无缝钢管张力减径过程的有限元模型开发及应用  

Finite Element Model Development and Application on Stretch Reducing Process of Seamless Tube

作　　者：于辉[1,2] 杜凤山[1] 汪飞雪[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004 [2]攀钢集团研究院有限公司,成都611731

出　　处：《机械工程学报》2011年第22期74-79,共6页Journal of Mechanical Engineering

基　　金：河北省自然科学基金(E2010001161);中国博士后科学基金(20110490987)资助项目

摘　　要：为了研究热轧无缝钢管张力减径过程的金属变形,利用组元建模原理,把张力作为相邻机架之间的边界条件,使得张力减径过程分为机架上的轧制变形过程和机架之间的网格再生过程。建立高阶拟合函数来精确描述轧辊孔型曲面,应用摩擦元模型来模拟接触摩擦,并用正割模量法来求解非线性方程组,在上述理论基础上开发张力减径弹塑性有限元模型,利用该模型对某厂张力减径机组进行有限元建模分析。通过与实际轧制结果比较可知,模拟计算与实际轧制的产品断面形状接近,都呈现轻微内六方形状,且壁厚变化规律一致,几何尺寸与实测值吻合良好,表明所开发的钢管张力减径弹塑性有限元模型能够满足工程计算要求,为预测断面形状和终轧尺寸精度提供有效研究手段。The stretch reducing process is divided into the rolling deformation of the stand and the remeshing generation between the stands taking the tension between the adjacent stands as the boundary conditions by means of the group modeling principle in order to study the metal deformation of hot rolling seamless tube in the process of stretch reducing.A higher-order fitting function is established to accurately describe the roll pass surface.A friction element model is applied to simulate the contact friction.Furthermore,the nonlinear equations are solved with a secant modulus method.On the basis of above theories,a elastic-plastic finite element model of stretch reducing process is developed,which is used to establish a FE model and to simulate the metal deformation of the stretch reducing unit of some factory.Through comparison,the shape of the product section simulated is similar to that of the actual rolled product,which is a slight hexagon shape.Moreover,the variation of wall thickness is the same.The geometry simulated is agreed very well with that of the measured.These show that the developed elastic-plastic finite element model for tube stretch reducing process met the requirements of engineering calculation,which provided an effective research method for predicting the section shape and finishing size accuracy.

关 键 词：无缝钢管 有限元法 预测模型 正割模量 几何尺寸 

分 类 号：TG335[金属学及工艺—金属压力加工]