Evaluation of Machinability in Terms of Cutting Force Components and Surface Roughness in Machining of Invar 36 Alloy with Ceramic Tools

Öz

Invar 36 is an alloy used in engineering applications where high dimensional stability is required in the field of space and aviation due to its low thermal expansion coefficient. In this study, the machinability of Invar 36 alloy has been evaluated in regard to the cutting force components (Fc, Ff and Fp) and surface roughness (Ra). The turning experiments were performed on dry conditions without using cooling liquid on a CNC lathe. The impact levels of the cutting parameters on the cutting force components and Ra are also determined with analysis of variance (Anova). The analysis results show that the feed rate has the highest significance on Fc, Ff, and Ra while the cutting depth has the highest significance on Fp. The minimum values for the cutting force components in the tests performed at a (Vc) of 240 m/min, at a (f) of 0.12 mm/rev and a (a) of 0.6 mm, have been measured as 95N, 80N, and 20N, respectively. The lowest Ra value was obtained as 0.452 µm as a result of the experiments performed at 180 m/min (Vc), 0.12 mm/rev (f) and 0.6 mm (a).

Anahtar Kelimeler

• Invar 36 Alloy
• Cutting Force
• Surface Roughness
• Variance Analysis

Invar 36 Alaşımının Seramik Takımlar ile İşlenmesinde Kesme Kuvveti Bileşenleri ve Yüzey Pürüzlülüğü Bakımından İşlenebilirliğinin Değerlendirilmesi

Öz

Invar 36, düşük ısıl genleşme katsayısı nedeniyle uzay ve havacılık alanında yüksek boyutsal stabilitenin gerekli olduğu mühendislik uygulamalarında kullanılan bir malzemedir. Bu çalışmada, kesme kuvveti bileşenleri (Fc, Ff, Fp) ve yüzey pürüzlülüğü (Ra) bakımından Invar 36 alaşımının işlenebilirliği değerlendirilmiştir. Tornalama deneyleri, kuru kesme şartlarında CNC torna tezgahında gerçekleştirilmiştir. Ayrıca, varyans analizi (Anova) ile kesme kuvveti bileşenleri ve Ra üzerinde kesme parametrelerinin etki düzeyleri belirlenmiştir. Analiz sonuçları, ilerleme miktarının Fc, Ff ve Ra üzerinde en etkili parametre olduğunu talaş derinliğinin ise Fpüzerinde en etkili kesme parametresi olduğunu göstermektedir. Kesme kuvveti bileşenleri (Fc, Ff veFp) için en düşük değerler 240 m/dak (Vc), 0,12 mm/dev (f) ve 0,6 mm (a) değerlerinde yapılan deneylerde sırasıyla 95 N, 80 N ve 20 N olarak ölçülmüştür. En düşük Ra değeri ise 180 m/dak (Vc), 0,12 mm/dev (f) ve 0,6 mm (a) değerlerinde yapılan deneyler sonucunda 0,452 µm olarak elde edilmiştir.

Anahtar Kelimeler

• Invar 36 Alaşımı
• Kesme Kuvveti
• Yüzey Pürüzlülüğü
• Varyans Analizi

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