In the paper, a die for the production of a complex hollow profile made by AA6060 alloy on an industrial 2500 ton press has been manufactured and tested under strict monitored conditions. In particular 5 thermocouples were placed in proximity of interesting positions inside the die: 3 next to the bearings and two near the welding chambers. A self-calibrated pyrometer was used for the temperature monitoring of profile. Press loads, ram speeds and container temperatures were continuously recorded directly from the press system. Six billets were initially extruded in order to reach a steady state condition being the last three used as industrial benchmark for the 2011 edition of the ICEB conference. Then the nitrogen was completely and partially opened and the evolution of the temperature in the die and in the profile recorded together with the process load. The effect on bearing temperature was extreme, in particular in proximity of nitrogen inlet, while almost no change in welding chamber thermocouples and in the process load was revealed.

Effect of liquid nitrogen die cooling on extrusion process conditions / Donati, Lorenzo; Segatori, Antonio; Reggiani, Barbara; Tomesani, Luca; Bevilacqua, Pietro Alfredo. - 491:(2012), pp. 215-222. (Intervento presentato al convegno 2011 International Conference on Extrusion and Benchmark, ICEB 2011 tenutosi a Bologna; Italy nel 3-5 October 2011) [10.4028/www.scientific.net/KEM.491.215].

Effect of liquid nitrogen die cooling on extrusion process conditions

REGGIANI, Barbara;
2012

Abstract

In the paper, a die for the production of a complex hollow profile made by AA6060 alloy on an industrial 2500 ton press has been manufactured and tested under strict monitored conditions. In particular 5 thermocouples were placed in proximity of interesting positions inside the die: 3 next to the bearings and two near the welding chambers. A self-calibrated pyrometer was used for the temperature monitoring of profile. Press loads, ram speeds and container temperatures were continuously recorded directly from the press system. Six billets were initially extruded in order to reach a steady state condition being the last three used as industrial benchmark for the 2011 edition of the ICEB conference. Then the nitrogen was completely and partially opened and the evolution of the temperature in the die and in the profile recorded together with the process load. The effect on bearing temperature was extreme, in particular in proximity of nitrogen inlet, while almost no change in welding chamber thermocouples and in the process load was revealed.
2012
2011 International Conference on Extrusion and Benchmark, ICEB 2011
Bologna; Italy
3-5 October 2011
491
215
222
Donati, Lorenzo; Segatori, Antonio; Reggiani, Barbara; Tomesani, Luca; Bevilacqua, Pietro Alfredo
Effect of liquid nitrogen die cooling on extrusion process conditions / Donati, Lorenzo; Segatori, Antonio; Reggiani, Barbara; Tomesani, Luca; Bevilacqua, Pietro Alfredo. - 491:(2012), pp. 215-222. (Intervento presentato al convegno 2011 International Conference on Extrusion and Benchmark, ICEB 2011 tenutosi a Bologna; Italy nel 3-5 October 2011) [10.4028/www.scientific.net/KEM.491.215].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1153278
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