JP2000301208A - Divided back-up roll for rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify assembly work of a divided back-up roll whose crown pattern is adjustable. SOLUTION: In this back-up roll, cylindrical parts 11 to 16 for mounting bearings the outside diameters of which are mutually different are eccentrically formed in several places in the axial direction of a core shaft 19. By taking that it is necessary to assemble each ball bearing 20A, 20B, 30A, 30B, 40A, 40B from one direction on the core shaft 10 into consideration, the size of the outside diameter of each cylindrical part 11 to 16 for mounting the bearing is set so as to be gradually larger toward the downstream side from the upstream side in the assembling direction and also plural cocentric bushes 50 to 55 having the size of the inside diameter corresponding to the size of the outside diameter of the cylindrical part are mounted by out-fitting on such each cylindrical part for mounting the bearing. In this way, the generation of failure that rolling water enters into the inside of the ball bearing through the key way for making the eccentric bush detent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a split backup roll for a rolling mill. This split backup roll is used, for example, in a multi-stage cluster rolling mill.

[0002]

2. Description of the Related Art Conventionally, since the rolling load of a work roll on a plate material to be rolled becomes excessive on the edge side, the thickness of the plate material at both ends in the width direction becomes smaller than the thickness at the center in the width direction. It is known.

On the other hand, in a multi-stage cluster rolling mill,
The crown pattern of the divided backup roll at a required circumferential angle position can be adjusted, and by adjusting this crown pattern, the above-described thickness variation can be suppressed.

The configuration of the split backup roll capable of adjusting the crown pattern is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 1-23701.
As shown in Japanese Patent Application Publication No. 1 (1993), eccentric bushes having different amounts of eccentricity are mounted at several positions in the axial direction on the outer periphery of the core shaft, and double-row roller bearings are externally fitted to the outer periphery of each eccentric bush. By changing the phase angle of the core shaft, the crown pattern of the outer race of each double row roller bearing is variably adjusted.

[0005]

In the above-mentioned split backup roll in which the crown pattern can be adjusted, it is necessary to mount the eccentric bush in a state where the eccentric bush is prevented from rotating with respect to the core shaft. For this purpose, a key is provided on the core shaft. At the same time, a keyway is provided in the eccentric bush so that they are key-connected.

However, since the above-described key groove of the eccentric bush may be in communication with the lubricating oil supply passage to the double row roller bearing, the rolling water flows from the key groove through the lubricating oil supply passage through the double row roller lubricating oil supply passage. In some cases, they may enter the interior of the roller bearing, leading to a reduction in bearing life.

On the other hand, the applicant of the present application considered that the eccentric bush was abolished, and instead, the cylindrical portion for mounting the bearing was formed eccentrically on the outer peripheral surface of the core shaft. However,
With this configuration, it becomes impossible to incorporate a double row roller bearing into each bearing mounting cylindrical portion formed eccentrically to the core shaft. This is because when incorporating double row roller bearings into the core shaft, it is necessary to sequentially incorporate double row roller bearings from one shaft end side of the core shaft, but from one shaft end side of the core shaft to the other shaft end side. When the relative position between the core shaft and the plurality of roller bearings when the double-row roller bearing passes through each bearing mounting cylindrical portion is adjusted because the plurality of eccentric bearing mounting cylindrical portions are provided. It is necessary to finely displace either the core shaft or the multiple roller bearing up, down, left, and right. This displacement work is very troublesome.

In view of such circumstances, an object of the present invention is to make it possible to simplify an assembling operation in a split backup roll capable of adjusting a crown pattern.

[0009]

According to a first aspect of the present invention, there is provided a split backup roll for a rolling mill, wherein a crown is provided at a required angular position on the outer ring of each of the rolling bearings disposed at several locations in the axial direction of the core shaft. The crown pattern is variably adjusted when the pattern is made parabolic and the core shaft is rotated by a rotation operation unit provided at one end of the shaft, and the other shaft is provided at several positions in the axial direction of the core shaft. A bearing mounting cylindrical portion whose outer diameter is gradually increased from the end side toward the rotating operation unit side is provided, and the bearing mounting cylinder is closer to the rotating operation unit than the axially center bearing mounting cylindrical unit. The part is formed eccentrically with respect to the core axis so that the required angular position on the outer peripheral surface thereof is flush with the cylindrical part for mounting the bearing in the axial center, and the cylindrical part for mounting the bearing in the axial center is formed. For mounting the bearing on the other end of the shaft With respect to the core shaft, the cylindrical portion is aligned with the bearing mounting cylindrical portion at the center in the axial direction so that the angular position facing the bearing mounting cylindrical portion on the rotation operation portion side by 180 degrees on the outer peripheral surface thereof is flush with the bearing mounting cylindrical portion. The concentric bushing which is formed eccentrically and has the same outer diameter and the inner diameter set to be approximately the same as the outer diameter of each bearing mounting cylindrical portion is fitted to each of the bearing mounting cylindrical portions. Rolling bearings having the same outer diameter and inner diameter are fitted to each of these concentric bushes.

In short, in the present invention, the eccentric bush as in the conventional example is eliminated, and the bearing mounting cylindrical portions having different outer diameters are eccentrically formed at several places in the axial direction of the core shaft. In consideration of the need to incorporate each rolling bearing from one direction with respect to the core shaft, the outer diameter of each bearing mounting cylindrical portion is set to gradually increase from upstream to downstream in the mounting direction, and A plurality of concentric bushes having an inner diameter corresponding to the outer diameter of the bearing mounting cylindrical portion are externally mounted.

This eliminates the disadvantage that the rolling water intrudes from the keyway for preventing the eccentric bush from rotating as in the prior art.

When each of the concentric bushings is mounted on the core shaft, the concentric bush having a larger inner diameter is connected to a cylindrical portion having an outer diameter gradually increasing toward the rotating operation portion of the core shaft. Since the concentric bushes can be sequentially mounted, the insertion work until the concentric bush reaches the corresponding bearing mounting cylindrical portion can be easily performed.

In addition, since the required angular position of the circumference of the bearing mounting cylindrical portion on the side opposite to the rotating operation portion with respect to the axially central bearing mounting cylindrical portion of the core shaft is aligned, the rolling is performed. When mounting the bearing, the vertical position of the rolling bearing can be kept fixed without displacing the vertical position of the rolling bearing up to the position of the bearing mounting cylindrical portion at the center in the axial direction. After passing through the portion, the vertical position of the rolling bearing can be maintained in a fixed posture without being displaced in the same manner as described above. This simplifies the feeding operation until the concentric bush reaches the corresponding bearing mounting cylindrical portion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

1 to 9 show an embodiment of the present invention. FIG. 1 is a side view showing a schematic configuration of a multi-stage cluster mill, FIG. 2 is a perspective view of a split backup roll, FIG. 3 is a vertical sectional front view of the split backup roll, and FIG.
FIG. 5 is a perspective view of the core shaft of the split backup roll, and FIG.
FIG. 6 is a cross-sectional view taken along line (X)-(X) of FIG. 3, viewed from the direction of arrow Y. FIG. 6 is a cross-sectional view taken along line (X)-(X) of FIG. FIGS. 7A and 7B are (X)-of FIG.
FIG. 8 is a view in which only the core shaft is viewed from the direction of arrow Z with the cross section taken along line (X). FIG. 8 is an explanatory diagram showing a form in which an assembly of a first edge bearing and a concentric bush is mounted on the core shaft. FIG. 9 is an explanatory view showing an embodiment in which the assembly of the first center bearing and the concentric bush is mounted on the core shaft. In these drawings, the dimensional deviation of each part is exaggerated in order to emphasize the points of the invention.

In FIG. 1, reference numeral 1 denotes a work roll which is disposed one by one on the upper and lower sides, 2 denotes an intermediate roll which is disposed two by two on the upper and lower sides, and 3 denotes a small-diameter divided reinforcement which is disposed one by one on the upper and lower sides. Rolls 4 are divided backup rolls which are arranged two by two at the top and bottom. A work W such as a plate material is passed between the upper and lower work rolls 1.

Incidentally, the divided backup roll 4
The crown pattern at an angular position in contact with the intermediate roll 2 can be changed so that the contact pressure of the intermediate roll 2 with respect to each portion in the axial direction can be variably adjusted.

More specifically, the split backup roll 4
Double row roller bearings 20 are provided at six locations in the axial direction of the core shaft 10 respectively.
A, 20B, 30A, 30B, 40A, 40B are externally fitted via concentric bushes 50-55.

The two double row roller bearings 2 at the center in the axial direction
0A and 20B are called center bearings, two double row roller bearings 30A and 30B on both sides are called quarter bearings, and two double row roller bearings 40A and 40B at both axial ends are called edge bearings.

Of these, two center bearings 20A, 20A
The rotation center of B coincides with the rotation center O of the core shaft 10, but the remaining four bearings 30A, 30B, 40A, 40B
Rotation center P ₁ to P ₄ of is eccentrically individually with respect to the rotation center O of the core shaft 10. The quarter bearing 3
Assuming that the eccentricity of 0A and 30B is h, the edge bearing 40
The amount of eccentricity of A and 40B is set as large as 2h.
By such an eccentric state of each of the bearings 20 to 40, a crown pattern is formed in a parabolic shape at one circumferential position in contact with the intermediate roll 2.

A rotary operation gear 60 meshed with a rotary drive mechanism (not shown) is provided at one axial end of the core shaft 10.
By rotating in the clockwise or counterclockwise direction as indicated by the arrow, the crown pattern at the portion abutting on the intermediate roll 2 can be variably adjusted.

In the following, each of the bearings 20A, 20B,
Among the 30A, 30B, 40A, and 40B, those located on the rotation operation gear 60 side are referred to as a first edge bearing 40A, a first quarter bearing 30A, and a first center bearing 20A, and are located on the opposite rotation operation gear 60 side. These are referred to as a second edge bearing 40B, a second quarter bearing 30B, and a second center bearing 20B.

Next, the features of the present invention will be described. That is, in the split backup roll 4 as described above, the quarter bearings 30A and 30B and the edge bearing 40
As shown in FIGS. 3 and 4, quarter bearings 30A, 30B and edge bearings 40A, 40B are eccentric with respect to the rotation center O of the core shaft 10.
A, the cylindrical portions 11, 12, 1
5 and 16 are formed eccentrically with respect to the rotation center O of the core shaft 10, and quarter bearings 30A and 30B and edge bearings 40A and 40B are externally fitted thereto through concentric bushes 50 to 55. Note that, in the core shaft 10, the cylindrical portions 13, 14 are provided at the mounting portions of the center bearings 20A, 20B.
Are formed concentrically with respect to the rotation center O of the core shaft 10. In the following, the above-described eccentric cylindrical portion 11, 1
2, 15 and 16 are called eccentric cylindrical portions, and concentric cylindrical portions 1
3 and 14 are called concentric cylindrical portions.

As described above, the four cylindrical portions 11, 12, 15, and 15 are attached to the core shaft 10 without using a conventional eccentric bush.
If the bearings 20A, 2 are formed integrally with each other by rolling the rolling water along the keyway as in the conventional example,
It is possible to avoid the problem of invading the insides of 0B, 30A, 30B, 40A, and 40B.

Since the rotation operation gear 60 is mounted on one end of the shaft 10, such a shaft 1
0 and concentric bushes 50-55 and each bearing 20
When mounting A, 20B, 30A, 30B, 40A, 40B, the mounting direction must be from the other shaft end side where the rotation operation gear 60 does not exist on the core shaft 10.

At this time, the eccentric cylindrical portions 11, 1 of the core shaft 10
When the outer diameters 2, 15, 16 and the concentric cylindrical portions 13, 14 are set to the same outer diameter, it becomes difficult to mount the concentric bushes 50 to 55, so that the following (1) to (4) are specified. .

(1) Eccentric cylindrical portion 11, 1 of core shaft 10
2, 15, 16 and the outer diameter dimensions SR1 to SR6 of the concentric cylindrical portions 13, 14 are calculated as SR1>SR2> SR3 = SR4>
SR5> SR6 is set.

(2) The outer diameter of each of the concentric bushes 50 to 55 is the same, and the inner diameter BR1
To BR6 according to the outer diameter of each of the cylindrical portions 11 to 16 of the core shaft 10, BR1>BR2> BR3 = BR4>BR5>
The relationship is set to BR6.

Here, BR1 is the inner diameter of the concentric bush 50 for the first edge bearing 40A, BR2 is the inner diameter of the concentric bush 51 for the first quarter bearing 30A, BR3.
BR4 is a concentric bush 5 for the center bearings 20A and 20B.
2,53 inner diameter dimension, BR5 is the second quarter bearing 30B
BR6 is the inner diameter of the concentric bush 55 for the second edge bearing 40B. SR1 is an eccentric cylindrical portion 11 for the first edge bearing 40A.
, SR2 is the outer diameter of the eccentric cylindrical portion 12 for the first quarter bearing 30A, and SR3, SR4 are the concentric cylindrical portions 1.
3 and 14 outer diameter dimensions, SR5 is the second quarter bearing 30B
The outer diameter dimension of the eccentric cylindrical portion 15 for the second eccentric cylindrical portion 15 and SR6 is the outer diameter size of the eccentric cylindrical portion 16 for the second edge bearing 40B.

(3) As shown in FIG. 3, with respect to the two eccentric cylindrical portions 11 and 12 on the rotating operation gear 60 side, one point at a required circumferential position on their outer peripheral surfaces is concentric cylindrical portions 13 and 14. The two eccentric cylindrical portions 15 and 16 on the anti-rotational operation gear 60 side are flush with the outer peripheral surfaces of the eccentric cylindrical portions 11 and 1 on their outer peripheral surfaces.
2 is concentric cylindrical part 1
It is set so as to be flush with the outer peripheral surfaces of 3, 14.

(4) Each bearing 20A, 20B, 30A,
30B, 40A, 40B inner diameter dimension and outer diameter dimension,
Let them be the same. However, the first and second edge bearings 40
A, 40B, other bearings 20A, 20B, 30
The width is set larger than A and 30B.

As described above, the center bearing 20A,
When the eccentricity of the quarter bearings 30A, 30B with respect to the center bearing 20A, 20B is 2h, and the eccentricity of the edge bearings 40A, 40B with respect to the center bearings 20A, 20B is 2h, S
R1 = SR3 (SR4) + 4h, SR2 = SR3 (SR
4) + 2h, SR5 = SR3 (SR4) -2h, SR6
= SR3 (SR4) -4h, and similarly,
BR1 = BR3 (BR4) + 4h, BR2 = BR3 (B
R4) + 2h, BR5 = BR3 (BR4) -2h, BR
6 = BR3 (BR4) -4h.

Each of the bushes 50 to 55 may be loosely fitted to each of the cylindrical portions 11 to 16 so as to be easily mounted. That is, BR1 = SR1 + Δα, BR2 = SR2 + Δα, B
R3 = SR3 + Δα, BR4 = SR4 + Δα, BR5 =
SR5 + Δα, BR6 = SR6 + Δα are set. With such a fitting form, each bush 50
55 may creep, but even if it does creep, there is no problem because the crown pattern does not change.

In this way, each double row roller bearing 20
A, 20B, 30A, 30B, 40A, 40B can make the crown pattern at a required circumferential position parabolic, and moreover, each double row roller bearing 20A, 20B.
B, 30A, 30B, 40A, and 40B, the concentric bushes 50 to 55 are smoothly inserted when sequentially mounted from the anti-rotational operation gear 60 side to a required axial position of the core shaft 10. Will be able to

For example, as shown in FIG. 8, when the assembly of the first edge bearing 40A and the concentric bush 50 is mounted on the eccentric cylindrical portion 11 closest to the rotation operation gear 60 side of the core shaft 10, Since the inner diameter of the concentric bush 50 is larger than that of the other cylindrical portions 12 to 16, it is easy to pass the same. As shown in FIG. 9, when the assembly of the first center bearing 20 </ b> A and the concentric bush 52 is mounted on the concentric cylindrical portion 13 at the center of the core shaft 10, the inner diameter of the concentric bush 52 is different from that of the other. Since it is larger than the cylindrical portions 14 to 16, it is easy to pass through.

In short, first, the cylindrical portion 11 whose outer diameter gradually increases toward the rotation operation gear 60 side of the core shaft 10.
Since it is only necessary to mount the concentric bushes in order of size from 16 to 16, the insertion work until the concentric bush reaches the corresponding cylindrical portion can be easily performed.

Further, in the core shaft 10, the concentric cylindrical portions 13 and 14 for the center bearings 20A and 20B, the eccentric cylindrical portion 15 for the second quarter bearing 30B, and the second edge bearing 40 are provided.
With respect to the eccentric cylindrical portion 16 for B, the required angular positions of the circumference are made flush with each other, so that when it is passed through the assembly of each bearing and the concentric bush, their vertical position is almost displaced. In a fixed position without passing through the concentric cylindrical portions 13 and 14, as described above, the fixed position can be maintained without displacing the vertical position. . Therefore, each bearing 20
The assembly of A, 20B, 30A, 30B, 40A, 40B and each of the concentric bushes 50 to 55 is connected to the corresponding cylindrical portion 11 to
That is, the feeding operation until the number reaches 16 is simplified.

[0038]

As described above, according to the present invention, the split backup roll capable of adjusting the crown pattern has a structure that simplifies the assembling work while preventing rolling water from entering the rolling bearing. Therefore, the life of the bearing can be improved and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a multi-stage cluster mill according to an embodiment of the present invention.

FIG. 2 is a perspective view of a divided backup roll in FIG.

FIG. 3 is a vertical sectional front view of the divided backup roll of FIG. 2;

FIG. 4 is a perspective view of a core shaft of the divided backup roll of FIG. 2;

5 is a cross-sectional view taken along line (X)-(X) in FIG.

FIG. 6 is a view in which only the core axis is viewed from the direction of arrow Y when the line (X)-(X) in FIG. 3 is sectioned;

FIG. 7 is a view in which only a core axis is viewed from an arrow Z direction with a cross section taken along line (X)-(X) in FIG. 3;

FIG. 8 is an explanatory view showing an embodiment in which an assembly of a first edge bearing and a concentric bush is mounted on a core shaft.

FIG. 9 is an explanatory view showing a form in which an assembly of a first center bearing and a concentric bush is mounted on a core shaft.

[Explanation of symbols]

Reference Signs List 2 Intermediate roll 4 Split backup roll W Work 10 Core shaft of split backup roll 11 Eccentric cylindrical portion for first edge bearing on core shaft 12 Eccentric cylindrical portion for first quarter bearing on core shaft 13 First center bearing on core shaft Concentric cylindrical portion for second center bearing on core shaft 15 Eccentric cylindrical portion for second quarter bearing on core shaft 16 Eccentric cylindrical portion for second edge bearing on core shaft 20A First center bearing 20B Second center bearing 30A First quarter bearing 30B Second quarter bearing 40A First edge bearing 40B Second edge bearing 50 Concentric bush for first edge bearing 51 Concentric bush for first quarter bearing 52 Concentric for first center bearing Bush 53 Concentric bush for second center bearing 54 Concentric bush for second quarter bearing Interview 55 concentric bush 60 turning operation gear for the second edge bearing

Claims (1)

[Claims] 1. A rotating operation part having a parabolic crown pattern at the required circumferential position of the outer ring of each of the rolling bearings disposed at several locations in the axial direction of the core shaft, and the core shaft provided at one axial end thereof. A backup roll for a rolling mill in which the crown pattern is variably adjusted when the rotary operation is performed by the rotary shaft. A bearing mounting cylindrical portion whose diameter dimension is set to be gradually increased is provided, and a required angular position on the outer peripheral surface of the bearing mounting cylindrical portion on the rotating operation unit side with respect to the axially central bearing mounting cylindrical portion. Is formed eccentrically with respect to the core shaft so as to be flush with the bearing mounting cylindrical portion in the axial center, and the bearing mounting cylindrical portion on the other axial end side of the axially central bearing mounting cylindrical portion. About the outer peripheral surface These bearings are formed so as to be eccentric with respect to the core shaft so that the angular position 180 ° opposite to the bearing mounting cylindrical portion on the rotating operation unit side is flush with the axially center bearing mounting cylindrical portion. Concentric bushes whose outer diameters are the same as each other and whose inner diameters are set to be substantially the same as the outer diameters of the respective bearing mounting cylinders are externally fitted to the mounting cylinders. And a rolling backup roll for a rolling mill, wherein rolling bearings having the same outer diameter and inner diameter are fitted to each other.