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| Prediction and Prevention of “Heart-Shaped Coil” Defect on Cold Rolling Coil |
| BAI Zhen-hua1,SI Hong-xin1,ZHOU Qing-tian1,HE Gao1,2,LI Peng-cheng1,LI Zhong1 |
（1. National Engieering Research Center for Equipment and Technology of Cold Strip Rolling, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
2. Cold Rolling Mill, Baosteel, Shanghai 200431, China） |
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Abstract For the “heart-shaped coil” defect on the coil discharge and cooling process of cold rolling coil, fully combined with inner sleeve equipment and related technology characteristics in coiling process of cold rolling thin strip, the reasons of the “heart-shaped coil” were detailed analyzed. The new concept of coil instability factor was firstly introduced to represent the occurrence probability “heart-shaped coil”. From the view of statistics, the judgment condition of “heart-shaped coil” defect was given; a set of “heart-shaped coil” prediction technology was put forward. The practical “heart-shaped coil” management technology based on the equipment parameter optimization choice was developed, including “cold rolled steel coil ‘heart-shaped coil’ defect prediction and sleeve choose software”. The occurrence rate of the “heart-shaped coil” defect was decreased in cold rolled steel coil discharge volume and cooling process.
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Received: 18 December 2012
Published: 18 June 2013
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2013, Vol. 48 
