Transverse bending, a common shape defect of hot-rolled strips, is generally controlled based on experience, which lacks quantitative study. This leads to some production problems such as difficult feeding and surface scratching in subsequent processes. Based on the principle of elastic mechanics, the mechanism of transverse bending in the process of uncoiling is studied and an analytical model is established. Then the relationship between transverse bending and influence factors, including the curvature radius of longitudinal bending, strip width and strip thickness, is obtained. The study indicates that the transverse bending is caused by longitudinal bending before uncoiling. And the strip width and the curvature radius of longitudinal bending have a great influence on the transverse bending but the strip thickness has little influence. The transverse bending diminishes nonlinearly with the increase of curvature radius of longitudinal bending and increases nonlinearly with the increase of strip width.
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References
1.
MückeGKarhausenKFPützPD.Methods of describing and assessing shape deviations in strips. Metal Plant Technol Int. 2002;25(3):58–60.
2.
ZhengXTLiHBZhangJet al.C-shaped warp control of hot-rolled thin strip in coiling process // Proceedings of Chinese Society for Metals Annual Meeting of Young Scientists. Beijing. 2014;24:206–211.
3.
MückeGKarhausenKFPützPD.Shape deviations in strips: classification, development, measuring and elimination as well as methods of quantitative assessment. Stahl und Eisen(Germany). 2002;122(2):33–39.
4.
KnightCWHardySJLeesAWet al.Investigations into the influence of asymmetric factors and rolling parameters on strip curvature during hot rolling. J Mater Process Technol. 2003;134(2):180–189. doi: 10.1016/S0924-0136(02)00469-7
5.
LeeCHParkJPMoonYH.Differential speed rolling to reduce warping in bimetallic slab. Adv Mech Eng. 2014;6:375162. doi: 10.1155/2014/375162
6.
JaroslawMHenrykDMarcinKet al.Theoretical analysis of the asymmetric rolling of sheets on leader and finishing stands. J Mater Process Tech. 2003;138(1–3):183–188. doi: 10.1016/S0924-0136(03)00069-4
7.
ZhangQDDaiJT.Simulation of warping deformation in thin steel strips. J Univ Sci Technol Beijing. 2011;33(8):1006–1012.
8.
ZhangQDLuXFDaiJTet al.Analysis of warping deformation for cold-rolled strips. J Univ Sci Technol Beijing. 2014;36(3):378–382.
9.
DaiJTZhangQD.Mechanism of cross bow in single-roll transmission temper mill. Adv Mater Res. 2011;145:216–222. doi: 10.4028/www.scientific.net/AMR.145.216
10.
BaiZHHLiLHLiMZet al.Calculation model of hot rolled strip warp after coiling. J Yanshan Univ. 2013;37(3):228–233.
11.
KitahamaM.Profile control of hot rolled strip by working roll shifting (K-WRS) mill. Iron Steel Eng. 1987;64(11):34–43.
12.
HeARKongFFShaoJ.Novel curved roll contour technology for profile control in hot strip mills. Ironmak & Steelmak. 2015;42(1):55–62. doi: 10.1179/1743281214Y.0000000200
13.
HeARShaoJSunWQ.Theory and practice of shape control. Beijing: Metall Ind Press; 2016.
14.
ShaoJHeARSunWQ.Precise control core technology of hot rolling strip in whole production process. China Met. 2017;27(5):45–50.
15.
LiZLiHYuanGet al.Research and application of ultra-fast cooling system and velocity controlled strategy for hot rolled strip. Steel Res Int. 2015;86(5):478–488. doi: 10.1002/srin.201400077
16.
WangXDYangQHeAR.Calculation of thermal stress affecting strip flatness change during run-out table cooling in hot steel strip rolling. J Mater Process Technol. 2008;207(1):130–146. doi: 10.1016/j.jmatprotec.2007.12.076
17.
YuWWangYF.Relationship between cooling parameters and warping of hot rolled strips. J Univ Sci Technol Beijing. 2016;38(12):1734–1740.
18.
Weisz-PatraultDKoedingerT.Residual stress on the run out table accounting for multiphase transitions and transformation induced plasticity. Appl Math Model. 2018;60:18–33. doi: 10.1016/j.apm.2018.02.026
19.
QiuZSHHeARShaoJ.Numerical simulation of transverse bending of hot rolled medium carbon steel strip. Iron & Steel. 2017;52(5):61–65.
20.
QiuZSH.Research on the shape evolution of the hot rolled steel strip after finish mill. Beijing, China: University of Science and Technology Beijing; 2017.
21.
MasuiTKasedaYAndoK.Warp control in strip processing plant. ISIJ Int. 1991;31(3):262–267. doi: 10.2355/isijinternational.31.262
22.
QinJZhangQDHuangKF.Spline finite element for strip C-shape warp. Proceedings of National Structure Engineering Meeting. 2010;1:552–557.
23.
BaumgartMSteinboeckASaxingerMet al.Elasto-plastic bending of steel strip in a hot-dip galvanizing line. Acta Mech. 2017;228(7):2455–2470. doi: 10.1007/s00707-017-1824-5
24.
XuZHL.Theory of elastic mechanics. 4nd Ed. BeiJing: High Educ Press; 2006.
25.
JohnstonER.Mechanics of materials. 6nd Ed. New York (NY): McGraw-Hill Inc; 2012.
26.
GensamerM.Strength and ductility. Metallogr, Microst, and Anal.2017;6(2):171–185. doi: 10.1007/s13632-017-0341-1
27.
Comparison of solutions from different displacement boundary conditions at fixed end of cantilever beams. J Zhejiang Univ (Eng Sci). 2014;48(11):1955–1961.
