Journal
MACHINING SCIENCE AND TECHNOLOGY
Volume 15, Issue 4, Pages 376-391Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10910344.2011.620910
Keywords
aluminum machining; lubricity; metalworking fluids; minimum quantity lubrication (MQL); mist; wettability
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Minimum Quantity Lubrication (MQL) machining involves the application of a minute amount of an oil-based lubricant to the machining process in an attempt to replace the conventional flood coolant system. Understanding the correlations between fluid properties and MQL performance can help in selecting lubricants from a variety of choices without going through extensive machining tests. This study compared nine different MQL fluids in terms of their physical properties, wettability, tribological properties (lubricity and extreme pressure (EP) properties), mist characteristics and machinability to determine the correlation of measured properties and MQL drilling and reaming performance. Results show that low fluid viscosity, high mist concentration, large mist droplet diameter and high wettability were best correlated with good machinability. Although it is difficult to draw strong relationships, the optimal machining in a mild cutting condition was found with the low viscosity fluids, which may also have the highest mist concentration, largest drops and best wettability.
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