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

Addressing the control of the pierced billet dimensional accuracy 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 relationship between the mandrel retained-speed and the pierced billet dimensional accuracy and the mandrel axial force.The study result 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 the pierced 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.