Rolling mill with rolling dependent on material properties

Patent metadata

Field	Value
Publication number	US-11458518-B2
Application number	US-202117149799-A
Country	US
Kind code	B2
Filing date	Jan 15, 2021
Priority date	Jan 28, 2020
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

A rolling mill has a rolling stand (1) in which a flat rolled product (2) composed of metal is rolled. A sensor device (6), which detects at least one measured variable (M) characteristic of a material property of the flat rolled product (2), is arranged upstream and/or downstream of the rolling stand (1). The material property can be, in particular, an electromagnetic property or a mechanical property of the rolled product (2). The sensor device (6) transfers the detected measured variable (M) to a control device (9) for the rolling mill. Taking into account the measured variable (M), the control device (9) determines a control value (A) for the rolling stand (1). The control of the rolling stand (1) influences the material property of the flat rolled product (2). The control value (A) is a ratio of the peripheral speeds (vO, vU) at which the upper and the lower working rolls (3, 4) of the rolling stand (1) rotate.

First claim

The invention claimed is:

1. A rolling mill for rolling a flat rolled product composed of metal comprising:
a first rolling stand for rolling the flat rolled product having an upper working roll and a lower working roll;
a sensor device configured for detecting at least one measured variable (M) characteristic of a material property of the metal forming the flat rolled product, the sensor device being arranged upstream and/or downstream of the first rolling stand, the detected material property being a metal property irrespective of a current state of the rolled product and irrespective of geometrical properties of the rolled product;
a control device for the rolling mill to which the sensor device is connected in order to receive the detected measured variable (M);
the control device is configured to determine a control value (A) for the control of the first rolling stand based at least in part on the measured variable (M) received from the sensor device, the determined control value (A) being determined to control the first rolling stand to change the material property of the metal forming the flat rolled product to a desired material property; wherein
the determined control value (A) is a ratio of an upper peripheral speed (vO) at which the upper working roll rotates to a lower peripheral speed (vU) at which the lower working roll rotates.

2. The rolling mill as claimed in claim 1 , further comprising the rolling mill having at least one second rolling stand, wherein the second rolling stands are not arranged between the sensor device and the first rolling stand, or wherein the rolling mill has at least one second rolling stand and wherein at least one of the second rolling stands is arranged between the sensor device and the first rolling stand.

3. The rolling mill as claimed in claim 1 , further comprising the control device is configured and operable such that the control device determines the ratio of the upper peripheral speed (vO) to the lower peripheral speed (vU) and such that the ratio is between 0.5 and 2.0.

4. The rolling mill as claimed in claim 3 , further comprising an upper drive operable for driving the upper working roll and a lower drive operable for driving the lower working roll, wherein driving of the lower working roll is different from driving the upper drive.

5. The rolling mill as claimed in claim 1 , further comprising a common drive for driving the upper working roll and the lower working roll;
a transmission comprising an upper output shaft and a lower output shaft, the upper output shaft has a speed of an upper output shaft of the transmission, the upper output shaft which is connected for conjoint rotation to the upper working roll;
the transmission has a speed of a lower output shaft of the transmission, the lower output shaft being connected for conjoint rotation to the lower working roll, and the respective speeds of the upper and the lower output shafts can be continuously adjusted;
the transmission is arranged between a common drive on one side and the upper working roll and the lower working roll on another side.

6. The rolling mill as claimed in claim 1 , further comprising the control device is configured and operable such that the control value (A) determined by taking into account the measured variable (M) is a temperature modification of the upper working roll and/or of the lower working roll of the first rolling stand and/or of the flat rolled product before rolling in the first rolling stand.

7. The rolling mill as claimed in claim 1 , further comprising the sensor device is arranged upstream, in a path of the flat rolled product, of the first rolling stand;
the control device is configured and operable such that the control device outputs the control value (A) to the first rolling stand, and the control value (A) is determined taking into account the measured variable (M), which takes into account tracking of the flat rolled product from the sensor device to the first rolling stand.

8. The rolling mill as claimed in claim 7 , further comprising the control device comprises a model by which the control device determines the control value (A) for the first rolling stand wherein the model takes into account the measured variable (M), and, takes into account the control value (A), determined taking into account the measured variable (M), and the model furthermore determines an expected value (E) for the material property of the flat rolled product after rolling in the first rolling stand;
a further sensor device, by which at least one further measured variable (M′) characteristic of the material property of the flat rolled product can be detected after rolling in the first rolling stand, and the further sensor device is arranged downstream of the first rolling stand, and the further sensor device is connected to the control device to transfer the detected further measured variable (M′);
the control device is configured and operable such that the control device uses the further measured variable (M′) for a point in time which the control device determines taking into account tracking of the flat rolled product from the first rolling stand to the further sensor device; and
the control device is configured and operable to adapt the model based on a comparison of the further measured variable (M′) and the expected value (E) of the material property.

9. The rolling mill as claimed in claim 8 , further comprising the control device is configured and operable such that, in determining the control value (A), the control device takes into account the temperature (T) of the flat rolled product before the rolling of the flat rolled product in the first rolling stand and/or the rolling force (F) during the rolling of the flat rolled product in the first rolling stand and/or the pass reduction during the rolling of the flat rolled product in the first rolling stand in addition to the transferred measured variable (M).

10. The rolling mill as claimed in, claim 1 , further comprising the sensor device comprises an excitation element and a first sensor element, the excitation element is configured and operable for exciting a base signal in the flat rolled product;
a first sensor signal (Ia) based on the excited base signal is detected by the first sensor element; and
the sensor device is configured and operable for determining the transferred measured variable (M), taking into account the first sensor signal (Ia), or wherein the transferred measured variable (M) comprises the first sensor signal (Ia).

11. The rolling mill as claimed in claim 10 , further comprising the sensor device additionally comprises a plurality of second sensor elements; wherein when viewed in the transport direction (x) from the first sensor element, the respective second sensor element is arranged upstream or downstream of the first sensor element and/or is laterally offset so that a respective second sensor signal (Ib to Id) based on the excited base signal and of the same kind as the first sensor signal (Ia) is detected by means of the respective second sensor element; and the sensor device is configured and operable to determine the transferred measured variable (M) while also taking into account the respective second sensor signal (Ib to Id), or wherein the transferred measured variable (M) also comprises the respective second sensor signal (Ib to Id).

12. The rolling mill as claimed in claim 10 , further comprising the base signal is an eddy current (IW) or a sound signal, or an ultrasound signal.

13. The rolling mill as claimed in claim 10 , further comprising a connecting line from the excitation element to the first sensor element running paralle

Assignees

• Primetals Technologies Germany Gmbh

Inventors

• Hofbauer Josef
• Matschullat Thomas

Classifications

• B21B2001/221

  by cold-rolling · CPC title

• B21B2275/05

  Speed difference between top and bottom rolls · CPC title

• B21B37/46 Primary

  Roll speed or drive motor control (B21B37/52, B21B37/60 take precedence) · CPC title

• B21B2265/24

  asymmetric rolling · CPC title

• B21B1/28 Primary

  by cold-rolling {, e.g. Steckel cold mill} · CPC title