Influence of the tribological phenomenon on the tool wear in dry drilling of aluminum alloy AA2024 T351

Abstract
In machining, the formation of chip and tool wear is controlled by the tribological phenomenon at the tool-chip interface. Investigations show that the contact between the tool and the chip tends to change from a sliding contact to a sticking contact. When the cutting speed is increased, the tool rake face temperature can attain large values (sometimes of the order of 1000 °C in the case of machining steels). Without the use of coolants and lubricants, this temperature can be higher. These high temperatures are due to the important deformation work associated with large shear strains in the primary shear zone, and to the friction effects along the tool-chip interface. An experimental analysis of the tool wear for dry machining of aeronautic aluminum alloy AA2024 T351 is proposed. The change in the tribological conditions at the tool-chip interface is discussed.