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Influence of Extrusion Speed and Lubrication on Extrusion Behavior of AA6061 as-cast, AA6061-O and AA6061-T6
Arsyad H.
Aip Conference Proceedings
Abstract
Metal products with a uniform cross-section are produced by the extrusion process. The quality of extruded products depends on the type of metal, the selection of extrusion process parameters, the die geometry, and the lubrication conditions. This study aims to determine the extrusion behaviour of AA6061 as cast, AA6061-O, and AA6061-T6. Extrusion is conducted by varying the extrusion speed and lubrication conditions. The extrusion behaviour is assessed by extrusion force, microstructure, surface roughness, and hardness value after extrusion. Extrusion was carried out by direct extrusion method with a constant extrusion ratio of 1.2 and with die angle is 10°. The results show that the highest average hardness value is obtained in the 6061-T6 sample which is 79.06 HRF and the lowest average hardness value is 9.33 HRF for the AA6061-O sample. The highest extrusion force was obtained for AA6061-O without lubrication with an extrusion speed of 10 mm/minutes, which is 90.45 kN. While the lowest extrusion force was 9.15 kN obtained for AA6061-T6 with lubrication conditions at an extrusion speed of 10 mm/minutes. The lowest surface roughness value was obtained for the AA6061-T6 sample, 2.65 um at an extrusion speed of 2 mm/minutes, and the highest surface roughness was obtained in the 6061-O sample which was 4.83 um also at an extrusion speed of 2 mm/minutes.