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| Research on problem of "pseudo-bad flatness" at tail of hot rolling strip |
| WANG Dong-cheng1,2, ZHANG Ya-lin1, XU Yang-huan1 |
1. National Engineering Research Center for Equipment and Technology of Cold Rolling Strip, Yanshan University,Qinhuangdao 066004, Hebei, China;
2. State Key Laboratory of Metastable Materials Science and Technology,Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract The head and tail of hot rolling strip are in the non-stationary rolling zone, which is prone to various size, shape and quality defects. In the process of rolling soft and thin strip, a kind of "pseudo-bad flatness" which have similar characteristics with middle wave often appears at the tail of strip, but its mechanism is completely different from that of bad flatness, so the conventional flatness control method cannot solve this problem. For this reason, the mechanism of the problem is analyzed firstly, and it is found that the reason of this phenomenon is the sudden shrinkage caused by the disappearance of tension in the moment of steel throwing. According to the above mechanism, the velocity matching relationship between F8 stand and coiler before steel throwing is optimized, which greatly improves the problem of "pseudo-bad flatness" at the tail of strip and avoids the scratch between strip surface and roller table.
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Received: 17 June 2020
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2020, Vol. 55 
