Drilling machinability of wrought pure aluminum for industrial use

Machinability of wrought aluminum (1100-0) in drilling was studied together with overshooting of cutting force, increase of chip thickness and change of chip shape. Samples of six different thickness (10, 15, 20, 25, 30, 35 and 50mm) were tested by four kinds of tools (4, 6, 8 and 10mm in diameter). The results obtained are as follows: (1) Torque and thrust were proportinal to drilling depth. (2) Cutting force increased with feed and cutting speed. Difference between the highest and the lowest cutting force was large for the high feed case and for thick samples. (3) The drilling limit per pass increased as the drill diameter, the feed speed and the cutting speed increased. (4) Small shear angles were considered to be produced by a certain mechanism of friction between chips and tool faces.