Browsing by Author "Altin, Abdullah"

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A Comparative Study on Conventional Natural Dyeing and Machine Dyeing Methods
(Stef92 Technology Ltd, 2012) Koyuncu, Menderes; Altin, Abdullah
Wool yarn has been dyed with natural colourant extracted from the different natural dyes in the absence and presence of Potassium aluminium sulphate, Copper sulphate and Acetic acid mordants for producing shades of different colours, and then tested for CIE Lab properties. L* value of the washed wool yarn was much higher than not washed wool yarn. Colouration of both the dyeing methods is found to be most effectively accomplished at treatment time. Dyeing on effect of treatment temperature, time and different mordants with Conventional and Machine dyeing methods have been discussed.
The Effect of Coating Material and Geometry of Cutting Tool and Cutting Speed on Machinability Properties of Inconel 718 Super Alloys
(Elsevier Sci Ltd, 2007) Nalbant, Muammer; Altin, Abdullah; Gokkaya, Hasan
In this study, the effects of cutting tool coating material and cutting speed on cutting forces and surface roughness are investigated. For this purpose, nickel based super alloy Inconel 718 is machined at dry cutting conditions with three different cemented carbide tools in CNC lathe. Metal removing process is carried out for five different cutting speeds (15, 30, 45, 60, 75 m/min.) while 2 mm depth of cut and 0.20 mm/rev feed rate are to be constant. Main cutting force, F. is considered to be cutting force as a criterion. In the experiments, depending on the tool coating material, lowest main cutting force is found to be 506 N at 75 m/min with multicoated cemented carbide insert whose top layer is coated by Al2O3. Lowest average surface roughness (0.806 mu m) is obtained at the cutting speed of 15 m/min with single coated (TiN) cemented carbide inserts. (c) 2006 Elsevier Ltd. All rights reserved.
The Effect of Cutting Speed and Cutting Tool Geometry on Machinability Properties of Nickel-Base Inconel 718 Super Alloys
(Elsevier Sci Ltd, 2007) Nalbant, Muammer; Altin, Abdullah; Gokkaya, Hasan
The effects of cutting speed and cutting tool geometry on cutting forces are investigated in this study. For this purpose, nickel-base super alloy, Inconel 718, is machined with dry cutting conditions by using digital controlled computer lathe with ceramic cutting tools in two different geometries and three different material qualities. Metal removing process is carried out for four different cutting speeds (150 m/min, 200 m/min, 250 m/min, and 300 m/min), while a cutting depth of 2 mm and a feed rate of 0.20 mm/rev are kept constant. As a result of the experiments, the lowest main cutting force, which depends on tool geometry, is obtained as 672 N with KYON 2100 SNGN 120712 ceramic tool and the maximum cutting force is determined as 1346 N with the ceramic cutting tool having KYON 4300 RNGN 120700 geometry. Depending on the cutting speed, the lowest main cutting force is recorded as 812 N at 250 m/min while the highest main cutting force is recorded as 955 N at 150 m/min. Plastic deformation, flank edge wear, notch and build-up edge are determined in high cutting speeds. (c) 2006 Elsevier Ltd. All rights reserved.
The Effect of Cutting Speed on The Machinability of 2080 Special K Steel on Vertical Machining Center
(Trans Tech Publications Ltd, 2014) Altin, Abdullah
This study presents the results of machining tests carried out determine the effect of cutting forces and surface roughness on machininig of 2080 Special K (1.2080 DINX210Cr12) cold work steel in terms of cutting speed, feed rate and depth of cut for milling process. A series of experiments have been performed on 2080 Special K steel material of cutting width 50 mm with round uncoated cemented carbide insert on 5,5 Kw engine power Jhonford VMC550 CNC vertical machining center without cutting fluid. Experiments were carried out by using four different cutting speeds (70,90,110,130 m/min) at constant depth of cut (1mm) and feed rate (0,3mm/rev.) and the effects of cutting speeds on primary cutting force and surface roughness were investigated. The study of the influence of workpiece material on milling process shows that hardening of material increased by machining up. Cutting force (Fc) and surface roughness decreases with improving workpiece material machinability. From the experiments, the lowest average primary cutting force was obtained as 604,03N at cutting speed of 90m/min. The lowest average surface roughness has been obtained as 0,19 urn at cutting speed 110m/min. Obtained chip form is narrow and short step.
The Effect of The Cutting Speed on The Cutting Forces and Surface Finish When Milling Chromium 210 Cr12 Steel Hardfacings With Uncoated Cutting Tools
(inst Za Kovinske Materiale I in Tehnologie, 2014) Altin, Abdullah
The experimental study presented in this paper aims to select the most suitable cutting and offset parameter combination for a milling process in order to obtain the desired surface roughness value for a machined workpiece of chromium 210 Cr12 steel, in terms of cutting speed, feed rate and depth of cut for the milling process. A series of experiments was performed on chromium material with a cutting width of 50 mm using a round, uncoated, cemented-carbide insert on a engine power 5.5 kW Jhonford VMC550 CNC vertical machining center without any cutting fluid. The experiments were carried out using four different cutting speeds ((70, 90, 110, 130) m/min) at a constant depth of cut (1 mm) and feed rate (0.3 mm/r) and the effects of the cutting speeds on the primary cutting force and the surface roughness were investigated. The cutting force (F-c) and the surface roughness (R-a) decreased with the workpiece material's easy machinability. From the experiments, the highest average primary cutting force was obtained as 658.17 N at a cutting speed of 70 m/min. The lowest average surface roughness was 0.36 mu m, which was obtained at a cutting speed of 70 m/min. The experimental results indicated that the obtained chip form is narrow and short stepped.
The Effects of a Tool's Chemical Composition on Its Performance When Turning Inconel 718 With Ceramic Inserts
(Assoc Mechanical Engineers Technicians Slovenia, 2007) Altin, Abdullah; Taskesen, Ahmet; Nalbant, Muammer; Seker, Ulvi
The effects of a cutting tool's chemical composition on wear and tool life are investigated. A series of experiments was carried out using silicon-nitrite-based (Si, Al, O, N) and whisker-reinforced ceramic tools (Al2O3+SiCw) that have two different geometries (square and circular) and three different ISO qualities. For the ceramic tools, a high level of aluminum and germanium caused built-up edge (BUE) formation, while notch wear is considered as a cause of high copper and oxygen levels in whisker-reinforced ceramic tools. Four different tools with two qualities showed the best performance at a cutting speed of 200 m/min. The fact that the whisker-reinforced square-type ceramic tools are subjected to plastic deformation is attributed to the high oxygen level in the cutting tool's structure. (C) 2007 Journal of Mechanical Engineering. All rights reserved.
Evaluation of the Cutting Forces, the Surface Roughness, and the Tool Wear Characteristics During Machining of Cobalt-Based Superalloy Haynes 188 With Ceramic Cutting Tool
(Sage Publications Ltd, 2022) Altin, Abdullah
In this research, we had studied the sensitivity for machining of cobalt-based superalloy Haynes 188 with ceramic cutting tool. The investigation had focused on the effects of the cutting speed, on the cutting forces, and on the surface roughness based on Taguchi's experimental design. The effects of machining parameters were determined using Taguchi's L27 orthogonal array. The signal-to-noise ratio was calculated for the average of surface roughness and the cutting forces, and the smaller were used to determine the optimal cutting conditions. The analysis of variance and the signal-to-noise ratio had effects on the parameters on both surface roughness and cutting. Three different types of cutting tools had been used in the experiment, namely KYON 4300, KYS 25, and KYS 30. The cutting force of Fz was considered to be the main cutting force. Depending on the material which had been used as cutting tool, the Fz had the lowest cutting speed and the lowest surface roughness with the KYS25 ceramic tool. The cutting force and the surface roughness of KYON 4300 cutting tool had shown better performance than other cutting tools. The flank wear and notch were found to be more effective in the experiments. The long chips were removed at low and medium cutting speeds, while the sawdust with one edge and narrow pitch at high cutting speeds was obtained.
Machining of Nickel Based Super Alloy Based on the Taguchi Method
(Tanger Ltd, 2015) Altin, Abdullah
In this paper, were determined the effects of cutting tool coating material and cutting speed on cutting forces and surface roughness based on Taguchi Experimental Design Method. Main cutting force, Fz is considered to be cutting force as a criterion. In the experiments, depending on the tool coating material, lowest main cutting force is found to be 548 N with KC9240 CVD coated cemented carbide and lowest average surface roughness (0.812 mu m) with KT313 uncoated cemented carbide insert both at 100 m/min. The effects of machining parameters were investigated using Taguchi L-18 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 while cutting speed and cutting tool has higher effect on the cutting force, the cutting tool and cutting speed has higher effect on average surface roughness. The results obtained, indicated that CVD cutting tools performed better than PVD and uncoated cutting tools according to cutting forces, but in terms of surface quality was observed poor performance with KC 9240 and KT315 by current parameters.
On the Tensile Behaviour of Bio-Sourced 3d-Printed Structures From a Microstructural Perspective
(Mdpi, 2020) Guessasma, Sofiane; Belhabib, Sofiane; Altin, Abdullah
The influence of the microstructural arrangement of 3D-printed polylactic acid (PLA) on its mechanical properties is studied using both numerical and experimental approaches. Thermal cycling during the laying down of PLA filament is investigated through infra-red measurements for different printing conditions. The microstructure induced by 3D printing is determined using X-ray micro-tomography. The mechanical properties are measured under tensile testing conditions. Finite element computation is considered to predict the mechanical performance of 3D-printed PLA by converting the acquired 3D images into structural meshes. The results confirm the leading role of the printing temperature on thermal cycling during the laying down process. In addition, the weak influence of the printing temperature on the stiffness of 3D-printed PLA is explained by the relatively small change in porosity content. However, the influence of the printing temperature on the ultimate properties is found to be substantial. This major influence is explained from finite element predictions as an effect of pore connectivity which is found to be the control factor for tensile strength.
Optimization of the Turning Parameters for the Cutting Forces in the Has Telloy X Superalloy Based on the Taguchi Method
(inst Za Kovinske Materiale I in Tehnologie, 2014) Altin, Abdullah
In this study the effects of the cutting-tool coating material and cutting speed on the cutting forces and surface roughness were determined using the Taguchi experimental design. For this purpose, the nickel-based superalloy Hastelloy X was machined under dry cutting conditions with three different cemented-carbide tools. The main cutting force, F-z, is considered to be the cutting force as a criterion. The mechanical loading and the abrasiveness of the carbide particles have an increasing effect on the cutting forces. According to the results of the analysis of variance (ANOVA), the effect of the cutting speeds was not important. Depending on the tool-coating material, the lowest main cutting force was found to be 538 N and the lowest average surface roughness, 0.755 mu m, both at 100 m/min with a multicoated cemented-carbide insert KC9240, whose top layer is coated by TiN. Moreover, the experimental results indicated that the CVD cutting tools performed better than the PVD and the uncoated cutting tools when turning the Hastelloy X in terms of the surface quality and the cutting forces with the current parameters.
Optimization of Turning Haynes 188 Cobalt Based Aerospace Material With Cemented Carbide Cutting Tool Based on Taguchi Experimental Design
(Tanger Ltd, 2017) Altin, Abdullah
In this paper were determined the effects of cutting speed, cutting tool and feed rate on cutting forces and surface roughness based on Taguchi experimental design. The effects of machining parameters were investigated using Taguchi L-18 orthogonal array. Three different cutting cemented carbide tools were used in experiments as K313, KCU10 and KCU25. Main cutting force Fz was considered to be cutting force as a criterion. The experimental design described herein was used to develop a main cutting force and surface roughness prediction model using analysis of Taguchi. Optimal cutting conditions were determined using the signal-to-noise (SN) ratio which was calculated for average surface roughness and cutting force according to the "the smaller is better" approach. Using results of analysis of variance (ANOVA) and SN ratio, effects of parameters on both average surface roughness and cutting forces were statistically investigated. In the experiments, depending on the tool material, lowest main cutting force 370 N at 75 m/min with KCU 25 and lowest average surface roughness (0.424 mu m) at 60 m/min with KCU 25 cemented carbide tool was found. It was found the effect of feed rate 0.198%) and cutting tool (0.06%) has higher effect on the cutting force and the feed rate (18.82%). The cutting speed (17.31%) has shown higher effect on average surface roughness. In the cutting force turning tests KCU25 and in the surface roughness turning tests, K313 cutting tool has shown better performance than the other cutting tools.
Optimization of Turning Machinig Parameters in Inconel 600 Super Alloy
(Gazi Univ, Fac Engineering Architecture, 2013) Altin, Abdullah
In this paper, the effects of cutting tool coating material and cutting speed on cutting forces and surface roughness were investigated on Taguchi experimantal design. Main cutting force, FZ is considered to be cutting force as a criterion. The effects of machining parameters were investigated using Taguchi L18 ortogonal 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 "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 has seen that while cutting tool and feed rate has higher effect on average surface roughness.