An intelligent and automated system for electrical discharge drilling of aerospace alloys: Inconel 718 and Ti-6Al-4V

Yilmaz, Oğuzhan; Bozdana, A. Tolga; Okka, M. Ali

doi:10.1007/s00170-014-6059-1

Cited by 43 publications

(37 citation statements)

References 10 publications

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“…The sigmoid function is differentiable for all values of the inputs to allow the use of powerful back-propagation learning algorithms [20]. The application of general sigmoidal membership functions to the neuro-fuzzy modelling process is a very attractive methodology to characterise nonlinear processes [21]. The advantage of sigmoidal membership functions over other membership functions is the better approximation due to tapering edges.…”

Section: Membership Functions For the Input And Output Variablesmentioning

confidence: 99%

Predictive Modelling and Analysis of Process Parameters on Material Removal Characteristics in Abrasive Belt Grinding Process

et al. 2017

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Abstract:The surface finishing and stock removal of complicated geometries is the principal objective for grinding with compliant abrasive tools. To understand and achieve optimum material removal in a tertiary finishing process such as Abrasive Belt Grinding, it is essential to look in more detail at the process parameters/variables that affect the stock removal rate. The process variables involved in a belt grinding process include the grit and abrasive type of grinding belt, belt speed, contact wheel hardness, serration, and grinding force. Changing these process variables will affect the performance of the process. The literature survey on belt grinding shows certain limited understanding of material removal on the process variables. Experimental trials were conducted based on the Taguchi Method to evaluate the influence of individual and interactive process variables. Analysis of variance (ANOVA) was employed to investigate the belt grinding characteristics on material removal. This research work describes a systematic approach to optimise process parameters to achieve the desired stock removal in a compliant Abrasive Belt Grinding process. Experimental study showed that the removed material from a surface due to the belt grinding process has a non-linear relationship with the process variables. In this paper, the Adaptive Neuro-Fuzzy Inference System (ANFIS) model is used to determine material removal. Compared with the experimental results, the model accurately predicts the stock removal. With further verification of the empirical model, a better understanding of the grinding parameters involved in material removal, particularly the influence of the individual process variables and their interaction, can be obtained.

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Section: Membership Functions For the Input And Output Variablesmentioning

confidence: 99%

Predictive Modelling and Analysis of Process Parameters on Material Removal Characteristics in Abrasive Belt Grinding Process

et al. 2017

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“…Diğer taraftan 1,5 A boşalım akımı ve 3 µs vurum süresiyle hassas ve düşük Ra değerine sahip yüzeyler elde edilebileceğine rağmen oldukça düşük İİH ve oldukça yüksek EAH değerleri elde edilmesi kaçınılmazdır. Bu hususlar ve literatürdeki benzer çalışmalardaki performans çıktıları [30,31] Yılmaz vd. çalışmasında [32], farklı hızlarda (200, 400 ve 600 rpm) dönen elektrotların işleme performansına çok büyük etkiler oluşturmadığı (elektrot hızında her 200 rpm'lik artış, İİH'de yaklaşık %16'lık artış sağlamakta) tespit edilmiştir.…”

Section: Deneysel Metot (Experimental Method)unclassified

Toz Katkili Ve Isitilmiş Di̇elektri̇ği̇n Elektro Erozyon İle İşlemede (Eei̇) Deli̇k Delme Performansi Üzeri̇ne Etki̇si̇

Erdem¹,

Çoğun²,

Urtekin³

et al. 2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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In this study, heated silicon oil with added carbon and starch powders was used as dielectric liquid, instead of common hydro-carbon based dielectrics, to obtain better hole surface quality with rotating brass tube electrode in electric discharge machining (EDM). The electro-rheometer tests were conducted to find out the suitable temperature and powder concentration values of the electro-rheological (ER) dielectric under the electric field. Higher workpiece material removal rates (MRR) was obtained in carbon powder added dielectrics than the starch powder added ones for rotating and non-rotating electrodes. The optical microscope observations of the machined hole surfaces indicated that the carbon powder added dielectrics reduced the diameter and depth of the discharge craters, thereby resulting in uniformly distributed and round top peaked surface topography. The starch powder addition to the carbon mixed dielectric further improved the surface quality for both rotating and non-rotating electrodes cases at 30˚C and 75˚C dielectric temperatures.

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“…Elektro erozyonla küçük deliklerin delinmesi ilk olarak Jeswani tarafından 0, 19- [14]. Çakır ve arkadaşları elektro erozyon ile delik delme işleminde, bulanık mantık kullanarak istenilen performans parametreleri için işlem parametrelerini tahmin eden bir model geliştirmişlerdir [15].…”

Section: Li̇teratür Taramasi (Literature Survey)unclassified

Soğutma Sıvısında Çözünen Oksijenin Elektro Erozyonla Delinen Deliklerin Performans Parametrelerine Etkisinin İncelenmesi

Göv¹

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu çalışmada, DIN 1,2379 kalıp çeliğine, tek delikli pirinç elektrotla, içerisinde farklı miktarlarda oksijen çözünmüş soğutma sıvısı kullanılarak elektro erozyon ile delik delme (EEDD) işlemi uygulanmıştır. Çalışmada elektro erozyon parametreleri sabit tutulmuş ve çözünmüş oksijenin EEDD performans parametreleri; işleme hızı, elektrot aşınması, yüzey pürüzlülüğü, beyaz katman tabakası, çap büyümesi ve çıkışta konikleşme üzerine etkileri incelenmiştir. Soğutma sıvısındaki çözünen oksijen miktarının artışı, elektro erozyon işleminin performansını arttırmıştır. İşleme zamanını % 20 iyileşme ile hızlanmış, yüzey pürüzlülük değeri R a 4,5 µm seviyelerinden 2,4 µm seviyelerine düşmüş, elektro erozyon ile işlemenin en olumsuz sonucu olarak bilinen beyaz katman tabakası kalınlığı yarıya düşürülmüş ve geometrik toleranslarda da önemli oranlarda iyileşmeler sağlanmıştır.Anahtar Kelimeler: Elektro erozyon ile delik delme, elektro erozyon işleme, oksijen çözünümü INVESTIGATION OF THE EFFECTS OF THE DISSOLVED OXYGEN IN THE COOLANT ON THE HOLE GEOMETRIES DRILLED BY ELECTRO EROSION ABSTRACTIn this study, electro discharge hole drilling processes is applied to the DIN 1.2379 tool steel by using single channel brass electrode and coolant which possess various amount of dissolved oxygen. In the study the electro erosion parameters kept constant and the effect of the dissolved oxygen on the performance parameters such as machining speed, electrode wear, surface roughness, white layer thickness, overcut in diameter and taper at the tip was examined. The increase of dissolved oxygen in the coolant improved performance parameters. Machining time is improved in 20%, surface roughness value R a is improved from 4.5 µm to 2.4 µm level, the unfavourable result of electro erosion machining, white layer thickness is decreased in half and some other improvement is obtained in dimensional tolerances.

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An intelligent and automated system for electrical discharge drilling of aerospace alloys: Inconel 718 and Ti-6Al-4V

Cited by 43 publications

References 10 publications

Predictive Modelling and Analysis of Process Parameters on Material Removal Characteristics in Abrasive Belt Grinding Process

Predictive Modelling and Analysis of Process Parameters on Material Removal Characteristics in Abrasive Belt Grinding Process

Toz Katkili Ve Isitilmiş Di̇elektri̇ği̇n Elektro Erozyon İle İşlemede (Eei̇) Deli̇k Delme Performansi Üzeri̇ne Etki̇si̇

Soğutma Sıvısında Çözünen Oksijenin Elektro Erozyonla Delinen Deliklerin Performans Parametrelerine Etkisinin İncelenmesi

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