G - Physics – 05 – D
Patent
G - Physics
05
D
G05D 23/19 (2006.01) B21C 31/00 (2006.01)
Patent
CA 2119941
The process described gives a process for the cyclic control of extruders and facilitates the precise control of an extruder to achieve maximum output and at the same time optimal quality of the extruded profiles. To do this, the extrusion velocity is controlled in such a way that the profile exit temperature is constant and equal to a prescribed temperature run. Thereby the extrusion velocity and the profile exit temperature are measured over the complete cycle interval for each and every cycle k, and with the knowledge of the relationship between these quantities and the run of the extrusion velocity of the cycle k, the run of the extrusion velocity for the (k+ 1 )th cycle is determined, such that the control error and the control effort are as low as possible and after completion of the (k+ 1 )th extrusion cycle the whole process is repeated for every subsequent cycle till the whole extrusion programme is completed. The process is especially suited for the manufacture of extruded profiles of metals with low and/or wavelength dependent emmissivity and/or variable surface charakteristics, in particular for the manufacture of extruded aluminium and aluminium alloy profiles.
Buchheit Karl-Heinz
Pandit Madhukar
Mannesmann Ag
Swabey Ogilvy Renault
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