公开(公告)号：US20170173650A1

公开(公告)日：2017-06-22

申请号：US15403601

申请日：2015-07-08

Applicant: SMS INNSE S.P.A.

Inventor： Fabio Giovanni Antonio LACAPRUCCIA ,  Ubaldo Paolo PROVINCIALI ,  Paolo MARIN

IPC: B21B19/04 ,  B21B17/04 ,  B21B25/02

CPC classification number: B21B19/04 ,  B21B17/04 ,  B21B23/00 ,  B21B25/02

Abstract: The present invention relates to a plant 10 for rolling a seamless tube. The plant comprises a rotary piercer 20 which 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 which is produced on the rod during piercing. The plant also comprises a longitudinal mill 30 which 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 according to the invention the thrust block 26 and the retaining block 34 are formed by a single thrust/retaining block 36. The invention also relates to a method for rolling a seamless tube.