ADHESION IN DRILLING PROCESS OF ALUMINUM ALLOY

Abstract

Aluminum alloys have been widely used for automobile and aircraft parts. In cutting of aluminum alloy, adhesion sometimes occurs to deteriorate surface finish. The study investigates the adhesion characteristics in drilling of aluminum alloy (A7075) for the cutting parameters. An evaluation approach is presented to characterize adhesion in the cutting tests.
Adhesion on the rake face of the tool is investigated in drillings of a plate for the cutting speed and the feed rate. Much adhesion appears around cutting speeds ranged from 40 to 60 m/min, which is associated with the stress and the temperature on the tool face. The adhesion area expands with the feed rate in accordance with the chip contact length on the rake face. At a low feed rate, an adhesion zone is restricted on a tool tip with the chamfer. Two adhesion zones appear on the tool tip and the chip contact area on the rake face at high feed rates.