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AISI 304 ÇELİĞİNİ FARKLI GEOMETRİLERDE LAZERLE KESMEDE PARAMETRELERİN BOYUTSAL DOĞRULUK ÜZERİNE ETKİLERİNİN MODELLENMESİ

MODELING OF THE EFFECTS OF PARAMETERS ON DIMENSIONAL ACCURACY IN LASER CUTTING OF AISI 304 STEEL WITH DIFFERENT GEOMETRIES

Journal Name:

  • Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2014

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, some certain sizes of triangular, square and circular shaped parts have been cut through CO2 laser cutting centre over a 4 and 6 mm thickness of AISI 304 stainless steel material at different cutting conditions and the effects of cutting parameters were investigated on the dimensional accuracy of the samples. As the independent variables, laser power (W), cutting feed rate (F), focus point (ON) and gas pressure (P) have been selected. By using Full Factorial Experimental Design Technique (TFT), a total of 486 experiments have been carried out on the 4 and 6 mm thick sheet materials at three different levels of the independent parameters. Using the experimental data obtained as a result of the measurements made with three-dimensional coordinate measurement machine (CMM), the second-order predictive models, including the effects of laser cutting parameters on the dimensional accuracy of the triangular, square and circular-shaped samples have been improved through the Regression Analysis. Correlation coefficients of the predictive equations developed in the 95% confidence level have been obtained over R2=0,78. In this study, furthermore, the main effect graphics showing the effects of independent variables on the dimensional accuracy have also been formed and the effects of parameters were evaluated. The most effective parameters on the dimensional accuracy of the cut parts were laser power, cutting feed rate and focus point, respectively.
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Abstract (Original Language): 
Bu çalışmada, 4 ve 6 mm kalınlığındaki AISI 304 paslanmaz çelik malzeme üzerinden belirli ölçülerde üçgen, kare ve dairesel şekilli parçalar farklı kesme şartlarında CO2 lazer kesim tezgâhı ile kesilmiş ve kesilen numunelerin boyutsal doğruluğu üzerinde kesme parametrelerinin etkileri araştırılmıştır. Bağımsız değişkenler olarak lazer gücü (W), kesme ilerlemesi (F), odak noktası (ON) ve gaz basıncı (P) seçilmiştir. Tam Faktöriyel Deneysel Tasarım Tekniği (TFT) kullanılarak bağımsız parametrelerin üç farklı seviyesinde 4 ve 6 mm kalınlığındaki sac malzemeler üzerinde toplam 486 deney yapılmıştır. 3 boyutlu koordinat ölçme tezgâhı (CMM) ile yapılan ölçümler sonucu elde edilen deneysel veriler kullanılarak üçgen, kare ve dairesel şekilli numunelerin boyutsal doğruluğu üzerinde lazer kesme parametrelerinin etkilerini içeren ikinci dereceden tahminsel modeller Regresyon Analizi ile geliştirilmiştir. %95 güven seviyesinde geliştirilen tahminsel denklemlerin korelâsyon katsayıları R2=0,78’in üzerinde elde edilmiştir. Bu çalışmada ayrıca, bağımsız parametrelerin boyutsal doğruluk üzerinde etkilerini gösteren ana etki grafikleri oluşturulmuş ve parametrelerin etkileri değerlendirilmiştir. Kesilen parçaların boyutsal doğruluğu üzerinde en etkili parametreler sırasıyla lazer gücü, kesme ilerlemesi ve odak noktası olmuştur.
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