DE10015285C2 - Rolling mill for rolling metallic pipes, bars or wires - Google Patents

Abstract

A rolling mill for rolling metallic pipes, rods or wires with several, interchangeable, interchangeable roll stands and at least three rolls per roll stand is improved in such a way that it is more heavily loaded and faster and with less effort, time and costs per se changing requirements of the company can be adapted. For this purpose, all rolls of all roll stands are driven by their own motor via their own drive shaft and the roll shafts are designed in several parts so that they can be replaced and reused without dismantling the roll stand housing and roll bearing.

Description

The invention relates to a rolling mill for rolling metallic pipes, Rods or wires with several, arranged in a straight line one behind the other Roll stands that change together, in groups or individually let and each of them at least three, one rolling axis star-shaped surrounding rollers.

Such a rolling mill is already known from US 3 316 746 A1. The Drive for all rollers, whose axes of rotation have the same axial direction, takes place there together. So there are rolls from several roll stands through one common gear driven. Consequently, the roller speeds are the Roll stands dependent on each other, so that always to avoid rolling errors certain roller diameters must be adhered to exactly, resulting in a leads to large consumption of rollers. In addition, the roll stands are there one behind the other, but spaced a little apart. That has to Consequence that the inevitable thickened end portions that are unusable and must be scrapped, are particularly long and economical Is big. Furthermore, the replacement of roll stands is this Rolling mill cumbersome and time consuming.

A rolling mill of this type is also known from WO 98/06515 A1 has a plurality of rolling stands arranged one behind the other in a straight line, from each of which has three rollers which surround a rolling axis in a star shape. The Roll stands there cannot be completely replaced, however. It can only a part of them, namely a roller carrier, in which the rollers are radial are slidably mounted, are replaced. Is the Roll carriers outside the roll stand and thus also the rolling mill, then the rollers can no longer be held in their rolling positions and neither can can be set. In addition, only a few have, and only those on the outlet side  last roll stands, each with its own drive shaft are driven. The remaining mill stands, a much larger number, have only one drive shaft each, which then directly connects the roller shaft of that roller drives whose axis of rotation extends horizontally. The other two Roller shafts are the torque of the drive shaft by means of bevel gears transmitted, which are arranged on all roller shafts. So that the bevel gears staying in engagement with each other is a noteworthy feature of these rolling stands radial adjustment of the roller shafts and thus the rollers is not provided. at However, the rollers in the last two roll stands on the outlet side can be adjust radial direction because they are individually driven and radially movable are stored.

This well-known rolling mill has the major disadvantage that it is far most roll stands, namely those with only one drive shaft, are not sufficient can be heavily loaded. The reason for this is that the Roller bearings to absorb the forces and the bevel gears to transmit the Torque can be arranged within an equilateral triangle which is formed by the axes of rotation of the rollers. That’s why The external dimensions of the roller bearings and those of the bevel gears are limited and consequently the size of the rolling forces that can be absorbed and that of the transmissible ones Torque. An enlargement of the triangle of the axes of rotation would be too larger rollers. Larger rollers increase the distance between the rolling stands, which is an increase in the proportion of unusable because not dimensionally stable end sections of the rolling stock. Also are larger rollers are more expensive to procure and process. Also revealed With larger rolls, higher investment costs for the entire rolling mill. Thus, enlarging the triangle of the axes of rotation is not a solution to the Problem.

In addition to their inadequate load capacity, the rolling stands have only one Drive shaft the disadvantage that the training inside them Roll stand housing is particularly complex because in addition to the roller bearings the bevel gears are still housed within the triangles of the axes of rotation  Need to become. A radial adjustment of the rollers is possible, but only with to achieve an even more constructive effort. The one already without roller adjustment, high design effort leads to many individual parts and thus to high manufacturing and operating costs.

The complex training inside the mill stand housing has the further Disadvantage that changing the rollers is complicated and time consuming. To for this purpose you have to open the mill stand housing and the Partially dismantle the roller bearing and the bevel gears. After this A corresponding assembly effort is then required for changing the rolls. Around In order to save assembly work and time, the rollers are installed reworked, but then additional special machines are required.

Because by far the largest part of the known rolling mill in question The rolling mill has multiple roll stands with only one drive shaft at a time all disadvantages of these roll stands. So the rolling mill is just insufficiently resilient, has complex and therefore expensive mill stands and requires a lot of effort when changing and reworking the rollers.

In order not to have to accept more disadvantages, the well-known Rolling mill with only the radial adjustability of the rolls in the roll stands a drive shaft and therefore not used in most roll stands. However, with such rolling stands, this leads to significantly higher costs, because at the rollers are used up faster. With rolling stands without or without sufficient radial adjustability must be worn rollers a larger material removal can be reworked. Even unfavorable Rolling programs require more extensive such rolling stands Material erosion.

DE 22 59 143 C3 discloses a roll stand with at least three, one Rolling axis surrounding rollers in a star shape, in which the rollers by means of multi-part roller shafts can be stored and replaced. Of the Nothing is disclosed on the rolling mill in which this roll stand is to be used.  

It remains open whether all, only a few and which scaffolding locations with this Roll stand to be equipped. Each of the rollers has its own Drive shaft so that the drive bevel gears are omitted, but on the nature of their The drive and the number of motors are not implemented. The roller shafts are formed in several parts in this known roll stand, which is why the rollers can be replaced without dismantling the roll stand housing and roller bearings can be. The mill stand housing is also made up of several parts.

The invention is based on the problem of a rolling mill for rolling to create metallic pipes, rods or wires of the listed Do not adhere to disadvantages, but which can be loaded more heavily and which can faster and with less effort, time and costs per se can be adapted to changing requirements of the company.

This problem is solved according to the invention by a rolling mill for rolling of metallic pipes, rods or wires with several, in a straight line narrow rolling stands arranged one behind the other, which can quickly be put together have several or individually replaced, each of which has at least three, has a roll axis surrounding rollers in a star shape, which is in all roll stands are each driven by their own motor and drive shaft, the rollers being supported by means of multi-part roller shafts and without Disassembly of the roll stand housing and roller bearings must be replaced. It is primarily the combination of the features mentioned that is important.

This creates a rolling mill that has the same dimensions Rolls and roll stands can be subjected to significantly higher loads because all rolls of all Roll stands on the rolling mill have their own drive shaft, directly from one own motor are driven and so the bevel gears for transmitting the Torques on the individual roller shafts are eliminated. So that will be within of the equilateral triangles formed by the axes of rotation of the rollers Free spaces that the bevel gears would otherwise need. These free spaces can now be used in whole or in part for the roller bearings, so that they are larger and thus have a more stable design, without having to come from the axes of rotation of the rollers  formed triangles and thus the rollers themselves have to enlarge. The Larger roller bearings therefore allow higher rolling forces with rollers of the same size and consistently small distance between the mill stands. In addition, they are on the Effective torques now roll from the transferability of the Bevel gears are independent and can also become larger. Hence, Roll rolled material with higher strength or with a lower rolling temperature. Also the roll stands can be manufactured with less effort and more easily mount, saving the bevel gears and other individual parts.

The multi-part design of the roller shafts allows axial clamping of the Roll each between the facing end faces of two Partial waves. This avoids strength-reducing connections between Rollers and roller shafts with feather keys and similar elements as they usually do be used often. Above all, however, the multi-part training enables Roller shafts a quick roller change. This is the axial clamping force canceled between the two partial waves, these moved only slightly apart and the rollers can be removed from the roll stand in the radial direction become. Then another roller can be placed in the radial direction Insert the roll stand between the two partial shafts and clamp it there. A Disassembly of the roll stand housing and / or the roller bearings is carried out Not. Such a quick roll change, in turn, enables one to overall, less rolling stands get along, because the preparation time takes one new use in the roll stands not in the rolling mill becomes so short that they will be available again when they are in use existing roll stands must be replaced. It is therefore at the new rolling mill hardly requires more than two sets of rolling stands his. In addition, the quick and easy roll change can also Reworking the rollers in the installed state and the required Special machine unnecessary, the rollers open for reworking Standard machine tools can be quickly removed and installed. There in addition, all of the rolling stands on the rolling mill, together or in groups of several  can also be quickly replaced individually, it remains with few and only short downtimes of the rolling mill.

In a preferred embodiment of the invention, the roll stands have a one-piece mill stand housing. That is with the invention Individual drive of the rollers and the resulting lack of bevel gears possible. As a result, the mill stand housings can be significantly less Produce effort because the work carefully and in several steps and parts to be sealed to the outside are eliminated, as is the numerous holes for dowel pins and connecting screws, which otherwise the must hold the two parts of the mill stand together.

In the rolling train according to the invention, the rolls can be used by everyone Roll stands, radially adjustable from only some or none of the roll stands his. Which of these options is chosen depends on the Rolling program and the respective operating conditions for which the Rolling mill should be suitable. However, it is particularly advantageous if all of them Roll stands the roller bearings arranged in eccentric bushings and these to radial adjustment of the rollers to rotate gradually and in several Rotational positions are to be locked. In this way stand in all rolling stands several distances between the roll axis and the axes of rotation of the rolls Available. Rollers with a worn work surface can be used in such a Rolling mill even to the same caliber shape and size as the original one reworked and used again. On the rework inevitably arise smaller ideal roller diameters and thus other distances between the roll axis and roll rotation axes can be Adjust the roll stands by turning the eccentric bushes. The rollers can not only be reused anywhere, but also on the same Scaffolding and with the same caliber opening. Leave the relatively expensive rollers use themselves so much more often and make better use of what the roller costs significantly lowers. The radial adjustment of the rollers can be done with the Rolling mill according to the invention without bevel gears with little effort  to reach. It is preferably outside the rolling line, for example in a Scaffolding workshop carried out.

It is also recommended to use at least the last two on the outlet side Roll stands to arrange the roller bearings in eccentric bushings and these to infinitely variable radial adjustment of the rollers even when installed ready for use Roll stands can be continuously and radially adjustable, independently whether the rollers in the other roll stands are gradually radial are adjustable or not. This has the advantage that within the Production area of the rolling mill all conceivable finished dimensions of the rolling stock can be generated and in any order. There is even a limited change in the finished dimensions without Change of rolls or roll stands possible. But also with this In terms of the design, it makes sense to roll all or some of the roll stands cannot be continuously adjusted radially when the roll stand is ready for use, to provide a gradual, radial adjustment outside the rolling mill.

As a rule, the number of roll stands whose rolls are ready for operation built-in roll stand are not continuously radially adjustable, larger than that Number of roll stands with infinitely radially adjustable rolls. In order to you reduce the effort and costs involved in manufacturing the rolling mill, by minimizing the number of complex rolling stands with continuously radial adjustable rollers can be used.

It is also appropriate if the roll stands, the rolls of which are ready for operation built-in roll stand are not continuously radially adjustable and their Rollers are continuously radially adjustable, different ideas Have roller diameters. This improves the possibilities of a new one Use of reworked rollers and also saves roller costs.

It makes sense if all of the stand positions for roll stands are continuously radial adjustable and for roll stands with not continuously radially adjustable rolls  are suitable. All roll stands can then be placed on all stand spaces insert and adapt the rolling mill to the respective requirements.

In a recommended embodiment, the drive shafts extend the rollers and the shafts of their motors coaxial to the respective axis of rotation of the rollers. It is particularly advantageous if the motors, the shafts of which are at an angle to Form horizontals and assume the same angular position with each other, on, on or are arranged in a common frame. That simplifies the Devices for coupling and uncoupling the rolling stands with the drive of their Rolling when changing the roll stands. Also the change of the roll stands themselves is accelerated and the uneconomical downtimes of the rolling mill are shortened. Are expediently on, on or in the common Frame between the motors and the drive shafts of the rollers Reduction gear arranged. It has proven advantageous that Reduction gear train as a planetary gear.

In a further embodiment of the invention, the reduction gears are several or all motors with the same angular position combined in one housing, that is designed as a common framework. Here you can also have several or all motors with the same angular position on the as a common frame flange the trained housing of the reduction gear. Another one Embodiment are the motors and reduction gears of one or several rolls, whose roll axes of rotation form an angle to the horizontal, each combined to form a drive unit.

It is particularly favorable if the or the common framework or Drive units in the direction of the axes of rotation of the rollers assigned to them are to be shifted linearly. But it is also possible, the one or the common Frame or drive units around a parallel to the rolling axis To pivot the swivel axis. It can be used to swivel the common Frame or drive units can also be provided an articulated gear.  

In addition, it is advantageous if the or the above the rolling axis arranged common frame or drive units from one Support bridge made of concrete. Such a suspension bridge offers everyone Ways to attach the frame or drive units and affects damping out on possible vibrations.

So that the roll stands can be easily and quickly both together and closed removed several or individually from the rolling line of the rolling mill and if necessary can be exchanged for other roll stands a scaffold changing device is provided. At a recommendable Training is one or more roll stands on one or more Scaffold changing carts, from which they can move into the rolling line move in and onto whom they are moving out of the rolling line to let. The scaffolding changing car takes over the relocation of the Roll stands in or against the rolling direction along the rolling mill. You leave but also to transport the roll stands from the rolling mill to one Use the scaffolding workshop and back again.

In this embodiment of the rolling mill, the drive for moving the Roll stands below the motors or below motors with downstream reduction gears for the rollers with themselves horizontally extending axes of rotation may be arranged, the drive being a number horizontally extending working cylinder, which optionally on them assigned roll stands on a stand changing carriage or in a Scaffolding of the rolling mill can be coupled. Alternatively, you can the drive for moving the roll stands two horizontally extending Enter working cylinders in the area of the inlet and outlet end faces of the Rolling mill are arranged and one on the operating side of the rolling stands arranged, extending parallel to the rolling axis, transverse to this Detect movable transport bar on which each roll stand is optional can be coupled.  

In another embodiment of the rolling mill there are one or more Rolling stands on one or more stand changing carriages, with which the rolling stands can be moved in and out of the rolling line. Here serve the Scaffold changing trolley also for holding the rolling stands during rolling.

In the drawings, the invention is based on a few exemplary embodiments shown. It shows:

Figure 1 shows a rolling mill according to the invention in plan view.

Fig. 2 is a section along the line II-II of Fig. 1;

Figure 3 is a rolling mill according to Figure 2, but with a pivotable upper roller drive..;

FIG. 4 shows a rolling mill corresponding to FIG. 3, but with a different roll changing device and in a side view;

Fig. 5 is a rolling mill corresponding to Fig. 3, but with an articulated gear for pivoting the upper roller drive.

In Fig. 1, a rolling mill 1 has a larger number of rolling stands 2 , some of which are arranged closely one behind the other on a stand changing carriage 3 in the situation shown. The roll stands 2 on the stand change carriage 3 come from a stand workshop, where the roll stands 2 are prepared for their use in the rolling mill 1 and from where they have been placed on the stand change carriage 3 in the required sequence. Tracks 4 lead to Walzstraße 1 . In front of this stands a second stand change carriage 5 with empty stand holders 6 , because its roll stands 2 are located in the rolling mill 1 and therefore cannot be seen in the top view of FIG. 1. These roll stands 2 are moved, as required, all or several or individually after use from the rolling mill 1 onto the stand changing carriage 5 , which is then moved to the side so that the stand changing carriage 3 with its other rolling stands 2 can travel in front of the rolling train 1 . Then the present on the stand changing carriage 3 and needed in the rolling mill roll stands 1 2 can be brought to their stand positions in the rolling mill. 1

In FIG. 2, the scaffold is changing carriage 5 in cross-section and seen with dotted lines the position of a roll stand 2 is shown on the framework change carriage 5, there nachden from the rolling mill 1 has been removed. In fact, the roll stands 2 in FIG. 2 are still in their operating position. Three rolls 7 are arranged in a star shape in the roll stands 2 , which thereby surround a straight horizontal roll axis 8, which, however, can only be represented in FIG. 2 as an intersection.

All rollers 7 are driven separately. The drive takes place via a drive shaft 9 from a motor 10 . Reduction gears 11 are provided between the drive shafts 9 and the motors 10 and are designed here as planetary gears. The drive shafts 9 , motors 10 and reduction gears 11 shown without reference numerals are assigned to an adjacent roll stand 2 .

At each stand is a horizontally extending working cylinder 12 is arranged below the motors 10 , the reduction gear 11 and the drive shafts 9 for the rollers 7 with horizontally extending axes of rotation, which can optionally be coupled to the associated roller stand 2 , so that this from the Rolling mill 1 can be pushed out onto a scaffold changing carriage 3 , 5 or pulled into rolling mill 1 from such a scaffolding changing carriage 3 , 5 .

The motors 10 and reduction gears 11 , the shafts of which form an angle to the horizontal and which assume the same angular position with one another, are arranged on or on a common frame 13 . The frames 13 can be displaced linearly in the direction of the axes of rotation of the rollers 7 assigned to them by means of further working cylinders 14 . Couplings 15 allow the drive shafts 9 to be separated and coupled from roller shafts 16 which are located almost completely in the roll stands 2 and are therefore barely recognizable in FIG. 2. When the working cylinders 14 are pressurized appropriately, the common frame 13 and with them the motors 10 , the reduction gear 11 and the drive shafts 9 are moved so far away from the roll stands 2 that the parts of the couplings 15 are separated and the roll stands 2 are horizontal, e.g. B. can be moved to the scaffolding car 5 . The clutches 15 of the horizontally extending drive shafts 9 are also released . In a corresponding manner, the roller shafts 16 of the roll stands 2 can be coupled again to the drive shafts 9 after the roll stands 2 are in their operating position. The frames 13 are then moved from the working cylinders 14 to the roll stands 2 until the parts of the couplings 15 engage again.

The common frame 13 arranged above the rolling axis 8 in FIG. 2 is held by a supporting bridge 17 made of concrete. When the embodiment of Fig. 3, this is not the case. There, the common frame 13 arranged above the rolling axis 8 is held by at least one swivel arm 18 which is to be swiveled about a swiveling axis 19 extending parallel to the rolling axis 8 , the swiveling movement being able to be carried out both by working cylinders and by motors, which are shown in FIG . 3 but not shown. The pivoting movement of the upper frame 13 not only releases the couplings 15 , but it can be so extensive that the area above the roll stands 2 is free and the roll stands 2 are gripped from above with an indoor crane and can be replaced. It is then possible to do without a scaffold changing car 3 , 5 . Incidentally, the embodiment corresponds to FIG. 3, FIG. 2.

FIG. 4 shows the rolling mill of FIG. 3, but with another device for quickly changing the roll stands 2 . A transport bar 20 is arranged on the operating side of the roll stands 2 and extends parallel to the rolling axis 8 and is displaceable transversely to the latter. The transport bar 20 is driven by two working cylinders 21 which can be pressurized, one of which is arranged in the area of the inlet and outlet side end faces of the rolling mill 1 , so that only one of the two can be seen in FIG . With a pawl 22 arranged at each stand, pivotable about a joint 23 , each roll stand 2 can optionally be coupled to the transport bar 20 . To this end, the pawl 22 , which can be pivoted by hand, engages in a recess 24 in the relevant roll stand 2 . When changing roll stands 2 , the transport bar 20 is moved together with the coupled roll stands 2 onto the stand changing carriage 5 . Then the transport bar 20 is uncoupled from its working cylinders 21 and these are moved back to their starting position. The scaffolding change carriage 5 can then be moved to the scaffolding workshop together with the transport bar 20 . The other scaffold changing carriage 3 with prepared rolling stands 2 also has a transport bar 20 to which the working cylinders 21 are coupled as soon as the scaffolding changing carriage 3 is in the correct position in front of the rolling mill 1 . The prepared roll stands 2 can then be moved into the rolling mill 1 with the aid of the transport bar 20 .

The embodiment of the rolling train of FIG. 5 differs from that of FIG. 3 only by an articulated gear 25 for holding and moving the upper frame 13 instead of the swivel arm or arms 18 .

Claims (23)

1. Rolling mill for rolling metallic pipes, rods or wires with several rolling stands ( 2 ) arranged in a straight line one behind the other, which can be quickly replaced together, several or individually, and each of which has at least three, a rolling axis ( 8 ) in a star shape has surrounding rollers ( 7 ), each of which is driven by its own motor ( 10 ) and its own drive shaft ( 9 ) in all roll stands ( 2 ), the rolls ( 7 ) being supported by means of multi-part roll shafts ( 16 ) and without dismantling the roll stand housing and Roller bearings are to be replaced. 2. Rolling mill according to claim 1, characterized in that the roll stands ( 2 ) have a one-piece roll stand housing. 3. Rolling mill according to claim 1 or 2, characterized in that in all rolling stands ( 2 ) the roller bearings are arranged in eccentric bushings and these are gradually rotated for radial adjustment of the rollers ( 7 ) and locked in several rotational positions. 4. Rolling mill according to claim 1 or 2, characterized in that the roller bearings are arranged in eccentric bushes at least in the two last roll stands ( 2 ) on the outlet side and these are also used for continuously variable radial adjustment of the rolls ( 7 ) even with the roll stands ( 2 ) installed ready for operation are adjusted. 5. Rolling mill according to claim 4, characterized in that in all or some rolling stands ( 2 ), whose rollers ( 7 ) are not continuously radially adjustable when the rolling stand ( 2 ) is ready for operation, a gradual, radial adjustment outside the rolling train ( 1 ) is provided is. 6. Mill train according to claim 4 or 5, characterized in that the number of roll stands (2), the rollers (7) are non-continuously in ready built-roll stand (2) radially adjustable, greater than the number of roll stands (2) with infinitely radially adjustable rollers ( 7 ). 7. Rolling train according to one of claims 4 to 6, characterized in that the roll stands (2), the rollers (7) are not continuously radially adjustable in ready built-roll stand (2) and whose rollers (7) are continuously radially adjustable , have different ideal roller diameters. 8. Rolling mill according to one of claims 4 to 7, characterized in that all stand spaces for roll stands ( 2 ) with continuously radially adjustable and for roll stands ( 2 ) with non-continuously radially adjustable rolls ( 7 ) are suitable. 9. Rolling mill according to one of claims 1 to 8, characterized in that the drive shafts ( 9 ) of the rolls ( 7 ) and the shafts of their motors ( 10 ) extend coaxially to the respective roll axis of rotation. 10. Rolling mill according to one of claims 1 to 9, characterized in that the motors ( 10 ), the shafts of which form an angle to the horizontal and assume the same angular position with one another, are arranged on, on or in a common frame ( 13 ). 11. Rolling mill according to claim 10, characterized in that on, on or in the common frame ( 13 ) between the motors ( 10 ) and the drive shafts ( 9 ) of the rollers ( 7 ) reduction gears ( 11 ) are arranged. 12. Rolling mill according to claim 11, characterized in that the reduction gear ( 11 ) are designed as a planetary gear. 13. Rolling mill according to claim 11 or 12, characterized in that the reduction gear ( 11 ) of several or all motors ( 10 ) are combined with the same angular position in a housing which is designed as a common frame ( 13 ). 14. Rolling mill according to claim 13, characterized in that several or all motors ( 10 ) are flanged with the same angular position on the housing of the reduction gear ( 11 ) formed as a common frame ( 13 ). 15. Rolling mill according to claim 11 or 12, characterized in that the motors ( 10 ) and reduction gear ( 11 ) of one or more rolls ( 7 ), the roll axes of rotation of which form an angle to the horizontal, are each combined to form a drive unit. 16. Rolling mill according to one of claims 10 to 15, characterized in that the or the common frame ( 13 ) or drive units are linearly displaceable in the direction of the roller axes of rotation assigned to them. 17. Rolling mill according to one of claims 10 to 15, characterized in that the common frame or frames ( 13 ) or drive units are to be pivoted about a pivot axis ( 19 ) extending parallel to the rolling axis ( 8 ). 18. Rolling mill according to claim 17, characterized in that articulated gears ( 25 ) are provided for pivoting common frames ( 13 ) or drive units. 19. Rolling mill according to one of claims 10 to 18, characterized in that the or the above the rolling axis ( 8 ) arranged common frame ( 13 ) or drive units are held by a supporting bridge ( 17 ) made of concrete. 20. Rolling mill according to one of claims 1 to 19, characterized in that one or more rolling stands ( 2 ) stand on one or more stand changing carriages ( 3 , 5 ), from which or which they move into the rolling line and on or which can be moved out of the rolling line. 21. Rolling mill according to claim 20, characterized in that the drive for moving the roll stands ( 2 ) below the motors ( 10 ) or below motors ( 10 ) with downstream reduction gear ( 11 ) for the rollers ( 7 ) with horizontally extending Axes of rotation is arranged, and that it has a number of horizontally extending working cylinders ( 12 ), which can optionally be coupled to them associated rolling stands ( 2 ) on a stand changing carriage ( 3 , 5 ) or in a stand holder ( 6 ) of the rolling train ( 1 ). 22. Rolling mill according to claim 20, characterized in that the drive for moving the roll stands ( 2 ) has two horizontally extending working cylinders ( 21 ) which are arranged in the region of the inlet and outlet-side end faces of the rolling mill ( 1 ) and one on the Detect the operating side of the roll stands ( 2 ), which extend parallel to the roll axis ( 8 ) and can be displaced transversely to the roll bar ( 20 ) and to which each roll stand ( 2 ) can optionally be coupled. 23. Rolling mill according to one of claims 1 to 19, characterized in that one or more rolling stands ( 2 ) stand on one or more stand changing carriages ( 3 , 5 ) with which the rolling stands ( 2 ) can be moved into and out of the rolling line are.