Kubilay Aslantas

Kubilay Aslantas
Afyon Kocatepe University | AKU · Department of Mechanical Engineering

PhD

About

136
Publications
63,881
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1,881
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Introduction
Kubilay Aslantas is currently a professor of Department of Mechanical Engineering at Afyon Kocatepe University. He received his Ph.D. degrees in Mechanical Education from University of Gazi in 2003. His research interests include high speed machining, modelling of machining, micro machining, machinability evaluation and machining process monitoring.
Education
September 2005 - July 2006
University of Illinois, Urbana-Champaign
Field of study
  • shape memory alloy

Publications

Publications (136)
Article
Full-text available
In this study, predictive modelling was performed for the cutting forces generated during the orthogonal turning of AISI 316L stainless steel. An artificial neural network (ANN) and a multiple regression analysis were utilised. The input parameters of the ANN model were the cutting speed, feed rate and coating type. In the model, tungsten carbide c...
Article
Full-text available
In this study, the effects of different cutting conditions on the cutting performance were investigated in the micro milling of Inconel 718. In this context, dry cutting, minimum quantity lubrication and cryogenic pre-cooling were considered as the cutting conditions. Tool wear, surface roughness and burr formation were determined as performance cr...
Article
Full-text available
In this study, the effects of deep cryogenic treatment (DCT) on the wear resistance of AISI 52100 bearing steel were investigated. For this purpose, a number of bearing steel samples were held for different times (12, 24, 36, 48, 60 h) at deep cryogenic temperatures (-145 �C). The wear experiments were carried out in a ball–disk arrangement, by app...
Article
Full-text available
Surface roughness is an important parameter that determines the post-manufacturing product quality. In this study, effect of cutting parameters, coating material and the built-up edge phenomenon on the surface roughness were investigated in micro end milling process of Inconel 718 using a white light interferometer and scanning electron microscopy....
Article
In recent years, additive manufacturing (AM) of metallic parts opens new opportunities for many critical industrial sectors and individual necessities. The high quality and more functional components which are difficult or impossible to produce with the conventional methods can be readily manufactured using AM. In addition, minimization of design c...
Article
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The demand for additive manufacturing (AM) technology is recently increased in the aerospace, biomedical, and automobile sectors due to the capability of producing complex components with zero tolerance. However, the small or precise part manufactured by AM process needs post-processing such as machining, polishing, etc. because of the poor surface...
Article
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Objective: The aim of this in vitro study was to evaluate the effect of thermal aging and five different discolouring solutions on the shear bond strength (SBS), discoloration, and slot surface roughness (SSR) of Flash-Free ceramic brackets. Methods: A total of 70 human premolar teeth were randomly divided into seven groups: group 1: no procedure w...
Article
Full-text available
Microturning is a micromechanical machining process used to produce microcylindrical or axially symmetrical parts. Micro-cylindrical parts are mainly used in microfluidic systems, intravenous micromotors, microsurgical applications, optical lens applications, and microinjection systems. The workpiece diameter is very small in microturning and there...
Conference Paper
Full-text available
In this study, the effects of cutting parameters in micro milling of Ti6Al4V material on surface quality and burr formation were experimentally investigated. Besides, feed per tooth, cutting speed and depth of cut were handled in different parameters. Hence, the surface roughness of the channels subjected to the micro milling process was measured a...
Article
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In this study, the effect of zinc addition on the microstructure and mechanical properties of magnesium five-tin (Mg5Sn) alloys was investigated. The powder metallurgy (P/M) method was used for the production of Mg5Sn-xZn (x = 0, 1, 2, 3, 4, and 5 weight percent) alloy after magnesium powders were coated with paraffin. The paraffin coating method w...
Article
Introduction: This study aimed to compare ProGlider (Dentsply Sirona, Ballaigues, Switzerland) and R-Pilot (VDW, Munich, Germany) instruments in terms of their cyclic fatigue resistance using an artificial stainless-steel canal showing abrupt apical curvature, torsional resistance according to the ISO specification, and topographic changes on inst...
Article
Full-text available
In this study, the burr and slot widths formed after the micro-milling process of Inconel 718 alloy were investigated using a rapid and accurate image processing method. The measurements were obtained using a user-defined subroutine for image processing. To determine the accuracy of the developed imaging process technique, the automated measurement...
Article
Full-text available
ÖZET: Mikro tornalama işlemi, talaş kaldırma prensibi olarak geleneksel tornalama işleminin mikro seviyede boyutlandırılmış halidir. Talaş kaldırma mekanizmasındaki boyut etkisinden dolayı kesme kuvvetlerinin birbirleri arasındaki oran değişmekte, titreşim oluşmakta ve minimum talaş kalınlığına bağlı negatif talaş açısı gözlenmektedir. Bu boyut etk...
Preprint
Full-text available
In this study, the burr and slot widths formed after micro-milling process are investigated using a rapid and accurate image processing method. The measurements are obtained by processing the images and results were compared with a manual measurement method. In the cutting experiment stage, Inconel 718 alloy was chosen as the workpiece and cutting...
Article
Full-text available
Objective: The aim of this study was to investigate temperature and time variations during rootend resection. Material and methods: Sixty human premolars were selected. The root canals were enlarged up to ProTaper X3 rotary instrument. A thermocouple was placed into the root canal 1 mm behind the resection line. The teeth were randomly divided into...
Article
Full-text available
The aim of this study was to evaluate the roughness of the apical surface after apical resection performed by six different methods with an optical profilometer. Sixty human single root premolar teeth were used in this in vitro study. After root canal preparation, root canals were filled with gutta‐percha and AH Plus root canal sealers by lateral c...
Article
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In this study, the effects of various heat treatment procedures on the mechanical properties of the Ti-15V-3Al-3Sn-3Cr metastable β titanium alloy were investigated. Single-step and duplex aging treatments were applied to the alloy at low and high aging temperatures. Duplex aging treatments were carried out by selecting two different pre-aging time...
Article
Full-text available
In this study, the effect of tool geometry on the cutting forces, surface roughness, and burr formation in the micro-milling process is investigated. Three different geometric parameters (helix angle, number of cutting edges, and axial rake angle) that may affect the machining performance are taken into account. Inconel 718 superalloy was used as w...
Article
Full-text available
Metastable b titanium alloys are widely used in the biomedical, automotive, and aerospace industry, due to their excellent corrosion resistance, fatigue strength, biocompatibility, and easy formability. Besides all these use areas, the suitable microstructure of the alloys for heat treatment increases the efficient usability day by day. In literatu...
Article
Full-text available
Al2O3 coatings serve as a thermal barrier during a cutting operation and lead to a different chip formation due to changes in heat sharing and friction conditions, thus affect tool life substantially. In this study, the effects of Al2O3 coating on chip formation were investigated in orthogonal cutting of AISI 316L stainless steel. For this purpose,...
Article
Full-text available
In this study, Ti-15V-3Al-3Cr-3Sn metastable beta titanium alloy was subjected to with and without cryogenic treatment followed by single-step as well as duplex ageing treatment. The single-step ageing treatment was applied for 20 hours at 450°C and 10 hours at 550°C. The cryogenic treatment was carried out at -196°C for 24 hours, followed by singl...
Article
Full-text available
Micro-turning is a micro-mechanical cutting method used to produce small diameter cylindrical parts. Since the diameter of the part is usually small, it may be a little difficult to improve the surface quality by a second operation, such as grinding. Therefore, it is important to obtain a good surface finish in the micro turning process using the i...
Article
Full-text available
Micro-milling is a micro-mechanical cutting method used to obtain complex and three-dimensional micro geometries. Micro-cutting tools are used in the manufacturing of micro-components and the type of workpiece is also important for good surface quality and minimum burr. In this study, micro machinability of Ti6Al4V alloy which is used most frequent...
Article
Full-text available
In this study, micro machinability of Mg5Sn4Zn (TZ54) alloy produced by a hot-pressing process (one of the powder metallurgy methods) is investigated. For this purpose, micro-milling experiments were carried out, considering different cutting parameters. In order to determine the appropriate cutting parameters, the variation of cutting forces, surf...
Article
Full-text available
In this study, Mg Sn alloys were produced through the powder metallurgy (P/M) method by adding Sn in different ratios into Mg powder. A new mixing technique has been used in production to prevent the disadvantages of high reactivity that the Mg powders have. The prepared powder mixtures were turned into components by processing through hot pressing...
Article
Full-text available
In the present study, Mg5Sn–xZn (x = 0, 1, 2, 3, 4, and 5 wt%) alloys in superior biocorrosion properties were produced successfully. A novel mixing technique which prevents contact of magnesium with oxygen has been applied in order to produce Mg–Sn–Zn alloys by hot pressing. According to the obtained results, it was observed that a homogeneous mic...
Conference Paper
Full-text available
The scope of this study is the investigation of the effect of microstructure on fatigue behavior of Ti-15V-3Al-3Sn-3Cr (Ti 15–3) metastable beta titanium alloy. Aging treatment was applied to Ti 15–3 alloy at low and high aging temperatures. The fatigue crack initiation and propagation behavior of the alloy was determined by applying fatigue crack...
Article
Full-text available
Hybrid composites are the material group largely preferred for use in space, aerospace and ballistic applications, where superior mechanical strength and low density are required. Hybrid composites are produced using high strength Kevlar and S-glass fiber as reinforcement material. Three different nano-particle, nano-clay, nano-calcite and nano-car...
Conference Paper
Full-text available
Magnezyum (Mg) alaşımları, düşük yoğunlukları ve özgül dayanımları ile havacılık, uzay ve otomotiv endüstrisinde, elektronik/haberleşme, biyomalzeme ve spor ekipmanlarının imalatında kullanılmakta ve dökümden sonra özellikle medikal ve elektronik uygulamalarda mikro/makro işlemeye ihtiyaç duyulduğu, mikro işlenebilirliklerinin araştırmalara konu ol...
Conference Paper
Full-text available
Micro turning is a micro machining method used in the manufacture of micro cylindrical parts. Because of the depth of cut and the feed rate is very small, cutting operations can be made at the values close to the grain size of the workpiece. In this case, the cutting forces vary not only according to the type of workpiece, but also according to gra...
Conference Paper
Full-text available
In this study, tribological, corrosion, non-wettability and surface energy properties of were coated with TiO2 and ZrO2 by sol gel method. Ti6Al4V, W80-Cu20 processed in 15x5 mm dimensions were polished in 1 μm Al2O3 solution after required sanding operations before the left gel treatment. The wear tests were carried out in a ball-disc arrangement...
Article
Full-text available
In this study, the effect of notch orientation and a single overload on the fatigue crack propagation behavior of Ti–6Al–4V alloy was investigated. The notches were formed in two different forms: symmetrical and asymmetrical. Two types of fatigue crack propagation tests were applied to the specimens, with constant amplitude and overload. It was det...
Article
Full-text available
This study presents finite element simulations of cutting force, torque, and temperature in drilling of Inconel 718 superalloy. The FEM simulations were conducted at a cutting speed of 15 m/min and feed of 0.02 mm/rev using an uncoated solid carbide drill. The predicted cutting forces, torques and cutting temperatures were validated with the experi...
Conference Paper
Full-text available
Bu çalışmada, Inconel alaşımı sol-jel mettodu kullanılarak borlanmıştır. Borlama sonrası numuneler elektrik rezistanslı fırında 900○C'de 1 saat bekeltilerek sinterlemiştir. Numuneler kesitten kesilerek gerekli metolografik işlemlerden geçilirek numunelerin borür tabaka kalınlıkları Nikon MA100 marka optik mikroskop yardımıyla ölçülmüştür. Borlanmış...
Article
Full-text available
Each passing day, materials are produced with different compositions by the method of powder metallurgy. The machinability of the produced materials is as important as the mechanical and chemical properties. In aforesaid article, cutting force variations, tool wear, surface roughness and burr formation during the micro milling of W-Cu alloys in dif...
Article
Full-text available
Each passing day, materials are produced with different compositions by the method of powder metallurgy. The machinability of the produced materials is as important as the mechanical and chemical properties. In aforesaid article, cutting force variations, tool wear, surface roughness and burr formation during the micro milling of W-Cu alloys in dif...
Article
Full-text available
İmalat sanayinde gelişen teknoloji ve yüksek hassasiyette parça gereksinimi, mikro işlemeyi ortaya çıkarmıştır. Mikro mekanik işleme yöntemi ile hem yüksek hızda hem de yüksek hassasiyette iş parçaları üretmek mümkündür. Bir nümerik modelleme tekniği olan sonlu elemanlar metodu, deneysel olarak tespit etmenin zor olduğu verilerin (gerilme, şekil de...
Conference Paper
Full-text available
Mikro tornalama işlemi, geleneksel tornalama işlemine çok benzemekle beraber, takım geometri etkisinin daha ön plana çıktığı bir kesme işlemidir. Bu nedenle mikro tornalama işleminde kullanılan kesici geometrisinin ve kesme parametrelerinin özenle seçilmesi gerekmektedir. Bu çalışmada, Ti6Al4V alaşımının mikro şartlarda işlenmesi sırasında, takıma...
Article
Full-text available
In this study, a number of turning operations were performed in micro conditions at very high cutting speeds (up to 1400 m/min). At a wide range of depth of cut and feed values, the variations in cutting forces and surface quality were investigated. Also considering nose radius and edge radius of the cutting tool, the minimum depth of cut and feed...
Article
Full-text available
The wastes and emissions from machining processes have negative effects on the environment and human health. Therefore, the use of environmentally friendly cooling or lubrication systems has increased recently. Ethanol is an ideal coolant for high-speed machining because it has lower viscosity than those of oil-based coolants. Ethanol’s low evapora...
Article
Full-text available
Shape memory alloys (SMA) are widely used in the biomedical field due to their unique properties. Among these alloys, NiTi alloys are the most widely used. Machining process is one of the techniques to form these materials. If the NiTi alloys are mechanically forced to be cut, the crystal lattice structure can change and thus phase transformation c...
Article
Full-text available
Ti-5553 alloy is considered as a next generation aerospace alloy, however, it is also considered as difficult-to-machine material due to its thermal and mechanical properties. As limited research work presented in literature on machining process of this alloy, more research is needed to determine appropriate machining strategies for this alloy. Thu...
Article
In this study, the effects of the cutting parameters on the surface quality and burr width were investigated in the micro milling of Ti-6Al-4V alloy. Spindle speed, feed per tooth and depth of cut are selected as the control factors. Taguchi-based gray relational analysis was used in the optimization of the cutting parameters for minimal burr width...
Article
Full-text available
In this study, the effect of austempering treatment on the mechanical and fatigue strength of spheroidal graphite cast iron was investigated. For this purpose, material in pearlitic structure were heat treated at different austempering temperatures and times. In order to determine the effect of the austempering process on fatigue strength, fatigue...
Article
Full-text available
In this study, the effects of cryogenic treatment (CT) on the performance of CuCrZr alloy and Cu electrodes in electro discharge machining (EDM) of AISI P20 tool steel were investigated experimentally. For this purpose, a group of electrodes were cryogenically treated at-140 • C for 30 min and then tempered at 175 • C for 1 h. The tool performance...
Conference Paper
In this study, fatigue crack propagation behaviors of Ti-6Al-4V alloy were investigated for double sided notch condition. Axial fatigue tests were applied to the samples with a maximum force of 10 kN and sinusoidal waveform of 10 Hz frequency. Symmetrical and asymmetrical double edge notched plates are used as the test sample. A notch with three di...
Conference Paper
In this study, the effect of the overload condition on the fatigue crack propagation behavior of Ti-6Al-4V alloy was investigated. Double edge notched specimens were used for this. Furthermore, the effect of the angular position of the edge of the sample edge on the fatigue behavior was investigated. For this purpose, notches with three different d...
Article
Full-text available
Impact resistance and weight are important features for ballistic materials. Kevlar fibres are the most widely reinforcement for military and civil systems due to its excellent impact resistance and high strength-to-weight ratio. Kevlar fibres or spectra fiber composites are used for designing personal body armour to avoid perforation. In this stud...
Article
Full-text available
The objective of this study is to examine the effects of cryogenic and aging treatments on the impact strength and mechanical properties of Ti−6Al−4V alloy. To accomplish that objective, cryogenic treatment (CT), aging treatment (AT) and cryogenic treatment followed by aging treatment (CAT) were conducted on Ti−6Al−4V alloy. Impact tests were perfo...
Article
Full-text available
In this study, three-dimensional (3D) finite element analysis was carried out for micro milling of Ti-6Al-4V alloy. The Johnson–Cook material model equation was used, by considering the effects of strain, strain rate and temperature on material properties. The simulation for the milling process of Ti-6Al-4V was conducted through DEFORM based on the...
Article
Full-text available
In this study, the effects of increase of sintering temperature and Cu amount on microstructure, mechanical and electrical properties of WCu electrical contact materials fabricated via conventional powder metallurgy (P/M) method were investigated. The powders obtained by adding copper at different ratios into the tungsten powders were cold pressed...
Article
Full-text available
In this paper, a hybrid system was designed for cooling and lubrication in micro-milling of Ti6Al4 V alloy. This hybrid system is based on mixing the oil with chilled air. The effect of the hybrid system on cutting performance is evaluated in terms of tool wear and burr formation in the machining of Ti6Al4 V alloy. For cutting tests, an ultra-fine...
Article
Full-text available
In this study, the wears that occurred on the cutting tool edges as a result of being subjected to micro-milling process of W-30%wtCu composite material produced by sintering at 1000 0C were investigated. A series of micro-milling tests were carried out at a constant cutting depth to determine the effect of different feed rates on tool wear. End-mi...
Article
Full-text available
In this study, micro-milling of Inconel 718 was investigated. For this purpose, cutting tests were conducted by using uncoated tools and taking four different feed rates (1.25, 2.5, 3.75, and 5 µm/flute) and a constant cutting velocity (48 m/min) into account. In numerical modeling, thermomechanical behavior was modeled using the modified Johnson–C...
Article
This paper presents a series of experimental investigations of the effects of various machinin