中文摘要：

以某厂φ150 mm大棒材连轧机组为对象，将大规格连铸坯芯部疏松视为体积可压缩材料，利用刚塑性有限元方法，建立了非均质大棒材轧制过程三维热力耦合非线性有限元模型，采用数值模拟方法研究了机架间张力对疏松缺陷致密压实的影响规律。结果表明，采用负张力轧制比自由轧制或微张力轧制能更有效地压实芯部疏松缺陷。从各道次孔型充满度和出口断面形状、轧制力能参数等方面探讨了实施负张力轧制工艺的可行性。

英文摘要：

Aiming at aφ150mm large section bar continuous rolling line,considering the porous de-fects in the large scale continuous casting billet as compressible material,a three-dimensional thermal-deformation coupled finite element model was established for heterogeneous large section bar rolling process with the rigid-plastic FEM.The influences of rolling tension on the porous compaction were investigated by numerical simulation.The simulation results show that the porous defects can be com-pacted better under negative tension rolling than that under zero tension and positive tension rolling. The spread and deformation are satisfactory in all the 9 passes,there is no defect appeared during the rolling process,and the final shape and dimension meet the requirements of bar production.The rolling force and torque was presented to evaluate the feasibility of this new rolling technology.