EP2258492A1 - Method for producing a milling product with a mill train, control and/or regulating device for a mill assembly for producing milled products, mill assembly for producing milled products, machine readable program code and storage medium - Google Patents

Abstract

The method involves controlling and/or regulating a rolling stand (2) of a rolling mill (1) i.e. cold roll tandem train, based on a detected milling product parameter and/or a detected position of a milling product. The parameter and/or the detected milling product position are detected during tensile stress-free condition of the milling product in a contact-less manner by electromagnetic waves or detected during a condition in which the milling product comprises non-zero tensile stress in a contacting manner. A roller (8) covered by the rolling stand is controlled and/or regulated. Independent claims are also included for the following: (1) a milling system for manufacturing milled products (2) a machine readable program code for a control and regulating device for a milling system comprising control commands to perform a method for manufacturing a milling product (3) a storage medium with a machine readable program code to perform a method for manufacturing a milling product.

Description

The invention relates to a method for producing a rolling stock by means of a rolling train, wherein the rolling mill comprises at least one rolling stand, which is controlled and / or regulated on the basis of a detected rolling stock parameter and / or a detected rolling stock of the rolling stock. Furthermore, the invention relates to a control and / or regulating device for a rolling mill, a rolling mill for the production of rolled rolling, a machine-readable program code and a storage medium.

In the production of metal strips by means of a rolling train, compliance with desired rolling parameters, such as strip flatness, is an essential economic criterion for the rolling mill operator. Problems with ribbon flatness, i. Failure to comply with certain tolerances, leading to economic losses due to non-deliverable metal strip up to plant downtime for very large unplanations.

Problems with rolling stock parameters, e.g. Band flatness occurs, for example, during threading operations. This leads to rolling stock losses, since at least one rolling stock parameter of the produced rolled stock is outside the predetermined tolerance range.

This failure to comply with a desired Walzgutparameters threading operations is usually caused by the fact that during threading the band profile is usually not yet known because band profile measuring devices usually can only detect a band profile when the band is under a tensile stress. When threading, however, the tape head is still free, and so succeed until the construction of a tensile stress no band profile measurement.

As a result, however, it is not possible to set the roll gap in such a targeted manner that a defect-free product is rolled. Because there are no essential parameters for adjusting the roll gap, such as knowledge about the strip profile.

This often leads to errors in the band flatness during threading. Also, a running of the belt may occur, which makes the error-free production of a product with the rolling train difficult.

In principle, such difficulties always occur when the rolling stock is not under tension.

The invention has for its object to produce less Walzgutausschuss in rolling processes.

The object is achieved by a method for producing a rolling stock by means of a rolling train, wherein the rolling mill comprises at least one rolling mill, which is controlled and / or regulated on the basis of a detected rolling stock parameter, in particular the strip flatness, and / or a detected rolling stock of the rolling stock, wherein the Walzgutparameter and / or the detected rolling stock is detected without contact during a tension-free state of the rolling stock and during a state in which the rolling stock has a non-zero tensile stress, contact is detected. The method according to the invention thus provides a possibility to carry out a targeted control of a rolling mill already in draft-free condition, in particular with regard to the strip flatness and / or the strip position. As a result, tolerances of the tape are better respected, resulting in less waste is produced. Thus, the system is operated more economically.

Walzgutparameter are parameters that describe the rolling stock itself. In particular, suitable rolling stock parameters are: the flatness of the rolling stock, the profile of the rolling stock. In addition, however, further rolling parameters can be used, such as thickness, surface finish, etc ..

A tension-free state of the rolling stock is when a rolling mill, in particular the measuring range of the detection devices, continuous part of the rolling stock, in particular band, has no tension in the transport direction of the tape, i. the tension is zero. This is usually the case when the beginning of the strip and / or the end of the strip passes through the rolling train. In this case, the rolling stock parameter and / or the strip position is detected contactlessly and the rolling gap is set on the basis of these measured values. Conventionally, the roll gap in these boundary conditions is merely set to suspect or preset, without current readings are present. This leads to the production of a band whose beginning is only "more or less" flat. The setting "suspected" is often done manually, i. by operating personnel, or by means of computer models. By this type of roll gap adjustment is increasingly produced Walzgutausschuss, which can be significantly reduced by the invention.

Once a tension is built up in the transport direction of the belt, i. a predetermined, non-zero desired tension value is achieved, the contact-based measurement of the rolling stock parameter can be carried out. This is usually more accurate than the contactless measurement of the rolling stock parameter, especially in the presence of tensile stress. As a result, the quality of the outlet product from the rolling mill is further increased.

The non-contact detection and the contact-based detection are suitable to detect at least one rolling stock parameter and / or the rolling stock, the or also of each other detection device is detected. That is, in a tension-free state, for example, first a first rolling stock parameter is detected without contact. Subsequently, the same first rolling stock parameter is detected by contact. The devices for contactless and contact-related detection of rolling stock parameters are thus designed in such a way that at least one rolling stock parameter that can be detected by both devices, for example the strip flatness, can be detected.

The method is applicable to hot rolling and cold rolling, wherein a rolling train comprises at least one rolling stand, in particular a plurality of rolling stands. The non-contact and the contact-based measuring device may be arranged downstream of the last rolling stand of the rolling mill, be upstream of the rolling mill, or be arranged between the rolling stands of the rolling mill, provided that this comprises a plurality of rolling stands. The arrangement of the measuring devices within the rolling train depends on the circumstances under which they are to be used. The invention can be used particularly advantageously when threading. In this case, at least two measuring devices are provided, one for contactless detection and one for contact-based detection. Preferably, these are arranged downstream of the last roll stand of the rolling train in the mass flow direction. However, additional additional measuring devices can be provided.

In an advantageous embodiment, the non-contact detection of the rolling stock parameter and / or the rolling stock takes place by means of electromagnetic waves, in particular in the visible spectral range. Such devices are known, for example. From EP 1 418 400 A2 , Such devices allow a flatness measurement in the tension-free state of the band, so that the advantages of the invention can be realized.

In a further advantageous embodiment, the contact-related detection of the rolling stock parameter and / or the rolling stock takes place by means of a measuring roller, in particular a segmented measuring roller. Such measuring rollers are known, for example. Off DE 19 83 84 57 A1 , By means of such measuring rollers, the flatness of a belt under tension can be detected with high accuracy. Such accuracy for a rolling stock parameter to be detected, in particular flatness, is as a rule not yet achieved by means of the contactless detection currently available above.

In a further advantageous embodiment, a transition from a contactless detection to a contact-based detection takes place as soon as the tensile stress of the rolling stock reaches a first predetermined desired tensile stress. This procedure is particularly advantageous when threading and reduces the rejects of rolling stock by maintaining the tolerances of the rolled rolled stock, in particular the flatness. The predefinable desired tensile stress may, for example, be 20% of the nominal tensile stress which the band has during stationary operation of the system. However, any other desired tensile stresses which are suitable for measuring a rolling stock parameter and / or a rolling stock under tension may also be specified by the person skilled in the art.

In a further advantageous embodiment of the invention, a transition from a contact-based detection to a contactless detection takes place as soon as the tensile stress of the rolling stock reaches a second predetermined target tensile stress. In this case, a tensile stress of the tape is broken down, whereby a change in the detection method is necessary. Such a procedure can be used when unthreading the tape. The first and the second predefinable value for the desired tensile stress may be identical or different from each other.

In a further advantageous embodiment of the invention, an inclined position and / or a roll bending and / or a displacement position of at least one roll comprised by the at least one roll stand is controlled and / or regulated on the basis of the detected rolling stock parameters and / or the rolling stock. In the mentioned roller, it may depend on the used rolling stand, for example, quarto or Sexto scaffold, work rolls, back-up rolls or intermediate rolls act. By setting at least one roller in the manner mentioned, the desired belt parameters can be influenced in such a way that a desired outlet product is produced.

The object is further achieved by a control and / or regulating device for a rolling mill for the production of rolled rolling stock, with a machine-readable program code having control commands, which in their execution, the control and / or regulating device for performing the method according to one of the claims 1 to 6 cause.

In addition, the object is achieved by a rolling mill for the production of rolled rolled stock, having a rolling train which comprises at least one controllable and / or controllable rolling stand, with a device for contacting at least one rolling stock parameter and / or a rolling stock, with a device for contactless Detecting at least the rolling stock parameter and / or the rolling stock, with a control and / or regulating device according to claim 7, wherein the rolling train, the contact-based detection device and the contactless detection device are operatively connected to the control and / or regulating device.

In addition, the object is achieved by a machine-readable program code for a control and / or regulating device for a rolling mill, wherein the program code has control commands that cause the control and / or regulating device for carrying out the method according to one of claims 1 to 6.

The object is likewise achieved by a storage medium with a machine-readable program code stored thereon according to claim 9.

• FIG 1 einen schematischen Ausschnitt einer Walzanlage, wobei das Band einen zugspannungsfreien Zustand aufweist,
• FIG 2 einen schematischen Ausschnitt einer Walzanlage, mit einem unter Zug stehenden Band.

Further advantages of the invention will become apparent from an embodiment which is explained in more detail with reference to schematic drawings. Show it:

• FIG. 1 a schematic section of a rolling mill, wherein the tape has a tension-free state,
• FIG. 2 a schematic section of a rolling mill, with a band under train.

FIG. 1 shows a section of a rolling mill, comprising a rolling mill 1, in particular a cold rolling tandem mill. This includes in the exemplary embodiment two rolling stands, wherein in FIG. 1 only the last rolling stand 2 of the tandem mill 1 is shown.

FIG. 1 shows a threading during cold rolling, wherein the tape head of the belt G is still free, and on a reel 9, see. FIG. 2 , tapped. The tape head has according to FIG. 1 the last rolling stand 2 already happened. However, the band G is not yet under train after the last rolling stand 2.

During the threading operation, a tension applied to the band G is preferably detected and evaluated. As a result, it can be determined whether and which parts of the belt G are already under tension.

In the mass flow direction of the belt G downstream of the last rolling stand 2 of the tandem mill 1, a device 3 for contactless detection of the band flatness is arranged. This is formed in the embodiment as a camera system which detects electromagnetic waves, in particular light, the flatness of the tape and / or the band position after the last mill stand 2. In the present exemplary embodiment, the camera 3 is arranged above the belt G and detects from this position the belt surface facing the camera 3.

Also in the direction of mass flow of the belt G after the last mill stand 2 is a device 4 to the contact Collection of the band flatness arranged. This is formed in the embodiment as a segmented measuring roller 4, over which the belt G is guided. Such measuring rollers 4 are known and can be used when a belt is under tension.

Further shows FIG. 1 a control and / or regulating device 5 by means of which the rolling train 1, in particular the last rolling stand 2 of the tandem rolling mill 1, is controlled or regulated.

For this purpose, a machine-readable program code 7 was stored in a programmable manner on the control and / or regulating device 5, which comprises control commands which, when executed, cause the control and / or regulating device 5 to carry out an embodiment of the method according to the invention. The machine-readable program code 7 can be transmitted, for example, by means of a storage medium 6 to the control and / or regulating device 5. Alternatively, a deposit of the program code 7 can also take place by means of a network to which the control and / or regulating device 5 is connected.

In FIG. 1 the tape head runs on the reel 9, cf. FIG. 2 , too. During threading, measured values for flatness are not yet available in known systems since contact-based measurements by means of segmented measuring rollers are generally only possible if the strip tension is present. As a result, in the prior art, the rolling train 1, in particular the last rolling stand 2, is controlled or regulated during threading either manually or on the basis of computer models.

However, the invention makes it possible already during threading in still tension-free state of the belt G, a flatness measurement and / or measurement of the tape position by means of a contactless detection. The measuring roller 4, however, is inactive during threading.

Thus, due to the non-contact detection measured values are available, based on which adjustment of the flatness and / or the tape run on the last roll stand 2 can be made as long as the tape is draft-free, possibly even beyond this state, if desired. As a result, even at a relatively early stage of the process an outlet product is produced which has a high quality. This leads to the reduction of rolling stock.

For this purpose, the flatness of the belt G and / or the course of the belt in a tension-free state is determined by means of the camera 3. This can be done by an integrated into the camera 3 evaluation or in a separate evaluation. In particular, the evaluation device can also be integrated into the control and / or regulating device 5.

On the basis of the detected flatness control variables are determined, by means of which the available and suitable actuators are set on the rolling mill to influence the flatness and / or band position. This can be done by known methods.

An influencing of the flatness and / or the band position can take place, for example, in the shown four-high rolling stand by the bending of the work rolls, the skew of the work rolls, and / or by a displacement of work rolls.

If the tape head reaches the reel 9, cf. FIG. 2 , And if the tape head is reeled, so a tape pull builds up, which rises to a desired tension and is then controlled usually to a desired value.

Already during the train construction, a switchover of the contactless measurement by means of the camera 3 to the contact-type measurement by means of the measuring roller 4 can take place. For this purpose, a corresponding threshold can be specified, when it reaches or exceeds a change in the detection of the band flatness and / or the band position of a contactless detection on a contact-based detection takes place. In practice, 20% of the nominal tension value in stationary operation has proven to be an appropriate threshold value.

In FIG. 2 the tape head is already reeled on the reel 9. The belt G is in the measuring range for the flatness measurement and / or the tape position measurement under train. In this case, the camera 3 for non-contact detection of the flatness and / or the band position is inactive. The band flatness and / or the band position is detected by means of the measuring roller 4. On the basis of the acquired data, manipulated variables for the actuators of the rolling train 1, in particular of the last rolling mill 2, are determined by means of the control and / or regulating device 5.

By an appropriate adjustment of the actuators of the rolling mill, the quality of the outlet product can be kept constant high.

In a special case, a contact-type measurement may be continuous, i. even while the band is under train done. Thereby, for example, measurement results of the measuring roller 4, e.g. with regard to the recorded band position, be controlled and verified. In this case, only the contact-type measurement is then switched on or off as a function of the present strip tension while the contactless measurement is independent of the strip tension, that is, for example, constantly.

The setting of the actuators based on the contact-type measurement can be carried out for a plurality of rolling stands 2 of the rolling train 1, provided that a rolling mill comprises a plurality of rolling stands.

Switching from a non-contact detection of the rolling stock parameters and / or band position is expediently carried out on the basis of the applicability and the achievable measuring accuracy of the respective detection systems.

The device 3 which detects the rolling stock parameters and / or the rolling stock without contact does indeed deliver data at a time when the measuring roll 4 can not yet provide any data. On the other hand, the accuracy of the measuring roller 4 is much higher than that of the camera 3. However, this requires that the belt G is under tension.

By combining these devices 3 and 4, it is possible to reduce the rolling stock incurred during threading.

The invention is applicable in an analogous manner for the unthreading of a metal strip from a rolling mill.

Claims (10)

Method for producing a rolling stock (G) by means of a rolling train (1), wherein the rolling train (1) comprises at least one rolling stand (2) which is controlled and / or regulated on the basis of a detected rolling stock parameter and / or a detected rolling stock of the rolling stock (G) becomes,
characterized in that the rolling stock parameter and / or the detected rolling stock is detected without contact during a tension-free state of the rolling stock (G) and during a state in which the rolling stock has a non-zero tensile stress, contact is detected. Method according to claim 1,
characterized in that the contactless detection of the rolling stock parameter and / or the rolling stock is effected by means of electromagnetic waves. Method according to claim 1 or 2,
characterized in that the contact-related detection of the rolling stock parameter and / or the rolling stock is effected by means of a measuring roller, in particular a segmented measuring roller, over which the rolling stock is guided. Method according to one of the preceding claims,
characterized in that a transition from a contactless detection to a contact-type detection takes place as soon as the tensile stress of the rolling stock (G) reaches a first predetermined target tensile stress. Method according to one of the preceding claims,
characterized in that a transition from a contact-based detection to a contactless detection takes place as soon as the tensile stress of the rolling stock (G) reaches a second predetermined target tensile stress. Method according to one of the preceding claims,
characterized in that on the basis of the detected rolling stock parameters and / or the rolling stock an inclined position, a roll bending and / or a roll displacement of at least one of the at least one rolling stand (2) comprised roller (8) controlled and / or regulated. Control and / or regulating device (5) for a rolling train (1) for producing rolled rolled stock (G), having a machine-readable program code (7) which has control commands which, when executed, include the control and / or regulating device (5). for carrying out the method according to one of claims 1 to 6 cause. Rolling plant for the production of rolled rolled stock (G), comprising a rolling train (1) comprising at least one controllable and / or controllable rolling stand (2), with a device (4) for contacting at least one rolling stock parameter and / or a rolled stock a device (3) for contactless detection of at least one rolling stock parameter and / or a rolling stock, with a control and / or regulating device (5) according to claim 7, wherein at least one rolling stand (2) of the rolling train (1), the device (4) for contact-type detection and the device (3) for contactless detection with the control and / or regulating device (5) are operatively connected. Machine-readable program code (7) for a control and / or regulating device (5) for a rolling mill, wherein the program code (7) has control commands which, when executed, the control and / or regulating device (5) for carrying out the method according to one of Induce claims 1 to 6. Storage medium (6) with a machine-readable program code (7) stored thereon according to claim 9.

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