INVESTIGATION OF PROCESS PARAMETERS OF DIRECT METAL LASER SINTERING (DMLS) BENCH FOR RESEARCH AND DEVELOPMENT PURPOSE

Öz

In 1970s rapid prototyping systems, aimed at producing the samples of design. Since the beginning of 1980s people have started to talk manufacturing real part instead of sampling and they called the method of manufacturing as additive manufacturing. In 1990s with the development of additive manufacturing systems it has been started to manufacture direct end use functional part from metal and ceramic. Nowadays, with SLS machines by using various metal powders the part which has so complex geometry that cannot be manufactured by using conventional methods are able to be manufactured in many fields. DMLS bench which has first been manufactured in our country and which has been designed within the project supported by ministry of development was used in this study. Many experiments have been carried out aiming at determing bench process parameters by using 316L stainless steel powder. Single line scan, multi line scan and single layer scan were tried by changing the laser power between the range of 50W and 175W and scanning speed between the range of 5mm/s and 1000mm/s. Single line was achieved with a proper merging; the laser power was 100-175W and scanning speed was 85-100mm/s. Fusion was observed when the laser power was 100W, 125W and scanning speed was 100mm/s,200mm/s. More successful layer formation was observed when the laser power was 100W, scanning speed was 400mm/s and scanning distance 25µm

Anahtar Kelimeler

• Additive manufacturing,metal sintering bench,process parameters

AR-GE AMAÇLI DOĞRUDAN METAL LAZER SİNTERLEME (DMLS) TEZGÂHI İŞLEM PARAMETRELERİNİN ARAŞTIRILMASI

Öz

Eklemeli imalat teknolojileri 1970 yıllarında, tasarımların numunelerini hızlıca imal etmeyi amaçlayan hızlı prototipleme sistemleri ile başlanmıştır. 80’li yılların başından itibaren numune yerine gerçek parça imalata gündeme gelmeye başlamış ve imalat yönteminin adı Eklemeli İmalat olarak ifade edilmiştir. 90’lı yıllarda da eklemeli imalat sistemlerindeki gelişmelerle metal ve seramikten son kullanım amaçlı doğrudan fonksiyonel parçalar imal etme denemelerine başlanmıştır. Günümüzde de Seçmeli Lazer Sinterleme/Ergitme (SLS/E) makineleri ile birçok alanda çeşitli metal tozları kullanılarak klasik imalat yöntemleri ile imal edilemeyecek kadar karmaşık geometride olan parçaların göreceli olarak çok hızlı bir şekilde imalatı yapılabilmektedir. Bu çalışmada, Kalkınma bakanlığı destekli proje kapsamında tasarlanıp, ülkemizde ilk olarak imalatı yapılan, Doğrudan Metal Lazer Sinterleme tezgâhı kullanılmıştır. Tezgâh işlem parametrelerini belirleme amaçlı 316L paslanmaz çelik tozu kullanılarak; lazer gücü 50W-175W, tarama hızı 5mm/s-1000mm/s aralıklarında değiştirilerek tekli çizgi tarama, çoklu çizgi tarama ve tek katman tarama halinde deneyler yapılmıştır. Lazer gücünün 100-175W değerlerinde ve tarama hızının 85,100mm/s değerlerinde daha düzgün bir birleşme ile tekli çizgi elde edilmiştir. Lazer gücünün 100W, 125W değerleri ile tarama hızının 100mm/s,200mm/s değerlerinde kaynaşma görülmüştür. Lazer gücü 100W, tarama hızı 400mm/s ve tarama mesafesi 25µm değerlerinde iken daha başarılı katman oluşumu gözlemlenmiştir.

Anahtar Kelimeler

• Eklemeli imalat,işlem parametreleri,metal sinterleme tezgâhı

Kaynakça

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