US 12,459,019 B2
Rolling taking frequency behavior into account
Matthias Dressler, Erlangen (DE); Daniel Kotzian, Forchheim (DE); Martin Schönherr, Forchheim (DE); and Srdan Sekulic, Erlangen (DE)
Assigned to Primetals Technologies Germany GmbH, (DE)
Appl. No. 18/012,280
Filed by Primetals Technologies Germany GmbH, Erlangen (DE)
PCT Filed May 26, 2021, PCT No. PCT/EP2021/064020
§ 371(c)(1), (2) Date Dec. 22, 2022,
PCT Pub. No. WO2022/008133, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 20184420 (EP), filed on Jul. 7, 2020.
Prior Publication US 2023/0256489 A1, Aug. 17, 2023
Int. Cl. B21B 37/46 (2006.01); B21B 37/16 (2006.01); B21B 37/54 (2006.01); B21B 37/58 (2006.01); B21B 15/00 (2006.01)
CPC B21B 37/165 (2013.01) [B21B 37/46 (2013.01); B21B 37/54 (2013.01); B21B 37/58 (2013.01); B21B 2015/0064 (2013.01); B21B 2261/04 (2013.01); B21B 2271/02 (2013.01); B21B 2273/20 (2013.01); B21B 2275/04 (2013.01); B21B 2275/12 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An operating method for a rolling mill,
wherein a metal strip is fed to a rolling stand of the rolling mill at an entry speed (v) by a feeding device arranged upstream of the rolling stand,
wherein the metal strip is rolled in the rolling stand,
wherein a thickness value (d) for the thickness of the metal strip is detected in each case for successive portions of the metal strip by means of a measuring device arranged between the feeding device and the rolling stand,
wherein the detected thickness values (d) are fed to a control device of the rolling mill,
wherein the control device determines a respective provisional thickness deviation (δd) on the basis of the deviation of the respective thickness value (d) from a setpoint thickness (d*) for the respective portion of the metal strip,
wherein the control device determines final thickness deviations (δd′) on the basis of the provisional thickness deviations (δd),
wherein the control device determines a control value (A2, A3) for the rolling stand and/or the feeding device in each case for the portions of the metal strip and outputs the respective control value (A2, A3) to the rolling stand and/or the feeding device at the correct time,
wherein the control device is provided with an inverse model that describes an inverse frequency response of the rolling stand and/or the feeding device and/or the measuring device. and
wherein the control device determines the respective control value (A2, A3) on the basis of the final thickness deviation (δd′) of the respective portion of the metal strip and also the final thickness deviations (δd′) of a plurality of portions of the metal strip preceding and/or succeeding the respective portion of the metal strip, with the inverse model of the rolling stand and/or the feeding device and/or the measuring device.