EP3618979B1 - Roll stand for rolling a metal product - Google Patents

Description

The invention relates to a roll stand for rolling a metallic material with two work rolls, which are mounted by means of respective work roll chocks in the roll stand, with axial displacement means are arranged with which the work rolls can be moved in the direction of their longitudinal axis, with at least one work roll lock is arranged with which the Work roll chocks can be locked and unlocked in the roll stand and with which the axial displacement means can be prevented from rotating about the longitudinal axis of the work rolls, and bending means are arranged which comprise a bending block and with which a bending moment can be applied to the work rolls.

Such a roll stand is, for example, from EP 1 648 626 B1 known. The basic structure of such a roll stand is shown in Figure 1 reproduced. The roll stand 1 shown here has two work rolls arranged one above the other, which are mounted in respective work roll chocks 2. Axial displacement means 3 are provided for the axial displacement of the work rolls, ie for displacement in the direction of their longitudinal axis. In order to apply a bending moment to the work rolls in order to influence the roll gap, bending cylinders 12 are arranged in a bending block 5 (for the upper and the lower work roll together). To move the work rolls in the roll stand or roll stand, a detachable connection between the work roll chocks 2 of the rolls to be displaced and the displacement device 3 as such is necessary. This releasable connection is referred to as a work roll lock 4. The locking or unlocking takes place by moving a tab which is moved by movement means 8.

The roll stand 1 thus comprises a bending and shifting system for the work rolls with work roll locking. The axial displacement means (Displacement device) are attached in the direction of the longitudinal axis of the work roll in front of the bending blocks, either directly on the roll stand or on the bending blocks.

So that the work rolls can be moved along their longitudinal axis, a connection must be established between the actual displacement device and the work roll chock. On the one hand, this connection must be stable in order to enable displacement under rolling and bending force; on the other hand, it must also be detachable for the purpose of changing the rollers. This connection is made by the work roll lock 4. With the lock, the said tab is swiveled into a lateral recess of the roll chock around the axis of the shifting device via a usually hydraulically operated lever connection, thus establishing a connection between the shifting mechanism and the chock. The task of the additional anti-rotation device 11 is to keep the position of the displacement device rotationally stable. In the previously known solution, the anti-rotation device 11 is attached to the roll stand, even if the axial displacement means 3 are attached to the bending block itself.

The fastening of the anti-rotation device on the roll stand results in various disadvantages, in particular when the associated axial displacement means are fastened to the bending block. Under the aspect that each of the mentioned devices is located 4 times in the individual roll stand due to the symmetry of the roll stand (entry and exit side for each upper and lower roll), these actually represent minor disadvantages (for example in a 7-stand finishing train) overall is a relevant factor:
In the previously known solution, the anti-rotation device is fastened to the roll stand by means of a guide block with a plug-on bolt and a fastening screw. For this it is necessary to attach the roll stand to this The site has to be milled smooth, which requires an expensive machining step in the production.

The final assembly and adjustment of the parts on the stand can only be done on site, as the separate fastenings on the shifting cylinder and roller stand mean that no pre-assembly is possible. Accordingly, the assembly periods are disadvantageously extended.

The installation and removal of a bending block is relatively difficult because, for example, to install a block in the stand, the recess in the stand and the two anti-rotation locks of the respective block must be hit at the same time, while the displacement device without the anti-rotation lock has no rotationally stable position.

Furthermore, when a block is removed, the sliding device itself can be damaged or personnel can be injured by turning over the sliding device after "leaving the anti-rotation device".

The guide surfaces at the attachment points to the roll stand must be lubricated. For grease lubrication, around two open lubrication points with "loss lubrication" are required for each anti-twist device, i.e. a total of eight open grease lubrication points per roll stand. This leads to the escape of grease, which contaminates the environment and the cooling water and possibly leads to burn marks on the strip surface to be rolled.

The accessibility of the media connections and the routing of the lines are made more difficult by the anti-rotation device mounted on the roller stand.

The invention is based on the object of developing a roll stand of the type mentioned in such a way that the above-mentioned disadvantages can be reduced or eliminated, so that advantages in the manufacture and operation of the Rolling mill can be achieved. In particular, simple assembly and advantages in the lubrication of the roll stand are sought. A simpler structure of the arrangement and improved lubrication options for the components to be lubricated are thus to be achieved.

The solution to this problem by the invention is characterized in that the anti-rotation device and the axial displacement means are firmly connected to the bending block.

The anti-rotation device, the axial displacement means and the bending block preferably form an integral unit.

The connection between the anti-twist device, axial displacement means and bending block is preferably designed as a screw connection.

Usually two axial displacement means arranged one above the other are attached to the bending block.

The work roll lock is connected to the shifting device so that they form an operative connection.

The work roll lock preferably comprises at least one tab which is arranged to be movable in a direction transverse to the direction of the longitudinal axis of the work rolls. Movement means with which the tab can be moved are preferably arranged.

A further development provides that a releasable transport lock is present, which can be placed between the axial displacement means and the bending block and fixed there in order to prevent displacement of the axial displacement means relative to the bending block.

A (central) media access is preferably formed on the bending block. Here it can be provided that from the media access an access for the medium leads to the work roll lock, to the axial displacement means and to the bending block. The media access is preferably connected with fixed piping.

The proposed solution is accordingly based centrally on the fact that the anti-rotation device is fastened together with the axial displacement means (displacement device) on the bending block. Thus, according to the proposed solution, an integrated anti-rotation device is provided for axially displaceable rollers.

This relatively simple structural change results in a surprising number of advantages with regard to the manufacture, assembly, commissioning and maintenance of the roll stand. As a result, the proposed solution is also very suitable for modernizing and retrofitting existing systems.

The proposed solution can be used, for example, for flat rolling metallic strips in which the rollers are arranged displaceably along their longitudinal axis, in particular on hot flat rolling mills. In general, however, it is also suitable for all other types of rollers.

Fig. 1

einen Teil eines Walzgerüsts, gesehen in Richtung der Längsachse der Arbeitswalzen, wobei die Lösung nach dem Stand der Technik dargestellt ist,

Fig. 2

einen Teil eines Walzgerüsts, gesehen in Richtung der Längsachse der Arbeitswalzen, wobei eine Ausführungsform der Erfindung dargestellt ist,

Fig. 3

in perspektivischer Darstellung einen Teil des Walzgerüsts nach der Ausführungsform der Erfindung gemäß Figur 2,

Fig. 4

in perspektivischer Darstellung einen vergrößerten Abschnitt aus Figur 3, wobei die Anordnung einer Transportsicherung dargestellt ist, und

Fig. 5

in perspektivischer Darstellung einen Abschnitt des Walzgerüsts, wobei ein Medienzugang dargestellt ist.

Exemplary embodiments of the invention are shown in the drawing. Show it:

Fig. 1

a part of a roll stand, seen in the direction of the longitudinal axis of the work rolls, the solution according to the prior art being shown,

Fig. 2

a part of a roll stand, seen in the direction of the longitudinal axis of the work rolls, an embodiment of the invention being shown,

Fig. 3

in a perspective view a part of the roll stand according to the embodiment of the invention according to Figure 2 ,

Fig. 4

an enlarged section in a perspective view Figure 3 , the arrangement of a transport lock is shown, and

Fig. 5

a perspective view of a section of the roll stand, wherein a media access is shown.

In the Figures 2 and 3 a roll stand 1 is shown, which in principle has the same elements as those described above in connection with the discussion of the prior art (see Figure 1 ) were explained. Accordingly, the work rolls (not shown) are mounted in respective work roll chocks 2, the work roll chocks 2 being arranged in the roll stand 13 of the roll stand 1. Axial displacement means 3 are provided for displacing the work rolls in the direction of their longitudinal axis.

The work roll lock 4 establishes a connection between the axial displacement means 3 and the roll chock. For this purpose, a tab 7 can be moved into a corresponding recess in the chock 2 by means of a (hydraulic) movement means 8 for the purpose of locking.

Furthermore, there is a bending block 5 in which bending cylinders 12 are arranged in order to be able to exert a bending moment on the work rolls in a known manner in order to influence the contour of the roll gap.

The design of the axial displacement means as a hydraulic cylinder usually requires a round external shape of the axial displacement means. To avoid undesired rotation, it must be supported against another component using the anti-twist device. According to the invention, the axial displacement means is supported by the anti-twist device against the bending block. Therefor a screw connection is provided, by means of which an integral unit is produced from the aforementioned elements anti-rotation device 4, axial displacement means 3 and bending block 5. This can be pre-assembled in the factory and then taken to the place of use. A surface treatment of the outside of the roll stand is no longer necessary.

Said connection of the anti-rotation device 6 on the bending block 5 via the screw connection is preferably carried out jointly for the upper and lower work roll, just as the bending block 5 has the respective bending cylinders 12 for the upper and lower work roll.

The bearing points are grouped together to reduce open lubrication points. This measure can generally reduce the number of lubrication points and also the number of open lubrication points. From the Figures 2 and 3 it can be seen that the bearing point is now closed, expediently with a round guide, that is, there is only 4 times 1 closed bearing point per roll stand. With a sealed round guide, this means that the bearing point is maintenance-free and therefore 4 times 2, i.e. 8 lubrication points with loss lubrication are eliminated.

A transport lock 9 can be provided for the integral unit consisting of axial displacement means (displacement device), (work roll lock), anti-rotation lock and bending block, as shown in FIG Figure 4 is illustrated. The transport lock 9 fixes the displacement device in a defined position relative to the bending block. Damage or injuries from moving parts can thus be avoided.

Another advantageous embodiment or effect of the proposed solution results from Figure 5 . It can be seen here that there is improved accessibility to the media connections, which results from the elimination of the attachment to the roll stand. A central media access 10 to the Bending block 5 and thus also for the displacement device, for locking and for anti-twist protection is possible. This also enables fixed piping of all connections. Potential leakage points are reduced, the tubing of the roll stand can be done much more easily.

This results in a significant simplification of the entire device, which results in significant advantages in manufacture, assembly on the construction site and, in particular, in the maintenance of the roll stand.

List of reference symbols:

1

Roll stand

2

Work roll chock

3

Axial displacement means

4th

Work roll lock

5

Bending block

6

Anti-twist device

7th

Tab

8th

Means of Movement

9

Transport lock

10

Media access

11

Attachment of the anti-twist device to the roll stand

12

Bending cylinder

13th

Roll stand

Claims (8)

1. Roll stand (1) for rolling a metallic material, with two work rolls which are mounted in the roll stand (1) by means of respective work roll chocks (2),
   wherein axial displacing means (3), by which the work rolls can be displaced in the direction of the longitudinal axis thereof, are arranged,
   wherein at least one work roll locking means (4), by which the work roll chocks (2) are lockable and unlockable in the roll stand (3), are arranged and
   wherein rotation securing means (6), by which the axial displacing means (3) can be prevented from rotation about the longitudinal axis of the work rolls, are arranged, and
   wherein bending means, which comprise a bending block (5) and by which a bending moment can be applied to the work rolls, are arranged,
   characterised in that
   the work roll locking means (4), the rotation securing means (6) and the axial displacing means (3) are fixedly connected with the bending block (5).
2. Roll stand according to claim 1, characterised in that the rotation securing means (6), the axial displacing means (3) and the bending block (5) form an integral unit.
3. Roll stand according to claim 1 or 2, characterised in that the connection between work roll locking means (4), axial displacing means (3) and bending block (5) is constructed as a screw connection.
4. Roll stand according to any one of claims 1 to 3, characterised in that two axial displacing means (3) arranged one above the other are fastened to the bending block (5).
5. Roll stand according to any one of claims 1 to 4, characterised in that detachable transport securing means (9), which can be placed between the axial displacing means (3) and the bending block (5) and fixed thereat so as to prevent displacement of the axial displacing means (3) relative to the bending block (5), are present.
6. Roll stand according to any one of claims 1 to 5, characterised in that a media access (10) is formed at the bending block (5).
7. Roll stand according to claim 6, characterised in that an access for medium for the work roll locking means (4) leads from the media access (10) to the axial displacing means (3) and the bending block (5).
8. Roll stand according to claim 6 or 7, characterised in that the media access (10) is connected with fixed pipework.

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