Browsing by Author "Altin, A."

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A Comparative Study on Optimization of Machining Parameters by Turning Aerospace Materials According To Taguchi Method
(EDP Sciences, 2017) Altin, A.
The effects of cutting tool coating material and cutting speed on cutting forces and surface roughness were investigated by Taguchi experimental design. Main cutting force, Fz is considered as a criterion. The effects of machining parameters were investigated using Taguchi L18 orthogonal array. Optimal cutting conditions were determined using the signal-to-noise (S/N) ratio which is calculated for average surface roughness and cutting force according to the "the smaller is better" approach. Using results of analysis of variance (ANOVA) and signal-to-noise (S/N) ratio, effects of parameters on both average surface roughness and cutting forces were statistically investigated. It was observed that feed rate and cutting speed had higher effect on cutting force in Hastelloy X, while the feed rate and cutting tool had higher effect on cutting force in Inconel 625. According to average surface roughness the cutting tool and feed rate had higher effect in Hastelloy X and Inconel 625. © 2017 A. Altin et al.
Determination of Optimum Machining Parameters in Machining Rene 41 Superalloy Depending on Cutting Speed
(EDP Sciences, 2025) Altin, A.; Altin, M.C.; Altin, H.; Altin, T.
Rene 41 superalloy developed to withstand severe mechanical stresses and high temperature operation, and are widely used in aircraft and space vehicles, especially nickel-based ones, due to their high corrosion resistance. In this study, three different cutting forces and surface roughness qualities were evaluated depending on the cutting speed in the machining of Rene 41 superalloy with three different ceramic tools KYON 4300, KSY25 and KSY30. In this work, The experimental results have revealed that the feed rate had a serious effect on the cutting forces, while the effect of turning speed and type of the cutting tool on the cutting forces are relatively small. On the other hand, the most important factor influencing the surface roughness was cutting speed followed by tool type and feed rate, respectively. The presented findings can help for understanding the machinability and surface characteristics of Rene’41 during high speed turning. In the experiments, it was observed that the cutting forces decreased as the cutting speed increased. © The Authors, published by EDP Sciences.
The Effect of Cutting Speed in Machine Parameters on the Machinability of Inconel 718 Superalloys
(2006) Altin, A.; Gökkaya, K.; Nalbant, M.
In this study, Inconel 718; nickel based super alloy, was machined with round uncoated cemented carbide insert on (CNC) JOHNFORD T35 lathe without cutting fluid. Metal cutting processes were carried out by using five different cutting speeds (15, 30, 45, 60, 75 m/min) at constant depth of cut (2 mm) and feed rate (0.20 mm/rev) and the effects of cutting speeds on primary cutting force and surface roughness were discussed. From the experiments, the lowest average primary cutting force was obtained as 629 N at cutting speed of 75 m/min and the highest primary cutting force was obtained as 1150 N at 15 m/min cutting force depending on cutting speed. The lowest average surface roughness has been obtained as cutting speed of 0.45 urn at 45 m/min, and the highest average surface roughness was obtained as 0.88 μm at 75 m/min. Obtained chip form is consecutively narrow and wide stepped.
The Effects of Cutting Speed on Tool Wear and Tool Life When Machining Inconel 718 With Ceramic Tools
(Elsevier Sci Ltd, 2007) Altin, A.; Nalbant, M.; Taskesen, A.
In this study, the effects of cutting speed on tool wear and tool life when machining Inconel 718 nickel-based super alloy have been experimentally investigated. A series of tool life experiments has been carried out using silicon nitrite based and whisker reinforced ceramic tools which have two different geometries and three different ISO qualities with 10% water additive cutting fluid. The experiment results show that crater and flank wears are usually dominant wear types in ceramic square type (SNGN) inserts while flank and notch wear are dominant in round type (RNGN) inserts. Minimum flank wear is seen with SNGN tools at low cutting speeds while it is seen with RNGN tools at high cutting speeds. (c) 2006 Elsevier Ltd. All rights reserved.
The Effects of Cutting Speed on Tool Wear and Tool Life When Turning Inconel 718 With Ceramic and Coated Carbide Inserts
(Springer india, 2007) Taskesen, A.; Altin, A.; Nalbant, M.
The effects of cutting speed on tool wear and tool life when machining Inconel 718 with ceramics and carbide inserts are experimentally investigated at different cutting conditions. In machining tests various ceramics, coated and uncoated carbide cutting tools having different geometries are used under various cutting speeds. The results show that square type ceramic inserts are subjected to crater and flank wear while round type ceramics are subjected to flank wear and depth of cut notch wear. At lower speeds (150 m/min) whisker reinforced square type ceramic inserts are found to be best tools for cutting Inconel 718 while round type inserts are found to be best tool at higher cutting speeds. Generally, flank wear, plastic deformation and notch wear are effective for coated carbides while flank wear and notch wear are seen with uncoated inserts. In addition, the wear performance of uncoated carbide tools is found to be higher than that of coated carbide tools at certain speeds.
A Precision Analysis of Machining Incoloy 901 Aerospace Materials With Cemented Carpide Tools by the Taguchi Method
(Trans Tech Publications Ltd, 2023) Altin, A.
. In this research work, was made a study on the effects of turning conditions on incoloy 901 nickel-based superalloy and performed a precision analyzes using the Taguchi L27 orthogonal array. Using the results of variance analysis (ANOVA) and signal-to-noise (S / N) ratio and taking into account the "smaller is better" approach were statistically investigated to establish a correlation amongst the speed of cutting, feed rate and cutting tool with respect to surface quality and cutting forces. KCU10, K313 and KCU25 cemented carpide cutting tool were used in experimental study. The experimental results have revealed the most important factor influencing the cutting force and surface quality was the type of the cutting tool and it’s had a serious effect on both, KCU10 and followed by KCU25 was found better than the other cutting tool. Optimum parameters for the cutting forces were found 0,150 mm/rev., 90 m/min. with KCU10 cutting tool The found findings can help for revealed the optimization of machining parameters and surface characteristics of Incoloy 901 during high speed turning. © 2023 Trans Tech Publications Ltd, Switzerland.