Study of a Novel Ceramic Tool Performance in the Machining of Ti-6Al-7Nb Alloys
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.365
Study of a Novel Ceramic Tool Performance in the Machining of Ti-6Al-7Nb Alloys Ricardo del Risco-Alfonso1, Hector R. Siller2, Roberto Pérez-Rodríguez3 and Arturo Molina4 1
Assistant Professor. Center for the Study, Manufacturing and Re-manufacturing of Equipment and Parts, University of Camagüey, Cuba. [email protected]
2 Assistant Professor. Department of Engineering Technology. University of North Texas, USA. [email protected]
3 Professor. Director of the CAD/CAM Study Center. University of Holguin, Cuba. [email protected]
4 Vice-presidency of Research and Technological Transfer. Tecnológico de Monterrey, Mexico. [email protected]
ABSTRACT
Considering their distinctive properties, titanium alloys are used in foremost industries, including the aeronautic, automotive and biomedical industries. The reduced machinability of titanium alloys is due to their low thermal conductivity and high plasticity behavior. In the biomedical sector, one of the most studied alloys is Ti-6Al-4V. In the case of the Ti-6Al-7Nb alloy, scarce investigations are identified, related to machinability studies. The machining of Ti-6Al-7Nb alloy requires the development of new tools with higher properties, which provide better performance. The objective of this study is to present the experimental results related to a novel ceramic cutting tool, in terms of cutting tool life and productivity, in the machining of Ti-6Al-7Nb alloy. A turning operation of a 25 mm diameter bar was performed; the cutting speed was varied in three levels. The results showed the high performance of this type of tools, from the point of view of machinability. The values of the obtained cutting forces are found in the ranges reported by the consulted literature using ceramic tools. The surface roughness values were considered appropriate, taking into account that the tool is recommended for roughing and semi-finishing operations. The most relevant results were
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obtained in terms of productivity, considering that the performance is 2.53 times higher than the presented in similar works.
INTRODUCTION Titanium alloys are widely used in the aeronautical and biomedical industries due to their excellent mechanical properties. Among these properties we can remark the high mechanical resistance, the low density and the excellent resistance to corrosion at high temperatures [1]. From the biomechanical point of view and based upon welldefined biological mechanisms, the titanium alloys allow us to exploit their excellent properties, such as mechanical strength and bioinertness [2]. The Ti-6Al-4V alloy reports a large number of investigations related to subtractive manufacturing by chip removal. These investigations show the poor machinability of this t
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