Aim of the work is to investigate different strategies in balancing material flow during direct extrusion through porthole dies. Two AA6082 hollow profiles were simultaneously extruded by a single die with different portholes extrusion ratio, dissimilar welding chambers and different bearing lengths. A strict process control was realized by measuring thermal conditions in the die by means of 6 thermocouples and on the profiles by a self calibrating pyrometer for aluminum alloy applications. Several billets were extruded at different ram speeds (2 to 7 mm/sec) and the effect of die design on surface quality, profile lengths and thermal field was recorded. The profiles were then sectioned and the position of the seam welds in the profiles identified and compared also with the profiles tip.
Effect of porthole design and welding chamber dimensions on material flow and weld deformability of extruded aluminium profiles / L. Donati; N. Ben Khalifa; L. Tomesani; A.E. Tekkaya. - STAMPA. - 504-506:(2012), pp. 523-528. (Intervento presentato al convegno 15th Conference of the European Scientific Association on Material Forming, ESAFORM 2012 tenutosi a Erlangen; Germany nel 14-16 March 2012) [10.4028/www.scientific.net/KEM.504-506.523].
Effect of porthole design and welding chamber dimensions on material flow and weld deformability of extruded aluminium profiles
DONATI, LORENZO;TOMESANI, LUCA;
2012
Abstract
Aim of the work is to investigate different strategies in balancing material flow during direct extrusion through porthole dies. Two AA6082 hollow profiles were simultaneously extruded by a single die with different portholes extrusion ratio, dissimilar welding chambers and different bearing lengths. A strict process control was realized by measuring thermal conditions in the die by means of 6 thermocouples and on the profiles by a self calibrating pyrometer for aluminum alloy applications. Several billets were extruded at different ram speeds (2 to 7 mm/sec) and the effect of die design on surface quality, profile lengths and thermal field was recorded. The profiles were then sectioned and the position of the seam welds in the profiles identified and compared also with the profiles tip.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
