Effectiveness of edge drop control of tapered work roll shifting during tandem cold rolling process

WANG Xiao-chen; FENG Xia-wei; XU Dong; YANG Quan; SUN Ji-quan

doi:10.13374/j.issn2095-9389.2019.03.01.003

Volume 42 Issue 2

Feb. 2020

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2020 > 42(2): 242-248

WANG Xiao-chen, FENG Xia-wei, XU Dong, YANG Quan, SUN Ji-quan. Effectiveness of edge drop control of tapered work roll shifting during tandem cold rolling process[J]. Chinese Journal of Engineering, 2020, 42(2): 242-248. doi: 10.13374/j.issn2095-9389.2019.03.01.003

Citation:

WANG Xiao-chen, FENG Xia-wei, XU Dong, YANG Quan, SUN Ji-quan. Effectiveness of edge drop control of tapered work roll shifting during tandem cold rolling process[J]. Chinese Journal of Engineering, 2020, 42(2): 242-248. doi: 10.13374/j.issn2095-9389.2019.03.01.003

Citation:

PDF( 969 KB)

Effectiveness of edge drop control of tapered work roll shifting during tandem cold rolling process

doi: 10.13374/j.issn2095-9389.2019.03.01.003

WANG Xiao-chen^{1, 2
,},
FENG Xia-wei^{1, 2, 3
,
,},
XU Dong^{1, 2},
YANG Quan^{1, 2},
SUN Ji-quan¹

1.
Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
2.
National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, China
3.
Instrumentation Technology and Economy Institute, Beijing 100055, China

More Information

Corresponding author: E-mail: fengxiawei@qq.com
Received Date: 2019-03-01
Publish Date: 2020-02-01

Abstract

Abstract

In the process of tandem cold rolling of nonoriented silicon steel strip, it is imperative to design the control strategy and initial values of the edge drop control efficiency coefficient to achieve automated control in the edge drop by shifting tapered work roll. To obtain these values, intensive modeling is needed to study not only the effects of work roll deformation, metal transverse flow, and inter-stand deformation on tapered work roll shifting at one stand but also the effects of different work roll shifting values at the upstream stand on the edge drop at downstream stand. These intensive calculations have to be performed by an accurate numerical model with a high cost/effective ratio. Based on the metal transverse flow theory at the edge drop zone, a numerical model was built in this study, in which the lateral flow was treated as a pure shear increment inside the rolling region, so that building a stiffness matrix in the lateral direction was not needed and modeling cost was saved. Additionally, inter-stand deformation was considered. Considering the proportional ratio of the strip was broken by the tapered work roll shifting, the longitudinal strain at the strip edge was considerably lower than the strain at the center, which leaded to shrinking and thinning near the edge. It was proved that the coupled model can provide results, which were obtained through industrial experiments, with higher accuracy compared with the original one. Successive calculations of two stands were conducted to reveal the control effectiveness of different tapered work roll shifting values at upstream stand on the downstream stand. It has been observed that the edge drop control region is the widest at the 1st stand, and its width successively reduces at the 2nd and 3rd stands. Based on this rule, a control strategy based on a three-point measure instead of a single point was proposed, and it was proved to be more effective than the one-point measure used in industrial applications.
- strip rolling,
- preset,
- transverse flow,
- inter-stand post-rolling yielding,
- edge drop automatic control

FullText(HTML)

References(15)

References

[1]	胡強, 王曉晨, 楊荃. 六輥冷連軋機邊降自動控制系統設計及應用. 冶金自動化, 2016, 40(1):34 doi: 10.3969/j.issn.1000-7059.2016.01.008 Hu Q, Wang X C, Yang Q. Design and application of automatic edge drop control system for 6-high tandem cold rolling mill. Metall Ind Autom, 2016, 40(1): 34 doi: 10.3969/j.issn.1000-7059.2016.01.008
[2]	張巖, 高健, 吳鯤魁, 等. 單錐度輥冷軋機邊部減薄控制應用研究. 冶金自動化, 2016, 40(1):45 doi: 10.3969/j.issn.1000-7059.2016.01.010 Zhang Y, Gao J, Wu K K, et al. Application research for edge drop control on cold mill of single taper roll. Metall Ind Autom, 2016, 40(1): 45 doi: 10.3969/j.issn.1000-7059.2016.01.010
[3]	Cao J G, Chai X T, Li Y L, et al. Integrated design of roll contours for strip edge drop and crown control in tandem cold rolling mills. J Mater Process Technol, 2018, 252: 432 doi: 10.1016/j.jmatprotec.2017.09.038
[4]	Lee J S, Shin T J, Yoon S J, et al. Prediction of steady-state strip profile in flat rolling. Steel Res Int, 2016, 87(7): 930 doi: 10.1002/srin.201600032
[5]	Pawelski O, Teutsch H. A mathematical model for computing the distribution of loads and thickness in the width direction of a strip rolled in four-high cold-rolling mills. Eng Fract Mech, 1985, 21(4): 853 doi: 10.1016/0013-7944(85)90092-X
[6]	Jiang Z Y, Wei D, Tieu A K. Analysis of cold rolling of ultra-thin strip. J Mater Process Technol, 2009, 209(9): 4584 doi: 10.1016/j.jmatprotec.2008.10.035
[7]	孫文權, 楊荃, 邵健, 等. UCM冷連軋機硅鋼邊降控制技術. 北京科技大學學報, 2010, 32(10):1340 Sun W Q, Yang Q, Shao J, et al. Edge drop control technique of silicon steel for UCM tandem cold rolling mills. J Univ Sci Technol Beijing, 2010, 32(10): 1340
[8]	Ma X B, Wang D C, Liu H M. Coupling mechanism of control on strip profile and flatness in single stand universal crown reversible rolling mill. Steel Res Int, 2017, 88(9): 1600495 doi: 10.1002/srin.201600495
[9]	Wang X C, Yang Q, Jiang Z Y, et al. Research on the improvement effect of high tension on flatness deviation in cold strip rolling. Steel Res Int, 2015, 85(11): 1560
[10]	連家創, 段振勇, 葉星. 三維解析法求解輥縫中金屬橫向流動問題. 燕山大學學報, 1984(3):1 Lian J C, Duan Z Y, Ye X. Study of rolling region metal transverse flow by 3 dimensional analytical method. J Yanshan Univ, 1984(3): 1
[11]	Le H R, Sutcliffe M P F. A robust model for rolling of thin strip and foil. Int J Mech Sci, 2001, 43(6): 1405 doi: 10.1016/S0020-7403(00)00092-8
[12]	Feng X W, Wang X C, Sun J Q, et al. Analysis of tapered work roll shifting technique in 5-stand UCMW tandem cold rolling process [J/OL]. Australian Journal of Mechanical Engineering (2019-04-23) [2019-06-01]. https://doi.org/10.1080/14484846.2019.1606762
[13]	管健龍, 何安瑞, 孫文權. 薄鋁帶軋制工作輥邊部接觸的建模與仿真. 東北大學學報: 自然科學版, 2015, 36(7):942 Guan J L, He A R, Sun W Q. Modeling and simulation of thin aluminum cold rolling with work roll edge contact. J Northeast Univ Nat Sci, 2015, 36(7): 942
[14]	劉立文, 張樹堂, 武志平. 張力對冷軋板帶變形的影響. 鋼鐵, 2000, 35(4):37 doi: 10.3321/j.issn:0449-749X.2000.04.010 Liu L W, Zhang S T, Wu Z P. Influence of tension on the deformation of strip during cold rolling. Iron Steel, 2000, 35(4): 37 doi: 10.3321/j.issn:0449-749X.2000.04.010
[15]	Hacquin A, Montmitonnet P, Guillerault J P. A steady state thermo-elastoviscoplastic finite element model of rolling with coupled thermo-elastic roll deformation. J Mater Process Technol, 1996, 60(1-4): 109 doi: 10.1016/0924-0136(96)02315-1