US 11,745,235 B2
Method and device for controlling a stretch reducing rolling mill for wall thickness compensation
Alexander Gohr, Mönchengladbach (DE); and Peter Thieven, Aachen (DE)
Assigned to SMS group GmbH, Düsseldorf (DE)
Appl. No. 17/270,022
Filed by SMS group GmbH, Düsseldorf (DE)
PCT Filed Aug. 15, 2019, PCT No. PCT/EP2019/071975
§ 371(c)(1), (2) Date Feb. 21, 2021,
PCT Pub. No. WO2020/038832, PCT Pub. Date Feb. 27, 2020.
Claims priority of application No. 10 2018 214 002.2 (DE), filed on Aug. 20, 2018.
Prior Publication US 2021/0323039 A1, Oct. 21, 2021
Int. Cl. B21B 37/16 (2006.01); B21B 17/14 (2006.01); B21B 17/04 (2006.01); B21B 37/78 (2006.01); B21B 37/46 (2006.01); B21B 38/04 (2006.01)
CPC B21B 37/16 (2013.01) [B21B 17/14 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, comprising:
providing a stretch reducing rolling mill having a plurality of roll stands (7) arranged one behind the other in a conveying direction of a pipe (6) to be rolled;
determining, by a wall thickness measuring device (2-2, 9), a wall thickness progression (4) of the pipe (6) to be rolled prior to rolling;
continuously measuring a current longitudinal coordinate (lx) of the pipe (6) by a pipe position measuring device (8) arranged in front of the plurality of roll stands (7) in the conveying direction;
transmitting the measured values of the longitudinal coordinate (lx) of the pipe (6) to a control unit (1A, 1B); and
controlling, by the control unit (1A, 1B), respective rotational speeds of the plurality of roll stands (7) during the rolling of the pipe based on the determined wall thickness progression (4) and the transmitted measured values of the current longitudinal coordinate (lx) of the pipe, in order to compensate for wall thickness variations of the pipe.