Öpöz, Tahsin Tecelli

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https://hdl.handle.net/20.500.14411/8432
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Opoz, T. Tecelli
Ö.,Tahsin Tecelli
T.T.Öpöz
T.T.Opoz
O.,Tahsin Tecelli
T.,Öpöz
Öpöz,T.T.
Öpöz, Tahsin Tecelli
Opoz, Tahsin Tecelli
O., Tahsin Tecelli
Tahsin Tecelli, Öpöz
Tahsin Tecelli, Opoz
T., Opoz
Opoz,T.T.
Job Title
Araştırma Görevlisi
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Department of Mechatronics Engineering
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Former Staff
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SUSTAINABLE CITIES AND COMMUNITIES
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RESPONSIBLE CONSUMPTION AND PRODUCTION
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Scholarly Output

4

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WoS Citation Count

66

Scopus Citation Count

46

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WoS Citations per Publication

16.50

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International Conference on Advances in Materials and Processing Technologies -- NOV 02-05, 2008 -- Manama, BAHRAIN1
Journal of Micromechanics and Microengineering1
Materials and Manufacturing Processes1
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  • Thumbnail Image
    Master Thesis
    Mikro Elektriksel Aşındırma ile İşleme Kullanarak Mikro Deliklerin Üretimi
    (2008) Öpöz, Tahsin Tecelli; Erden, Abdulkadir
    Hızla gelişen teknoloji, ürün ve parçaların daha fazla işlevsel fonksiyonlar ile bütünleştirilmiş, boyutları küçültülmüş kompakt hacimlerdeki parçaların ve aksamların geliştirilmesini amaçlamaktadır. Bu hedef doğrultusunda mikro imalat yöntemlerinin geliştirilmesi gerekmektedir bundan dolayı mikro işleme üzerindeki endüstriyel araştırmalar oldukça önemli olmakta ve yaygınlaşmaktadır. Mikro elektriksel aşındırma ile mikro deliklerin üretimi mikro üretim teknolojisinin geliştirilmesine yönelik konulardan biridir. Bu konu bu çalışmada deneysel olarak geniş bir şekilde incelenmiştir.Mikro elektriksel aşındırma ile işlemede, işlenen parçanın geometrik şeklini yüzey kalitesini etkileyen, işleme karakteristiğini belirleyen, birçok elektriksel ve teknolojik parametre bulunmaktadır. Bu çalışmada, mikro elektrik aşındırma ile işlenen mikro deliklerin geometrik şekilleri farklı işleme parametreleri kullanılarak incelenmiştir. Kör ve boydan delik delinmesinde, deliklerin son uç şekillerinin oluşumu, delik çapında meydana gelen genişlemeler ve delik duvarlarının paralelliği araştırılmıştır. Sonuç olarak, delik içinde geometrik bozulmalara uzun sinyal süreleri (>500 ns) ile birlikte yüksek kazanım değerlerinin (<15) neden olduğu saptanmıştır. Ek olarak, boydan mikro deliklerin giriş ve çıkış çapları ölçülmüş ve ölçüm verileri değerlendirilmiştir. Bu değerlendirme sonucunda, daha düzgün duvar kenarları ve daha az pürüzlü yüzey elde etmek için, deliğin açılmasından sonra elektrotun fazla beslenmesi yada aşınmamış bir elektrot ile yeniden işleme tavsiye edilmiştir. Kör deliklerde 100 µm lik yada daha küçük çaplı elektrotlar kullanarak 20 boy/çap oranına erişilmiştir.Elektrotlarda ve deliklerde oluşan uç şekil gelişimi gözlemlenmiştir. İşleme süresi ve bu işleme süresine karşılık delik derinliği arasındaki ilişkisel bağ üzerinde çalışılmış ve işleme süresi arttıkça delik derinliğinde oransal azalma olduğu bulunmuştur. İşleme süresi ve deliğin radyal yönde genişlemesi arasındaki bir diğer ilişki de delik çapı için 20 µm lik bir bant içerisinde doğrusal olarak değiştiği bulunmuştur.Bu tezde mikro elektriksel aşındırma ile mikro deliklerin işlenmesinde, işleme parametrelerinin mikro delik geometrisi üzerindeki etkilerinin anlaşılmasına katkıda bulunulması amaçlanmıştır. Böylelikle, elde edilen bulgularla, üreticiler mikro deliğin şeklini, birçok uzun ve maliyetli deneyler yapmadan, tahmin edebilecektir.
  • Thumbnail Image
    Article
    Citation - WoS: 36
    Citation - Scopus: 42
    Geometry and Surface Damage in Micro Electrical Discharge Machining of Micro-Holes
    (Iop Publishing Ltd, 2009) Ekmekci, Buelent; Sayar, Atakan; Opoz, Tahsin Tecelli; Erden, Abdulkadir
    Geometry and subsurface damage of blind micro-holes produced by micro electrical discharge machining (micro-EDM) is investigated experimentally to explore the relational dependence with respect to pulse energy. For this purpose, micro-holes are machined with various pulse energies on plastic mold steel samples using a tungsten carbide tool electrode and a hydrocarbon-based dielectric liquid. Variations in the micro-hole geometry, micro-hole depth and over-cut in micro-hole diameter are measured. Then, unconventional etching agents are applied on the cross sections to examine micro structural alterations within the substrate. It is observed that the heat-damaged segment is composed of three distinctive layers, which have relatively high thicknesses and vary noticeably with respect to the drilling depth. Crack formation is identified on some sections of the micro-holes even by utilizing low pulse energies during machining. It is concluded that the cracking mechanism is different from cracks encountered on the surfaces when machining is performed by using the conventional EDM process. Moreover, an electrically conductive bridge between work material and debris particles is possible at the end tip during machining which leads to electric discharges between the piled segments of debris particles and the tool electrode during discharging.
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    Conference Object
    Citation - WoS: 2
    Citation - Scopus: 4
    CHARACTERISTICS OF SURFACE DAMAGE IN MICRO ELECTRIC DISCHARGE MAChinING OF MICRO HOLES
    (Trans Tech Publications Ltd, 2010) Ekmekci, Buelent; Sayar, Atakan; Opoz, T. Tecelli; Erden, Abdulkadir
    Micro Electric Discharge Machining is mostly used micromachining technique for manufacturing of micro holes and mini cavities. It is a thermal material removal process achieved by application of recursive electrical sparks between two conductive materials immersed in dielectric liquid. There are many electrical and technological parameters, which are effective in the machining characteristics and machined material surface integrity. In this study, effects of pulse energy on characteristics of surface damage in micro electric discharge machining of micro holes are investigated. To observe the influences of investigated pulse forms, a series of micro-holes were machined and cut from cross sections for metallurgical examinations. Unconventional etching agents were applied to examine the metallurgical transformations using optical and scanning electron microscopy. It was observed that heat-damaged segment is composed of three distinctive layers, have relatively high thicknesses (0.2 to 10 mu m) when compared with the size of the micro holes and varies noticeably with respect to drilling dept. Different morphological structures and deformations in the subsurface of micro-hole walls at several sections were illustrated. Finally, analyzed machining parameters and variation of hat damaged layer thicknesses were discussed in terms of drilling depth.
  • Thumbnail Image
    Article
    Citation - WoS: 28
    An Experimental Study on the Geometry of Microholes in Microelectric Discharge Machining
    (Taylor & Francis inc, 2009) Opoz, Tahsin Tecelli; Ekmekci, Buelent; Erden, Abdulkadir
    Shape and dimensional geometry of blind microholes produced by microelectric discharge machining (micro-EDM) is investigated experimentally to explore the relational dependency with respect to machining time. For this purpose, microholes are machined with machining times ranging from 1-80min on plastic mold steel samples using tungsten carbide tool electrode and hydro carbide dielectric liquid composed of mineral and synthetic oils. All other operational machining parameters such as pulse time, gap voltage, average current, and so forth, are kept constant during machining. Depth, diametric expansions, end-tip shape, wall side parallelisms of holes were analyzed both on surface and cross-sections of the samples. Consequently, nine different end-tip shape formations were observed, and these shapes discussed on basis of dielectric liquid circulation and sparking conditions during machining. Enlargement in hole diameter was predicted by defining a band-width of 20 mu m hole expansion. Moreover, parallel wall-side length was expressed as the microhole depth where 5% reduction in entrance diameter was measured at the tapered section.