EP2342026B1 - Rolling apparatus - Google Patents

Abstract

The invention relates to a rolling apparatus (1), comprising at least one upper and one lower roller (2, 3), which are disposed on a common rolling stand (8) and held in bearings that can be displaced vertically to each other for setting different roll nip heights, and each of which is supported by a support roller (4, 5), further comprising at least one axial sliding device for one of the rollers (2, 3), and comprising at least one bending apparatus comprising a bending cylinder (16) for bending the upper roller (3), characterized in that the bending apparatus comprises lateral traverses (12) and bending arms (13) on both ends of the upper roller (3), wherein the roller (3) is guided between the rollers (2, 3) by the bending arms (13) for setting the roll nip height.

Description

The invention relates to a rolling device with at least one upper and one lower, arranged on a common rolling stand and vertically displaceable bearings held to adjust different roll gap heights and each supported by a support roll rolls, with at least one Axialschiebeeinrichtung for one of the rolls and at least a bending device comprising a bending cylinder for bending the upper roller.

Such rolling devices can in particular each contain a plurality of mutually supporting rollers above and below a roll gap, such as a work roll, which comes directly into contact with the rolling stock and in turn rolls on a mostly larger support roll or an intermediate roll, which in turn bears against a support roll. The work rolls and / or the support rolls and / or the intermediate rolls can be axially displaceable relative to each other. In the case of contouring the roll bales of at least two rolls, targeted actions on the shape of the rolling stock passing through the roll gap are possible. The height of the roll gap should be adjustable, which requires a vertical displacement on the framework.

Particularly in the case of a work roll bending device provided in addition to the axial displacement device, it is difficult to ensure this adjustability, even with a large roll rise, that is to say at a high height of the roll gap. This is due to the fact that the integrated into the bending device, with the bending of the gap-limiting rollers to be counteracted integrated locking elements as well as the guide elements for the axial displacement device and the bearings for the rollers in the side rails of the frame have to be adjusted.

From the EP 1 436 104 B1 is a rolling device with at least one axial displacement device is known, with the rolling of thick blocks or slabs, the setting of a large roll tray is made possible. In the known solution, the axial displacement device is integrated in the bearings for a work roll receiving components, so that a separate vertical displacement of the axial displacement device is no longer required.

The axial displacement of the work rolls is realized with a coaxially arranged on a chock of the work roll displacement device, which is moved out when changing the work roll with the set of rolls from the frame. In so-called "flying" work roll bending, the upper work roll chocks rely on bending or balancing cylinders in U-shaped recesses of the upper backup roll chocks. The bending cylinders can be arranged in the work roll chocks or alternatively in the backup roll chocks.

Due to the "flying" arrangement of the upper work roll, a very high roll rise is conceivable. This would also allow the rolling of high blocks on such a roll stand. The Arbeitswalzenverschiebe- and bending devices are moved out when changing the sets of rollers from the mill stand and can be maintained outside of the rolling mill. This eliminates the operator downtime at the plant for the maintenance of these devices.

During the axial displacement of the work roll, the upper work roll set is pushed into the upper backup roll chocks via the balancing pressure applied bending cylinders. The frictional forces that occur produce tilting moments that can cause a skewing of the backup roller chocks. In a sudden loading of the framework with rolling force, the so-called puncture, following the work roll displacement Therefore, it can not be ruled out that there is a high load between the bearing bush and the journal bushing at the backup roller bearing in the case of oil flood bearings or in the case of rolling bearings individual bearing rows experience high stress.

With the known work roll Axialverschiebe- and bending devices, which avoid the above drawback, however, only a roll rise, d. H. the nip for the passage of the rolling stock, to realize about 550 mm.

It is the object of the invention to provide a rolling device with a work roll Axialverschiebe- and bending device, with which a very high roll rise is feasible.

In a rolling device of the type mentioned, this object is achieved in that the bending device comprises at each end of the roller each cross members and bending arms, wherein the roller is guided for adjusting the nip height between the rollers by the bending arms. As a result, it is possible to influence the roll gap contour by a roll axial displacement even with heavy plate stands with typical roll outstages up to about 1100 mm.

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

Advantageously, it is provided that the bending arms are introduced into recesses of the roll stand or the roll stand. Likewise, it can be provided that the bending arms are each guided in guide rails, which are screwed to the rolling stand.

Preferably, the bending arms are guided in the middle region of the roll stands or roll stand spars or surround them.

It is also advantageous if the upper support roller is held at its ends in each case in a backup roll chock. Another measure according to the invention is that the bending cylinders are each arranged vertically to balancing arms for the upper support roller.

In a further development of the invention, the bending cylinders act on the crossbeams which are guided on the balancing arms to the upper support roller and on the guide rails. Advantageously, the bending arms can be detachably connected to the crossbeams or the balancing arms, z. B. in this hang.

Advantageous is an embodiment of the invention, according to which the work rolls are each mounted in work roll chocks and the upper work roll chocks are each acted upon vertically by the bending arms with force. In addition, it can be provided that the bending cylinders belonging to the upper work roll are arranged in lower thickenings of the bending arms.

In addition, it can be provided that the chocks of the lower work roll associated bending or Balancierzylinder are arranged vertically in stationary blocks.

The Axialverschiebemittel are preferably designed as a hydraulic piston-cylinder unit. The actuating element of the Axialverschiebemittel is preferably formed in the form of a piston, wherein the piston is fixed with one of its axial ends on a support arm, which is set on the roll stand in a guide, in particular in a sliding guide, translationally displaceable.

Fig. 1

eine Schnittansicht einer Walzvorrichtung mit jeweils einem Arbeits- und einem Stützwalzenpaar,

Fig. 2

eine Schnittansicht der oberen Arbeitswalze aus Fig. 1 entlang einer Schnittebene A - A,

Fig. 3

eine Schnittansicht der Walzvorrichtung entlang einer Schnittebene B - B aus Fig. 2 und

Fig. 4

eine weitere Schnittansicht entlang einer Schnittlinie C - C aus Fig. 1.

The invention will be explained in more detail in an embodiment. Show it:

Fig. 1

a sectional view of a rolling device, each with a working and a support roller pair,

Fig. 2

a sectional view of the upper work roll off Fig. 1 along a sectional plane A - A,

Fig. 3

a sectional view of the rolling device along a sectional plane B - B from Fig. 2 and

Fig. 4

a further sectional view taken along a section line C - C Fig. 1 ,

A total of 1 ( Fig. 1 . 2 ) is formed as a so-called four-roll stand and comprises two work rolls 2, 3 and two back-up rolls 4, 5. Also, a different number of rolls is possible, for example, the formation of a six-roll stand with additional intermediate rolls, the between the work rolls 2, 3 and the support rollers 4, 5 are arranged. Between the work rolls 2, 3 and the support rollers 4, 5, a roll gap 6 is formed for the material to be rolled. The height 7 of the roll gap 6, the so-called roll rise, is adjustable.

The rolls 2, 3, 4, 5 are in a roll stand 8 ( Fig. 1 . 2 . 4 ) held. The rolling mill 8 receives backup roll chocks 9, 10 supporting the lower and upper backup rolls 4, 5, respectively.

At also from the roll stand 8 recorded guide rails 11 crossbeams 12 are guided. About bending arms 13 of the upper work roll set is carried when the height of the nip 6 is adjusted. At their lower ends are the bending arms 13 with thickenings 14 (FIG. Fig. 3 ) fitted. The crossbeams 12 are guided on Balancierarmen 15; Bending cylinders 16 act on them to bend the upper work roll 3. In a corresponding manner, the lower work roll 2 is bent by a bending cylinder 17. An alternative bending means for bending the upper work roll 3 is indicated at 18.

The bending cylinders 16, 17 and alternatively 18 act on the outer edge regions of the work rolls 2, 3 and practice so in the edge region of the rollers 2, 3 a vertically outwardly from the nip 6 force corresponding to the effective force in the central region of the rolling stock to a bending apart counteract the work rolls 2, 3 by the rolling stock.

In addition to the so-called positive work roll bending over the bending means 16, 17 and alternatively 18, a so-called negative work roll bending over additional piston-cylinder systems 30, 31 can be realized to increase the adjustment range for the profile influencing (s. Fig. 1 ).

Between the backup roll chocks 9, 10 are work roll chocks 19, 20 are arranged, within which the work rolls 2, 3 are mounted.

The Axialverschiebevorrichtungen 21 are arranged at the outer edge regions of the work rolls 2, 3.

The piston 22 of the axial displacement device 21 is arranged via an abutment 25 on retaining arms 24, which are arranged horizontally slidably in the work roll chocks 19, 20. The retaining arms 24 are encompassed by lateral holding devices 29, which are fixed on the outside of the roll stand 8 and prevent horizontal movement of the support arms 24 in the direction of the roll axis 23. Thus, the piston 22 of the axial displacement device 21 is fixed in the axial direction. The holding arms 24 are movable in the lateral holding devices 29 in the vertical direction.

The invention thus relates to a system which allows both the bending and the displacement of the work rolls 2, 3. The vertically arranged in stationary blocks bending or Balancierzylinder 17 are assigned to the lower work roll 2. The bending device of the upper work roll 3 is by two novel components characterized: the cross-beam 12 and the bending arm thirteenth

When adjusting the height of the nip 6, the carrying of the upper work roll set on the bending arms 13. The bending arms 13 are in turn led into strips which are screwed to the roll stand 8, or alternatively in recesses directly to the wheat stands 8. The bending arms 13 be guided in the central region of the roll stand spars or alternatively embrace the roll stand spars.

The bending or Balancierzylinder 16 to the upper work roll 3 are arranged vertically to the Balancierarmen 15 to the upper support roller 5 and move in positioning the upper rollers 3, 5 with the Balancierarmen 15 and thereby require a relatively small stroke, by the Walzenabschliff the upper Rolls 3, 5 is determined.

The bending or Balancierzylinder act on the crossbars 12, which are guided on the Balancierarmen 15 to the upper support roller 5 and the guide rails 11. About the bending arms 13 which are mounted in the crossbeams 12, the chocks to the upper work roll 3 are also applied vertically with force.

In an alternative embodiment of the upper work roll bend, the bending arms 13 are hooked directly into the balancing arms 15. The bending or Balancierzylinder to the upper work roll 3 are arranged in the lower thickenings of the bending arms 13.

The bending arms 13, which ensure a good guidance of the upper work roll chocks even at high roll rise, at the same time take on those frictional forces that would otherwise skew the Stützwalzeneinbaustücke 9, 10 at a Walzen axialverschiebung.

The devices for the axial displacement of the work rolls 2, 3 are arranged on the operating side work roll chocks 19, 20 hydraulically operated piston-cylinder systems 21. Here, each of the piston of the cylinder unit is connected to the guided in the corresponding chocks support arms. Latches, which are arranged on the outside of the two spars of the service-side roll stand, prevent during the rolling operation, a horizontal movement of the holding arms and thus an axial movement of the cylinder piston. By pressurization on the piston side or the rod side of the piston-cylinder unit, an axial displacement of the work rolls 2, 3 mounted in the chocks 19, 20 is realized.

Claims (11)

1. Rolling device (1) with at least one upper roll (3) and at least one lower roll (2), which are arranged on a common roll stand (8) and mounted in bearings vertically displaceable relative to one another for setting different roll gap heights and which are each supported by a backing roll (4, 5), with at least one axial displacing device for one of the rolls (2, 3) and with at least one bending device, which comprises a bending cylinder (16), for bending the upper roll (3), characterised in that the bending device has respective cross members (12) and bending arms (13) at the two ends at the upper roll (3), wherein for setting the roll gap height between the rolls (2, 3) the roll (3) is guided by the bending arms (13).
2. Rolling device (1) according to claim 1, characterised in that the bending arms (13) are mounted in recesses of the roll stand (8) or of the roll housing.
3. Rolling device (1) according to claim 2, characterised in that the bending arms (13) are respectively guided in guide strips (11) which are screw-connected with the roll stand.
4. Rolling device (1) according to claim 2 or 3, characterised in that the bending arms (13) are guided in the middle region of the roll stand or roll housing posts or engage around these.
5. Rolling device (1) according to any one of claims 1 to 4, characterised in that the upper backing roll (5) is held at each of the ends thereof in a respective backing roll chock (10).
6. Rolling device (1) according to any one of claims 1 to 5, characterised in that the bending cylinders (16) are respectively arranged vertically with respect to balancing arms (15) for the upper backing roll (5).
7. Rolling device (1) according to claim 6, characterised in that the bending cylinders (16) act on the cross members (12), which are guided at the balancing arms (15) with respect to the upper backing roll (5) as well as at the guide strips.
8. Rolling device (1) according to any one of claims 1 to 7, characterised in that the bending arms (13) are detachably connected in the cross members (12) or the balancing arms (15).
9. Rolling device (1) according to any one of claims 1 to 8, characterised in that the working rolls (2, 3) are respectively mounted in working roll chocks (19, 20) and that the upper working roll chocks (20) are respectively vertically loaded with force by way of the bending arms (13).
10. Rolling device (1) according to any one of claims 1 to 9, characterised in that the bending cylinders (16) belonging to the upper working roll (3) are arranged in lower thickened portions (14) of the bending arms (13).
11. Rolling device (1) according to any one of claims 1 to 10, characterised in that bending or balancing cylinders (17) associated with the chocks (19) of the lower working roll (2) are vertically arranged in stationary blocks.

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