EP1173295B1 - Rolling process for a metal strip and corresponding rolling device - Google Patents

Abstract

The invention relates to a rolling process for a metal strip (1) having width (b), wherein the metal strip (1) is rolled in at least one rolling stand (2), wherein an amount of lubricant is applied and spread on the width (b) of the metal strip (1), wherein the lubrication process on the width (b) of the metal strip is detected behind the rolling stand (2) and used for regulating the amount and/or distribution of the lubricant (5) and/or at least one rolling parameter (v).

Description

The present invention relates to a rolling method for a metal strip, the Metal strip is rolled in at least one roll stand, with the metal strip, distributed over its width, a lot of lubricant is applied, as well as a corresponding roller arrangement. Such rolling processes and rolling arrangements are known for example from DE 2 927 769 A1.

Rolling processes are now highly developed. In order to produce flat rolled strips, for example, backup rolls are used, the work rolls are bent back, Intermediate rolls shifted, segment-wise cooled etc. Despite all of these However, the tape produced is not completely flat. Furthermore Sometimes there are stability problems with the strip running during rolling, to stability problems in the roll gap and / or to slip phenomena that in extreme cases, can even lead to a tape tear.

The object of the present invention is a rolling method and a to provide the corresponding roller arrangement by means of which even more reliable and planer belts can be produced.

The task is solved for the rolling process in that behind the rolling stand the temperature profile of the metal strip is determined over the metal strip width the temperature is measured by an infrared or a CCD camera the measured temperature is compared with a predetermined temperature: the place / places of the metal strip where the measured temperature is above the specified temperature, is / are determined and for adjustment the amount and / or distribution of the lubricant is used / become.

Corresponding to this is one in the rolling arrangement behind the scaffolding Infrared or CCD camera for measuring the temperature curve in the metal strip arranged using a regulator to adjust the amount and / or distribution of the lubricant is connected to the lubrication device.

The lubrication process can be determined directly or indirectly.

For example, the metal strip behind the roll stand has the width of the metal strip a temperature curve. This temperature profile can - for example using an infrared or CCD camera - be recorded and from the temperature profile then (indirectly) the lubrication process can be determined.

The lubrication process can directly. B. due to a surface condition of the metal strip behind the roll stand can be determined. The surface texture of the metal strip can, for example, optically on a or be recorded on both sides of the tape.

It is possible that information about the lubrication process to an operator is issued for the roll stand and that the operator adjusting the amount and / or distribution of the lubricant and / or the at least one rolling parameter.

However, the rolling process works more comfortably if the information about the Lubrication curve is output to a controller and the controller's setting the amount and / or the distribution of the lubricant and / or the performs at least one rolling parameter.

If it is determined on the basis of the determined lubrication curve that the Lubrication is deficient only locally, is preferably also only locally on the Lubrication conditions influenced. This is usually done by that changes the defects and / or the distribution of the lubricant becomes. On the other hand, systematic lack of lubrication, e.g. B. Lack of lubrication at both ends of the band across the metal band width, can e.g. B. influenced the roll bending of the work roll become. Of course, other rolling parameters can also be influenced.

The change in the amount and distribution of the lubricant can e.g. B. done in such a way that the lubricating device is a basic lubricating device and has an additional lubrication device and the amount and distribution of constant lubricant to be applied by the basic lubrication device the amount and / or distribution of that to be applied by the additional lubrication device Lubricant is adjustable.

But it is also possible to provide only the basic lubrication device and the Amount and distribution of that to be applied by the basic lubrication device Adjust lubricant.

When adjusting the amount and / or distribution of the lubricant and / or the at least one rolling parameter to a parent of the controller Rolling plan calculator is transmitted and in the rolling plan calculator adaptive rolling model is implemented, the rolling plan calculator learns after and according to what lubricant quantities and distributions for certain metal strips or pass schedules are required.

The metal strip can consist of different metals, for example Steel, copper, aluminum or brass.

Figur 1

eine Walzanordnung von oben,

Figur 2

einen Temperaturverlauf und

Figur 3

eine Walzanordnung von der Seite.

Further advantages and details emerge from the following description of an exemplary embodiment. Show in principle

Figure 1

a rolling arrangement from above,

Figure 2

a temperature curve and

Figure 3

a rolling arrangement from the side.

According to FIG. 1, a metal strip 1 is rolled into one at a rolling speed v Roll stand 2 rolled with work rolls 3. The roll stand 2 is according to FIG. 1 designed as a two-roll mill stand. So it only shows the work rolls 3 on. Likewise, the roll stand 2 could also support rolls, if necessary also intermediate rolls, shifting systems in one or more of the roll planes etc. or z. B. as a so-called rolling mill stand be trained. The metal strip 1 has a metal strip width b. According to The embodiment consists of the metal strip 1 made of steel. But it could also made of another metal, e.g. B. copper, aluminum or brass.

A lubrication device 4 is assigned to the roll stand 2. According to Figure 1 arranged in front of the roll stand 2. By means of the lubrication device 4 an amount of lubricant 5 (e.g. an oil-water mixture) over the metal bandwidth b distributed on the metal strip 1 from above and below. The Lubrication device 4 has a basic lubrication device 4 'and an additional lubrication device 4 "on. The amount and distribution of that from the basic lubricator 4 'is to be applied lubricant 5 - at least during of a stitch - constant. The amount and / or distribution of the of the Additional lubrication device 4 "to be applied lubricant 5, however adjustable.

It is also possible to have only a single lubrication bar 4 'for each hinge side. provide for the amount and / or distribution of the applied Lubricant 5 is adjustable.

The metal strip 1 has behind the roll stand 2 over the metal strip width b a temperature curve. The roll stand 2 is therefore a temperature profile detection device 6 subordinate. The temperature runout detection device 6 is designed, for example, as an infrared camera. By means of the Temperature profile detection device 6 is the temperature profile of the Metal strip 1 cyclically behind the roll stand 2 over the metal strip width b detected. The lubrication curve is then determined from the temperature curve or inferred about possible stability problems in the roll gap. The temperature profile detection device 6 thus serves as a lubrication course detection device 6th

The temperature profile detection device 6 can be designed in various ways his. Instead of an infrared camera, for example, there is also a CCD camera or a sensor array in question. In any case, the temperature profile detection device should 6 arranged as close as possible to the roll stand 2 his. The distance should be a maximum of 5 m to 10 m.

According to Figure 1, the lubrication course detection device 6 with a controller 7 connected. The controller 7 is in turn with the lubrication device 4 and / or the roll stand 2 connected by control technology. Due to the recorded temperature or lubrication course, the controller 7 can adjust the setting Amount and / or the distribution of the lubricant 5 and / or at least one Rolling parameters, e.g. B. the rolling speed v, make.

The lubrication course detection device 6 is also connected to a controller 7 Rolling plan computer 8 connected. The rolling schedule computer 8 is the controller 7 superior. An adaptive rolling model is implemented in it. So can adjusting the amount and / or distribution of the lubricant 5 and / or at least one rolling parameter, e.g. B. the rolling speed v, can also be transmitted to the rolling schedule computer 8. The rolling schedule calculator 8 is able to adapt the rolling model implemented in it, so that with a newly rolled metal strip 1 better presettings made can be.

According to FIG. 1, the lubrication course detection device 6 is also included an output device 9 connected. The output device 9 is, for example a monitor, through which information about the lubrication process an operator 10 is issued for the roll stand 2.

In Figure 2 are three different, to the minimum temperature across the Metal bandwidth b normalized temperature profiles A, B, C shown. Furthermore is a dashed line drawn in which corresponds to a temperature which is above the minimum temperature by a predetermined percentage. The percentage is typically between 5% and 10%.

In the case of the temperature profile A, this does not exceed any of the metal bandwidth b Place the dashed line. The metal strip 1 is thus across the metal strip width b adequately lubricated at every point. Control interventions are not required.

At temperature point B, the dashed line is exceeded at one point. There is insufficient lubrication at this point. To fix this Lack of lubrication, the additional lubrication device 4 "is controlled locally especially the amount of lubricant to be applied in this area 5 increase.

There is a systematic rolling error in the temperature profile C because the metal strip 1 is poorly lubricated on its two outer edges. In this Fall can - of course, taking into account the band tantra - a Rolling parameters are changed, e.g. B. the roll bending at one More rolling mill. A control of the additional lubrication device 4 "is but also possible.

Figure 3 corresponds essentially to Figure 1. It is particularly clear from Figure 3 can be seen that the lubricant 5 both from above and from below the metal strip 1 is applied. In contrast to the embodiment 1, however, there is no controller 7. Setting the crowd and / or the distribution of the lubricant and / or the at least one Rolling parameters are therefore carried out by the operator 10 according to FIG. 3.

With the rolling method according to the invention or the corresponding one Roll arrangement is for the first time a controlled lubrication in the roll gap reachable. This leads to a higher stability, an optimized amount of lubricant and distribution, a planer metal strip 1 and a reduced Slip.

The rolling process can be used in all rolling processes. Especially but it is advantageously used when the metal strip 1 is cold-rolled is, the rolling arrangement is designed as a cold rolling arrangement.

LIST OF REFERENCE NUMBERS

1

metal band

2

rolling mill

3

strippers

4, 4 ', 4 "

lubricators

5

lubricant

6

Temperature curve detector

7

regulator

8th

Rolling plan calculator

9

Output device / Monitor

10

operator

A, B, C

temperature gradients

b

Metal bandwidth

v

Rolling speed / rolling parameters

Claims (8)

1. Rolling method for a metal strip (1), wherein the metal strip (1) is rolled in at least one roll stand (2), wherein a quantity of lubricant (5) is applied to the metal strip (1) in distribution over the width (b) thereof, characterised in that the temperature course of the metal strip (1) is determined over the metal strip width behind the roll stand (2), wherein the temperature is measured by an infrared or a CCD camera (6), the measured temperature is compared with a predetermined temperature, and the location or locations of the metal strip (1) where the measured temperature lies above the predetermined temperature is or are determined and is or are utilised for setting the quantity and/or distribution of the lubricant (5).
2. Rolling method according to claim 1, characterised in that information about the temperature course is issued to a user (10) for the roll stand (2) and that the user (10) undertakes setting of the quantity and/or the distribution of the lubricant (5) and/or at least one rolling parameter (v).
3. Rolling method according to claim 1, characterised in that information about the temperature course is issued to a regulator (7) and the regulator (7) undertakes setting of the quantity and/or the distribution of the lubricant (5) and/or at least one rolling parameter (v).
4. Rolling method according to claim 3, characterised in that the setting of the quantity and/or the distribution of the lubricant (5) and/or at least one rolling parameter (v) is communicated to a rolling plan computer (8) superordinate to the regulator (7) and that an adaptive rolling model is implemented in the rolling plan computer (8).
5. Rolling arrangement for carrying out the method according to one of the preceding claims, with at least one roll stand (2) for rolling a metal strip (1) and a lubricating device (4), which is associated with the roll stand (2), for application to the metal strip (1) of a quantity of lubricant (5) distributed over the width (b) of the metal strip (1), characterised in that an infrared or CCD camera (6) for measuring the temperature course in the metal strip (1) is arranged behind the roll stand (2) and is connected with the lubricating device (4) by way of a regulator (7) for setting the quantity and/or distribution of the lubricant (5).
6. Rolling arrangement according to claim 5, characterised in that the lubricating device (4) comprises a basic lubricating device (4') and a supplementary lubricating device (4") and that the quantity and distribution of the lubricant (50 to be applied by the basic lubricating device (4') during a pass is constant and the quantity and/or distribution of the lubricant (5) to be applied by the supplementary lubricating device (4") is settable.
7. Rolling arrangement according to claim 5 or 6, characterised in that the infrared or CCD camera (6) is connected with an output device (9) for issuing information about the determined temperature course to a user (10) for the roll stand (2).
8. Rolling arrangement according to claim 5, characterised in that the infrared or CCD camera (6) is connected with a rolling plan computer (8) superordinate to the regulator (7) and that an adaptive rolling model is implemented in the rolling plan computer (8).

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