JP5652129B2 - Double row cylindrical roller bearings for multi-stage rolling rolls - Google Patents

Description

The present invention relates to a double row cylindrical roller bearing for a multi-stage rolling roll, such as a rolling roll bearing, used in a steel rolling mill, for example.

  Cylindrical roller bearings are used for backup rolls incorporated to support work rolls or intermediate rolls of a steel multi-stage rolling mill. As shown in FIG. 5, the multi-high rolling mill 400 is provided with a pair of work rolls 40 that sandwich and press a material to be rolled and form it thinly. A plurality of intermediate rolls 41 and backup rolls 42 are disposed behind the work roll 40 so as to support a strong rolling force received by the work roll 40.

  As shown in FIG. 1, the backup roll 42 is configured by alternately arranging saddles 11 and 11 and cylindrical roller bearings 100 on the backup roll shaft 10. Cylindrical roller bearings 100 used for the backup roll 42 are inner rings 1 and outer rings 2 which are raceways, cylindrical rollers 3 and 3 which are arranged in a double row so as to roll between both raceways 1 and 2, and cylindrical rollers. 3, and 3, 3, 3, 3, 3, 3, 3, 3, 3, 3. A flange 2 a is formed at the center of the outer ring 2 in the axial direction.

  The backup roll 42 performs backup by directly supporting the work roll 40 or the intermediate roll 41 on the outer ring outer diameter surface of the cylindrical roller bearing 100 to be used. At this time, a thrust load acts on the cylindrical roller bearing 100 due to misalignment of the backup roll shaft 10 with respect to the shaft of the work roll 40 or the intermediate roll 41.

  The cylindrical roller bearing 100 receives the thrust load received by the outer ring by the saddle 11 from the outer ring collar 2a through the cylindrical roller end faces 3a and 3a and the collar ring 5 as shown in FIG. Contact portions between the collar rings 5 and 5 and the cylindrical roller end surfaces 3a and 3a receive a thrust load in a rolling and sliding state. For this reason, the surfaces of the collar rings 5 and 5 that are in contact with the cylindrical roller end surfaces 3a and 3a are subjected to processing and surface treatment for wear resistance.

  In addition, contact with other rolls and biting of foreign matter such as iron powder may always occur during operation of the equipment, and as a result, the outer ring outer diameter surface shape and surface roughness gradually deteriorate. Go. Therefore, the backup roll 42 is periodically removed from the rolling mill, the outer ring outer diameter surface of the cylindrical roller bearing 100 is polished, finished to a predetermined shape and surface roughness, and then incorporated into the rolling mill again. When the outer ring outer diameter surface of the cylindrical roller bearing 100 is polished, the cylindrical roller bearing is generally disassembled, only the outer ring 2 is set in a polishing machine, and the assembly is processed again after polishing.

  When the bearings are assembled, the collars 5 and 5 are oriented on the side that comes into contact with the cylindrical roller end faces 3a and 3a that are subjected to wear resistance and the side that comes into contact with the saddle 11 that is not subjected to wear resistance. Therefore, it is necessary to arrange it on the end face of the inner ring 1 in the correct orientation. For this reason, the collars 5 and 5 are provided with markings such as engravings indicating directionality, and the drawing of the bearing describes that the arrangement direction of the collar ring can be understood.

  However, in the actual work of assembling the bearing and assembling the backup roll 42, the bearing drawing may not be presented, and it is incorporated into the bearing in a state that is not in a normal direction without recognizing the directionality of the collars 5 and 5. There is a possibility that. Furthermore, there is a possibility that the bearing is incorporated into the rolling mill in this state.

  As a result, the surfaces of the collar rings 5 and 5 that have not been subjected to the anti-abrasion treatment are in rolling contact with the cylindrical roller end faces 3a and 3a. May result.

  As a prior art of this part, there is JP-A-2004-11661 (Patent Document 1).

  FIG. 1 of the prior art document has an inner ring wider than the outer dimension of the double row rolling elements, and a collar ring is arranged on the side of the inner ring so as to cover the end face and the end of the inner ring. A structure is disclosed. In a bearing having a collar ring of such a shape, if the direction of the collar ring is reversed, the portion covering the inner ring end face protrudes outward, and the dimension of the combination of the collar ring and the inner ring increases. It prevents the work from proceeding with the wrong assembly.

JP 2004-11661 A

  However, there is a problem that the length of the roller is restricted because the collar ring covers a part of the outer diameter surface of the inner ring.

  Therefore, the present invention has an object to prevent the collar ring from being assembled in the wrong direction when the bearing and the collar ring are assembled to the backup roll shaft, and not to be restricted by the length of the roller.

In order to solve the above problem, the invention described in claim 1
An outer ring having a plurality of rows of outer ring raceway surfaces formed on the inner diameter part;
An inner ring having an inner ring raceway surface formed on the outer diameter part;
A plurality of cylindrical rolling elements arranged in a plurality of rows between the outer ring raceway surface and the inner ring raceway surface and interposed so as to freely roll,
In a double row cylindrical roller bearing consisting of
Radially intermediate the end surfaces and said inner ring having a counterbore formed over axis direction the entire circumference,
An inlay portion having a depth smaller than the axial dimension of the counterbore and an outer diameter smaller than the radial diameter of the counterbore is formed on one end surface, and when the inlay portion is disposed on the side of the inner ring, the inlay portion is countersunk of the inner ring. and a pair of flange wheels configured so as to fit in,
The double-row cylindrical roller bearing , wherein the collar ring has a contact surface that contacts both an end surface of the inner ring and an end surface of the cylindrical rolling element .

  The present invention has the configuration as described above, and there is no restriction on the size of the roller by the collar ring, and there is an effect that it is possible to prevent the collar ring from being incorporated into the bearing in the wrong direction.

It is a figure which shows the structure of the conventional backup roll and a bearing. It shows the transmission path of the thrust load acting on the backup roll bearing. 1 shows a first embodiment of the present invention. 2 shows a second embodiment of the present invention. The structure of a multi-high rolling mill is shown.

  Embodiments of the present invention will be described below with reference to the drawings.

  A first embodiment is shown in FIG. Inlays are formed on both end faces of the inner ring 1 a of the double row cylindrical roller bearing 200. The end faces of the collar rings 5a and 5a are formed with a counterbore that is larger in inner diameter than the inner diameter of the inner ring 1a and deeper than the height of the inner ring.

  The state in which the collar ring 5a, 5a is covered with the spigot of the inner ring 1a is covered with a correct combination of the bearing 200 and the collar ring 5a, 5a, and the combined width of the inner ring 1a and the collar ring 5a at that time Is W.

  As shown in FIG. 3b, when the counterbore of the collars 5a and 5a is arranged outward with respect to the inner ring 1a, that is, when the collars 5a and 5a are arranged in the wrong direction with respect to the inner ring 1a, The end surface and the counterbore side end surface of the collar rings 5a and 5a abut. At this time, the combined width of the inner ring 1a and the collar ring 5a is larger than the correct combined width W by the axial dimension of the spigot portions formed at both ends of the inner ring 1a.

  As a result, the operator can immediately recognize the mistake of the collar ring assembly.

  A second embodiment is shown in FIG. Counterbore is formed on both end faces of the inner ring 1b of the double row cylindrical bearing 300. On the end surfaces of the collar rings 5b, 5b, an inlay that is smaller than the inner diameter of the counterbore of the inner ring 1b and shorter than the counterbore depth of the inner ring 1b is formed. The operation and effect are the same as in the first embodiment.

  The present invention can be used as a rolling roll bearing used in, for example, a steel rolling mill.

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Inner ring 1b Inner ring 2 Outer ring 2a Outer ring collar part 3 Cylindrical roller 3a Cylindrical roller end face 4 Cage 5 Collar ring (Conventional)
5a collar ring (Example 1)
5b collar ring (Example 2)
10 Backup roll axis

Claims (1)

An outer ring having a plurality of rows of outer ring raceway surfaces formed on the inner diameter part;
An inner ring having an inner ring raceway surface formed on the outer diameter part;
A plurality of cylindrical rolling elements arranged in a plurality of rows between the outer ring raceway surface and the inner ring raceway surface and interposed so as to freely roll,
In a double row cylindrical roller bearing for a multi- stage rolling roll consisting of
Radially intermediate the end surfaces and said inner ring having a counterbore formed over axis direction the entire circumference,
An inlay portion having a depth smaller than the axial dimension of the counterbore and an outer diameter smaller than the radial diameter of the counterbore is formed on one end surface, and when the inlay portion is disposed on the side of the inner ring, the inlay portion is countersunk of the inner ring. and a pair of flange wheels configured so as to fit in,
The multi-row cylindrical roller bearing for a multi- stage rolling roll , wherein the collar ring has an abutting surface that abuts both an end surface of the inner ring and an end surface of the cylindrical rolling element .

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