DE102008035702A1 - rolling device - Google Patents

Abstract

The invention relates to a rolling device with at least two work rolls (2, 3) which are each mounted by means of at least one work roll chock (4, 5) in a rolling stand (6), wherein at least one of the work rolls (2, 3) in the rolling stand (6). for adjusting a desired roll gap (7) relative to the other work roll (2, 3), in particular in the vertical direction, is adjustable, whereby Axialverschiebemittel (8) are present, with which a work roll (2, 3) relative to the roll stand (6) can be moved in its axial direction, wherein the Axialverschiebemittel (8) have an actuating element (9) which is coaxial with the axis (10) of the displaceable work roll (2, 3) is arranged, and wherein at least one work roll (2, 3) Bending means (11) is in operative connection with which it can be acted upon by a bending moment. In order to allow the axial displacement of the work rolls while at the same time allowing them to be subjected to a bending moment in a cost effective manner, the invention provides that the work roll chock (4, 5) for receiving the force generated by the bending means (11) from the axis (10) of the Work roll (2, 3) seen from laterally projecting arms (12, 13), wherein between a pressure force generating element (14) of the bending means (11), in particular a piston, and the cantilever arm (12, 13) of the work roll chock (4 , 5) a relative to the rolling stand (6), in particular in vertical ...

Description

The Invention relates to a rolling device with at least two work rolls, each by means of at least one work roll chock are stored in a rolling stand, wherein at least one the work rolls in the rolling stand for setting a desired Rolling gap relative to the other work roll, in particular in vertical direction, adjustable, being Axialverschiebemittel are present, with which a work roll relative to the roll stand can be moved in its axial direction, wherein the Axialverschiebmittel having an actuator coaxial with the axis is arranged to be shifted work roll, and wherein at least a work roll is in operative connection with bending means, with which can be acted upon by a bending moment.

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.

Further The previously known rolling device comprises bending means with which the Work roll can be acted upon with a bending moment. The bending means are supported between the chock of the stripper and the chock of the adjacent backup rolls from. For low movements of the lower work roll in vertical Direction the bending means are supported between the chocks the lower work roll and thickening of bars of the rolling stand from.

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 that 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.

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

Because of the coaxial arrangement of the sets of rollers must the axial displacement devices do not absorb tilting moments, which are otherwise to be considered in displacement systems, which are arranged stationary on the rolling stand.

This has a positive effect on the dimensioning of the displacement devices because a lower displacement force is needed.

adversely is in this design, however, that during the work roll axial displacement the upper work roll set over the applied with Balancierdruck Bending cylinder of the upper backup roll chocks is pushed. The resulting friction forces generate Tipping moments, which is a misalignment of the backup roll chocks can effect. In a sudden admission of the Scaffolding with the rolling force ("puncture") following the work roll displacement can not therefore be ruled out that it at the support roller bearing - in oil floods - too a local contact of bearing bush and pin bush comes what cause bearing damage due to edge pressure can or that in the case of rolling bearings individual rows of bearings to experience excessive stress.

Known Bending devices which are constructed in the manner of a "bending hood" have also become. This is a work roll bending system in which Hydraulic blocks with so-called. "Biegehauben" provided that are a good guide of the work roll chocks in the roll stand even at high roll emergence and at the same time allows a displacement of the relevant work roll.

The Device for axial displacement of the work rolls is at one attached to the two rolling stand. there is each lateral support part ("displacement ear") the relevant work roll chocks a displacement cylinder unit assigned. In these sliding cylinder units are the work roll chocks slidably arranged in vertical direction.

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

adversely is with this concept, however, that because of the arrangement of the Displacement device on the outside of the post and the requirement that the forces occurring in the rolling process also taken at high roll from the shifter must be a sweeping and therefore serious and expensive version of the displacement device results.

Of the The invention is therefore based on the object, a rolling device to create the type mentioned, the disadvantage of the first explained type avoids and the advantages of the following makes the discussed solution usable. So it should be the high Weight of the last discussed solution avoided and one less expensive construction can be achieved. It should while a high roll rise can be realized.

These The object is achieved according to the invention that the work roll chock for receiving the of The force generated by the bending means from the axis of the work roll seen from laterally projecting arms, wherein between a compressive force generating element of the bending means, in particular a piston, and the cantilever arm of the work roll chock a relative to the roll stand, in particular in the vertical direction, slidable pressure transmission element is arranged.

The Axialverschiebemittel are preferred as a hydraulic piston-cylinder unit educated. The actuator of the Axialverschiebemittel is preferably formed in the form of a piston, wherein the piston with one of its axial ends attached to a support arm, on the rolling stand in a guide, in particular in a sliding guide, set translationally displaceable is.

The Compressive force generating element of the bending means and the cantilever Arm of the work roll chock are preferred positioned so that the center axis of the pressure force generating element cuts the cantilevered arm.

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

The Bending means are advantageous in a fixed to the rolling stand arranged block arranged and the pressure transmission element is by means of a guide, in particular by means of a Vertical guide, stored at the block. The pressure transmission element is preferably formed in a horizontal section U-shaped and at least partially surrounds the block from three sides. The pressure transmission element is in a perpendicular to the axis of the work roll Vertical section preferably L-shaped and surrounds the block at its top at least partially.

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

Between Block and pressure transmission element can holding means be arranged, which the pressure transmitting element in the horizontal direction immobile to the work roll at the block hold.

According to the Invention results in that an axial displacement device for Insert comes arranged coaxially to the axis of the work roll is. The simultane- ously used for use bending device is However, according to the design of the "Biegehaube" trained.

By the significantly lower weight as well as the simpler manufacturing technology Components of the displacement device are significantly lower production costs reachable. By the use of the bending device are in Moving the work rolls no moments in the backup roller bearings initiated.

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

1 a part of a rolling device in perspective view,

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

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

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

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

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

To initiate a bending moment in the work rolls 2 . 3 are bending agents 11 intended. As in particular in 3 can be seen are the bending means 11 in both axial end regions of the work rolls 2 . 3 arranged and incidentally both inlet and outlet sides of the roll stand 6 arranged (see this 2 ). There are a total of four bending means 11 intended.

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

In 2 can be further seen that each work roll chock 4 . 5 cantilevered arms 12 and 13 which is laterally of the axis 10 the stripper 2 . 3 are arranged. The cantilevered arms 12 . 13 extend - from the stripper 2 . 3 away - laterally outward and overlap the pistons 14 and especially its center axis 18 ,

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

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

The pressure transmission element 15 is designed as a "bending hood". This means that it is U-shaped in a horizontal section and the block 20 from three sides at least partially surrounds, as it is best in 3 you can see. Out 2 goes out, however, that the pressure transmitting element 15 in a direction perpendicular to the axis 10 the stripper 2 . 3 standing vertical section is L-shaped and the block 20 partially surrounds at its top. With his two thighs (s. 3 ) is the pressure transmitting element 15 slidably against axial displacement forces but tilt-proof on the sides of the block 20 arranged. In addition, it is at the to the stripper 2 facing end face of the block 20 supported and can thus 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 transmitting element 15 in or against the rolling direction with further sliding surfaces, which are located on his legs, provided on the support to the working roll 2 side facing side surfaces of the rolling stand 6 can be done.

So that the pressure transmission element 15 with dismantled work roll 2 . 3 stays in position and not from the rolling stand 6 or from the block 20 falls, are holding means 23 provided (s. 3 ). The holding means 23 prevent the pressure transmitting element 15 in the direction of the roll axis 10 is displaceable.

It can also be seen that Axialverschiebemittel 8th for axial adjustment of the work roll 2 . 3 available.

In 4 It can be seen that in addition to the upward pressure element generating elements 14 (Piston) of the bending agent 11 pointing at the upper work roll chock 5 act, further force-generating elements 30 are provided, which generate a downward force and the lower work roll chock 4 apply a 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. In this case, the piston of the piston-cylinder unit is 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 holding arms and thus also an axial movements 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 "bending hoods", the a good guide of the work roll chocks in the rolling mill even at high roll emergence ensures and at the same time a shifting of the relevant work roll to targeted profile change of the rolling gap passing Rolled material by means of the displacement device allows.

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

axis the stripper

11

bending means

12

poor

13

poor

14

thrust generating element

15

Pressure transmission element

16

holding arm

17

guide

18

mid-axis 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

thrust generating element

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1436104 B1 [0002, 0004]

Claims (10)

Rolling device ( 1 ) with at least two work rolls ( 2 . 3 ), each by means of at least one work roll chock ( 4 . 5 ) in a rolling stand ( 6 ), wherein at least one of the work rolls ( 2 . 3 ) in the rolling stand ( 6 ) for setting a desired roll gap ( 7 ) relative to the other work roll ( 2 . 3 ), in particular in the vertical direction, is adjustable, whereby Axialverschiebemittel ( 8th ) are present, with which a work roll ( 2 . 3 ) relative to the roll stand ( 6 ) can be moved in its axial direction, wherein the Axialverschiebmittel ( 8th ) an actuating element ( 9 ) coaxial with the axis ( 10 ) of the work roll to be moved ( 2 . 3 ) and at least one work roll ( 2 . 3 ) with bending agents ( 11 ) is in operative connection with which it can be subjected to a bending moment, characterized in that the work roll chock ( 4 . 5 ) for receiving the bending agents ( 11 ) generated force from the axis ( 10 ) of the work roll ( 2 . 3 ) seen from laterally cantilevered arms ( 12 . 13 ), wherein between a pressure force generating element ( 14 ) of the bending means ( 11 ), in particular a piston, and the projecting arm ( 12 . 13 ) of the work roll chock ( 4 . 5 ) relative to the rolling stand ( 6 ), in particular in the vertical direction, displaceable pressure transmission element ( 15 ) is arranged. Rolling device according to claim 1, characterized in that the axial displacement means ( 8th ) are designed as a hydraulic piston-cylinder unit. Rolling device according to claim 2, characterized in that the actuating element ( 9 ) of the axial displacement means ( 8th ) is in the form of a piston, wherein the piston ( 9 ) with one of its axial ends on a holding arm ( 16 ) mounted on the rolling stand ( 6 ) in a guided tour ( 17 ), in particular in a sliding guide, is set translationally displaceable. Rolling device according to one of claims 1 to 3, characterized in that the pressure force generating element ( 14 ) of the bending means ( 11 ) and the cantilever arm ( 12 . 13 ) of the work roll chock ( 4 . 5 ) are positioned so that the center axis ( 18 ) of the pressure force generating element ( 14 ) the projecting arm ( 12 . 13 ) cuts. Rolling device according to one of claims 1 to 4, characterized in that between the pressure force generating element ( 14 ) 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 work roll chock ( 4 . 5 ) a sliding surface ( 19 ) is arranged. Rolling device according to one of claims 1 to 5, characterized in that the bending means ( 11 ) in a fixed to the rolling stand ( 6 ) arranged block ( 20 ) are arranged and the pressure transmitting element ( 15 ) by means of a guide ( 21 ), in particular by means of a vertical guide, on the block ( 20 ) is stored. Rolling device according to claim 6, characterized in that the pressure transmission element ( 15 ) is U-shaped in a horizontal section and the block ( 20 ) at least partially surrounds from three sides. Rolling device according to claim 6 or 7, characterized in that the pressure-transmitting element ( 15 ) in a direction perpendicular to the axis ( 10 ) of the work roll ( 2 . 3 ) vertical section is L-shaped and the block ( 20 ) at least partially surrounds on its upper side. Rolling device according to one of claims 6 to 8, characterized in that the pressure-transmitting element ( 15 ) by means of a guide ( 22 ), in particular by means of a vertical guide on the roll stand ( 6 ) is stored. Rolling device according to one of claims 6 to 9, characterized in that between block ( 20 ) and pressure transmitting element ( 15 ) Holding means ( 23 ) are arranged, which the pressure transmitting element ( 15 ) in the horizontal direction immovable to the work roll ( 2 . 3 ) at the block ( 20 ) hold.