Abstract
Rapid wear progression of cutting insert associated with attainment of excessive tool-tip temperature are indispensable causes which limit operational domain of cutting velocity during dry turning of Ti64 alloy. Again, to counteract demerits of flood cooling, jet of air-oil mist (MQL technology) is employed in which water-based coolants or vegetable oils are highly preferable. On the other hand, inclusion of nano-additives within base fluid, and supply the same through MQL system (NFMQL) is also a trendy area of research. Application potential of NFMQL is understood over conventional MQL in terms of better cooling, and lubrication effects due to improved thermo-physical, and tribological properties of the resultant cutting fluid. In this context, present study aims to assess performance of MQL jet containing biodegradable Jatropha oil (carried by pressurized air) when applied during longitudinal turning of Ti64 work alloy. In addition, advantages of 2D layered-structured graphene nanoplatelets (when dispersed into Jatropha oil), in purview of machining performance on difficult-to-cut Ti64 alloy under NFMQL, are studied in this work. Experimental data are compared on the basis of different lubrication conditions (dry, conventional MQL, and NFMQL). Morphology of tool wear is studied in detail. The work extends towards studying chip morphology and machined surface finish of the end product, as influenced by variation in lubrication conditions.
Highlights
All experimental trails for the present study are performed on a heavy duty precision lathe (NH26, HMT Machine Tools Limited, Bengaluru)
Though a few research groups applied Multi-Walled Carbon Nanotubes (MWCNTs) based nanofluids during machining of Ti64; feasibility of using graphene powder, as nano-additives, is yet to be explored adequately in the context of NFMQL machining on the same work alloy
For providing cooling as well as lubrication, biodegradable Jatropha oil is used as base cutting fluid both for MQL, and NFMQL machining
Summary
In purview of industrial applicability, assessment of machinability of any work material is necessary. Songmei et al [19] prepared four different types of nanofluids with natural vegetable oil by dispersing nano-particles of MoS2, Al2O3, graphite, and Cu, respectively, in 1%, and 2% of volume fractions. These nanofluids were applied during milling of Ti64. Though a few research groups applied MWCNT (dispersed in vegetable oils) based nanofluids during machining of Ti64; feasibility of using graphene powder, as nano-additives, is yet to be explored adequately in the context of NFMQL machining on the same work alloy. Application potential of nanofluid, prepared by dispersing graphene nanoplatelets within Jatropha oil is studied
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