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  • 1.
    Tahir, Mohammed
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Holmberg, Jesper
    Dalarna University, School of Technology and Business Studies, Material Science.
    The impact of tapered work rolls in the finishing mill during hot rolling2012In: Iron & Steel Technology Conference Proceedings, Warrendale, PA: Association for Iron & Steel Technology , 2012, p. 1601-1609Conference paper (Refereed)
    Abstract [en]

    Few studies were done to assess the knowledge of the impact of tapered work rolls in the finishing mill during hot rolling. Hansson, L.et al. studied the use of advanced process models for plate and strip rolling in the Scandinavian Steel Industry [1]. Their work thatincludes simulations of work roll shift with tapered and CVC rolls have results a basis for new investments for profile and flatnesscontrol equipment in steel rolling mills. Rosenthal D. et al. studied a method of influencing the strip contour in the edge region of arolled strip [2]. Special CVC rolls were used as work rolls for influencing the strip contour in the edge areas and to study.Concerning this project, early analysis of work roll data suggested that the tapering of the work rolls was subordinated to the CVCprofileand that a greater than allowed tapering would not affect the result of the rolling process. A grinded profile which is out oftolerance on the other hand, would result in a change in CVC-profile.The purpose of this project was to study the impact of the tapering on the work rolls during hot rolling in the finishing mill. Customgrinded work rolls of CVC-type have been placed in finishing mill, stand 6 (F6) and the axial loads during the following rolling hasbeen studied and evaluated. The deviation of the centre of a strip, flatness of a strip as well as the equivalent camber of the work rollshave also been analyzed for further evaluations of the impact on the rolling results.Theoretically calculation model of the profile of the CVC work rolls and axial force directed toward roll edges was described. Customgrinded work rolls of CVC-type have been placed in mill stand number 6 and the axial loads during the following rolling has beenstudied and evaluated.The impact of tapered work rolls towards CVC profile, axial force, the deviation of the centre of a strip and flatness was presented.The work project finally resulted in new guidelines in grinding of the work rolls in the finishing mill.The work is done in the finishing mill of the strip rolling mill, Figure 1. The strip rolling mill comprising six-high rolling stands wherework rolls and backup rolls at stand 2 to 6 are containing CVC work rolls.Data of the specific strip rolling mill, the type and the characteristics of the used work rolls and strip properties were described [3].Due to different rolling conditions; high temperature in the early stands (thermal cracks) and low temperature and high incident rate inthe last stands (mechanical damage), HSS and HCr rolls were used in stands F1-F3 and IC rolls in stands F4-F6. The studied work rollwas of IC type.

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