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Thermal crown and wear crown of work roll (TWW) are the main interfering factors of loaded roll gap profile in tandem cold rolling (TCR). However, the effect of TWW on the strip shape is not well understood. This paper presents a quantitative study about the effect of TWW on the strip crown and strip flatness based on a novel 3D multi-pass elastic-plastic finite element (EPFE) model that has been validated by industrial trials in the TCR. The results show that the thermal crown introduces the centre wave and quarter wave, while the wear crown brings in the edge wave and edge-centre coupled wave; the thermal crown has a larger influence efficiency on the quadratic strip shape than the wear crown does, while the wear crown exerts a larger influence efficiency on the quartic strip shape than the thermal crown does. In addition, the influence efficiency of TWW on the strip crown decreases nonlinearly with an increase in strip plastic rigidity from Pass 1 (P1) to Pass 5 (P5). This is the fi ....
Roll bending is a common technique to regulate the strip shape in tandem cold rolling (TCR), but its regulation ability at each stand is poorly understood at present. In this study, based on a 3D multiple stand elasto-plastic finite element (EPFE) model, the effects of work roll bending (WRB) and intermediate roll bending (IRB) on the strip crown, strip flatness and elastic deformation of work roll (WR) were quantitatively studied at each stand in the TCR. Results show that the regulation abilities of WRB and IRB on the strip crown both show a downward tendency from Stand 1 (S1) to Stand 5 (S5), which both depend on the strip plastic rigidity. Moreover, under various WRBs and IRBs, the strip shape is mainly determined by the elastic deflection of WR in the upstream stand, while it is determined combinedly by the elastic deflection and flattening deformation of WR in the downstream stand. Furthermore, the regulation ability of WRB on the strip crown and quadratic flatness is at least 2. ....
During tandem hot rolling (THR), the rolling force plays an important role in strip shape control, but the influence mechanism of the rolling force on the strip shape is still currently unclear. This paper proposes a novel 3D multi-stand coupled thermo-mechanical finite element (FE) model for the THR developed employing a segmentation modelling strategy and data transfer technologies. This developed FE model has been validated by industrial experiments. Besides, the effects of rolling force on the strip shape (including strip crown and flatness) in the THR have been quantitatively studied. Results show that the strip crown increases with the rolling force at each stand, while the regulation efficiency of rolling force on the strip crown decreases continuously from (Finish stand 1) F1 to (Finish stand 7) F7, which is attributed to the significant increase in strip plastic rigidity from F1 to F7. Furthermore, lateral metal flow and strip plastic rigidity have a coupled effect on the regu ....
Intermediate roll shifting (IRS) is widely used for improving the strip shape in the six-high tandem cold mill, but most related studies are limited to a single stand. To fill the knowledge gap, a three-dimensional (3D) multi-stand elastic–plastic finite element (FE) model was developed for a continuously variable crown (CVC)-6 tandem cold mill using data transfer, which was then validated by industrial experimental results. Based on this FE model, the effects of the IRS on the strip crown, strip flatness, loaded roll gap profile and contact normal stress between rolls at each stand were quantitatively analysed. The results show that from Stand 1 (S1) to Stand 5 (S5), the regulation ability of the IRS on the strip crown shows a decreasing trend, which depends on the strip plastic rigidity; in contrast, the regulation ability on the quadratic flatness experiences an obvious increase from S1 to Stand 4 (S4), then a drop at S5, while the IRS exerts little effect on the quartic flatness ....
In the tandem cold rolling (TCR) process, the work hardening effect has a direct influence on the rolling force, which affects the strip shape, including the strip crown and flatness, significantly. However, previous studies focus on the single finite element (FE) model, ignoring the work hardening effect. To investigate the effect of the rolling force on strip shape, herein, a novel elastic–plastic multistand FE model for the TCR process with consideration of the work hardening effect is proposed for the first time using a segmentation modeling strategy, data transfer technologies, and element remesh technology. The proposed FE model is verified by comparing with industrial experimental results. The effects of rolling force on the strip crown and flatness at each stand are investigated quantitatively using the developed FE model. The results illustrate that the strip crown at 40 mm from the edge (C 40) is in a decreasing trend when the rolling force decreases from stand 1 (S1) to st ....