芯棒限动速度对荒管尺寸精度影响的有限元研究

Finite Element Analysis of Effect on Pierced Billet Dimensional.Accuracy by Retained Mandrel Speed of MPM Pipe Mill

针对限动芯棒连轧管机组荒管尺寸精度控制问题,利用有限元分析软件MSC.SuperForm开展三维模拟,研究芯棒限动速度与荒管尺寸精度及芯棒轴向力的对应关系。研究结果表明:芯棒速度是影响孔型内金属不均匀变形和机架间张/推力的重要因素,提高芯棒速度,荒管尺寸精度和机架间张/推力水平明显改善,但增大了芯棒轴向力。实际生产中,选择芯棒速度时,要综合考虑芯棒轴向力与荒管尺寸精度。

Addressing the control of the pierced billet dimensional acc uracy of the tube as rolled by the retained mandrel mill,the FEA software MSC.SuperForm is adapted to develop 3-D simulation to study the corresponding relation-ship between the mandrel retained-speed and the pierced billet dimensional accuracy and the mandrel axial force.The studyresult reveals that the mandrel speed plays a critical role in affecting the in-groove uneven deformation of the metal and the stretch/push force between the rolling stands.Accordingly increasing the mandrel speed will remarkably improve thepierced billet dimensional accuracy and the stretch/push force between the stands,whereas the mandrel axial force will be increased along too.In case of the workshop operation,the mandrel speed should be determined based on a proper balance between the mandrel axial force and the pierced billet dimensional accuracy.