Al6061 T256 alaşımının mikro-frezelenmesinde üst çapak oluşumun ve temizlenmesinin deneysel incelenmesi

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.

Anahtar Kelimeler:

mikro-frezeleme, çapak oluşumu, üst çapak yüksekliği, çapak temizleme, Al6061 T256 alaşımı

Experimental investigation on the top burr formation and its’ removal in micro-milling of Al6061 T256 alloy

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.

Keywords:

micro-milling, burr formation, top burr height, burr removal, Al6061 T256 alloy,

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