EP2391465B1 - Device and method for winding a band having a variable band thickness, particularly a metal band - Google Patents

Description

The invention relates to an apparatus and a method for coiling a band with variable strip thickness, in particular a flat or contoured, a flexibly rolled and / or a profilgewalzten metal strip, in particular steel, to a winding with an applicator for introducing a deformable material on the reeled tape.

A device according to the preamble of claim 1 is for example from the US-A-4298633 known.

Above all, the invention relates to the winding of slit strips. Slit strips arise when strip-shaped material, in particular metallic broadband, drawn from a coil and longitudinally divided into narrow bands, d. H. split, will. The narrow slit strips produced in this way are then wound onto a common mandrel or separate mandrels. Preferably, composite rolls are produced from a multiplicity of adjacent split strips. To compensate for variations in thickness over the width of the strip, which lead to a conical or cambered surface when winding the slit strips, in particular in the edge regions of the strip deposits must be introduced into the winding of the slit strips.

Even when winding split strip material on a continuous drum with several, separated by circular blanks, coaxially juxtaposed Aufwickelhaspeln of slitting lines it comes as a result of different thicknesses and thicknesses more or less tightly wound coils with a correspondingly different tape sag. The Non-uniform winding of the coils has a detrimental effect on their appearance, packaging, drainage behavior and friction between the individual belt windings. To avoid these shortcomings, it is known to wrap paper or cardboard strips of suitable length dimensions between the turns of the slit strips. This often happens because the Paper strip is inserted by hand into the winding slot between the incoming tape and the coil.

From the DE 80 06 563 U1 A device is known for introducing intermediate strips into the winding slot of coils to be wound into coils, in which the paper strip is conveyed by means of a pair of driving rollers in the direction of the winding slot. Here, the storage container for the paper strip as the intermediate layer paper strip containing drum container is formed behind the strip outlet slot which is provided by an electric motor driven roller pair. Behind the pair of driving wheels, a strip separating and perforating device is provided. This allows the Zwischenlegestreifen be injected by the pair of driving wheels at high speed and with simultaneous temporary deformation to a downwardly open, stable air support profile free-floating in the winding slot. The liner strip must be deformed by the roof-shaped profiling of the drive rollers so that it contains a sufficiently stable, carried by the air profile that allows him to shoot over a larger free flight distance in the winding contactor, which exploited at the same time the acceleration effect as well as the air bearing effect becomes.

The interleaving strips are either taken from a stack container containing the strips in appropriate lengths and individually inserted into the coil of the metal strip or withdrawn from a strip supply roll and separated in each necessary wrapping length.

In the EP 0 166 795 B1 For example, there is described a method for winding a plurality of split strips formed by longitudinally dividing band-shaped material onto a common winding mandrel in which the strip-shaped material has a thickness deviation across its width.

The method is characterized in that the slit strips at the same time to a composite winding with a width of all side by side extending Slit strip extending deformable band-shaped insert to be wound up. The thickness of the insert is chosen to be greater than the thickness deviation across the width of the band-shaped material. When winding the slit strips are pressed by exerting a force on the respective uppermost winding layer of the slit strips and / or the insert in the radial direction of the composite coil thicker slit strips stronger than the thinner in the insert and the slit strips by appropriate deformation of the insert to a composite coil with cylindrical Covering surface wound up. According to this method, a non-coated or a coated metallic strip can be wound up as a band-shaped material. As a deformable insert preferably paper, cardboard, plastic, in particular foam, or used with a corrosion inhibitor impregnated paper.

Furthermore, it is known not only to produce flat metal bands, but also those which have contours in the longitudinal and / or transverse direction. In the DE 198 31 882 A1 A method and a rolling mill for producing an arbitrary thickness profile across the width of a strip-shaped rolling stock are described. In this case, the starting material is deformed by a plurality of rollers arranged one behind the other in the rolling direction almost only in the width direction. The rollers allow a locally targeted deformation according to the desired profiling, wherein the penetration depends on the respective employment of the individual narrow rollers or rollers. The starting material is either a ferrous material or a non-ferrous metal; Cold or hot deformation is used.

From the DE 199 62 754 A1 For example, a method for flexibly rolling a metal strip is known. This method is used for the production of flat metal strips, which have different thicknesses defined over their length. In this case, the roll gap is selectively changed during the rolling process in order to achieve different strip thicknesses over the length of the metal strip. On the one hand, this can be done indirectly by changing the deformation resistance of the material by heating or cooling the metal strip and correspondingly changed springing of the roll stand during the rolling process.

Also the EP 1 074 317 A2 relates to a method for flexible rolling of a metal strip, wherein the metal strip is guided during the rolling process through a nip formed between two work rolls and the nip is selectively moved during the rolling process to achieve over the length of the metal strip different strip thicknesses. Here, during each setting of the roll gap or immediately thereafter, the bending lines of the work rolls are controlled depending on the set roll gap to achieve flatness of the metal strip.

It is the object of the invention to improve a device for winding a tape, in particular a flat or contoured, a flexibly rolled and / or a profilgewalzten metal strip, such that in a simple manner, a regular at least substantially cylindrical winding is produced ,

According to the invention, this object is achieved by a device according to claim 1.

According to the invention, in situ according to the requirements of the tape to be wound, ie taking into account its surface condition as well as the expected deviation from the roundness the reel to be coiled, the mating materials used to provide an elastic substance, in particular a solidifying foam, which is introduced into the reel to the extent that a completely or nearly round reel is formed. Thus, the device according to the invention is particularly suitable for winding metallic slit strips, especially steel, but also for other strip materials, such as Plastic, for example thermosets or thermoplastics. The inventively serving as a liner materials protect the tape surfaces and improve the ability to wind. The advantages of uniformly wound coils also exist in the better transportability and in the ease of further processing. Even changes in the thickness of the strip, be it in the longitudinal or in the transverse direction, can be compensated at any time by changing the material order.

Advantageous developments of the invention will become apparent from the dependent claims.

According to the invention it is advantageously provided that the serving as a deposit material is aufgerakelt on the respective uppermost layer of the roll or sprayed from side by side in a row arranged nozzles on the surface of the roll or sprayed. The material, for example, a foamable plastic, can also be sprayed across the width according to the desired application thickness in different thicknesses and individually over certain zones in the width of the roll. Also, in the case of the doctor blade, the doctor blade is set either equidistantly over the entire width of the reel, or it is inclined with respect to the axis of rotation of the reel, adjusted to compensate for an emerging conical winding of the reel.

Preferably, the applicator extends over the entire width of the roll or at least over a large part of the width of the roll. In the latter case, only the critical zones are covered, in which experience shows that irregularities are increased.

In a further advantageous embodiment of the invention, it is provided that the material is applied in strips on the winding. This procedure is used on the one hand to get along with the least possible interlayer material, on the other hand, when applying a radial to the winding acting force the material in the areas between the strips evade to create in this way an optimally round winding.

In another embodiment of the invention, the plastic is advantageously applied from an extruder to the winding.

To increase the elasticity, it is provided that the plastic forms a coherent layer or a plurality of strips adjacent to one another in the strip running direction on the winding, each of which has air inclusions. During foaming, air or another gas is introduced into the hardening plastic according to the desired elasticity in order to compress the insert layer later either under the dead weight of the material to be wound or under the influence of a radially acting contact pressure.

In order to further improve the effect of introducing the material layer, a measuring device for measuring the strip thickness of the metal strip to be wound up can be integrated, which passes on the strip thickness values it has measured to a control device. This wins from the signals representing the strip thickness then a controlled variable to regulate the delivery of material from the nozzles, the addition of a foaming agent, air, and the like. According to the measured strip thickness of the metal strip or adjust in the case of a squeegee their employment to the winding surface.

The invention also relates to a rolling mill for cold or warm disposable or reversible rolling a Metallbandes_mit variable thickness strip, in particular a flat or contoured, a flexibly rolled or profiled rolled metal strip, in particular of steel, with a rolling mill, the one Roller set and a Anstellsystem for adjusting the roll gap, with a roll stand upstream device for unwinding the metal strip to be rolled and a roll stand downstream winding device, as described above. In this case, the metal strip can have all forms of profiles in the longitudinal and / or transverse direction. The tape thickness can change over the length and / or the width.

The rolling mill is inventively characterized in that a control device for controlling the speed of the drives of the two winding devices with a superordinate tail control for compensation or control of the mass flow changes of the rolled strip and the dependent of these strip tension and for controlling the strip tension is present, especially at the times to which the tape acceleration changes as the tape thickness profile changes. The rolling of the strip can also take place in an in-line casting and rolling plant, at the end of which a device for coiling the rolled strip is arranged.

The invention also relates to a method having the features of claim 9.

Advantageously, the method is further configured in that the material is applied to the metal strip with a thickness that is greater than the thickness deviation of the metal strip, and that subsequently to the respective uppermost end of the coil, a force, in particular by means of a roller, is applied to compress the material such that an at least substantially cylindrical composite winding of the metal strip and the material is formed.

In a particularly advantageous manner, the method is carried out so that the material is brought by the addition of an additive shortly before application or during application for swelling or foaming.

Various forms of irradiation, especially just before application or during application, may be employed to aid swelling or foaming and / or curing.

The invention will be explained in more detail in an embodiment. The sole figure shows a cross-wound to a winding tape movable device for spraying foam on the uppermost layer of the coil in the slot between the incoming band and the winding.

An applicator 1 (Figure) for applying or spraying a foamable plastic on a winding 2 of a metal strip 3 comprises a stationary substructure 4. This carries two pairs of bearing blocks 5 for impeller axes 6, on which two pairs of rollers 7 are rotatably mounted. Depending on a pair of successively arranged rollers 7 serves to guide U-shaped guide rails 8, which are connected to a support member 9 for the applicator 1. They are so long that they protrude from the support member 9. The substructure 4 is arranged outside the band region determined by the length of a coiler mandrel 10, so that the applicator 1 optionally travels outside the band region or within the band region in front of the coiler mandrel 10 can be. At the completion of the reeling process, the winding 2 reaches a maximum outer circumference. At the beginning of the reeling operation is a boom 11 for spraying or applying the plastic with the applicator 1 in the dot-dashed position 11 'to the

Apply material close to the surface of the metal strip 3, while it assumes the position 11 "towards the end of the winding process.

The applicator 1 is pivotally arranged relative to the support member 9 by the support member 9 is provided with a pivot axis 12 for two pivot levers 13, which can be pivoted together by a hydraulic actuator 14, the pendulum via a bearing 15 fixed to support tabs 16 of the guide rails 8 is. The Aufbrindvorrichtung 1 is pivotally connected via a pair of tabs 17 and a hinge pin 18 at a free end of the pivot lever 13 and is supported via a pair of rollers 19 on a slotted guide 20 of the support member 9 from.

The applicator 1 comprises a telescopic actuator 21 carried by the pair of tabs 17 for positioning the boom 11 at a suitable distance relative to the surface of the belt 3 or for temporarily removing it from the belt 2, for example for cleaning purposes. The boom 11 includes a preferably replaceable cartridge for applying the application material, which is preferably sprayed from a nozzle 22 or a plurality of in the axial direction of the winding mandrel 10 juxtaposed nozzles 22.

Various substances which are required for the production of the application medium are supplied via at least one supply hose 23, in particular also in conjunction with a pressurized gas, in order to push the substance to be applied out of the cartridge. In addition, a radiator (not shown) may be provided near the nozzles 22, which promotes curing of the applied material.

Instead of a liquid, foamy or viscous material, in particular a plastic, can also be a granulate, in particular in conjunction with a plastic or adhesive, or a quilt-like material, for example, with selectively optimized Teilkissenvolumina, in the winding. 2 bring in to achieve a uniform winding structure. The cushions remain closed as needed, at least in certain areas being filled with suitable materials or media. These can then come out of the cushions under certain pressure or temperature conditions, in particular after completion of the winding process.

According to the invention, the use of a (shown only schematically) pinch roller 24 can be provided, which is arranged in the circumferential direction after the introduction of the foam or the cushion material or granules in the winding 2 and the outer periphery uniformized by compressing the introduced material.

LIST OF REFERENCE NUMBERS

1

applicator

2

reel

3

tape

3 '

Position of the band 3

4

substructure

5

bearing blocks

6

wheel axles

7

castors

8th

guide rails

9

supporting part

10

coiler mandrel

11

boom

11 '

Position of the boom 11

11 "

Position of the boom 11

12

swivel axis

13

pivoting lever

14

servomotor

15

camp

16

support tabs

17

pair of tabs

18

hinge pins

19

roller pair

20

link guide

21

locking device

22

jet

23

supply hose

24

pinch

Claims (12)

1. Device for coiling a strip (3) with variable strip thickness, preferably a flexible rolled and/or a profile-rolled metal strip which is planar or provided with contours, particularly of steel, to form a coil (2), with a coating device (1) for application of a deformable material to the metal strip (3) to be coiled, wherein the coating device (1), comprises means (11, 22) for producing a flexible, particularly a resilient, material or self-swelling or foamable material and for applying, near the surface, the material to the strip (3) during the coiling process, characterised in that a pressing device, particularly a roller (24), is arranged which is suitable for the purpose of exerting a pressing pressure on the coil (2) in order to compress the coil under deformation of the applied material.
2. Device according to claim 1, characterised in that the material can be applied by doctor blade or sprayed or squirted on from nozzles (22).
3. Device according to claim 1 or 2, characterised in that the width of the coating device (1) for coating the material on a coil (2) of a metal strip (3) is constructed so that the coating device (1) extends over the entire width of the coil (2) with the metal strip (3) or at least over a part of the width of the coil (2), which covers only the critical zones with pronounced irregularities in the coiling of the metal strip (3).
4. Device according to any one of claims 1 to 3, characterised in that the material can be coated on the coil (2) in strips.
5. Device according to any one of claims 1 to 4, characterised in that a plastics material can be coated on the coil (2) from an extruder.
6. Device according to any one of claims 1 to 5, characterised in that the means (11, 12) are so constructed that a plastics material to be coated by the means on the strip (3) is formed as a cohesive layer or as a plurality of strips, which lie adjacent to one another in strip running direction, on the coil (2), which each have air inclusions.
7. Device according to claim 2, characterised by the arrangement of a measuring device for measuring the strip thickness of the strip (3) to be coiled and a regulating device for regulating the material output from the nozzles (22) in correspondence with the measured strip thickness of the strip (3).
8. Rolling mill for cold or hot unidirectional or reversing rolling of a metal strip (3) with variable strip thickness, particularly a flexible rolled and/or profile-rolled metal strip which is flat or provided with contours, particularly of steel, with a roll stand, which comprises a roll set and an adjusting system for setting the rolling gap, a device, which is upstream of the roll stand, for uncoiling the metal strip to be rolled and a coiling device, which is arranged downstream of the roll stand, according to any one of claims 1 to 7, characterised in that a regulating device for regulating the rotational speed of the drives of the two coiling devices with a superordinate control unit regulation for compensation for or regulation of the mass flow changes of the rolled strip and the strip tension speed dependent thereon as well as for regulation of the strip tension is present, particularly at the instants at which the strip acceleration changes when a change in the strip thickness profile occurs.
9. Method of coiling a metal strip (3) with variable strip thickness, particularly a flexible rolled and/or a profile-rolled metal strip which is flat or provided with contours, particularly of steel, to form a coil (2), in which during the coiling deformable material is coated by a coating device (1) on the metal strip (3) being coiled to form the coil (2), wherein the deformable material is coated on the surface of the strip (3) from nozzles or by means of at least one doctor blade, characterised in that a pressing pressure is exerted on the coil (2) by a pressing device, particularly a roller (24), and in that case the coil is compressed under deformation of the applied material.
10. Method according to claim 9, characterised in that the material is coated on the material strip (3) with a thickness which is greater than the thickness difference of the metal strip (3) and that subsequently a force is exerted, particularly by means of a roller (24), on the respective uppermost end of the coil (2) in order to so compress the material that an at least substantially cylindrical composite coil (2) of the metal strip (3) and the material arises.
11. Method according to claim 9 or 10, characterised in that the material is caused to swell up or foam up by addition of an additive shortly before the coating or during coating.
12. Method according to claim 11, characterised in that the material is caused to swell up or foam up and/or to harden under irradiation, particularly shortly before the coating and/or during the coating.

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