Abstract
Vertical rolling is an important technique used to control the width of continuous casting slabs in the hot-rolling field. Accurate prediction of vertical rolling force is a core point maintaining rolling-mill equipment. Owing to the limitation of the algorithm in use, the prediction accuracy of most vertical rolling force models based on the energy method can only reach more than 10%. Therefore, it is challenging to optimize the rolling-force model to improve prediction accuracy. An innovative approach for optimizing the calculation of vertical rolling force with a unified yield criterion is presented in this paper. First, the maximal width of a dog-bone region is determined by the slip-line method, and the dog-bone shape is described using a sine-function model. Second, the velocity and corresponding strain-rate fields satisfying kinematically admissible conditions are proposed to calculate the total power of the vertical rolling process. Finally, the analytical solution of the rolling force and the dog-bone-shape model is obtained by repeatedly optimizing the weighted coefficient b of intermediate principal shear stress on the yield criterion. Moreover, the effectiveness of the proposed mechanical model is verified by measured data in the strip hot-rolling field and other models’ results. Results show that the prediction accuracy of the vertical rolling force model can be improved by optimizing the value of b. Then, the impacts of reduction rate, initial thickness, and friction factor on dog-bone shape size and vertical rolling force are discussed.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- W 0, W E :
-
Half of the initial and final slab width
- W x :
-
Half of the slab width
- ΔW :
-
Unilateral reduction,\(\Delta W{ = }{W_0} - {W_E}\)
- ΔW x :
-
Unilateral reduction in deformation zone, \(\Delta {W_x}{ = }{W_0} - {W_x}\)
- h 0 :
-
Half of the initial slab thickness
- h Ι, h ΙΙ :
-
Half of the slab thickness in zones I and II
- h p :
-
Peak height of deformation zone
- h r :
-
Edge height of deformation zone
- R :
-
Radius of edge roll
- l :
-
Projected length of contact arc, \(l = \sqrt {2R\Delta W}\)
- v 0 :
-
Entrance velocity
- v R :
-
Peripheral velocity of edge roll
- \(\theta\) :
-
Bite angle, \(\theta { = }{\sin^{ - 1}}\left( {{l \mathord{\left/ {\vphantom {l R}} \right. \kern-\nulldelimiterspace} R}} \right)\)
- \(\varphi\) :
-
Contact angle
- d 0 :
-
The maximum width of dog bone region
- \({d}_{\varphi }\) :
-
Deformation zone’s width during edge rolling
- d E :
-
Deformation zone’s width after edge rolling
- β :
-
Undetermined parameters
- b :
-
Yield criterion parameter
- \({v}_{x},{v}_{y},{v}_{z}\) :
-
Components of velocity vector
- J * :
-
Total power
- \({\dot{W}}_{i}\) :
-
Internal plastic deformation power
- \({\dot{W}}_{f}\) :
-
Friction power
- \({\dot{W}}_{s}\) :
-
Shear power
- \({\sigma }_{s}\) :
-
Material yield stress
- k :
-
Yield shear stress, \(k = {{\sigma_s} \mathord{\left/ {\vphantom {{\sigma_s} {\sqrt 3 }}} \right. \kern-\nulldelimiterspace} {\sqrt 3 }}\)
- m :
-
Friction factor
- \({J}_{\mathrm{min}}^{*}\) :
-
Minimum value of total power
- \({\tau }_{f}\) :
-
Friction stress
- M :
-
Rolling torque
- \(\omega\) :
-
Roll angular velocity
- \(\overline{P }\) :
-
Rolling force
- \({n}_{\sigma }\) :
-
Stress state coefficient
- X :
-
Arm coefficient
- x, y, z :
-
The directions of length, width, and thickness
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Funding
This study was funded by the National Natural Science Foundation of China (No. U20A20187) and the National Key R&D Program of China (No. 2017YFB0304100).
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Yufeng Zhang wrote the first draft of the paper. All authors revised and approved the final version of the manuscript.
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Zhang, Y., Zhao, M., Xu, L. et al. Optimization solution of vertical rolling force using unified yield criterion. Int J Adv Manuf Technol 119, 1035–1045 (2022). https://doi.org/10.1007/s00170-021-08333-3
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DOI: https://doi.org/10.1007/s00170-021-08333-3