Abstract
By introduction of an interstand tension in the order of 10% of the actual yield stress of the rolled material in the intermediate stage of wire rod rolling, it is possible to increase the intermediate reductions without excessive increase of energy supply for rolling. Thus, an eight passes finishing block can be replaced by two intermediate stands and a four stand finishing block of a module type. This configuration gives two improvements on the productivity in a wire rod mill for stainless steel. First, the finish rolling speed can be increased from typically 60 m/s up to 80 m/s, meaning 33% higher rolling rate. Second, the modern twin module block system gives the possibility to introduce a single family rolling system, which gives a reduction of the downtime for roll and groove changing in the order of 20% of the production time, depending on the product mix in the mill.
Zusammenfassung
Durch Einführen eines 10%igen Längszugs im Knüppel während des Streckwalzens ist es mögllich, die Dickenabnahmen ohne Erhöhung des Energieverbrauchs zu vergrößern. So kann ein achtgerüstiger Fertigblock ersetzt werden durch zwei Zwischengerüste und einen viergerüstigen Fertigblock. Durch eine solche Anordnung lassen sich Produktivitätsverbesserungen des Walzwerks erzielen: Erstens kann die Endwalzgeschwindigkeit von typischen 60 m/s auf 80 m/s erhöht werden, was ein 33%ige Erhöhung der Walzleistung bedeutet. Zweitens eröffnet der moderne Endwalzblockmodul die Möglichkeit, eine einzige Kaliberfamilie zu installieren, wodurch sich eine Totzeitverminderung von 20% beim Walzenwechsel erzielen lässt.
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Lundberg, S.E., Eriksson, C. Ultra high speed rolling of stainless steel wire rod by means of interstand tensions. Berg Huettenmaenn Monatsh 150, 5–11 (2005). https://doi.org/10.1007/BF03165142
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DOI: https://doi.org/10.1007/BF03165142