Titanyum ve alaşımlarının işlenebilirlik etüdü- Bölüm I

Titanyum esaslı ürünler yüksek maliyetleri ile tanınsalar da, düşük yoğunluk, mukavemet, kırılma direnci ve korozyon direnci özelliklerini bir arada bulundurabilmeleri sayesinde diğer malzemelerden ayrılırlar ve başta uçak ve uzay endüstrisinde olmak üzere, kimya endüstrisinde, tıpta, denizcilikte ve yiyecek endüstrisinde sıklıkla tercih edilirler. Tüm geleneksel talaş kaldırma yöntemlerinin uygulanabildiği bu malzemeler kendilerine has bazı özellikleri nedeniyle, işlenmesi-zor malzemeler grubuna girmektedir. Bu çalışmada titanyumun işlenebilirliği, kesici takım, kesme hızı, ilerleme hızı, kesme derinliği ve soğutucu / yağlayıcı maddeler ana başlıkları altında incelenecek, talaş oluşumu, aşınma mekanizmaları, yüzey pürüzlülüğü gibi konulara da yeri geldikçe değinilecektir. Ayrıca titanyumun işlenebilirliği üzerine yapılan bazı deneylerden ve sonuçlarından kısaca bahsedilecektir.

Although they are known to be expensive, titanium based products differ from other materials with their ability of having low density, strength, fracture toughness and corrosion resistance. They are preferred widely in the chemical, medical, marine and food industry. These materials, which all conventional machining techniques can be applied on, are in the group of difficult-to-cut materials, owing to some of their specific properties. In this study, machinability of titanium, and the effects of cutting tool, cutting speed, feed rate, depth of cut and coolant/lubricant onto the machinability was investigated. Besides, chip formation, wear mechanisms, surface roughness in various experiments about the machinability of titanium were also taken into consideration.

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1. Hua J., Shivpuri R., "Prediction of Chip Morphology and Segmentation During The Machining of Titanium Alloys", Journal of Materials Processing Technology, Basım Aşamasında (2004). 2. Ribeiro M.V., Moreira M.R.V., Ferreira J.R., "Optimization of Titanium Alloy (6Al-4V) machining", Journal of Materials Processing Technology, Cilt : 143-144, 2003, Sf : 458-463. 3. Sridhar B.R., Devananda G., Ramachandra K., Bhat R, "Effect of Machining Parameters and Heat Treatment on the Residual Stress Distribution in Titanium Alloy IMI-834", Journal of Materials Processing Technology, Cilt : 139, 2003, Sf : 628-634. 4. Xu J.H., Geng G.S., "Experimental Study on the Milling of a Ti Beta 21S", Journal of Materials Processing Technology, Cilt : 129, 2002, Sf :190-192. 5. Lei S., Liu W., "High-Speed Machining of Titanium Alloys Using The Driven Rotary Tool", International Journal of Machine Tools & Manufacture, Cilt : 42, 2002, Sf : 653-661. 6. Che-Cheron C.H., "Tool Life and Surface Integrity in Turning Titanium Alloy", Journal of Materials Processing Technology, Cilt : 118, 2001, Sf :231-237. 7. Hong Y.S., Ding Y., Jeong W.C, "Friction and Cutting Forces in Cryogenic Machining of Ti-6Al-4V", International Journal of Machine Tools & Manufacture, Cilt : 41, 2001, Sf : 2271-2285. 8. Nabhani F., "Machining of Aerospace Titanium Alloys", Robotics and Computer Integrated Manufacturing, Cilt : 17, 2001, Sf : 99-106. 9. Ohkubo C., Watanabe I., Ford J.P., Nakajima H., Hosoi T., Okabe T., "The Machinability of Cast Titanium and Ti- 6Al-4V", Biomaterials, Cilt : 21, 2000, Sf : 421-428. 10. Jawaid A., Che-Haron C.H., Abdullah A., "Tool Wear Characteristics in Turning of Titanium Alloy Ti-6246", Journal of Materials Processing Technology, Cilt : 92-93, 1999, Sf : 329-334. 11. Ezugwu E.O., Wang Z.M., "Titanium Alloys and Their Machinability-a Review", Journal of Materials Processing Technology, Cilt : 68, 1997, Sf : 262-274. 12. Kitagawa T., Kubo A., Maekawa K., "Temperature and Wear of Cutting Tools in High-Speed Machining of Incone1 718 and Ti-6A1-6V-2Sn", Wear, Cilt : 202, 1997, Sf : 142-148. 13. Schueller J.K., Tlusty J., Smith S., Leigh E., "Advanced Machining Techniques on Titanium Rotor Parts", American Helicopter Society, 56th Annual Forum, Virginia Beach, VA, 2-4-Mayıs-2000 14. Nabhani F., "Wear Mechanisms of Ultra-Hard Cutting Tools Materials", Journal of Materials Processing Technology, Cilt : 115, 2001, Sf : 402-412. 15. "Titanium Industries inc. - Data and reference guide", www.stormrobot.com/heavies/storm/design /titaniumbible. pdf 16. "Titanium alloys" www2.coromant.sandvik.com/coromant/ pdf/aerospace/gas_turbines/C_2920_18_ENG_043_074.pdf 17. "Machining titanium & its alloys" www.supraalloys.com/ machining_titanium.htm 18. "Details of titanium"www.kobelco.co.jp/titan/e/details.pdf 19. "Materials"http://claymore.engineer.gvsu.edu/~jackh/eod/ pdf/material.pdf