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在四辊卷板过程中,卷制工件的曲率主要取决于侧辊的位移量。以塑性弯曲理论为基础,对四辊连续滚弯过程中板材各阶段的变形情况进行了理论分析。根据卸载定理推导出双线性硬化模型板材的回弹曲率计算公式,建立了四辊连续滚弯侧辊位移的数学模型。利用ABAQUS有限元软件对四辊连续滚弯过程进行三维动态模拟,对仿真值和理论值进行了比较,分析了不同板厚下侧辊进给量、相对弯曲半径与成形曲率半径之间的关系。结果表明:有限元仿真误差较小,可以用来指导实践;随着侧辊进给量的增加,板厚对成形曲率半径的影响逐渐减小;成形曲率半径随着相对弯曲半径的增加基本呈线性关系变化。
In a four-roll coiling process, the curvature of the rolled workpiece depends mainly on the amount of displacement of the side rollers. Based on the plastic bending theory, the deformation of the plate during the four-roll continuous rolling process is analyzed theoretically. According to the unloading theorem, the formula of springback curvature of the bilinear hardening model is deduced, and the mathematical model of the roll displacement of the four-roll continuous rolling is established. The three-dimensional dynamic simulation of four-roll continuous rolling process was carried out by using ABAQUS finite element software. The simulation values and theoretical values were compared. The relationship between the feeding amount, relative bending radius and forming radius of curvature . The results show that the finite element simulation error is small and can be used to guide the practice. With the increase of the feed of the side roller, the influence of the plate thickness on the forming radius of curvature decreases. The forming radius of curvature increases with the relative bending radius Linear relationship changes.