EP3061535B1 - Reel device with asymmetric cooling of the reeled strip - Google Patents

Description

• wobei das Metallband mittels einer Treibrolleneinheit von einer ersten Transportrichtung in eine zweite Transportrichtung umgelenkt und einem Haspel zugeführt wird,
• wobei das Metallband in dem Haspel zu einem Coil mit einem Coildurchmesser gehaspelt wird,
• wobei eine plastische Verformung eines Endabschnitts des Metallbandes bewirkt wird, so dass der Endabschnitt im einwirkungsfreien Zustand mit einem Krümmungsradius gekrümmt ist,
• wobei die plastische Verformung des Endabschnitts zumindest teilweise durch eine asymmetrische Beaufschlagung der Seiten des Endabschnitts mit einem Kühlmedium vor dem und/oder beim Haspeln des Endabschnitts bewirkt wird.

The present invention relates to a method for reeling a rolled metal strip, in particular a steel strip,

• wherein the metal strip is deflected by means of a drive roller unit from a first transport direction in a second transport direction and fed to a reel,
• wherein the metal strip in the reel is reeled into a coil with a coil diameter,
• wherein a plastic deformation of an end portion of the metal strip is effected, so that the end portion is curved in the non-acting state with a radius of curvature,
• wherein the plastic deformation of the end portion is at least partially effected by an asymmetric loading of the sides of the end portion with a cooling medium before and / or during the reeling of the end portion.

• wobei die Haspeleinrichtung eine Treibrolleneinheit aufweist, mittels derer das Metallband von einer ersten Transportrichtung in eine zweite Transportrichtung umgelenkt wird,
• wobei die Haspeleinrichtung einen Haspel aufweist, dem das Metallband von der Treibrolleneinheit in der zweiten Transportrichtung zugeführt wird und in dem das Metallband zu einem Coil mit einem Coildurchmesser gehaspelt wird,
• wobei die Haspeleinrichtung eine Verformungseinrichtung aufweist, mittels derer eine plastische Verformung eines Endabschnitts des Metallbandes bewirkt wird, so dass der Endabschnitt im einwirkungsfreien Zustand mit einem Krümmungsradius gekrümmt ist,
• wobei die Verformungseinrichtung als Kühleinrichtung ausgebildet ist, mittels derer der Endabschnitt asymmetrisch mit einem Kühlmedium beaufschlagt wird.

Furthermore, the present invention relates to a reel device for reeling a rolled metal strip, in particular a steel strip,

• the reel device having a drive roller unit by means of which the metal strip is deflected from a first transport direction into a second transport direction,
• the reeling device having a reel to which the metal strip is fed by the drive roller unit in the second transport direction and in which the metal strip is reeled into a coil having a coil diameter,
• the reeling device having a deformation device, by means of which a plastic deformation of an end section of the metal strip is effected so that the end section is curved in the non-acting state with a radius of curvature,
• wherein the deformation device is designed as a cooling device, by means of which the end portion is asymmetrically acted upon by a cooling medium.

WO 2011/073 016 A1 forms the basis for the preamble of claims 1 and 5.

In hot strip mills, a metal strip - usually a steel strip - after finish rolling usually first cooled in a cooling section to a predefined temperature (reel temperature). Thereafter, the cooled tape is coiled into a coil. It is possible that the reel temperature is constant over the length of the metal strip. Alternatively, it is possible that the reel temperature
varies over the length of the metal strip seen. For example, the tape head (= front end of the tape) and the tape foot (= rear end of the tape) can be unrolled unrefrigerated. The coiled bundle is then secured for storage and transport against automatic unwinding or popping. In general, the federal government is removed for this purpose with a transport device from the reel and fed to a binding machine. The binding machine is backed up. Before pulling off the reel mandrel, the coiled collar is turned so that the end of the tape protrudes only slightly beyond the lowest point of the coil and thus the bundle is stabilized by its own weight. When reeling the metal strip to the coil usually occurs already a plastic deformation of the metal strip. Nevertheless, in some cases a spontaneous popping up or unrolling of an unsecured federal government may occur. The cause of this are elastic residual stresses in the coils of the coiled federal. The size of these residual stresses depends on several factors, for example the strip thickness and the yield stress at the coiler temperature. In particular, in high-strength grades with a yield stress of about 500 MPa (or more) and a thickness of about 12 mm (or more) such a spontaneous popping or rolling may occur. From the WO 2008/000 348 A1 It is known to pre-bend the end portion of the metal strip by means of a straightening unit. As a straightening unit can according to the WO 2008/000 348 A1 the combination a lower roller and an upper roller of the drive roller unit plus a drive roller unit upstream, engageable with the metal band hold-down roller can be used. Alternatively, a straightening unit upstream or downstream of the driving roller unit can be used as a straightening unit. The upstream or downstream straightening unit comprises in each case three straightening rollers which are sequentially successive and which are set alternately on one and the other side of the metal band, at least one of which is adjustable against the metal band.

From the EP 0 906 797 A1 It is known to arrange between the drive roller unit and the reel a drafting funnel with multiple work rolls, wherein the metal strip is deflected at each work roll. In addition, cooling of the metal strip can take place between the work rolls. By means of the arrangement of EP 0 906 797 A1 In particular, a stress distribution of the metal strip over the bandwidth can be influenced.

The object of the present invention is to provide means by which a plastic deformation of the end portion of the metal strip can be effected in a simple manner.

The object is achieved by a method having the features of claim 1. Advantageous embodiments of the method are the subject of the dependent claims 2 to 4.

According to the invention, a method of the aforementioned type is configured in that the plastic deformation of the end portion is a length of the end portion greater than half of the outermost turn of the coil and smaller than the outermost turn of the coil and is supported by a rebaring unit upstream of the reel, wherein the straightening unit of a combination of a lower roller and an upper roller of the drive roller unit plus one of the drive roller unit upstream, engageable with the metal band hold-down roller consists.

As a result, in the case that the temperature of the end portion at the time when the asymmetric application of the cooling medium takes place is still high enough, it is possible for a tension profile to be impressed into the end portion of the metal strip via the strip thickness. The compensation of this tension profile causes the curvature of the end portion.

The asymmetric loading of the sides of the end section with the cooling medium can be done as required before reeling the end section and / or reeling the end section and / or after reeling the end section. Furthermore, the asymmetrical loading of the sides of the end section with the cooling medium can be carried out as required with a constant coolant quantity, with varying coolant quantity or intermittently.

The extent of asymmetric loading is preferably chosen such that the radius of curvature is at most as large as half the coil diameter. This ensures that the end portion bears under pressure at the next inner turn of the coil. An automatic popping or unwinding of the coil is thereby reliably prevented.

The object is further achieved by a reel device with the features of claim 5. An advantageous embodiment of the reel device is the subject of the dependent claim. 6

The embodiments of the reeling device according to the invention essentially correspond to those of the method according to the invention.

FIG 1

eine Haspeleinrichtung,

FIG 2

ein gehaspeltes Coil und

FIG 3

einen gehaspelten Endabschnitt.

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 are explained in more detail in conjunction with the drawings. Here are shown in a schematic representation:

FIG. 1

a reel device,

FIG. 2

a coiled coil and

FIG. 3

a coiled end section.

As shown in FIG. 1 If a metal strip 1 is to be reeled by means of a reel device. The metal strip 1 may consist of steel. Alternatively, the metal strip 1 may be made of a different metal, such as aluminum or copper. The metal strip 1 has been previously rolled in a rolling mill, not shown, and then cooled in a cooling section, also not shown.

The reel device initially has a drive roller unit 2. The driving roller unit 2 has a lower roller 3 and an upper roller 4. The lower roll 3 is often rigidly arranged. The upper roller 4 is often adjustable to the lower roller 3. This is in FIG. 1 indicated by a double arrow within the upper roller 4. In addition, the upper roller 4 can be displaced horizontally. By means of the drive roller unit 2, the metal strip 1 is deflected from a first transport direction x in a second transport direction y and then fed in the second transport direction y a reel 5 of the coiler. The first transport direction x is usually horizontal. The second transport direction y is directed obliquely downwards in the rule. In the reel 5, the metal strip 1 is coiled to a coil 6. The reel 5 has a coiler mandrel 7. At the beginning of the reeling operation, the coil 6 has an initial diameter d. The initial diameter d corresponds to the diameter of the coiler mandrel 7. During the reeling of the metal strip 1, the diameter of the coil 6 increases until it reaches a final diameter D. The final diameter D corresponds to the coil diameter of the finished coiled coil 6.

In the context of the reel operation is to be achieved that an end portion 8 of the metal strip 1 after reeling such plastically deformed is that he - see FIGS. 2 and 3 - Is curved in the action-free state with a sufficiently small radius of curvature R. The radius of curvature R is preferably at most as large as half the coil diameter D.

To produce the non-impact state, the end portion 8 can be separated from the rest of the coil 6 and then placed on the side edge, so that the end portion 8 can roll freely. In this state, the end portion 8 assumes the radius of curvature R. This - usually fictional - state is in FIG. 3 shown. In practice, the end portion 8 remains part of the coil 6. The end portion 8 must therefore necessarily assume a radius of curvature which is equal to half the coil diameter D. However, the end portion 8 is bent, starting from the non-impact state, elastically outward. It is therefore due to its elastic Aufbiegung under pressure at the next inner turn 9 of the coil 6 at.

The length of the end portion 8 may be determined as needed. Preferably, the length of the end portion 8 is as shown in FIG FIG. 2 In particular, the length of the end portion 8 may correspond to a circumferential angle α of 190 °, 200 °, 210 °, ..., 340 °, 350 ° or less than 360 °. Also intermediate values can be realized, for example 217 ° or 312 °.

In order to achieve such a plastic deformation of the end section 8, the reeling device has a deformation device. By means of the deformation device, the required plastic deformation of the end portion 8 of the metal strip 1 is effected.

The deformation device may comprise a straightening unit, which is arranged upstream of the reel 5. In this case, a plastic deformation of the end section 8 takes place in the straightening unit. The plastic deformation takes place before the end section 8 is reeled by means of the straightening unit.

One possible realization of the straightening unit is that, as shown in FIG FIG. 1 the drive roller unit 2 is preceded by a separate straightening unit 10. This straightening unit 10 is referred to below as the upstream straightening unit.

The upstream directing unit 10 comprises as shown in FIG FIG. 1 at least three straightening rollers 11 to 13. The straightening rollers 11 to 13 follow one another sequentially in the first transport direction x. They are employed alternately on one and the other side of the metal strip 1. The straightening rollers 11 to 13 may be driven individually or in groups. Alternatively, they may be designed without drive. At least one of the straightening rollers 11 to 13 can be adjusted to the metal band 1. For example, the middle straightening roller 12 of the upstream straightening unit 10 can be attached to the metal band 1. This is in FIG. 1 indicated by a double arrow in the middle straightening roller 12 of the upstream straightening unit 10. Alternatively or additionally, the two outer straightening rollers 11, 13 of the upstream straightening unit 10 can be adjusted to the metal band 1. This is in FIG. 1 indicated by a double arrow between the two outer straightening rollers 11, 13 of the upstream straightening unit 10.

As an alternative to the upstream straightening unit 10, it is possible that, as shown in FIG FIG. 1 the drive roller unit 2 is followed by a straightening unit 14. This straightening unit 14 is referred to below as a downstream straightening unit.

The construction and mode of operation of the downstream alignment unit 14 are analogous to the structure and mode of operation of the upstream alignment unit 10. The downstream alignment unit 14 thus comprises, as shown in FIG FIG. 1 at least three straightening rollers 15 to 17. The straightening rollers 15 to 17 follow each other sequentially in the second transport direction y. They are employed alternately on one and the other side of the metal strip 1. The straightening rollers 15 to 17 may be driven individually or in groups. Alternatively, they can be powerless be educated. At least one of the straightening rollers 15 to 17 can be adjusted to the metal band 1. For example, the middle straightening roller 16 of the downstream straightening unit 14 may be adjustable against the metal band 1. This is in FIG. 1 indicated by a double arrow in the middle straightening roller 16 of the downstream straightening unit 14. Alternatively or additionally, the two outer straightening rollers 15, 17 of the downstream straightening unit 14 can be adjusted to the metal band 1. This is in FIG. 1 indicated by a double arrow between the two outer straightening rollers 15, 17 of the downstream straightening unit 14.

As an alternative to providing the upstream or downstream straightening unit 10, 14, it is possible to expand the drive roller unit 2 to a straightening unit. In this case, the straightening unit has a hold-down roller 18 in addition to the lower roller 3 and the upper roller 4 of the driving roller unit 2. The hold-down roller 18 is arranged upstream of the drive roller unit 2. It is adjustable to the metal band 1. This is in FIG. 1 indicated by a double arrow orthogonal to the first transport direction x at the hold-down roller 18. The hold-down roller 18 may additionally be positionable in the first transport direction x. This is in FIG. 1 indicated by a double arrow parallel to the first transport direction x at the hold-down roller 18. However, the positionability in the first transport direction x is not absolutely necessary.

In the case of using a straightening unit is a mechanical-plastic deformation of the end portion 8, which takes place before the reeling of the end portion 8. Regardless of whether one of the straightening units 2 + 18, 10, 14 is present or not, however, always a front and / or a rear cooling device 19, 20 are present. By means of the cooling devices 19, 20, the end section 8 of the metal strip 1 is subjected asymmetrically to a cooling medium 21 (for example water or a water / oil mixture). If only the front and / or the rear cooling device 19, 20 are present, asymmetric loading of the end section 8 with the cooling medium 21 completely brings about the desired plastic deformation of the end section 8. If additionally one of the straightening units 2 + 18, 10, 14 is present, the asymmetrical loading of the end section 8 with the cooling medium 21 partially effects the desired plastic deformation Deformation of the End Section 8. The plastic deformation of the end section 8 is supported in this case by the existing straightening unit 2 + 18, 10, 14.

The front cooling device 19 is arranged in front of the reel 5. By means of the front cooling device 19 takes place an asymmetric loading before reeling. The rear cooling device 20 is arranged in the reel 5. By means of the rear cooling device 20 takes place asymmetric loading during reeling (see FIG. 1 the application to the right of the coil 6) and / or after the reeling (see in FIG. 1 the admission to the left of the coil 6).

It is possible to supply the cooling devices 19, 20 with a constant quantity of coolant, at least during the loading of the end section 8 of the metal strip 1. Alternatively, it is possible that the amount of coolant varies during this period of time. It is also possible to apply the end portion 8 intermittently with the coolant 21.

In FIG. 1 is shown that only the outer side of the end portion 8 is acted upon by the cooling medium 21, both before and behind the capstan unit 2 and in the reel 5. In front of the reel 5, it is alternatively possible, the end portion 8 on the other Side with the cooling medium 21 to apply, but to a lesser extent. It is also possible to carry out the asymmetric application of the cooling medium 21 exclusively in front of or exclusively behind the drive roller unit 2.

In summary, the present invention thus relates to the following facts:
A rolled metal strip 1, in particular a steel strip 1, is deflected by means of a drive roller unit 2 from a first transport direction x in a second transport direction y and fed to a reel 5. In the reel 5, the metal strip 1 is coiled to a coil 6 with a coil diameter D. It is a plastic deformation of an end portion 8 of the metal strip 1 is effected so that the end portion 8 is curved in the non-acting state with a radius of curvature R. The plastic deformation of the end portion 8 is at least partially caused by an asymmetric loading of the sides of the end portion 8 with a cooling medium 21.

The present invention has many advantages. In particular, the desired curvature of the end portion 8 of the metal strip 1 can be achieved in a simple manner and with high reliability.

Although 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 as claimed.

LIST OF REFERENCE NUMBERS

1

metal band

2

Pinch roll unit

3

under Roles

4

top roll

5

reel

6

coil

7

coiler mandrel

8th

end

9

next inner turn

10

upstream judging unit

11 to 13

straightening rollers

14

subordinate straightening unit

15 to 17

straightening rollers

18

Down roller

19

front cooling device

20

rear cooling device

21

cooling medium

d, D

diameter

R

radius of curvature

x, y

transport directions

α

circumferential angle

Claims (6)

1. Method for coiling a rolled metal strip (1), in particular a steel strip (1),

   - wherein the metal strip (1) by means of a drive roller unit (2) is deflected from a first transportation direction (x) to a second transportation direction (y) and is fed to a coiler (5);

   - wherein the metal strip (1) in the coiler (5) is coiled so as to form a coil (6) having a coil diameter (D);

   - wherein a plastic deformation of an end portion (8) of the metal strip (1) is caused such that the end portion (8) in the uninfluenced state is curved at a curvature radius (R) ;

   - wherein the plastic deformation of the end portion (8) is at least partially caused by an asymmetric impingement of the sides of the end portion (8) with a cooling medium (21) prior to and/or during the coiling of the end portion (8),
   characterized in that

   - the plastic deformation of the end portion (8) is a length of the end portion (8) that is larger than half the outermost coiling of the coil (6) and smaller than the outermost coiling of the coil (6), and

   - the plastic deformation of the end portion (8) is supported by means of a straightening unit (2+18) that is upstream of the coiler (5), wherein the straightening unit (2+18) consists of a combination of a bottom roller (3) and of a top roller (4) of the drive roller unit (2) with the addition of a downholding roller (18) that is upstream of the drive roller unit (2) and is capable of being placed on the metal strip (1).
2. Method according to Claim 1,
   characterized in that
   the asymmetric impingement of the sides of the end portion (8) with the cooling medium (21) is performed prior to the coiling of the end portion (8) and/or during the coiling of the end portion (8) and after the coiling of the end portion (8).
3. Method according to either of Claims 1 and 2, characterized in that
   the asymmetric impingement of the sides of the end portion (8) with the cooling medium (21) is performed with a constant quantity of coolant, with a variable quantity of coolant, or in an intermittent manner.
4. Method according to Claim 1, 2, or 3, characterized in that
   the maximum curvature radius (R) is equal to half the coil diameter (D).
5. Coiling installation for coiling a rolled metal strip (1), in particular a steel strip (1),

   - wherein the coiling installation has a drive roller unit (2) by means of which the metal strip (1) is deflected from a first transportation direction (x) to a second transportation direction (y);

   - wherein the coiling installation has a coiler (5) to which the metal strip (1) is fed from the drive roller unit (2) in the second transportation direction (y) and in which the metal strip (1) is coiled so as to form a coil (6) having a coil diameter (D);

   - wherein the coiling installation has a deformation installation by means of which a plastic deformation of an end portion (8) of the metal strip (1) is caused such that the end portion (8) in the uninfluenced state is curved at a curvature radius (R);

   - wherein the deformation installation is configured as a cooling installation (19, 20) by means of which the end portion (8) is asymmetrically impinged with a cooling medium (21) prior to and/or during the coiling of the end portion (8),
   characterized in that

   - the cooling installation is configured such that the impingement of the end portion (8) with the cooling medium (21) is performed across a length of the end portion (8) that is larger than half the outermost coiling of the coil (6) and smaller than the outermost coiling of the coil (6), and

   the coiling installation has a straightening unit (2+18) that for supporting the plastic deformation of the end portion (8) is upstream of the coiler (5) and that comprises a bottom roller (3) and a top roller (4) of the drive roller unit (2) and additionally a downholding roller (18) that is upstream of the drive roller unit (2) and is capable of being placed on the metal strip (1).
6. Coiling installation according to Claim 5, characterized in that
   the cooling installation (19, 20) during the passage of the end portion (8) through the cooling installation (19, 20) is supplied with a constant quantity of coolant, is supplied with a variable quantity of coolant, or is supplied in an intermittent manner.

Images