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Case Studies Real-Time Acquisition and Analysis of Rolling Mill Signals Aluminium rolling mill Manufacturing process of an aluminium reel The P´ chiney Rh´ nalu plant processes aluminium intended for the packaging market. e e The manufacturing process of an aluminium reel is made up of five main stages: 1. The founding eliminates scraps and impurities through heat and chemical processes, and prepares aluminium beds of 4 m × 6 m × m weighing 8–10 tons. | Scheduling in Real-Time Systems. Francis Cottet Joëlle Delacroix Claude Kaiser and Zoubir Mammeri Copyright 2002 John Wiley Sons Ltd. ISBN 0-470-84766-2 9 Case Studies Real-Time Acquisition and Analysis of Rolling Mill Signals Aluminium rolling mill Manufacturing process of an aluminium reel The Pechiney Rhenalu plant processes aluminium intended for the packaging market. The manufacturing process of an aluminium reel is made up of five main stages 1. The founding eliminates scraps and impurities through heat and chemical processes and prepares aluminium beds of 4 m x 6 m x m weighing 8-10 tons. 2. Hot rolling reduces the metal thickness by deformation and annealing and transforms a bed into a metal belt mm thick and wound on a reel. 3. Cold rolling reduces the metal down to 250 micrometres i m . 4. The thermal and mechanical completion process allows modification of the mechanical properties of the belt and cutting it to the customer s order requirements. 5. Varnishing consists of putting a coat of varnish on the belts sold for tins food packaging or decoration. The packaging market tinned beverages and food requires sheets with a strict thickness margin and demands flexibility from the manufacturing process. Each rolling mill therefore has a signal acquisition and analysis system that allows real-time supervision of the manufacturing process. Cold rolling Mill L12 is a cold rolling mill single cage with four rollers non-reversible and kerosene lubricated. Its function is to reduce the thickness of the incoming belt which may be between and 8 mm and to produce an output belt between and mm thick and with a maximum width of 2100 mm. The minimum required thickness margins are 5 m around the nominal output value. The scheme of the rolling mill is given in Figure . 214 9 CASE STUDIES The thickness reduction is realized by the joint action of metal crushing between the rollers and belt traction. The belt output speed may reach 30m s

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