EP2654980A1

EP2654980A1 - Bearing arrangement and rolling unit for a rolling-mill roll

Info

Publication number: EP2654980A1
Application number: EP11799095.2A
Authority: EP
Inventors: Karl Keller
Original assignee: SMS Siemag AG
Current assignee: SMS Siemag AG
Priority date: 2010-12-23
Filing date: 2011-12-19
Publication date: 2013-10-30
Also published as: WO2012084791A1; DE102010064102A1; US20130324384A1; DE102010064102B4; US8690743B2

Abstract

The invention relates to a bearing arrangement and a rolling unit for a rolling-mill roll. The bearing arrangement comprises a bearing housing, a bearing bush (120) rigidly installed in the bearing housing, a journal bush (130) rotatably supported in the bearing bush, a bearing device (140) for the roll journal, and a pressure shoulder ring arranged between the journal bush (130) and the bearing device (140). At least one feather key (150) is used to connect both the journal bush and the pressure shoulder ring (135) to the roll journal of the rolling-mill roll in a rotationally rigid manner. In order to further develop such a known bearing arrangement for a rolling-mill roll and a known rolling unit so that it is easier to remove the bearing arrangement from the roll journal, the bearing arrangement according to the invention has a coupling device between the journal bush (130) and the pressure shoulder ring (135) without or with only low stress.

Description

Bearing arrangement and rolling unit for a rolling mill roll

The invention relates to a bearing arrangement for a rolling mill roll and a roller unit.

Bearing arrangements for a rolling mill roll are basically known in the prior art. They typically comprise a bearing housing, a bearing bushing fixedly mounted in the bearing housing, a journal bush rotatably mounted in the bearing bush, a bearing device for the roll neck of the mill roller and a pressure shoulder ring arranged between the journal bushing and the bearing device. At least the pin bushing is typically connected to the roll neck in a rotationally secure manner via a feather key. Finally, the typical bearing assembly comprises a screwed onto a shoulder of the roll neck nut for securing the bearing assembly against axial displacement.

Such a bearing arrangement is z. B. from German patent application DE 26 12 744 or EP 1 871 549 A1. In the arrangement there, either only the pin bushing or only the pressure shoulder ring is connected to the roll neck in a manner secured against rotation by means of a feather key. An anti-rotation of either the pressure shoulder ring or the pin bushing, if they are not connected via the feather key with the roll neck, takes place according to the local disclosure by a screw connection between the pressure shoulder ring and the pin bushing. The screw for the realization of the screw must be tightened in this case with such a large torque that between the pressure shoulder ring and the front side of the pin bush a frictional connection and such a large tension between the pressure shoulder ring and the pin bushing arises that between the pin bushing and the pressure shoulder ring no relative movement is possible.

Disadvantageously, the screw or the screws are subjected to a very high load in this arrangement as soon as the union of pin bushing with screwed-on pressure shoulder ring axially moves away from the cone during one revolution of the roller under the radial bearing load. This axial load stresses the screw on bending, because the journal bush not only moves axially, but also constricts radially at the same time. In order to avoid these loads on the screw connection, the bearing arrangement known from WO 2007/134655 A2 provides a feather key which simultaneously connects both the pin bushing and the pressure shoulder ring to the roll neck in a manner secure against rotation. A screw connection between the pressure shoulder ring and the journal bushing is no longer necessary in this arrangement, at least to prevent a relative movement or rotation between the pressure shoulder ring and roll neck due to the provided feather key arrangement.

Based on this prior art, the present invention seeks to further develop a known bearing assembly and roller unit for a rolling mill roller to the effect that the dismantling of the pin bushing is simplified by the roll neck of the rolling mill roll.

This object is achieved with respect to the bearing assembly by the subject matter of claim 1. This is characterized in that at least one coupling device is provided for coupling the pin bushing without or with only slight tension on the pressure shoulder ring, between the pin bushing and the pressure shoulder ring takes place.

The provided in the bearing assembly according to the invention at least one feather key ensures a torsion-proof connection of both the Zap- fenbuchse as well as the pressure shoulder ring with the roll neck of the rolling mill roll. Therefore, the coupling device between the pin bushing and the pressure shoulder ring is no longer mechanically stressed during operation of the rolling mill roll; In particular, it does not have to prevent a relative movement between the pin bushing and the pressure shoulder ring. It is therefore inventively designed so that either no or only a slight tension arises between the pin bushing and pressure shoulder ring. In particular, the coupling device is not mechanically stressed even during the rolling operation. The coupling device according to the invention as a connection between the pin bushing and the pressure shoulder ring is advantageously used as a driver for removing the pin bushing with the help of the pressure shoulder ring when the pressure switch ring acts as a piston during its disassembly of the roll neck and is acted upon by a pressure medium. Then the pin bushing can be withdrawn together with the pressure shoulder ring in the axial direction of the roll neck.

According to a first embodiment, the coupling device is formed as a screw for realizing a screw connection between the Zapfenbuch- se and the pressure shoulder ring, however, the pin bushing and the pressure shoulder ring are not or only slightly braced with each other. The term "low tension" in the present specification means that the tension is less than the tension when the screw would be tightened at rated torque and the pin sleeve and the pressure shoulder ring would be clamped accordingly.

The shank of the screw is inserted through a hole in the pressure shoulder ring and screwed into the pin bushing. A screw in the pressure shoulder ring is not required. According to a further embodiment of the invention, the shank of the screw between the screw head and a threaded part has a stepped part, preferably without thread, having a length which is greater than the depth of the bore in the pressure shoulder ring. By the formation of the stepped part of the shank of the screw with the claimed length ensures that a tension between the pressure shoulder ring and the pin bushing is at least largely prevented. In addition, an unnecessary load on the screw is prevented in this way.

According to the invention, a screw lock is preferably provided in order to prevent loosening of the screw, in particular during operation of the rolling mill roll. This could lead to damage in the bearing assembly.

Various possibilities for the realization of the screw lock are the subject of the dependent claims. The above object is further achieved by a roller unit. The advantages of this solution correspond to the advantages mentioned above with respect to the bearing arrangement.

The description is attached to four figures, wherein

Figure 1 shows the bearing assembly according to the invention and the roller unit according to the invention; Figure 2 shows the screw according to the invention;

FIG. 3 shows the screw according to the invention with first variants for securing the screw; and FIG. 4 d the screw according to the invention with further variants for

Screw lock shows.

The invention will be described in detail below with reference to the mentioned figures. In all figures, the same technical elements are designated by the same reference numerals.

Figure 1 shows one half of a roller unit according to the invention, wherein the roller unit comprises a rolling mill roll 200 with a roll neck 210 and a the bearing pin associated bearing assembly according to the invention.

The bearing arrangement comprises a bearing housing 1 10, also called a chock, and a bearing bush 120 installed in the bearing housing. A journal bush 130 is rotatably mounted in the bearing bush. The bearing assembly further comprises a bearing device 140, d. H. typically a roller or roller bearing, for the roll neck 210 and a pressure shoulder ring 135 arranged between the journal bushing 130 and the bearing device 140. In the arrangement according to the invention, at least one feather key 150 is provided for rotationally fixed connection of both the journal bushing and the pressure shoulder ring with the roll neck 210 Alternatively, two feather keys may also be provided for the respective individual twist-proof connection of the journal bushing 130 and the pressure shoulder ring 135 to the roll journal 210. A nut which can be screwed onto a shoulder of the roll neck serves to secure the bearing assembly against axial displacement. Specifically, occur during a rolling axial forces, which tend to move the bearing assembly, but in particular the pin bushing in the axial direction of the roll barrel away. This is prevented by the pin bushing being positively supported on the nut 160 via the pressure shoulder ring and the bearing device 140.

According to the invention, in addition to the key example, a screw is provided as a coupling device between the pin bushing and the pressure shoulder ring, wherein the screw connection is formed without or with only slight tension between the pin bushing and the pressure shoulder ring. As can be seen in Figure 1, the screw is inserted through a hole in the pressure shoulder ring 135 and screwed into the journal sleeve 130 with its threaded portion 172. A stepped between the screw head 176 and the threaded portion 172 stepped portion 174 of the screw is preferably formed without thread and has a length L which corresponds to at least the depth of the bore in the pressure shoulder ring 1 35; see Figure 2. This special design of the screw ensures that in principle no tension between the pressure shoulder ring and the pin bushing 130 takes place; This is especially true when an air gap remains between the screw head and the contact surface on the pressure shoulder ring, as shown by way of example in FIG. Then, even when tightening the screw with nominal torque, a tension between the pressure shoulder ring 135 and the pin bushing 130 is not possible.

FIG. 3 shows various possibilities of securing against soldering. So z. B. an adhesive 1 83 are applied when screwing the screw into the pin bushing on the threaded portion 172 to secure the screw against loosening. For the same purpose may also serve a washer 182, which z. B. made of elastic material or as a spring ring. Furthermore, the screw lock can be formed by a wire 184, which can be inserted through a hole in the screw head through and z. B. is secured to the pressure shoulder ring.

According to FIG. 4, the screw lock may be in the form of a soft steel slip 185 in conjunction with plastically deformable lugs 146 attached to the screw head, which are engageable by bending with the soft steel washer. As an alternative to a screw, the coupling device can be designed as desired, for. B. in the form of barbs. It is only important that the coupling device is constructed so that it transmits an axial force which acts in the direction of the roll barrel away on the pressure shoulder ring, on the pin bushing. In this way, the coupling device is able to act as a driver to take along the pin bushing when the pressure shoulder ring is withdrawn in the axial direction of the roll neck.

Bearing assembly for a rolling mill roll, rolling unit and method of disassembling a bearing assembly

LIST OF REFERENCE NUMBERS

100 bearing arrangement

1 10 bearing housing

20 bearing bush

130 pin bush

135 pressure shoulder ring

140 storage facility

42 lids

143 Fuse screw connection

150 feather key

160 mother

170 screw

172 threaded part

174 offset part

176 screw head

182 Unterlegsch

183 adhesive substance

184 wire

186 deformable nose

200 rolling mill roll

210 roll necks

300 space

Claims

claims:

1 . A bearing assembly (100) for a mill roll (200) having a roll neck (210), the bearing assembly comprising:

a bearing housing (1 10);

a fixedly in the bearing housing bearing bush (120);

a pin bushing (130) rotatably mounted in the bearing bush;

a bearing means (140) for the roll neck;

a pressure shoulder ring (135) disposed between the pin bushing (130) and the bearing means (140);

at least one key (150) for non-rotatably connecting both the journal sleeve (130) and the pressure shoulder ring (135) with the roll neck (210) of the mill roll; and

a screwed onto the roll neck nut (160) for securing the bearing assembly against axial displacement;

marked by

at least one coupling device (170) for coupling the pin bush (130) with no or only slight tension to the pressure shoulder ring (135).

2. Bearing arrangement according to claim 1, characterized in that the coupling device is designed in the form of a screw for realizing a screw connection with little or no tension between the pin bushing and the pressure shoulder ring.

3. Bearing arrangement (100) according to claim 2, characterized in that the shank of the screw inserted through a hole in the pressure shoulder ring (135) and with a threaded part in the pin bushing (135). is screwed.

4. Bearing arrangement according to claim 3, characterized in that the shank of the screw between its screw head (176) and the threaded portion (172) has a stepped portion (174), preferably without thread, having a length (L) which is greater than the depth of the hole in the pressure shoulder ring.

5. Bearing arrangement (100) according to one of claims 2 to 4, characterized by a screw lock for securing the screw (170) against unintentional release.

6. Bearing assembly (100) according to claim 5, characterized in that the screw lock is formed in the form of a washer (182) for the screw, wherein the washer is formed of elastic material or as a spring ring.

7. Bearing assembly (100) according to any one of claims 5 or 6, characterized in that the screw lock is formed in the form of adhesive (183), which is applied when screwing the screw in the pin bushing (130) on the threaded portion (172).

8. Bearing arrangement (100) according to one of claims 5 to 7, characterized in that the screw lock is formed in the form of a wire (184) which is inserted, inter alia, by the screw head (176).

9. bearing arrangement (100) according to one of claims 5 to 8, characterized in that the screw lock is formed in the form of a washer (182) made of soft steel in conjunction with attached to the screw head plastically deformable lugs (186), which by bending with the washer made of soft steel can be brought into engagement.

10. Bearing assembly (100) according to any one of claims 5 to 9, characterized in that the screw is tightened only with a torque which is smaller than the nominal torque.

1 1. Bearing assembly (100) according to claim 4, characterized in that a screw lock is that the screw is tightened with full rated torque.

12. Bearing arrangement (100) according to claim 1 1, characterized in that a gap between the screw head (176) and the bearing surface of the pressure shoulder ring (135) also remains after tightening the screw.

13. Rolling unit comprising:

a roll mill (200) with two roll necks (210); and

two bearing assemblies (100) according to any one of claims 1 to 12 for receiving each one of the two roll necks.