Rolling mill device for transmitting large torques

Abstract

The invention relates to a rolling mill system (1) comprising two universal joint shafts (4, 5) which are each connected to a drive (13, 14), a first roll-side joint (6) having a first distance (10) to a first working roll (2) and a second roll-side joint (7) having a second distance (11) to a second working roll (3), the first and second distances (10, 11) differing from 0.5 m to 4 m, a length changing device (12) is arranged between the roller-side joints (6, 7) and the working rollers (2, 3) in at least one universal joint shaft (4, 5).

Description

[0001] The invention relates to a rolling mill device, which comprises a first working roll and a second working roll, wherein the two working rolls are respectively connected to a universal joint shaft, and the universal joint shaft is respectively connected to a driving device, wherein the two universal joint shafts respectively comprise a roll side joint and a driving side joint.

[0002] The document EP 3227578 B1 known from the prior art describes a cardan shaft whose length can be varied telescopically. The use in a roller stand with two cardan shafts and corresponding protective measures for operating the cardan shafts arranged next to each other is not described.

[0003] Furthermore, the document JP 2013 136070 known from the prior art describes two cardan shafts arranged in parallel, each of which comprises a length change device, wherein the length change devices are likewise arranged parallel to one another.

[0004] In addition, document DE 10316261 known in the prior art also shows two cardan shafts with journals for changing length. Here, the length changing devices are also arranged parallel to each other.

[0005] In the prior art arrangement of roll-side joints arranged one above the other, the roll-side joints can at most have the same diameter as the working rolls, since the upper and lower rolls in thin-plate rolling mills and during calibration have only a minimal or even no roll gap. Due to this limitation, the roll-side joints have the greatest risk of failure. In the prior art, corresponding shaft elements, so-called "spacers", are used in the offset arrangement of the joints to create space for the joints, which results in the overall lengthening of the rolling mill.

[0006] The technical problem to be solved by the present invention is to provide a particularly compact rolling mill with improved torque bearing capacity in order to be able to transmit large torques from the drive to the working rolls. The cardan shaft usually has the greatest risk of failure at the roll side joints, so the present invention is to provide a rolling mill that allows the installation of roll side joints with greater torque bearing capacity.

[0007] This object is achieved according to the invention by the embodiments corresponding to the independent claims. Further advantageous embodiments of the invention can be found in the dependent claims.

[0008] The technical problem is solved according to the invention by a rolling mill installation, wherein the first roll-side joint has a first spacing to the first working roll and the second roll-side joint has a second spacing to the second working roll, wherein the first spacing and the second spacing differ by 0.5 m to 4 m, and wherein a length changing device is arranged in at least one cardan shaft between the roll-side joint and the working roll, and a further length changing device is arranged in the other cardan shaft between the roll-side joint and the drive-side joint.

[0009] The different distances can advantageously allow the joints to be arranged side by side. The joints of a cardan shaft require a larger design than shafts and / or length change devices to transmit the same torque without exceeding their load limits. In the prior art, the joints are arranged in parallel, so that the joint diameter cannot be larger than the roller diameter, otherwise the two roller-side joints would collide.

[0010] By using shafts or length change devices with a smaller diameter than the working rolls, space can be created for the arrangement of larger roll-side joints. The use of length change devices is important in cardan shafts in order to compensate for changes in the roll position without transmitting these changes as binding forces to the drive. Changes in length in the working rolls of the roll stand can be caused by thermal expansion. In addition, the working rolls can also be actively displaced along the axis of rotation, in particular in order to compensate for tilted positions and thickness differences in the width of the rolled stock during the rolling process.

[0011] The length-changing device can hereby change the length telescopically along the axis in the loaded or unloaded state. The length-changing device is also known as telescopic function, telescopic axis or length compensation.

[0012] Furthermore, a rolling mill installation is advantageous if the length changing device on the lower cardan shaft is arranged between the lower roll-side articulation and the lower working roll.

[0013] Due to the length of the length-changing device, its own weight, the weight of the cardan shaft and / or the weight of the roll-side joint, bending moments and the resulting material loads are generated, in particular on the connecting sleeve, where the length-changing device is arranged outside the two joints and between the working roll and the roll-side joint. The bending occurs in the direction of gravity.

[0014] Such a bending can have a negative effect on the material stresses of the connection between the roll-side joint and the working roll and / or the length-changing device.Another advantageous effect of the arrangement on the lower shaft is better accessibility and the possibility of installing a supporting device for support.

[0015] Furthermore, a rolling mill installation is advantageous if the length changing device is supported by means of a supporting device.

[0016] The support device can advantageously compensate for the bending. The support device advantageously comprises rollers pressing against the surface of the length-changing device, wherein the pressing force is selected such that the bending is at least largely compensated. The support device can also comprise a plurality of rollers which jointly perform the supporting function and, if necessary, can also guide the length-changing device laterally or completely circumferentially on the axis of rotation. In addition, a plurality of support rollers can also be arranged axially one behind the other in order to evenly increase the supporting function. The support device is advantageously designed as a support shaft and advantageously comprises at least one roller bearing in order to absorb the introduced supporting forces. The rollers of the support shaft are advantageously smaller than the pressure rollers of the rolling mill, typically with a diameter of 10% to 40% of the pressure rollers.

[0017] It is also advantageous for a rolling mill to comprise a further length-changing device, wherein the further length-changing device is arranged between two joints of a cardan shaft which has no length-changing device between the roll-side joint and the working rolls.

[0018] Known in the prior art, usually in rolling mills, both cardan shafts have a device for length compensation. However, in contrast to the prior art, only one length-changing device is arranged between the joints of the cardan shafts.

[0019] Furthermore, a rolling mill installation is advantageous if the diameter of at least one of the roll-side joints is 3% to 30% larger than the diameter of the connected working rolls.

[0020] The diameter of a joint is the largest dimension of the joint perpendicular to at least one axis of rotation, i.e. the enveloping circle. In the case of a universal joint shaft, the diameter can theoretically be increased by deflecting the universal joint shaft, since the deflection causes a part of the joint to rotate along a different axis of rotation and thus takes up more space in one direction. However, in order to avoid this, the joint fork is usually rounded around the center of rotation of the joint and shaped accordingly.

[0021] The roll gap is an imaginary line in the extension as a so-called pass line, which characterizes the support surface of the region through which the rolled stock passes when passing through the rolling mill. In an advantageous embodiment of the invention, at least one roll-side joint, preferably a lower roll-side joint, can protrude beyond the pass line.

[0022] Furthermore, it is advantageous for a rolling mill installation if the diameter (D G ) is designed in the range of 40 cm to 150 cm, wherein the universal joint shaft is suitable for transmitting a torque of 200 knm to 15000 knm.

[0023] Larger joints make it possible to provide rolling mills with cardan shafts with greater torque-carrying capacity. However, the design complexity and larger joints only make economic sense when the rolling mill has to transmit high torques. This is especially true for rolling mills for metal processing and / or sheet metal production. Therefore, use with torques of 400-15,000 kNm and diameters in the range of 50-130 cm is particularly advantageous.

[0024] Furthermore, a rolling mill installation is advantageous if the two cardan shafts are each supported by means of at least one supporting device.

[0025] The use of at least one support shaft can reduce bending or at least reduce the bending moments on the connecting sleeve. It is also advantageous to arrange a plurality of support shafts on the cardan shaft, so that the connecting sleeves and cardan bearings of all cardan shafts can be relieved of the high weight forces and the resulting bending moments.

[0026] Furthermore, a rolling mill is advantageous in which the length changing device has an inner shaft body and an outer sleeve, wherein the shaft body has a toothing and the sleeve has a matching toothing.

[0027] The length change device should be designed so that the friction of the telescopic length change can be as low as possible, wherein at the same time must ensure the effective transmission of high torques. It is also advantageous that the length change must allow only a small amount of play, in which respect a toothing parallel to the axis of rotation has proven to be particularly advantageous.

[0028] Furthermore, it is advantageous for a rolling mill installation that the cardan shaft comprises a cross joint. Furthermore, it is advantageous for a rolling mill installation that the cardan shaft comprises a flat pin joint or a toothed joint.

[0029] According to the embodiment of the present invention, the cardan shaft is advantageously designed as a cross joint, a flat pin joint or a toothed coupling joint. Other types of cardan shafts cannot withstand the stress of a rolling mill for metal processing.

[0030] The present invention is described below with reference to the accompanying drawings. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of the prior art is shown;

[0032] Figure 2 A schematic diagram is shown with various aspects according to the present invention.

[0033] Figure 1A schematic diagram, not to scale, of a rolling mill 1 according to the prior art is shown. The rolling mill comprises a first working roll 2 and a second working roll 3, which are suitable for rolling a rolled product, in particular a metal part, in a roll gap. The roll gap is shown in the extended part as a dashed line of a so-called through line 21. The working rolls 2, 3 are connected to a first drive 13 and a second drive 14 by means of a first cardan shaft 4 and a second cardan shaft 5, respectively. The cardan shafts here each comprise a roll-side joint 6, 7, a length-changing device 12 and a drive-side joint 8, 9. In this case, in both cardan shafts 4, 5, the length-changing device 12 is arranged between the roll-side joint 6, 7 and the drive-side joint 8, 9. No part of the cardan shafts 4, 5 may protrude beyond the through line, otherwise the cardan shafts may collide. The diameter of all joints is smaller than the diameter of the working rolls 2, 3.

[0034] Figure 2 A schematic diagram, not to scale, of a rolling mill 1 having features according to the invention is shown. The rolling mill comprises a first working roll 2 and a second working roll 3, which are suitable for rolling a rolled product, in particular a metal part, in a roll gap. The roll gap is shown in the extended part as a dashed line, a so-called through line 21. The working rolls 2, 3 are connected to a first drive 13 and a second drive 14 by means of a first cardan shaft 4 and a second cardan shaft 5. The cardan shafts here each comprise a roll-side joint 6, 7, a length-changing device 12 and a drive-side joint 8, 9. In the first cardan shaft 4, the first roll-side joint 6 is connected to the first working roll 2 at a first spacing 10. The second working roll 3 is first connected to the length-changing device 12 and then to the second roll-side joint 7. Alternatively, the rolling mill 1 is arranged relative to the weight g as shown in the figure, wherein the second cardan shaft 5 is then the lower cardan shaft 16. Similarly, the second roll-side joint 7 is then the lower roll-side joint 17 and the second working roll 3 is the lower working roll 18. The length changing device arranged between the second working roll 3, 18 and the roll side joint 7, 17 is Figure 2 The support device 15 is supported in the middle by means of a support device 15. The support device 15 is shown here only as an active support roller, but can also include at least one bearing, in particular by means of a roller bearing and a retaining element, in particular an adjustable retaining element. The support device can also include a plurality of support rollers or support shafts not shown in the figure, wherein the rotation axis of the support device 15 extends parallel to the rotation axis of the working roll or the rotation axis of the supported length change device 12. The second spacing 11 is shown as the distance between the second or lower working roll 3, 18 and the roll side joint or lower joint 7, 17. Sufficient space is left by the offset arrangement of the two roll side joints 6, 7 so that the roll side joints 6, 7 can protrude beyond the through line 21 without colliding with the corresponding other universal joint shaft.

[0035] Reference numerals list

[0036] 1 Rolling mill equipment

[0037] 2 First working roll

[0038] 3 Second working roll

[0039] 4 First cardan shaft

[0040] 5 Second cardan shaft

[0041] 6 First roller side joint

[0042] 7 Second roller side joint

[0043] 8 First drive side joint

[0044] 9 Second drive side joint

[0045] 10 First spacing

[0046] 11 Second spacing

[0047] 12 Length changing device

[0048] 13. First drive unit

[0049] 14 Second drive unit

[0050] 15 Support device

[0051] 16 Lower universal joint shaft

[0052] 17 Lower roller side joint

[0053] 18 Lower working roll

[0054] 19 Axis

[0055] 20 Sleeve

[0056] 21 through line

[0057] g Gravity

[0058] D G Joint diameter

[0059] D w Roller diameter

Claims

1. A rolling mill device (1), comprising a first working roll (2) and a second working roll (3), wherein: The two working rolls (2, 3) are respectively connected to a cardan shaft (4, 5), which is respectively connected to a drive device (13, 14), wherein the two cardan shafts (4, 5) respectively include a roll-side joint (6, 7) and a drive-side joint (8, 9), characterized in that the first roll-side joint (6) has a first spacing (10) to the first working roll (2), and the second roll-side joint (7) has a second spacing (11) to the second working roll (3), wherein the first spacing and the second spacing (10, 11) differ by 0.5 m to 4 m, and wherein in at least one of the cardan shafts (4, 5) a length changing device (12) is arranged between the roll-side joint (6, 7) and the working roll (2, 3), and in the other cardan shaft (4, 5) a further length changing device (12) is arranged between the roll-side joint (6, 7) and the drive-side joint (8, 9).

2. The rolling mill equipment (1) according to claim 1, characterized in that The length changing device (12) is arranged on the lower cardan shaft (16) between the lower roll-side joint (17) and the lower working roll (18).

3. The rolling mill equipment (1) according to claim 1 or 2, characterized in that: At least one length changing device (12) is supported by means of a supporting device (15).

4. A rolling mill (1) according to any one of the preceding claims, characterized in that The rolling mill (1) comprises a further length changing device (12), wherein the further length changing device (12) is arranged between two joints (6, 8 or 7, 9) of a universal joint shaft (4, 5) which has no length changing device (12) between the roll-side joints (6, 7) and the working rolls (2, 3).

5. A rolling mill (1) according to any one of the preceding claims, characterized in that The diameter (D G ) is smaller than the diameter (D W ) is 3% to 30% larger.

6. A rolling mill (1) according to any one of the preceding claims, characterized in that The diameter of the roller side joint (D G ) is designed in the range of 40 cm to 150 cm, wherein the cardan shaft (4, 5) is suitable for transmitting a torque of 200 knm to 15000 knm.

7. A rolling mill (1) according to any one of the preceding claims, characterized in that The two cardan shafts (4, 5) are each supported by means of at least one supporting device (15).

8. A rolling mill (1) according to any one of the preceding claims, characterized in that The length changing device (11) has an inner shaft body (19) and an outer sleeve (20), wherein the shaft body (19) has a toothing and the sleeve (20) has a matching toothing.

9. A rolling mill (1) according to any one of the preceding claims, characterized in that The universal joint shafts (4, 5) comprise cross joints.

10. A rolling mill (1) according to any one of the preceding claims, characterized in that The universal joint shafts (4, 5) include planar pin joints or toothed connection joints.

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