A thermal elastic-plastic finite-element analysis to roll-life prediction on the twin roll strip continuous casting process
A thermal elastic-plastic finite-element analysis to roll-life prediction on the twin roll strip continuous casting process
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DOI：
10.1007/s11663-997-0077-4
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发表时间：
1997-12
期刊：
影响因子：
--
通讯作者：
C. Kang;Y. D. Kim
中科院分区：
文献类型：
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作者：
C. Kang;Y. D. Kim
计算了双辊式薄带连铸过程中的轧制力和轧辊变形行为，以估算铸轧辊的热特性。为了计算轧制力，假设轧辊材料和铸造合金的流动应力和应变之间的关系是应变率和温度的函数，因为铸造材料的力学性能取决于温度。利用商用有限元分析软件，对某冷轧辊进行了三维热弹塑性分析，得到了轧辊的应力和塑性应变分布。利用作者提供的铸轧辊温度场数据对轧辊变形进行了估算。为此，建立了考虑热力和轧制力的轧辊寿命计算模型。利用热弹塑性分析结果计算了考虑热循环的轧辊寿命。在连铸机轧辊模型中，考虑和不考虑轧辊表面细小裂纹失效，提出了轧辊寿命与轧辊转数的关系。为了得到连铸机轧辊的塑性应变分布，通过温度变化的单轴拉伸试验，获得了含铜合金轧辊套的热机械性能。所提出的分析技术在连铸机轧辊设计中得到了改进。
The rolling force and roll deformation behavior in the twin-roll-type strip continuous casting process have been computed to estimate the thermal characteristics of a caster roll. To calculate the rolling force, the relationship between the flow stress and strain for a roll material and a casting alloy are assumed as a function of the strain rate and temperature, because the mechanical properties of casting materials depend on temperature. The three-dimensional (3-D) thermal elastic-plastic analysis of a cooling roll has also been carried out, to obtain roll stress and plastic strain distributions, with the commercial finite-element analysis package of ANSYS. Temperature field data for a caster roll, provided by the authors, were used to estimate the roll deformation. Therfore, numerical models considering the thermal and rolling forces have been developed to estimate the roll life. Roll life considering the thermal cycle is calculated using thermal elastic-plastic analysis results. The roll life is proposed in terms of roll revolution in the caster roll models with and without the fine crack failure on the roll surface. To obtain plastic strain distributions of the caster roll, thermomechanical properties of a roll sleeve with a copper alloy are obtained by a uniaxial tensile test for variation of temperature. The proposed analysis techniques have improved in caster roll design.