EP3560615A1 - Millstand - Google Patents

Abstract

The invention relates to a rolling stand (1) with a work roll (2), which is mounted so as to be able to rotate in the mill stand (1) and has an axially rotatable axis of rotation (9), with two axially opposite end faces (3, 4).

In order to prevent wear on floating rollers, the rolling stand (1) comprises at least one bearing assembly (6) disposed on one (3 or 4) of the two end faces (3, 4) of the work roll (2) using of which the work roll (2) is floatingly supported in the rolling mill (1) (10, 11) and which has a housing (7) in which the work roll (2) is mounted using a fixed bearing (8).

Description

The invention relates to a rolling stand with a work roll floating in the rolling stand and rotatably mounted about an axially extending rotation axis with two axially opposite end faces.

In rolling mills, the shaping of a rolling stock, for example a 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 roll stand depends on the number of rolls, the position of the rolls, the shape of the rolls, 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 more than 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, used, which are 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, ie, the (Float to be stored) element is not clearly fixed in the axial direction. 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 about their respective lateral surfaces / surfaces in 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 strip running direction - laterally, d. H. at its (two) axial end faces of other (also rotatably mounted about their own rotation axes) support rollers or support rollers - by adhesion or friction (roller and backup roller / - roll or the outer surfaces / surfaces roll off) - supported.

D. h., In the axial direction of the rollers results in their - the lateral support (on the axial end faces of the rollers) effecting - form-frictional engagement by (both sides) mounted laterally thereof and oriented in the vertical direction rollers in the form of support rollers or supporting roles. That is, the axes of rotation of these support rollers are aligned normal to the axes of rotation of the rollers to be supported by them and vertically (in the case of horizontally oriented rollers).

Such - the roller axially supporting - sees support - (also) in (with respect to its axis of rotation) axial direction - curved tread / lateral surface / surface ("Barrel shape"), whose diameter-largest circumferential circle (circumferential circles or peripheral circular surfaces are obtained by cuts through the support roller normal to the axis of rotation) with respect to the axis of rotation of the roller is radially offset.

As a result, these (mutual) lateral or axially arranged on the end faces of the rollers supporting rollers each 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 the respective axial end faces of Roller off - and limit their movement in the axial direction.

Optionally, the roller has a mechanical play in the axial direction, so that not always both sides of both support rollers are touched simultaneously, but the roller between them "floats free".

Thus, such "free-floating" rollers of the intermediate rollers, the support rollers / rollers and the rolling stock - non-positively held on the respective contact. 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.

Because of 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 (on frictional / frictional contact) involved surfaces / lateral surfaces (the contacting / contacting surfaces / lateral surfaces wear out mechanically) because that is where they are - instead of a clean rolling movement along a contact line ("line contact", circumference circle) - repeatedly to friction between these lateral support rollers and the end face of the roller.

Naturally, these friction processes also generate high frictional heat - and, in the worst case, lead to the ignition and burning 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 roll stand with at least one work roll mounted therein, which avoids the disadvantages of the prior art, in particular in which such friction and wear behavior is avoided or improved.

This object is achieved by a rolling stand having the features of the independent claim. Advantageous developments of the invention are the subject of dependent claims and the following description.

The mill stand, which has a work roll (in the following only roll) rotatably mounted in the mill stand and rotatable about an axially extending axis of rotation, has at least one bearing assembly which is arranged on one of the two end faces of the work roll 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 by means of solid storage, is "floating" added to the rolling mill.

"Axial" or "axial direction" may be understood - in relation to the axis of rotation of the roller - as its "longitudinal extension" or "longitudinal direction of extension". "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 housing the roller is accommodated by means of the fixed bearing, can also be arranged on each of the two end faces of the roller.

In this case, a bearing arrangement can be understood as a bearing concept or a bearing / bearing arrangement (for mounting a component rotating around an axially rotating axis such as the roller), which or which the component to be supported or the roller in the axial direction (with respect the axis of rotation) clearly positioned.

Such a fixed bearing will thus absorb both radial forces and axial forces (axial forces in both axial directions) and guide them into a component to be supported or the roller "surrounding" construction, such as a housing or the housing of the bearing assembly.

This fixed bearing can in principle be taken up by a single bearing, for example a roller bearing (or possibly also a slide bearing), (here a bearing receives both the axial forces and the radial forces, such as a deep groove ball bearing or a four point bearing with non-displaceably arranged outer bearings. or inner rings) are met.

In the case of very high axial or radial loads, two bearings, for example two roller bearings (or optionally also two plain bearings), are often used to fulfill the fixed bearing function, for example an employed (roller) bearing (Here are two fixed bearing braced against each other, for example, two 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 exclusively axial forces receiving thrust bearing and exclusively the radial forces receiving Radial bearings, such as a cylindrical roller bearing (for the radial forces) with a thrust 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 not fixed or fixed (in the rolling stand) is fixed (ie "floating" (or translationally displaceable) and via the bearing assembly "only" is supported, whereby so then the roller or assembly of roller and bearing assembly is included in the rolling mill), but (translational) degrees of freedom (for the roller) are possible, which is a (translational) position change of the roller allow in the mill, for example, an axial and / or horizontal displaceability of the roller.

As a result, mechanical or thermal changes in length, 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 bearing assembly in the roll stand, so that a horizontal displaceability of the roll can be ensured in the roll stand. About a - in the axial direction - telescopic Slidability of two components relative to each other axial displacement of the roller can be realized, namely, the components - in the axial direction - between bearing assembly and rolling stand or a local roller stand arranged.

The invention is based on the consideration and knowledge that in the storage of the roller with the previous rolling on the rotating roller roller - 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 the wear problem (and the subsequent, following problems) in the support roller.

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

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 - in "fixed" (ie non-rotating) housing or the bearing assembly - the roller rotates relative to the "stationary" housing or bearing assembly.

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 in that the housing or the bearing assembly in the rolling stand, for example in a local rolling stand, "supported or taken up". Between such a "fixed" roll stand and the "stationary" housing or the bearing assembly occurs so no rotational relative movement (more) (, whereas translational shifts (because "floating") are possible.

Put simply, "static support" occurs between the bearing assembly / housing and the rolling stand; the "rotation / the rotational degree of freedom" takes place by means of the fixed bearing between the roller and the housing / bearing assembly. In short, "support" and "rotate / the rotational degree of freedom" are decoupled.

According to a preferred development, it is provided that the fixed bearing is realized by using a roller bearing arrangement, in particular an employed rolling bearing arrangement.

The rolling bearing arrangement forming the fixed bearing can be realized by means of a single (roller) bearing, but in particular - just necessarily in the case of an employed (roller) bearing - by means of two (or possibly even more) (roller) bearings.

If an employed rolling bearing arrangement is provided in a further development, the employment of the rolling bearing arrangement can be realized in the form of an X arrangement or an O arrangement. Conveniently, to increase a Abstützbreite, the employment may be an O-arrangement.

Furthermore, it can also be provided that the rolling bearing arrangement, in particular the employed rolling bearing arrangement, is realized by using at least one first and at least one second set of tapered roller bearings or spherical roller bearings or angular contact ball bearings.

Particularly preferably, a first and a second tapered roller bearing, which are employed against one another in an O-arrangement, can be used.

In order to reduce the load on a single, in particular a single, one another of the (rolling) bearings employed, it is possible to use a plurality of the first and / or second (roller) 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, 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 environmental stress, such as pollution, dust, u. Ä., Protected and thus their life extended.

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

In order to realize a possible defined axial support of the bearing assembly (and so the roller), it is expedient that the support device has an axial, cambered end face to the axial support, for example against a flat plate in the rolling mill ("housing stopper"). Due to the crowning on the axial end face of the support device, the support contact can-ideally-be reduced to a point contact, which is free of radial obstacles / restrictions.

Furthermore, it can be provided that the supporting device has two components (similar to a telescope) which are displaceable relative to one another in the axial direction (thus realizing the (axially) floating mounting of the roller), which can be braced, in particular in the axial direction, in particular using a spring element , It is thus possible to absorb mechanical or thermal changes in length, in particular of the roller, without it leading to jamming u. Ä. comes.

According to a further development, it is provided that the fixed bearing has a roll extension which is arranged on one of the two end faces of the roller and extends essentially axially, on which the fixed bearing "sits", ie. h., Which bearing of the fixed bearing, for example, the (employed) tapered roller bearings, in particular in design with a plurality of first and / or second roller or tapered roller bearings are arranged.

Further development may preferably also be provided that inner rings of the - the fixed bearing forming - rolling bearings, in particular of the tapered roller bearings, in particular in the case of a plurality of first and / or second roller or tapered roller bearings, are braced on the roll extension, in particular using spacer rings arranged on the roller extension between the inner rings and / or a shaft nut.

Also with the outer rings, i. between the outer rings of the - the solid bearing forming - rolling bearings, in particular of the tapered roller bearings, in particular in the case of a plurality of first and / or second roller or tapered roller bearings, such spacers may be provided.

By means of such - in particular precision-made - spacer 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 coordinating the "inner" and "outer" spacers support forces - evenly distributed on the outer rings of the bearings, in particular the tapered roller bearings - are discharged into the housing.

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

Appropriately, the roller extension (at its opposite end opposite the free end) screwed to the roller, in particular screwed centered, or formed integrally with the roller. Especially with a roller barrel screwed to the roller extension is a lighter (more flexible and faster (, thus more cost-effective and time-saving) replacement of a roller, such as wear of the roller or a changed roll gap, possible without further disassembly, in particular the bearing assembly is necessary.

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 displaceable support ("floating support") on a supporting element, in particular a bending cylinder comprises. Preferably, two such retaining elements may be provided on the housing.

Is so - in a roll change - the roller over the or the holding elements - after a lateral opening of the rolling stand - by / on the or the support element / - / Bearing cylinder / -n worn - and then the roller then from a appropriate device (carriage o. Ä.) Are removed from the rolling mill, can be dispensed with the well-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 holding 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 can preferably also be provided that two of the bearing assemblies are provided, each of which is arranged on an end face of the work roll -, whereby the roll can be stored on both sides in the rolling stand.

The previously given description of advantageous embodiments of the invention contains numerous features, which are given in the individual subclaims partially summarized in several. However, these features may conveniently be considered individually and combined into meaningful further combinations. In particular, these features can be combined individually and in any suitable combination with the mill stand according to the invention.

Although some terms are used in the specification or claims in the singular or in conjunction with a number word, the scope of the invention for these terms should not be limited to the singular or the respective number word. Further, 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 obtained, will become clearer and more clearly understood in connection with the following description of the embodiment (s) of the invention, taken in conjunction with the drawings be explained. Embodiment (s) serve to explain the invention and do not limit the invention to combinations of features set forth therein, including functional features. In addition, suitable features of each embodiment may also be considered to be explicitly isolated, removed from one embodiment, incorporated into another embodiment to complement it, and combined with any of the claims.

Show it:

FIG. 1

schematically a structure of a rolling stand with there stored two work rolls;

FIG. 2

a part of a work roll with a bearing assembly (sectional view);

FIG. 3

a part of a work roll with a bearing assembly (perspective).

Roll stand with work roll

FIG. 1 schematically shows a structure of a rolling stand 1 with - there - two - around their respective axially extending 5 axis of rotation 9 rotatably - (floating) mounted work rolls 2 for shaping, ie for rolling, a rolling stock, here a high-strength steel.

The two work rolls 2, each having a diameter of about 180 mm, are - at a pre- or adjustable distance - (with respect to their axes of rotation) parallel to each other in the rolling stand 1 (substantially vertically stacked), resulting in between the two Work rolls 2 forms a nip through which the rolling passes and thereby deformed, that is rolled, is.

Since in such small diameter rollers, the (driving) torque can not be transmitted directly over the (axial end faces of) rollers arranged drive pin, the two work rolls 2, as FIG. 1 shows, by means of parallel (with respect to their respective axes of rotation 9) arranged to the work rolls 2 and driven over their respective lateral surfaces / surfaces in frictional or frictional contact with the (to be driven) work rolls 2 intermediate rollers 34.

Both work rolls 2 (briefly in the following only briefly rolls 2) are essentially identical - and have, as FIG. 1 shows only minor differences in their installation environment in accordance with their arrangement as "upper" and "lower" roll 2. The functional structural elements in both rolls 2 are basically the same.

FIG. 2 and FIG. 3 each show a part of the roller 2 - with their at the (axial 5) end face 3 (or 4) of the roller 2 arranged bearing assembly 6, using which the roller 2 in the rolling stand 1 (floating) stored or received 10, 11 ,

A second (symmetrically identical) bearing assembly 6 is on the other (not visible) (axial) end face 4 (or 3) of the roller 2 - corresponding to the first bearing assembly 6 - arranged (not shown).

The bearing assembly 6 sees how FIG. 2 and FIG. 3 show, a - sealed or encapsulated - (multipart and screwed / -tes) / housing 7, in which the roller 2 by means of a local fixed bearing 8 axially and radially accurately positioned - rotatably - recorded / stored.

The housing 7 (and so the roller 2) in turn is axially beyond its axial 5, the roller 2 facing away from end face 35 by means of a locally arranged support device 17 ("housing stopper") in the roll stand 1 or on a roll stand (not shown) supported 10.

In order 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 FIGS 2 and 3, an axial, cambered end face 18 to the axial support 10 of the roller 2 / Bearing assembly 6 and the housing 7 on the roll stand before.

As FIG. 2 shows, the support device 17 and the "housing stopper" in the axial direction 5 against each other - in the axial direction - slidable components 19, 20 (and so realized / thereby an axially displaceable or axially floating storage / support 10 of the roller 2 in the rolling stand 1), which two components 19, 20 in the axial direction 5 using a spring element 21, here a coil spring 21, are braced (, whereby the roller 2 in the roll stand 1 is axially locked or clamped). It is thus possible to absorb mechanical or thermal length changes, in particular of the roll 2, without causing jamming u. Ä. comes. Also displacements - due to the interaction of the roller 2 with the intermediate rollers 34 and the rolling stock occurring during rolling - can be absorbed thereby.

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

This first component 19 of the supporting device 17 is similar to a hollow cylinder which is open on one side and which, at its axially 5 open (axially 5 outer) end has a radially protruding edge 36 (similar to a flange).

The second component 20 of the support device 17, which is also substantially cylindrical in shape and whose axially outer end face 18 the convex surface 18 of the support device 17 (for axial support in the rolling stand or against the roll stand) provides or forms surrounds, such as FIG. 2 illustrates, at or with its axial 5 inner extension 37 - by means of a (screw-on) washer 38 - the edge 36 of the first member 19 radially 39 from the outside.

Radial 39 within the enclosure provides the second component 20, such as FIG. 2 shows an axial displacement path 40 available, on which the first member 19 and its radial edge 36 axially relative to the second member 20 slidable ("axially floating" 10).

If the axial thickness 41 of the radial edge 36 of the first component 19 measures approximately 7 mm with a provided displacement path 40 of approximately 12 mm, this results in a free axial displaceability of the first component 19 with respect to the second component 20 of approximately 5 mm ,

In order 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 be able to compensate for changes in length, is how FIG. 2 Also shows, the coil spring 21 is provided, which is arranged in or radially 39 within the hollow cylindrical part of the first member 19 open on one side - and whose first (axially 5 inner) end 42 is supported against the axially outer end face 43 43 of the outer housing cover 31 and its second (axially 5 outboard) end 44 against the (axially 5 inner) end face 45 of second component 20 is supported.

As further shown in FIGS. 2 and 3, the housing 7 has three housing parts 31, 32, 33, namely the axially outer housing cover 31, an axially inner housing cover 32 and (axially 5) between the axially outer 31 and the outer housing Axially 5 inner housing cover 32 arranged intermediate piece 33rd

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

As also shown in FIGS. 1 to 3, 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 retaining arms screwed to the housing 7 or to the intermediate piece 33 28 ("Ohrwaschl") (see in particular FIG. 3 ), which holding arms 28 - to the vertical support 11 in the rolling stand 1 -, such as FIG. 1 shows, with bearing surfaces 29 on the rolling stand 1 arranged bending cylinders 30 and their cylinder rods rest (and so the bearing assembly 6 / the housing 7 and the roller 2 horizontally (translationally) verschiebblich ("floating") 11 (what, the roller 2 (also) in the direction of tape movement allows some freedom of movement).

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 FIG. 2 shows the storage of the roller 2 in the bearing assembly 6 or in the housing 7 by means of a roll extension 22, which (axial 5) at the end face of the (axial) Roll end face 3 (or 4) - centered by means of a centering pin 46 - 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 enters the housing 7 via an opening 49, which is formed in the inner housing cover 32, where it is rotatably mounted by means of a fixed bearing 8.

By means of seals 16, in this case a plurality of Simmer- or shaft seals 16 (in the radial 39 and 5 axial configuration and arrangement), is how FIG. 3 shows the housing 7, ie the axially inner housing cover 32, opposite the roller extension 22 or its free end 48 (against the environment 15, ie moisture, rolling oil, dust, etc.) sealed, so that a completely encapsulated "bearing housing" 7 forms for the bearing assembly 6.

On this roll extension 22 (within the sealed / encapsulated housing 7) are as FIG. 2 shows (a (employed) rolling bearing assembly 12 of) four tapered roller bearings 13, 14 are arranged, wherein the two - axially 5 - outermost or axially 5 furthest outermost tapered roller bearings 13, 14 are arranged in an O arrangement. The other two (axially 5 inner) tapered roller bearings 14 are arranged according to their - axially 5 - outer neighbors 14 / aligned.

By means of a shaft nut 26 are how FIG. 2 Also shows, the tapered roller bearings 13, 14, ie their inner rings 23, pressed against a (radial 39) shoulder 50 on the roll extension 22.

Between the inner rings 23 of the tapered roller bearings 13, 14 are precision manufactured intermediate / spacer rings 25 - for optimized (ie, evenly distributed) force distribution on the individual bearings - arranged.

Precision-machined intermediate / spacer rings 25 are also arranged between the outer rings 24 of the three axially 5 inner tapered roller bearings 14, which form a support direction, for the optimized (ie, equally distributed) force distribution on the individual bearings.

The outer ring 24 of the most axially 5 outer tapered roller bearing 14 of these three axially 5 inside, the support direction forming a tapered roller bearing 14 is - axially inside - at a radially 31 inwardly extending shoulder (shoulder) 51 on the housing spacer 33 at; the outer ring 24 of the axially 5 outermost tapered roller bearing 13 is located - axially outside 5 - at the radially inwardly extending paragraph 51 on the housing spacer 33 and is held on the axially outer housing cover 31.

By coordinating the "inner" and "outer" precision-manufactured intermediate / spacer rings 25 supporting forces - evenly distributed over the outer rings 24 of the tapered roller bearings 14 - via the radially 31 inwardly extending shoulder (shoulder) 51 dissipated 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 roll stand 1 and this horizontal (translational) displaceability 11 of the bearing assembly 6 and roller 2 and the axial displaceability 10 of the bearing assembly 6 or roller 2 by means of the support device 17th relative to the roll stand 1 or the roll stand on the one hand and the fixed bearing 8 of the roller 2 in the bearing assembly 6 "support" and "rotate / the rotational degree of freedom" in the roller 2 are decoupled, which has a closing effect 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 then be removed from a corresponding device (carriage or the like), which significantly simplifies a roller replacement.

If the roller extension 22 is "only" screwed to the roller 2, it can be screwed "immediately" onto a next, ready-to-use roller 2, after the roller 2 has been removed from the rolling stand 1, while the "used-up" roller 2 is overhauled 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". That is, only as many roll extensions 22 need be purchased as are actually needed in the rolling stands 1 (plus any reserve), while a larger number of rolls 2 (eg having different diameters for different rolling requirements and adapted to the expected revision period after replacement).

In addition, the bearing assembly 6 and the related realized storage of the roller 2 also provides 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 avoid a mechanical impact through the front of the new rolling stock (risk of damage). This movement apart of the rollers 2 is supported by the bending cylinder 30, which raise the "upper" roller 2 according to their holding arms respectively lower the "lower" roller 2 accordingly.

In addition - and in contrast to previous free-flying work rolls - the rollers 2 can be pressed by the bending cylinders 30 against the (the rollers 2 driving) intermediate rollers 34 so that they are accelerated by these to the Walzgutgeschwindigkeit, so that in the subsequent collapse of the roll gap on the nominal rolling thickness results in a correspondingly gentle and roller-sparing contacting of the rolls 2 with the rolling stock.

If the housing 7 of the bearing assembly 6 encapsulated and sealed - and so the internal fixed bearing 8 protected from external influences, so 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 therefrom without departing from the scope of the invention to leave.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

Stripper, roller

3

(axial) face of 2

4

(axial) face of 2

5

axially

6

A bearing assembly

7

(sealed and encapsulated) (bearing) housing

8th

fixed bearing

9

axis of rotation

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

Surroundings

16

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

17

Support device

18

axial, cambered face of 17, axially outer face of 20

19

first component of 17

20

second component of 17

21

Spring element, coil spring

22

Roller 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

bearing surface

30

Supporting element, bending cylinder

31

(axially outboard) housing cover

32

(axially inside) housing cover

33

connecting piece

34

intermediate roll

35

(axial) face of 7

36

(radially protruding) edge of 19, flange

37

axially 5 inner extension of 20

38

washer

39

radial direction

40

axial displacement

41

axial thickness of 36

42

first (axial 5 inside) end of 21

43

axially outer face of 31

44

second (axial 5 outboard) end of 21

45

axially 5 inner end face of 20

46

spigot

47

Flange on 22

48

axially 5 free end of 22

49

Opening in 32

50

(radial) paragraph on 22

51

radially inwardly extending paragraph on 33rd

Claims (15)

Roll stand (1) having a work roll (2) which is mounted so as to be able to rotate in the roll stand (1) and is rotatable about an axis of rotation (9) extending axially (5) with two axially (5) opposite end faces (3, 4).
marked by
at least one bearing assembly (6) which is arranged on one (3 or 4) of the two end faces (3, 4) of the work roll (2), by means of which the work roll (2) is floatingly supported in the rolling stand (1) ( 10, 11) and which has a housing (7) in which the work roll (2) is mounted using a fixed bearing (8). Roll stand (1) according to claim 1,
characterized in that
the fixed bearing (8) using a rolling bearing assembly (12), in particular an employed rolling bearing assembly (12) is realized. Roll stand (1) according to at least the preceding claim,
characterized in that
the employment of the rolling bearing assembly (12) is realized in the form of an O-arrangement. Roll stand (1) according to at least one of the two preceding claims,
characterized in that
the rolling bearing assembly (12), in particular the employed rolling bearing assembly (12), using at least one first and at least second mutually employed tapered roller bearing (13, 14) is realized. Roll stand (1) according to at least the preceding claim,
signed with
a plurality of the first and / or second tapered roller bearings (13, 14). Roll stand (1) according to at least 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. Roll stand (1) according to at least one of the preceding claims,
characterized in that
the bearing assembly (6) has a supporting device (17), in particular arranged on the housing (7), by means of which the bearing assembly (6), in particular the housing (7), in the roll stand (1) is axially supportable (10). Roll stand (1) according to at least the preceding claim,
characterized in that
the support device (17) has an axial, cambered end face (18) to the axial support (10) ("housing stopper"). Roll stand (1) according to at least one of the two preceding claims,
characterized in that
the supporting device (17) has two components (19, 20) which are displaceable relative to each other in the axial direction ("axially floating") (10)), which in particular in the axial direction (5), in particular by using a spring element (21), are braced. Roll stand (1) according to at least one of the preceding claims,
characterized in that
the fixed bearing (8) has a roller extension (22) arranged on one (3, or 4) of the two end faces (3, 4) of the work roll (2) and extending substantially axially (5), on which bearing (12 ) of the fixed bearing (8) are arranged. Roll stand (1) according to at least the preceding claim,
characterized in that
Inner rings (23) of rolling bearings (12), in particular of tapered 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. Roll stand (1) according to at least one of the two preceding claims,
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). Roll stand (1) according to at least one of the preceding claims,
characterized in that
the housing (7) has at least one retaining element (28) ("ear washer") with a bearing surface (29) for a displaceable support ("floating support" (11)) on a support element (30), in particular a bending cylinder (30), in the roll stand (1). Roll stand (1) according to at least one of the preceding claims,
characterized in that
the housing (7) is in several parts, in particular of two covers (31, 32) ("inner / outer cover") and an intermediate piece (33) accommodated between the two covers ("chock"). Roll stand (1) according to at least one of the preceding claims,
characterized in that
the work roll (2) has a diameter in the range of 150 mm to 200 mm and / or
marked by
two of the bearing assemblies (6), each of which is arranged on an end face (3, 4) of the work roll (2).

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