Surface integrity and tool life when turning of Ti-6Al-4V with coolant applied by different methods
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The main focus of this study is to investigate the behaviour of cemented carbide tools and the surface integrity obtained when turning Ti-6Al-4V alloy. Machining trials were carried out with emulsion cutting fluid applied under conventional and high-pressure supplies and also in an argon-enriched environment. Tool life, cutting force, surface roughness, micrograph and microhardness beneath machined surface were evaluated for better understanding the relationship between the fluid environment and the surface integrity of the machined workpiece. Machining with high-pressure coolant supply generated the best tool life results, while enriched argon showed lower tool life because of the lower conductivity and poor lubrication characteristics of argon gas that lead to heat to be more concentrated at the cutting area, thus weakening the strength of the cutting tool and accelerating tool wear. No plastic deformation was observed on the machined surfaces under the conditions investigated. However, there was evidence of surface hardening after machining with conventional and in an argon-enriched environment due to the poor cooling function of argon. Surface hardening was minimal after machining with high-pressure coolant supplies.
KeywordsSurface integrity Ti-6Al-4V High-pressure coolant Argon-enriched environment
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- 1.Trent EM, Wright PK (2000) Metal cutting, 3th edn. EUA, Butterworth Heinemann, Boston, 446pGoogle Scholar
- 4.Abrão, A.M., Wise, M. and Aspinwall, D., 1998, Tool life and workpiece surface integrity evaluations when machining hardened AISI H13 and AISI E52100 steels with conventional ceramic and PCBN tool materials, SME Technical Paper, N0. MR95–159.Google Scholar
- 5.Abrão, A.M., 1995, The machining of annealed and hardened steels using advanced ceramic cutting tools. PhD Thesis, University of Birmingham, UK.Google Scholar
- 7.Che-Haron, C.H. and Jawaid, A., 2004, The effect of machining on surface integrity of titanium alloy Ti-6% Al-4% V. Journal of Materials Processing Technology, Article in Press.Google Scholar
- 8.Da Silva, R.B., 2006, Performance of different cutting tool materials in finish turning of Ti-6Al-4V alloy with high pressure coolant supply technology. PhD Thesis, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil, 299p.Google Scholar
- 9.Siebel, E. and Gaier, M., 1957, Influence of surface roughness on the fatigue strength of steels and non-ferrous alloys. Engineers Digest 18, pp. 109–112, Translation from VDI Zeitschrift 98 (30) (1956), pp. 1715-1723.Google Scholar
- 12.Brinksmeier, E., Walter, A., Janssen, R., and Diersen, P. 1999, Aspects of cooling lubrication reduction in machining advanced materials. Proc. Instn. Mech. Engrs. Vol. 213, Part B, pp. 769-778.Google Scholar
- 21.Boswell, B., Islam, M.N., 2016. Sustainable cooling method for machining titanium alloy. IOP Publishing IOP Conf. Series: Materials Science and Engineering 114, 012021. 1-12. DOI: 10.1088/1757-899X/114/1/012021
- 22.ISO (International Standard) 3685:1993, Tool-life testing with single-point turning tools, p. 48Google Scholar
- 29.Machado, A.R. and Wallbank, J., 1994, The effect of high-pressure jet on machining. In: Proceedings of the Institution of Mechanical Engineers, vol. 208, Part B, pp. 29-38.Google Scholar
- 30.Ezugwu, E.O., Bonney, J., Da Silva, R.B., Machado, A.R. And Sales, W.F. (2005), Observations of tool life and wear mechanisms in high speed machining of Ti-6Al-4V with PCD tools using high pressure coolant supply. Presented at a World Tribology Congress III, Washington, USA, 12-16 September 2005.Google Scholar
- 33.Ezugwu, E.O., Da Silva, R.B., Sales, W.F. and Machado, A.R. (2017) Overview of the machining of titanium alloys. Reference module in earth systems and environmental sciences. Elsevier B.V. Book chapter. DOI: 10.1016/B978-0-12-409548-9.10216-7.