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Yayın Experimental analysis on drilling of Al/Ti/CFRP hybrid composites(Bellwether Publishing, 2021-01-25) Kayihan, Mete; Karagüzel, Umut; Bakkal, MustafaCarbon fiber reinforced composites (CFRP) have superior mechanical properties such as high strength/density ratio, and good damping ability. CFRP which is frequently used in parts in the aviation industry can also be single or stacked together with titanium and aluminum alloys. However, delamination could occur on the CFRP surfaces after drilling which leads to deterioration in mechanical properties. Therefore, in this paper, the effect of process parameters and stack order on cutting force, torque are investigated. The tests were carried out at three different drilling speeds and feed rates on a CNC vertical machine tool by using a solid carbide cutting tool. The results of hole quality indicate that the process outputs are significantly affected by process parameters and stack order. The force and torque values obtained at high drilling speeds and low feed rates are independent of the stack order. However, the stacking order is determined to be the most effective parameter for the thrust force and torque values. The force generated during the Ti/CFRP/Al stack in which the highest force value is approximately 50% higher than the lowest force which occurs on Al/Ti/CFRP stack. The surface roughness value measured during the Al/Ti/CFRP stack is approximately half of the other stack order.Yayın Experimental analysis and optimization of cutting strategies and parameters of thin-walled ABS thermoplastics(Taylor and Francis Ltd., 2026-04-15) Keklik, Burak Taha; Kayıhan, Mete; Kuzu, Ali Taner; Bakkal, MustafaThis study investigates the influence of tool path and milling parameters on the surface quality and dimensional accuracy of thin-walled structured thermoplastic polymer acrylonitrile butadiene styrene (ABS). Tests examined the effects of up-milling and down-milling on channels of two depths (10 and 20 mm) using three tool path strategies (zig-single direction, zigzag-double direction and follow periphery-peripheral cutting), five cutting speeds (25 to 125 m/min) and three feed rates (0.05, 0.1 and 0.2 mm/rev). The milling operation was carried out with an uncoated tungsten carbide end mill. Performance was evaluated through cutting forces (full and half immersion), surface roughness (base and side walls) and dimensional accuracy (channel width and 1 mm thin-wall deviations). A multi-objective optimization based on the chip removal rate (CRR), width deviation, wall deviations (left and right) and corresponding surface roughness values was conducted in order to determine the optimum cutting parameters. The results demonstrate that the Zig-Zag tool path combined with a cutting speed of 125 m/min yielded the optimal performance. Moreover, the optimization analysis revealed that the ideal feed rates for these conditions fall within the range of 0.05–0.09 mm/rev.
