大规格棒材粗轧过程数值模拟及表面缺陷分析

Simulation and Analysis of Surface Defect of Big Size Bar During Roughing Process

利用有限元软件MSC.MARC对南钢棒材厂大规格棒材热轧生产线粗轧过程进行有限元模拟,分析轧件粗轧后断面形状尺寸、温度、等效塑性应力应变和宽展情况,探讨轧件表面缺陷产生的原因及位置。模拟得出,粗轧过程中轧件变形的不深入及不均匀性导致最终产品在轧件圆断面45°角表面附近延长度方向容易产生缺陷。预测的轧件表面缺陷位置与现场实际缺陷位置吻合,验证了有限元模型的正确性,为现场实际生产和工艺优化提供了参考数据。

Roughing process of the big size bar which was produced in the hot-rolled production line of bar plant in Nanjing Iron and Steel was simulated with the f＇mite element software MSC.MARC. The possible causes and position of surface defect of the workpiece were studied by analyzing the simulation results of the section shape size, temperature, equivalent plastic stress, strain and the data of wide exhibition. Based on the results of the simulation, the impermeable and non-uniform of deformation for workpiece lead to the surface defect of final production occurrence near the 45°of circular cross section for workpiece and extending the direction of length. The simulation results of the surface defect locations of workpiece are in good agreement with the actual defect location, which verify the correctness of the finite element model and supply reference data for the actual production and process optimization.