EP1420903B1 - Method and device for winding a thin metal strip, especially a hot rolled or cold rolled thin steel strip - Google Patents

Abstract

A device for coiling thin metal strip, especially hot-rolled or cold-rolled thin steel strip, includes a drivable coiler mandrel which can be adjusted in diameter by expandable segments and can be adjusted to a coil inside diameter and to a diameter for detaching the finished coil. The device further includes an expansion adapter which can be inserted into the open eye of the coil and is mounted on a holder with a guide.

Description

The invention relates to a method and apparatus for reeling thin metal strip, in particular of hot or cold rolled thin steel strip, on a reel mandrel which is adjusted in diameter, wherein at the beginning of the coil inner turns are wound on the set coiler mandrel diameter and after the coiler is pulled out or the coil is pulled off when the coil is finished.

High-quality hot rolled thin steel strip has recently been produced in larger quantities and is approaching the amounts and thicknesses of cold rolled steel strip. The reason is great progress in the rolling technology of hot-rolled flat strip. It is currently economical to produce very thin ultra-thin gauges of less than 2 mm in ever larger quantities.

Since the rolling mills are capable of producing such thin hot flat products, the following machines, e.g. the roller table, the belt cooling, the reel, the federal transport u. Like. Meet the new requirements.

A problem during and after winding thin steel bands is that the coil inner coils loosen and collapse. A later mounting of the coil on a reel mandrel of the unwinding machine or a further processing machine is not possible or only with additional effort. The coil inner turns must be cut out of the coil eye by hand. This manual work reduces the productivity of the plant.

It is known (US 5,705,782), a spot welding machine, which is arranged on a holding device with guide to introduce into the coil eye and to set by means of electrodes, the welding points on the coil inner winding.

The problem of collapse of the inner coil begins with increasing decrease in belt thickness. An influence is also exerted by parameters such as e.g. Material properties, reel temperature and bandwidth off. In this case, the metal strip no longer has sufficient inherent rigidity and falls due to its own weight in the coil inner opening (coil eye) and thereby reduces the coil inner diameter. The problem occurs immediately after winding and removal of the coil from the coiler mandrel and is further enhanced by the further transport to the release of several internal turns. In cold rolling and winding of thin steel strip, the aforementioned spot welding method or tacking is applied to a sleeve by welding or by winding.

It is known (JP 50 113 456 A) to introduce profile elevations and profile depressions as holes and lobes by means of punching at one point of the circumference for connecting adjacent inner turns. For a diameter-adjustable coiler mandrel, such holes and lobes forming hooks are cumbersome, if not dangerous. In addition, the connection is only at one point of the circumference.

The invention has for its object to prevent the loosening of individual turns in the coil eye by stiffening turns.

The stated object is achieved by the method of claim 1.

As a result, the first turn (s) are / are stiffened in such a way that the end of the strap can again support itself and individual turns can not be released. It is sufficient to profile just a little more than an inner turn. It is by no means necessary to profile more than 2 - 3 turns.

Advantageously, the tread grooves are pressed over the provided with profile beads, rotationally driven reel dome.

Furthermore, the impressions of the profiles during the circulation of the metal strip can take place.

Another embodiment provides that after winding the first turn on the reel mandrel, a post-spreading occurs and the tread grooves are pressed with a band and material-dependent force in the inner turns. As a result, neither the previous operation nor the design of the coiler mandrel are changed significantly.

The method can be advantageously applied to strip thicknesses of the order of 0.4 to 1.8 mm.

The associated device for winding thin metal strip, in particular of hot or cold rolled thin steel strip, with a drivable coiler mandrel adjustable by means of expandable segments in diameter and adjustable to a winding inner diameter and a diameter for loosening the finished coil, solves the Asked task according to the invention in that the segments are provided with segment-shaped profile beads. These profile beads press through the coiler mandrel lead or a Nachspreizvorgang in the metal strip, forming therein grooves that lead beads similar to a stiffening of the grooved inner turns. The profile beads are designed according to the necessary plastic metal band deformation and need not form any obstruction when pulling the coil from the coiler mandrel. As a result, no additional machine is required, but only one additional function to the reel dome. When impressing the grooves, no damage to the strip edges takes place by welding or bonding. Existing plants can be easily retrofitted. There are only small investment costs required. In downstream plants, no changes need to be made.

In an embodiment of this device it is provided that the segment-shaped profile beads are interchangeable and can be adapted to the metal strip in width and height.

In this case, the width and the height of the profile beads depending on the strip thickness and the material properties can be fixed according to a further advantage.

In the drawings, embodiments of the invention are shown, which are explained in more detail below.

Fig. 1

eine Seitenansicht einer kompletten Haspelvorrichtung mit Transport-Rollgang,

Fig. 2

ein fertiges Coil in perspektivischer Ansicht,

Fig. 3

einen perspektivischen Schnitt durch das Coil mit der Einzelheit "A" einer vergrößerten Innenwindung,

Fig. 4

eine perspektivische Ansicht eines Haspeldorns.

Show it:

Fig. 1

a side view of a complete reel device with transport roller table,

Fig. 2

a finished coil in perspective view,

Fig. 3

a perspective section through the coil with the detail "A" of an enlarged inner winding,

Fig. 4

a perspective view of a coiler mandrel.

According to FIG. 1, thin metal strip 1, in particular thin steel strip, is wound on a roller table 2 in a coiler station 3 onto a reel mandrel 3 a, the metal strip 1 being shaped and wound by means of deflection shells 7 via a pair of driver rollers 4 and guides 5 and 6. The Umlenkschalen 7 and pressure rollers 8 by means of adjusting cylinders 9, the position sensor 10 have controlled, adjustable.

In the end, the coil 11 is formed as shown in FIG. 2. In the coiler station 3, which is connected, for example, a hot strip mill rolling mill, the coil 11 is formed on the reel mandrel 3 a in such a way that the incoming with rolling speed (warm) metal strip 1 on the Pressure rollers 8 and the pulleys 7 is wound around the reel mandrel 3 a, wherein the metal strip 1 is guided around by means of hydraulically on the adjusting cylinder 9 and the position sensor 10, so that a first inner coil 12 is formed with a strip beginning 13. The diameter of the reel mandrel 3 a is usually adjustable via four movable segments 3 b mounted on the circumference of the coiler mandrel 3 a.

The reel dome has a maximum and a minimum diameter, which is preset with mechanical stops. The wrap phase begins with a mean diameter, i. From this position of the segments 3b can be done on the one hand a retraction for the purpose of rapid construction of the frictional engagement between the reel mandrel 3b and the metal strip 1, on the other hand, the reel mandrel 3a can be despread to remove the coil 11 from the reel mandrel 3a.

In the Anwickelphase the pressure rollers 8 and the reel mandrel 3 a rotate at a higher speed (so-called. Advance) than the incoming metal strip 1. The first inner coil 12 is placed around the pre-spread reel mandrel 3 a and begins to tighten on the reel mandrel 3 a. The first inner turn 12 tends to fall with the beginning of the strip 13 below the inner diameter 14 of the coil eye 15.

This collapse is now to be eliminated. The process is as follows: The Nachspreizphase begins and the segments 3b are pressed with a dependent of the metal strip 1 and its material force in the first inner coil 12.

For this purpose (FIGS. 3 and 4) profiled beads 16 are respectively attached to the segments 3b of the coiler mandrel 3a and form circumferential protrusions. With the overfeed or the Nachspreizvorgang push the profile beads 16 with tread grooves 17 (Fig. 3) in the metal strip 1 a. In this case, a profile groove 17 can impress into the second inner turn 18, as can be seen in the enlarged detail A of FIG. 3. As a result, the inner coils 12 give themselves and 18 together stiffer and prevent the tendencies of collapse shown in Figure 2.

The segment-shaped profile beads 17 may be designed to be interchangeable and vary in width and height, ie, each adapted to the metal strip 1. Apart from the strip thickness, the material properties of the metal strip 1 are decisive for the adaptation.

LIST OF REFERENCE NUMBERS

1

metal band

2

roller table

3

coiling station

3a

coiler mandrel

3b

segment

4

Pair of drive rolls

5

guide

6

guide

7

Umtenkschale

8th

capstan

9

Adjusting cylinder

10

locator

11

coil

12

first inner turn

13

A tape

14

Inner diameter

15

Coil-eye

16

profile ridges

17

tread groove

18

second inner turn

29

tape end

30

Outer diameter of the coil

Claims (7)

1. Method of reeling up thin metal strip (1), particularly hot-rolled or cold-rolled thin steel strip, on a reeling mandrel (3a), which is adjusted in diameter, wherein at the beginning the coil inner windings (12) are wound on the set reeling mandrel diameter and after winding of the coil (11) to finished state the reeling mandrel (3a) is withdrawn or the coil (11) is pulled off, wherein one or more profile elevations or profile depressions are introduced at the circumference in one or in several mutually adjacent inner windings (12), characterised in that as profile elevations or profile depressions profile grooves (17) are impressed over the circumference by the rotationally driven reeling mandrel (3a), which is provided with profile beads (16), during winding of the metal strip (1).
2. Method according to claim 1, characterised in that one or more profile grooves (17) are impressed into one or more mutually adjacent inner windings (12) at the circumference by way of the rotationally driven reeling mandrel (3a), which is provided with profile beads (16), during the rotation.
3. Method according to one of claims 1 and 2, characterised in that after winding the first winding (12) on the reeling mandrel (3a) a subsequent spreading is carried out and the profile grooves (17) are impressed into the inner windings (12) by a force dependent on strip and material.
4. Method according to one of claims 1 to 3, characterised in that strip thicknesses in the order of magnitude of 0.4 to 1.8 millimetres are processed.
5. Device for reeling thin metal strip (1), particularly hot-rolled or cold-rolled thin steel strip, by a drivable reeling mandrel (3a), which is adjustable in diameter by means of spreadable segments (3b) and is settable to a winding inner diameter (14) and to a diameter for release of the finished coil (11), characterised in that the segments (3b) are provided with segment-shaped profile beads (16).
6. Device according to claim 5, characterised in that segment-shaped profile beads (16) are exchangeable and are adaptable in width and height to the metal strip (1).
7. Device according to one of claims 5 and 6 , characterised in that the width and height of the profile beads (16) can be fixed in dependence on the strip thickness and the material properties.

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