EP2444176B1 - Axial/radial ring rolling system and method of operating such an axial/radial ring rolling system - Google Patents

Description

The invention relates to an axial / Radialringwalzwerk with motor drives and control and / or regulating devices.

Furthermore, the invention relates to a method for operating such an axial / radial ring rolling mill.

In known axial / Radialringwalzwerken the axial rolling and radial rolling mill at a greater distance from one another and that are offset by 180 °, that is, the Axialringwalzwerk and the Radialringwalzwerk are arranged diametrically opposite each other.

This arrangement of the rolling mills to each other makes loading and unloading, especially for large rings to be rolled, problematic.

In addition, when it comes to rolling large rings control technical limits. Since the rolling mill has to travel long distances, long hydraulic cylinders are required, which must carry out the adjustment movements. This inevitably leads to control engineering problems due to low rigidity. To minimize the vibrations that occur, you have to accept large following errors. However, the position of the ring to be rolled in the axial caliber also determines the taper roller speed. The control systems and the ring bearing control of centering arms hardly ensure that the ring to be rolled is stable. This can lead to rejects or costly rework.

From the German patent application 1 019 635 an axial / radial rolling mill is already known, in which the radial rolling mill is arranged with its feed device at an obtuse angle diametrically opposite to a roller. As a result, the available space for the ring is unfavorably concentrated. In addition, it is questionable how a very small ring could be rolled by such a mill, especially since the roller is only pivotable in the known type. This means that with very small rings, the roller can not or not completely roll the ring. Such a rolling mill hardly seems to be industrially applicable.

From the DE 10 19 635 B An axial / radial ring rolling mill is previously known. In this, the rollers of the Axialringwalzwerkes and the rolls of Radialringwalzwerkes are arranged directly next to each other.

The invention has for its object, an axial / Radialringwalzwerk according to the assumed genus in such a way that rings of large diameter of one meter to 15 meters, preferably from three meters to eight meters, can be rolled with great accuracy, even if these rings should be profiled.

Furthermore, the invention has for its object to provide a method for operating such axial / Radialringwalzwerkes.

The task concerning the axial / radial ring rolling mill is solved by the features of claim 1 . Here, the Axialringwalzwerk is directly, that is arranged in the smallest possible spatial distance, in addition to the Radialringwalzwerk such that the machine frame of the Radialringwalzwerkes and thus the longitudinal axis of the Radialringwalzwerkes is arranged at an acute angle to Axialringwalzwerkgerüst and thus to the longitudinal axis of the Axialringwalzwerkes.

The invention thus differs fundamentally from the prior art by Axialringwalzwerk and Radialringwalzwerk are arranged directly next to each other. Depending on the machine size, the machine frame stands at an acute angle of, for example, 20 to 90 degrees to the axial frame. The axial frame has a rotary and linear axis. The rotation axis automatically moves so that the tapered roller axis always points to the center of the growing ring. The linear axis moves so that at the beginning of the intersection of the tapered rollers is in the Dommitte. As the ring diameter increases, the tapered rollers advance until the ring to be rolled is in the rearward position of the tapered rollers. Depending on the size of the machine, the linear movement of the axial stand can amount to zero to two thousand millimeters, preferably zero to one thousand millimeters.

On the main roll stand is a rolling table for receiving the ring blank. If the ring to be rolled is then rolled larger, it is mainly on a roller table or on storage rails, which also serves after rolling to remove the rolled ring. This allows a very short and easy unloading, even for large rings. In addition, eliminates the dangerous and expensive pit between axial and radial scaffolding. The main roller can be moved axially and locked in any position. This allows profiled rings to be rolled into a finished profile only in a pre-profile at the end of the rolling process can be. In this case, only the profiled main roller or the inner profiling of the dome, or both, must be moved axially. This succeeds in a forming heat, and the ring can remain lying on the rolling table. In order to enable easy shifting, instead of the previous engine-gearbox-clutch combination, a directly driving radial piston hydraulic drive can be provided.

All in all, it is thus possible to eliminate the disadvantages existing in the prior art completely and to propose a compact axial / radial ring rolling, with which even very large rings of, for example, twelve meters to roll exactly and can be safely removed.

The invention has particular inventive significance for axial / Radialringwalzwerke with motor drives and control and / or regulating devices for controlling the rolling operations, wherein the Axialringwalzwerk is located immediately adjacent to the Radialringwalzwerk, such that the machine frame of the Radialringwalzwerkes and the Axialringwalzwerkgerüst on the same outside of the are arranged to roll ring and the machine frame of the Radialringwalzwerkes and thus dik länpsachse the radialringwalzwerkes at an acute angle to Axialringwalzwerkgerüst and thus laupsachse del axialringwelzwerkesachse is arranged.

The Axialringwalzwerk is a substantially vertically extending framework, which is associated with a positively guided in the vertical direction of the scaffold on guides slide, the carriage by a motor drive height adjustable and in the particular desired altitude is also locked.

It is also inventive that the carriage is also assigned a transversely / horizontally adjustable carriage, which is also assigned a motor-controllable rotary drive, for example a rotary cylinder, which has an angular tilt T - V of the upper and lower tapered rollers by 20 degrees to 90 degrees , ie, in each case by 10 degrees to 45 degrees, allowed on both sides of a longitudinal center axis of the upper and lower tapered roller, such that the upper tapered roller both in the vertical direction X and Y and transverse thereto A - B, and in the direction T and V, adjustable and controllable and in the desired height and angle position motor is also locked.

Within the scope of the inventive concept are also axial / radial ring rolling mills, in which the upper roller roller opposite lower roller is adjustable except in the direction X or Y in all axes as the upper tapered roller.

Furthermore, it is inventive that the upper roll mandrel bearing can be lowered together with the carriage and the drive and that the lowering takes place parallel to the rolling mandrel bearing and the drive.

Further inventive embodiments are described in the claims 2 to 15.

Claim 2 describes an advantageous embodiment in which the linear movement of the Axialgerüstes with the tapered roller is zero to two thousand millimeters, preferably zero to one thousand millimeters. This makes it possible, even very large rings with outer diameters of, for example, twelve meters to tolerances to roll.

In claim 3 , an embodiment is described in which the device comprises a rolling table for receiving the ring blank. As the diameter increases, however, the ring predominantly rests on a roller table or on the support rails, which also serves to remove the rolled ring after the end of rolling. At the beginning of rolling, a secure support and guidance of the ring blank is achieved by the rolling table, which may have a weight of 500 to 100,000 kilograms, preferably from 1,000 to 50,000 kilograms, and has a temperature of up to 1250 ° Celsius during hot rolling.

Advantageously, according to claim 4 the rolling mills, a conveyor device, for example, a roller table, a lifting beam or other continuous conveyor, assigned, wherein the conveyor device for transport and for loading and unloading of the ring is used. This allows a very short and easy unloading, even for large rings of up to 12000 millimeters outside diameter and a weight of up to 50000 kg. The already mentioned expensive and dangerous pit between Axial and Radial framework is no longer necessary.

In the embodiment according to claim 5 all or some of the rollers of the roller table are driven by a motor. As a result, the removal of the finished rolled ring is facilitated.

A particularly advantageous embodiment describes claim 6, wherein the main roller is vertically adjustable motor and lockable in the respective position and arranged such that can be rolled in different calibers.

Claim 7 describes an embodiment in which the radial rolling mill and / or the axial rolling mill are driven by directly driving radial piston motors or geared motors.

If an embodiment is selected according to claim 8 , the axial and Radialringwalzwerk two spaced apart roller tables are assigned, in which some or all tubes are driven by a motor.

This allows according to claim 9, the arrangement of a laser measuring device between the two roller tables.

In the embodiment according to claim 10 , this laser measuring device in two, preferably arranged at right angles to each other planes, in particular in the vertical and / or horizontal plane, adjustable and arranged.

The motor drive for the laser measuring device may be an alternately on both sides by pressure medium pressure, in particular hydraulically acted upon piston-cylinder unit. Such a motor drive operates reliably and precisely and also allows the respective locking of the laser device in the respectively predetermined position - Claim 11.

It is particularly advantageous if, according to claim 12, the laser measuring device can be lowered by a motor under the level of the roller conveyor.

If an embodiment according to claim 13 is selected, the laser measuring device makes it possible to measure the outer and / or inner ring diameter and the ovality of the ring, wherein the values can be forwarded online to a control and / or regulating device.

Particularly advantageous is an embodiment according to claim 14, wherein the laser measuring device is designed such that it measures the taper and the outer profile of the rings and passes the measured values to the control and / or regulating device, wherein the positions of the mandrel bearings can be corrected on the basis of the measured values ,

In a preferred embodiment of the invention according to claim 15 are preferably arranged on opposite sides in the region of the radial ring rolling mill and the Axialringwalzwerkes ever a motorized centering device with a centering and a centering. These centering rollers, and adapted to the outer periphery of the rings to be rolled to touch rings, wherein the rotational signals caused thereby to a control and / or regulating device of the motor drives of the axial rolling passed and the speed is to be influenced accordingly.

All control and / or regulating devices of the motor drives of the radial ring rolling mill and the axial ring rolling mill as well as all adjusting devices for these rolling mills and for the laser device can be in a CNC control be included, which has stored to a central control and / or control station in an electronic memory for the different to be rolled ring blanks predetermined signal and guide values with the tolerances and correspondingly the drives of the rolling mills, their positions and the drives of the roller tables and the Laser device, preferably included in a sequence control, controls and / or regulates.

The object concerning the method is solved by the features of method claim 16 . Here, the axis of rotation of the Axialringwalzwerkes by the control and regulating device with the tapered roller axis always on the center of the growing ring, with increasing ring diameter, the Axialringwalzwerk linearly moves to the center of the ring until the rolled ring is arranged in the horizontal position of the tapered roller.

Fig. 1

ein Axial-/Radialringwalzwerk in perspektivischer Darstellung;

Fig. 2

das aus Fig. 1 ersichtliche Axial-/Radialringwalzwerk mit einem bereits teilweise gewalzten Ring;

Fig. 3

eine Draufsicht auf das aus Fig. 1 ersichtliche Axial- /Radialringwalzwerk;

Fig. 4

eine Draufsicht zu Fig. 2;

Fig. 5

eine Einzelheit aus den Fig. 1 bis 4 mit einer Lasermessvorrichtung, teils im Schnitt, und

Fig. 6

eine ähnliche Darstellung wie Fig. 5, allerdings mit einem bereits teilweise gewalzten Ring, aufliegend auf einem Rollgang.

In the drawing the invention - partly schematically - exemplified. Show it:

Fig. 1

an axial / Radialringwalzwerk in perspective view;

Fig. 2

the end Fig. 1 apparent axial / Radialringwalzwerk with an already partially rolled ring;

Fig. 3

a plan view of the Fig. 1 apparent axial / radial ring rolling mill;

Fig. 4

a plan view too Fig. 2 ;

Fig. 5

a detail from the Fig. 1 to 4 with a laser measuring device, partly in section, and

Fig. 6

a similar representation as Fig. 5 , but with an already partially rolled ring, resting on a roller table.

In the drawing, the reference numeral 1 denotes an axial ring rolling mill and the reference numeral 2 denotes a radial ring rolling mill. The Axialringwalzwerk 1 has a substantially vertically extending framework 3, which is associated with a positively guided in the vertical direction, ie in the direction of X or Y on the frame 3 via guides 4 slide 5. The carriage 5 is powered by a motor, for. Example, a feed cylinder 6, which is designed as a piston-cylinder unit, acted upon by fluid pressure, in particular by a hydraulic medium and thus controlled, whereby then the carriage 5 in the direction of X or Y, for example, by 1000 millimeters in height adjustable and in the respective desired altitude also on the Zustellzylinder 6 or the like can be locked. The feed cylinder 6 is supplied via a line 7, a suitable fluid under pressure, for example hydraulic fluid, controlled.

The carriage 5 is also associated with an adjustable in the direction A or B carriage 8, which is also associated with a motor-controlled rotary drive, for example, a rotary cylinder 9, the pivoting of the upper and lower tapered roller 10 in the direction T or V by an angle from 20 to 90 degrees, that is each allowed by 10 to 45 degrees on both sides of a longitudinal center axis 11 of the upper and lower tapered roller 10. In this way, the upper tapered roller 10 can be both in the direction of X or Y and in the direction A or B, but also in the direction T and V, adjust and control and in each selected Lock the height and angle position by motor. To adjust in the direction of A or B is a motor drive, z. B. a Linearverstellzylinder 12, which is also designed as a piston-cylinder unit and the lines 13 and 14, a suitable fluid under pressure, in particular a hydraulic medium, is controlled fed.

The rotary cylinder 9 is also a suitable fluid under pressure, preferably a hydraulic medium, for example via the line 15, supplied controlled. From the drawing it can be seen that the longitudinal center axis 11, which also coincides with the longitudinal center axis of the upper tapered roller 10, in the illustrated embodiment at an acute angle of 20 to 90, preferably from 30 to 70, to be rolled to a ring blank 16 (FIG. Fig. 5 ) is adjustable and lockable. An already completely or partially rolled ring is designated by the reference numeral 17. The ring blank 16 rests on a table 18, while the ring to be rolled 17 is arranged with increasing diameter on two spaced roller tables 19, 19 a. All or some of the roller tables 19, 19a may be motor driven, for example to remove the ring 17 in direction D after it has been finish rolled.

The upper cone roller opposite roller is designated by the reference numeral 20 and moves except in the XY direction all axes as the upper tapered roller 10th

Reference numeral 21 denotes a main roller cassette in which a shaft 22 is rotatably arranged in bearings on which a main roller 23 of the radial ring rolling mill 2 is rotatably arranged. The main roller cassette 21 is positioned in the radial stand.

25 with a rolling mandrel of Radialringwalzwerkes 2 is referred to, which is arranged substantially vertically and is arranged in an upper roller mandrel bearing 26 and a lower roller mandrel bearing 27 and through a central opening of the ring blank 16 (FIG. Fig. 5 ) passes through.

The upper roller mandrel bearing 26 and the lower roller mandrel bearing 27 each have a motor drive 28 or 29 assigned. These motor drives can also be designed as piston-cylinder units, which alternately on both sides via lines 30 and 31 fluid under pressure, preferably a hydraulic medium, are fed alternately controlled to the rolling mandrel 25 in the direction E or F, preferably in horizontal level, controlled to adjust and also lock in the desired position.

The upper roller mandrel bearing 26 is lowerable together with the carriage 24 and designed as, for example, cylinder motor drive 28. The lowering takes place parallel to the lower roller mandrel bearing 27 and the motor drive, for Example, the cylinder 29. With this option, it is possible to work with a shorter rolling mandrel 25 without additional moments are exerted by the displacement of the upper roll mandrel bearing on the machine and thus on the guides. This has the consequence that the rolling mandrel can be made correspondingly smaller. This is of great advantage when rolling superalloys.

The motor drive for the main roller cassette 21 is designated by the reference numeral 32. This motor drive 32 may also represent a piston-cylinder unit, which is supplied via a line 33, a fluid under pressure, also preferably a hydraulic medium, alternately controlled on both sides to the main roller cassette 21 in the vertical direction, ie in the direction O or P to adjust and also lock in the respective desired position within the radial roller carriage 24.

The reference numeral 34 designates a motor drive for the main roll 23. This drive can be designed, for example, as a radial piston drive or as a geared motor.

As can be seen from the drawing, the two roller tables 19 and 19a are arranged with gap spacing 35 to each other. In this gap distance 35 is a laser measuring device 36, which via a motor drive 37, in the present case also via a piston-cylinder unit, in direction G or H and optionally via the same motor or a separate motor in the direction L or M, thus orthogonal to the roller tables 19 and 19a, can be driven to the laser measuring device 36th if necessary, lower below the level of the roller tables 19, 19a, but they also in the direction G or H depending on the ring diameter or during rolling with the growth of the ring 17 can adjust. The conical shape and the outer profile of the ring 17 can be continuously measured by the laser measuring device 36 and the measured values forwarded to a central control and / or regulating device 38 and the position of the rolling mandrel bearings 26 and 27 corrected on the basis of the measured values. The lowering device for driving the laser device in the direction L and M and for locking thereof is designated by the reference numeral 39.

Reference numerals 40 to 47 designate drive groups with suitable fluid drive devices, for example hydraulic drive devices with valves, reservoirs for fluid, pumps, motors, which through the various lines shown carry all the motors, for example piston-cylinder units, and drives Drive energy, in particular with hydraulic pressure medium supply. In the control or regulating device 38 may be located in case of need, a suitable electronic memory in which are stored for the various rings, materials, profiles or the like suitable parameters, on the basis of which the various drives on the Control or regulating device 38 are controlled or controlled as part of a sequence control to produce rings 17 in the respectively desired manner.

The pumps and / or motors of the drive groups 40 to 47 may be adjustable, in particular adjustable, by the control and / or regulating device 38 in terms of their delivery rate. For this purpose, for example, hydrostatic pumps may come into consideration, which are control tube or control-controlled by a control valve to change the flow rate of the respective pump. But it is also possible to control the speed of pumps or to regulate to supply the respective motor drives accordingly with energy. The various drive groups 40 to 47 can also be associated with multi-way valves, not shown, for example, solenoid valves, which are also influenced by the control or regulating device 38 in order to influence the respective pressure medium in the various lines. The entire control or regulating device may be formed numerically (NC).

With the reference numerals 48 and 49 each have a centering arm associated, which is pivotable about a respective axis 50 and 51 in the direction K and N by a limited angular extent. The centering arms 48 and 49 are each actuated by a motor drive 52 and 53, respectively. These motor drives 52 and 53 may also be formed as a piston-cylinder units, the above Lines with a suitable pressurized fluid, in particular with a hydraulic medium alternately be acted upon on both sides.

Each of the centering arms 48, 49 is each associated with a centering roller 54 and 55, which is rotatably disposed on the respective centering arm 48 and 49 and scans the outer diameter of the ring to be rolled 17. The measured values are forwarded to the control or regulating device 38, wherein each centering arm 48 or 49 can be positioned by the motor drive 52 or 53. The rotational signals of the centering rollers 54 and 55 are forwarded in the form of control or regulating signals via the control and regulating device 38 to the corresponding motor drives of Axialringwalzwerkes 1 in order to influence its speed accordingly, for example, when the ring to be rolled in 17 its outer shape, for example, should deviate from its predetermined diameter tolerances, for example, assumes an oval shape, so that one or the other role of the outer diameter of the ring 17 would stand out. The control or regulation of the speed of the Axialringwalzwerkes 1 is then influenced so that the ring 17 retains its shape within predetermined tolerances or reached again.

If the finished rolled ring 17 is to be transported away in the direction D, the laser measuring device 36 is lowered and transported away by driving all or more of the roller tables 19 and 19a in the direction D.

As can be seen from the drawing, the longitudinal axes 11 of the Axialringwalzwerkes 1 on the one hand and 56 of the Radialringwalzwerkes 2 on the other hand an acute angle α to each other, which in the illustrated embodiment about 20 to 90 degrees, preferably about 30 to 70 degrees.

reference numeral

1

Axialringwalzwerk

2

Radial ring rolling mill

3

framework

4

guides

5

carriage

6

Infeed cylinder, motorized drive

7

management

8th

carriage

9

Rotary cylinder, rotary drive, motorized

10

Tapered roller, upper

11

Longitudinal central axis

12

Linearverstellzylinder, drive, motor

13

management

14

management

15

management

16

ring blank

17

ring

18

Table, rolling table

19

roller table

19a

roller table

0

roller

21

Main roll cassette

22

wave

23

main roll

24

Radial roller carriage

25

rolling mandrel

26

Rolling mandrel bearing, upper

27

Rolling mandrel bearing, lower one

28

Drive, motor

29

Drive, motor

0

management

31

management

2

Drive, motor, piston-cylinder unit

33

management

34

Drive, motor, piston-cylinder unit

35

gap distance

36

Laser measuring device

37

Drive, motor, piston-cylinder unit

38

Control / regulating device

39

lowering

40

drive group

41

drive group

42

drive group

43

drive group

44

drive group

45

drive group

46

drive group

47

drive group

48

centering

49

centering

50

axis

51

axis

52

Drive, motor, piston-cylinder unit, centering arm 48

53

Drive, motor, piston-cylinder unit, centering arm 49

54

flipper

55

flipper

56

Longitudinal axis of the radial ring rolling mill 2

α

Angle between the longitudinal axes of the radial and Axialringwalzwerkes

A

Lifting direction of the carriage 5 in the axial direction of the tapered roller 10th

B

Lifting direction of the carriage 5 in the axial direction of the tapered roller 10th

D

Abtransportrichtung of the ring 17

e

Lifting direction of the rolling mandrel bearing 26

F

Lifting direction of the rolling mandrel bearing 26

G

Lifting direction of the motor drive 37 for laser measuring devices 36

H

Lifting direction of the motor drive 37 for laser measuring devices 36

K

Pivoting direction of the centering arm 48, 49

L

Lifting direction of the laser measuring device 36 orthogonal to the roller tables 19, 19a

M

Lifting direction of the laser measuring device 36 orthogonal to the roller tables 19, 19a

N

Pivoting direction of the centering arm 48, 49

O

Lifting direction of the main roller cassette 21

P

Lifting direction of the main roller cassette 21

T

stroke direction

V

stroke direction

X

Lifting direction of the carriage 5 of the Axialringwalzwerkes. 1

Y

Lifting direction of the carriage 5 of the Axialringwalzwerkes. 1

bibliography

• DE 10 19 635 B
• DE 960 264
• DE 17 52 887 A1
• DE 22 22 607 A1
• DE 29 17 369 A1
• DE 29 23 001 A1
• DE 326 925
• DE 305 929
• FR 1 009 653
• US 2,268,330

Claims (16)

1. Motor-driven axial-radial ring rolling mill (1, 2) with control and/or regulating devices for controlling the rolling operations, where the axial ring rolling mill (1) is arranged directly adjacent to the radial ring rolling mill (2) in such a way that the machine stand of the radial ring rolling mill (2) and therefore the longitudinal axis (56) of the radial ring rolling mill (2), are arranged at an acute angle (α) to the axial ring rolling mill (1) and therefore to the longitudinal axis (11) of the axial ring rolling mill (1).
2. Axial-radial ring rolling mill according to claim 1 characterised in that the linear motion (A or B) of the axial stand (3) with the tapered rollers (10) is between 0 and 2000 millimetres or, preferably, between 0 and 1000 mm.
3. Axial-radial ring rolling mill according to claim 1 or claim 2, characterised in that the device has a rolling table (18) to receive the ring blank (16).
4. Axial-radial ring rolling mill according to claim 1 or either of the subsequent claims, characterised in that a conveying device (19, 19a) e.g. a roller table, a walking beam conveyor or other means of continuous transport is assigned to the rolling mills (1, 2), where the conveying device (19, 19a) serves to load and unload the ring (17) before and after rolling.
5. Axial-radial ring rolling mill according to claim 4 characterised in that all or some of the rollers of the roller table (19, 19a) are motor-driven.
6. Axial-radial ring rolling mill according to claim 1 or any of the claims 2 to 5, characterised in that the main roll is vertically adjustable by motor and lockable in the desired position and is formed and arranged in such a way that rolling can be carried out at varying passes.
7. Axial-radial ring rolling mill according to claim 1 or any of the claims 2 to 6, characterised in that the radial ring rolling mill (2) and/or the axial ring rolling mill (1) can be driven by directly driving radial-piston motors or geared motors.
8. Axial-radial ring rolling mill according to claim 1 or any of the subsequent claims, characterised in that two roller tables (19, 19a) arranged at a distance from one another are assigned to the axial-radial ring rolling mill (1, 2), of which all or some of the rollers are motor-driven.
9. Axial-radial ring rolling mill according to claim 8, characterised in that a laser measuring device (36) is arranged between the two roller tables (19, 19a).
10. Axial-radial ring rolling mill according to claim 9, characterised in that the laser measuring device (36) is formed in such a way that it can be adjusted to and locked in two planes preferably arranged at right angles to one another, in particular in the vertical and horizontal planes.
11. Axial-radial ring rolling mill according to claim 10, characterised in that the motorised drive system of the laser measuring device (36) is a piston-cylinder unit which can be pressurised, preferably by hydraulic pressure, alternately on either side.
12. Axial-radial ring rolling mill according to claim 9 or claim 10, characterised in that the laser measuring device (36) can be lowered by motor below the level of the roller table (19, 19a).
13. Axial-radial ring rolling mill according to claim 8 or any of the subsequent claims, characterised in that the laser measuring device (36) is formed in such a way that it measures the outer and inner diameter and the ovality of the ring (17) and transmits the readings online to the control and regulating device (38).
14. Axial-radial ring rolling mill according to claim 13, characterised in that the laser measuring device (36) is formed in such a way that it measures the conicity and the outer profile of the rings (17) and that the readings can be transmitted to the control and regulating device (38) and that the position of the expanding mandrel bearing (26, 27) can be adjusted according to the readings.
15. Axial-radial ring rolling mill according to claim 1 or any of the claims 2 to 14, characterised in that a motor-adjustable centring device with a centring arm (48, 49) and a centring roll (54, 55) is arranged on at least one side, preferably on each of the opposing sides in the area of the radial ring rolling mill (2) and the axial ring rolling mill (1), which is suitable for touching, guiding or scanning the outer periphery of the ring (17) being rolled, where the centring arm (48, 49) can be positioned by motor power, e.g. by a piston-cylinder unit (52, 53) pressurised alternately by a pressure medium, preferably hydraulic, on either side, where the rotation signals produced by each of the centring rolls (54, 55) can be transmitted to the control and/or regulating device (38) of the motor drive units e.g. of the radial ring rolling mill (2) and/or the axial ring rolling mill (1), and regulate or control the speed.
16. Process for operating an axial-radial ring rolling mill according to claim 1 or any of the claims 2 to 15, characterised in that the control and regulating device (38) always causes the axis of rotation of the axial ring rolling mill (1) and the axis of the tapered rollers to point to the centre of the growing ring (17), where, as the diameter of the ring increases, the axial rolling stand moves linearly towards the centre of the ring until the rolled ring (17) is located at the rearmost position of the tapered rollers (10).

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