公开(公告)号：US20170165729A1

公开(公告)日：2017-06-15

申请号：US15403420

申请日：2015-07-09

Applicant: SMS INNSE S.P.A.

Inventor： Fabio Giovanni Antonio LACAPRUCCIA ,  Ubaldo Paolo PROVINCIALI ,  Jacopo GRASSINO

IPC: B21B19/04 ,  B21B17/04

CPC classification number: B21B19/04 ,  B21B17/04

Abstract: The present invention relates to a compact plant 10 for rolling a seamless tube. The plant comprises a rotary piercer 20 which defines a rolling axis XPR and is designed to pierce a billet 11 pressed against a plug 22 mounted on a rod so as to obtain a pierced blank 12. The rod is connected to a thrust block 26 designed to oppose the axial thrust during piercing. The plant also comprises a longitudinal mill 30 which defines a rolling axis XLL and is designed to roll the pierced blank 12 on a mandrel 32 so as to obtain a semi-finished tube 13. The mandrel is connected to a retaining block 34 designed to impart to the mandrel a predetermined speed during rolling. In the plant 10 according to the invention the rolling axes XPR and XLL coincide. The invention also relates to a method for rolling a seamless tube.