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采用MSC.Marc有限元模拟软件,针对200 mm×200 mm连铸方坯连轧Φ100 mm 42CrMo圆钢工艺过程进行三维热力耦合模拟仿真。因圆角在孔型中塑性应变较大且变形由表及里逐渐深入,因此对断面采用网格偏差划分方法以细分表层及圆角区域单元。根据连轧过程应力场、应变场和温度分布及轧制力和轧制力矩变化特点,得出合金钢轧制时圆角易出现裂纹的重要原因是该区域总等效塑性应变、等效应力和温降较大。机架间及轧后断面尺寸实测值与模拟值相符合。
The finite element simulation software MSC.Marc was used to simulate the three-dimensional thermal coupling process of Φ100 mm 42CrMo round bar with 200 mm × 200 mm continuous casting. Due to the fillet in the hole in the plastic strain is larger and the deformation gradually deepened from the table and, therefore, the section of the mesh deviation method to subdivision surface and fillet area unit. According to the change of stress field, strain field, temperature distribution, rolling force and rolling torque during rolling process, it is concluded that the main reason of the cracks in the fillet during rolling is the total equivalent plastic strain and equivalent stress And the temperature drop is bigger. Measured values of the cross-section between the stands and the rolling line are in accordance with the simulated values.