共查询到20条相似文献,搜索用时 31 毫秒
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首钢迁钢2250mm热连轧生产线在达产初期出现了带钢凸度控制稳定性差的问题,甚至出现负凸度现象。对此热轧生产线的生产数据进行了分析,同时对轧辊温度与辊形进行了实际测量。究其原因为CVC辊形对热凸度和磨损辊形较为敏感,工作辊冷却水能力不足引起的轧辊热凸度过大破坏了CVC辊形曲线的板形控制能力。由于改造轧辊冷却水系统费用较高,需要停产,为了解决凸度控制稳定性问题,采用了辊形优化设计的方法。对精轧机组的CVC工作辊辊形进行了优化,空载辊缝凸度调控范围从[-0.7mm,0.7mm]增大到[-1.2mm,12mm]。同时,为了改善CVC工作辊与支撑辊辊间接触状态,设计并应用了CVC支撑辊辊形。此CVC辊形配置解决了首钢迁钢2250mm热轧线凸度控制稳定性差的问题,板形控制精度由原来的67%提高到了93%以上。 相似文献
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GUO Zhongfeng LI Changsheng XU Jianzhong LIU Xianghua WANG Guodong 《钢铁研究学报(英文版)》2006,13(6):27-0
Thermal crown of roll is an important factor, which affects strip profile. It is necessary to analyze the temperature field and thermal crown of roll for hot strip mill. A new simplified finite element method (FEM) was used to analyze the temperature field and thermal crown of roll, and corresponding models were built according to the practical boundary conditions. Transient roll temperature field and thermal crown were simulated by ANSYS FEM software with considering transient thermal contact and complex boundary condition. Temperature and thermal crown variations on roll surface nodes were obtained. The thermal crown results of roll obtained by FEM simulation were in good agreement with the measured data, indicating that simplified FEM models and results were correct. 相似文献
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Jiankang Xing Yan Peng Jianliang Sun Caiyi Liu Silvia Barella Andrea Gruttadauria Marco Belfi Carlo Mapelli 《国际钢铁研究》2023,94(9):2300022
Flatness and surface quality are important quality indexes of strip steel, and roll wear will directly affect the product's flatness and surface quality. Online roll profile measurement technology can obtain the information of roll profile in real time, guide the optimization of roll change rhythm, and improve the flatness control ability of rolling mill and surface quality of strip product. However, the error caused by roll displacement, clearance, roll thermal crown, and other factors is usually the same order of magnitude as the roll shape or roll wear, or even one order of magnitude higher. So error compensation is the key to ensuring the accuracy of online roll profile measurement. Herein, the position measurement technology of the roll bearing block is considered in the online roll profile measurement, and the measurement error caused by the deviation of the roll axis is separated. The thermal crown model is established to separate the measurement errors caused by the thermal crown. The error compensation model of online roll profile measurement is established, and the simulation calculation is carried out. This error compensation method is of great significance to improve the accuracy of online roll profile measurement and realize the fine management of mill roll in service. 相似文献
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工作辊冷却及热凸度控制技术 总被引:1,自引:0,他引:1
良好的工作辊冷却及热凸度控制是降低工作辊消耗,控制板型,提高生产收得率的有效措施,通过控制冷却,可以改善工作辊冷却效果,防止工作辊出现严重热裂纹,减少工作辊磨损进而减少换辊次数,避免不良板形的产生,本文介绍了工作辊的温度模型,磨损模型及热凸度控制模型,并对国外两种类型的工作辊冷却及热凸度控制技术进行了分析。 相似文献
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���� ����ΰ 《钢铁研究学报》2015,27(11):43-47
In the steel strip cold rolling process, the thermal crown of rollers affects the transverse thick difference and the strip flatness. But it is difficult to be measured on line. Through the establishment of transverse thickness difference equation and thermal crown tracing analysis, the change rule of roll thermal crown hide in this mass of process data was found out, and was used to predict and compensate it online. This method was used in the 300 testing cold rolling mill, and compared with the traditional rolling process. The test results show that the prediction is reasonable, and the compensation is effective to level off transverse thick difference. 相似文献
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轧辊热膨胀对承载辊缝形状和带钢板形具有显著的影响,而准确预报轧制过程中轧辊热膨胀是板形控制中的难点之一。针对某热连轧生产线单辊期内热膨胀量与轧辊温度不收敛的问题,利用自主开发的与产线生产完全一致的板形模型分析测试系统对热凸度二级模型进行了仿真分析与研究,提出了一种有效提高工作辊热平衡收敛性的优化方法,并进行了生产应用。该优化方法的应用解决了该热轧产线单辊期内热平衡不收敛的问题,消除了轧辊温度计算值和实测值之间的偏差,不仅提高了模型的预报精度,也大幅提高了该产线轧制带钢的凸度控制精度。 相似文献
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铸轧辊辊套温度场及热辊型的数值模拟 总被引:2,自引:0,他引:2
介绍了求解铸轧辊辊套温度场所采用的有限差分法,即采用FTCS格式进行的二维轴对称坐标下的铸轧辊辊套瞬态导热分析;并在此基础上进行了相应热辊型的求解,所得结果对于优良板型的获得具有参考价值。 相似文献
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