Abstract
Minimum quantity lubrication (MQL) as a green technology is widely employed in metal removal manufacturing, which can achieve lower cutting temperature and higher machining efficiency environmentally. However, how to evaluate the tool temperature distribution in drilling process with MQL is still significantly lacking. For this purpose, a tool-foil thermocouple system was developed and the influence of cooling conditions and cutting variations on tool temperature has been experimentally analyzed during high-throughput drilling of aluminum alloy AA2024 in current study. Results indicate that the maximum temperature along cutting edge is observed near drill center due to heat accumulation. Using MQL can decrease the temperature difference between drill center and outer corner compared with dry and air cooling conditions. Temperature distribution profiles are more sensitive to feed rate than cutting speed. Increasing feed rate can result in a great increasing of average temperature. Chipping is only observed on the peripheral corner under MQL condition, while adhesion and built up edge (BUE) almost extend across the whole cutting edge under dry drilling due to the absence of lubrication and coolant.
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