WO2013156332A1

WO2013156332A1 - Method for producing a strip

Info

Publication number: WO2013156332A1
Application number: PCT/EP2013/057297
Authority: WO
Inventors: Karl Mayrhofer; Gerhard Finstermann; Guoxin Shan; Josef Watzinger
Original assignee: Siemens Vai Metals Technologies Gmbh
Priority date: 2012-04-18
Filing date: 2013-04-08
Publication date: 2013-10-24
Also published as: EP2653241A1

Abstract

In a first rolling pass, a flat metal stock (4) is conveyed in a first roll conveying direction (x) through a roll stand (3) of a rolling mill (2) and is thereby rolled. After the first rolling pass, the metal stock (4) is conveyed in a number of additional rolling passes in a respective additional roll conveying direction through a respective roll stand (3) of the rolling mill (2) and thereby successively rolled into the strip (1). Each additional roll conveying direction runs parallel or anti-parallel to the first roll conveying direction (x) with respect to the metal stock (4). The metal stock (4) has a defined concave thickness profile when seen transversely to the first roll conveying direction (x) prior to the first rolling pass. The concave thickness profile is stamped onto the metal stock (4) while exiting a profiling device (5). The metal stock (4) exits the profiling device (5) in a profiling conveying direction (χ`). The profiling conveying direction (χ`) runs parallel or anti-parallel to the first roll conveying direction (x) with respect to the metal stock (4). The concave thickness profile is stamped onto the metal stock (4) transversely to the profiling conveying direction (χ`) as a thickness profile.

Description

Description / Description

Manufacturing process for a tape

The present invention relates to a manufacturing method for a tape,

wherein a flat rolling stock is conveyed in a first rolling pass in a first rolling conveying direction through a roll stand of a rolling mill and in this case rolled,

wherein the rolling stock is conveyed after the first rolling pass in a number of further rolling passes in a respective further rolling conveying direction in each case through a roll stand of the rolling mill and is thereby rolled successively to the strip,

- Wherein the other rolling conveying directions, based on the rolling stock, in each case run parallel or antiparallel to the first rolling conveying direction.

The present invention further relates to a computer program comprising machine code which can be processed directly by a control computer for a production device for a belt and whose execution by the control computer causes the control computer to operate the production device according to such a production method.

The present invention further relates to a control computer for a production device for a band.

The present invention further relates to a production device for a belt,

- wherein the manufacturing device comprises a rolling mill, which in turn comprises at least one rolling stand for rolling a flat rolling stock,

- wherein the manufacturing device comprises a profiling device,

- Wherein the manufacturing device comprises a rolling mill and the profiling controlling control computer. The above objects are well known. In particular, all customary hot and cold rolling methods for a metal strip are designed in this way. When rolling metal, the flat rolled stock is reduced in thickness and lends itself correspondingly thereto. The width of the flat rolled material remains substantially constant. In general, the length of the rolled rolling stock, so the band, viewed over the width is not constant. In particular, occurs in the middle of the rolled strip usually a slightly greater elongation than at the lateral ends. The rolled strip therefore has on its head and on its band foot convex tongues of tongues, which arise as scrap. The accumulated scrap amount can be up to about 0.4% of the rolling stock used.

From DE 28 14 472 C2 and the corresponding US 4 238 946 A is for plate known (English: plate), the flat rolling initially to roll transverse, then rotate the flat stock by 90 ° and finally to roll the flat rolling longitudinally , In order to avoid the occurrence of band tongues during the longitudinal rolling of the flat rolling stock, a defined thickness profile is impressed on the flat rolled stock during the transverse rolling of the flat rolled stock, which is determined laterally in the subsequent longitudinal rolling.

As seen conveying direction is a corresponding thickness profile. During the embossing of the thickness profile, the rolling stock passes through the rolling stand in a conveying direction which, relative to the rolling stock, extends transversely to the conveying direction during the subsequent longitudinal rolling. The thickness profile can thus be impressed on the rolling stock by appropriately tracking the roll gap. The thickness profile can be concave or convex.

The known from the above DE-Script procedure is only applicable to heavy plate, so if the flat rolling is relatively short, so that it can be first rolled transversely. For a longer flat rolled stock, where, based on the rolling stock, all rolling passes in the same direction (or versierend) and the rolling stock is therefore rolled by 90 ° without rotating the rolling stock, the known from the aforementioned DE-Scripture principle is not applicable. In particular, the length of a slab (English: slab) is often about 10 m, sometimes it is even above 10 m. With such lengths only a longitudinal rolling is possible. A rotation of the rolling stock by 90 ° and subsequent rolling is not possible. The object of the present invention is to provide possibilities by means of which, even with a flat rolling stock, in which the further rolling conveying directions, relative to the rolling stock, run parallel or antiparallel to the first rolling conveying direction, the band tongues are avoided or at least minimized can be significantly reduced.

The object is achieved by a manufacturing method for a belt having the features of claim 1. Advantageous embodiments of the operating method are the subject of dependent claims 2 to 8.

According to the invention, it is provided to design a production method for a strip of the type mentioned at the outset,

that the rolling stock has a defined concave thickness profile transversely to the first rolling conveying direction before the first rolling pass,

- That the concave thickness profile of the rolling stock in one

Profiling device is impressed and

- That the rolling stock having the concave thickness profile runs out of the profiling device in a profiling conveying direction, the profiling conveying direction, relative to the rolling stock, runs parallel or antiparallel to the first rolling conveying direction and the concave thickness profile to the rolling stock as a thickness profile transversely to the profiling conveying direction is impressed.

The production method according to the invention is essentially independent of the thickness of the flat rolled material (= starting material) and the thickness of the strip (= final product). It is thus both applicable when the rolling stock is a slab and the strip is a pre-strip (= pre-strip), as well as when the rolling stock is a slab and the strip is a finished strip, as well as when the rolling stock a Vorband is and the tape is a finished tape. Also, the rolling stock may be a (not yet cut to length) cast strand.

Slabs generally have a relatively large thickness, typically 100 mm and more, usually even more than 150 mm. Vorband usually has a thickness between 20 mm and 80 mm. Prefabricated strip usually has a thickness which is between 0.5 mm and a few mm, in extreme cases up to 10 mm.

The production process according to the invention should, if possible, avoid the occurrence of scrap on the tape head and on the belt foot. The concave thickness profile is therefore preferably determined such that the band has neither a convex band tongue at its band head nor at its band foot. Alternatively, in the sense of a sub-optimal solution, which nevertheless represents an improvement over the prior art, it is possible for a convex tongue to remain or for ligaments to remain, but for the remaining ligaments to be significantly smaller than in a conventional manufacturing method of the prior art ,

It is possible that the profiling device is formed as part of a continuous casting device. In this case, for example, the casting mold itself may already have a corresponding concave cross section. Alternatively, the corresponding profiling can take place in one or more roller segments of the casting device.

Alternatively, it is possible that the profiling device is designed as a rolling device. In this case, the rolling device can, for example, in the case that the concave thickness profile impressed the still hot flat flat rolling is, in front of the flame cutting machine (English: torch cutting machine) of the casting device may be arranged. Alternatively, it may be a rolling mill directly upstream rolling device. It is even possible to use the rolling stand (in the case of several rolling stands, the first rolling stand) of the rolling mill as a profiler.

Due to the low rolling forces required, it will usually be sufficient in the first two cases, the corresponding rolling device exclusively with

To equip work rolls (2-high, Duo roll stand), ie without additional support rollers. Additional rolls are not excluded. It is possible that the profiling device is designed as an uncontrolled device with respect to the concave thickness profile. Preferably, however, the profiling device is designed as a controllable with respect to the concave thickness profile device. Because in this case it is possible that based on output data of the rolling stock and stitch plan data of the strip in conjunction with geometric data of the rolling mill on the basis of a rolling model a Sollkonkavität is determined and the

Profiling device is set such that a deviation of the concave thickness profile is minimized by the Sollkonkavität. As a result, in particular the accumulated scrap amount can be minimized according to plan.

The controllability of the concave thickness profile has significant advantages. Thus, it is possible, for example, after the production of the strip-by measurement or manually-to determine a degree of a band tongue occurring at the band head and / or band foot of the band, that the occurring band tongues are compared with corresponding reference tongues, and that the rolling model is determined by comparison of FIG occurring ligaments with the appropriate Sollzungen is adapted. For example, a corresponding model error can be classified according to material properties and pass schedule and assigned to the corresponding type of rolling stock. This allows the Adjustment of the concave thickness profile in the sense of a manual or online adaptation of flat rolling stock to flat rolling stock to be further improved. Furthermore, it is possible-as an alternative or in addition to adapting the rolling model-that the setting of the profiling device during the runout of the rolling stock from the profiling device is varied so that the concave thickness profile varies over the length of the rolling stock. As a result, for example, the concave thickness profile for

Belt foot and head are individually optimized and - viewed in the longitudinal direction = conveying direction of the rolling stock - are gradually transferred from the optimal for the tape head concave thickness profile in the optimum for the band foot concave thickness profile. Other approaches are possible.

The manufacturing method according to the invention is particularly advantageous if the rolling stock as the rolling mill

cut to length, seen in length and width substantially rectangular rolling stock - in particular as cuboid rolling - is supplied.

The object of the invention is further achieved by a computer program of the type mentioned. The computer program is designed in this case such that the

Control computer operates the manufacturing device according to a manufacturing method according to the invention.

The object is further achieved by a control computer for a production device for a belt, which is designed such that it operates the production device according to a manufacturing method according to the invention.

The object is further achieved in a production device for a band of the type mentioned above in that the control computer is designed according to the invention and operates the production device according to a manufacturing method according to the invention. The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in more detail in conjunction with the drawings. Here are shown in a schematic representation:

1 shows a production device for a belt, FIG. 2 shows a rolling stock in cross-section,

3 shows a band in plan view,

4 shows a band in plan view,

5 to 17 possible embodiments of

Profiliereinrichtungen,

18 shows a rolling mill with upstream

profiling,

FIGS. 19 and 20 are flowcharts and

21 to 23 perspective views of rolling stock.

In the following, the general principle of the present invention will be explained in connection with FIG. It should be noted in advance that the term "rolling stock" is always used for the precursor before the rolling of the rolling stock and during the rolling of the rolling stock, the term "strip" for the end product resulting from the rolling.

According to FIG. 1, a production device for a strip 1 comprises a rolling mill 2. The rolling mill 2 in turn comprises at least one rolling stand 3. According to the illustration of FIG. 1, three roll stands 3 are present purely by way of example. If a plurality of roll stands 3 are present, however, there are generally four to eight rolling stands 3, usually five, six or seven rolling stands 3. The rolling stands 3 of the rolling mill 2 have further rolls in addition to work rolls as shown in FIG. in particular back-up rolls (4-high) and possibly also intermediate rolls (6-high). In the rolling mill 2, a flat rolling stock 4 is conveyed in a first rolling pass in a first rolling conveying direction x through a rolling stand 3 of the rolling mill 2 and in this case rolled. If the rolling mill 2 has a plurality of rolling stands 3, as shown in FIG. 1, the rolling stands 3 pass through the rolling stock 4 in succession. Each rolling stand 3 carries out a respective rolling pass, so that the rolling stock 4 is rolled successively to the strip 1. In each rolling pass, the rolling stock 4 passes through the rolling stand 3 executing the respective rolling pass in a respective rolling conveying direction, the respective rolling conveying direction coinciding with the direction of the first rolling pass, that is, the first rolling conveying direction x. The further rolling conveying directions are thus parallel to the first rolling conveying direction x (non-reversing rolling).

Due to the fact that the rolling stock 4 passes through the rolling stands 3 in succession and each roll stand 3 executes its rolling pass only after the respective upstream roll stand 3, the further rolling passes are carried out after the first roll pass.

If the rolling mill 2 has only one single rolling stand 3 (or in individual cases two rolling stands 3), a reversing rolling usually takes place in the rolling mill 2. The rolling stock 4 is therefore stopped after the first rolling pass, the conveying direction reversed, the rolling stock 4 again - this time against the first rolling conveyance x - promoted by the rolling stand 3 (or the two rolling stands 3), then again the rolling stock 4 stopped and the Conveying direction again reversed and so on until all necessary rolling passes are executed, the rolling stock 4 has thus been rolled successively to the belt 1. In the case of a reversing roll, therefore, the further rolling passes are likewise carried out after the first pass. The rolling conveyance directions of the first, third, fifth, etc. roll passes are parallel to each other. Likewise, the rolling conveying directions of the second, fourth, sixth, etc. rolling Engraving parallel to each other. However, the rolling conveyance directions of the straight rolling passes are in anti-parallel to the rolling conveyance directions of the odd rolling passes. The manufacturing device further comprises - in addition to the rolling mill 2 - serving as a profiling rolling device 5. The profiling is upstream of the rolling mill 2 as shown in FIG 1. In the profiling the rolling stock 4 - see FIG 2 - a defined concave thickness profile K impressed, ie a concave thickness profile K, the course in the width direction of the rolling stock 4 is known in advance. The impressing of the thickness profile K is in this case essentially connected to a material crossflow, with a material longitudinal flow not at all or only to a small extent.

Due to the impressing of the concave thickness profile K, the rolling stock 4 has the corresponding concave thickness profile K before the first rolling pass, viewed transversely to the first rolling conveying direction x. 2 shows by way of example and greatly exaggerated a possible concave thickness profile K.

The rolling stock 4 runs according to FIG. 1 in a profiling conveying direction x 'from the profiling device. The rolling stock 4 already has the concave thickness profile K at this point in time, that is, when leaving the profiling device. The profiling conveying direction x 'extends, with respect to the rolling stock 4, parallel (alternatively: antiparallel) to the first rolling conveying direction x. The concave thickness profile K is thus already impressed on the flat rolling stock 4 in the profiling device as a thickness profile transverse to the profiling conveying direction x ', ie in the form of the thickness as a function of the location in the width direction of the flat rolling stock 4. As already mentioned, the profiling device according to the representation of FIG. 1 is arranged upstream of the rolling mill 2. However, this is not mandatory. The profiling could alternatively (in the case of a reversing mill) with the roll stand 3 or (in the case of a multi-stand rolling train) to be identical to the first rolling stand 3 of the rolling mill 2.

According to FIG. 1, the profiling device is furthermore designed as a rolling device 5. Again, this is not mandatory. This will be explained in more detail later in conjunction with further FIG.

If the profiling device is designed as a rolling device 5, it usually executes two stitches. The first of these two stitches serves as a calibration pass to compensate for any thickness inaccuracies of the incoming flat rolling stock 4. The second of these two stitches is used to impress the desired concave thickness profile K. The rolling device 5 can for this purpose according to the illustration of FIG 1 have two stands.

The manufacturing device furthermore has a control computer 6. The control computer 6 controls (at least) the rolling mill 2 and the profiling device. The control computer 6 is designed such that it operates the manufacturing device according to the above-explained procedure. For example, the control computer 6 may be designed for this purpose as a software programmable device which is programmed with a computer program 7. In this case, the computer program 7 comprises machine code 8, which can be processed directly by the control computer 6. The processing of the machine code 8 by the control computer 6 causes the corresponding operation of the manufacturing device by the control computer. 6

The computer program 7 can be supplied to the control computer 6 in any manner, for example via a connection to a computer network or via a mobile data carrier 9, on which the computer program 7 is stored in (exclusively) machine-readable form. The mobile data carrier 9 is in FIG. 1 is shown as a USB memory stick. However, this illustration is only an example.

Due to the rolling of the rolling stock 4 in the rolling mill 2, the rolled strip 1 has a considerably smaller thickness d (see also FIG. 3) than the rolling stock 4, which has a thickness D (see also FIG. 2). Correspondingly, the strip 1 according to FIG. 3 has a considerably greater length 1 than the rolling stock 4 whose length is designated L in FIG. The width b of the band 1, however, is equal to or at least approximately equal to the width B of the rolling stock. 4

If the cross section of the rolling stock 4 were purely rectangular - indicated by dashed lines in FIG. 2 - or the cross section even had a convex shape, then the band head 1 'and the band head would have the same shape

Band foot 1 "of the band 1 band tongues 10 which extend substantially over the entire width b of the band 1 and extend substantially convex.The (unwanted) band tongues 10 are indicated by dashed lines in Figure 3. Due to the concave thickness profile K, the band tongues However, with a suitable choice of the concave thickness profile K, the band tongues 10 can be avoided both on the band head 1 'and on the band foot 1 ". It is regarded as optimal according to current knowledge if small residual tongues 11 form in the corners of the band 1, see FIG. 4, or the band 1 has a slightly concave shape (indicated by broken lines in FIG. 4).

The extent of the concavity of the concave thickness profile K can be readily determined experimentally. In particular, it can be estimated on the basis of experience in a first approximation. If - purely by way of example - it is known that the flat rolling stock 4 is formed as a (tongueless) slab having a thickness D of 203 mm, a width B of 1280 mm and a length L of 11,900 mm and a band 1 a Vorband be rolled with a thickness d of 25 mm and a width b of 1280 mm, so form in a manufacturing method of the prior art in the Rule strip tongues 10 with a tongue length δ1 of about 220 mm. Based on these numbers, the maximum thickness reduction δD of the slab can be determined according to the relationship δD = d · δd / L = 25 · 220/11900 mm ≈ 0046 mm. If the width B of the rolling stock 4 and the width b of the band 1 deviate from one another, the thickness reduction δD must still be scaled with the ratio of the widths b, B to one another.

In the above relationship, it has been assumed that the concavity is distributed evenly on both sides and over the entire length L of the flat rolled material 1. However, this is not mandatory. In particular, a strong concavity can be compensated on the one hand by a weaker concavity on the other side and vice versa. In extreme cases, it may even be sufficient to impress the concave thickness profile K only on a single side of the flat rolling stock 4 in the flat rolling stock 4. This can have manufacturing advantages.

The contour of the concave thickness profile K can be mathematically approximated as needed. For example, the contour can be set as a second order symmetric parabola or as a higher order symmetric parabola - especially fourth, sixth, etc. order. Alternatively, for example, an approach by a polygon is possible. Other curves are also possible, such as trigonometric functions, exponential or logarithmic functions, Chebyshev polynomials and others.

According to the above numerical example, the flat rolled stock 4 is formed as a slab (thickness D = 100 mm ... 300 mm), the strip 1 as a preliminary strip (thickness d = 20 mm ... 80 mm). The opening band is often referred to as pre-strip. In this case, the rolling mill 2 is formed as a pure roughing. Most of the roughing road is here as a reversing mill with or without Upset frame formed. Alternatively, the rolling stock 4 could already be formed as a preliminary strip (thickness D = 20 mm ... 80 mm). In this case, the band 1 as a finished strip (thickness d = 0.5 mm ... 10 mm, usually 0.8 mm ... 2.0 mm) is formed. The rolling mill 2 is designed in this case as a pure finishing line. The finishing train is usually designed as a multi-stand rolling train, in which the individual rolling stands 3 are traversed by the flat rolling stock 4 successively and always in the same conveying direction x.

It is even possible that the rolling stock 4 is formed as a slab, the band 1 as a finished strip. In this case, the rolling mill 2 is designed as a combined rolling mill, which has a roughing train and a finishing train downstream of the roughing train. For example, reversing rolling can take place in the roughing mill, and non-reverting rolling in the finishing mill.

Subsequently, various possibilities are outlined in connection with FIGS. 5 to 16, by means of which the defined concave thickness profile K can be impressed on the rolling stock 4. In FIGS. 5 to 16, the dot-dash line always denotes the center plane of the rolling stock 4 or of the cast strand 13.

For example, according to FIGS. 5 to 10-as an alternative to the embodiment of FIG

Profiling device is designed as part of a strand casting device. For example, according to FIG. 6, a continuous casting mold 12 itself may have a corresponding concave profile, so that the metal strand 13 emerging from the continuous casting mold 12 already has the corresponding concave thickness profile K. Alternatively or additionally, it is possible, according to the illustration of FIG. 7, to use roller segments 14 of the continuous casting device as profiling device. This procedure can be particularly advantageous if the conversion Forming of the cast strand 13 is carried out in an area in which the cast strand 13 is not or only just solidified, so the deformation takes place in a region of the cast strand 13 in which this still has a liquid core or just no liquid core ,

In the event that the profiling device is designed as a roller segment 14 of the continuous casting device, different configurations of the roller segments 14 are also possible. For example, it is possible for the roller segments 14 to have a plurality of rollers 14 'as shown in FIGS. 7 to 10. In the embodiment according to FIG. 7, the outer rollers 14 'taper outwards. Shown in FIG. 7 is a linear taper. Alternatively, the taper could not be linear.

Alternatively or in addition to tapering the outer rollers 14 ', the roller axes 14 "of the outer rollers 14' may form an angle with the roller axes 14" of the middle roller 14 '(or middle rollers 14'). This is shown in FIG.

FIGS. 7 and 8 show rigid configurations of the roller segments 14 in which, with the exception of the total adjustment of the respective roller segment 14 (see FIG. 9), no further adjustment possibilities are provided. Alternatively, it is possible that the angle that the roller axles 14 "form with each other is adjustable.

In the case of the formation of the profiling device as a rolling device 5, this can be arranged according to FIG 12 within the pouring device, but even before the torch cutting machine (TCM) of the casting device. In this case, the concave thickness profile K is impressed on the flat rolling stock 4 by means of the rolling device 5. Also, this rolling device 5 may - in analogy to FIG 1 - have two rolling stands. FIGS. 13 to 17 show possible configurations of rollers 15 of the rolling device 5. According to FIG. 13, it is possible, for example, that the rollers 15 of the corresponding rolling device 5 are mounted axially non-displaceably and are cambered in a suitable manner. Alternatively, the rollers 15 may have a reversed point contour and be arranged axially displaceable. This is shown schematically in FIG. The corresponding embodiment is also possible if the rolling stock 4 is formed as a slab, the rolling device 5 thus has one or two roughing stands. Again alternatively, the rollers 15 - with or without axial displaceability - according to FIGS 15 to 17 on one side have a reduced diameter. The

Diameter reduction can be uniform linear (FIG. 15), in each case linear (traverse, FIG. 16) or not linear (FIG. 17). In this case, FIGS. 16 and 17 show only the respectively relevant part of a single roller 15. In the case of a non-linear design, the corresponding contour can be circular-arc-shaped, for example. Non-circular configurations are also possible. In particular, a clothoid may be an advantage.

Alternatively or additionally - this is not shown in the FIG - the rollers 15 can be pivoted against each other, so that the axes of rotation of the rollers 15 are each pivotable in a direction parallel to the conveying direction x 'and Walzgutbreitenrichtung plane, wherein the

Pivoting movements in opposite directions to each other.

Regardless of which of the configurations of the rolling device 5 is selected, it is possible for the rolling device 5 to be designed as a rolling stand having only two rolls 15-namely the working rolls 15. Other rolls, which are usually found in rolling mills for flat rolled goods, can be eliminated. However, embodiments with more than two rollers 15 are also possible.

As an alternative to an arrangement of the rolling device 5 in front of the flame cutting machine of the casting device, it is alternatively possible according to FIG. 18 (see also FIG

Profiling device 5 form as a rolling device 5, which is the upstream of the rolling mill 2 or part of the rolling mill 2 is. In this case, the rolling device 5 in particular between an input side

Furnace 16 - for example, a blast furnace or a walking beam furnace - and the first rolling stand 3 of the rolling mill 2 may be arranged. For the embodiment of the rolling device 5 of FIG. 18, the above explanations regarding FIGS. 13 to 17 apply in an analogous manner. Again, the rolling device 5 may comprise two rolling stands.

It is possible that the profiling device 5, 12, 14 with respect to the concave thickness profile K is designed as a non-controllable device. For example, in the case of the embodiment of the profiling device according to FIG. 6, it can be possible as continuous casting mold 12 that the width B of the cast rolling stock 4 is adjustable, but neither its thickness D nor the profile of the concave thickness profile K can be adjusted. Preferably, however, it is possible to adjust the concave thickness profile K, be it statically before the start of the profiling process for a specific rolling stock 4, be it dynamically during the profiling operation, ie. H. during embossing of the concave thickness profile K into the respective rolling stock 4. Preferably, therefore, the profiling device is designed with respect to the concave thickness profile K as a controllable device.

For example, in the case of the embodiment according to FIG. 13, the setting of the rollers 15 can be adjusted to one another, in the case of FIGS. 14 to 17, in addition to the employment, the axial displacement of the rollers 15 relative to one another. Furthermore, by means of only locally acting on the rollers 15 cooling devices (not shown in the FIG), for example, locally the profile of the rollers 15 are influenced. Analogous embodiments apply to an arrangement of the rolling device 5 in front of the flame cutting machine of the casting device and for an arrangement immediately before or in the rolling mill 2. Also controllability is given if the profiling is adjustable by the roller segments 14 of the continuous casting device.

If the profiling device 5 is designed as a controllable with respect to the concave thickness profile K device, the control computer 6 shown in FIG 19 - see FIG 1 - in a step Sl output data of the rolling stock 4 and stitch plan data of the belt 1 fed. The output data of the rolling stock 4 may include, for example, its thickness D, its length L, its width B, its temperature T (possibly also temperature distribution), its chemical composition C, etc. The stitch plan data of the strip 1 may in particular include its nominal dimensions (length 1, width b, thickness d) and implicitly or explicitly reference tongues which the rolled strip 1 should have, the respective stitch decreases, rolling temperatures and rolling forces etc. expected for the individual rolling passes , As a rule, with regard to the band tongues 10, the implicit assumption that convex band tongues 10 are to be avoided is still sufficient. Furthermore, the control computer 6 is usually supplied with geometric data of the rolling mill 2 (profiles of the rolls of the rolling stands 3, etc.).

Based on the output data of the rolling stock 4 and the stitch plan data of the belt 1, the control computer 6 determines in a step S2 on the basis of a rolling model 17 (see FIG. 1)

(Ideal) Sollkonkavität for the flat rolling stock 4. The rolling model 17 can, for example, as an empirical model, as on mathematical /

physical equation-based model, be designed as a neural network, etc. The rolling model 17 usually comprises two partial models. In the first part model is based on the given shape of the rolling stock 4 in conjunction with the other known data, the geometric shape of the Schopfenden of the resulting band 1 determined. In the second part model, the required concavity of the rolling stock 4 is determined on the basis of the geometric shape of the Schopfenden of the resulting strip 1, which at least approximates the shape of the strip 1 of a desired form.

In a step S3, the control computer 6 determines setting parameters P of the profiling device. The determination of the adjustment parameters P is such that a deviation of the resulting concave thickness profile K of the ideal

Sollkonkavität is minimized. For example, the mean square error over the rolling stock width B or the maximum error over the rolling stock width B can be minimized. In a step S4, the control computer 6 sets the profiling device 5 in accordance with the setting parameters P determined in step S3.

It is possible that the procedure of steps S2 and S3 is performed uniformly for the entire rolling stock 4. Alternatively, it is possible to separately determine the steps S2 and S3 according to FIG. 20 for the band tongues 10 on the band head 1 'and on the band foot 1 "and to determine their own adjustment parameters P for the profiling device 5. In this case, the control computer 6 varies according to FIG During adjustment of the rolling stock 4 from the profiling device, the adjustment parameters P are varied, thereby varying the concave thickness profile K over the length L of the rolling stock 4. For example, the control computer 6 can adjust the setting parameters P during the runout of the rolling stock 4

Profiling device 5 linearly or non-linearly from the set parameters determined for the tape head 1 'P in the determined for the band foot 1 "setting parameters P. Figures 21 to 23 show - purely by way of example - a few ways to vary the concave thickness profile K.

According to FIG. 21, in a first section A1, the maximum thickness reduction ΔD is linearly reduced from an initial value to zero. Then, in a second section A2, it remains constant at the value 0 and then increases again in a third section A3 until it reaches its final value. The initial value and the end value may be the same or different. Also, the lengths of the first portion AI and the third portion A3 may be the same or different.

According to FIG. 22, a further section A4 is present in front of the first section A1 in which the initial value of the maximum thickness reduction ΔD is kept constant. A similar portion (not shown in FIG. 22) may follow the third portion A3.

According to FIG. 23, analogous to FIG. 22, the first, second, third and further sections A1 to A4 are present. According to FIG. 23, in the first and in the third section, however, not only is the maximum thickness reduction δD reduced towards the second section, but additionally a reduction in the width of the concave thickness profile K towards the second section A2.

As already mentioned, the embodiments of FIGS. 21 to 23 are purely exemplary. There are also other variations possible.

If the profiling device is designed as a controllable device with respect to the concave thickness profile K, it is preferably by means of a corresponding measuring device 18 (see FIG. 1) -for example a multicellular CCD camera-or manually after the production of the strip 1 (ie after the last pass pass ) determines a degree of the real band tongues 10 occurring on the band head 1 'and / or on the band foot 1 ", preferably including the contour thereof.This can - see Figures 19 and 20 - the control computer 6 in a step S5 to take the corresponding measurements and the extent of the real band tongues 10. In this case, preferably by the control computer 6, alternatively intellectually from a human - in a step S6, the occurring real ligature tongues 10 compared with the Sollzungen. Based on the comparison, the rolling model 17 is adapted in the context of step S6.

Steps S5 and S6 are only optional. They are therefore shown in FIGS 19 and 20 only dashed.

The production method according to the invention is always usable in principle. However, the production method according to the invention exhibits its strengths, in particular, when the rolling stock 4 is fed to the rolling mill 2 as a cut-to-length rolled stock 4, seen in length L and width B. For this purpose, the profiling device may be preceded or followed by a corresponding separating device 19 (see FIG. 1), for example a flame cutting machine or a crop shear. If the rolling stock 4 is a slab and the strip 1 is a preliminary strip and, in addition, the preliminary strip is to be reused later as a rolling stock 4 for a further production method according to the invention, in which the rolled stock 4 is a preliminary strip and the strip 1 is a finished strip, a corresponding cropping shear can also be arranged on the outlet side of the rolling mill 2. The present invention has significant advantages over the prior art. In particular, the

Scrap share in the manufacture of the band can be significantly reduced, for example, from about 0.35% to less than 0.1%. The saving of scrap results in a productivity increase as well as considerable cost and energy minimization.

While the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. LIST OF REFERENCE NUMBERS

1 band

1 'tape head

1 "band foot

2 rolling mill

3 rolling stands

4 flat rolling stock

5 rolling device

6 control computer

7 computer program

8 machine code

9 data carrier

10 tongues

11 remaining tongues

12 continuous casting mold

13 cast strand

14 roller segments

14 'rolls

14 "roller axles

15 rolls

16 oven

17 rolling model

18 measuring device

19 separating device

A1 to A4 sections

b, B widths

C chemical composition d, D thicknesses

K concave thickness profile l, L lengths

P setting parameter

S1 to S6 steps

T temperature

x, x 'conveying directions δD thickness reduction δ1 tongue length

Claims

Claims / Patent Claims

1. Manufacturing Method for a Tape (1),

- Wherein a flat rolling stock (4) in a first rolling pass in a first rolling conveying direction (x) by a rolling stand

(3) a rolling mill (2) is conveyed and thereby rolled,

- The rolling stock (4) after the first rolling pass in a number of further rolling passes in a respective further Walz- conveying direction in each case by a rolling stand (3) of the rolling mill (2) is promoted and thereby rolled successively to the belt (1) becomes,

- Wherein the other rolling conveying directions, based on the rolling stock (4), respectively parallel or anti-parallel to the first

Rolling conveying direction (x) run,

wherein the rolling stock (4) has a defined concave thickness profile (K) transversely to the first rolling conveying direction (x) before the first rolling pass,

wherein the concave thickness profile (K) is impressed on the rolling stock (4) in a profiling device (5, 12, 14),

- Where the concave thickness profile (K) having rolling

(4) in a profiling conveying direction (x ') from the

Profiling device (5, 12, 14) terminates, the profiling conveying direction (x '), relative to the rolling stock (4), parallel or anti-parallel to the first rolling conveying direction (x) and the concave thickness profile (K) the rolling stock (4 ) is embossed as a thickness profile transversely to the profiling-conveying direction (x ').

2. Production method according to claim 1,

characterized ,

that the rolling stock (4) is a slab or a cast strand and the strip (1) is a preliminary strip or that the rolling stock (4) is a slab or cast strand and the strip (1) is a finished strip or that the rolled stock (4) is an opening band and the band (1) is a finished band.

3. The manufacturing method according to claim 1 or 2, d a a c e c o v e n c e c e n e,

the concave thickness profile (K) is determined in such a way that the band (1) has neither a convex band tongue (10) on its band head (1 ') nor on its band foot (1 ").

4. Production method according to claim 1, 2 or 3,

characterized ,

the profiling device is designed as a component (12, 14) of a continuous casting device or as a rolling device (5).

5. Manufacturing method according to one of the above claims, d a d e c o v e c e n e c e n e,

in that the profiling device (5, 12, 14) is designed as controllable with respect to the concave thickness profile (K), that based on output data of the rolling stock (4) and stitch plan data of the strip (1) in conjunction with geometric data of the rolling mill (2) using a Roll model (17) a Sollkonkavität is determined and that the

Profiling device (5, 12, 14) is set such that a deviation of the concave thickness profile (K) is minimized by the Sollkonkavität.

6. Production method according to claim 5,

characterized ,

that after the production of the strip (1), a degree of a strip tongue (10) occurring at the strip head (1 ') and / or strip foot (1 ") of the strip (1) is determined by measurement or manually that the strip tongues (10) appear with appropriate

Sollzungen be compared and that the rolling model (17) on the basis of the comparison of the occurring band tongues (10) is adapted to the corresponding Sollzungen.

7. Production method according to claim 5 or 6,

characterized ,

that the setting of the profiling (5, 12, 14) during the run-out of the rolling stock (4) from the Profiling device (5, 12, 14) is varied so that the concave thickness profile (K) over the length (L) of the rolling stock (4) varies.

8. A method of manufacture according to any one of the preceding claims, characterized in that:

in that the rolling stock (4) is fed to the rolling mill (2) as a cut-to-length, substantially rectangular rolling stock viewed in length (L) and width (B).

9. computer program, the machine code (8), which is directly abarbeitbar by a control computer (6) for a production device for a tape (1) and its processing by the control computer (6) causes the control computer (6) the Manufacturing device according to a manufacturing method with all steps of a manufacturing method according to one of the above claims operates.

10. control computer for a production device for a belt (1),

characterized ,

in that the control computer is designed such that it operates the production device in accordance with a production method with all steps of a production method according to one of claims 1 to 8.

11. Manufacturing device for a band (1),

- wherein the production device comprises a rolling mill (2), which in turn comprises at least one rolling stand (3) for rolling a flat rolling stock (4),

wherein the manufacturing device comprises profiling means (5, 12, 14),

- wherein the manufacturing device comprises a rolling mill (2) and the profiling device (5, 12, 14) controlling the control computer (6),

characterized ,

in that the control computer (6) is designed according to claim 10 and the production device is manufactured according to a manufacturing method. Drive with all steps of a manufacturing method according to one of claims 1 to 8 operates.