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  • Küçük Resim
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    Analysis and optimization of cutting tool coating effects on surface roughness and cutting forces on turning of AA 6061 alloy
    (Hindawi Limited, 2021) Akgün, Mahir; Kara, Fuat
    The present work has been focused on cutting force (Fc) and analysis of machined surface in turning of AA 6061 alloy with uncoated and PVD-TiB2 coated cutting inserts. Turning tests have been conducted on a CNC turning under dry cutting conditions based on Taguchi L-18 (2(1) x 3(3)) array. Kistler 9257A type dynamometer and equipment have been used in measuring the main cutting force (Fc) in turning experiments. Analysis of variance (ANOVA) has been applied to define the effect levels of the turning parameters on Fc and Ra. Moreover, the mathematical models for Fc and Ra have been developed via linear and quadratic regression models. The results indicated that the best performance in terms of Fc and Ra was obtained at an uncoated insert, cutting speed of 350 m/min, feed rate of 0.1 mm/rev, and depth of cut of 1 mm. Moreover, the feed rate is the most influential parameter on Ra and Fc, with 64.28% and 54.9%, respectively. The developed mathematical models for cutting force (Fc) and surface roughness (Ra) present reliable results with coefficients of determination (R-2) of 96.04% and 92.15%, respectively.
  • Küçük Resim
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    Effect of PVD-TiN and CVD-Al2O3 coatings on cutting force, surface roughness, cutting power, and temperature in hard turning of AISI H13 steel
    (Springer, 2023) Akgün, Mahir; Özlü, Barış; Kara, Fuat
    The present work focusses on the hard turning of AISI H13 tool steel with PVD-TiN- and CVD-Al2O3-coated ceramic cutting tools. In this context, hard turning tests have been performed under dry cutting conditions at five different cutting speeds (120, 165, 210, 255, and 300 m/min), three different feeds (0.12, 0.18, and 0.24 mm/rev), and a constant depth of cut of 0.6 mm. The main cutting force (Fc), surface roughness (Ra), cutting power (Pc), and temperature (T), as well tool wear mechanisms, have been investigated under these subjected conditions. The outcomes of this study show that while feed plays an important role in the main cutting force and surface roughness, cutting speed also plays an important role in cutting power and temperature. The average main cutting force, surface roughness, cutting power, and temperature are 13, 15, 14, and 11% better when AISI H13 alloy is machined with the PVD-TiN-coated inserts than those in the CVD-Al2O3-coated inserts, respectively. SEM examination also revealed that the abrasion and adhesion mechanism is more effective when AISI H13 alloy is machined with the CVD-Al2O3-coated inserts compared to those in the PVD-TiN-coated inserts.
  • Küçük Resim
    Öğe
    Multi-Objective Optimization of Process Parameters in Milling of 17-4 PH Stainless Steel using Taguchi-based Gray Relational Analysis
    (Engineered Science Publisher, 2023) Kara, Fuat; Bulan, Nurettin; Akgün, Mahir; Köklü, Uğur
    The present study investigates the effects of cutting parameters and the variation of nose radius on cutting force, surface roughness, cutting temperature, and tool wear in the milling 17-4 PH stainless steel. The milling experiments were carried out using the Taguchi L18 experimental design with two different types of cutting nose radius (0.4 and 0.8), three different cutting speeds (70, 140 and 210 m/min), three different feed rates (0.06, 0.09 and 0.12 mm/tooth), and a constant cutting depth (1 mm). The outcomes of this study show that the cutting force, cutting temperature, and tool wear values are average 2.35, 28.89 and 1.18% lower when 17-4 PH stainless steel is machined with a 0.4 mm cutting nose radius compared to those in a 0.8 mm cutting nose radius. The surface quality is also improved by average 47.48% with an increase in the cutting tool nose radius. According to the multi response optimization results, the optimal levels of milling parameters for multiple output parameters are determined as 0.8 mm cutting nose radius, 70 m/min cutting speed and 0.06 mm/tooth, respectively.