EP3523062B1 - Roll ring arrangement having a roll ring and a roll shaft - Google Patents

Description

The invention relates to a roller ring arrangement with a roller ring and a roller shaft, on which the roller ring is arranged in a rotationally fixed manner and which has a thread area which, viewed towards the free end of the roller shaft, is located axially next to the roller ring, a nut screwed onto the threaded area exerting axial tension exerts on the rolling ring. A generic roller ring arrangement is from DE-A 40 41 957 known.

From the U.S. 4,650,364 a roller ring arrangement is known in which a roller ring is braced on the roller shaft using a conical sleeve and is essentially fixed by radial tension. The radial tension is selected to be sufficiently high for the transmission of the torque required for a rolling process between the roller shaft and the roller ring. In such roll ring arrangements, the roll ring is subjected to relatively high tensile loads. Modern rolling rings can withstand high compressive forces, but are not very strong. B. for roller rings made of hard metal.

To generate this tension, the conical sleeve is pushed between the shaft journal and the roller ring using a hydraulic tensioning tool with high pressure. This creates a non-positive connection. Due to the high pre-tensioning force on the conical sleeve, considerable tensile stresses arise in the rolling ring. These tensile stresses can lead to the bursting of the roll rings and promote the formation of cracks in the groove base. The crack formation leads to more frequent reworking of the roll rings and thus to an increased exchange of the roll rings. These increased reworking cycles as well as the downtime of the entire system during the roll ring change cause additional production costs. In order to keep the tensile stresses and the formation of cracks low, wider roller rings are used, which increases tool costs.

Another solution therefore provides for an axial tensioning of the rolling rings, as shown in FIG DE 103 02 660 B4 known. The high axial working tension of this roller ring arrangement required for a tensioning process is applied by a nut screwed onto the threaded area and / or by a hydraulically operating, axial tensioning device. The nut can be rotated or actuated independently of the hydraulic tensioning device and the hydraulic tensioning device can be used independently of the nut. The hydraulic clamping device is intended to carry out the clamping process as well as the release process. The nut is intended to maintain the working tension achieved by hydraulic means. This makes it possible to remove the hydraulic tensioning device from the shaft as soon as the axial working tension is transmitted through the nut. However, an additional hydraulic tensioning device is always required to axially tension the roller ring.

Furthermore, a roller ring arrangement is known from operational practice, in which the axial working tension is applied to the roller ring by means of a tie rod which is screwed into the roller shaft, whereby the roller shaft is considerably weakened in cross section. In addition to high rolling torques, high piercing impacts occur during rolling. These piercing joints result from the cooling at the beginning of the bar and also exert a moment force on the roller ring. This moment force is passed on to the tie rod via a tensioning nut that engages the roller ring and is arranged on the roller shaft, which can lead to overstressing of the tie rod. This additional load causes the tie rod to break. The consequence of this is reworking of the roller shaft or rejects.

The invention is therefore based on the object of creating a generic roller ring arrangement without the aforementioned disadvantages, in which the roller ring can also be axially clamped on the roller shaft in a rotationally fixed manner without the use of an additional hydraulic tensioning device. According to the invention, this object is achieved by a sleeve-like clamping element which is arranged between the roller ring and the threaded area and which is designed with a front collar facing the threaded area and a rear collar, with the rear collar on the one hand resting against the roller ring with frictional engagement and on the other hand being in the Middle section formed between the two collars toothed shaft profile of the clamping element is positively arranged on a toothed shaft profile of the roller shaft, the sleeve-like clamping element being acted upon against the roller ring by the clamping nut screwed onto the threaded area. The required working tension is exerted on the clamping element via the clamping nut screwed mechanically onto the threaded area. As a result, the tensioning element is pressed against the roller ring with the end face of its rear collar, so that a frictional connection is created between tensioning element and roller ring.

Furthermore, the center part of the tensioning element is designed with a splined shaft profile on the inside and the roller shaft with a splined shaft profile on the outside. A positive and self-centering connection between the roller shaft and the tensioning element is thus achieved, the connection preferably corresponding to a polygonal profile, so that a roller shaft-tensioning element connection for high torques can be achieved overall. The core of the roller shaft is not weakened, and the reduced tensile stress means that roller rings made of ceramic materials and with a narrower design can be used.

The form-fit connection between the tensioning element and the roller shaft enables the resulting roll joints to be absorbed by the form fit during the rolling operation. The inventive combination of frictional engagement between the tensioning element and the roller ring as well as from A form fit between the clamping element and the roller shaft is used to transfer the high rolling torque.

Furthermore, it is provided according to the invention that the clamping nut for clamping force transmission in the sleeve-like clamping element is arranged concentrically on the roller shaft in a receiving section an intermediate ring enclosed by the front collar and a spring means in a radial and axial free space of the receiving section delimited by the intermediate ring and the central section of the clamping element, preferably consisting of at least two disc springs are assigned. On the one hand, the pretensioning force required for the tensioning system is introduced by the spring means in a structurally simple and cost-effective manner and, on the other hand, the loading initiated via the tensioning nut and the intermediate ring is transmitted to the tensioning element by the spring means.

A further embodiment of the invention provides that a conical sleeve or similar fitting and sliding spring means is arranged between the roller ring and the roller shaft, which can be axially acted upon by an end face of the tensioning element set back relative to the rear collar. In this case, the conical sleeve is pushed in between the roller shaft and the roller ring with moderate pressure at the same time as the axial pressure is applied to the roller ring by the intermediate ring, the disc springs and the tensioning element, whereby the frictional connection between the tensioning element and roller ring is supported by a non-positive connection between the roller ring and roller shaft can be.

It is also preferred that a positive connection between the tensioning element and the roller ring is obtained by introducing a friction layer on their contact surface. The coefficient of friction of this friction layer is preferably set between 0.9 and 1.0, particularly preferably 1.0. This enables the necessary torque via the interface between the To transfer the clamping element and the roller ring from the roller shaft to the roller ring and thereby also enable the conical sleeve to retain only a centering function, but not a function of torque transmission. This also enables the conical sleeve to be designed to be lighter overall, for example using a light metallic or non-metallic material such as aluminum or plastic, which can advantageously reduce the weight of the high-speed roller shafts in question and improve the overall balance quality. The axial bracing achieved in this way means that roller rings made of hard metal or ceramic can also be used. Due to their sensitivity to tensile and compressive stress, these could not previously be used in such applications.

Further features and details emerge from the claims and the following description of an exemplary embodiment of the invention shown in the drawings.

Fig. 1

eine axiale Schnittdarstellung einer Walzringanordnung, umfassend eine Walzenwelle, einen Walzring, ein Spannelement, Federmittel, einen Zwischenring und eine Spannmutter;

Fig. 2

als Einzelheit die Walzenwelle in einer perspektivischen Darstellung;

Fig. 3

als Einzelheit das Spannelement in einer perspektivischen Darstellung; und

Fig. 4

eine axiale Schnittdarstellung einer Walzringanordnung ähnlich der Ausführungsform gemäß Figur 1.

Show it:

Fig. 1

an axial sectional view of a roller ring arrangement, comprising a roller shaft, a roller ring, a tensioning element, spring means, an intermediate ring and a tensioning nut;

Fig. 2

as a detail, the roller shaft in a perspective view;

Fig. 3

as a detail, the clamping element in a perspective view; and

Fig. 4

an axial sectional view of a rolling ring assembly similar to the embodiment according to Figure 1 .

The Figure 1 shows a roller ring arrangement with a roller ring 1 which has grooves in the exemplary embodiment shown here. It is used for the production of long material, e.g. B. bar steel or wire designed. The arrangement also has a roller shaft 2, which has a collar in the right area, on which the roller ring 2 is supported with the interposition of sealing slide rings 3.

Starting from the sliding rings 3 and looking towards the left, free end, the roller shaft 2 initially has a conical shaft section 4 for the roller ring 1, a centering area 6 having a splined shaft profile 5 for a clamping element 8 having a complementary splined shaft profile 7 in its middle part for a positive connection , an adjoining receiving section 9 for an intermediate ring 10 and a subsequent threaded region 11 which engages with the thread of a clamping nut 12.

The tensioning element 8 is designed in the manner of a sleeve, a front collar 13 of enlarged diameter enclosing the intermediate ring 10 arranged concentrically on the roller shaft 2. Two disc springs 15 are arranged in a radial and axial free space 14 of the receiving portion 9 that is delimited by the intermediate ring 10 and the central portion of the tensioning element 8.

At its end 16 facing the roller ring 1, the tensioning element 8 is designed with a rear collar 17, with a conical sleeve 18 reaching under the collar 17 on the conical shaft section 4 of the roller shaft 2, which is arranged from an end face that is set back from the end face of the rear collar 17 19 of the clamping element 8 can be acted upon and engages in a radial gap 20 between the roller ring 1 and the roller shaft 2.

By screwing and tightening the clamping nut 12 on the threaded area 11, an axial working tension is applied to the intermediate ring 10 and exerted on the tensioning element 8 via the pre-tensioned disc springs 15, whereby the rear collar 17 is tensioned against the roller ring 1 in a frictionally engaged manner.

A form-fitting connection is achieved between the clamping element 8 and the roller shaft 2 by the splined shaft profiles 5 and 7, while the axial working tension transmitted by the clamping element 8 to the roller ring 1 creates a frictional connection between the tensioning element 8 and the roller ring 1. The combination of form fit and friction fit is used to transmit high rolling torques and to absorb the rolling force.

In addition, an axial force is exerted on the conical sleeve 18 via the end face 19 of the clamping element 8, the conical sleeve 18 being pushed into the radial gap 20 between roller ring 1 and roller shaft 2 with moderate pressure, so that a non-positive connection between roller ring 1 and roller shaft 2 is created.

After the clamping process has been completed, the threaded area 11 with the clamping nut 12 is protected against the ingress of dirt and foreign bodies by a protective cap 21. The entire roll ring arrangement is freely accessible from the front for assembly purposes and enables shorter changing times when changing the roll ring.

Figure 4 FIG. 11 shows an axial sectional view of a roller ring arrangement similar to that in FIG Figure 1 shown rolling ring arrangement, the difference between the embodiment according to Figure 1 and the embodiment according to Figure 4 Essentially, a friction layer 22, preferably with a coefficient of friction μ ₀ of approximately 1.0, is attached to the contact surface between the rear collar 17 of the tensioning element 8 and the roller ring 1, via which the necessary torque is applied almost positively via the interface can be transmitted between the roller ring 1, the clamping element 8 and the roller shaft 2. Through this positive torque transmission, there is the remaining function of the conical sleeve 18 in its centering function, a torque is no longer transmitted by the conical sleeve 18. In the embodiment shown, the conical sleeve 18 is made of a non-metallic material, for example a plastic. The unit of the tensioning element 8, comprising the plate spring 15 and the intermediate ring 10, is pushed on in a relaxed manner against the roller ring 1, which is pre-centered by the conical sleeve 18. The pre-tensioning then takes place with a commercially available hydraulic tensioning tool to the necessary contact force between the tensioning element 8 and the roller ring 1 As a result, the force transmission surface lies on a maximum possible mean diameter between the inner and outer diameter of the roller ring 1.

List of reference symbols

1

Roll ring

2

Roller shaft

3

Slip ring

4th

conical shaft section

5

Splined shaft profile

6th

Centering area

7th

Splined shaft profile

8th

Clamping element

9

Receiving section

10

Intermediate ring

11

Thread area

12

Clamping nut

13

front collar

14th

free space

15th

Disc spring

16

free end

17th

back collar

18th

Conical sleeve

19th

Face

20th

radial gap

21st

protective cap

22nd

Friction layer

Claims (3)

1. Roll ring arrangement with a roll ring (1) and a roll shaft (2), on which the roll ring (1) is arranged to be secure against relative rotation and has a threaded region (11) which as seen towards the free end of the roll shaft is disposed axially adjacent to the roll ring (1), wherein a nut (12) screwed onto the threaded region (11) exerts an axial stress on the roll ring (1),
   wherein
   arranged between the roll ring (1) and the threaded region (11) is a sleeve-like clamping element (8), which is formed with a front collar (13) facing the threaded region (11) and a rear collar (17), wherein on the one hand the rear collar (17) bears against the roll ring (1) with a friction couple and on the other hand a splined shaft profile (7), which is formed in the middle section between the two collars (13, 17), of the clamping element (16) is arranged in mechanically coupled manner on a splined shaft profile (5) of the roll shaft (2), wherein the sleeve-like clamping element (8) can be loaded by the clamping nut (12), which is screwed onto the threaded region (11), towards the roll ring (1),
   characterised in that
   an intermediate ring (10), which in the sleeve-like clamping element (8) is arranged concentrically on the roll shaft (2) in a receiving section (9) and which is surrounded by the front collar (13), and a spring means, preferably consisting of at least two plate springs (15), in a free space (14), which is radially and axially bounded by the intermediate ring (10) and the middle section of the clamping element (8), of the receiving section (9) are associated with the clamping nut (12) for clamping force transmission.
2. Roll ring arrangement according to claim 1,
   characterised in that
   a conical sleeve (18) is arranged between the roll ring (1) and the roll shaft (2) and can be axially loaded by a end surface (19), which is offset rearwardly relative to the rear collar (17), of the clamping element (8).
3. Roll ring arrangement according to claim 1 or 2,
   characterised in that
   the roll ring (1) is clamped only axially with the roll shaft (2) and the roll ring (1) consists of hard metal or ceramic.

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