Farklı termofiziksel özelliklere sahip metallerin tel elektro erozyon ile işlenmesinde performans parametrelerinin optimizasyonu

Yıl 2019, Cilt: 21 Sayı: 1, 139 - 151, 15.03.2019

Hacı Bekir Özerkan

https://doi.org/10.25092/baunfbed.532597

Öz

CNC tel elektro erozyon (WEDM), iletken, gerilmiş küçük çaplı ince telin takım olarak kullanıldığı bir erozyon işlemidir (EDM). Makine elemanlarını, elektriksel kıvılcımlarla şekillendirmek için yaygın olarak kullanılmaktadır. WEDM ile kesmede, iş parçası malzemesi için uygun giriş parametrelerinin seçimi, malzemenin özellikleri dikkate alınarak yapılmalıdır. Ancak bu şekilde arzu edilen işparçası işleme hızı (İİH) ve yüzey pürüzlülüğü (Ra) parametreleri bu şekilde kontrol edilebilir. Bu çalışmada, WEDM'de elektriksel iletkenlik ve iş parçası malzemesinin diğer termofiziksel özelliklerinin rolü araştırılmıştır ve Grey analizi ile optimum işleme parametreleri tespit edilmiştir. Bu amaçla, alüminyum, bakır ve yüksek hız çeliği (HSS) çeşitli parametreler ile işlenmiştir. Sonuç olarak, en büyük MRR, bakırın kesilmesinde ve sırasıyla HSS ve alüminyum işlemlerinde elde edilmiştir. Ayrıca tespit edilen yüzey pürüzlülük değerleri ise en düşükten en yükseğe doğru sırasıyla bakır, HSS ve alüminyum metallerinin işlenmesi sonrasında ölçülmüştür.

Anahtar Kelimeler

Gri ilişkisel analiz, tel EEİ, ideal kesme değerleri

Optimization of machining performance parameters in wire EDM of metals with different thermophysical properties

Öz

CNC Wire electric discharge machining (WEDM) is different mode of electro discharge machining (EDM) in which conductive, stretched small diameter thin wire is used as tool. It has been widely used to shape machine elements by electrical sparks. In cutting with WEDM, suitable input parameters for the work piece material should be selected due to the its specifications. However the desired machining performace outputs like material removal rate (MRR) and surface roughness (Ra) parameters can be controlled in this way. In this study the role of thermophysical properties of work piece materials are researched in WEDM. And also, in this presented study an attempt has been made to Grey relational analysis to obtain desirable performance characteristics through the selection of appropriate process parameters. For this purpose, aluminum, copper and high speed steel (HSS) are machined with various parameters. As a result, the greatest MRR was obtained in the cutting of copper and in HSS and aluminum processes, respectively. And also if the detected surface roughness values are evaluated from lowest to highest copper, HSS and aluminum metals, respectively.

Anahtar Kelimeler

Grey relational analysis, wire EDM, optimum machining parameters

Kaynakça

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