JP5148314B2 - Backup roll device for multi-high mill - Google Patents

Description

  The present invention relates to a backup roll apparatus used in a multi-high rolling mill such as a Sendzimir mill.

The following patent document 1 discloses Sendzimir mill. For example, as shown in FIG. 1, the Sendzimir mill includes a pair of upper and lower rolling rolls, four first intermediate rolls that support the rolling rolls, and six second intermediate rolls that support the first intermediate rolls, And eight backup rolls supporting the second intermediate roll. The backup roll is rotatably supported by a shaft that passes through the center of the backup roll, and this shaft is supported in a state that it is prevented from rotating by a saddle. The saddle is supported on the rolling mill housing.
JP 2001-259721 A

As shown in FIG. 1, a rolling load indicated by an arrow acts on the backup roll from the rolling roll and the first and second intermediate rolls. Since the shaft of each backup roll is supported by the saddle while being prevented from rotating, each shaft receives the rolling load in a part in the circumferential direction via the backup roll.
On the other hand, since the backup roll is usually fitted to the shaft by a clearance fit, if the lubrication between the shaft and the backup roll is insufficient, it is locally applied to a portion of the circumferential direction of the shaft that receives the rolling load. Fretting wear tends to occur.
When wear powder due to fretting wear adheres to the shaft, it is necessary to polish it off during maintenance, but by repeatedly polishing only a portion of the shaft in the circumferential direction, the clearance with the backup roll increases in that portion, and more There is a problem that fretting wear tends to occur.

  This invention is made in view of the above situations, and provides the backup roll apparatus of the multistage rolling mill which can suppress that local fretting wear arises in the shaft of a backup roll. Objective.

A backup roll device for a multi-high rolling mill according to the present invention includes a shaft, a backup roll concentrically and rotatably supported on the shaft, a saddle supporting the shaft, and a plurality of the shafts with respect to the saddle. A rotation preventing means for preventing rotation at a rotational position , wherein the saddle is connected to an outer ring and an inner peripheral side of the outer ring so as to be relatively rotatable, and is prevented from rotating on the outer peripheral surface of the shaft. An inner ring that is fitted with the outer ring, and the anti-rotation means has an inner circumferential surface fitted to the outer circumferential surface of the shaft and is prevented from rotating by being connected to the outer ring. A ring, a key groove formed on the outer peripheral surface of the shaft, a key groove formed on the inner peripheral surface of the stopper ring, the key groove of the shaft and the stopper Comprising a key fitted to the ring keyway, the at least one keyway of a key groove and the stopper ring of the shaft, characterized in that it is formed in the circumferential direction a plurality of locations.

According to this configuration, for example, when removing the shaft from the saddle for maintenance and reattaching the shaft, the rotation position (circumferential position (angle)) of the shaft can be prevented from being rotated. Thereby, the range of the circumferential direction of the shaft which can receive a rolling load can be expanded substantially. Therefore, it is possible to suppress the occurrence of local fretting wear on the shaft.
Further, the shaft can be prevented from rotating with respect to the saddle by the stopper ring by fitting the key into the key groove of the shaft and the key groove of the stopper ring. And by changing the key groove to be used among the key grooves at a plurality of positions in the circumferential direction of the shaft or the stopper ring, the shaft can be prevented from rotating at different rotational positions.

  ADVANTAGE OF THE INVENTION According to this invention, the range of the circumferential direction of the shaft which can receive a rolling load can be expanded, and generation | occurrence | production of local fretting wear can be suppressed.

  FIG. 1 is a schematic side view of a multi-high rolling mill according to an embodiment of the present invention. The rolling mill 10 is a 20-stage cluster rolling mill having a 1-2-3-4 roll arrangement. A material to be rolled W such as a thin plate material is passed between a pair of upper and lower rolling rolls 11 in the left-right direction in FIG. 1 and rolled. The pair of upper and lower rolling rolls 11 are supported by four (two each of upper and lower) first intermediate rolls 12, and the four first intermediate rolls 12 are six (three each of upper and lower) second intermediate rolls 13. Is supported by. The second intermediate roll 13 is supported by eight (four each on the top and bottom) backup rolls 14 (14A to 14H).

  FIG. 2 is a schematic front view showing the backup roll 14 (14 </ b> A to 14 </ b> D) disposed on the upper side of the material W to be rolled. The backup roll 14 is composed of a plurality of divided rolls 15 in the axial direction, and each divided roll 15 is concentrically and rotatably attached to the shaft 16. As shown in FIG. 1, the shaft 16 is supported by a saddle 18 supported by a housing 17 of the rolling mill 10. In the present embodiment, six divided rolls 15 are arranged at predetermined intervals in the axial direction, and saddles 18 are disposed between the six divided rolls 15 and on the axially outer sides of the divided rolls 15 at both ends in the axial direction. Has been placed.

  3 is a detailed cross-sectional view of a part A in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. Each divided roll 15 includes an inner ring 20 fitted to the outer peripheral surface of the shaft 16, an outer ring 21 disposed on the radially outer side of the inner ring 20, and a plurality of cylindrical rollers 22 disposed between the inner ring 20 and the outer ring 21. And a cage 23 for holding a plurality of cylindrical rollers 22. The inner ring 20 is fitted to the outer peripheral surface of the shaft 16 by a loose fit.

  The saddle 18 includes a shoe member 25, an outer ring (saddle ring) 26, an intermediate ring (eccentric ring) 27, and an inner ring 28. The shoe member 25 is made of a plate having an arc cross section and is supported by the housing 17. The outer ring 26 is fixed to the shoe member 25. An intermediate ring 27 is rotatably fitted to the inner periphery of the outer ring 26 via a plurality of needle rollers 30 (see FIG. 3). Further, an inner ring 28 is rotatably fitted to the inner periphery of the intermediate ring 27 via needle rollers 31 (see FIG. 3).

  The shaft 16 is fitted on the inner peripheral surface of the inner ring 28. A key groove 32 is formed on the outer peripheral surface of the shaft 16, and a key groove 33 is formed on the inner ring 28. Then, relative rotation between the inner ring 28 and the shaft 16 is prevented by the key 34 fitted in both the key grooves 32 and 33. The key grooves 32 of the shaft 16 are formed at a plurality of positions in the axial direction so as to correspond to the plurality of saddles 18 in the axial direction.

  As shown in FIGS. 3 and 4, a stopper ring 36 for preventing the shaft 16 from rotating with respect to the outer ring 26 of the saddle 18 is fitted to the outer peripheral surface of one axial end portion (right end portion) of the shaft 16. Has been. A key groove 37 is formed on the inner peripheral surface of the stopper ring 36, a key groove 38 is formed on the outer peripheral surface of one axial end of the shaft 16, and a key 39 is fitted in both the key grooves 37, 38. Yes. The key 39 prevents relative rotation between the stopper ring 36 and the shaft 16. Note that the key groove 38 is continuous with the key groove 32 at the end in the axial direction, and a key that is long in the axial direction and serves as the key 34 and the key 39 is fitted in the key grooves 32 and 38. .

  Fig.5 (a) is a front view of the stopper ring 36, (b) is CC sectional view taken on the line of (a). A part of the stopper ring 36 in the circumferential direction bulges in the radial direction, and a pin 41 protruding laterally is provided at the bulged portion. As shown in FIG. 3, the pin 41 is inserted into a recess 42 formed in the outer ring 26 of the saddle 18 at the axial end portion (right end portion), whereby a stopper ring 36 around the shaft center of the shaft 16. Is prevented from rotating. With the above structure, the shaft 16 is prevented from rotating with respect to the outer ring 26 of the saddle 18 via the stopper ring 36.

  The saddle 18 is provided with a crown control mechanism for controlling the plate shape of the material to be rolled. Specifically, as shown in FIG. 4, the inner ring 28 is formed such that the inner periphery and the outer periphery are concentric, while the intermediate ring 27 is formed so that the inner periphery and the outer periphery are eccentric from each other. ing. Therefore, when only the intermediate ring 27 is rotated in the outer ring 26, the inner ring 28 and the shaft center of the shaft 16 move, and the split roll 15 also moves accordingly. Further, as shown in FIG. 3, adjustment gears 43 are fixed to both side surfaces of the intermediate ring 27 of each saddle 18, and each intermediate ring 27 is rotated by rotating the adjustment gear 43 using a rack (not shown). Can be individually rotated to move each divided roll 15 individually. And by this movement of the division | segmentation roll 15, the crown control of a to-be-rolled material is possible.

  As shown in FIG. 4, the key grooves 32 and 38 of the shaft 16 are formed at intervals (90 ° intervals) at four locations in the circumferential direction. Further, the key grooves 37 (see FIG. 5) of the stopper ring 36 are also formed at four intervals in the circumferential direction (90 ° intervals). During maintenance or the like, the shaft 16 is moved at a different rotational position (circumferential position (angle)) by changing the key groove to be used among the plurality of key grooves 32, 38, 37 in the circumferential direction. Can prevent rotation.

  FIG. 6 is a schematic front view showing the backup roll 14 (14E to 14H) arranged below the material to be rolled, and FIG. 7 is a cross-sectional view taken along the line DD in FIG. The backup roll 14 includes a plurality of divided rolls 15 in the axial direction, and each divided roll 15 is rotatably attached to a shaft 45. The shaft 45 is supported by a saddle 47 supported by the housing 17 (see FIG. 1). In the present embodiment, six divided rolls 15 are arranged at predetermined intervals in the axial direction, and saddles 47 are arranged between the six divided rolls 15 and on the axially outer sides of the divided rolls 15 at both ends in the axial direction. ing. The above configuration is the same as that of the upper backup roll 14.

  However, the saddle 47 of the lower backup roll 14 does not include the intermediate ring 27 and the inner ring 28 unlike the saddle 18 of the upper backup roll 14, and the inner periphery of the saddle ring 48 fixed to the shoe member 46. The shaft 45 is directly fitted on the surface. A key groove 49 is formed at one axial end (right end) of the shaft 45, and a key groove 50 is formed on the inner peripheral surface of the saddle ring 48 at one end (right end) in the coaxial direction. A key 51 is fitted to 49 and 50. As a result, the shaft 45 is prevented from rotating with respect to the saddle 47.

  The key grooves 49 of the shaft 45 are formed at intervals (90 ° intervals) at four locations in the circumferential direction. Therefore, during maintenance or the like, the shaft 45 is prevented from rotating at different rotational positions (circumferential positions (angles)) by changing the key groove 49 to be used among the plurality of key grooves 49 in the circumferential direction. be able to.

  As shown in FIG. 1, a rolling load indicated by an arrow acts on the backup roll (divided roll) from the rolling roll 11 and the first and second intermediate rolls 12 and 13, and the shafts 16 and 45 are part of the circumferential direction. In response to the rolling load. However, in the present embodiment, since the positions in the circumferential direction of the shafts 16 and 45 can be changed as described above, the range in which the rolling load can be received can be substantially enlarged. Therefore, it is possible to suppress the occurrence of fretting wear locally in a part of the circumferential direction of the shafts 16 and 45.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, in the above-described embodiment, the key grooves 32, 38, 49 of the shafts 16, 45 and the key groove 37 of the stopper ring 36 are formed at four locations in the circumferential direction. It is possible to form more than one place. Further, the interval (circumferential pitch) does not necessarily have to be equal.

  In the upper backup roll 14, a plurality of key grooves 37 in the circumferential direction can be formed on the stopper ring 36, and key grooves 32 and 38 in one circumferential direction can be formed on the shaft 16. When the shaft 16 is not stopped by the stopper ring 36, the shaft 16 can rotate in the intermediate ring 27 together with the inner ring 28. Therefore, by rotating the shaft 16, the key groove 38 is set to any one of the stopper rings 36. This is because the key 39 can be fitted in correspondence with the key groove 37. Conversely, the key groove 37 of the stopper ring 36 may be formed at one place in the circumferential direction, and the key grooves 32 and 38 of the shaft 16 may be formed at a plurality of places in the circumferential direction.

It is also possible to form key grooves 33 and 50 at a plurality of locations in the circumferential direction on the inner peripheral surfaces of the saddles 18 and 47 (the inner peripheral surface of the inner ring 28 and the inner peripheral surface of the saddle ring 48).
In the above-described embodiment, the 20-stage multi-high rolling mill 10 has been exemplified, but the present invention is not limited to this, and the present invention can be applied to the multi-high rolling mill 10 having 6 stages, 12 stages, and the like.

1 is a schematic side view of a multi-high rolling mill according to an embodiment of the present invention. It is a schematic front view which shows the backup roll arrange | positioned above the to-be-rolled material in the multistage rolling mill of FIG. FIG. 3 is a detailed cross-sectional view of a part A in FIG. 2. It is a BB arrow sectional view of Drawing 2. (A) is a front view of a stopper ring, (b) is CC sectional view taken on the line of (a). It is a schematic front view which shows the backup roll arrange | positioned below the to-be-rolled material in the multistage rolling mill of FIG. It is DD sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling machine 14 Backup roll 16 Shaft 18 Saddle 26 Outer ring 28 Inner ring 32 Keyway 33 Keyway 34 Key 36 Stopper ring 37 Keyway 38 Keyway 39 Key 45 Shaft 46 Housing 47 Saddle 49 Keyway 50 Keyway 51 Key

Claims (1)

A shaft, a backup roll concentrically supported by the shaft and rotatably supported; a saddle supporting the shaft; and a detent means for preventing the shaft from rotating at a plurality of rotational positions with respect to the saddle. equipped and,
The saddle has an outer ring and an inner ring that is connected to the inner peripheral side of the outer ring so as to be relatively rotatable and is fitted to the outer peripheral surface of the shaft in a locked state.
The rotation preventing means includes a stopper ring that has an inner peripheral surface fitted to the outer peripheral surface of the shaft and is prevented from rotating by being connected to the outer ring, and a key groove formed on the outer peripheral surface of the shaft. And a key groove formed on the inner peripheral surface of the stopper ring, and a key fitted in the key groove of the shaft and the key groove of the stopper ring,
A backup roll device for a multi-high rolling mill, wherein at least one of the keyway of the shaft and the keyway of the stopper ring is formed at a plurality of locations in the circumferential direction .

Images