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| Prediction model of hot rolling force in heavy cylinder rolling |
| SUN Jian-liang，PENG Yan，ZHANG Yong-zhen，CHEN Su-wen，HAN Hui |
| （ National Engineering Research Center for Equipment and Technology of Cold Strip Rolling， Yanshan University，Qinhuangdao 066004， Hebei， China） |
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Abstract A prediction model of hot rolling force in heavy cylinder rolling was established. According to the geometric relationship of heavy cylinder and rolls in the rolling process，the geometric equation of asymmetric contact arc lengths of up roll and down roll were obtained. According to the field data and finite element method，the deformation equation of contact arc lengths of up roll and down roll was obtained. Based on the geometric equation and deformation equation，the contact arc lengths of up roll and down roll can be calculated. Because the ratio of contact arc length and average thickness is very small，the influence of cylinder outer end is bigger than that of the contact friction，based on field data and optimization algorithm，the stress influence coefficient of cylinder outer end was obtained. Further， the prediction model of hot rolling force in heavy cylinder rolling was established. Calculated results show that：The contact arc lengths of up roll and down roll are not equal， the contact arc length of up roll is bigger than that of down roll，the ratio of contact arc lengths of up roll and down roll is about 1.3，at the same time，the reduction of up roll is bigger than that of the down roll；Applied the model proposed in the heavy cylinder rolling，the error of calculated rolling force and measured rolling force is 9.2%，the calculation accuracy can meet the requirements of industrial application.
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Received: 17 December 2014
Published: 08 September 2015
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2015, Vol. 50 
