EP2170535B1 - Method for adjusting a state of a rolling stock, particularly a near-net strip - Google Patents

Description

The invention relates to a method for adjusting a state of a rolling stock, in particular a Vorbands, which is defined by at least a wedge and / or saberiness of the rolling stock, wherein the rolling stock from an initial state by rolling by means of a roll stand, in particular a Vorgerüsts, and by embossing a tension in the rolling stock is transferred by means of additional processing means in an intermediate state, and wherein the rolling stock is transferred from its intermediate state by means of at least one processing unit in a final state.

In a rolling mill all the equipment needed for the production of rolled products can be combined. Depending on the type of forming hot and cold rolling mills are differentiated. In the hot rolling mills or hot strip rolling mills, slabs or ingots, usually called slabs for short, are processed to hot strip. This hot forming is one of the methods that follows the original forming (ingot casting, continuous casting). In this case, the rolling stock is heated to temperatures up to 1350 ° C and preferably reduced above its recrystallization temperature in a rolling nip of the rolling mill by pressure to a predetermined thickness. The overall complex of a hot rolling mill may include: primary stock; reheating furnaces; descaling; Roughing and finishing line with a different number of scaffolds, scaffolding groups and scaffold types; coilbox; Coolers; finishing equipment; Reel (s) and ready-made material store. Furthermore, bearings can be used for a rolling mill; Transport and management equipment and extensive control, and measurement systems belong.

Since the finished product (usually steel or aluminum strip) can rarely be rolled out in one pass, several rolling stands are combined to form a rolling mill, in which several rolling passes are performed according to the number of scaffold runs. In hot rolling mills, a distinction is made between the roughing mill and the finishing mill, whereby the slab is pre-processed in the roughing mill and then rolled to its final dimensions in the usually five-, six- or seven-stand finishing train.

In the rolling mill, the rolling stands represent the central parts of the plant. The roll stands of the rolling stands must absorb the high rolling forces that occur and must stretch as little as possible. The roll bearings of the roll stands ensure proper guidance of the rolls and transfer the rolling forces to the roll stand via the setting system, the setting devices of the setting system serving to horizontally and vertically position the rolls. The adjusting devices can be actuated mechanically, electromechanically or hydraulically. In general, when rolling hot strip wide four-roll stands, so-called Quarto scaffolds are used, which consist of two working and two back-up rolls, the back-up rolls usually have a larger diameter than the work rolls.

One of the problems with rolling slabs or the strips resulting therefrom is that the rolling stock to be rolled in a roughing train has a thickness progression across its width. The aim is usually to produce by means of rolling bands, on the one hand at the end of the finishing train has a substantially symmetrical to the band center thickness across the width, i. are free of wedges, and on the other hand have the least possible bending over the length of the rolling stock, i. are saber-free.

However, to achieve this is difficult if a rolling stock is to be rolled, which is already wedge-shaped in the first rolling within the hot rolling mill. The wedging of the rolling stock usually results from the casting process and the subsequent cooling and further processing, in particular halving, of the cast slabs.

If now a wedge-shaped rolling stock is to be rolled out into a slab having a substantially rectangular cross-section, the volume flow on the "thicker" side of the slab results in a greater flow of material, in particular longitudinal flow, than on the "thin" side of the slab. The consequence of this different material flow in the longitudinal direction of the rolling stock is the formation of a saber shape or a saber. Depending on the shape of the saber, a saber-shaped rolling stock can lead to difficulties in subsequent processing of the rolling stock. The formation of the saber can be so strong that further processing of the rolling stock is impossible.

From the publication WO 2006/119984 A1 is a method and apparatus for targeted influencing the Vorbandgeometrie known in a roughing stand, wherein in one or more roughing mills slabs are rolled into Vorbändern. By specifically influencing the Vorbandgeometrie on at least one roughing mill by appropriate regulations a dynamic employment in the roughing stand with fast and powerful side guides before and behind the roughing stand are linked together so that in one or more stitches targeted, reversing or continuous operation, a saber or wedge Slab is transformed into a straight and wedge-free Vorband, a method can be provided, which makes it possible to produce just pre-tapes without thickness wedge and without lateral curvature.

Disadvantage of the teaching mentioned in the above disclosure is that only straight pre-tapes without thickness wedge and without lateral curvature are generated here. However, this saber-free, wedge-free form of the rolling stock can be lost again by subsequent machining of the rolling stock. Furthermore, when using the fast and strong side guide high forces occur, which can lead to the defect of the side guide and the band edge of the Vorbandes strong, and thus at a disadvantage, can burden.

Object of the present invention is to provide a generic method of the type mentioned, which increases the form of security for a final wedge-free, saber-free rolling.

Furthermore, the invention has for its object to provide a control device for performing such a method.

The procedural part of the object of the invention is achieved in a generic method in that it is determined whether the at least one processing unit to supply a rolling stock whose intermediate state requires a non-zero wedging and / or saberiness to achieve a predetermined final state, and depending on the rolling stand and / or the processing means are controlled and / or regulated for setting the respectively required intermediate state.

The final state is predeterminable, i. adjustable. For example, this can be characterized in that in the final state, a desired final thickness is reached and the rolling stock is substantially free of wedge and saber. Depending on which processing unit follows the roll stand, for example, an oven, a rolling train, a cooling unit or a cooling line or an aggregate for descaling, the intermediate state can be adjusted so that after processing of the rolling stock with the corresponding processing units a predetermined final state of the rolling stock is set.

This can lead to the situation in which, if the rolling stock is not impressed by the subsequent processing units deviations from the desired final state, the intermediate state of the rolling stock can already be free of wedge and / or saber-free. However, the other extreme case is conceivable that, depending on the subsequent processing units, from a keiligen initial state with an intermediate state - compared with the initial state - possibly even greater wedging is generated, because only this intermediate state with even greater wedging in cooperation with the subsequent processing units leads to a desired, usually keil- and saber-free final state of the rolling stock. Also, the wedging of the rolling stock can be overridden, that is, the outlet-side wedging of the rolling stand has a reverse sign compared to the input-side wedging of the rolling stand. Simply put, the thicker side of the belt on the inlet side is the outlet side of the thinner belt side compared to the opposite side of the belt on the inlet and outlet side. Possibly. For example, even a desired final state can also be defined by leaving a certain residual chunking and / or saberiness of the rolling stock, since this is necessary for a subsequent application of the rolling stock in a product. This can be regarded as analogous to step plates.

By the method according to the invention can optionally also be discussed flexibly changes in the processing units, such as surface wear of the roller, different thermal expansions of a processing unit associated rollers during operation, etc.

In principle, the wedging and / or saberiness of a rolling stock can be set as desired by pivoting the work rolls in a roll stand. Without the aid of machining means, a change in the thickness wedge of a rolling stock in the rolling stand leads to a change in the saberiness of the rolling stock. The prior art mentioned at the beginning shows how a wedge-free and saber-free pre-strip is produced by means of such processing means. But only by the present invention is the intermediate state, which may include, for example, the thickness of the rolling stock, width of the rolling stock, wedging of the rolling stock, saberiness of the rolling stock, etc., set such that only a desired final state is set by the subsequent processing units. Thus, for example, not directly during rolling in the rolling mill to curvatures leading residual stresses in the rolling stock, flaws in a finishing mill, thermal crown, wear in a finishing train, etc. are taken into account. On the basis of these exemplary enumerated influences, an intermediate state, provided by means of the processing means and of the roll stand, is adjusted such that, for example, a wedge-free, saber-free strip with the desired final thickness is produced.

The stress, which is impressed by means of processing into the rolling stock, can be stamped mechanically, thermally or by means of electromagnetic fields. The processing means then set a desired tension or stress distribution at a certain point in the rolling stock, usually in the nip. As a mechanical processing means for impressing a voltage in the rolling stock are particularly advantageous a stamper and / or a strong side guide.

By impressing the tension in the rolling stock, a symmetrical or asymmetrical tensile / compressive stress distribution or, if necessary, also a transverse stress distribution can be set, in particular at the roll gap, which reduces the material flow, i. Longitudinal flow of the material and lateral flow of the material, influenced. As a result, the wedging and / or saberiness, possibly also the thickness of the rolling stock, can be adjusted. The impression of the tension by means of the processing means is controlled and / or regulated such that a desired stress distribution over the width of the rolling stock - in the rolling stock, at the nip - is set.

The initial state of the rolling stock, from which the rolling stock is transferred to the intermediate state, is usually taken into account. Because different initial states at the same settings of the manipulated variables of the roll stand and the processing means can lead to different intermediate states of the rolling stock. However, these differences in the intermediate states may not be desirable. Can do this the essential parameters characterizing the initial state of the rolling stock, such as wedging, saberiness, thickness, etc., are detected by means of corresponding detection devices. Thereby, the rolling stock can be suitably transferred from the initial state to the intermediate state taking into consideration the final state of the rolling stock and the properties of the subsequent aggregates.

Starting from the at least one intermediary state rolling stand and the additional processing means, the intermediate state can have, for example, a reinforced wedge, a weakened wedge, a reversed wedge or no wedge compared to the initial state. This applies analogously to the saberiness.

The control and / or regulation takes place on the basis of a control and / or regulation model. The parameters influencing the processing of the rolling stock are included in this model. These are composed of the parameters characterizing the rolling stock and of parameters which characterize an interaction of the rolling stand, the processing means and the at least one subsequent processing unit or several subsequent processing units with the rolling stock. By the person skilled in the implementation of the invention usable models are, for example, the DE 101 18 748 A1 : "Method and control for process-controlled modeling of a process plant" removable and about the textbook Chritianini, Shawe-Taylor: "An introduction to support vector machines and other kernel-based learning methods", Cambridge UP, 2000 , This is only a short excerpt of possibilities that the skilled person can fall back on.

For example, physical, empirical or (self) learning models, such as neural networks, may be used to control and / or regulate the rolling stand and the processing means. The use of such models is familiar to the person skilled in the art. In empirical models, particular reference is made to findings which originate from the operation or test operation the respective plant are based. In particular, a model is preferably designed to be on-line capable, ie, during operation of the steelworks, adjusting the control and / or control of the rolling stand and processing means such that the intermediate state in real time depends on the final state and the interaction parameters of the rolling stock machining processing units is set such that a predetermined final state of the rolling stock is achieved by processing with the subsequent units.

In an advantageous embodiment of the invention, an inner, in the further processing of the rolling stock at least on the wedging and / or saberiness of the rolling stock effecting material strain is taken into account in the determination. This ensures that material stresses present in the rolling stock do not lead to a significant deviation from the desired final state of the rolling stock, although the initial state, final state and the interaction parameters of the processing units with the rolling stock have been taken into account in the control and / or control of the rolling stand and the processing means. Thus, a relaxation of the material distortion acting on at least the wedging and / or saberiness of the rolling stock in one or more subsequent processing units, such as furnace or cooling section or finishing train, is included in the adjustment of the intermediate state of the rolling stock. Thereby, a further improvement of the setting of the intermediate state can be achieved.

To take account of the material tension, the material tension in the rolling stock can be measured. In general, however, the material tension will be modeled by suitable models. To optimize the process management, a coupling of measurement and calculation of the material tension in the rolling stock can be provided.

In an advantageous embodiment of the invention, the voltage impressed on the rolling stock is controlled and / or controlled. In general, the processing means are controlled and / or controlled so that they set a desired tension, in particular stress distribution across the width of the rolling stock. By selective regulation and / or control of the voltage, the rolling stock is brought into an intermediate state in cooperation with the possibly dependent control and / or control of the manipulated variables of the actuators of the rolling mill, which leads to the desired final state when working with at least one subsequent unit.

In a preferred embodiment of the invention, a force exerted on the rolling stock is used to impress the tension in the rolling stock. The force is exerted on the rolling stock by means of a mechanical device in order to specifically influence the stress ratios of the rolling stock located in sections in the roll gap. By the point of application of the force and the amount of force, the tension in the rolling stock during rolling in the nip can be adjusted such that the intermediate state required for producing the final state by defined subsequent processing units is set. The force can be exerted on the rolling stock by means of a point-like, a line-like or a surface-like approach area on the rolling stock.

In a further advantageous embodiment, the rolling stock has a generally aligned transversely to a designated transport direction, referred to as Walzgutkopf front, wherein a position of the rolling stock is detected and regulated the force exerted on the rolling stock on the basis of the detected position of the rolling stock and / or controlled becomes. The detection of the rolling stock is advantageous in that it is recognized whether already at all a force can be exerted on the rolling stock or at what level a force is to be impressed at a certain Walzgutposition in the rolling stock to a certain voltage, in particular stress distribution, set in the nip. This is of great importance in particular when a rolling stock is being cut in the at least one rolling stand.

In a preferred embodiment of the invention, a side guide is used as the processing means. By using a side guide, in particular strong side guide, the side guide is a combinatorial effect in the transfer of the rolling stock of its intermediate state in its final state. Because the side guide leads in this context, not only the rolling stock, but by means of the side guide also a voltage is impressed. This is particularly effective in the nip and thereby influences the intermediate state, which is generated by means of the at least one rolling mill from the initial state. There are therefore no additional structural measures to provide to perform the inventive method using a side guide for impressing tension in the rolling stock.

In a further advantageous embodiment of the invention, a stamper is used as the processing means. The stuffer can be used as an alternative to the side guide for impressing tension in the rolling stock, but also in combination with a side guide. The use of a stuffer has the advantage that the two substantially vertically standing work rolls of the stuffer can act independently of each other on the rolling stock. In particular, the rollers of the stuffer can be arranged to each other such that they are not arranged axially symmetrically to a Walzgutmittenlängsachse and / or exert different amounts of force on the rolling stock. The rolling stock center longitudinal axis is that longitudinal axis of the rolling stock which runs through the outlet-side strip center of the rolling stock in the longitudinal direction of the rolling stock. In an advantageous special case, the force of a work roll of the upshot on the rolling stock is zero, that is, this work roll is not in contact with the rolling stock. The other work roll exerts a force on the rolling stock to a stress distribution in the rolling stock across the width of the Walzguts, set at the nip. It can be impressed by the force acting independently on the rolling work rolls of the edger targeted asymmetric stresses in the rolling stock. This also allows a more flexible adjustment of intermediate states. It can thus be covered a wider range of "errors" of subsequent processing units. It can thus be ensured by means of a stuffer particularly advantageous that the desired final state of the rolling stock is adjusted.

The method according to the invention can be used particularly advantageously if at least one processing unit following the rolling stand is a horizontal rolling stand. This advantage is maintained, in particular, if a plurality of horizontal rolling stands are arranged downstream of the at least one rolling mill, which work as a finishing train. In the finishing train, the rolling stand is transferred from its intermediate state to a desired final state. This final state is only then usually the desired final state if, by the method according to the invention, the deviations impressed into the rolling stock by the plurality of horizontal rolling stands have already been taken into account by the intermediate state. By the method according to the invention, which is used for a finishing train, therefore, the quality of the rolling stock transferred to the final state can be further improved with regard to wedging and / or saberiness.

The device-related part of the object is achieved by a control and / or regulating device according to claim 11. Such a control and / or regulating device for setting a state of a rolling stock can be easily retrofitted for existing systems. Thereby, the quality in the setting of a final state of a rolling stock can be increased.

Furthermore, the invention extends to a machine-readable program code for a control and / or regulating device for setting a state of a rolling stock. Thus, the Machine-readable program code can also be used in existing control and / or regulating devices.

This can be ensured, in particular, by the fact that the program code is stored on a data carrier on which the present invention likewise extends.

FIG 1

eine Übersichtsdarstellung für das erfindungsgemäße Verfahren,

FIG 2

die Ausbildung eines Säbels bei einem Walzvorgang in einem Vorgerüst,

FIG 3

die Anwendung eines erfindungsgemäßen Verfahrens zur Einstellung eines definierten Zwischenzustands des Walzguts,

FIG 4

ein Vorgerüst und eine dem Vorgerüst nachgeordnete Fertigstraße.

Further advantages of the invention will become apparent from the following embodiments, which are explained in more detail with reference to the drawings shown schematically. Show it:

FIG. 1

an overview of the process according to the invention,

FIG. 2

the formation of a saber during a rolling process in a roughing stand,

FIG. 3

the application of a method according to the invention for setting a defined intermediate state of the rolling stock,

FIG. 4

a roughing stand and a finishing mill downstream of the roughing stand.

FIG. 1 shows an overview for setting a state of a rolling stock. Starting from an initial state S1 with the rolling stock cross section GX, the rolling stock is fed to a roughing stand 1. The roughing stand 1 has a set of work rolls 2 and a set of backup rolls 3. Furthermore, a device for adjusting the rollers in the form of a hydraulic adjustment 5 is present. By means of the hydraulic adjustment 5, the rolling force on the operating side and the drive side can be adjusted. Furthermore, measuring devices are provided which measure the operating-side rolling force and the drive-side rolling force and feed it to a control device which also controls the hydraulic adjustment 5. Further, the control device 4 is supplied to a desired final state S3 'of the rolling stock. The desired final state S3 'is usually the state ready for that rolled strip is provided. In general, the desired final state includes a certain target thickness, a specific phase mixture, and the property of the rolling stock that this is free of wedge and saber.

The control device 4 is also fed information about which processing units passes through the rolling stock after leaving the roughing stand 1. In particular, the control device is supplied in how far the respective processing units influence the geometry of the rolling stock. The geometry of the rolling stock can be influenced by thermal processes, for example heating processes or cooling processes, as this changes internal stresses in the rolling stock, or by direct mechanical action on the rolling stock, for example by rolling the rolling stock. The change in the geometry of the rolling stock by thermal and / or mechanical processes is u. a. Also dependent on how far there are internal stresses in the rolling stock before this particular aggregate. In this respect, the initial state S1 of the rolling stock, if necessary for the processing of the rolling stock by means of a processing unit, must be taken into account.

By means of the information relating to the roughing stand subsequent processing units and the desired final state is by means of a regulation of the rolling process in the roughing stand 1, for example, in another way, as in the published patent application WO 2006/119984 A1 known to transfer the rolling stock in an intermediate state S2. The intermediate state S2 is characterized by the fact that it depends on the processing steps now provided for the rolling stock. As a rule, this intermediate state S2 will have a wedging and / or a saberiness. Subsequently, the rolling stock passes through the intermediate state S2, for example, a plurality of processing units, such as A1, A2, A3 to AN. After passing through the last processing unit AN, the final state S3 of the rolling stock is set. This is fed to the control device 4 of the roughing stand. There is ao a comparison between desired end state S3 'and the actual end state S3 instead.

1. 1. Der Walzspalt wird so eingestellt, dass die relative Dickenabnahme an jeder Stelle entlang des Walzspaltes gleich ist. Dadurch ist die Verlängerung des Materials an allen Punkten entlang der Breitenrichtung gleich und es kommt zu keiner säbelartigen Verzerrung des Bandes, allerdings bleibt der Keil bis ins Fertigband erhalten. Da in der Regel ein keilförmiger Endzustand unerwünscht ist, stellt dies keine Lösung des Problems dar.
2. 2. Der Walzspalt kann symmetrisch eingestellt werden, d.h. bis auf Durchbiegungseffekte stehen die Walzen parallel zueinander. Wegen des im Walzgut vorhandenen Dickenkeils kommt es jedoch zu einer über die Breite des Walzguts ungleichmäßige Umformung. Diese führt aufgrund der bedienseitigen und antriebsseitigen unterschiedlichen Dicke des Walzguts zu einer unterschiedlichen Verlängerung des Materials über die Breite des Walzguts. Dies verursacht die Ausbildung eines Säbels. Das Vorliegen eines über bestimmte Grenzabmessungen überschreitenden Säbels führt zu Schwierigkeiten bei der weiteren Prozessierung des Walzguts.

In the processing of wedge-shaped rolling stock to metal strip - as far as device-wise no preventive measures are taken - two limiting cases prevail:

1. 1. The nip is adjusted so that the relative decrease in thickness at each point along the nip is the same. As a result, the elongation of the material at all points along the width direction is the same and there is no saber-like distortion of the band, however, the wedge is retained up to the finished band. Since usually a wedge-shaped final state is undesirable, this is not a solution to the problem.
2. 2. The roll gap can be adjusted symmetrically, ie, except for deflection effects, the rolls are parallel to each other. Because of the thickness wedge present in the rolling stock, however, an uneven deformation occurs across the width of the rolling stock. This results in a different extension of the material over the width of the rolling stock due to the different operating and drive side different thickness of the rolling stock. This causes the formation of a saber. The presence of a saber exceeding certain limit dimensions leads to difficulties in the further processing of the rolling stock.

In order to produce a rolling stock which is substantially free of wedge and saber-free, it is first necessary to detect a saber or wedge of the rolling stock, when it arises. There are various possibilities for this. According to the prior art, for example, in the presence of a wedge-shaped centered rolling stock, such as a slab, a differential rolling force between operating side and drive side of the roughing stand 1 can be determined. However, this rolling force difference is not clearly due to the formation of a saber. The cause of the rolling force difference between operating side and drive side may also be due to the fact that the strip during rolling, that is decentered, or has a temperature inhomogeneous across the width. The latter results in a deformation resistance which varies over the width and thus a forming force varying over the width in order to produce a defined rolling stock condition.

In order to recognize a saber safely, it is therefore also necessary to use, for example, a side guide, which is exposed in the formation of a saber a significant increase in force by the curved rolling stock. Because the saber presses on the side guide. However, if it is designed as a strong side guide, this can prevent or suppress the formation of the saber.

Furthermore, in order to determine the original thickness wedge causing the saber and the degree of saberiness, it is necessary to perform tape edge detection, for example by means of a width gauge, and to use tape edge detection for sabel diagnosis. As measuring systems, for example, camera or laser-based measuring systems can be used.

Only when these three indicators are available can be concluded on a thickness wedge and a saber of the rolling stock, as well as their dimensions. Alternatively, a reliable measurement of the rolling stock with regard to wedging can be carried out particularly advantageously at the furnace entry.

From the aforementioned prior art, it is known to avoid such a wedging and / or sullenness for a rolling stock directly after the roughing stand, i. to produce the production of a substantially saber-free and wedge-free rolling stock by processing the rolling stock with the roughing stand.

Also, the case may occur that the wedging of the incoming rolling mill in the rolling stock is too large, ie by The saber-forming force on the side guide can not be absorbed by this or leads to their destruction. In this case, it is necessary to dispense with the complete roll alignment control and to pivot the rollers according to the wedge. Possibly. can also take place a reduction of the wedge of the incoming rolling stock by means of the rolling mill to the extent that the force acting on the side guide force does not destroy them. The residual wedge is then successively eliminated by subsequent stitches.

The problem here, however, is that the substantially set to zero wedging and / or saberiness can be converted by subsequent processing units back into a wedging and / or saber unequal to zero. Such a change in the rolling stock geometry may, for example, be caused by the rolling stock itself, such as by internal stresses, or by external influences on the rolling stock, such as worn rolls, thermal crown, roll offset, roll deflection, temperature changes, entry of substances such as water on the rolling stock, etc ....

This has the consequence that the rolling stock in the final state again may have a wedging and / or saberiness. However, this can be avoided by incorporating the parameters of the processing units A1, A2, A3,..., AN downstream of the roughing stand 1 into the control of the roughing stand 1. By means of the parameter sets P1, P2, P3,..., PN of the following processing units A1, A2, A3,..., AN, an intermediate state of the rolling stock is determined by means of a model including the initial state S1 and preceding process steps the rolling stock must have in order, after passing through the desired processing units, to achieve a desired final state S3 ', for example wedge-free and saber-free at a certain final thickness.

Starting from the determined intermediate state, the roughing stand 1 is then controlled from the initial state S1 such that the determined intermediate state coincides with the set intermediate state S2 of the rolling stock. Preferably, the set by the Vorgerüst 1 intermediate state S2 is compared with the determined intermediate state and the control changed such that the set intermediate state S2 of the rolling stock and the determined intermediate state for the rolling match as best as possible.

The intermediate state S2 of the rolling stock set after passing through the roughing stand 1 is thus dependent on the process influences of the following processing units A1, A2, A3,..., AN on the rolling stock, which are represented by parameter sets P1, P2, P3,..., PN can be, of the initial state S1 and possibly of process parameters of previous processes that have influenced about the internal stress state of the rolling stock.

For example, by means of a width measuring device and a profile measuring device for a finishing train, which has passed through the rolling stock, an intermediate state can be determined, which to a desired final state -. in this case after the finishing line - leads. For this purpose, wedging and saberiness are measured by means of the abovementioned devices and fed to the control device 4. In conjunction with the differential rolling force known from the prior art, the determined intermediate state for the rolling stock is set from the initial state S1. In general, it is advantageous if the initial state S1 of the rolling stock is known, and this is the control device 4 is supplied so that they can control the Vorgerüst 1 accordingly and / or regulate.

The profile measurement of the rolling stock and the width measurement of the rolling stock can be recorded at various points within the rolling process. Possibly. can therefore be determined individually for each processing unit A1, A2, A3,..., AN whose influence on the geometry of the rolling stock at a given intermediate state or given initial state. The acquired measured values are preferably in a measured value processing Filtered and assigned to the individual tape sections with the aid of tape tracking. The measured values are then available to the process automation, in particular the regulation of the roughing stand 1.

The wedging and / or saberiness of the final state S3 of the rolling stock, for example after passing through the finishing train, depends on the wedging and / or saberiness after the roughing mill or after the roughing stand 1 and further process parameters, in particular the process parameters P1, P2, P3,. ..m PN of the following processing units A1, A2, A3, ..., AN. In order to implement these in the model for regulation of the rough stand 1, a set of selected process parameters P1, P2, P3,..., PN, for example, is supplied to an empirical model, such as an inheritance buffer or neuron network. After a sufficiently large amount of data, the model is able to predict the wedging and / or saberiness of the finished strip as a function of the wedging of the pre-strip. Alternatively, physical models, such as models based on finite elements, or other suitable models may be used. Such models are familiar to the expert.

Based on this information, the rolling stock can be transferred from the initial state S1 to an intermediate state S2 which, after passing through the processing steps provided for the rolling stock, leads to a desired final state S3 which substantially coincides with the desired final state S3 '.

To calculate the required wedging and / or saberiness of the pre-strip, a further model for the downstream processing units A1, A2, A3,..., AN of the rolling stock can be used in order to further optimize the wedging and the saberiness of the finished strip.

FIG. 2 shows the formation of a saber for a wedge-shaped rolling G in a roughing stand 1. In FIG. 2 inlet side is a cross-sectional view GX of a wedge-shaped

Rolled Good G shown. The rolling stock G is conveyed on a roller conveyor 6 to a roughing stand 1. So that this runs in the desired manner in the roughing stand 1, side guides 7 are provided. After the thickness has been reduced by the roughing stand 1, the rolling stock G has a silt caused by the thickness wedge. In the FIG. 2 shown outlet side guide 7 in this case has an open position. This prevents the saber rolling G from hanging on the outlet side guide 7 and the rolling process must be stopped completely.

Since the rolls in the roughing stand 1 are kept substantially parallel by the roll alignment control, the formation of a saber occurs due to the thickness wedge of the rolling stock. The thicker side of the wedge has a higher material flow in the longitudinal direction than the thinner wedge side, resulting in a curvature of the rolling stock in the transport plane of the rolling stock G. Such a band is very difficult to process in subsequent processes.

FIG. 3 also shows a cross section of a wedge-shaped rolling stock, which enters a roughing stand 1. This too is transported by means of a roller conveyor 6 and a side guide 7 to the roughing stand. On the outlet side, a stuffer 8 with two veritikalen work rolls 8 'and a strong side guide 7 is arranged. Through the stuffer 8 and the strong side guide 7, a force is stamped on the outlet side into the rolling stock G.

In particular, it is advantageous if the left-side side guide 7 and the right-hand side guide - viewed in the transport direction of the tape - can be moved independently. In general, this is not the case, since the side guides 7 are symmetrical relative to each other only relative to the band center adjustable. This is ensured by a synchronization shaft of the side guides 7. Advantageously, this is to adjust the intermediate state of the rolling stock or the defined stress distribution in the roll gap Synchronization wave and any other mechanical coupling of the side guides omitted, so that the left and right side guide - at least the outlet side - are independently movable. In particular, it is advantageous to adjust the now independently movable side guides such that the front of the scaffold facing end of the side guide is further away from the center of the band than the front of the scaffold facing away from the side guide 7. That is, the side guide 7 is funnel-shaped adjustable. As a result, the force input to the rolling stock G can additionally be controlled and / or regulated.

Furthermore, a device 11 for detecting the position of the tape head 12 is provided. The use of the stuffer 8 and the side guide 7, the amount of force and the force distribution along the belt is controlled such that at the nip a stress distribution σ adjusting, which allows to set the required intermediate state of the rolling stock G so that the desired final state is achieved by the subsequent processing units.

FIG. 4 shows a roughing stand 1 with a finishing mill following the roughing stand consisting of the five rolling stands A1, A2, A3, A4 and A5, one of the rolling mill downstream band width measuring device 10 and a profile measuring device 9. This in turn is a cooling section A6, which also has a width measuring device 10 and a profile measuring device 9 are arranged downstream. Then the tape is reeled on a reel. The belt width measuring device 10 and the profile measuring device 9 respectively measure the saberiness and the wedging of a belt according to A5 and A6. The wedges and / or saccades determined by means of the width measuring devices 10 and the profile measuring devices 9 are fed to a control and / or regulating device 4, which incorporates the values into the model for determining the intermediate state. Starting from the determined

Intermediate state, the roughing stand is controlled or regulated so that the rolling stock is transferred from its keiligen or wedge-free initial state in an intermediate state, which in turn is converted by processing of the rolling stock by the subsequent processing units A1 to A6 in a desired final state. The final state of the belt is determined in FIG. 4 by the width measuring device or profile measuring device, which is located downstream of the cooling device A6. By doing so, the dispersion of the final state can be further reduced as compared to the prior art, thus further increasing the quality of the finished rolled metal strip.

Claims (13)

1. Method for setting a state (S1, S2, S3) of a rolling stock (G, GX), particularly a near-net strip, which is defined at least by a thickness taper and/or a camber of the rolling stock (G, GX), the rolling stock (G, GX) being transformed from an initial state (S1) into an intermediate state (S2) by rolling by means of a roll stand (1), in particular a roughing stand, and by impressing a stress (σ) onto the rolling stock (G, GX) by means of additional processing means (7, 8), and the rolling stock (G) being transformed from its initial state (S2) into a final state (S3) by means of at least one processing unit (A1, A2, A3,..., AN), characterized in that it is determined whether the at least one processing unit (A1, A2, A3,..., AN) should be fed a rolling stock (G, GX) of an intermediate state that requires a thickness taper and/or camber other than zero in order to achieve a predetermined final state (S3') and, dependent thereon, the roll stand (1) and/or the processing means (7,8) are controlled and/or regulated to set the respectively required intermediate state (S2).
2. Method according to Claim 1, characterized in that allowance is made in the determination for an internal material stressing with an effect at least on the thickness taper and/or camber of the rolling stock (G, GX) during the further processing of the rolling stock (G, GX).
3. Method according to Claim 1 or 2, characterized in that the stress (σ) impressed onto the rolling stock (G, GX) is regulated and/or controlled.
4. Method according to one of Claims 1 to 3, characterized in that a force (F) exerted on the rolling stock (G, GX) is used for impressing the stress (σ) onto the rolling stock (G, GX).
5. Method according to Claim 4, characterized in that the force (F) exerted for impressing the stress (σ) onto the rolling stock (G, GX) is controlled and/or regulated.
6. Method according to Claim 4 or 5, characterized in that the rolling stock has a front side that is generally aligned transversely in relation to an intended transporting direction and is known as the head of the rolling stock, a position of the head of the rolling stock being recorded and the force (F) exerted on the rolling stock (G, GX) being regulated and/or controlled on the basis of the recorded position of the head of the rolling stock.
7. Method according to one of Claims 4 to 6, characterized in that a lateral guide (7) is used as the processing means (7, 8).
8. Method according to one of Claims 4 to 7, characterized in that an edger (8) is used as the processing means (7, 8).
9. Method according to Claim 8, characterized in that working rolls (8') comprised by the edger (8) are not arranged axially symmetrically in relation to a center longitudinal axis of the rolling stock and/or exert forces of different amounts on the rolling stock (G, GX).
10. Method according to one of Claims 1 to 9, characterized in that at least one processing unit (A1, A2, A3,..., AN) following the roll stand (1) is a horizontal roll stand (A1, A2, A3, A4, A5).
11. Controlling and/or regulating device (4) for setting a state (S1, S2, S3) of a rolling stock (G, GX) with a machine-readable program code, which contains controlling commands and/or regulating commands that cause the controlling and/or regulating device (4) to perform the method according to one of Claims 1 to 10.
12. Machine-readable program code for a controlling and/or regulating device (4) for setting a state (S1, S2, S3) of a rolling stock (G, GX), which code contains controlling commands and/or regulating commands that cause the controlling and/or regulating device (4) to perform the method according to one of Claims 1 to 10.
13. Data carrier with a machine-readable program code according to Claim 12 stored on it.

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