共查询到19条相似文献,搜索用时 109 毫秒
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中厚板轧制过程的有限元仿真研究 总被引:1,自引:0,他引:1
本文采用了MSC MARC2005有限元分析软件包建立了中厚板轧制的有限元仿真模型,通过接触分析的方法对中厚板的轧制过程进行了三维模拟仿真,并对不同压下量轧件轧后变形及应力分布做了分析,结果表明与实际轧制参数基本一致。 相似文献
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针对热轧U型钢板桩(SY390BZ/%:0.23C、1.60Mn、0.44Si、0.18V,0.18Ti、0.05Nb)轧制过程中产生翘曲缺陷,采用有限元分析软件ABAQUS显式动力学算法,结合实验室试验测量参数,对钢板桩的精轧过程进行了仿真计算。在仿真计算的基础上,根据轧制平面内节点位移矢量分布情况,分析了轧件横向和纵向断面内金属流动规律。模拟结果显示轧件断面在孔型轧制的压下方向上存在零位移线,表明U型钢板桩轧制中坯料翼缘和锁口处在轧制压力方向上轧件内金属流动存在位移中性面,并伴有轧件锁口凸缘处金属流动过快,腹板处金属流动较慢而产生翘曲的现象。 相似文献
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An integrated mathematical model is proposed to predict the velocity field and strain distribution during multi-pass plate hot rolling. This model is a part of the mixed analytical-numerical method (ANM) aiming at prediction of deformation variables, temperature and microstructure evolution for plate hot rolling. First a velocity field with undetermined coefficients is developed according to the principle of volume constancy and characteristics of metal flow during rolling, and then it is solved by minimizing the total energy consumption rate. Meanwhile a thermal model coupling with the plastic deformation is exploited through series function solution to determine temperature distribution and calculate the flow stress. After that, strain rate field is calculated through geometric equations and strain field is derived by means of difference method. This model is employed in simulation of an industrial seven-pass plate hot rolling process. The velocity field result and strain field result are in good agreement with that from FEM simulation. Furthermore, the rolling force and temperature agree well with the measured ones. The comparisons verify the validity of the presented method. The calculation of temperature, strain and strain rate are helpful in predicting microstructure. Above all, the greatest advantage of the presented method is the high efficiency, it only takes 12 s to simulate a seven-pass schedule, so it is more efficient than other numerical methods such as FEM. 相似文献
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Using three-dimensional rigid-viscoplastic finite element method (FEM), a coupling multivariable numerical simulation model for steel plate rolling has been established based on the physical metallurgy microstructural evolution rule and experiential equations. The effects of reduction, deformation temperature, and rolling speed on the deformation parameters and microstructure in plate rolling were investigated using the model. After a typical rolling process of steel plate 16Mn is simulated, the strain, temperature, and microstructure distributions are presented, as well as the ferrite grain transformation during the period of cooling. By comparing the calculated ferrite grain sizes with measured ones, the model is validated. 相似文献
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特厚板厚度方向形变传递规律的仿真分析 总被引:1,自引:0,他引:1
基于Gleeble热压缩试验、有限元方法对一种HSLA钢特厚板轧制过程中厚度方向变形向心部传递的规律进行了仿真研究。首次从有限元角度定量揭示出特厚板生产中高温、低速、大压下量的轧制规范机理。仿真所用材料本构模型由Gleeble试验数据结合Arrhenius方程所构建,研究了轧制速度、压下量、轧制温度以及板坯厚度对特厚板厚度方向应变分布的影响规律。结果表明,轧制速度小于1 m/s时(平均应变速率小于 0.33 s-1),有利于变形向钢板心部传递,削弱截面效应;压下量越大,钢板等效应变越大,且厚度方向最大等效应变出现的位置向心部偏移;轧制温度对等效应变的分布影响不显著,但是高温轧制有利于减小轧机负荷;板坯越厚,变形分布不均匀性越显著。当板坯厚度为500 mm时,截面的最大、最小等效应变差达到0.2。生产中,在设备允许的情况下,建议特厚板的轧制采用高温、低速、大压下量规范。 相似文献
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不锈钢对冷板表面质量要求高,轧制过程中夹杂物是产生表面缺陷的主要原因之一。为了明确夹杂物对轧制过程表面缺陷的影响规律,通过中试模拟试验研究了热轧、退火和冷轧过程硬质镁铝尖晶石和低熔点硅酸盐2种典型夹杂物的变形特点,并采用数值模拟对冷轧过程夹杂物的变形机理进行了分析。结果表明,热轧过程高熔点的镁铝尖晶石不变形,低熔点的硅酸盐夹杂物在1 200~1 250℃热轧温度下为半熔融状态,具有良好的变形能力。硅酸盐夹杂物长宽比高、抗拉强度低,冷轧过程更容易断裂延伸,随着轧制的进行,断裂后夹杂物之间的距离逐渐增加,尺寸减小。相反,镁铝尖晶石不容易断裂、延伸,而且存在断裂延伸的临界尺寸,该临界尺寸随冷轧变形量的增加而减小。由于镁铝尖晶石容易造成不锈钢轧制缺陷,因此生产过程中应尽量避免其生成或控制其粒径。 相似文献
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从分析M2钢的热加工塑性入手,通过对M2钢最佳的轧制温度和变形量的理论分析,从钢板组织、性能的角度出发,阐述了选择并控制荒轧温度、精轧温度及终轧温度和精轧变形量对M2钢热轧板质量的影响,从而确定了该钢热轧板的轧制工艺。 相似文献