数值模拟在棒材热轧过程及缺陷预测中的应用  

The application of numerical simulation on bar hot rolling and defects prediction

作　　者：许杨中[1] 金杰[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310032

出　　处：《浙江工业大学学报》2011年第3期308-311,共4页Journal of Zhejiang University of Technology

摘　　要：采用三维刚塑性有限元方法,耦合轧制过程的温度场和应力、应变场,利用DEFORM-3D有限元软件模拟了棒材的热轧过程.通过分析轧件表面不同位置点的等效应变和等效应力,得出轧件尾部的变形比头部更充分以及中部变形较头部和尾部更稳定的结论;通过对轧件温度场的分析,得出了棒材热轧制结束瞬间,沿着轧制方向,表面温度呈下降趋势的结论,此结论与轧制理论相吻合;最后,通过分析离散点的等效应变率、Y向应变率和等效应力,对棒材热轧过程中轧件表面易产生缺陷的位置进行了预测,模拟位置与实际位置基本吻合,体现了数值模拟方法对于轧钢生产的重要现实意义.Considering temprature field,stress field and strain field,the whole process of bar hot rolling is simulated using three-dimensional thermo-mechanical couple rigid-plastic finite element method（FEM） in the platform of DEFORM-3D.The equivalent strain of bar crosswise and lengthwise surface as well as temperature field at the end of hot rolling is analyzed and the deformation and temperature laws are obtained,which are all in good agreement with rolling theory.Finally through analysis of the equivalent strain rate,Y strain rate and equivalent stress of surface points,the position of defects is predicted during the bar hot rolling via numerical simulation.It is found that the simulated position of defects is the same as the actual position.Therefore the realistic significance of numerical simulation to steel rolling production are explained with an example concerning bar hot rolling.

关 键 词：刚塑性有限元法 DEFORM-3D 形变 缺陷预测 

分 类 号：TG335[金属学及工艺—金属压力加工]