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5 results on '"Burr formation"'

1. Toz metalurjisi yöntemiyle üretilen tungsten-bakır kompozit malzemelerin mikro frezelenmesi: Kompozisyon ve sinterleme sıcaklığının etkisi.

Author

Erçetin, Ali, Aslantaş, Kubilay, and Perçin, Mustafa

Abstract

Each passing day, materials are produced with different compositions by the method of powder metallurgy. The machinability of the produced materials is as important as the mechanical and chemical properties. In aforesaid article, cutting force variations, tool wear, surface roughness and burr formation during the micro milling of W-Cu alloys in different content sintered at 2 different temperatures were investigated. Significant amount of characterization study has been done and different measuring systems (like dynamometer, SEM, roughness measurement, surface profilometer) and software are used. The effect of the selected sintering temperatures on the microstructure are shown by SEM photographs, and then, effects of these temperatures on cutting force, tool wear, surface roughness and burr formation, which are caused by compositions with different Cu contents, are discussed. According to the obtained results, high sintering temperature and high tungsten ratio have been increased hardness values of samples. For this reason, tool wear in micro milling of W-%10wtCu sample sintered at 1100ºC is the maximum level. In addition, the sintering temperature and tungsten ratio significantly affect the cutting forces and surface roughness. As a result of abrasive wear mechanism, deterioration in tool geometry causes increasing of cutting forces, deterioration of surface quality and burr formation. [ABSTRACT FROM AUTHOR]

Published
2018
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2. Mikro işlemede takım aşınması - kanal geometrisi ilişkisi üzerine deneysel bir çalışma.

Author

Aslantaş, Kubilay, Çiçek, Adem, and Çelik, Safiye Gülbin

Abstract

In this study, the effect of tool wear on slot geometry was experimentally investigated in a micro-milling process. In the tests, Inconel 718 superalloy was selected as workpiece material and constant cutting parameters were considered. The tests were conducted under dry conditions and dimensional changes in micro-slots, burr formation and variations in cutting forces during/after consecutive cutting processes were investigated. According to the obtained results, peripheral wear formed on tool diameter increases with increasing cutting distance. An axial wear as well as the peripheral wear also forms on the cutting tool. Axial wear leads to variation of tool corner radius with the time. An increase in tool corner radius causes to deterioration of slot geometry and additional burr formation. In addition, the chips adhered to cutting tool also leads to an increase in tool corner radius. So, the cutting process turns into a ploughing dominant cutting process and the cutting forces increase. [ABSTRACT FROM AUTHOR]

Published
2018
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3. Al6061 T256 alaşımının mikro-frezelenmesinde üst çapak oluşumun ve temizlenmesinin deneysel incelenmesi

Author

SUCULARLI, Ferah

Subjects
Engineering, micro-milling, burr formation, top burr height, burr removal, Al6061 T256 alloy, Mühendislik, mikro-frezeleme, çapak oluşumu, üst çapak yüksekliği, çapak temizleme, Al6061 T256 alaşımı
Abstract

The burr formed in the micro-milling of metal parts adversely affects the function of the part and is very difficult or often impossible to remove. In this study, the variation of the average height of the top burr formed on the down-milling side (DMS) as a result of channel micro-milling of Al6061 T256 aluminum alloy under different machining conditions (for varying feed per tooth and milling (channel) depth settings) was experimentally investigated. Up-milling operations were performed at different radial depth (RD) values (10, 15 and 20 micrometer) so that the upper burr formed in the DMS under different machining conditions could be removed by micro-milling. It was found that the burr formed in the experiments was continuous, its height varied along the channel and it was Poison type. It was determined that the RD=15 micrometer value significantly removes the formed burr (reducing the burr height by 80-84%), and the use of the higher RD was not further effective in burr removal., Metal parçaların mikro-frezelemesinde oluşan çapak parçanın işlevini olumsuz etkilemekte olup temizlenmesi oldukça zor veya çoğu zaman imkansızdır. Bu çalışmada Al6061 T256 alüminyum alaşımının farklı işleme koşullarında (değişken diş başı ilerlemesi ve işleme (kanal) derinliği için) kanal mikro-frezelemesi sonucunda eş-yönlü frezeleme tarafı (EYFT) üstünde oluşan üst çapağının ortalama yüksekliğinin değişimi deneysel olarak işlenmiştir. Değişik işleme koşullarında EYFT’nda oluşan üst çapağının mikro-frezeleme ile temizlenebilmesi için değişik radyal derinlik (RD) kullanılarak (10, 15 ve 20 mikrometre) zıt-yönlü frezeleme yapılmıştır. Deneylerde oluşan çapağın sürekli yapıda olduğu, yüksekliğinin kanal boyunca değişim gösterdiği ve Poison tipi olduğu görülmüştür. RD=15 mikrometre değerinin oluşan çapağı önemli ölçüde (çapak yüksekliğini %80-84 mertebesinde) temizlediği, daha yüksek RD kullanımının çapak temizlemede fazla etkili olmadığı tespit edilmiştir.

Published
2022

4. Delik delme prosesi: bir araştırma.

Author

Bayraktar, Şenol, Siyambaş, Yusuf, and Turgut, Yakup

Abstract

Drilling has important role among all machining operations. In during drilling process such as excessive surface roughness, burr formation, ovality and axial deviation with adverse results have been encountered. These results have a significant influence in determining product quality and manufacturing costs. Hence, It is necessary to minimize these adverse results in order to work on each machine part precisely and to get an increased efficiency in production. Thrust force, torque, tool wear and surface roughness can be controlled by determining the optimum cutting parameters. Thereby, using these parameters increased efficiency and accuracy in production are provided. The investigated studies which are about drilling process on different materials are presented in this study. [ABSTRACT FROM AUTHOR]

Published
2017
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5. Kalıp parametrelerinin çapak oluşumuna etkisinin deneysel tasarım teknikleriyle incelenmesi

Author

Ensarioğlu, Kiymet, Özmutlu, H. Cenk, Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Endüstri Mühendisliği Anabilim Dalı., and Endüstri Mühendisliği Ana Bilim Dalı

Subjects
Burr formation, Deneysel tasarım, Endüstri ve Endüstri Mühendisliği, Çapak oluşumu, Kesme kalıbı, Cutting die, Industrial and Industrial Engineering, Design of experiments
Abstract

Kalıplarda kesme işlemi sonrasında oluşan çapağın, ürünün kalitesine etkisi büyüktür. Kesme kalıplarındaki kesme boşluğu, dişi burç ölçüsü, kesme açısı, makaslama farkı, sac kalınlığı ve sac kalitesinin çapak oluşumunu etkilediği öngörülmüştür. Bu çalışmada, çapak oluşumuna neden olan faktörlerin, çapak üzerindeki etkileri deneysel tasarım yöntemi ile incelenmiştir. Deneylerde, beş seviyeli kesme boşluğu, üç seviyeli dişi burç ölçüsü, üç seviyeli kesme açısı, üç seviyeli makaslama farkı, iki seviyeli sac kalınlığı ve iki seviyeli sac kalitesi kullanılmıştır. Sonuçlar, çeşitli seviyelere sahip faktörlerin oluşan çapak miktarı üzerinde değişim yarattığını göstermiştir. The burr that happens after the cutting process plays an important role in product quality. It is predicted that cutting gap, groove bush size, cutting angle, shearing difference, sheet thickness and sheet quality in cutting dies affects the burr formation. In this study, the design of experimental analysis was carried out to examine the factors and their effects on the burr formation. A five-level cutting gap, a three-level groove bush size, a three-level cutting angle, a three-level shearing difference, a two-level sheet thickness and a two-level sheet quality are used in the experiments. The results of the experiments show that the factors that have several levels, bring about change on the height of burr. 81

Published
2013

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