Width setting on a finishing train

Patent metadata

Field	Value
Publication number	US-11318511-B2
Application number	US-202016783242-A
Country	US
Kind code	B2
Filing date	Feb 6, 2020
Priority date	Sep 17, 2014
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Before the rolling of a metal strip on a finishing train, the actual width and actual temperature of portions of the metal strip are respectively detected. The portions of the metal strip are tracked while they run through the finishing train. The rolling stands are respectively assigned width controlling devices which determine the setpoint width and the actual width after the rolling in the assigned rolling stand, and a downstream additional setpoint value, by which the desired tension downstream of the assigned rolling stand is corrected in order to bring the actual width closer to the setpoint width. The downstream additional setpoint value is both taken into account in the determination of the actual width and fed to a tension controller, which sets an actual tension, in the metal strip downstream of the assigned rolling stand, in accordance with the corrected setpoint tension. Determining the downstream additional setpoint value by the difference between the setpoint width and the actual width of a portion of the metal strip.

First claim

What is claimed is:

1. A finishing train for rolling a metal strip comprising:
multiple rolling stands through which a metal strip passes in succession; and
a control unit that virtually divides the metal strip into a plurality of sections and operates the finishing train,
1) to roll the metal strip in the finishing train;
2) to detect an actual width (b 0 ) and an actual temperature (T 0 ) of each of the sections of the metal strip before each section enters the finishing train;
3) to derive an actual width (b) from the detected actual width (b 0 ) for each section of the metal strip;
4) to derive an actual temperature (T) from the detected actual temperature (T 0 ) for each section of the metal strip;
5) to associate each derived actual width (b) with an initial target width (b 0 *);
6) to associate each derived actual temperature (T) with a target temperature (T*);
7) to path-track the sections of the metal strip during passage of the metal strip through the finishing train;
8) to associate a width control unit with each of the rolling stands, except the last rolling stand in the succession of the plurality of rolling stands;
9) to ascertain, with each width control unit that is associated with a rolling stand of the rolling stands, a target width (b*) of each section of the strip after said each section is rolled in the rolling stand associated with said each width control unit, and to associate the target width (b*) with said each section of the metal strip, the ascertaining being based on all of said initial target width (b 0 *) before the rolling in the rolling stand associated with said each width control unit, a target tension (Z 1 *) desired in the metal strip before a rolling in said rolling stand associated with said each width control unit, a target tension (Z 2 *) desired in the metal strip after the rolling stand associated with said each width control unit, the target temperature (T*) associated with said each section of the rolling strip and parameters (P) of the rolling procedure performed in the rolling stand associated with said each width control unit, said each target width (b*) ascertained by said each control unit after the rolling in the rolling stand associated with said each width control unit and associating the target width (b*) with said each section of the metal strip;
10) to ascertain, with said each width control unit, an actual width (b) for said each section of the metal strip after the rolling in the rolling stand associated with said each width control unit and to associate the actual width (b) with said each section of the metal strip on the basis of all of the actual width (b) of said each section of metal strip before the rolling in the rolling stand associated with said each width control unit, the target tension (Z 1 *) of the metal strip, which is corrected by an upstream additional target value (δZ 1 *), which is desired in the metal strip before the rolling stand associated with said each width control unit, correcting the target tension (Z 2 *) by a downstream additional target value (δZ 2 *), which is desired in the metal strip after said each rolling stand associated with said each width control unit, the actual temperature (T) associated with the section of the metal strip, and the parameters (P) of the rolling procedure performed in the rolling stand associated with said each width control unit;
11) to use said each width control unit to ascertain the downstream additional target value (δZ 2 *) on the basis of the target tension (Z 2 *) desired in the metal strip after the rolling stand associated with said each width control unit, the target temperature (T*) and the actual temperature (T) of said each section of the metal strip rolled in the rolling stand associated with said each width control unit, a difference (δb) between the target width (b*) and the actual width (b) of a section of the metal strip which is located at a predetermined point after the rolling stand associated with said each width control unit, and the parameters (P) of the rolling procedure;
12) to use said each width control unit to ascertain the downstream additional target value (δZ 2 *) such that the actual width (b) of the rolled section of the metal strip rolled in the rolling stand associated with said each width control unit approximates the target width (b*) of the rolled section; and
13) to use said each width control unit to supply the downstream additional target value (δZ 2 *) to an associated tension regulator, which sets an actual tension prevailing in the metal strip after the rolling stand associated with said each width control unit and the actual tension corresponds to the target tension (Z 2 *) corrected by the downstream additional target value (δZ 2 *).

2. The finishing train as claimed in claim 1 , wherein the actual widths (b 0 ) and the actual temperatures (T 0 ) are detected by a low pass filter.

3. The finishing train as claimed in claim 2 , wherein the low pass filter does not induce a phase offset in a filtered variable (bF, TF) in relation to an unfiltered variable (b 0 , T 0 ).

4. The finishing train as claimed in claim 3 , wherein the low pass filter is a symmetrical filter.

5. The finishing train as claimed in claim 1 , wherein the control unit predefines or ascertains the initial target width (b*) on the basis of the actual width (bF) associated with the sections of the metal strip.

6. The finishing train as claimed in claim 1 , wherein the control unit specifies the predetermined point.

7. The finishing train as claimed in claim 1 , wherein at least for a first to be passed rolling stand of the finishing train through which the metal strip passes first, the control unit detects a point in time (t 1 ), at which the metal strip enters the first to be passed rolling stand, and adapts the path-tracking on the basis of the detected point in time (t 0 ).

8. The finishing train as claimed in claim 1 , wherein the control unit specifies a final rolling temperature and uses the final rolling temperature as the target temperature (T*), or subjects the actual temperature (T) in a model-supported manner during the passage of the sections of the metal strip through the finishing train.

9. The finishing train as claimed in claim 1 , wherein the control unit uses a rolling force, a rolling torque, a strip velocity (v) on an inlet side, or an outlet side, or the inlet side and the outlet side, of an associated rolling stand, a rolling gap, a pass reduction, a compressed length of the metal strip, and material variables (M) of the metal strip as parameters (P) of the rolling procedure, with respect to the rolling stand associated with said each width control unit.

10. The finishing train as claimed in claim 1 , wherein the control unit tracks, with said each width control unit, the target width (b*) after the rolling as a function of spacing (a) from the downstream rolling stand, a strip velocity (v) after the rolling stand associated with said each width control unit, the desired target tension (Z 2 *) in the metal strip after the rolling stand associated with said each width control unit, the target temperature (T*), and material characteristic variables (M) of the metal strip; and
tracks, with said each width control unit, an actual width (bF) after the rolling as a function of the spacing (a) from the downstream rolling stand, the strip velocity (v) after the rolling stand associated with said each width control unit, the desired target tension (Z 2 *) in the metal strip after the rolling stand associated with said each width control unit corrected by the downstream additional target value (δZ 2 *), the actual temperature (T), and the material characteristic variables (M) of

Assignees

• Primetals Technologies Germany Gmbh

Inventors

• Kotzian Daniel
• Tautz Wilfried

Classifications

• B21B31/08

  Interchanging rolls, roll mountings, or stand frames {, e.g. using C-hooks; Replacing roll chocks on roll shafts} · CPC title

• B21B38/04

  for measuring thickness, width, diameter or other transverse dimensions of the product · CPC title

• B21B38/006

  for measuring temperature · CPC title

• B21B37/22 Primary

  Lateral spread control; Width control, e.g. by edge rolling · CPC title

• B21B37/48

  Tension control; Compression control · CPC title