Al 7075-T651 Alaşımının Tornalanmasında Elmas Benzeri Karbon (DLC) Kaplama Performansının İncelenmesi

Havacılık, biyomedikal ve otomotiv endüstrisinde alüminyum alaşımlarının kullanımının yaygınlaşmasıyla birlikte, bu malzemelerin işleme davranışları ve işleme problemleri son yıllarda ilgi konusu olmuştur. Kuru işlemede, alüminyum gibi yüksek plastisiteye sahip (sünek) metaller, takım-talaş ara yüzeyinde geniş temas alanı, yüksek sürtünme katsayısı ve sıvanma (adezyon) özellikleri ve buna bağlı olarak güçlü bir talaş yığılması (BUE) eğilimine sahiptir. Bu çalışmada alüminyum alaşımlarının bu problemine bir çözüm olarak son yıllarda yoğun çalışmaların yapıldığı DLC (diamond-like carbon) kaplamanın performansı Al 7075-T651 alaşımı için incelenmiştir. K10 standardına sahip sinterlenmiş karbür takım, üç farklı kaplama şartlarında (kaplamasız, ticari kaplamalı ve DLC kaplamalı) kullanılmıştır. Çalışmada DLC kaplama işlemi özgün olarak yapılmıştır. Bu takımların Al 7075-T651 alüminyum alaşımının işlenmesi sırasındaki performansı tornalama testleriyle gerçekleştirilmiştir. Tornalama işleminde talaş derinliği 1,5 mm sabit alınırken, 3 farklı kesme hızı (300, 400 ve 500 m/dk) ve 3 farklı ilerleme hızı (0,2-0,3 ve 0,4 mm/dev) seçilmiştir. Sonuç olarak, DLC kaplamanın sıvanma sorununa çözüm olabileceği, ancak kaplama parametrelerinin, kesici takım ve alaşımın sınıfına bağlı olarak optimize edilmesi gerektiği değerlendirilmiştir.

Investigation of Diamond-Like Carbon (DLC) Coating Performance in Turning of Al 7075-T651 Alloy

With the widespread use of aluminum alloys in the aerospace, biomedical and automotive industries, the machining behavior and machining problems of these materials have been of interest in recent years. In dry machining, metals with high plasticity (ductile) such as aluminum have a wide contact area at the tool-chip interface, high friction coefficient and smearing (adhesion) properties and a strong chip build-up (BUE) tendency. In this study, as a solution to this problem of aluminum alloys, the performance of DLC (diamond-like carbon) coating, which has been extensively studied in recent years, has been investigated for Al 7075-T651 alloy. Sintered carbide tool with K10 standard was used in three different coating conditions (uncoated, commercial coated and DLC coated). In the study, the DLC coating process was performed originally. The performance of these tools during the machining of Al 7075-T651 aluminum alloy has been performed by turning tests. While the depth of cut was fixed to 1.5 mm in the turning process, 3 different cutting speeds (300, 400, and 500 m / min) and 3 different feed rates (0.2-0.3 and 0.4 mm / d) were selected. As a result, it was evaluated that DLC coating could be a solution to the smearing problem, but coating parameters should be optimized depending on the grade of the cutting tool and the alloy.

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