Browsing by Author "Kuntoğlu, Mustafa"

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Citation - WoS: 17
Citation - Scopus: 19
Evaluation of the Role of Dry and Mql Regimes on Machining and Sustainability Index of Strenx 900 Steel
(MDPI, 2022) Aslan, Abdullah; Salur, Emin; Kuntoğlu, Mustafa
Sustainable technologies draw attention in the machining industry thanks to their contributions in many aspects such as ecological, economic, and technological. Minimum quantity lubrication (MQL) is one of these techniques that enable to convey of the high pressurized cutting fluid toward the cutting zone as small oil particulates. This study examines the potency of MQL technology versus dry conditions on the machining quality during the milling of structural Strenx 900 steel within the sustainability index. High strength and toughness properties make this steel a hard-to-cut material providing an important opportunity to test the performances of dry and MQL environments. The outcomes of the experimental data demonstrated that MQL is superior in enhancing the quality of significant machining characteristics namely surface roughness (up to 35%), flank wear (up to 94%), wear mechanisms, cutting energy (up to 28%), and cutting temperatures (up to 14%). Furthermore, after analyzing the main headings of the sustainable indicators, MQL provided the same (+5) desirability value with a dry (+5) medium. This experimental work presents a comparative approach for improved machinability of industrially important materials by questioning the impact of sustainable methods.
Citation - WoS: 104
Citation - Scopus: 119
Experimental Study and Analysis of Machinability Characteristics of Metal Matrix Composites During Drilling
(ELSEVIER SCI LTD, 2019) Salur, Emin; Aslan, Abdullah; Kuntoğlu, Mustafa; Güneş, Aydın; Şahin, Ömer Sinan
In this study, the metal matrix composite materials were produced by hot press with various production parameters. The drilling experiments were performed on computer numerical control vertical machining centre without cutting fluid. Analysis of variance (ANOVA) was carried out in order to determine the effects of the production parameters on thrust force and surface roughness of metal matrix composites drilled with different feed rate. The effect of production parameters such as temperature, pressure and reinforcement ratio were investigated, and their effects were presented. The optimal level for each production parameters was determined by 'Maximize the S/N ratio approach with a Taguchi design'. The test results revealed that the reinforcement ratio was the main factor affecting the surface roughness of the metal matrix composites for both feed rate. However, same singularity was not matter on thrust force due to close contribution rates of production parameters and high error rates of analysis. In literature, an increase on the thrust force and the surface roughness values was reported as the feed rate increased during machining. Nevertheless, in our MMCs system, the thrust force and the surface roughness values were in tendency of declination / as the feed rate increased which makes this study more novel research.
Kompozit Malzemelerin Tornalanması Esnasında Oluşan Kesme Kuvvetlerinin Optimizasyonu
(2020) Salur, Emin; Aslan, Abdullah; Kuntoğlu, Mustafa; Güneş, Aydın; Şahin, Ömer Sinan
Kompozit malzemeler kullanılacağı yere göre tasarlanan ve üretilen malzemelerdir. Dolayısıyla kompozit malzemeler aynı üretim metodu kullanılarak kullanılacağı yere göre farklı üretim parametrelerinde üretilebilir. Farklı üretim parametrelerinde üretilen kompozit malzemeler farklı mekanik özelliklere sahip olacağı için bu durum kompozit malzemelerin işlenebilirlik özelliklerini etkiler. Bu sebeple kompozit malzemelerin işlenmesi esnasında oluşan kesme kuvvetlerinin tespit edilmesi ve optimizasyonu önem arz etmektedir. Bu kapsamda, 3 farklı üretim sıcaklığı (350, 400 ve 450?C) ve basıncı (480, 640 ve 820 MPa) ile 4 farklı karışım oranında (ağ. %10, ağ. %20, ağ. %30, ağ. %40) üretilen dökme demir (GGG-40) takviyeli ve bronz matrisli (CuSn10) kompozit malzemelerin kuru kesme şartlarında tornalanması esnasında kesme kuvvetlerinin optimizasyonu gerçekleştirilmiştir. Tam faktöriyel tasarım prensibi ile 36 deney yapılmış ve üç eksende kesme kuvvetleri ölçümü alınarak bileşke kesme kuvveti hesabı yapılmıştır. Deneyler esnasında kesme şartları sabit tutulmuştur (kesme hızı=50 m/dak, ilerleme=0,128 mm/dev ve talaş derinliği=1 mm). Varyans analizi (ANOVA) neticesinde bileşke kesme kuvveti üzerine en çok etkisi olan parametrenin %80 katkı oranıyla birlikte üretim basıncı olduğu tespit edilmiştir.
Citation - WoS: 18
Citation - Scopus: 20
Optimization Study on Surface Roughness and Tribological Behavior of Recycled Cast Iron Reinforced Bronze Mmcs Produced by Hot Pressing
(MDPI, 2021) Güneş, Aydın; Şahin, Ömer Sinan; Düzcükoğlu, Hayrettin; Salur, Emin; Aslan, Abdullah; Kuntoğlu, Mustafa; Pimenov, Danil Yurievich
Surface roughness reflects the quality of many operational parameters, namely service life, wear characteristics, working performance and tribological behavior of the produced part. Therefore, tribological performance is critical for the components used as tandem parts, especially for the MMCs (Metal Matrix Composites) which are a unique class of materials having extensive application areas such as aerospace, aeronautics, marine engineering and the defense industry. Current work covers the optimization study of production parameters for surface roughness and tribological indicators of newly produced cast iron reinforced bronze MMCs. In this context, two levels of temperature (400 and 450 degrees C), three levels of pressure (480, 640 and 820 MPa) and seven levels of reinforcement ratios (60/40, 70/30, 80/20, 90/10, 100/0 of GGG40/CuSn10, pure bronze-as received and pure cast iron-as received) are considered. According to the findings obtained by Taguchi's signal-to-noise ratios, the reinforcement ratio has a dominant effect on surface roughness parameters (Ra and Rz), the coefficient of friction and the weight loss in different levels. In addition, 100/0 reinforced GGG40/CuSn10 gives minimum surface roughness, pure cast iron provides the best weight loss and pure bronze offers the desired coefficient of friction. The results showed the importance of material ingredients on mechanical properties by comparing a wide range of samples from starting the production phase, which provides a perspective for manufacturers to meet the market supply as per human requirements.
Citation - WoS: 11
Citation - Scopus: 12
Towards Analysis and Optimization for Contact Zone Temperature Changes and Specific Wear Rate of Metal Matrix Composite Materials Produced From Recycled Waste
(MDPI, 2021) Güneş, Aydın; Salur, Emin; Aslan, Abdullah; Kuntoğlu, Mustafa; Giasin, Khaled; Pimenov, Danil Yurievich; Şahin, Ömer Sinan
Tribological properties are important to evaluate the in-service conditions of machine elements, especially those which work as tandem parts. Considering their wide range of application areas, metal matrix composites (MMCs) serve as one of the most significant materials equipped with desired mechanical properties such as strength, density, and lightness according to the place of use. Therefore, it is crucial to determine the wear performance of these materials to obtain a longer life and to overcome the possible structural problems which emerge during the production process. In this paper, extensive discussion and evaluation of the tribological performance of newly produced spheroidal graphite cast iron-reinforced (GGG-40) tin bronze (CuSn10) MMCs, including optimization, statistical, graphical, and microstructural analysis for contact zone temperature and specific wear rate, are presented. For this purpose, two levels of production temperature (400 and 450 degrees C), three levels of pressure (480, 640, and 820 MPa), and seven different samples reinforced by several ingredients (from 0 to 40 wt% GGG-40, pure CuSn10, and GGG-40) were investigated. According to the obtained statistical results, the reinforcement ratio is remarkably more effective on contact zone temperature and specific wear rate than temperature and pressure. A pure CuSn10 sample is the most suitable option for contact zone temperature, while pure GGG-40 seems the most suitable material for specific wear rates according to the optimization results. These results reveal the importance of reinforcement for better mechanical properties and tribological performance in measuring the capability of MMCs.