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The hydraulic roll-bending device was studied, which was widely used in modern cold rolling mills to regulate the strip flatness.
The loaded roll gap crown mathematic model and the strip crown mathematic model of the reversing cold rolling process were
established, and the deformation model of roll stack system of the 6-high 1 250 mm high crown (HC) reversing cold rolling
mill was built by slit beam method. The simulation results show that, the quadratic component of strip crown decreases nearly
linearly with the increase of the work roll bending force, when the shifting value of intermediate roll is determined by the
rolling process. From the first pass to the fifth pass of reversing rolling process, the crown controllability of bending
force is gradually weakened. Base on analyzing the relationship among the main factors associated with roll-bending force
in reversing multi-pass rolling, such as strip width and rolling force, a preset mathematic model of bending force is developed
by genetic algorithm. The simulation data demonstrate that the relative deviation of flatness criterions in each rolling pass
is improved significantly and the mean relative deviation of all five passes is decreased from 25.1% to 1.7%. The model can
keep good shape in multi-pass reversing cold rolling process with the high prediction accuracy and can be used to guide the
production process. 相似文献
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冷连轧生产线多配备有1套或2套板形仪,用于板形的实时反馈控制以及板形质量的监测,各处所用板形仪的规格不尽相同。板形平坦度指标是表征冷轧带钢板形质量的重要参数,由板形控制系统根据板形仪检测结果自动提供,一般以IU(I-Unit)表示。为了更准确地表征带钢板形质量,分析了某冷轧常用板形控制系统中带钢平坦度的计算方法,并考虑板形仪传感器分布不均会对其平坦度计算结果造成的影响,在此基础上提出了利用线性插值构造间距均匀的横向伸长率分布模型的方法,对平坦度计算过程进行了修正,并以实际板形数据进行检验,结果表明修正后的板形平坦度计算方法不再依赖于板形仪传感器的布置方案,使得具有不同板形仪的冷轧生产线的板形质量更具可比性。 相似文献
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