ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A rapid flow of materials with little intermediate buffering between steel mill and hotstrip mill has many benefits. One is energy savings due to raised charging temperature in the reheatfurnaces of the hot strip mill. Another is that tied capital is freed up, thereby improving milleconomy. Still, it is not unusual that average lead-time is in the order of days, or even weeks.The aim of the present work was to show how lead-times from casting to rolling could beimproved by changes in the scheduling function. A System Dynamics model of a stainless steelstrip production facility with continuous caster and hot rolling mill was created. The model wasused to study the dynamics of the system in response to changes in parameters that defined thescheduling configuration.More frequent schedule updating generally resulted in less work in process (WIP) and shorterlead times from casting to rolling, with resulting higher charging temperatures. The amount ofoscillation in the system was also reduced. More frequent work roll changes were required whenscheduling frequency increased, resulting in an increased fraction of setup time in relation to totalprocessing time. Therefore, a development towards increased scheduling frequency may have to becomplemented by efforts to reduce changeover times.The conclusion was that dynamic scheduling routines with frequent schedule updating result inbetter overall performance of the system due to lower WIP and better heat utilization. Dynamicscheduling routines with frequent updates make the system respond better to changes in the systemand give better overall performance. The result is lower WIP, increased energy efficiency and lessoscillation in the system
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.897.pdf
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