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| Optimization of Crown Control for 2250mm Wide Strip Hot Rolling Production Line |
| WANG Xiao-dong1,LI Fei1,LI Ben-hai1,LI Bin2,WANG Qiu-na2,ZHANG Bao-hui2 |
（1. Shougang Research Institute of Technology, Beijing 100043, China
2. Qian’an Iron and Steel Company of Shougang Steel Corporation, Qian’an 064404, Hebei, China） |
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Abstract There happened unstable problems of crown control and even negative crowns during the early in the production for reaching design annual capability in 2250mm hot strip mill of Qian’an Iron and Steel Company of Shougang Group. Data analysis of actual production and meanwhile the temperature and profile measurements of work rolls were carried out in this production line. The reason for the crown control problem was that CVC work roll contour was more sensitive to thermal and wear profiles and the big thermal crowns on CVC work rolls because of low capability of work roll cooling system destroyed the control capability of CVC on crown and in the end leaded to strips with small or negative crowns. Production was interrupted and cost for construction was higher if work roll cooling system were revamped. In the end, roll contour design and optimization were taken into account to solve the problem mentioned before. CVC work roll contour was optimized and the crown control range of unloaded roll gap was changed from ［－0.7mm, 0.7mm］ to ［－1.2mm, 1.2mm］. Meanwhile for improving the contact condition between CVC work and back-up rolls, CVC back-up roll contour was designed and applied. The unstable problem of crown control was solved after the new CVC roll contour configuration was used in the 2250mm hot strip mill. The strip shape quality is improved and the shape control precision reaches to 93% above while the control precision before optimization is only 67%.
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Received: 13 June 2011
Published: 22 May 2012
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2012, Vol. 47 
