Abstract
Drilling machinability of wrought aluminum alloys was studied in terms of cutting resistance, surface roughness and chip formation. The results obtained were as follows.
(1) Both torque and thrust increased in proportion to a feed rate. As cutting speed increased, torque decreased whereas thrust remained nearly constant.
(2) It was generally observed that large torque was needed for soft materials while large thrust was needed for hard materials.
(3) In general, good surface finish was obtained for hard materials. Chip welding on a tool was observed for material 1100. This made drilling of material 1100 more difficult than that of other materials. Damage of deep scratches was easily formed on a finished surface of a hole by a drill edge and welded chips.
