Çağrı Vakkas Yıldırım

Çağrı Vakkas Yıldırım
Erciyes Üniversitesi · Department of Airframes and Powerplants

Doctor of Philosophy

About

31
Publications
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938
Citations
Additional affiliations
December 2017 - present
Erciyes Üniversitesi
Position
  • Professor (Associate)

Publications

Publications (31)
Article
Full-text available
The present paper addresses an ecological machining method in turning Hastelloy C 276 Nickel alloy under different conditions such as dry, oil with least quantity lubrication (LQL), and graphene-based nanofluid LQL (NFLQL) by changing the cutting speed (31, 46, and 62 m/min) and feed rate (0.1, 0.15 and 0.2 mm/rev). Four machining responses were st...
Article
Eklemeli imalat yöntemi, geleneksel imalat yöntemleriyle üretimi zor ya da mümkün olmayan, karmaşık geometriye sahip parçaların üretiminde önemli iyileştirmeler sunmaktadır. Ancak, çıktı kalitesinin istenilen seviyede olup olmadığı sorusu güncelliğini korumaktadır. Dolayısıyla, optimum üretim parametrelerinin elde edilmesi çıktı kalitesini artırmak...
Article
Full-text available
In this work, the drilling performance of carbon fibre reinforced plastic (CFRP) composites is analysed in terms of thrust force (Fn), torque (Mz), specific cutting energy (SEC), delamination factor (Fd), and hole quality under dry and cryogenic cooling conditions. An in-house developed multi-jet liquid nitrogen (LN2) delivery setup is used for exp...
Article
Full-text available
The current study examines the influence of various mono and proportional hybrid nanofluids prepared with multi-walled carbon nanotube (MWCNT), alumina (Al2O3) and molybdenum disulphide (MoS2) on the performance of cermet tools in turning of AISI 420 hardened steel. First, mono-nanofluids were prepared using each nanoparticle separately (i.e., Al2O...
Article
Today, superalloys (also known as hard-to-cut materials) such as nickel, titanium and cobalt based cover a wide range of areas in engineering applications. At the same time, challenging material properties namely high strength and low thermal conductivity cause low quality in terms of cutting tool life and surface integrity of the machined part. It...
Article
Aluminum (Al) alloys are of particular importance to the aerospace industry owing to the combination of characteristics including strength, ductility, toughness, fatigue life and oxidation resistance as a light metal. This is the case of AA 2024 T3 Al alloy. In particular, machining of these alloys has similar importance for productivity and part q...
Article
Cutting fluids significantly improve machining efficiency due to their high contribution to cooling and lubrication. However, the negative effects of traditional cutting fluids and worker health are valid reasons to seek alternatives. One of the alternatives is the minimum quantity lubrication (MQL) system. The MQL system, in which a small quantity...
Article
Owing to their superior features even under elevated temperatures, the nickel-based superalloy Inconel X750 is among the materials demanded in many critical areas. However, such alloys are hard to cut because of their characteristic properties i.e., strain hardening, poor thermal conductivity, high mechanical resistance at elevated temperature, the...
Article
Ceramics are widely used in machining of high temperature alloys i.e., Co-based Haynes 25 alloy due to its superior characteristics. The present paper is focused on the performance of whisker-reinforced ceramic cutting tool (WRCCT) under nano-sized solid lubricants dispersed in MQL (nanofluid-MQL) during turning of Co-based Haynes 25 alloy. The tur...
Article
This study examined the effects of dry, base fluid, mono and hybrid nanofluid cooling/lubrication conditions on machining performance in drilling of nickel based Hastelloy X superalloys. Nanofluids were prepared by adding 0.6 vol% graphene nanoplatelets (GNP) and/or hexagonal boron nitride (hBN) with or without addition of 0.25 wt% sodium dodecyl s...
Article
Full-text available
Since some deficiencies in mist lubri-cooling techniques i.e., minimum quantity lubrication (MQL) in heavy cutting conditions have been noticed, recently nano-cutting fluids which have enrich thermal conductivity than base fluid, are begun to be used in MQL system. One of the critical issues arising in this process is the addition of the appropriat...
Article
Due to their excellent chemical stability, hardness and abrasion resistance, ceramic cutting tools are suitable for operations at very high cutting speeds, which play a decisive role in high productivity. Thanks to these properties , they are significantly resistant to high temperatures occurred in the cutting zone. However, after a certain point,...
Preprint
The scopes of this journal covers different aspects of production systems and manufacturing science, which are listed below but not limited to: Adaptive manufacturing Additive manufacturing Agile manufacturing Artificial intelligence in manufacturing Automation of manufacturing Big data analytics in manufacturing Bio-inspired manufacturing CAD/CAM...
Article
Full-text available
Although nickel-based aerospace superalloys such as alloy 625 have superior properties including high-tensile and fatigue strength, corrosion resistance and good weldability, etc., its machinability is a difficult task which can be solved with alternative cooling/lubrication strategies. It is also important that these solution methods are sustainab...
Article
Inconel 625 is used extensively in critical parts of aircraft, especially gas turbine engines. However, the high strength, which is one of the reasons of choice, considerably reduces the workability of this material. In such a case, the most preferred method is the use of cutting fluid. On the other hand, the fact that conventional cutting fluids a...
Article
Superalloys are generally considered to be difficult to machinability. In recent attempts to facilitate their machinability, minimum quantity lubrication (MQL) has been used due to its positive influence on cutting tool life, the environment and human health. This study focused on the tool life, wear behavior and surface roughness in the milling of...
Article
Ceramic cutting tools are widely used particularly in high-speed machining of difficult-to-machine materials. However, using cutting fluid with these ceramic tools significantly reduces tool life. Therefore, the inclusion of a cooling/lubrication method into the process to improve the machining performance of ceramic tools will make machining effic...
Article
Full-text available
Minimum Miktarda Yağlama (MMY) sistemi, kullanılan kesme sıvısı miktarını önemli ölçüde azaltmaktadır. Böylece, konvansiyonel kesme sıvılarının getirdiği çevre, işçi sağlığı ve üretim maliyetlerinin artması gibi bazı dezavantajları ortadan kaldırmaktadır. Ancak, bu sistemde çok az miktarda kesme sıvısı kullanıldığı için soğutma kabiliyetinde azalma...
Article
Full-text available
Waspaloy gibi işlenebilirliği zor malzemelerin işleme verimliliğini artırmak için, kesme sıvısı kullanımı büyük önem taşımaktadır. Ancak, aşırı kesme sıvısı kullanımı çevre, çalışan sağlığı ve üretim maliyeti gibi konularda imalatçıları endişelendirmektedir. Bu endişeleri minimuma indirmek için kullanılan alternatif yöntemlerden birisi de Minimum M...
Article
Full-text available
Son yıllarda, nanoakışkanlar üzerine yapılan çalışmaların ortaya çıkmasıyla, nanoteknolojik soğutma terimi kullanılmaya başlanmıştır. Nanoakışkanlar, içeriğinde bulunan ve çok düşük oranlarda (< hacimce %1) eklenen nanopartiküllerin yüksek termal iletkenliklerinden dolayı, ısı transfer özelliklerini önemli oranda arttırmaktadırlar. Nanoakışkanlar,...
Article
Full-text available
In addition to reducing production costs, minimum quantity lubrication (MQL) aims to minimize the adverse effects of conventional cutting fluid usage on the environment and human health. Because of the positive effect of the MQL system on both health and production efficiency, sustainable production is increasing daily. Therefore, optimum MQL param...
Article
Full-text available
This study aimed to investigate the effect of the minimum quantity lubrication (MQL) parameters such as cutting oil type, flow rate, milling method, pulverization distance and nozzle type on average surface roughness (Ra) in milling of nickel based Waspaloy super alloy. During milling experiments, constant cutting speed (45 m/min), feed rate (0.1 m...
Conference Paper
Full-text available
Bu çalışmada, AISI 4340 marenzitik çeliğin kaplamalı karbür kesicilerle tornalanması esnasında kesme parametreleri ve Minimum Miktarda Yağlama (MMY) parametrelerinin yüzey pürüzlülüğü üzerindeki etkileri analiz edilmiştir. Tornalama deneyleri esnasında Alümina kaplamalı karbür uçlar kullanılarak, dört farklı kesme hızı (180, 240, 300 ve 360 m/dak),...
Article
zet Delik operasyonları, imalat sektöründe yoğun olarak uygulanan delik içi işleme operasyonlarına verilen genel bir isimdir. Delme operasyonu içerisinde; delik delme, kılavuz çekme, raybalama, broşlama, havşa açma vb. gibi işlemleri barındırmaktadır. Delme esnasında kesme işleminin, yarı kapalı bir alanda meydana gelmesi ve kesme bölgesine kesme s...
Article
zet Talaş kaldırma işlemlerinde, çevre ve insan sağlığını da göz önünde bulundurarak yüksek iş kalitesi ve düşük maliyetin nasıl elde edileceği sorusu sürekli çözüm aranan bir problemdir. Gelişen işleme teknolojisiyle birlikte kesme işlemlerinde, özellikle takım ömrünün arttırılması ve yüzey kalitesinin iyileştirilmesi için soğutma-yağlama işlemi ö...

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Project
Website: http://imperialopen.com/index.php/JPSMS Journal of Production Systems and Manufacturing Science (JPSMS) is a dedicated journal for reporting novel research outcomes for the industrial and manufacturing field. JPSMS publishes 2 issues per year. It has an elite editorial board with notable scholars from multi-country and multi-specialty of the manufacturing world. The review process is single-blind and it usually takes 2 to 6 months' time. The publication is free of charge. JPSMS is aimed to publish articles reporting novel concepts for manufacturing system improvement, complex problem solving with a direct link to industries, mechanics of manufacturing processes, design and development of new processes, machines, equipment and tools, phenomenological discovery using advanced characterizations and novels modeling and simulation with accurate experimental validations. ​JPSMS will most likely not consider articles on materials synthesis, characterization, and models without direct relation with manufacturing, simulation and modeling work without experimental validation​ and/or real system data.