Transverse flow law of metals and its effect on the shape of a steel strip
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摘要: 采用有限元軟件ABAQUS建立熱軋金屬彈塑性變形模型研究金屬橫向流動，為了降低模型計算成本，在模型中引入平穩軋制過程中軋件幾何模型端面縱向位移沿橫向均布的假設.利用此模型仿真研究軋制過程中多個因素對于金屬橫向流動的影響規律以及相應金屬橫向流動對軋件板形造成的影響.研究結果表明，接觸界面摩擦狀態的改變對金屬橫向流動的影響可以忽略；寬帶鋼熱連軋生產中，在比例凸度不變的情況下，寬度的變化和平均前、后張應力介于實際生產范圍內的波動不會引起金屬橫向流動的變化以及進一步的軋件板形變化；金屬橫向流動隨壓下率變化，且使得壓下率增加時軋件對稱板形向中浪趨勢發展；金屬橫向流動隨對稱及非對稱板廓相似度變化，且金屬橫向流動的變化顯著削弱板廓相似度的改變對軋件板形的影響.為了滿足生產現場的在線控制，根據多組有限元模型計算結果建立快速金屬橫向流動非線性回歸模型，為軋件板形的準確調控奠定基礎.Abstract: The transverse flow law of metals is very important for calculating the shape of steel strips during hot rolling. A metal elastic-plastic deformation model was developed using a general finite element software, ABAQUS. The calculation cost can be significantly reduced by imposing the transverse uniformity of the longitudinal displacement of the strip at the end face during steady rolling. The effect of factors on the transverse flow of metals and the effect of the transverse flow of metals on the shape of steel strips were analyzed using the developed model. Simulation results show that the effect of the friction condition of the contact interface on transverse flow is negligible. Moreover, during hot tandem rolling of wide steel strips, under the condition of constant unit crown, the variation of the width of the steel strip and fluctuation range of the mean front and back tension stresses do not affect the transverse flow and shape of metals. Further, the transverse flow of metals varies with the reduction ratio, which results in a trend toward the middle wave of the strip shape with the increase in the reduction ratio. It also varies with the similarity of the symmetric and asymmetric profiles and significantly reduces the effect of the change of profile similarity on the shape of the steel strip. A metal transverse flow prediction model is developed via the multivariate nonlinear regression method for online control, which lays the necessary foundation for strip shape regulation during hot rolling.
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Key words:
- hot rolling /
- transverse flow /
- elastic-plastic finite element model /
- shape /
- prediction model
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參考文獻
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