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1750mm热轧带钢宽度拉窄分析与控制措施 总被引:1,自引:1,他引:0
分析了热轧带钢生产中带钢宽度拉窄的现象和原因,针对粗轧立辊侧压量过大、精轧机组AGC控制不稳定、以及活套套量不稳定等主要影响因素,提出了相应对策,使成品宽度精度达到97%以上. 相似文献
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在带钢热连轧生产中,不合理的立辊侧压量分配会导致立辊严重磨损和轧制不稳定。为了合理分配各道次立辊侧压量,根据现场数据回归得到轧件宽厚比与侧压量关系曲线,合理分配了立辊各道次侧压量。根据曲线和目标中间坯宽度,采用牛顿迭代法,得到了立辊各道次合理的开口度,以此保持轧制稳定、准确控制中间坯宽度和减小立辊的磨损。结果表明,模型的中间坯宽度预报精度为±1.5 mm,达到98.7%;换规格第一卷预报精度为±3.0 mm,达到94.4%。在立辊一个换辊周期磨损量为2.8 mm。 相似文献
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分析了莱芜钢铁集团银山型钢有限公司板带厂1 500mm宽带线带钢宽度拉窄的特征和原因,针对粗轧区域、精轧区域及卷取区域造成的带钢宽度拉窄现象提出了相应改进措施,成品宽度精度得到显著提高。 相似文献
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宽度精度是热轧带钢成形过程的重要指标,准确预测精轧宽度有助于及时修正粗轧宽度设定模型,提高成品带钢的宽度精度。然而,依据轧制机理建立的宽度预测模型偏离实际工况从而精度较低,依据神经网络建立的模型由于过程黑箱导致可信度低。为此,提出了一种融合轧制机理和人工神经网络的热轧带钢精轧宽度组合预测模型,以基于Hill公式的机理模型计算精轧宽度的预测基准值,以基于深度置信网络(DBN)的深度学习模型预测精轧宽度的修正值。选取实际生产的2 730组数据中的49个特征值作为试验数据进行建模分析,结果表明:该组合模型预测精度高、稳定性好且预测时间短,其均方根误差为0.428 15 mm,相比机理模型降低了79.6%,相比神经网络模型降低了6.2%,实现了精轧宽度的高精度预测。 相似文献
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针对首钢京唐钢铁联合有限责任公司2250mm热轧生产线出现的管线钢头尾宽度偏窄、展宽轧制时宽度控制效果不好、立辊短行程参数维护繁琐效率低等问题,采取了将板坯上下表面温差控制在30℃以内、避免叩头板坯在定宽机处出现打滑、优化定宽机与立辊负荷分配、严格控制来料板坯宽度、开发新的立辊短行程维护工具等改进措施,取得了很好的效果。 相似文献
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Jian-guo Cao Si-jia LiuJie Zhang Ping SongTan-li Yan Yi-zhong Zhou 《Journal of Materials Processing Technology》2011,211(11):1768-1775
In order to meet the requirement of schedule-free rolling (SFR) for wide non-oriented electrical steel production with a large number of the same width strip rolling campaigns, ASR (asymmetry self-compensating work rolls) shifting strategies for different rolling schedules are studied. According to the actual rolling process, the work roll wear prediction mathematical model for non-oriented electrical steel sheets and a 3D finite element model for roll stacks are established. The effects of the shifting step and the shifting rhythm on the ASR wear contour and the loaded roll gap profile within the entire rolling campaign are analyzed. The reasonable ASR shifting strategies for different rolling schedules are developed. In comparison with the conventional work roll contour of K-WRS mill, the self-maintenances of roll contours for ASR reach to more than 88%, the rate of the measured strip crown less than 45 μm increased from 41.8% to 94.9%, and the rate of the measured strip crown larger than 52 μm decreased from 32.6% to 2.0% by industrial test on the production of the same strip-width for wide non-oriented electrical steel sheets in the 1700 mm hot strip mill of WISCO. The ASR technology has applied to the production successfully. 相似文献
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Simulation of vertical-horizontal rolling process during width reduction by full three-dimensional rigid-plastic finite element method 总被引:12,自引:0,他引:12
S. Xiong X. Liu G. Wang W. Zhang 《Journal of Materials Engineering and Performance》1997,6(6):757-765
Vertical-horizontal (V-H) rolling is an important process during width reduction in the roughing stand of hot strip mill.
A simulation of steady-state V-H rolling was carried out by the full three-dimensional rigid-plastic finite element method
(3D RPFEM). To consider the shear work rate and cope with a singular point, an extremely thin array of elements was attached
before the entry of the roll. The slab shape, the spread, the separating force, and the rolling torque calculated were in
good agreement with the experimental values. 相似文献