Experimental Study on the Friction Drilling Process of AZ31B Magnesium Alloy

Abstract

In the present study, hole drilling was performed by using the friction drilling method on AZ31B Mg alloy at a constant speed and feed rate under minimum quantity lubrication (MQL) environment. In the experiments, the effects of MQL application times on axial force, temperature, surface roughness, bushing profile, and thread pull-out strength was investigated. The test results revealed that MQL applications reduced the temperature in the process region and caused an increase in axial force. During the friction drilling process, it was observed that the axial forces occurred in 7 different zones while the temperature consisted of 2 different zones.The increasing MQL application times were positively affected to hole surface quality and reduced the formation of the material adhesion on the hole wall. Three different bushing profiles were obtained as a parabola, linear, and binary linear depending on the generated heat exchange because of the MQL application times. The test results revealed that the hole surface quality has no effect on the thread pull-out strength, and the combination of the bushing profile and bushing length was decisive. The lowest thread pull-out strength was measured under dry drilling conditions, while the highest thread pull-out strength achieved by 10 seconds of MQL application. 

Keywords

• AZ31B
• friction drilling
• axial force
• temperature
• pull-out
• surface quality

AZ31B Magnezyum Alaşımının Sürtünmeli Delme İşlemi Üzerine Deneysel Çalışma

Abstract

Bu çalışmada sabit devir ve ilerleme hızında minimum miktarda yağlama (MQL) kullanılarak AZ31B Mg alaşımı üzerine sürtünmeli delme yöntemi ile delik delme işlemi yapılmıştır. Deneylerde MQL uygulama sürelerinin eksenel kuvvet, sıcaklık, yüzey pürüzlülüğü, kovan yapısı ve vida sıyırma dayanımı üzerindeki etkileri araştırılmıştır. Sürtünmeli delme işlemi esnasında eksenel kuvvet oluşumu 7 farklı bölgede, sıcaklık oluşumu 2 farklı bölgeden meydana geldiği görülmüştür. Artan MQL uygulama süreleri yüzey pürüzlülüğü üzerinde olumlu etkili yapmış ve pul duvarına malzeme yapışmasını azaltmıştır. Yapılan işlemlerde elde edilen bütün delik geometrileri kabul edilebilir niteliktedir. MQL uygulama süreleri işlem esnasında ortaya çıkan ısıyı değiştirdiğinden dolayı parabol, lineer ve ikili lineer olmak üzere üç farklı kovan profili elde edilmiştir. Delik yüzey kalitesinin vida sıyırma dayanımı üzerinde bir etkisinin olmadığı, kovan profilinin ve kovan uzunluğunun kombinasyonu belirleyici olduğu görülmüştür. En düşük vida sıyırma dayanımı kuru işleme şartları altında gerçekleşirken en yüksek vida sıyırma dayanımı 10 sn MQL uygulamasının yapıldığı deneylerde elde edilmiştir. 

Keywords

• AZ31B
• sürtünmeli delme
• eksenel kuvvet
• sıcaklık
• sıyırma dayanımı
• yüzey pürüzlülüğü

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