JP2023508899A - Methods and roll units for changing roll configurations in roll stands - Google Patents

Abstract

The present invention is a method for changing a roll configuration in a roll stand to a cassette configuration, the roll stand having at least two work rolls (3) and at least one work roll (3) of the roll stand when changing configuration. The rolls (2) are exchanged into a roll unit as an exchange set, the exchange set having at least three exchange rolls, all of which are supported in a common cassette (5), which cassette at least partly substantially correspond to the contours of the chocks (4) of the respective work rolls (3) to be replaced. The invention furthermore relates to roll units in the form of exchange sets for carrying out this method.

Description

The present invention relates to a method for changing roll configuration in a roll stand. The invention furthermore relates to a roll unit as an exchange set for carrying out this method.

Strip thickness reduction is particularly important for rolling flat metal products. The forming machines required for this are called horizontal roll stands or roll stands. Roll stands are used during hot rolling of slabs into hot strip and for cold rolling of cold strip. In this case, different roll stands are used which differ with regard to size, number and arrangement of rolls and with respect to the equipment of the technical conditioning system and with respect to roll cooling and roll lubrication.

Stand structures are usually differentiated according to the number and arrangement of rolls. Perhaps the most frequently used stand construction is the so-called four-roll stand (quattro, 4-high mill) with two work rolls and two backup rolls. Six-high roll stands (Xext, 6-Hi-Mill) are often chosen for cold rolling high-strength steels with particularly high quality requirements. These six-roll stands have additional intermediate rolls and possibly associated support devices. Eighteen-high and twenty-high roll stands with work rolls having relatively small diameters (multi-roll stands, e.g. 18 high mill) are likewise popular. These roll stands are considered for cold rolling high strength steels.

A roll stand typically includes a work roll pair with associated work roll chocks, blocks for guiding the work roll chocks through work roll bending and work roll shifting devices, a backup roll pair with associated backup roll chocks, a roll A roll adjustment system for setting/adjusting the gap, i.e. the gap between the upper and lower work rolls, a load measuring device for measuring the rolling load, a roll housing, a drive system, and the work rolls. It has a cooling lubricating device and a device for guiding the rolled material.

Rolling steels with special alloys and high strength grades requires the use of small work roll diameters to achieve the required final thickness for the metal strip. Multi-roll stands are equipped with corresponding work rolls with small diameters, but these diameters are limited with respect to the permissible entry side of the rolled stock. Since such flat products usually make up only a relatively small part of the remaining production of the rolling train, often only 4-roll stands or 6-roll stands, which are retrofitted as necessary, are used. Retrofitting is expensive.

A typical roll stand in the form of a multi-roll stand for rolling metal strip is known, for example, from WO2004052568.

From EP 2 451 592 a 4-high/6-high/18HS roll stand is known which allows rolling in different operating modes and roll diameters in one roll stand with minimal changeover times. In this case, it is contemplated that the work roll set of the 4-high/6-high stand is replaced by an intermediate roll set including lateral support rollers and the work rolls of the 18HS stand of cassette construction. Such a conversion from a 4-high or 6-high configuration to a multi-roll stand is relatively expensive. Despite the cassette design, which essentially minimizes drying time, it is necessary to retrofit drive trains, bend and shift systems, and the like. When changing the roll configuration, first an intermediate roll set has to be introduced and then a new work roll with a smaller diameter has to be introduced.

Another prior art is US Pat. known from the book.

International Publication No. 2004052568 pamphlet EP 2451592 U.S. Pat. No. 2,039,959 FR-A-284657 JP-A-05-228504 U.S. Pat. No. 7,481,089 U.S. Patent Application Publication No. 20060010951

SUMMARY OF THE INVENTION The problem underlying the present invention is a method and apparatus for changing roll configurations that allows conversion of a roll stand from a work roll having a larger diameter to a work roll having a smaller diameter with minimal retrofit costs. is to provide

The problem is solved by the features of the method according to claim 1 and the features of the roll unit according to claim 7 .

Advantageous configurations of the invention can be seen from the dependent claims.

According to an aspect of the present invention, a method for changing the roll configuration in a roll stand preferably comprises replacing at least one work roll of the roll stand with a roll unit as a replacement set, the replacement set comprising at least In a roll stand having three exchange rolls, which exchange rolls are supported in a common cassette, the contour of which substantially corresponds at least partially to the contour of the chocks of the work rolls to be exchanged. provided to This makes it possible to mount the cassette in the roll housing of the roll stand to be replaced without further modification measures.

A cassette in the sense of the invention is to be understood as a modular unit for the simultaneous bearing of several rolls or rollers.

The cassette according to the invention has two bearing housings for the rolls of the exchange set and the necessary support rollers and/or support bearings. Configuration changes, such as work roll changes, can be accomplished within minutes because the contour of the bearing housing matches the contour of the work roll chock to be removed sufficiently or perfectly.

A work roll chock is generally understood to be a bearing housing for a work roll that fits on a roll stand.

Preferably, exactly three rolls of the exchange set and additionally required support rollers and/or support bearings are both supported in a single cassette.

Preferably, the configuration change is implemented in a 4-high or 6-high roll stand. The change of work rolls can be carried out by a change set having work rolls whose diameter is smaller than the diameter of the work roll to be replaced.

Within the scope of the invention, said configuration changes can also be made with a duo stand (2 high), so that this duo stand can then be converted into a multiroll stand.

Preferably, in the method according to the invention, all work rolls are exchanged, but within the scope of the invention it is also conceivable to exchange only one work roll with the corresponding cassette.

In a preferred variant of the method according to the invention, provision is made for the sum of the roll diameters of all change rolls of the change set to correspond to the respective maximum or minimum diameter of the work roll to be changed.

Expediently, the exchange set has at least a first and a second auxiliary roll, preferably the first auxiliary roll has a larger diameter than the work rolls of the exchange set, preferably the second Auxiliary rolls have diameters that match the work rolls of the replacement set.

The roll unit according to the invention expediently comprises a work roll and a first and a second auxiliary roll, which are arranged in a common cassette. In this case the auxiliary roll assumes the function of a vertical backup roll. A triple construction in the sense of the invention has one work roll and two auxiliary rolls, where the necessary support rolls and/or support bearings for laterally guiding the work rolls and/or auxiliary rolls are not considered.

Within the scope of the invention, such triple configurations also have lateral support rolls and/or support bearings.

In an expedient configuration of the invention, the cassette has two bearing housings for the work rolls and the auxiliary rolls, each bearing housing having a contour which substantially corresponds to the contour of the work roll chocks of the roll stand. It is contemplated to provide.

The work roll and the first and second auxiliary rolls are arranged vertically one above the other at the mounting position of the cassette. The second auxiliary roll and work roll of the replacement set can have approximately the same diameter. Preferably, the first auxiliary roll has a larger diameter than the work rolls of the replacement set. The first auxiliary roll can be, for example, the driven roll of the exchange set.

As already mentioned before, the exchange set can have support rollers and/or support bearings laterally supporting the work roll and/or the first and second auxiliary rolls.

Expediently, the driven rolls of the exchange set are equipped with drive journal adapters. The drive journal adapter enlarges the auxiliary roll coupling sleeve diameter to fit the existing drive spindle coupling section.

Preferably, the cassette is formed rotationally symmetrical about the longitudinal axis of the symmetrical or driven auxiliary roll with respect to a horizontal plane in the mounting position. This allows the cassette to be mounted rotated 180° about its longitudinal axis if required, so that, for example, the position of the second auxiliary roll of the exchange set and the work roll of the exchange set, or , the positions of the first and second auxiliary rolls can be interchanged. This makes it possible to delay post-processing due to wear.

Due to the symmetrical construction of the cassettes it is also possible to exchange the upper and lower cassettes with each other.

The roll unit according to the invention can advantageously be used both in one-way mode and in reversing mode, both for single stands and for rolling mills with multiple stands. Both the method according to the invention and the roll unit are suitable for retrofitting or upgrading existing rolling plants, as well as for equipping new plants in a special way.

The invention is explained below by means of embodiments illustrated in the drawings.

Schematic of a 4-high or 6-high roll configuration retrofitted according to the prior art FIG. 1B is a schematic representation of the roll configuration illustrated in FIG. 1A, with the work rolls replaced by one replacement set each according to the invention; FIG. 1B is a schematic diagram corresponding to FIG. 1A, in which the drive of the work rolls is illustrated diagrammatically; FIG. 1B is a diagram corresponding to FIG. 1B, in which the drive of the exchange set or cassette is schematically illustrated; Schematic of a prior art retrofit 4-high or 6-high roll configuration with driven pack-up rolls or intermediate rolls. FIG. 3A is a schematic representation of the roll arrangement shown in FIG. 3A, wherein the work rolls in the arrangement according to FIG. 3A have been replaced by an exchange set or cassette according to the invention; Schematic representation of an exchange set or cassette according to the invention with optional support rollers Sectional view along line VV in FIG. 4 Sectional view along line VI-VI in FIG.

First, refer to FIGS. 1A and 1B. There, a roll stand 1 in a 4-high or 6-high configuration is shown. A 6-high configuration vertical backup roll 2' is shown in dashed lines. The following description of the invention applies to both possible configurations of roll stand 1 .

In the simplest case, the roll stand 1 has two vertical backup rolls 2 in a 4-high configuration and two work rolls 3 between them, each supported in a work roll chock 4 .

According to the invention, when the roll stand 1 is converted to a configuration with a small work roll diameter, the work rolls 3 are replaced by a work roll 3', a first auxiliary roll 6 and a second roll, respectively, each having a relatively small diameter. It is replaced by a cassette 5 with auxiliary rolls 7 . Cassette 5 further comprises a first bearing housing 5A and a second bearing housing 5B, which accommodate the ends of work roll 3' and auxiliary rolls 6, 7 respectively. Since the shape of the bearing housings substantially corresponds to the shape of the work roll chocks 4 respectively, the work rolls 3 together with the associated work roll chocks 4 can be replaced without further retrofitting or modification measures. Both work rolls 3 in the arrangement according to FIG. 1A are replaced by cassettes 5 respectively. Thus, in order to dry the roll stand 1 from the configuration of FIG. 1A to the configuration according to FIG. 1B, a total of two cassettes 5 need to be provided.

The embodiment according to FIGS. 2A and 2B substantially corresponds to the embodiment according to FIGS. 1A and 1B, but here the work roll 3 is respectively driven in the configuration without change set and in the configuration with change set: It is envisaged that each first auxiliary roll 6 is driven. At this point it is emphasized that the same parts are provided with the same reference numerals in all the embodiments.

The sum of the diameters of all vertically arranged rolls of the cassette 5 approximately corresponds to the diameter of the driven work roll 3 to be replaced. With regard to the structure of cassette 5, reference is made in particular to FIG. As can be seen from FIG. 4, the cassette 5 comprises a relatively small work roll 3' and above it a driven first auxiliary roll 6 arranged vertically in line with the work roll 3' and in line therewith. It has a second auxiliary roll 7 arranged whose diameter approximately corresponds to the diameter of the work roll 3'. Preferably, the work roll 3' and the second auxiliary roll 7 have the same diameter. The cassette 5 shown in FIG. 4 is rotationally symmetrical with respect to the longitudinal central axis of the driven auxiliary roll 6 . Each of the vertically aligned rolls is laterally supported by support rollers 8 .

The diameter of the work rolls 3 of the 6-high configuration may be, for example, approximately 470-430 mm, whereas the diameter of the work rolls 3' of the replacement set may comprise, for example, a diameter of 140-120 mm. The first auxiliary roll 6 may for example have a diameter of 190-180 mm, whereas the diameter of the second auxiliary roll 7 preferably corresponds to the diameter of the work rolls 3' of the replacement set. The support roller 8 can have a diameter of about 120 mm, for example. The rolling speed achievable by the roll unit according to the invention can be in the range between about 100 and 2500 m/min, preferably between about 1000 and 1500 m/min.

As can be seen from FIGS. 2, 4 and 6, in the preferred variant of the roll unit according to the invention, provision is made for the first auxiliary roll 6 to be designed as a driven roll. For this purpose, this first auxiliary roll is provided at one end with a drive journal adapter 9, as can be seen in FIG. It is enlarged to fit a roll-side coupling portion (not shown) of the drive spindle. This takes into account the situation in which the drive journals of the work roll to be replaced usually have a diameter adapted to the drive torque to be transmitted.

In the case of the variant shown in FIGS. 3A and 3B of the invention, it can be envisaged that each of the intermediate rolls 2 is driven. In this case, the work roll 3 of the roll configuration to be replaced is not driven. It is therefore not necessary to drive an exchange set provided as a triplet in the form of cassettes 5 .

1 roll stand 2 4-high configuration backup roll or 6-high configuration intermediate roll 2' 6-high configuration backup roll 3 Work roll of roll stand to be replaced 3' Replacement set work roll 4 Work roll chock 5 Cassette 5A First roll Bearing housing 5B Second bearing housing 6 First auxiliary roll 7 Second auxiliary roll 8 Support roller 9 Drive journal adapter 10 Coupling sleeve

The present invention relates to a method for changing roll configuration in a roll stand. The invention furthermore relates to a roll unit as an exchange set for carrying out this method.

Strip thickness reduction is particularly important for rolling flat metal products. The forming machines required for this are called horizontal roll stands or roll stands. Roll stands are used during hot rolling of slabs into hot strip and for cold rolling of cold strip. In this case, different roll stands are used which differ with regard to size, number and arrangement of rolls and with respect to the equipment of the technical conditioning system and with respect to roll cooling and roll lubrication.

Stand structures are usually differentiated according to the number and arrangement of rolls. Perhaps the most frequently used stand construction is the so-called four-roll stand (quattro, 4-high mill) with two work rolls and two backup rolls. Six-high roll stands (Xext, 6-Hi-Mill) are often chosen for cold rolling high-strength steels with particularly high quality requirements. These six-roll stands have additional intermediate rolls and possibly associated support devices. Eighteen-high and twenty-high roll stands with work rolls having relatively small diameters (multi-roll stands, e.g. 18 high mill) are likewise popular. These roll stands are considered for cold rolling high strength steels.

A roll stand typically includes a work roll pair with associated work roll chocks, blocks for guiding the work roll chocks through work roll bending and work roll shifting devices, a backup roll pair with associated backup roll chocks, a roll A roll adjustment system for setting/adjusting the gap, i.e. the gap between the upper and lower work rolls, a load measuring device for measuring the rolling load, a roll housing, a drive system, and the work rolls. It has a cooling lubricating device and a device for guiding the rolled material.

Rolling steels with special alloys and high strength grades requires the use of small work roll diameters to achieve the required final thickness for the metal strip. Multi-roll stands are equipped with corresponding work rolls with small diameters, but these diameters are limited with respect to the permissible entry side of the rolled stock. Since such flat products usually make up only a relatively small part of the remaining production of the rolling train, often only 4-roll stands or 6-roll stands, which are retrofitted as necessary, are used. Retrofitting is expensive.

A typical roll stand in the form of a multi-roll stand for rolling metal strip is known, for example, from WO2004052568.

From EP 2 451 592 a 4-high/6-high/18HS roll stand is known which allows rolling in different operating modes and roll diameters in one roll stand with minimal changeover times. In this case, it is contemplated that the work roll set of the 4-high/6-high stand is replaced by an intermediate roll set including lateral support rollers and the work rolls of the 18HS stand of cassette construction. Such a conversion from a 4-high or 6-high configuration to a multi-roll stand is relatively expensive. Despite the cassette design, which essentially minimizes drying time, it is necessary to retrofit drive trains, bend and shift systems, and the like. When changing the roll configuration, first an intermediate roll set has to be introduced and then a new work roll with a smaller diameter has to be introduced.

Another prior art is US Pat. known from the book.

A method and a device according to the preamble of claim 1 are known from JP-A-55-027473. Another prior art is known from US Pat. No. 2,039,959.

International Publication No. 2004052568 pamphlet EP 2451592 U.S. Pat. No. 2,039,959 FR-A-284657 JP-A-05-228504 U.S. Pat. No. 7,481,089 U.S. Patent Application Publication No. 20060010951 JP-A-55-027473 U.S. Pat. No. 2,039,959

SUMMARY OF THE INVENTION The problem underlying the present invention is a method and apparatus for changing roll configurations that allows conversion of a roll stand from a work roll having a larger diameter to a work roll having a smaller diameter with minimal retrofit costs. is to provide

The problem is solved by the features of the method according to claim 1 and the features of the roll unit according to claim 6 .

Advantageous configurations of the invention can be seen from the dependent claims.

According to an aspect of the present invention, a method for changing the roll configuration in a roll stand preferably comprises replacing at least one work roll of the roll stand with a roll unit as a replacement set, the replacement set comprising at least In a roll stand having three exchange rolls, which exchange rolls are supported in a common cassette, the contour of which substantially corresponds at least partially to the contour of the chocks of the work rolls to be exchanged. provided to This makes it possible to mount the cassette in the roll housing of the roll stand to be replaced without further modification measures.

A cassette in the sense of the invention is to be understood as a modular unit for the simultaneous bearing of several rolls or rollers.

The cassette according to the invention has two bearing housings for the rolls of the exchange set and the necessary support rollers and/or support bearings. Configuration changes, such as work roll changes, can be accomplished within minutes because the contour of the bearing housing matches the contour of the work roll chock to be removed sufficiently or perfectly.

A work roll chock is generally understood to be a bearing housing for a work roll that fits on a roll stand.

Preferably, exactly three rolls of the exchange set and additionally required support rollers and/or support bearings are both supported in a single cassette.

Preferably, the configuration change is implemented in a 4-high or 6-high roll stand. The change of work rolls can be carried out by a change set having work rolls whose diameter is smaller than the diameter of the work roll to be replaced.

Within the scope of the invention, said configuration changes can also be made with a duo stand (2 high), so that this duo stand can then be converted into a multiroll stand.

Preferably, in the method according to the invention, all work rolls are exchanged, but within the scope of the invention it is also conceivable to exchange only one work roll with the corresponding cassette.

In a preferred variant of the method according to the invention, provision is made for the sum of the roll diameters of all change rolls of the change set to correspond to the respective maximum or minimum diameter of the work roll to be changed.

Expediently, the exchange set has at least a first and a second auxiliary roll, preferably the first auxiliary roll has a larger diameter than the work rolls of the exchange set, preferably the second Auxiliary rolls have diameters that match the work rolls of the replacement set.

The roll unit according to the invention expediently comprises a work roll and a first and a second auxiliary roll, which are arranged in a common cassette. In this case the auxiliary roll assumes the function of a vertical backup roll. A triple construction in the sense of the invention has one work roll and two auxiliary rolls, where the necessary support rolls and/or support bearings for laterally guiding the work rolls and/or auxiliary rolls are not considered.

Within the scope of the invention, such triple configurations also have lateral support rolls and/or support bearings.

In an expedient configuration of the invention, the cassette has two bearing housings for the work rolls and the auxiliary rolls, each bearing housing having a contour which substantially corresponds to the contour of the work roll chocks of the roll stand. It is contemplated to provide.

The work roll and the first and second auxiliary rolls are arranged vertically one above the other at the mounting position of the cassette. The second auxiliary roll and work roll of the replacement set can have approximately the same diameter. Preferably, the first auxiliary roll has a larger diameter than the work rolls of the replacement set. The first auxiliary roll can be, for example, the driven roll of the exchange set.

As already mentioned before, the exchange set can have support rollers and/or support bearings laterally supporting the work roll and/or the first and second auxiliary rolls.

Expediently, the driven rolls of the exchange set are equipped with drive journal adapters. The drive journal adapter enlarges the auxiliary roll coupling sleeve diameter to fit the existing drive spindle coupling section.

Preferably, the cassette is formed rotationally symmetrical about the longitudinal axis of the symmetrical or driven auxiliary roll with respect to a horizontal plane in the mounting position. This allows the cassette to be mounted rotated 180° about its longitudinal axis if required, so that, for example, the position of the second auxiliary roll of the exchange set and the work roll of the exchange set, or , the positions of the first and second auxiliary rolls can be interchanged. This makes it possible to delay post-processing due to wear.

Due to the symmetrical construction of the cassettes it is also possible to exchange the upper and lower cassettes with each other.

The roll unit according to the invention can advantageously be used both in one-way mode and in reversing mode, both for single stands and for rolling mills with multiple stands. Both the method according to the invention and the roll unit are suitable for retrofitting or upgrading existing rolling plants, as well as for equipping new plants in a special way.

The invention is explained below by means of embodiments illustrated in the drawings.

Schematic of a 4-high or 6-high roll configuration retrofitted according to the prior art FIG. 1B is a schematic representation of the roll configuration illustrated in FIG. 1A, with the work rolls replaced by one replacement set each according to the invention; FIG. 1B is a schematic diagram corresponding to FIG. 1A, in which the drive of the work rolls is illustrated diagrammatically; FIG. 1B is a diagram corresponding to FIG. 1B, in which the drive of the exchange set or cassette is schematically illustrated; Schematic of a prior art retrofit 4-high or 6-high roll configuration with driven pack-up rolls or intermediate rolls. FIG. 3A is a schematic representation of the roll arrangement shown in FIG. 3A, wherein the work rolls in the arrangement according to FIG. 3A have been replaced by an exchange set or cassette according to the invention; Schematic representation of an exchange set or cassette according to the invention with optional support rollers Sectional view along line VV in FIG. Sectional view along line VI-VI in FIG.

First, refer to FIGS. 1A and 1B. There, a roll stand 1 in a 4-high or 6-high configuration is shown. A 6-high configuration vertical backup roll 2' is shown in dashed lines. The following description of the invention applies to both possible configurations of roll stand 1 .

In the simplest case, the roll stand 1 has two vertical backup rolls 2 in a 4-high configuration and two work rolls 3 between them, each supported in a work roll chock 4 .

According to the invention, when the roll stand 1 is converted to a configuration with a small work roll diameter, the work rolls 3 are replaced by a work roll 3', a first auxiliary roll 6 and a second roll, respectively, each having a relatively small diameter. It is replaced by a cassette 5 with auxiliary rolls 7 . Cassette 5 further comprises a first bearing housing 5A and a second bearing housing 5B, which accommodate the ends of work roll 3' and auxiliary rolls 6, 7 respectively. Since the shape of the bearing housings substantially corresponds to the shape of the work roll chocks 4 respectively, the work rolls 3 together with the associated work roll chocks 4 can be replaced without further retrofitting or modification measures. Both work rolls 3 in the arrangement according to FIG. 1A are replaced by cassettes 5 respectively. Thus, in order to dry the roll stand 1 from the configuration of FIG. 1A to the configuration according to FIG. 1B, a total of two cassettes 5 need to be provided.

The embodiment according to FIGS. 2A and 2B substantially corresponds to the embodiment according to FIGS. 1A and 1B, but here the work roll 3 is respectively driven in the configuration without change set and in the configuration with change set: It is envisaged that each first auxiliary roll 6 is driven. At this point it is emphasized that the same parts are provided with the same reference numerals in all the embodiments.

The sum of the diameters of all vertically arranged rolls of the cassette 5 approximately corresponds to the diameter of the driven work roll 3 to be replaced. With regard to the structure of cassette 5, reference is made in particular to FIG. As can be seen from FIG. 4, the cassette 5 comprises a relatively small work roll 3' and above it a driven first auxiliary roll 6 arranged vertically in line with the work roll 3' and in line therewith. It has a second auxiliary roll 7 arranged whose diameter approximately corresponds to the diameter of the work roll 3'. Preferably, the work roll 3' and the second auxiliary roll 7 have the same diameter. The cassette 5 shown in FIG. 4 is rotationally symmetrical with respect to the longitudinal central axis of the driven auxiliary roll 6 . Each of the vertically aligned rolls is laterally supported by support rollers 8 .

The diameter of the work rolls 3 of the 6-high configuration may be, for example, approximately 470-430 mm, whereas the diameter of the work rolls 3' of the replacement set may comprise, for example, a diameter of 140-120 mm. The first auxiliary roll 6 may for example have a diameter of 190-180 mm, whereas the diameter of the second auxiliary roll 7 preferably corresponds to the diameter of the work rolls 3' of the replacement set. The support roller 8 can have a diameter of about 120 mm, for example. The rolling speed achievable by the roll unit according to the invention can be in the range between about 100 and 2500 m/min, preferably between about 1000 and 1500 m/min.

As can be seen from FIGS. 2, 4 and 6, in the preferred variant of the roll unit according to the invention, provision is made for the first auxiliary roll 6 to be designed as a driven roll. For this purpose, this first auxiliary roll is provided at one end with a drive journal adapter 9, as can be seen in FIG. It is enlarged to fit a roll-side coupling portion (not shown) of the drive spindle. This takes into account the situation in which the drive journals of the work roll to be replaced usually have a diameter adapted to the drive torque to be transmitted.

In the case of the variant shown in FIGS. 3A and 3B of the invention, it can be envisaged that each of the intermediate rolls 2 is driven. In this case, the work roll 3 of the roll configuration to be replaced is not driven. It is therefore not necessary to drive an exchange set provided as a triplet in the form of cassettes 5 .

1 roll stand 2 4-high configuration backup roll or 6-high configuration intermediate roll 2' 6-high configuration backup roll 3 Work roll of roll stand to be replaced 3' Replacement set work roll 4 Work roll chock 5 Cassette 5A First roll Bearing housing 5B Second bearing housing 6 First auxiliary roll 7 Second auxiliary roll 8 Support roller 9 Drive journal adapter 10 Coupling sleeve

Claims (14)

A method for changing the roll configuration in a roll stand, wherein the roll stand has at least two work rolls (3) and at least one work roll (2) of the roll stand is replaced when the configuration is changed. It is exchanged into a roll unit as a set, the exchange set having at least three exchange rolls, all of which are supported in a common cassette (5), the contour of which is at least partially substantially conforming to the contours of the work roll chocks (4) of the respective work rolls (3) to be replaced. 2. Method according to claim 1, characterized in that the configuration change is carried out on a 4-high or 6-high roll stand. 1 or 2, characterized in that the replacement of the work rolls (3) is carried out by means of a replacement set comprising work rolls (3') whose diameter is smaller than the diameter of the respective work roll (3) to be replaced. 2. The method described in 2. 1-, characterized in that the sum of the roll diameters of all vertically arranged change rolls of the change set corresponds approximately or completely to the maximum or minimum diameter of the work roll (3) to be changed. 4. The method of any one of 3. A method according to any one of the preceding claims, characterized in that the exchange set comprises first and second auxiliary rolls (6, 7). The first auxiliary roll (6) has a larger diameter than the work rolls (3') of the replacement set, preferably the second auxiliary roll (7) matches the work rolls (3') of the replacement set. A method according to any one of claims 1 to 5, characterized in that it comprises a diameter of A roll unit as a replacement set for carrying out the method according to any one of claims 1 to 6, said roll unit comprising a work roll (3') and first and second auxiliary rolls ( 6, 7), which are supported in a common cassette (5), which contains two bearing housings for the work roll (3') and the auxiliary rolls (6, 7). and each of these bearing housings has a contour which substantially corresponds to the contour of the work roll chocks (4) of the roll stand. 8. A work roll (3') according to claim 7, characterized in that the work roll (3') and the first and second auxiliary rolls (6, 7) are arranged vertically one above the other in the mounting position of the cassette (5). roll unit. Roll unit according to claim 7 or 8, characterized in that the second auxiliary roll (7) and the work roll (3') of the exchange set have approximately the same diameter. A roll unit according to any one of claims 7 to 9, characterized in that the first auxiliary roll (6) has a larger diameter than the work rolls (3') of the replacement set. Roll unit according to any one of claims 7 to 10, characterized in that the first auxiliary roll (6) is driven. Claim characterized in that the exchange set has support rollers (8) and/or support bearings laterally supporting the work roll (3') and/or the first and second auxiliary rolls (6, 7). The roll unit according to any one of items 7 to 11. A roll unit according to any one of claims 7 to 12, characterized in that the driven rolls of the exchange set are provided with drive journal adapters (9). Rolling unit according to any one of claims 7 to 13, characterized in that the cassette (5) is formed rotationally symmetrical about a longitudinal central axis.

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