Derin çekme sınır oranın, flanş bölgesinin ısıtılarak artırılması için yöntem geliştirilmesi

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Date

2015

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Kaftanoğlu, Bilgin
Kayhan, Erdem

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Open Access Color

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Manufacturing Engineering
(2003)
Opened in 2003 with the aim to graduate experts in the field of machine-production, our Department is among the firsts in our country to offer education in English. The Manufacturing Engineering program focuses on the manufacturing technologies that shape materials from raw materials to final products by means of analytical, experimental and numerical modeling methods. First Manufacturing Engineering Program to be engineered by Müdek, our department aims to graduate creative and innovative Manufacturing Engineers that are knowledgeable in the current technology, and are able to use production resources in an effective and sustainable way that never disregards environmental facts. As the first Department to implement the Cooperative Education Program at Atılım University in coordination with institutions from the industry, the Manufacturing Engineering offers a practice-oriented approach in education with its laboratory infrastructure and research opportunities. The curriculum at our department is supported by current engineering software, and catered to creating engineers equipped to meet the needs of the production industry.
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Airframe and Powerplant Maintenance
(2012)
The Atılım University Department of Airframe and Powerplant Maintenance has been offering Civil Aviation education in English since 2012. In an effort to provide the best level of education, ATILIM UNIVERSITY demonstrated its merit as a role model in Civil Aviation Education last year by being granted a SHY 147 certificate with the status of “Approved Aircraft Maintenance Training Institution” by the General Directorate of Civil Aviation. The SHY 147 is a certificate for Approved Aircraft Maintenance Training Institutions. It is granted to institutions where training programs have undergone inspection, and the quality of the education offered has been approved by the General Directorate of Civil Aviation. With our Civil Aviation Training Center at Esenboğa Airport (our hangar), and the two Cessna-337 planes with double piston engines both of which are fully operational, as well our Beechcraft C90 Kingait plaine with double Turboprop engines, Atılım University is an institution to offer hands-on technical training in civil aviation, and one that strives to take the education it offers to the extremes in terms of technology. The Atılım university Graduate School Department of Airframe and Powerplant Maintenance is a fully-equipped civil aviation school to complement its theoretical education with hands-on training using planes of various kinds. Even before their graduation, most of our students are hired in Turkey’s most prestigious institutions in such a rapidly-developing sector. We are looking forward to welcoming you at this modern and contemporary institution for your education in civil aviation.

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Abstract

Bu tez çalışmasında geliştirilen yöntem kısaca, sac metal malzemelerin şekillendirilme oranının flanş bölgesinin eş sıcaklık dağılımsız ısıtılarak artırılması olarak açıklanabilir. Sıcaklık artışı malzemenin sünekliğinde belirgin bir yükselmeye ve buna bağlı olarak şekillendirilme kapasitesinin artmasına neden olur. Sıcaklık artışı ayrıca malzemenin akma sınırının düşmesi ile birlikte, uygulama kuvvetlerinde ve basınçlarında azalma meydana gelir. Otomotiv endüstrisinde en yaygın kullanıma sahip olan Yüksek Mukavemet Sac Çelik (AHSS) malzeme DP600 olup, araç ağırlıklarının azalmasını ve çarpışma emniyet faktörünün artmasını sağlamasından dolayı bu tez çalışmasında araştırma malzemesi olarak seçilmiştir. Adı geçen çelik malzemelerin kullanımı malzeme kalınlıklarının ve yakıt sarfiyatının azalmasını sağlar. Yapılan araştırmada geliştirilen yöntemin geçerliliği üç farklı tip malzeme, bunlardan iki tanesi Düşük Alaşımlı Yüksek Mukavemet çeliği (HSLA), diğeri ise IF (Arayersiz Çelikler) çeliği kullanılarak, incelenmiştir. Flanş bölgesinin sıcaklığının 180oC to 300oC değerleri arasında oluşturulduğu deneylerde derin çekme sınır oranında %25.58 kadar artış sağlanmıştır. Kullanılan sıcaklık ılık işlem sıcaklığı seviyesinde olduğundan, şekillendirilme kuvvetlerinde azalma meydana gelmesine rağmen malzemenin özelliklerinde ve dayanımında bir değişim gerçekleşmemektedir.
The method developed in the current thesis can shortly be described as the application of nonisothermal local heating in the flange region of the blank to improve the formability of sheet metals in deep drawing. The use of elevated temperature gives the possibility of significantly increasing the ductility of the material and the associated forming capability. It also drastically reduces the yield point and hence the forming forces and required pressures. One of the advanced high strength sheet steels (AHSS), DP600, widely used in the automotive industry due to enabling the reduction in car weigth and increasing the crash safety is chosen as a work material in this reasearch. Using AHSS steels also reduce the material thickness and lower fuel consumption. The three different types of steels, two HSLA and one IF steels, are additionally examined to observe the validity of the developed method. As a result of the experiments conducted within the temperature limits 180oC to 275oC in flange region, the Limiting Drawing Ratio in deep drawing (LDR) is increased up to 25.58 %. Since the temperature range stays in the warm region, material properties are not influenced; but the strength remains the same while the required forming forces are reduced.

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Makine Mühendisliği, Metalurji Mühendisliği, Mühendislik Bilimleri, Mechanical Engineering, Malzeme davranışı, Metallurgical Engineering, Engineering Sciences, Malzeme işleme, Material behavior, Material processing, Malzeme üretimi, Material production

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222