Deformation State of Aluminum-6 Silicon Alloy (319 Al) Subjected to Orthogonal Cutting at Different Speeds and Feed Rates

摘要

Dry machining of cast aluminum 6%-Si alloy 319 Al was studied. Investigations were carried out to understand deformation mechanisms leading to discontinuous chip formation during the process. A force transducer was constructed for measuring cutting and thrust forces which increased with an increase in feed and with a decrease in cutting speed. Surface roughness increased with an increase in feed. Plastic strain and flow stress estimations in region ahead of tool-tip indicated high strains (1.8) and stresses (369MPa) in shear zone. Optical investigations showed that zone of silicon particle damage below machined surface increased with feed. Theoretically estimated specific energy for cutting correlated well with values obtained from force measurement results. Experimental observations indicated that 319 Al alloy possesses a good degree of machinability under dry conditions.