为使计算结果接近实际轧制中工作辊的热行为，根据工作辊旋转一周依次经历不同的换热条件，将工作辊圆周方向的坐标转换为时间坐标，施加相应的边界条件.通过对工作辊温度场的分析，得出距工作辊表面10～19 mm 的区域，温度缓慢增加，大...为使计算结果接近实际轧制中工作辊的热行为，根据工作辊旋转一周依次经历不同的换热条件，将工作辊圆周方向的坐标转换为时间坐标，施加相应的边界条件.通过对工作辊温度场的分析，得出距工作辊表面10～19 mm 的区域，温度缓慢增加，大于19 mm 的区域温度几乎不变；深度在2～10 mm 之间的区域，温度接近轴对称分布；只有1%左右的区域即距表面小于2 mm 的区域，温度变化剧烈，并且很快达到动态稳定.轧制速度对距工作辊表面深度大于2 mm 区域的温度影响很小；在轧制节奏小于0.5时，继续减小轧制节奏对工作辊温度的影响较小.展开更多
In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and r...In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.展开更多
文摘为使计算结果接近实际轧制中工作辊的热行为，根据工作辊旋转一周依次经历不同的换热条件，将工作辊圆周方向的坐标转换为时间坐标，施加相应的边界条件.通过对工作辊温度场的分析，得出距工作辊表面10～19 mm 的区域，温度缓慢增加，大于19 mm 的区域温度几乎不变；深度在2～10 mm 之间的区域，温度接近轴对称分布；只有1%左右的区域即距表面小于2 mm 的区域，温度变化剧烈，并且很快达到动态稳定.轧制速度对距工作辊表面深度大于2 mm 区域的温度影响很小；在轧制节奏小于0.5时，继续减小轧制节奏对工作辊温度的影响较小.
基金Project(51074051)supported by the National Natural Science Foundation of ChinaProject(N110307001)supported by the Fundamental Research Funds for the Central Universities,China
文摘In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.
