Abstract
This paper discusses the influence of heat treatment condition of aluminum alloy upon cutting mechanism. The cutting experiments of A2017-T3 and A2017-O with a cutting speed of from 0.5 m/s to 160 m/s are performed using a high-speed impact cutting tester developed. The difference of the cutting mechanism due to the heat treatment condition comes to appear gradually, when the cutting speed exceeds 80 m/s. The influences of heat treatment condition upon the plastic deformation at the shear plane and the friction at the tool-chip interface seem to become clearly only after the strain rate becomes above 10^7 1/s.
