EP2307152B1 - Rolling device - Google Patents

Description

The invention relates to a rolling device with at least two work rolls, which are each mounted by means of at least one work roll chock in a rolling mill, wherein at least one of the work rolls in the rolling stand for setting a desired roll gap relative to the other work roll, in particular in the vertical direction, is adjustable, wherein Axialverschiebemittel are provided, with which a work roll can be moved relative to the rolling stand in its axial direction, wherein the Axialverschiebmittel having an actuator which is arranged coaxially to the axis of the displaceable work roll, and wherein at least one work roll is in operative connection with bending means, with which this a bending moment can be applied.

A rolling device of this kind is for example from the EP 1 436 104 B1 known. The rolling apparatus disclosed therein is equipped with axial displacement means so that the work rolls can be moved to and held in a desired axial position along their axial extent. The axial displacement means constructed as a hydraulic piston-cylinder system comprise a piston fixed at one of its ends to a support arm which can slide up and down the rolling stand in the vertical direction, together with the work roll chock.

Furthermore, the previously known rolling device comprises bending means with which the work roll can be subjected to a bending moment. The bending means are supported between the chock of the work roll and the chock of the adjacent support rolls. With small movements of the lower work roll in the vertical direction, the bending means are supported between the chocks of the lower work roll and thickening of bars of the roll stand.

At from the EP 1 436 104 B1 Prior art design of rolling devices so the work roll displacement is realized with a coaxially arranged on the work roll chock Axialverschiebevorrichtung, which is moved out during the work roll change with the set of rolls from the rolling mill. The work roll bender is "on-the-fly" in which the upper work roll chocks are supported by the bending and 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.

It is advantageous in this design that due to the "flying" arrangement of the upper work rolls, a large roll rise (eg up to 1,200 mm) is possible. This allows the rolling of high blocks on such a rolling stand. Furthermore, the work roll shifting and bending devices can be moved out of the rolling stand when changing the sets of rollers and maintained outside of the rolling stand. This eliminates the operator downtime at the plant for the maintenance of these devices.

Because of the coaxial arrangement on the sets of rollers, the axial displacement devices do not need to take up any tilting moments otherwise to be considered in displacement systems which are stationarily mounted on the rolling stand. This has a positive effect on the dimensioning of the displacement devices, since a lower displacement force is needed.

The disadvantage of this design, however, is that during the work roll axial displacement of the upper set of work rolls is pushed over the applied with Balancierdruck bending cylinder of the upper support roll chocks. The frictional forces that occur produce tilting moments that can cause a skewing of the backup roller chocks. In a sudden loading of the skeleton with the rolling force ("puncture") following the work roll displacement can therefore not be excluded be that there is a local contact of bearing bush and pin bushing at the support roller bearing - in oil flood bearings, which can cause bearing damage due to edge pressure or that in the case of rolling bearings individual rows of bearings undergo excessive stress.

The publication WO 2005/011885 A1 relates to a rolling device with at least two work rolls, which are each mounted by means of work roll chocks in a rolling stand, wherein at least one of the work rolls in the rolling stand for setting a desired roll gap relative to the other at the work roll, in particular in the vertical direction, is adjustable. For this axial displacement means are provided which are mounted in the form of two piston-cylinder units in parallel next to the work roll to be displaced, thus offset in height to the longitudinal axis of the rolling stand.

The publication EP 1 772 203 A1 describes a rolling device for rolling in a rolling stand, with at least one hydraulically actuable piston, which is arranged in a bending block.

The publication EP 0 267 420 A2 relates to a rolling stand with a device for the axial displacement of engageable rollers, with piston-cylinder units, which are arranged laterally next to the work roll on the stand spar of the roll stand.

From the publication EP 0 340 504 A2 is a bending and balancing device for axially displaceable rolls of a rolling stand with a device for axially moving the rollers known.

The roll chocks are supported on both sides on a guide block vertically guided upper or lower lifting horizontally slidably.

Also known are bending devices which are constructed in the manner of a "bending hood". This is a work roll bending system in which hydraulic blocks are provided with so-called "bending hoods" which ensure good guidance of the work roll chocks in the roll stand even at high roll emergence and at the same time enable the relevant work roll to be displaced.

The device for the axial displacement of the work rolls is attached to one of the two roll stand. Each lateral support part ("displacement tube") of the respective work roll chocks is assigned a displacement cylinder unit. In these sliding cylinder units, the work roll chocks are slidably mounted in the vertical direction.

The advantage of this design is that roll up to 550 mm can be realized. By using the "bending hood" no further moments are introduced into the backup roller bearings when moving the work rolls. A further advantage is that no additional coupling of media hoses is required because the bending and displacement devices can be permanently piped.

A disadvantage of this concept, however, that because of the arrangement of the displacement outside of the stator post and the requirement that the forces occurring in the rolling process must be absorbed by the displacement device even at high rolling, resulting in a sweeping and thus heavy and expensive design of the displacement device ,

The invention is therefore based on the object to provide a rolling device of the type mentioned, which avoids the disadvantage of the first-mentioned type and makes the benefits of the solution discussed below available. So it should avoid the high weight of the last discussed solution and a more cost-effective design can be achieved. It should be possible to realize a high roll rise.

This object is achieved in that the work roll chock for receiving the force generated by the bending means seen from the axis of the work roll side cantilevered arms, wherein between a pressure force generating element of the bending means, in particular a piston, and the cantilever arm of the work roll chock a is arranged relative to the rolling stand, in particular in the vertical direction, displaceable pressure transmitting element.

The Axialverschiebemittel are 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.

The compressive force generating element of the bending means and the cantilever arm of the work roll chock are positioned so that the center axis of the pressure force generating element intersects the cantilevered arm.

Between the pressure force generating element of the bending means and the pressure transmission element and / or between the pressure transmission element and the cantilever arm of the work roll chock, a sliding surface is preferably arranged.

The bending means are advantageously arranged in a block fixedly arranged on the roll stand, and the pressure transmission element is mounted on the block by means of a guide, in particular by means of a vertical guide. The pressure-transmitting element is preferably U-shaped in a horizontal section and surrounds the block at least partially from three sides. The pressure-transmitting element is preferably L-shaped in a vertical section perpendicular to the axis of the work roll and at least partially surrounds the block on its upper side.

The pressure transmission element can be mounted on the rolling stand by means of a guide, in particular by means of a vertical guide.

Holding means can be arranged between the block and the pressure transmission element, which hold the pressure transmission element immovable in the horizontal direction to the work roll on the block.

According to the invention, it follows that an axial displacement device is used, which is arranged coaxially to the axis of the work roll. The bending device used at the same time, however, is designed according to the design of the "bending hood".

Due to the significantly lower weight and the manufacturing technology simpler components of the displacement significantly lower production costs can be achieved. By using the bending device no moments are introduced into the backup roller bearings when moving the work rolls.

Fig. 1

einen Teil einer Walzvorrichtung in perspektivischer Ansicht,

Fig. 2

die Vorderansicht der Walzvorrichtung gemäß Fig. 1 in einem Schnitt A-A gemäß Fig. 3,

Fig. 3

die Draufsicht auf die Walzvorrichtung in einem Schnitt B-B gemäß Fig. 2 und

Fig. 4

die Biegemittel der Walzvorrichtung in einem Schnitt C-C gemäß Fig. 3.

In the drawing, an embodiment of the invention is shown. Show it:

Fig. 1

a part of a rolling device in perspective view,

Fig. 2

the front view of the rolling device according to Fig. 1 in a section AA according to Fig. 3 .

Fig. 3

the top view of the rolling device in a section BB according to Fig. 2 and

Fig. 4

the bending means of the rolling device in a section CC according to Fig. 3 ,

In the figures, a rolling device 1 can be seen, in which two cooperating work rolls 2 and 3, which are respectively mounted in a work roll chock 4 and 5, are arranged in a rolling stand 6. For setting a roll gap 7 between the two work rolls 2 and 3 it is provided that the upper work roll chock 5 is made adjustable in the vertical direction; It can therefore be moved in the vertical direction relative to the rolling stand 6.

The work rolls 2, 3 are supported respectively on support rollers 24 and 25, wherein these are each mounted in a backup roll chock 26 and 27 respectively. The illustrated rolling device 1 thus has a total of four rollers. It should be noted that it may also comprise further rolls, namely intermediate rolls, which are arranged between the work rolls 2, 3 and the support rolls 24, 25.

To initiate a bending moment in the work rolls 2, 3 bending means 11 are provided. As in particular in Fig. 3 can be seen, the bending means 11 are arranged in both axial end portions of the work rolls 2, 3 and, moreover, arranged on both the inlet and the outlet side of the roll stand 6 (see Fig. 2 ). There are a total of four bending means 11 are provided.

The bending means 11 have a block 20 which is fixedly arranged on the roll stand 6, as in particular in Fig. 2 can be seen. The block 20 has cylindrical bores in which pressure force generating elements 14, ie pistons, are arranged, which are acted upon by hydraulic pressure. The pistons 14 have a center axis 18 which extends in the vertical direction.

In Fig. 2 It can further be seen that each work roll chock 4, 5 has cantilevered arms 12 and 13 arranged laterally of the axis 10 of the work roll 2, 3. The cantilevered arms 12, 13 extend laterally outwardly away from the work roll 2, 3 and engage over the pistons 14 and, in particular, their center axis 18.

Between the bending means 11 and in particular the piston 14 and the cantilevered arms 12, 13 of the work roll chocks 4, 5, a pressure transmission element 15 is arranged. This is equipped with two sliding surfaces 19 and 28, which ensure good sliding conditions between piston 14 and pressure transmission element 15 on the one hand and between pressure transmitting element 15 and cantilever arm 12, 13. As can further be seen, the piston 14 and cantilever arm 12, 13 are positioned so that the center axis 18 of the piston 14 intersects the cantilever arm 12, 13. As a result, an optimal power transmission from the bending means 11 to the work roll chock 4, 5 is achieved.

The pressure transmission element 15 is arranged via a vertical guide 29 on the block 20 and can thus move in the vertical direction relative to the block 20 and thus to the rolling stand 6. Similarly, a further vertical guide is provided which guides the pressure transmission element 12 in the upper region on the roll stand 6, namely a crosshead of the pressure transmission element 15th

The pressure transmission element 15 is designed as a "bending hood". This means that it is U-shaped in a horizontal section and at least partially surrounds the block 20 from three sides, as best shown in FIG Fig. 3 you can see. Out Fig. 2 goes out, however, that the pressure transmitting element 15 is formed in a perpendicular to the axis 10 of the work roll 2, 3 vertical section L-shaped and partially surrounds the block 20 on its upper side. With his two thighs (s. Fig. 3 ) is the pressure transmitting member 15 against axial displacement forces vertically slidably arranged but tilt-proof on the sides of the block 20. In addition, it is supported on the working roll 2 facing end face of the block 20 and thus can accommodate large horizontal forces that may be directed in the inlet against and in the outlet with the rolling direction.

As can further be seen, the pressure transmission element 15 is provided in or against the rolling direction with further sliding surfaces which are located on its legs, via which a support on the side facing the work roll 2 faces of the roll stand 6 can take place.

So that the pressure-transmitting element 15 remains in position with the work roll 2, 3 removed and does not fall off the rolling stand 6 or the block 20, holding means 23 are provided (see FIG. Fig. 3 ). The holding means 23 prevent the pressure-transmitting element 15 from being displaceable in the direction of the roll axis 10.

It can also be seen that axial displacement means 8 for axial adjustment of the work roll 2, 3 are present.

In Fig. 4 It can be seen that in addition to the upward pressure force generating elements 14 (piston) of the bending means 11, which act on the upper work roll chock 5, further force-generating elements 30 are provided which generate a downward force and the lower work roll chock 4 with a Apply bending force.

It can thus be said in summary that the work roll displacement devices are hydraulic piston-cylinder units arranged on the service-side work roll chocks. It is the Piston of the piston-cylinder unit connected to 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 support arms and thus also an axial movement of the piston. By pressurizing on the piston side or the rod side of the piston-cylinder unit, an axial displacement of the work rolls mounted in the chocks is realized.

The bending device is characterized by hydraulic blocks with "Biegehauben", which ensures good management of the work roll chocks in the rolling stand even at high roll and at the same time allows shifting of the relevant work roll for targeted change in profile of the rolling gap passing rolling by means of the displacement device. LIST OF REFERENCE NUMBERS 1 rolling device 2 Stripper 3 Stripper 4 Work roll chock 5 Work roll chock 6 rolling mill 7 nip 8th axial displacement 9 actuator 10 Axle of the work roll 11 bending means 12 poor 13 poor 14 Pressure force generating element 15 Pressure transmission element 16 holding arm 17 guide 18 Center axis of the pressure force generating element 19 sliding surface 20 block 21 guide 22 guide 23 holding means 24 supporting roll 25 supporting roll 26 Backup roll chock 27 Backup roll chock 28 sliding surface 29 vertical guide 30 Pressure force generating element

Claims (8)

1. Rolling device (1) comprising
   at least two working rolls (2, 3), which are each mounted by means of at least one working roll chock (4, 5) in a roll stand (6),
   wherein at least one of the working rolls (2, 3) is settable, particularly in vertical direction, in the roll stand (6) for setting a desired rolling gap (7) relative to the other working roll (2, 3),
   wherein at least one working roll (2, 3) is in operative connection with bending means (11), by which this can be loaded with a bending moment,
   wherein the working roll chock (4, 5) has, for accepting the force generated by the bending means (11), arms (12, 13) projecting laterally as seen from the axis (10) of the working roll (2, 3),
   wherein a pressure transmission element (15) displaceable relative to the roll stand (6), particularly in vertical direction, is arranged between an element (14), which generates a pressure force, of the bending means (11), particularly a piston, and the projecting arm (12, 13) of the working roll chock (4, 5) and
   axial displacing means (8) which are constructed as a hydraulic piston-cylinder unit,
   characterised in that
   the axial displacing means (8) with an actuating element (9) in the form of a piston are arranged coaxially with the axis (10) of the working roll (2, 3) to be displaced and
   the actuating element (9) is fastened by one of its axial ends to a mounting arm (16) which is fixed to the roll stand (6) in a guide (17), particularly in a sliding guide, to be translationally displaceable.
2. Rolling device according to claim 1, characterised in that the element (14), which generates pressure force, of the bending means (11) and the projecting arm (12, 13) of the working roll chock (4, 5) are so positioned that the centre axis (18) of the element (14) generating pressure force intersects the projecting arm (12, 13).
3. Rolling device according to one of claims 1 and 2, characterised in that a slide surface (19) is arranged between the element (14), which generates pressure force, of the bending means (11) and the pressure transmission element (15) and/or between the pressure transmission element (15) and the projecting arm (12, 13) of the working roll chock (4, 5).
4. Rolling device according to any one of claims 1 to 3, characterised in that the bending means (11) are arranged in a block (20) fixedly arranged at the roll stand (6) and the pressure transmission element (15) is mounted on the block (20) by means of a guide (21), particularly by means of a vertical guide.
5. Rolling device according to claim 4, characterised in that the pressure transmission element (15) is constructed to be U-shaped in a horizontal section and surrounds the block (20) at least partly from three sides.
6. Rolling device according to claim 4 or 5, characterised in that the pressure transmission element (15) is constructed to be L-shaped in a vertical section perpendicular to the axis (10) of the working roll (2, 3) and at least partly surrounds the block (20) at its upper side.
7. Rolling device according to any one of claims 4 to 6, characterised in that the pressure transmission element (15) is mounted on the roll stand (6) by means of a guide (22), particularly by means of a vertical guide.
8. Rolling device according to any one of claims 4 to 7, characterised in that holding means (23) which hold the pressure transmission element (15) at the block (20) to be immovable relative to the working roll (2, 3) in horizontal direction are arranged between the block (20) and the pressure transmission element (15).

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