US 11,666,957 B2
Controlling a strip tension during the flexible rolling of metal strip
Andre Sondermann, Finnentrop (DE); Andre Feldmann, Olpe (DE); Alexander Eick, Plettenberg (DE); Harald Eichner, Hennef (DE); and Martin Böhmer, Finnentrop (DE)
Assigned to Muhr und Bender KG, Attendorn (DE)
Appl. No. 17/265,831
Filed by Muhr und Bender KG, Attendorn (DE)
PCT Filed Jul. 20, 2019, PCT No. PCT/EP2019/069604
§ 371(c)(1), (2) Date Feb. 4, 2021,
PCT Pub. No. WO2020/035261, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 18189152 (EP), filed on Aug. 15, 2018.
Prior Publication US 2021/0291244 A1, Sep. 23, 2021
Int. Cl. B21B 37/50 (2006.01); B21B 39/08 (2006.01)
CPC B21B 37/50 (2013.01) [B21B 39/084 (2013.01); B21B 2265/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for controlling a strip tension during flexible rolling of metal strip in a rolling mill with a dancer roll that is adjusted with a hydraulic drive, and further having a controllable valve arrangement disposed between a hydraulic pump and the hydraulic drive, and at least one hydraulic pressure accumulator arranged between the hydraulic pump and the valve arrangement, comprising the following steps:
measuring a hydraulic pressure at the hydraulic drive,
determining the strip tension in the metal strip based on the measured hydraulic pressure at the hydraulic drive;
controlling the valve arrangement depending on the determined strip tension of the metal strip,
storing hydraulic fluid in the at least one hydraulic pressure accumulator,
feeding, at least partially, the hydraulic fluid previously stored in the at least one hydraulic pressure accumulator to the hydraulic drive for a short-term supply of hydraulic fluid,
determining a position of the dancer roll of at least one strip guiding unit for coiling or uncoiling the metal strip, and
varying a speed of a reel of the at least one strip guiding unit depending on the position of the dancer roll.