Φ200mm H11芯棒钢热连轧过程张力影响因素的有限元分析

Finite Element Analysis of Influence Parameters on Tension of Φ200 mm H11 Steel Round Bar for Mandrel during Hot Continuous Rolling

应用MSC.MARC三维热力耦合弹塑性大变形有限元法及其接触分析技术,仿真研究了Φ200mm H11芯棒钢热连轧过程。分析得出,降低末道次轧辊速度Vr,会增强道次间的堆钢程度;提高末道次轧辊转速Vr,会增强道次间的拉钢程度;可通过合理修正Vr值来改善堆、拉钢关系以及轧制负荷变化和轧材宽展量,以提高圆钢成品精度。提出大规格圆钢热连轧过程应采用微堆钢轧制技术,以保持轧制力、力矩稳定和满足轧材尺寸精度要求。

The hot continuous rolling process of φ200mm H11 steel round bar for mandrel has been simulated and studied by using MSC. MA.RC 3- dimensional thermo-meehanieal coupled elasto-plastie finite element method （FEM） and contact analysis technique. It is obtained by analysis that with decreasing last pass miler speed Vr the compression extent between passes increased; with increasing last pass miler speed Vr the tensile extent between passes increased; therefore it is available to modify the relation between compression and tensile, the rolling load change and the widening extent of rolling products by change Vr value in order to increase the product dimension precision. It is concluded that the light compression technology between passes shall be adopted during heavy round steel continuous rolling to keep the stability of rolling load and torque and guarantee the requirement of product dimension precision.