On the benefits of sub-zero air supplemented minimum quantity lubrication systems: An experimental and mechanistic investigation on end milling of Ti-6-Al-4-V alloy

Minimum quantity lubrication is considered a viable alternative to flood lubrication systems. The effect of the inclusion of sub-zero air in the MQL aerosol – called hybrid MQL or minimum quantity cooling lubrication (MQCL) - in milling Ti-6-Al-4-V is studied by comparing cutting temperatures, surfa...

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Bibliographic Details
Published in:	Tribology international 2018-03, Vol.119, p.464-473
Main Authors:	Mark Benjamin, D., Sabarish, V. Narayanan, Hariharan, M.V., Samuel Raj, D.
Format:	Article
Language:	eng
Subjects:	Adiabatic flow Chip underside roughness Chips Coefficient of friction Cutting fluids End milling Friction Friction coefficient Hybrid MQL Lubricants & lubrication Lubrication systems Lubricity Minimum quantity cooling lubrication (MQCL) Shear zone Surface roughness Titanium base alloys Vanadium
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Summary:	Minimum quantity lubrication is considered a viable alternative to flood lubrication systems. The effect of the inclusion of sub-zero air in the MQL aerosol – called hybrid MQL or minimum quantity cooling lubrication (MQCL) - in milling Ti-6-Al-4-V is studied by comparing cutting temperatures, surface roughness and chips produced by both the systems. MQCL shows considerable improvement over MQL, with its primary action being the improved lubricity of the cutting fluid at lower temperatures, and easier separation of chips from the rake face, assisted by the cold air. Chips produced in MQCL are also thinner, with reduced radii, lower underside roughness, and less segmentations produced due to adiabatic shear zone. The friction coefficient at the chip-tool interface is also lower. [Display omitted] •Effect of sub-zero air in minimum quantity lubrication systems is studied.•Lower tool-rake friction coefficients are observed in MQCL.•Reduced friction coefficients are manifest as differences in chip morphology.•Various cooling and lubrication mechanisms in MQCL are discussed.
ISSN:	0301-679X 1879-2464