Precision cryogenic drilling, turning and grinding of Ti-64 alloys Online publication date: Tue, 16-Feb-2010
by V.C. Venkatesh, S. Izman, T.C. Yap, P.V. Brevern, N.S.M. El-Tayeb
International Journal of Precision Technology (IJPTECH), Vol. 1, No. 3/4, 2010
Abstract: Ti-6Al-4V alloys are difficult to machine because of their low thermal conductivity and high strength and as a result high wear rates occur with low tool life. Two renowned researchers Chattopadhyay in India and Hong in the USA have reported substantial improvement in tool life during cryogenic turning of Ti-6Al-4V alloys as compared to turning under wet and dry conditions. However, the only work reported on cryogenic grinding is by Chattopadhyay et al. and they indicated that cryogenic CBN bonded grinding performed poorly when compared to wet grinding. The work done by the authors using the novel bondless diamond grinding wheel with cryogenic liquid nitrogen and oil mist showed improvement in surface finish, flatness, and lowering of forces. The only reported work on cryogenic drilling is by Bhattacharyya et al. in New Zealand and the work material was Kevlar composites that machined better when compared to wet grinding. Pin on disc test indicated different wear modes occurring in a cryogenic environment.
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