EP4577361A1 - Verfahren, computerprogrammprodukt und kaltwalzgerüst zum kaltwalzen eines metallbandes - Google Patents
Verfahren, computerprogrammprodukt und kaltwalzgerüst zum kaltwalzen eines metallbandesInfo
- Publication number
- EP4577361A1 EP4577361A1 EP23757221.9A EP23757221A EP4577361A1 EP 4577361 A1 EP4577361 A1 EP 4577361A1 EP 23757221 A EP23757221 A EP 23757221A EP 4577361 A1 EP4577361 A1 EP 4577361A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- work roll
- temperature
- cold rolling
- cooling device
- rolling stand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/12—Roll temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B27/106—Heating the rolls
Definitions
- the invention relates to a method and a computer program product for operating a cold rolling stand of a work roll for cold rolling a metal strip and with at least one inductive heating device extending in the longitudinal direction of the work roll for heating the surface of the work roll.
- the invention relates to a corresponding cold rolling stand for carrying out the method according to the invention.
- Such a process and cold rolling stand are basically known in the prior art, for example: B. from European patent application EP 1 336 437 A1.
- This patent application discloses a roll stand with a work roll for rolling metal strip.
- the work roll is assigned at least one inductive heating device extending in the longitudinal direction of the work roll for heating the surface of the work roll.
- a calculation device determines a heat requirement for the areas of the work rolls near the strip edges and a control device is available for controlling the inductive heating device in accordance with the calculated or predetermined heat requirement. This ensures that the work rolls expand thermally homogeneously beyond the strip edge and that the roll gap of the roll stand remains constant even in the area of the strip edges. In this way, the flatness of the metal strip to be rolled is promoted.
- the heat requirement is predetermined through at least partially continuous process simulation.
- the process simulation can include the energy flows between the metal strip to be rolled and the work rolls when calculating the heat requirement.
- the forming work done during rolling, the frictional heat generated and the Heat conduction from the metal strip to the work rolls and vice versa must be taken into account.
- This known technical teaching has the disadvantage that it is not suitable for calculating the heat requirement if the work roll is assigned a multi-zone cooling device for setting a desired temperature distribution on the surface of the work roll.
- the invention is based on the object of developing a known method and computer program product as well as a known cold rolling stand with an associated multi-zone cooling device for cold rolling a metal strip in such a way that the multi-zone cooling device can be operated optimally.
- the method has the following steps: a) determining the current temperature of the surface of the work roll; b) calculating the temperature difference between the working temperature of the surface of the work roll required by a multi-zone cooling device and its current surface temperature; c) calculating a required amount of heat energy that must be supplied to the work roll in at least one operating mode of the cold rolling stand in accordance with the temperature difference in order to warm up the surface of the work roll to the working temperature for the multi-zone cooling device; d) activating the inductive heating device with the control device in accordance with the calculated amount of thermal energy and heating the surface of the work roll to the working temperature; and e) setting a desired temperature distribution on the surface of the work roll in the longitudinal direction of the work roll using the Multi-zone cooling device by cooling the surface zone by zone after the surface of the work roll has previously been warmed up to at least the working temperature required by the multi-zone cooling device.
- the method according to the invention advantageously ensures that the surface of the work roll is heated in at least one operating mode of the cold rolling stand to the working temperature that the multi-zone cooling device at least requires for its proper operation.
- This enables proper operation of the multi-zone cooling device and thus the setting of a predetermined temperature distribution on the surface of the work roll by cooling the surface of the work roll in zones.
- the predetermined temperature distribution for the surface of the work roll is selected in particular so that the roll gap of the cold rolling stand has a desired roll gap profile, e.g. B. has a constant height so that the metal strips can be rolled with good flatness.
- the term length in relation to the work roll, the body of the work roll and the roll gap refers to the longitudinal direction, i.e. to the axial direction of the work roll.
- the method according to the invention enables the said good flatness even in metal strips whose rolling required only little forming work and therefore only little Forming heat was created and could be transferred to the surface of the work roll.
- the missing heat to achieve the required working temperature for the multi-zone cooling device is specifically calculated according to the method according to the invention and supplied with the help of the inductive heating device. In this way, thermal losses can also occur arising during production breaks must be compensated for.
- the inductive heating device can be arranged inside and/or outside the work roll.
- Figure 1 shows a cold rolling stand according to the present invention.
- the cold rolling stand 100 shows two work rolls 110, which face each other and span a roll gap.
- the metal strip 20 to be rolled is guided through this roll gap and rolled, in particular also reduced in thickness.
- At least one of the work rolls 110 is assigned an inductive heating device 120, which extends in the longitudinal direction of the work roll, for heating the surface of the work roll.
- a calculation device 130 is provided for calculating the amount of thermal energy that must be supplied to the work roll 110 in a respective operating mode of the cold rolling stand 100 and finally a control device 140 is provided for controlling the inductive heating device in accordance with the calculated amount of thermal energy for heating the surface of the work roll.
- the calculated amount of heat energy corresponds to the heat requirement that is delivered to the surface of the Work roll must be fed in order to heat it to a predetermined temperature.
- the calculation device 130 is designed according to the present invention to calculate the required amount of heat energy in accordance with the temperature difference between a current surface temperature of the work roll and the predetermined working temperature for the multi-zone cooling device 150.
- the control device 140 controls the inductive heating device 120 according to the present invention in accordance with the requirements the calculated heat requirement for heating the surface of the work roll to the working temperature for the multi-zone cooling device 150.
- the at least one inductive heating device 120 is preferably formed in the form of a line inductor.
- the at least one line inductor can be one Zone division for zone-wise heating of the surface of the work roll over its entire length or not.
- the separately controllable zones of the corresponding line inductor advantageously enable targeted generation of a thermal bale in the range of intermediate coil times, preparation for a change in width of the metal strip to be rolled, support of flatness control when rolling the metal strip and / or when rolling metal strips of different quality and different material , e.g. B. when rolling silicon metal strip.
- the calculation device 130 is preferably designed to specify or output the intensity and/or duration of the heating of the surface of the work roll to the control device 140 based on rules and/or based on mass data.
- bulk data here means data that could be collected in the past when heating the surface of work rolls.
- the calculation results of the calculation device 130 can be made more precise in this way. The precise specifications of the calculation device are particularly helpful in the “rolling” operating mode and/or in intermediate coil phases.
- intermediate coil phases means the time between the end of a previous winding process for a first metal strip and the start of winding for a subsequent second metal strip.
- the cold rolling stand 100 can be a single stand, can be a stand in a (tandem) cold rolling mill or can be a reversing roll stand.
- the control device 140 is designed to switch off the inductive heating device 120 when the current surface temperature of the work roll is greater than the working temperature of the surface of the work roll required by the multi-zone cooling device 150.
- the method according to the invention provides that the current temperature of the surface of the work roll is first determined.
- the current temperature of the surface of the work roll is typically the ambient temperature in the vicinity of the work roll, for example room temperature.
- the steps of the method according to the invention must then be carried out with the ambient temperature as the current temperature.
- the temperature of the surface of the work roll is then raised in a start-up mode to the working temperature for the multi-zone cooling device.
- the start-up mode always comes into consideration for the cold rolling stand 100 when the rolling stand needs to be started up again. This may be necessary, for example, after a roll change, after downtimes or after changing the metal strip to be rolled, for example to a different width.
- the method according to the invention After determining the current temperature, the method according to the invention provides in step b) that a temperature difference is calculated between a working temperature of the surface of the work roll 110, which the multi-zone cooling device 150 requires for its proper operation, and the previously determined current surface temperature. From this temperature difference, the required amount of thermal energy that must be supplied to the work roll 110 in at least one operating mode of the cold rolling stand 100 is then calculated in a method step c). To warm up the surface of the work roll 110 to the working temperature for the multi-zone cooling device 150.
- the method according to the invention provides, in step d), to control the inductive heating device 120 with the control device 140 with the calculated amount of thermal energy and in this way to bring the surface of the work roll 110 to the working temperature for the multi-zone cooling device 150 to heat up.
- the inductive heating device 120 can be switched off when the current surface temperature of the work roll 110 has reached a predetermined upper temperature limit, which is above or equal to the minimum working temperature of the surface of the work roll required by the multi-zone cooling device 150.
- the inductive heating device 120 can be controlled in accordance with method step d) in the manner of a two-point control.
- the inductive heating device 120 is then switched on or remains switched on until the surface temperature of the work roll 110 has reached the specified upper temperature limit.
- the inductive heating device is then switched off and optionally only switched on again when the surface temperature of the work roll has fallen to a predetermined lower temperature limit.
- the lower temperature limit is advantageously below the working temperature.
- the heating of the surface of the work roll 110 according to step d) is advantageously carried out homogeneously in the longitudinal direction of the work roll.
- the entire surface of the work roll is then brought to a uniform working temperature.
- an ultimately desired temperature distribution of the work roll which is required to achieve a desired roll gap profile, is set solely by the multi-zone cooling device 150.
- a mixed operation is also conceivable, in which the ultimately desired temperature distribution in the work roll is achieved in part in process step d) by heating the surface of the work roll and in which another, remaining part is used to realize the desired temperature distribution in process steps e ) is realized by suitable cooling of the surface temperature of the work roll.
- the heating of the bale of the work roll 110 is preferably carried out beyond the width of the metal strip 20 to be rolled; it is particularly advantageous to heat the bale of the work roll over its entire length.
- the working temperature for the multi-zone cooling device 150 is, for example, approximately 100 ° C.
- This described suitable temperature control of the work roll 110 preferably takes place in the said start-up mode, before the start of an actual rolling operation of the cold rolling stand 100.
- This start-up operation offers the advantage that - unlike in the prior art - a lot of strip material does not have to be rolled under cold conditions first, so that the work roll heats up before the actual rolling operation due to the resulting forming work.
- the start-up mode described enables a quick start to production Rolling operations can begin immediately with the work roll at the correct temperature.
- This has the advantage that the metal strip can be rolled with good quality right from the start of the rolling operation. Thanks to the preheated work roll, the metal strip to be rolled comes to temperature more quickly; This is particularly desirable and advantageous for so-called “self-annealing” grades.
- the pre-tempered work roll allows more sellable strip material of good quality to be produced within one coil.
- Productivity can also be achieved through higher rolling speeds, which are possible due to the pre-heating of the work rolls during the start-up mode, for example after a roll change or after a longer system shutdown.
- targeted warm-up strategies during the start-up mode advantageously enable shorter secondary coil times and better quality of the rolled metal strip, e.g. B. after a product change, especially a change of metal strip with different widths.
- the cold rolling stand 100 is ready for rolling operation as a second operating mode.
- the metal strip 20 is cold rolled with the help of the work roll, with the surface of the work roll heating up to a forming temperature.
- steps a) to e) of the method according to the invention it is advisable to carry out steps a) to e) of the method according to the invention several times, if necessary, with the time-dependent forming temperature changing as the current surface temperature of the work roll.
- the determination of the forming temperature as the current surface temperature of the work roll during rolling operation is advantageously carried out with the aid of a physical model that simulates and calculates the temperature development on the surface of the work roll due to the forming work carried out during cold rolling.
- the multi-zone cooling device 150 typically functions as an actuator of a flatness control for the metal strip 20 to be rolled.
- the multi-zone cooling device 150 serves as such an actuator for setting the desired temperature distribution on the surface of the work roll by spraying the surface with a cooling medium.
- the operating temperature for the multi-zone cooling device 150 is typically above the temperature of the cooling medium.
- the heating of the work roll claimed according to the method according to the invention serves to increase the temperature difference between the surface temperature of the work roll 110 and the temperature of the cooling medium, in order in this way to increase the efficiency of the multi-zone cooling device as an actuator of the flatness control.
- the multi-zone cooling device 150 contributes to the improved flatness of the rolled metal strip, in particular by setting the resulting temperature distribution on the surface of the work roll as homogeneously as possible, because a constant roll gap profile results from the homogeneous temperature distribution.
- the flatness at the edge area of the metal strip to be rolled is improved in the present invention in that the homogenization of the working temperature on the surface of the work roll takes place not only in the area of the metal strip to be rolled, but also in the edge areas of the strip of the work roll 110, which is via the width of the metal strip to be rolled.
- the predetermined working temperature on the surface of the work roll is constant over time in the longitudinal direction of the work roll. This preferably applies to both the start-up mode and the rolling operation, especially if the metal strip 20 is rolled in a reversing manner.
- the predetermined working temperature in particular during rolling operation, can also be a temperature average value over time Variance depends on the rolling speed at which the rolled strip is cold rolled by the cold rolling stand 100. In this way, it can advantageously be achieved that the viscosity of a lubricating medium is influenced by a constant temperature throughout the entire rolling process in such a way that advantages in force constancy and in the flow interface position are achieved.
- the method according to the invention can be used on all types of metal strips, in particular on aluminum strip, steel strip or a metal strip made of a non-ferrous, non-ferrous metal.
- the method according to the invention can be repeated at time intervals or preferably continuously during the start-up mode and/or during the rolling operation.
- Each repetition of the method offers the advantageous possibility of updating the calculated temperature difference and the currently required heat input onto the surface of the work roll in order to warm it up to the working temperature for the multi-zone cooling device 150.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022208755 | 2022-08-24 | ||
| DE102023200055.5A DE102023200055A1 (de) | 2022-08-24 | 2023-01-04 | Verfahren, Computerprogrammprodukt und Kaltwalzgerüst zum Kaltwalzen eines Metallbandes |
| PCT/EP2023/072056 WO2024041892A1 (de) | 2022-08-24 | 2023-08-09 | Verfahren, computerprogrammprodukt und kaltwalzgerüst zum kaltwalzen eines metallbandes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4577361A1 true EP4577361A1 (de) | 2025-07-02 |
| EP4577361B1 EP4577361B1 (de) | 2026-04-01 |
Family
ID=87695872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23757221.9A Active EP4577361B1 (de) | 2022-08-24 | 2023-08-09 | Verfahren, computerprogrammprodukt und kaltwalzgerüst zum kaltwalzen eines metallbandes |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4577361B1 (de) |
| WO (1) | WO2024041892A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024126693A1 (de) * | 2024-09-17 | 2026-03-19 | Sms Group Gmbh | Walzenerwärmungsvorrichtung zum Vorwärmen von zumindest zwei Walzen, Walzanlage mit einer Walzenerwärmungsvorrichtung, Verfahren zum Vorwärmen von zumindest zwei Walzen |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63188408A (ja) * | 1987-01-28 | 1988-08-04 | Nippon Steel Corp | 板圧延機 |
| US5235835A (en) * | 1988-12-28 | 1993-08-17 | Furukawa Aluminum Co., Ltd | Method and apparatus for controlling flatness of strip in a rolling mill using fuzzy reasoning |
| DE10206758B4 (de) | 2002-02-19 | 2006-05-18 | Hydro Aluminium Deutschland Gmbh | Bandkanten-Planheitssteuerung |
| CN101384382A (zh) * | 2006-02-17 | 2009-03-11 | 美铝公司 | 在冷轧机中应用感应加热来控制薄板的平直度 |
-
2023
- 2023-08-09 EP EP23757221.9A patent/EP4577361B1/de active Active
- 2023-08-09 WO PCT/EP2023/072056 patent/WO2024041892A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024041892A1 (de) | 2024-02-29 |
| EP4577361B1 (de) | 2026-04-01 |
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