EP3784424A1

EP3784424A1 - Roll stand

Info

Publication number: EP3784424A1
Application number: EP19718756.0A
Authority: EP
Inventors: Ansgar Radek; Bernhard Schinagl
Original assignee: Primetals Technologies Austria GmbH
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2018-04-27
Filing date: 2019-04-25
Publication date: 2021-03-03
Anticipated expiration: 2039-04-25
Also published as: EP3560615A1; EP3784424C0; US20210146413A1; WO2019207050A1; EP3784424B1; JP7204777B2; JP2021518814A; CN111989171B; CN111989171A

Abstract

The invention relates to a roll stand (1), comprising: - a working roll (2), which is mounted in the roll stand (1) floatingly and for rotation about an axis of rotation (9) extending axially and which has two axially opposite end faces (3, 4); and - at least one bearing assembly (6), which is arranged on one of the two end faces (3, 4) of the working roll (2) and by means of which the working roll (2) is floatingly supported in the roll stand (1) and which has a housing (7), in which the working roll (2) is mounted using a fixed bearing (8). According to the invention, the bearing assembly (6) has a supporting device (17), by means of which the bearing assembly (6) can be axially supported in the roll stand (1).

Description

description

rolling mill

The invention relates to a rolling stand according to the preamble of claim 1.

In rolling mills, the shaping of a rolling stock, for example of steel, takes place on a roll stand. This shape is called rolling.

The rolling of the rolling stock is carried out between at least two work rolls (briefly below usually only rolls), which are in the roll stand - rotatable about their respective axially extending axis of rotation - are stored.

The structure of the rolling stand depends on the number of rollers, the position of the rollers, the shape of the rollers, the forces acting during rolling and the accuracy requirements of the rolling stock. There are both rolling mills with only one as well as those with several nach- or side by side arranged roll stand (s).

In particular for the rolling of higher and high strength steels, such as steels with strengths above 500 N / mm ² , in particular above 1000 N / mm ² , in such rolling stands in diameter small rolls, for example those with diameters in the range of 150 mm to 180 mm, which are stored floating in the rolling stands.

A "floating" bearing (also often referred to as a "flying" bearing) is understood to mean a bearing of an element extending around an axially extending axis of rotation, such as the roller, which bearing (with respect to the axially extending rotational axis of the rotating element) in the axial direction has a game / allows. That is, the (floating) element is in the axial direction not clearly fixed. As a result, mechanical or thermal changes in length, in particular of the elements to be stored, can be accommodated without the bearings becoming distorted.

Since, in such small diameter rollers, the (drive) torque - due to mechanical reasons - can no longer be directly transmitted via a drive pin arranged on the (end face) of the roller, such rollers are exclusively supported by - parallel (with respect to their respective axes of rotation) Rolls arranged and surfaces on their respective jacket / surfaces in the frictional or frictional contact with the (driven) rollers standing - (rotatably mounted about their own respective rotation axes) intermediate rollers driven.

In general, these rollers are also - based on the tape direction of travel - laterally, d. H. at their (two) axial end faces, by further (also about their own Rotati onsachsen rotatably mounted) support rollers or support rollers - by adhesion or frictional engagement (roller and support roller / - role or the lateral surfaces / surfaces roll off) - supported.

D. h., In the axial direction of the rollers results in their - the lateral support (at the axial end faces of the whale zen) effecting - form-frictional engagement by (both sides) since Lich thereof mounted and oriented in the vertical direction rollers in the form of support rollers or support rollers. D. h., The axes of rotation of these support rollers are normal to the Rotati onsachsen aligned by them to be supported rollers or vertically (with horizontally oriented rollers).

Such - the roller axially supporting - support roller provides a - (also) in (relative to its axis of rotation) axial direction - curved tread / lateral surface / surface ("barrel shape"), whose diameter largest circumferential circle (Circumferential circles or circumferential circle surfaces result from cuts through the support roller normal to its axis of rotation) is radially offset with respect to the axis of rotation of the roller.

As a result, these (mutual) side or axially arranged on the end faces of the rollers support rollers depending Weil along a line on its surface (ie the linear force or frictional contact with / on the front side of the roller forming peripheral circle) on each respective axial End faces of the roller off - and thus limit their movement in the axial direction.

Optionally, the roller has a mechanical play in the axial direction, so that not necessarily always both mutual support rollers are touched at the same time son sonn the roller in between "free floating".

Thus, such "free-floating" rollers of the inter mediate rollers, the backup rollers / rollers and the rolling stock - non-positively on the respective contact - held .. When replacing the rollers, the rolling stand is opened and the rollers are supported by so-called "balancing arms" ,

In practice, it has been found that it is precisely this type of lateral or axial support of the roller caused by the support rollers can cause great problems.

Due to high rolling (-rotations-) speeds (due to the small diameter of the rollers), large applied rolling forces (because of rolling higher or high strength rolling stock) as well as due to wear (at the frictional / frictional contact) Oberflä involved surface / lateral surfaces ( the contacting / contacting surfaces / lateral surfaces wear away mechanically) because there always - instead of a clean rolling movement along a contact line ("line contact", circumference circle) - always again to friction between these lateral support roll and the end face of the roller.

Naturally, these friction processes also produce high heat of friction - and, in the worst case, lead to ignition and burning off of the roll stand (rolling oil, which is flammable at very high temperatures), is located in the entire inner area of the roll stand.

An object of the invention is to provide a rolling stand with at least one work roll mounted therein, which has an improved friction and wear behavior and is structurally simple.

This object is achieved by a Walzge scaffolding with the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims and the following description.

The rolling mill according to the invention, which in the Walzge scaffolding floating and on an axially extending Rotati onsachse rotatably mounted work roll (briefly below only roller) with two axially opposite end faces has, provides at least one bearing assembly, which at one of the two end faces of Work roller is arranged and which has a housing in which the work roll is mounted using a fixed bearing.

Using the bearing assembly, the roller is then floatingly supported in the rolling stand. D. h., Simplified and in short, the bearing assembly, which supports the roller with means of the fixed bearing is "floating" in the rolling set taken.

"Axial" or "axial direction" may - in relation to the rotational axis of the roller - as its "longitudinal extent" or "Radial" or "radial direction" thus results as normal to "axial" or to the "axial direction" directed extension.

In particular, such a bearing assembly, in whose hous se the roller is accommodated by means of the fixed bearing, also be arranged on each of the two end faces of the roller.

In this case, under a fixed bearing a bearing concept or ei ne storage / bearing assembly (for supporting a rotatably about an axially ersteckende rotational axis component, such as the roller) are understood, which or which la to-like component or the roller in the axial direction (relative to the axis of rotation) clearly positioned.

Such a fixed bearing will take both radial forces and axial forces (axial forces in both axial directions) and these in a component to be stored or the roller "surrounding" construction, such as a housing or the Ge housing of the bearing assembly, direct.

This fixed bearing can in principle by a single La ger, such as a rolling bearing (or possibly also a plain bearing), (here are absorbed by this one camp as well as the axial forces and radial forces, such as a deep groove ball bearing or a four-point storage with each not displaceable arranged Au ßen- or inner rings) are met.

In the case of very high axial or radial loads, two bearings, for example two roller bearings (or, if appropriate, two plain bearings), are often used to fulfill the fixed bearing function, for example an employed (roller) bearing (here two fixed bearings are braced against one another , for example, two arranged in mirror image Angular contact ball bearings or tapered roller bearings) or a fixed-lot storage (here the axial and radial forces are divided separately into two bearings, ie a Axiallager exclusively receiving the Axi alkräfte and exclusively radial forces receiving radial bearing, such as a cylindrical roller bearing (for the radial forces ) with an axial roller bearing (for the axial forces)).

If the fixed bearing by means of rolling bearings, they may, in order to reduce friction and wear, grease lubricated or oil lubricated, in particular grease lubricated be.

"Floating supported" means in particular that the supported component, here the roller (in the roll stand), in its position is not fixed or fixed (in the rolling mill) is fixed (ie "floating" (or translationally displaceable ver) and on the bearing assembly "only" is supported, whereby so then the roller or assembly of roller and bearing assembly is included in the rolling stand), son NEN (translational) degrees of freedom (for the roller) are possible, which is a (translational) position change allow the roller in the rolling mill, for example, an axial and / or horizontal displaceability of the roller.

As a result, mechanical or thermal length changes, in particular in the case of the roller and / or the bearing assembly, can be accommodated without the bearing or the roller being braced.

If, for example, a vertical support of the La gerbaueinheit in the mill, so it can be guaranteed guaranteed hori zontal displaceability of the roll in the rolling stand. About a - in the axial direction - telescopic displaceability of two components relative to each other ei ne axial displaceability of the roller can be realized are namely the components - in the axial direction - between the bearing assembly and roll stand or a local roll stand arranged.

The invention is based on the consideration and knowledge that in the storage of the roller with the previous roll on the ro rotating roller roll - due to rolling on the rotating roller roller - in a component, d. H. / namely the support roller, both a "(static) support function" (here the roller is axially supported) and at the same time a "freedom of movement function" (here the rotational movement or the rotational degree of freedom of the roller by a dynamic rolling movement between the roller and the Support roller allows) is combined.

Combines a (single) component, i. H. here the supporting role, these two - in themselves different - functions, d. H. the "static support function" and the "freedom of movement function", this (single) component is loaded to the highest degree differently, it must satisfy both functions. However, this high load is the cause of Verschleißproblema technology (and then downstream, the following problems) in the support role.

Implementing this consideration, the invention provides for a "structural and functional" separation or separation of these two functions, ie the "static support function" and "freedom of movement function".

Thus, the realization of the "freedom of movement function" is characterized in that the work roll - by means of one or the - "classic" - fixed storage - stored / recorded in the bearing assembly or its housing. The rotatory degree of freedom is - exclusively - made possible by the fixed bearing, - whereby - with "fixed" (ie not ro- tierendem) housing or the bearing assembly - the roller rela tive to the "stationary" housing or the bearing assembly ro benefits.

If the roller is received in the bearing assembly or its housing by the fixed bearing, then the "static support function" (for the roller) can then be realized that the housing or the bearing assembly in the rolling stand, for example in a local rolling stand , "Floating supported" or is taken up. Between such a "fixed" roll stand and the "stationary" housing or bearing assembly occurs so no rotational relative movement (more) (, whereas translational Ver shifts (because "floating") are possible.

Stated simply, "static support" occurs between the bearing assembly / housing and the mill stand, and "rotational / rotational degree of freedom" occurs by means of the fixed bearing between the roller and the housing / mounting unit. In short, "support" and "rotation / the rotatory degree of freedom" are decoupled.

A rolling stand in which the work roll is supported floating on one side by means of a bearing assembly of the type described above is disclosed, for example, in WO 2005/011885 A1 as well as in JP H10 80708 A.

In the invention it is also provided that the bearing unit has a supporting device by means of which the bearing assembly is axially supportable in the rolling mill.

The supporting device of the bearing assembly makes it possible, axial forces acting roller during operation of the rolling stand on the working, to the rolling mill, in particular to a whale zenständer of the rolling mill, derive. This allows a secure and stable operation of the rolling stand.

In other words, in the present invention, by means of the La gerbaueinheit not only the "floating" storage / support of the roller, but also a derivation of axial forces to the rolling stand, in particular to a roll stand of Walzge setup, be realized.

Unlike the rolling stand from WO 2005/011885 Al or JP H10 80708 A, in which the bearing assembly unit no support device for the axial support of Lagerbauein unit (and so the roller), in the invention, no separate assembly ( in addition to the bearing assembly), which axial forces can be transmitted to the mill stand, in particular at its roll stand. As a result, a structurally simple design of the roll stand is made possible.

In the rolling stand of WO 2005/011885 A1 or JP H10 80708 A, axial forces are transmitted to the rolling stand or the roll stand via an axial displacement means arranged on the opposite side of the bearing assembly. In the invention, it can be dispensed with in principle Lich on such Axialverstellmittel.

According to a preferred embodiment, it is provided that the fixed bearing using a rolling bearing assembly, in particular a salaried rolling bearing assembly is realized.

The solid bearing forming the rolling bearing assembly can be realized by means of a single (rolling) bearing, but especially - just necessarily in the case of an employee (Wälz-) storage - by means of two (or possibly even more) (Wälz-) camps. Is in a development an employee Wälzlageranord tion provided, the employment of Wälzlageranord voltage in the form of an X-arrangement or an O-arrangement can be reali Siert. Conveniently, to increase a Abstützbreite, the employment may be an O-arrangement.

Furthermore, it can also be provided that the rolling bearing assembly, in particular the employees Wälzlageran order, using at least a first and mindes least a second against each other employed Kegelrollenla gers or spherical roller bearing or angular contact ball bearing reali Siert.

Particularly preferably, such a first and a second ge against each other employed in O arrangement tapered roller bearing can be used ver.

In order to reduce the load on a single, in particular a single nen of each other employed (rolling) bearing, it may be provided to use several of the first and / or second (rolling) bearings, in particular tapered roller bearings.

According to a further development, it is provided that the bearing assembly, in particular the housing, against an environment environment, in particular using one or more seals, in particular a Simmerringdichtung and / or a V-ring seal and / or an O-ring seal and / or a Labyrinth seal, sealed and / or encapsulated. Thus, the fixed bearing or the housing interior of ambient pollution loads, such as pollution, dust, u. Ä., Protected and thus their life extended.

According to a preferred embodiment, it is provided that the supporting device is arranged on the housing of the bearing assembly is. By means of the support device, the housing, - and so the roller - in the roll stand, for example on a roll stand, be axially supportable.

In order to realize as defined axial support of the bearing unit (and so the roller), it is advantageous if the support device has a cambered end face for axial support, for example against a flat plate in the rolling mill ("housing stopper") Bom bierung on the end face of the support device, the support contact - ideally - be redu ed on a point contact, which free of radial obstacle

sen / restrictions.

Preferably, the bearing assembly comprises a spring element, in particular a coil spring. Moreover, it is advantageous if the supporting device has a first and a second component. Furthermore, it can be provided further education that the two components of the support device in the axial direction against each other are displaceable (similar to a telescope) (and so the (axially) floating bearing of the roller is rea lisiert). This makes it possible to absorb mechanical or thermal cal length changes, in particular the roller, without it to jamming u. Ä. comes. Advantageously, the two components of the support device in Axialrich direction using the spring element can be clamped.

The first component may for example be integrally formed with a part of the housing, in particular a housing cover, the La gerbaueinheit. Preferably, the first component is designed as a hollow cylinder open on one side. This advantageously has a radially protruding edge at its open end. Furthermore, it is preferred if the second component is designed as a hollow cylinder open on one side. is forming. This encompasses with its inner extent advantageously the edge of the first component.

Furthermore, it can be provided that at a radially au ßenliegenden, the work roll facing end face of the second component, an annular disc is fixed, the inner diameter is smaller than the diameter of the edge of the first component.

Said spring element is advantageously arranged in a cavity of the first component. With its first end, the spring element is preferably supported against the Ge housing of the bearing assembly. With its second end, the spring element is preferably supported against a radially inner, the work roll facing end face of the second component.

According to a further development, it is provided that the fixed position has a tion on one of the two end faces of the roller to parent, substantially axially extending rollers on which the fixed bearing "sits", ie, on which camp of the fixed storage, for example, the ( Employed) tapered roller bearings, in particular in Ausgestal device with a plurality of first and / or second roller or cone roller bearings are arranged.

Further education may preferably also be provided that in nenringe of - the fixed bearing training - Wälzla like, especially from the tapered roller bearings, especially in the case of several first and / or second roller or cone roller bearings, on the roll extension, especially under Ver use of arranged between the inner rings on the roll extension spacers and / or a shaft nut, ver are clamped. Also in the outer rings, ie between the outer rings of the - the fixed bearing training - rolling bearings, insbesonde re tapered roller bearings, especially in the case of several ren first and / or second rolling or tapered roller bearings, Kings such spacers may be provided.

By means of such - in particular precision manufactured - Dis dance rings, especially in the case of a plurality of first and second roller or tapered roller bearings, a force distribution can be optimized for the rolling bearings and tapered roller bearings.

In particular, by a vote of the "inner" and "äuße ren" spacer rings supporting forces - evenly distributed on the outer rings of the rolling bearing, in particular the tapered roller bearings,

- be discharged into the housing.

The tension can be preferably by heels, shoulder u. Ä. realize the roll extension, against which the inner rings of the - the fixed bearing training - rolling bearings, in particular of the tapered roller bearings, are braced. Since the shaft nut can be screwed on the "free end" of Walzenfortsat zes.

Conveniently, the roller extension (at its opposite end opposite the free end) screwed to the roller, in particular screwed centered, or integrally formed with the roller. Especially in a roll with the Wal screwed roller extension is a lighter (flexible and faster (thus cost and time-saving) replacement of a roller, such as wear of the roller or a changed roll gap, possible without ei ne further disassembly, especially the bearing assembly necessary is. If the roller is preferably through-hardened, it can be provided that the roller extension is not hardened.

According to a further preferred embodiment, it is provided that the bearing assembly, in particular the housing, at least one holding element ("Ohrwaschl") with a support surface for a movable support ("floating support") on a supporting element, in particular a bending cylinder, has. Preferably, two such retaining elements may be provided on the housing Ge.

Is so - in a roll change - the roller over the or the holding elements - after a lateral opening of the Walzge setup - of / on the or the support element / - / B / B - / worn - and the roller so then to closing From a corresponding device (carriage o. Ä.) Are removed from the rolling mill, can be dispensed with the any known "balancing arms".

Conveniently, to facilitate assembly / disassembly operation on the rolling stand, the housing may be multi-part, in particular two covers ("inner / outer cover") and a recorded between the two covers adapter ("chock").

At this intermediate piece is / are then preferably the Halteele element / the holding elements arranged, for example screwed and formed integrally with the intermediate piece.

According to a further development it is provided that the roller has a diameter in the range of about 150 mm to about

200 mm, in particular in the range of about 150 mm to about

180 mm, in particular about 180 mm. Furthermore, it may also be preferred that the rolling stand has two of the bearing assemblies. Advantageously, one of the two bearing assemblies is arranged on one of the two end faces of the work roll and the other of the two bearing assemblies is arranged on the other of the two end faces of the work roll, whereby the roll can be stored on both sides in the rolling stand (floating).

The description given so far of advantageous Ausgestaltun conditions of the invention contains numerous features that are summarized in the individual subclaims in part to several zusammenge summarized. However, these features may conveniently be considered individually and combined into meaningful further combinations. In particular, these features are each individually and in any suitable combination with the mill according to the invention combinable bar.

Although some terms are used in the specification or in the claims in each case in the singular or in conjunction with a number word, the scope of inven tion for these terms should not be limited to the singular or the respective number word. Furthermore, the words "a" and "an" are not to be understood as number words, but as indefinite articles.

The above-described characteristics, features, and advantages of the invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiment (s) of the invention taken in conjunction with FIG the drawings are explained in more detail. The embodiment (s) serve to illustrate the invention and do not limit the invention to combinations of features set forth therein, including functional ones Characteristics. In addition, suitable features of each embodiment can also explicitly considered isolated, removed from one embodiment, introduced into another Ausfüh tion example to supplement it and combined with any of the claims.

Show it:

1 shows schematically a structure of a roll stand with there stored two work rolls;

2 shows a part of a work roll with a Lagerbauein unit (sectional view);

3 shows a part of a work roll with a Lagerbauein unit (in perspective).

Roll stand with work roll

FIG 1 shows schematically a structure of a rolling stand 1 with - there - two - about its respective axially extending axis of rotation 9 rotatably - (floating) mounted working rollers 2 for shaping, d. H. for rolling, a rolling stock, here of high-strength steel.

The two work rolls 2, each having a diameter of about 180 mm, are - in front of or adjustable barem distance - (with respect to their axes of rotation) parallel to each other in the rolling stand 1 (substantially vertically überei nander), which is between the two working rolls 2 forms a nip through which the rolling passes and thereby deformed, d. H. rolled, will.

Since in such small diameter rollers, the (driving torque is no longer transmitted directly to the (axial end faces of) rollers arranged drive pin can, the two work rolls 2, as shown in FIG 1, with parallel arranged (with respect to their respective axes of rotation 9) to the work rolls 2 and via their respective lateral surfaces / surfaces in the force or frictional con tact with the (to be driven) work rolls. 2 standing Zwi rule rollers 34 driven.

Both work rolls 2 (hereinafter only briefly rolls 2) are essentially identical in construction and, as shown in FIG. 1, only show minor differences with regard to their installation environment in relation to their arrangement as "upper" and "lower" rolls 2. The functional structural elements in both rolls 2 are basically the same.

2 and 3 each show a part of the roller 2 - with which at the (axial) end face 3 (or 4) of the roller 2 to parent bearing assembly 6, using which the roller 2 in the rolling stand 1 (floating) stored or is included.

A second (symmetrical-identical) bearing assembly 6 is at the other (not visible) (axial) end face 4 (resp.

3) of the roller 2 - corresponding to the first bearing assembly 6 - arranged (not shown).

The bearing assembly 6 provides, as shown in FIG 2 and FIG 3 show a - sealed or encapsulated - (multi-part and screwed / -tes) / housing 7, in which the roller 2 with means of a there fixed bearing 8 in the axial direction 5 and in Radial direction 39 accurately positioned - rotatable - recorded / stored.

The housing 7 (and so the roller 2) in turn is axially beyond its end facing away from the roller 2 35 by means of a locally arranged support device 17 ("housing stopper") in the roll stand 1 or on a roll stand (not illustrated sets) supported. To reduce the support contact (between the support device 17 and the roll stand) - ideally - to a point contact, the support device 17, as shown in FIG 2 and FIG 3 illustrate an axial, cambered end face 18 for axial support 10 of the roller 2 / Bearing assembly 6 and the housing 7 on the roll stand before.

As shown in FIG 2, the support device 17 or the "housing stopper" two in the axial direction 5 against each other ver slidable components 19, 20 (and realized so / by an axial displaceable or axially floating position tion / support 10 of the roller 2 in the rolling stand 1), which are in the axial direction 5 by means of a spring element 21, here a coil spring 21, clamped in the components 19, 20 (, whereby the roller 2 in the roll stand 1 is axially locked or clamped.) Thus, it is possible mechanical or thermal length changes, in particular of the roll 2, without causing jamming and the like, as well as displacements - due to the interaction of the roll 2 with the intermediate rolls 34 and the rolling stock which occurs during rolling itself - can thus be absorbed become.

As FIG 3 shows, the support device 17, a first, flange-like, axially extending member 19, which in one piece with / on one - axially outwardly (ie, facing away from the roller 2 in the axial direction 5, "inside" and "outside" in Axial direction 5 with respect to the roller 2) - housing cover 31 of the housing 7 is formed.

This first component 19 of the support device 17 is similar to ei NEM one-sided open hollow cylinder, which at its axially open (axially outer) end a radially projecting edge 36 (similar to a flange) has. The second component 20 of the support device 17, which is also substantially cylindrical in shape and whose axially outer end face 18, the cambered surface 18 of the support device 17 (for axial support in the roll stand 1 or against the roll stand) provides or forms, surrounds, as FIG 2 illustrates, at or with its inner Erstre ckung 37 - by means of a (screw-on) washer 38 - the edge 36 of the first member 19 from the outside.

Within the clasping, the second component 20, as shown in FIG. 2, provides an axial displacement path 40 on which the first component 19 or its radial edge 36 is axially displaceable ("axially floating") relative to the second component 20.

Is the axial thickness 41 of the radial edge 36 of the first member 19 with about 7 mm at a proposed Ver sliding path 40 of about 12 mm, the result is a free axial mobility of the first member 19 relative to the two th component 20 of approximately 5 mm.

To clamp the first component 19 of the support device 17 against the second component 20 of the support device 17 and at the same time compensate for changes in length, as shown in FIG 2, the coil spring 21 is provided, which is arranged within the hollow cylindrical part of the first member 19 open on one side is and whose first (axially in nenliegendes) end 42 is supported against the axially outer end face 43 of the outer housing cover 31 and the second (axially outboard) end 44 against the (axially inner) end face 45 of the second component 20 is supported.

As further shown in FIG 2 and FIG 3, the housing 7 has three housing parts 31, 32, 33, namely the aforementioned axially outer housing cover 31, an axially inwardly ing housing cover 32 and a (axially) between the axially outer 31 and the axially inner housing cover 32 arranged intermediate piece 33rd

The three housing parts 31, 32, 33 are screwed together - by means of several stud bolts 27 - and by means of you telementen 16 (at their joints), here using rubber gaskets 16, sealed.

As FIGS. 1 to 3 also show, the housing 7 (and thus the roller 2) undergoes a further support 11, vertical or vertically displaceable / floating, in the rolling stand 1 by means of two support arms screwed to the housing 7 or to the intermediate piece 33 28 ("Ohrwaschl") (see in particular

FIG. 3), which support arms 28 - to the vertical support 11 in the roll stand 1 -, as shown in FIG. 1, rest with bearing surfaces 29 on bending cylinders 30 arranged in the roll stand 1 or their cylinder rods (and thus the bearing assembly 6 / the housing 7 or FIG ., the roller 2 horizontally (translationally) verschiebblich ("floating") is (what the roller 2 (also) in the direction of tape travel a certain range of motion made light).

The - vertical or vertically floating - support 11 of the roller 2 on the bending cylinders 30 also allows that the previous "balancing arms" can be omitted.

As shown in FIG 2, the storage of the roller 2 takes place in La gerbaueinheit 6 or in the housing 7 by means of a Walzenfort rate 22, which (axially) end face of the (axial) Wal zenstirnseite 3 (or 4) - by means of a centering pin 46th centered - is bolted via a formed on the roll extension 22 flange 47 by means of stud bolts 27. The roller extension 22 or its axially free end 48 then passes through an opening 49 which is formed in the inner Ge housing cover 32 in the housing 7, where he or it is rotatably supported by a fixed bearing 8.

By means of seals 16, in this case a plurality of Simmer- or shaft seals 16 (in radial and axial configuration and arrangement), as shown in FIG 3, the housing 7, d. H. the axially inner housing cover 32, opposite the Wal zenfortsatz 22 and its free end 48 (against the environment 15, ie moisture, rolling oil, dust, etc.) sealed, so that a completely encapsulated "bearing housing" 7 for the bearing assembly 6 trains.

On this roll extension 22 (inside the sealed / encapsulated housing 7), as shown in FIG. 2, a tapered roller bearing 13, 14 is arranged, wherein the two-axial outermost or axially widest outer tapered roller bearings 13, 14 are arranged in a 0- arrangement. The other two (axially inner) tapered roller bearing 14 are arranged according to their - axi al - outer neighbors 14 / aligned.

By means of a shaft nut 26, as FIG 2 also shows, the tapered roller bearings 13, 14, d. H. whose inner rings 23, against a (radial) shoulder 50 pressed on the roll extension 22 GE.

Between the inner rings 23 of the tapered roller bearings 13, 14 are precision-manufactured intermediate / spacer rings 25 - to opti mized (, ie equally distributed) force distribution to the individual bearings - arranged.

Between the outer rings 24 of the three axially inner, the support direction forming a tapered roller bearing 14 are also precision-manufactured intermediate / spacer rings 25th - For the optimized (ie uniformly distributed) force distribution on the individual bearings - arranged.

The outer ring 24 of the axially outermost cone roller bearing 14 of these three axially inner, forming a support direction tapered roller bearing 14 is - axi al inside - at a radially inwardly extending from set (shoulder) 51 on the housing spacer 33 at; the outer ring 24 of the axially outermost tapered roller bearing 13 is - axi al outside - at the radially inwardly extending shoulder 51 on the housing intermediate piece 33 and is held on the axially au ßenliegenden housing cover 31.

By coordinating the "inner" and "outer" precision manufactured intermediate / spacer rings 25 support forces - evenly distributed over the outer rings 24 of the tapered roller bearings 14th

- Over the radially inwardly extending paragraph

(Shoulder) 51 discharged into the housing 7.

By the vertical / vertical floating support 11 of the bearing assembly 6 by means of their support arms 28 in the rolling mill 1 and this horizontal (translational) mobility of the bearing assembly 6 and roller 2 and the axial Ver displaceability of the bearing assembly 6 or roller 2 by means of the supporting device 17 against the rolling stand 1 and the roll stand on the one hand and the fixed bearing 8 of the roller 2 in the bearing assembly 6 are "support" and "rotate / rotatory degree of freedom" decoupled in the roller 2, which acts lock-reducing on the storage of the roller 2.

In addition - in this storage of the roller 2 by means of this bearing assembly 6 - in a roll change, the roller 2 on the support arms 28 on the housing 7 of the bearing assembly 6 - even after the lateral opening of the roll stand 1 - held by the bending cylinders 30 in the roll stand 1 - and can at closing of a corresponding device (carriage o. Ä.) Are taken, whereby a roller replacement greatly alleviated.

If the roller extension 22 with the roller 2 "only" screwed, it can - after removal of the roller 2 from the Walzge scaffolding 1 - "immediately" are screwed to a next, ready-to-use roller 2, while the "spent" roller 2 for Overhaul can be given.

As a result, only the actual wearing part (namely, the roll 2 itself) must advantageously be exchanged, while the roll extension 22 can be screwed immediately to the next ready-to-use roll 2 and the arrangement of roll 2, roll extension 22 and bearing assembly 6 can be re-installed in the roll stand 1.

Also, the roller extension 22 can be screwed to rollers 2 of different diameters and is "constantly in use." D. h., It must be purchased only as many roller extensions 22, as actually needed in the rolling stands 1 be (plus any reserve ), while a RESIZE ßere number of rollers 2 (eg, with different diameters for different rolling requirements and adapted to the expected revision period after an exchange from) can be kept.

In addition, the bearing assembly 6 and the related delay realized storage of the roller 2 also has an additional advantage when threading a new Walzgutstückes in the rolling stand 1. Here, namely, the "upper" and "lower" roller 2 on the one hand be moved apart to a avoid mechanical impact through the front of the new rolling stock (risk of damage). This Ausei nanderfahren the rollers 2 is un supported by the bending cylinder 30 which raise the "upper" roller 2 accordingly over their holding arms or lower the "lower" roller 2 from accordingly. In addition, and in contrast to previous free-flying work rolls, the rolls 2 can be pressed by the bending cylinders 30 against the intermediate rolls 34 (driving the rolls 2), so that they are accelerated by them to the rolling stock speed, so that during the subsequent collapse of the roll gap to the target roll thickness results in a correspondingly gentle and gentle roller contacting the rolls 2 with the rolling stock.

If the housing 7 of the bearing assembly 6 encapsulated and abge seals - and so the internal fixed bearing 8 protected from external influences, it extends the life of the bearing elements by a multiple.

Although the invention has been further illustrated and described in detail by the preferred embodiment (s), the invention is not limited by the example (s) disclosed and other variations can be deduced herein without departing from the scope to leave the invention.

LIST OF REFERENCE NUMBERS

1 rolling stand

2 work roll, roller

3 (axial) face of 2

4 (axial) end of 2

5 axial direction

6 bearing assembly

7 (sealed and encapsulated) (bearing) housing

8 fixed storage

9 rotation axis

10 (axial) floating bearing / (axial) support

11 (vertical) floating bearing / (vertical) support 12 (employee) rolling bearing assembly, bearings

13 (first / s) tapered roller bearings

14 (second / -s) tapered roller bearings

15 environment

16 seal / element, Simmerringdichtung, V-ring seal, O-ring seal, labyrinth seal

17 support device

18 axial, cambered face of 17, axially outer

Front side of 20

19 first component of 17

20 second component of 17

21 spring element, coil spring

22 roll extension

23 inner ring (from 12, 13 or 14)

24 outer ring (from 12, 13 or 14)

25 precision manufactured intermediate / spacer ring

26 shaft nut

27 (centered) fitting, (pin) screw

28 retaining element / arm ("ear washer")

29 contact surface

30 supporting element, bending cylinder 31 (axially outboard) housing cover

32 (axially inside) housing cover

33 intermediate piece

34 intermediate roller

35 (axial) end of 7

36 (radially protruding) edge of 19, flange

37 inner extension of 20

38 ring disk

39 radial direction

40 axial displacement

41 axial thickness of 36

42 first (axially inside) end of 21

43 axially outer end face of 31

44 second (axially outboard) end of 21

45 axially inner end face of 20

46 centering pins

47 flange on 22

48 axially free end of 22

49 opening in 32

50 (radial) paragraph on 22

51 radially inwardly extending paragraph at 33rd

Claims

claims

1. rolling mill (1), comprising

- One in the rolling stand (1) floating and about a axi al extending axis of rotation (9) rotatably mounted Ar beitswalze (2) with two axially opposite Stirnsei th (3, 4) and

- At least one bearing assembly (6) which is arranged on one of the two end faces (3, 4) of the work roll (2), using which the work roll (2) in the rolling stand (1) is supported floating and which housing a Ge ( 7) in which the work roll (2) is mounted using a fixed bearing (8),

characterized in that

the bearing assembly (6) has a supporting device (17), by means of which the bearing assembly (6) in the Walzge scaffold (1) is axially supportable.

2. rolling stand (1) according to claim 1,

characterized in that

the fixed bearing (8) using a Wälzlageranord voltage (12), in particular a salaried roller bearing assembly (12) is realized.

3. rolling stand (1) according to one of the preceding claims, characterized in that

the bearing assembly (6), in particular the housing (7), against an environment (15), in particular using a Simmerringdichtung (16) and / or a V-ring seal (16) and / or an O-ring seal (16) and / or a labyrinth seal (16), sealed and / or encapsulated.

4. rolling stand (1) according to one of the preceding claims, characterized in that the supporting device (17) on the housing (7) of Lagerbauein unit (6) is arranged and by means of the supporting device (17) the housing (7) in the roll stand (1) is axially supportable.

5. rolling stand (1) according to one of the preceding claims, characterized in that

the support device (17) has a cambered end face (18) for axial support.

6. rolling stand (1) according to one of the preceding claims, characterized in that

the bearing assembly (6) comprises a spring element (21), in particular a helical spring (21), and the support device (17) has a first and a second component (19, 20), wherein the two components (19, 20) in the axial direction ( 5) are mutually displaceable and in the axial direction (5) using the spring element (21) are clamped.

7. roll stand (1) according to claim 6,

characterized in that

the first component (19) is designed as a hollow cylinder open on one side, which has a radially protruding edge (36) at its open end, and the second component (20) is designed as a hollow cylinder open on one side, which with its inner extension (37) forms the Edge (36) of the first component (19) engages around.

8. rolling stand (1) according to claim 7,

characterized in that

on a radially outer, the work roll (2) facing end face of the second component (20) a Ringschei be (38) is fixed, whose inner diameter is smaller than the diameter of the edge (36) of the first component (19).

9. rolling stand (1) according to one of claims 6 to 8,

characterized in that

the spring element (21) with its first end (42) against the housing (7) of the bearing assembly (6) and with its second end (44) against a radially inner, the Ar beitswalze (2) facing end face (45) of second part (20).

10. rolling stand (1) according to one of the preceding claims, characterized in that

the fixed bearing (8) at one of the two Stirnsei th (3, 4) of the work roll (2) arranged in wesent union axially extending roller extension (22), on which bearing (12) of the fixed bearing (8) are arranged ,

11. rolling stand (1) according to claim 10,

characterized in that

Inner rings (23) of rolling bearings (12), in particular of cone roller bearings (13, 14), on the roll extension (22), in particular using between the inner rings (23) on the roll extension (22) arranged spacer rings (25) and / or a shaft nut (26), are braced.

12. rolling stand (1) according to claim 10 or 11,

characterized in that

the roll extension (22) with the work roll (2) screwed (27), in particular centered screwed (27), or integrally formed with the work roll (2).

13. rolling stand (1) according to one of the preceding claims, characterized in that

the housing (7) has at least one holding element (28) with a support surface (29) for a displaceable support on a support element (30), in particular a bending cylinder (30), in the rolling stand (1).

14. rolling stand (1) according to one of the preceding claims, characterized in that

the housing (7) is in several parts, in particular of two covers (31, 32) and a recorded between the two covers

Intermediate piece (33) is formed.

15. rolling stand (1) according to one of the preceding claims, characterized by

two of the bearing assemblies (6), wherein one of the two La gerbaueinheiten (6) on one of the two end faces (3, 4) of the work roll (2) is arranged and the other of the two La gerbaueinheiten (6) on the other of the two end faces (3,

4) of the work roll (2) is arranged.