard reinforcement particles contained in them and may cause structural defects. For this reason, although they are at the forefront, they are not preferred much in the manufacturing industry. This study was carried out to increase the machining efficiency of hybrid composites and, at the same time, to encourage the use of these composites in industry by reducing the environmental impact. In this study, the effects of different cooling/lubrication conditions on the surface roughness, tool wear, cutting temperature, and energy consumption of Cu-6Gr/SiC-WC hybrid composites by CNC milling were investigated. For this purpose, six material types (1-2-3-4-5-6), three cutting speeds (150-200-250 m/min), three feed rates (0.15-0.20-0.25 mm/rev), and three cooling/lubrication environment (dry-MQL-cryo-LN2) was selected. It was determined that the best option in terms of surface quality is the MQL environment. Cryo-LN2 environment reduces tool wear, cutting temperature, and energy consumption by 67%, 31%, and 14%, respectively, compared to the dry environment. Additionally, the wear mechanisms occurring on the cutting tool were examined by SEM/EDS analysis. In general, the cryo-LN2 strategy can be used as the best option for sustainable milling of hybrid composites. The results obtained are promising for using Cu-6Gr composites in the manufacturing industry, and these results are seen as innovations for the machinability results of hybrid composites.
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    Machinability of different Cu-Gr composites in milling: Performance parameters prediction via machine learning models
    (Pergamon-Elsevier Science Ltd, 2025) Sap, Serhat; Acar, Erdi; Degirmenci, Uenal; Usca, uesame Ali; Memis, Samet; Sener, Ramazan
    The machinability of copper-graphite (Cu-Gr) composites has gained significant attention due to their unique thermal, electrical, and mechanical properties. This study experimentally investigates the machinability performances (such as surface roughness, flank wear, cutting temperature, and energy consumption) of Cu-Gr hybrid composite materials during milling. It predicts these parameters with machine learning models. The study aims to contribute to sustainable and optimized manufacturing processes by analyzing the effects of different cutting parameters and cooling/lubrication conditions on this performance. Furthermore, advanced artificial intelligence-based models predict machining outcomes, providing a robust framework for process enhancement and industrial implementation. Although there are comprehensive studies on the machining performances of metal matrix composites in the literature, there is limited information on Cu-Gr composites' mechanical and thermal behaviors in milling processes. To address this deficiency, a full factorial experimental plan was applied on six different Cu-Gr composites and the effects of different cutting speeds, feed rates and cooling/ lubrication environments (Dry, MQL, cryogenic LN2) on flank wear, surface roughness, cutting temperature and energy consumption were analyzed. The materials used in the study were prepared by mixing graphite and hard phases (Al2O3 and Cr3C2) in specific proportions, and these composites were compared in terms of machinability. Afterward, the output parameters of the experimental results are predicted by employing the well-known machine learning models and the experimental results. The results manifested that Gradient-Boosted Decision Tree Regression performs better than the other ten machine learning models in predicting machinability parameters. Finally, this study highlights potential areas for future research and provides a practical guide for optimizing CuGr composites in manufacturing processes and achieving sustainability goals. It has engineering value in efficiency, cost reduction, and developing environmentally friendly applications, especially for the automotive, aerospace, and energy sectors.