EP1212153B1 - Rolling stand - Google Patents

Abstract

The invention relates to a roll stand comprising a pair of work rolls 1, 2 for rolling a metal strip B, comprising back-up rolls 8, 9, 10, 11 which provide lateral support to their respectively allocated work rolls 1, 2 , with support force directed towards the work rolls 1, 2 being able to be applied to said back-up rolls by means of a force generation device, and comprising support rolls or intermediate rolls 3, 4 which are borne by a chock which can be slid into the roll stand W 1 , W 2 in the direction of the longitudinal axis of said chock 7 , and wherein said chock can be withdrawn from said roll stand, with each support roll or intermediate roll supporting an associated work roll 1, 2 in a direction which is essentially perpendicular to the direction of movement of the metal strip B. In such a roll stand, changing of the rolls can be carried out more quickly and easily in that the back-up rolls 8, 9, 10, 11 can be positioned from an idle position in which they are arranged outside the region where the chock 7 of the support roll or intermediate roll 3, 4 moves during slide-in or withdrawal, to an operating position in which they rest against the work roll 1, 2.

Description

The invention relates to a rolling stand with a pair of Work rolls for rolling a metal strip, with Support rollers, of which the respectively assigned to them Work rolls are supported laterally and by means of a force generating device with an in direction the work roll directed support force acted upon are, and with backup or intermediate rolls, by one in the direction of its longitudinal axis in the roll stand slidable and removable from this chock are worn and each one of which you associated work roll in a substantially perpendicular to the direction of movement of the metal strip supports direction.

In a rolling mill known from DE 29 19 105 C2 are the work rolls on each an intermediate roll on each supported by a support roller. At the same time each work roll assigned to two support rollers, the opposite side to the respective Working roll abut. The back-up roll and the Intermediate roll are in the known rolling stand in one Chock stored. At the same time are on the Chock bar-like carrier for the support rollers hinged. Here are the lateral dimensions the carrier so limited that the carrier with the Support rollers not laterally from the chock protrude. In this way, the chock with the backup roll, the intermediate roll and the support rolls and the associated support and bearing elements a Assembly unit, as such, easy for maintenance and repair Repair work pulled out of the scaffolding and then can be pushed in again. The necessary Support forces are in the known device by means of manually adjustable bolts applied, which in each case laterally on the carrier act without being coupled with them.

The advantage of the above-explained known Design of a six-high stand is in the Compactness of the chock and that of him worn parts formed unit. It allows to change this assembly within a short time. However, it turns out in the known rolling mill in practice as difficult, within a short time For example, a backup roll or one of Replace support rollers, as always Installation work carried out to a considerable extent Need to become.

In addition to the above-described prior art from Austrian Patent AT 359 459 Roll stand known in which to support the Work roll three support rollers are provided. The Support rollers themselves are each side by supported by hydrostatic bearings, of which three each in regular distance along the respective work roll are arranged. To apply the required Supporting forces are also hydraulic cylinders intended.

The problem is known from the AT 359 459 Roll stand on the one hand, the disassembly of Support rollers and on the other hand to the respective Load during rolling adapted adjusting the Support forces.

In one known from DE 33 24 562 C2 Further development of the above-explained state In the art, the support rollers are via a carrier hinged to the support and intermediate rollers bearing Chock stored. As in the opening explained However, the prior art is also in this Further development of replacing the individual rollers difficult and time consuming.

In addition to the above-described prior art from EP-A-149 247 a mill stand known in which the Support rollers each supported by a support bar are. With the support beam actuating cylinder are coupled, the respective support beams from a rest position in move the operating position. Once the operating position is reached, the force with which the support rollers be pressed against the work roll during operation, with Help of wedges set by means of a Spindle drive are guided in a housing and to the lateral ends of the respective support beam act.

Finally, from EP-A-0 143 166 a rolling stand of Initially specified type, in which the Support rollers from a rest position in which they are arranged outside the area in which the Chock of the support and intermediate rolls in Pushing in or taking off, in one Operating position are deliverable, in which they at the Work roll abut, with several Force generating devices along the support roller are arranged distributed. To a to the deformation of the Work roll adapted support of the work roll to allow are in the known rolling stand a Variety of trained as hydraulic cylinder units Force generating devices exist that are tight placed close to each other directly on the Back-up roller act. This large number of Force generating devices do not just make the Control of the known rolling mill difficult, but also lead to particularly high production costs. Added to that, despite the many Force generating devices in the known rolling stand the initiation of the deformation and support force in the Support rollers are not jump-free.

Based on the above-mentioned state of Technique was therefore the object of the invention, a to create economically producible rolling stand, at the one hand, the control effort is reduced and on the other hand, an optimal influence on the Work rolls is possible.

This task is accomplished by a rolling mill with the in the Claim 1 specified features solved.

According to the invention, the support rollers from the Range of movement of the support roller and possibly further Rolling chock to be moved out. On this way, the chock with the stored therein Rollers independent of the support rollers from the Roll stand removed, serviced and pushed back in become. It is also possible, the support rollers regardless of the rollers of the chock to wait or to replace.

Another essential advantage of the invention is in that it is no longer necessary, the spatial Arrangement of the rolls carried by the chock the need for articulated storage of Adjust support rollers. The resulting space opens the possibility for the interpretation of the support, Intermediate and work rolls a larger area of Diameter to choose. For example, opposite the prior art larger roll diameter be provided so that a larger Abschliffbereich is available and the respective rollers one have a longer life. In addition, the Intermediate rolls according to the load of them each associated work roll are bent so that the dimensional accuracy of the roll gap is further improved.

As a result, the invention achieved by the always realized in the explained prior art, from The assembly formed by the rollers and the chock has resolved that the individual rolls of a Roll stand according to the invention quickly and easily can be made available, so that their Maintenance or repair in less time and simplified can be performed.

By the force generating device from the support roller the rest moves into the operating position, the takes over Force generating device not only the application of the Supporting force, but also serves as Adjusting device, with which the support rollers on the Delivered to work rolls or driven back from them can be. This supports the most cost-effective production of the invention Rolling stand.

The required support forces can be at low Generate space and energy requirements by the fact that the Force generating device a hydraulic or is pneumatically actuated cylinder. By one each or a plurality of such cylinders on the support rollers act, can be used for supporting the Support roller required forces exactly and with short Dose reaction times. This makes it possible over the Actuation of the support rollers with precisely divided Support forces to the nip between the work rolls influence.

Due to the fact that the respective support roller of a Support beam is worn and that the Force generating device acts on these bars, can the support forces while avoiding Apply stress jumps on the support rollers.

The latter applies in particular when a storage is provided, through which the support roller at least over certain sections of its longitudinal extent on the Support beam is supported. Be punctual on the Supporting rollers acting force generating devices, such as actuating cylinder or similar, about a stamp the supporting force transmitting aggregates is used in the inventive use of a Support beam on the one hand compared to the state of Technology lower number of force generating devices sufficient to make the desired smooth transition from the burden on each institution to reach. On the other hand, the use of the Supporting beam a targeted deflection of the working and / or support roller.

A first possibility of training a storage is that the storage by roller bearings is formed, which at regular intervals along the support roller are arranged. Alternatively, the However, storage by at least one hydrostatic Be formed camp. Regardless of how the storage is formed, it can be in single, along the subdivided segments arranged respective support roller be, then expediently the respective Be assigned to Kraftbeaufschlagungseinrichtungen.

If the support bar in the longitudinal direction of the support roller is divided into two detachably connected parts, wherein the first part carries the support roller and the second is coupled to the force generating device, can be carried by the respective support beam Replace support roller particularly easily and quickly. This especially applies when the first, the support roller carrying part in its longitudinal direction displaceable on the second part of the support beam is held.

Fig. 1

einen Ausschnitt eines Walzgerüstes in einer ersten Betriebsstellung im Schnitt längs zur Förderrichtung des gewalzten Metallbandes;

Fig. 1a

einen Ausschnitt A der Fig. 1 in vergrößerter Ansicht;

Fig. 2

das Walzgerüst gemäß Fig. 1 in einer zweiten Betriebsstellung;

Fig. 3

das Walzgerüst gemäß Fig. 1 in einem Schnitt parallel zur Förderebene des gewalzten Bandes;

Fig. 4

einen Ausschnitt eines zweiten Walzgerüstes in einer ersten Betriebsstellung im Schnitt längs zur Förderrichtung des gewalzten Metallbandes;

Fig. 5

das Walzgerüst gemäß Fig. 4 in einer zweiten Betriebsstellung.

The invention will be explained in more detail with reference to a drawing illustrating an exemplary embodiment. In a schematic representation:

Fig. 1

a section of a rolling mill in a first operating position in section along the conveying direction of the rolled metal strip;

Fig. 1a

a section A of Figure 1 in an enlarged view.

Fig. 2

the rolling stand of Figure 1 in a second operating position.

Fig. 3

the rolling stand of Figure 1 in a section parallel to the conveying plane of the rolled strip.

Fig. 4

a section of a second rolling mill in a first operating position in section along the conveying direction of the rolled metal strip;

Fig. 5

the roll stand of FIG. 4 in a second operating position.

In the figures, functionally identical elements with provided the same reference numerals.

The rolling stands W1, W2 each have two work rolls 1.2 on. The work rolls 1,2 are in vertical Direction in each case via an intermediate roller 3,4 at one Supported roller, not shown, whose Rotary axis in the same plane as the axes of rotation of the Work rolls 1,2 and the intermediate rolls 3,4. The Intermediate rollers 3,4 are in a chock 7 and the Not shown backup rolls in a likewise not stored own chock, while the Work rolls 1,2 loosely held in the rolling stand W1, W2 are. Between the work rolls 1,2 is a roll gap W formed in which a in the conveying direction F rolled metal strip B is cold rolled.

The chock 7 is on a not shown Slidably mounted guideway and can in his Longitudinally parallel to the axes of rotation of the Working, intermediate and support rollers from the respective Rolling stand W1, W2 are pulled.

Each work roll 1, 2 are two support rolls 8, 9, 10, 11 assigned, one of each side of the work roll 1.2 is assigned. The support rollers 8, 9, 10, 11 become each supported by a support bar 12,13,14,15.

The support beams 12,13,14,15 are each in two parts 12a, 12b divided, the division plane vertical is arranged and extends parallel to the plane, in which the axes of rotation of the work rolls 1,2, the Intermediate rollers 3,4 and the support rollers, not shown lie. The second part 12b of the respective support beam 12,13,14,15 carries the this support beam 12,13,14,15 respectively associated support roller 8,9,10 or 11. About one at the respective first part 12a trained guide rail 12c and retaining pin 16 is the respective second part 12b on the first part 12a in FIG slidably held in its longitudinal direction, so that it with the supported by him support roller 8,9,10 and 11, respectively the respective rolling stand W1, W2 can be pulled.

In the embodiment according to FIGS. 1, 2 and 3 for lateral support of the support rollers 8,9,10 or 11 along the support rollers 8,9,10 and 11 in regular intervals hydrostatic bearings 18 arranged. The bearings 18 are at the respective Support beams 12,13,14,15 supported and are about a Supply line 19 in the second part 12b of the respective Support beam 12,13,14,15 supplied with pressurized fluid.

In the embodiment according to the figures 4,5 are for lateral support of the support rollers 8,9,10 and 11th along the support rollers 8,9,10 and 11 in regular Intervals on the support beams 12,13,14,15 roller bearing 118th arranged. The roller bearings 118 are also on the respective support beams 12,13,14,15 supported.

Each support beam 12,13,14,15 are each several in regular intervals along the respective Support beam 12,13,14 and 15 placed hydraulically associated actuating cylinder 20,21,22,23, in the side of the chock 7 arranged columns 24th or 25 of the roll stand W1, W2 are attached. The pistons 20a, 21a, 22a, 23a of the actuating cylinder 20,21,22,23 are with the first part 12a of the respective support beam 12,13,14 or 15 coupled. The movement axis X of the pistons 20a, 21a, 22a, 23a are each in the direction of the nip W inclined arranged.

Between the respective place of attachment of the Stellzylinder 20,21,22,23 and the room in which the Chock 7 when pushing in or pulling out is moved, there is a free space R each. Whose Depth and the travel of the pistons 20a, 21a, 22a, 23a are each dimensioned so that when fully retracted Piston 20 a, 21 a, 22 a, 23 a of them each carried Support beams 12,13,14,15 with the respective stored thereon Support rollers 8,9,10 and 11 in this free space R are located (Fig. 2, Fig. 5). In this position the piston 20a, 21a, 22a, 23a and the support beams connected to them 12,13,14,15 can the chock 7 with in it mounted, not shown here backup rolls and Intermediate rollers 3,4 without the risk of collision with the support rollers 8,9,10,11 from the roll stand W1 and W2 to be pulled.

To replace the support rollers 8,9,10,11 is the respective second part 12b along the guide rail 12c from the respective first, with the respectively assigned Piston 20 a, 21 a, 22 a and 23 a connected part 12 a of Support beams 12,13,14,15 pulled. This can for one thing pulled-out chock 7 done. These are the Support rollers 8,9,10,11 with the support beams 12,13,14,15 in the respective space R drove, so that the Chock 7 unimpeded from the roll stand W1 or W2 can be pulled.

Alternatively, the support rollers 8,9,10,11 also together with the chock 7 from the rolling stand W1 or W2 are drawn. These are the support beams 12,13,14,15 into a position in which their respective guide rail 12c in alignment with each outer edge of the chock 7 are arranged. At the Pulling out the chock 7, the parts 12 a of Support beams 12,13,14,15 and with them the respective Support roller 8,9,10,11 together with the chock 7th pulled out of the rolling stand W1, W2. In this way forms the chock 7 an assembly and disassembly, the it allows on a special auxiliary device of this kind to renounce.

When zuzustred on the work roll 1,2 support rollers 8,9,10,11 is from the actuating cylinders 20,21,22,23 the Supporting force generated by which the support rollers 8,9,10,11 on the hydrostatic bearing 18 and the Roller bearing 118 on their from the respective work roll 1,2 are facing away from each other. The of the individual along the respective support beam 12,13,14,15 arranged actuating cylinder 20,21,22,23 respectively given supporting forces can be adjusted in this way be that a certain geometry of the roll gap W by a corresponding deflection of the respective Support rollers 8,9,10,11 or work roll reaches 1.2 becomes.

LIST OF REFERENCE NUMBERS

W1, W2

rolling mills

1.2

strippers

3.4

intermediate rolls

7

chock

8,9,10,11

up rolls

12,13,14,15

shore

12a, 12b

Parts of the support beams 12,13,14,15

12c

guide rail

16

retaining bolt

18

hydrostatic bearings

19

supply line

20,21,22,23

actuating cylinder

20a, 21a, 22a, 23a

piston

24.25

Pillars of rolling stand W1, W2

118

roller bearing

B

metal band

F

conveying direction

R

free space

W

nip

X

Movement axis of the piston 20a, 21a, 22a, 23a

Claims (8)

1. A roll stand

   with a pair of work rolls (1, 2) for rolling a metal strip (B),

   with back-up rolls (8, 9, 10, 11), which provide lateral support to their respectively allocated work rolls (1, 2),

   with support beams (12, 13, 14, 15), each of which respectively bears one of the back-up rolls (8, 9, 10, 11),

   with several force generation devices (20, 21, 22, 23) arranged distributed along the back-up rolls (8, 9, 10, 11), said force generation devices acting on the support beams (12, 13, 14, 15) and each being individually adjustable in such a way that a certain course of the bow of the back-up rolls (8, 9, 10, 11) and/or of the work rolls (1, 2) is adjusted via the support beams (12, 13, 14, 15), and

   with support or intermediate rolls (3, 4), which are borne by a chock (7) which can be slid into the roll stand (W1, W2) and be withdrawn therefrom in the direction of the longitudinal axis of said chock, and each of which support and intermediate rolls supports the work roll (1, 2) assigned to it in a direction which is essentially perpendicular to the direction of movement of the metal strip (B),

   wherein the back-up rolls (8, 9, 10, 11) can be positioned by means of the force generation devices (20, 21, 22, 23) from an idle position, in which they are arranged outside the region where the chock (7) of the support roll or intermediate roll (3, 4) moves during slide-in or withdrawal, to an operating position in which they rest against the work roll (1, 2).
2. The roll stand according to claim 1, characterised in that the force generation devices are hydraulically or pneumatically operable actuating cylinders (20, 21, 22, 23).
3. The roll stand according to any one of claims 1 or 2, characterised in that the force generation devices are mechanically adjustable spindles.
4. The roll stand according to any one of the preceding claims, characterised in that a bearing arrangement (18) is provided, in which the back-up rolls (8, 9, 10, 11) are supported, at least over certain sections along their longitudinal extension, by the support beam (12, 13, 14, 15).
5. The roll stand according to claim 4, characterised in that the bearing arrangement consists of at least one hydrostatic bearing (18).
6. The roll stand according to claim 4, characterised in that the bearing arrangement consists of roller bearings (118), which are arranged at regular intervals along the back-up rolls (8, 9, 10, 11).
7. The roll stand according to any one of the preceding claims, characterised in that the support beams (12, 13, 14, 15) are divided into two detachably interconnected components (12a, 12b) in the longitudinal direction of the back-up rolls (8, 9, 10, 11) and in that the first component (12a) bears the back-up roll (8, 9, 10, 11) and the second component (12b) is coupled to the force generation device.
8. The roll stand according to claim 7, characterised in that the first component (12a) which bears the back-up roll (8, 9, 10, 11) is held to the second component (12b) of the support beam (12, 13, 14, 15) so as for the first component to be slidable along its longitudinal direction.

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