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本文基于大变形弹塑性原理,采用隐式静态有限元法分析了压下量和轧制温度对高强度钢Q500D板材热轧应变分布的影响,得到了在不同压下量和轧制温度下塑性应变的分布规律,并将计算结果与实际热轧试验所得的数据进行了比较,相当吻合,证明此种模拟方法对于制定轧制工艺具有一定的指导意义。 相似文献
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摘要: 热连轧板坯温度的连续、实时预报是提高带钢产品性能的关键,针对热连轧过程数据维度过高不利于快速、准确预测板坯温度的问题,提出一种基于随机森林 长短期记忆神经网络(RF LSTM)的板坯粗轧出口温度预测模型。首先,采用改进随机森林算法对特征变量进行选择,通过分析板坯粗轧出口温度的预测结果变化衡量特征的贡献度,进而构造反映过程数据特征与板坯温度的特征选择评价函数;其次,针对热连轧过程数据具有时间序列特性的特点,采用LSTM预测板坯粗轧出口温度;通过钢厂实际的热连轧过程数据特征选择实验验证和对比分析,结果表明:特征选择前后钢坯的温度预测平均绝对误差、均方根误差分别下降了0.21、0.25℃,预测相对误差在±30%以内的精度达到了99.07%。 相似文献
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Finite Element Simulation of Hot Strip Continuous Rolling Process Coupling Microstructural Evolution 总被引:2,自引:0,他引:2
Using the nonlinear rigid viscoplastic finite element method (FEM), a finite element simulation of the hot strip continuous rolling process was done, which completely integrates different phenomena such as the metallurgical behavior of the strip and the thermo mechanics in the strip based on the physical metallurgical microstructural evolution law. By combining with the process parameters of certain 2 050 mm hot strip rolling, an actual rolling process of low carbon steel SS400 was simulated using the FEM model. Based on the simulation results, the distributions of the strain field, the temperature field, and the microstructure were presented. Meanwhile, the simulated rolling force, temperature, and microstructure are in good agreement with the measured results. 相似文献
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轧制力是轧制过程中重要的技术参数之一。本文应用DEFORM-3D软件建立轧制模型,研究了轧制温度、轧辊转速和压下率对钢板轧制力的影响。随后通过比较第一道次模拟轧制力与钢厂实测轧制力,结果表明:在三种钢板材料中,DEFORM-3D软件模拟的轧制力均与钢厂实测轧制力较吻合,误差都在10%以内。该模拟为钢厂轧制工艺参数的制定提供了重要的参考价值。 相似文献
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板带轧制数学模型是实现自动控制的基础,高精度的数学模型是提升产品质量和市场竞争力的重要保障。在热连轧粗轧过程控制中,轧制力和宽展是关键参数,其模型精度不仅会影响粗轧轧制规程的设定,而且会影响最终热连轧带钢产品凸度。以矩形板坯热连轧粗轧过程为研究对象,针对轧制变形区建立了三维运动许可加权速度场,在此基础上充分考虑自然宽展效应,基于刚塑性材料的第一变分原理,采用可变上限积分法对塑性变形、剪切功率和摩擦功率进行积分获得变形区总功率泛函。利用Matlab优化工具箱对总功率泛函进行最小化,得到了轧制力、宽度分布的理论解。最后利用理论模型计算数据回归得到了板坯宽展及速度场中的加权系数模型。将基于所提出模型的轧制力和宽展预测值与现场实测值及部分有关学者所建立模型的预测值进行了对比,结果验证了所建立模型的准确性。研究得到的宽展模型和速度场加权系数表达式可以方便、灵活、快速地应用到粗轧现场中,为更高质量热连轧带钢产品的生产奠定了坚实基础。 相似文献
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根据热轧不锈钢工程设计中的经验总结并结合国内已建成的宽幅不锈钢生产厂的工艺设备情况,从轧线布置形式和主要设备技术性能方面分析了不锈钢热轧板带生产工艺及设备选型的主要特点,指出不锈钢热轧生产与碳钢生产在工艺设备选型方面的区别。认为采用R1+F1~F7的工艺布置方式,较为经济、实用。为保证生产过程中的温度控制和产品质量,宽幅不锈钢粗轧机轧制力宜选择在42 000 kN以上,主电机功率12 000 kW以上。中间坯保温方式宜采用热卷箱形式。精轧机组前应设置小立辊轧机对带坯进行边部轧制。 相似文献
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Using 3 D elastic plastic FEM, the cold strip rolling process in a 4 high mill was simulated. The elastic deformation of rolls, the plastic deformation of the strip, and the pressure between the work roll and the backup roll were taken into account. The distribution of rolling pressure along the strip width was obtained. Based on the simulation results, the peak value of rolling pressure and the location of the peak were analyzed under different rolling conditions. The effects of the roll bending force and the strip width on the distribution of rolling pressure along the width direction were determined. 相似文献
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An integrated process modelling system for simulating the microstructure evolution of Nb-microalloyed HSLA steel produced in CSP hot rolling process has been developed on the basis of the microstructure simulation and mechanical properties prediction technology. 3-D thermomechanical coupled finite element models for simulating hot strip rolling have been developed and the distribution of equivalent plastic strain through the thickness direction of the rolled material by CSP roiling was obtained. Thus the distribution of temperature, strain and strain rate through the thickness of the steel stocks, as well as the microstructure evolution during hot rolling of X60 line pipe steel strip has been investigated by using the developed integrated process modelling system. In addition, the determination and op-timization of controllable process parameters during CSP hot strip rolling for the Nb-microalloyed X60 line pipe steel have been implemented, and control strategies such as adopting larger pass reduction in the first stand, arranging ap-propriate pass interval times and proper rolling speed, to reduce or eliminate mixed grain microstructure of Nb micro-alloyed strip in CSP processing have been proposed. 相似文献