Molibden ve Alaşımlarının Frezelenmesinde Takım Aşınmasının İncelenmesi

Year 2024, , 839 - 847, 25.07.2024

Hüseyin Gökçe , İbrahim Çiftçi

https://doi.org/10.2339/politeknik.1215548

Cited By: 1

Abstract

Verimliliğin öneminin arttığı günümüz dünyasında, üstün özelliklere sahip mühendislik malzemelerinin istenilen kalitede ve en uygun şartlarda şekillendirilebilmeleri büyük önem kazanmıştır. Refrakter metallerden olan molibden ve alaşımları, yüksek sıcaklık uygulamaları için uzay, havacılık, savunma ve biyomedikal gibi ileri teknolojilerin kullanıldığı sektörlerde bütünün en kritik parçalarının üretiminde yer bulan eşsiz malzemelerdendir. Refrakter metaller zor işlenen malzemeler olarak bilinir ve bu malzemelerin birim maliyetleri nispeten yüksektir. Malzemelerin bu özellikleri işleme verimliliğini olumsuz etkilemekte ve üretim maliyetlerini artırmaktadır. Bu çalışmada saf molibden, TZM (Titanyum-Zirkonyum-Molibden) ve MHC (Molibden-Hafniyum-Karbon) alaşımlarının frezelenmesi sürecinde kesici takımlarda meydana gelen aşınmalar ve takım ömrü incelenmiştir. Deneysel çalışmada kesici takım ve kesme parametrelerinin belirlenmesinde literatürde yer alan çalışmalar dikkate alınarak optimum kesici takım ve kesme parametreleri belirlenmiştir. Deneyler sonucunda aşınan kesici takımların dijital ve taramalı elektron mikroskopları (SEM) ile aşınma görüntüleri alınmış ayrıca EDX ile de aşınmış kesici takımlar incelenmiştir. Her üç malzeme gurubunda da kesici takımlarda hızlı aşınmalar gözlemlenmiştir. Saf molibdenin işlenmesinde yan yüzey aşınması görülürken, TZM ve MHC alaşımlarında krater aşınması dikkat çekici boyutlara ulaşmıştır. 4800 m3 talaş kaldırma miktarında yan yüzey aşınması saf molibdende 0,381 mm, TZM’de 0,072 mm, MHC’de 0,07 mm değerlerindeyken, krater aşınması TZM’de 5,85 mm2, MHC’de 8,348 mm2 değerlerine ulaşmıştır. Saf molibdende ise krater aşınması görülmemiştir. 

Keywords

Molibden ve alaşımları, frezeleme, takım aşınması, takım ömrü

Supporting Institution

Karabük Üniversitesi

Project Number

KBÜ-BAP-15/2-DR-002

Thanks

Bu çalışma, Karabük Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü tarafından KBÜ-BAP-15/2-DR-002 kodlu proje ile desteklenmiştir. Kuruma desteklerinden ötürü teşekkür ederim.

Investigation of Tool Wear When Milling Molybdenum and Its Alloys

Abstract

In our current world, where the importance of productivity increases, it is of great importance that the engineering materials with superior properties can be shaped in the desired quality and under the most favorable conditions. Molybdenum and its alloys, which are refractory metals, are among the unique materials found in the production of the most critical parts of the whole in high-tech applications such as space, aviation, defense and biomedical industries. Refractory metals are known as difficult-to-cut materials, and their unit costs are relatively high. These properties of materials adversely affect processing efficiency and increase production costs. In this study, wear and tool life of the cutting tools were examined during the milling operation of pure molybdenum, TZM (titanium-zirconium-molybdenum) and MHC (molybdenum-hafnium-carbon) alloys. In the experimental study, optimum cutting tools and cutting parameters were determined by considering the publications in literature. As a result of the experiments, wear images of the cutting tools were taken by digital and scanning optical microscopes (SEM). In addition, EDX analysis was also carried out on these cutting tools. In all three material groups, rapidly increasing wear was observed on the cutting tools. Flank wear was observed in machining of pure molybdenum while crater wear in was observed in machining of TZM and MHC alloys. At 4800 m3 metal removal rate, the flank wear was 0.381 mm for pure molybdenum, 0.072 mm for TZM, 0.07 mm for MHC, while crater wear reached 5.85 mm2 for TZM and 8.348 mm2 for MHC. No crater wear was observed in pure molybdenum.

Keywords

Molybdenum and its alloys, milling, tool wear, tool life

Project Number

KBÜ-BAP-15/2-DR-002

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