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对60kg/m U71Mn重轨轧制全道次进行了三维热力耦合有限元模拟。轧辊建模时分别通过翻转和平移轧辊来实现轧件翻钢和侧向推钢过程;轧件的建模采用抽取中间截面网格拉伸的建模方法,既消除网格畸变的影响又使得前后数据得到继承。模拟结果表明:重轨轧制过程中存在严重的不均匀变形,铸坯横断面金属质点在轧制过程中沿轧制方向不同步;轨底部位金属沿轧制方向和轨底高度方向流动;轨腰部位金属沿轧制方向和宽度方向流动,其中心向轨底部位偏移;轨头金属沿轧制方向被延伸。人工打孔制造缺陷坯轧制试验的特征点位置变化与模拟结果吻合良好,验证了轧件在各道次的金属流变规律。所建立的金属在轧制过程中的位置对应关系可以为生产过程中轧制缺陷的溯源分析提供便利。
Three-dimensional thermal coupled finite element simulation of 60kg / m U71Mn heavy rail rolling was conducted. During the process of roll modeling, the process of turning the steel and rolling the steel side are achieved by turning and translating the rolls separately. The modeling of the rolling stock adopts the modeling method of extracting the middle cross-section mesh stretching, which not only eliminates the influence of grid distortion, Before and after the data is inherited. The simulation results show that there is serious inhomogeneous deformation in the process of heavy rail rolling. The cross section of the metal slab in the cross section of the slab is not synchronized along the rolling direction during the rolling process. The metal at the rail bottom flows along the rolling direction and the height of the rail bottom. The metal at the rail waist portion flows in the rolling direction and the width direction with its center offset toward the bottom of the rail. The metal of the rail head is extended in the rolling direction. The variation of the characteristic points of the artificial billet manufacturing defect blank rolling test is in good agreement with the simulation results, which verifies the rule of the metal rheology of the rolling stock at each pass. The established correspondence between the positions of the metals in the rolling process can facilitate the traceability analysis of the rolling defects in the production process.