双辊连续铸轧过程中轧制界面接触压力切块法建模与数值模拟  

Modeling of Rolling Pressure Using Slab-method and the Numerical Simulation During Twin-roll Continuous Roll Casting Process

作　　者：朱志华[1] 肖文锋[1] 李晓谦[1] 

机构地区：[1]中南大学机电工程学院

出　　处：《中国机械工程》2002年第13期1091-1095,共5页China Mechanical Engineering

摘　　要：铸轧区可分为冷却区、铸造区和轧制区 3个物理区。利用切块法分别推导出了铸造区与轧制区变形过程静力平衡微分方程。在温度分布线性假设的基础上建立了轧制区变形抗力的简化模型 ,并在铸造区变形抗力的模型中引入了固相百分数来表征固态金属对变形抗力的影响。对铸造区利用龙格 -库塔法对微分方程进行数值求解 ,而对轧制区则根据混合摩擦条件求出微分方程的解析解 ,从而建立了铸轧区轧制压力模型。利用该模型对轧制压力进行数值计算 ,计算结果与实测数据相吻合。Roll-casting process can be divided into three physical zones: cooling zone,casting zone and rolling zone. In this paper, the static equilibrium differential equations of casting zone and rolling zone during deforming process are deduced respectively using slab method. A simplified model of flow stress in rolling zone is established based on the linear hypothesis of temperature distribution, and solid fraction is introduced into the flow stress model to express the influence of solid metal on flow stress in casting zone. The equation in casting zone is numerically solved using Runge-Kutta method and the equation in rolling zone is analytically solved according to the mixed friction condition. Therefore the model of rolling pressure of roll casting process is established. The results of numerical calculation agree with experimental ones very well, this verifies the validity of these models. Numerical simulation is carried out further to investigate the influence of technological parameters on rolling pressure. Results of the investigation indicate the following facts:①Roll casting speed can increase with the thickness of the strip decreased under the condition of same inner and outer cooling capability of the roll;②The peak value of rolling pressure increases with the setback increased or thickness of strip and speed decreased;③Rolling pressure increases with the diameter of the roll increased, therefore the designed parameters of mechanical capabilities of the roll caster should be raised.

关 键 词：铸轧 轧制压力 切块法 建模 数值模拟 

分 类 号：TG331[金属学及工艺—金属压力加工] TG339