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Öğe Effect of vibration and cutting zone temperature on surface topography during hybrid cooling/lubrication assisted machining of Vanadis 10(Walter De Gruyter Gmbh, 2023) Ozbek, Onur; Ozbek, Nursel Altan; Kara, Fuat; Saruhan, HamitNew alloy materials developed to meet the increasing technological needs of people come into our lives with some difficulties in terms of machinability. New cooling and lubrication techniques have been developed to facilitate the workability of such difficult-to-process materials and protect the world ecologically and the quality of the produced product. The workpiece used in this study, Vanadis 10 SuperClean, is a high vanadium alloyed powder metallurgy tool steel offering a unique combination of excellent abrasive wear resistance in combination with a good chipping resistance. The present study investigated the effects of dry, cryo, and CryoMQL cutting conditions on cutting tool vibration amplitude, cutting temperature, surface roughness, tool wear, and tool life in turning of Vanadis 10 tool steel used in the automotive industry. The experiments were performed using TiCN/Al2O3/TiN coated cemented carbide tools and cutting parameters as the constant depth of cut (1 mm), feed rates (0.08, 0.1, 0.12 mm rev(-1)), and cutting speeds (80, 100, 120 m min(-1)). The results obtained from experiments showed that spraying liquid nitrogen into the cutting zone provided significant improvements on cutting temperature, tool wear, cutting tool vibration amplitude, and surface roughness. The best results in terms of all output were achieved in the CryoMQL cutting environment. CryoMQL environment has reduced surface roughness up to 65.03 %, flank wear 56.99 %, cutting temperature 32.77 %, and cutting tool vibration amplitude up to 42.76 % compared to dry machining.Öğe Effects of cryogenic treatment types on the performance of coated tungsten tools in the turning of AISI H11 steel(Elsevier, 2020) Ozbek, Nursel AltanThis study investigated the effects of the cryogenic treatment on cutting tool performance in the turning of AISI H11 steel. In the experiments, TiCN/Al2O3/TiN-coated tungsten carbide tools were used. Shallow cryogenic treatment was applied for 6 hat -80 degrees C (SCT6), deep cryogenic treatment at -196 degrees C for 6 h (DCT6), and deep cryogenic treatment at -196 degrees C for 24 h (DCT24). Turning tests were conducted at three cutting speeds (200, 240, and 280 m/min), three feed rates (0.15, 0.18 and 0.21 mm/rev), and a 0.6-mm depth of cut under dry cutting conditions. Experimental results showed that the cryogenic treatment increased the abrasion resistance of the cutting tool. The best cutting tool wear and surface roughness performance was obtained with the DCT24 tool. As a result of the tool life test, DCT24 tool wore 14.5% less than U tool. In terms of surface roughness, DCT24 tool improved up to 16.5% compared to the U tool. Moreover, it was determined that the cryogenic treatment provided an increase in the hardness of the cutting tools. The highest hardness increase also occurred in the DCT24 tool (10.87%). In addition, cryogenic treatment types were optimized for flank wear and surface roughness using the Taguchi method, and the effect levels of the cutting tools and cutting parameters were determined via analysis of variance. According to ANOVA results, for flank wear, the parameter having the most effect was the cutting speed, with an ratio of 56.811%, while for surface roughness it was the feed rate, with 95.827%. (C) 2020 The Author. Published by Elsevier B.V.Öğe Investigation Of The Effects Of Deep Cryogenic Treatment On The Microstructure, Hardness, Strength And Wear Resistance Of X17crni16-2 Martensitic Stainless Steel(World Scientific Publ Co Pte Ltd, 2023) Yildiz, Emre; Ozbek, Nursel AltanThis study investigates the effects of deep cryogenic treatment on the hardness, tensile strength, yield strength, and wear resistance of X17CrNi16-2 martensitic stainless steel. Steel samples were applied to deep cryogenic treatment at -180 degrees C for 12, 18 and 36 h after conventional heat treatment. After these processes, the steel samples were examined microstructurally, and martensite structure and carbides were observed. Mechanical properties increased after the cryogenic treatment was applied at all soaking times. It has been observed that the cryogenic treatment soaking time is directly proportional to the improvement in mechanical properties. The highest mechanical properties were obtained after the cryogenic treatment was applied for 36 h, which is the longest soaking time. Compared to the CHT sample, the DCT36 sample has a higher microhardness, tensile strength and yield strength of approximately 5.87%, 1.87% and 8.17%, respectively, and has 88% less wear rate.Öğe Optimization of flank wear and surface quality in the turning of 1.2343 tool steel using carbide tools coated via different methods(Iop Publishing Ltd, 2021) Ozbek, Nursel AltanThis study evaluated the effects of cutting tool coating type and process parameters on flank wear and surface roughness in the turning of hardened 1.2343 hot work tool steel. Two different coated tungsten carbide cutting tools (CVD TiCN/Al2O3/TiN and PVD TiAlN/TiN), three different cutting speeds and three different feedrates were used for the experimental tests. Turning tests were designed based on the Taguchi method (L18). Experimental results demonstrated that the PVD TiAlN/TiN tool performed better under all cutting conditions. Analysis of variance results determined the feedrate, with an impact ratio of 82.61%, to be the parameter with the most impact on surface roughness, while flank wear was most affected by the cutting tool, with 89.12%.Öğe Optimization of flank wear and surface roughness during turning of AISI 304 stainless steel using the Taguchi method(Carl Hanser Verlag, 2020) Ozbek, Nursel Altan; Karadag, Metin Ibrahim; Ozbek, OnurThis paper presents the effect of cutting tool, cutting speed and feed rate on the flank wear and surface roughness of austenitic stainless steel (AISI 304) during wet turning. Turning tests were designed based on the Taguchi method (L18). An orthogonal array, the signal-to-noise ratio (S/N) and the ANOVA were used to investigate the machinability of AISI 304 stainless steel with PVD and CVD coated tungsten carbide inserts. As a result of ANOVA, it was found that the feed rate was the most effective parameter on both flank wear and surface roughness.Öğe Statistical Analysis of the Effect of the Cutting Tool Coating Type on Sustainable Machining Parameters(Springer, 2021) Ozbek, Nursel Altan; Ozbek, Onur; Kara, FuatGood surface roughness and topography are of great importance in plastic mold materials. This study investigated the effects of cutting parameters on cutting temperature, vibration (g), surface roughness (Ra), and noise (N) in the turning of AISI P20 die steel using coated tungsten carbide cutting tools. Experiments were carried out using the Taguchi L-18 experimental design with cutting tools with two different types of coatings (CVD and PVD), three different cutting speeds (100, 150, and 200 m/min), three different feed rates (0.1, 0.15, and 0.2 mm/rev), and a constant cutting depth (1 mm). As a result of the study, the PVD-coated tools exhibited a higher performance for all outputs (cutting temperature, g, Ra, and N). It was observed that the vibration and surface roughness were proportional, vibration was mostly affected by feed rate, and increasing cutting speed and feed rate also increased the temperature and noise in the cutting zone. According to ANOVA results, the most effective parameter on surface roughness was feed rate (97.24%), the most effective parameter on vibration was cutting tool type (57.34%), and finally, the most effective parameter on noise was feed rate (50.37%).