JP3151082B2 - Roll neck bearing device for rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll neck bearing device for a rolling mill.

[0002]

2. Description of the Related Art Usually, a roll of a rolling mill has a roll neck extending on both sides in the axial direction of the roll, and the roll neck is supported at both sides to support the roll necks on both sides.

However, for example, in a wire rod block mill, a roll of a rolling mill has a roll neck extending to one side in the axial direction of the roll, and is a cantilever supporting only the roll neck on one side. Therefore, in the roll neck, the deflection near the roll receiving the load at the time of rolling is greater than in the case of the double-sided support.

For this reason, a roll neck bearing for supporting the roll neck is one of the double rows of rollers of the bearing.
Since the load is concentrated on the rollers in the row on the roll side,
There is a problem that the rollers in the row on the roll side are damaged early.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a roll neck bearing device for a rolling mill, which can prevent early breakage due to roll neck bending.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a double row rolling element is provided between an inner ring and an outer ring, and a roll and a driving means are connected. In a roll neck bearing device for a rolling mill that is mounted on a roll neck and supports the roll in a cantilever manner, the diameter of the roll raceway surface of the inner race is determined from the diameter of the roll raceway surface of the outer race facing the rolling elements of the row on the roll race. And the roll-side rolling element radial gap, which is a value obtained by subtracting the diameter of the rolling element in the row on the roll side from the rolling element, is twice the diameter of the rolling element in the row on the driving side. It is characterized in that it is larger than the driving means rolling element radial direction gap which is a value obtained by subtracting the diameter of the driving means side raceway surface of the inner ring and twice the diameter of the rolling elements in the driving means side row from the diameter. .

[0007] The invention described in claim 2 is the first invention.
In the roll neck bearing device for a rolling mill, the rolling elements in the first row, the rolling elements in the second row, the rolling elements in the third row, and the fourth row are arranged from the roll side toward the driving means side. The rolling elements in the first row and the rolling elements in the third row have a first diameter, and the rolling elements in the second row and the fourth row are arranged in this order. The moving body has a second diameter larger than the first diameter, and the diameter of each raceway surface of the inner ring facing each of the rolling elements in the first, second, third, and fourth rows is equal, and The first row of rolling elements and the second row of rolling elements are sandwiched between the inner ring and the inner race, and the diameter of a first raceway surface facing the first row of rolling elements is equal to the diameter of the second row of rolling elements. The second facing the moving body
A third row of rolling elements and a fourth row of rolling elements are sandwiched between the first outer ring portion having the same diameter as the raceway surface and the inner ring,
The diameter of the third raceway surface facing the third row of rolling elements is equal to the diameter of the fourth raceway surface facing the fourth row of rolling elements, and the diameter of the third and fourth raceway surfaces is The first
And a second outer ring portion smaller in diameter than the first and second raceway surfaces of the outer ring.

[0008] The invention described in claim 3 is the first invention.
In the roll neck bearing device for a rolling mill, the rolling elements in the first row, the rolling elements in the second row, the rolling elements in the third row, and the fourth row are arranged from the roll side toward the driving means side. The rolling elements of the row are arranged in order, and the diameters of the rolling elements of the four rows are equal, and the diameter of each raceway surface of the inner ring facing each of the rolling elements of the first, second, third, and fourth rows. Are equal, and the outer ring faces the first row of rolling elements, and has an annular first shape having a first diameter.
A third raceway surface, an annular second raceway surface facing the second row of rolling elements and having a second diameter smaller than the first diameter, and a third raceway surface;
An annular third raceway surface facing the rolling elements in the row and having a third diameter smaller than the second diameter; and a fourth diameter smaller than the third diameter facing the rolling elements in the fourth row. And an annular fourth raceway surface.

The invention described in claim 4 is the first invention.
In the roll neck bearing device for a rolling mill, the rolling elements in the first row, the rolling elements in the second row, the rolling elements in the third row, and the fourth row are arranged from the roll side toward the driving means side. And the rolling elements in the first row are arranged in order.
The second row of rolling elements has a second diameter greater than the first diameter, and the third row of rolling elements has a second diameter.
A rolling element having a third diameter greater than the diameter, the fourth row of rolling elements having a fourth diameter greater than the third diameter, and a rolling element of each of the first, second, third, and fourth rows; The diameter of each raceway surface of the inner ring facing the inner ring is equal, and the first, second, third,
The diameter of each raceway surface of the outer race facing each rolling element in the fourth row is equalized.

[0010]

The roll neck bearing device for a rolling mill according to the first aspect of the present invention is mounted on a roll neck connecting the roll and the driving means, and supports the roll in a cantilever manner. When the rolling mill is driven and a load is applied to the rolling mill roll, the roll neck is bent. This deflection is greatest at the part closest to the roll.

In the bearing device of the present invention, since the radial gap of the rolling element on the roll side is made larger than the radial gap of the rolling element on the driving means side, even if the roll neck is bent, the rolling element in the row on the roll side can be formed. Load does not concentrate. Therefore, it is possible to prevent the rolling elements in the row on the roll side from being damaged early.

According to a second aspect of the present invention, the first roll side is provided.
The diameter of the raceway surface of the outer race portion is made larger than the diameter of the raceway surface of the second outer race portion on the driving means side, and the diameter of the rolling elements in the first row is smaller than the diameter of the rolling elements in the second row. And the third
The diameter of the rolling elements in the row was smaller than the diameter of the rolling elements in the fourth row. Therefore, the radial gap, which is the distance that the rolling element can move in the radial direction between the inner ring and the outer ring, is increased in four stages from the drive means side toward the roll side.
The radial gap of the rolling element is set so as to correspond to the deflection of the roll neck. Therefore, the load is prevented from being concentrated on the rolling elements in the row on the roll side, and the rolling elements in the row on the roll side are prevented from being damaged early.

According to a third aspect of the present invention, the first to fourth rolling elements have the same diameter, and the first and second rolling elements are arranged from the roll side to the driving means side. , The third,
First, second, third and fourth outer races facing the rolling elements in the fourth row
The diameter of the raceway was reduced in four steps in the order of first, second, third, and fourth. Therefore, the radial gap, which is the distance that the rolling element can move in the radial direction between the inner ring and the outer ring, is increased in four stages from the drive means side to the roll side, so that the roll neck can be bent. A radial gap between the rolling elements that is well suited is set. Therefore, the load is prevented from being concentrated on the rolling elements in the row on the roll side, and the rolling elements in the row on the roll side are prevented from being damaged early.

According to a fourth aspect of the present invention, the diameters of the raceway surfaces of the inner race and the outer race are made constant, and the first, second, and second arrangements are arranged in order from the roll side to the drive means side. The rolling elements in the third and fourth four rows are the first, second, third and fourth rolling elements.
, The diameter is increased in four stages. Therefore, the radial gap, which is the distance that the rolling element can move in the radial direction between the inner ring and the outer ring, is increased in four stages from the drive means side to the roll side, so that the roll neck can be bent. A radial gap between the rolling elements that is well suited is set.
Therefore, the load is prevented from being concentrated on the rolling elements in the row on the roll side, and the rolling elements in the row on the roll side are prevented from being damaged early.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

As shown in FIG. 2, the bearing device A of this embodiment is mounted on a roll neck 52 for connecting a roll 51 and a motor (not shown) so as to support the roll 51 in a cantilever manner. Has become. 53 is a support bearing for supporting the cantilever support of the roll neck bearing device A.

The roll neck bearing device A of this embodiment is
As shown in FIG. 1, there are four rows of rollers arranged between a cylindrical inner ring 1 and a cylindrical outer ring 2. The inner ring 1 is fitted and fixed to the roll neck 52 and rotates integrally with the roll neck 52. Each roller row has a plurality of cylindrical rollers arranged at predetermined intervals in the circumferential direction. Rollers 3 and 3 in the first row
The rollers 6 in the row have a first diameter D1, and the rollers 5 in the second row and the rollers 7 in the fourth row have a second diameter D2 larger by Δd than the first diameter D1. . Also, the inner ring 1
The outer peripheral surface 1S has a cylindrical shape with a constant value D0.

The outer ring 2 has a first outer ring portion 2a on the roll side.
And a second outer ring portion 2b on the motor side.

The first outer ring portion 2a sandwiches the first row of rollers 3 and the second row of rollers 5 between the inner ring 1 and the first outer ring portion 2a. The first outer ring portion 2a has an annular groove 11 fitted to the first row of rollers 3 and an annular groove 12 fitted to the second row of rollers 5. The first raceway diameter DS1 that is the diameter of the cylindrical first raceway surface 11S of the groove 11 is formed to be equal to the second raceway diameter DS2 that is the diameter of the cylindrical second raceway surface 12S of the groove 12. .

The second outer ring portion 2b is connected to the inner ring 1
, The third row of rollers 6 and the fourth row of rollers 7 are sandwiched. The second outer ring portion 2b has an annular groove 13 that fits into the third row of rollers 6 and an annular groove 14 that fits into the fourth row of rollers 7. The third track diameter DS3 which is the diameter of the cylindrical third track surface 13S of the groove 13 is:
The groove 14 is formed to have the same diameter as the fourth track diameter DS4 which is the diameter of the cylindrical fourth track surface 14S. Further, the third track diameter DS3 is formed smaller by 4Δd than the first track diameter DS1.

The rollers 3 and 5 are provided with opposing surfaces 3S and 5S which are axially opposed to each other, and formed with holes 3h and 5h extending in the axial direction. And this hole 3
The shaft 16 is clearance-fitted between h and 5h. The axis 16 is
Similarly to the rollers 3 and 5, the same number as the rollers 3 and 5 are arranged at predetermined intervals in the circumferential direction, and each shaft 16 has an inner ring 1 and an outer ring 2a at the center in the axial direction. Is rotatably attached to a ring-shaped disk 17 extending in the circumferential direction between the two. The shaft 16 and the disk 17 constitute a first retainer 31. In addition, the rollers 6 and 7 are
Holes 6h and 7h extending in the axial direction are formed in the facing surface 6S and the facing surface 7S that face each other in the axial direction. The shaft 18 is clearance-fitted in the holes 6h and 7h. As with the rollers 6 and 7, the same number of the rollers 18 as the rollers 6 and 7 are arranged at a predetermined interval in the circumferential direction. Ring-shaped disk 1 extending in the circumferential direction between outer ring 1 and outer ring 2b
9 to be rotatable. The shaft 18 and the disk 19 constitute a second retainer 32.

In the bearing device having the above-described configuration, the radial gap R1, which is the distance that the first row of rollers 3 can move in the radial direction, is expressed by the following equation (1).

R1 = (DS1−D0) −2 · D1 The second raceway surface 12S of the groove 12 and the outer peripheral surface 1S of the inner ring 1
The radial gap R2, which is the distance that the roller 5 disposed between the rollers 5 can move in the radial direction, is expressed by the following equation (2).

R2 = (DS2-D0) -2.D2 = (DS1-D0) -2. (D1 + .DELTA.d) = R1-2..DELTA.d Also, the third raceway surface 13S of the groove 13 and the outer peripheral surface 1S of the inner ring 1 are obtained.
The radial gap R3, which is a distance that the roller 6 disposed between the rollers 6 can move in the radial direction, is expressed by the following equation (3).

## EQU3 ## R3 = (DS3-D0) -2.D1 = (DS1-4.DELTA.d-D0) -2.D1 = (DS1-D0) -2. (D1 + 2.DELTA.d) = R1-4.DELTA.d Track surface 14S and outer peripheral surface 1S of inner ring 1
The radial gap R4, which is the distance that the roller 7 arranged between the rollers 7 can move in the radial direction, is expressed by the following equation (4).

## EQU4 ## R4 = (DS4-D0) -2.D2 = (DS3-D0) -2.D2 = (DS1-4.DELTA.d-D0) -2. (D1 + .DELTA.d) = (DS1-D0) -2. (D1 + 3.DELTA.d) ) = R1-6Δd

As is apparent from the above equations (1) to (4), in this bearing device, the radial gap increases by 2Δd from the fourth row of rollers 7 on the motor side to the first row of rollers 3 on the roll side. ing. Therefore, even if a load is applied to the roll of the rolling mill and the roll neck is bent in the radial direction, the load is concentrated on the rollers 3 and 5 in the row on the roll side because the radial gap is larger as the roller is closer to the roll. Can be prevented.
Therefore, it is possible to prevent the rollers 3 and 5 in the row on the roll side from being damaged early.

In this embodiment, a first retainer 31 for holding the first row of rollers 3 and a second row of rollers 5 and a second holder for holding the third row of rollers 6 and the fourth row of rollers 7 are provided. Since the two retainers 32 are separated, the rollers between the first and second rows of rollers 3 and 5 and the third and fourth rows of rollers 6 and 7 advance and delay. Also, the cage is not damaged. In the above embodiment, the diameters of the rollers in the first and third rows are set to a small diameter D1, the diameters of the rollers in the second and fourth rows are set to a large diameter D2, and the first and third rows are set to a large diameter D2.
By increasing the diameter of the second raceway surface and increasing the diameter of the third and fourth raceway surfaces, the radial gap of the rollers was increased in four stages from the motor side toward the roll side. 3
As shown in the figure, the diameters of the four rows of rollers 3, 5, 6, 7 are set equal, and the fourth, third, second, and first raceway surfaces 14S, 13S, 1
The diameter of the raceway surface may be increased in four stages in the order of 2S and 11S, and the radial gap of the rollers may be increased in four stages from the motor side toward the roll side. Also, as shown in FIG. 4, the diameters of the first to fourth raceway surfaces 11S to 14S are set to be equal, and the rollers 3, 5, 6, and 7 in the first, second, third, and fourth rows are arranged in this order. The diameter of the roller may be increased in four stages, and the radial gap of the roller may be increased in four stages from the motor side toward the roll side.

However, the radial gap of the roller, which is a minute dimension, can be changed by only setting the dimension of the raceway surface as shown in FIG. 3 or only by setting the dimension of the roller as shown in FIG.
Rather than setting the number of steps, as in the above-described embodiment shown in FIG. 1, the two-step dimension setting of the raceway surface and the two-step dimension setting of the rollers are combined to set the radial gap of the rollers in four steps. Since the fine processing stage can be reduced to half,
Parts processing becomes easy. That is, in the above embodiment, the first
Since the raceway surface 11S and the second raceway surface 12S can be simultaneously polished, and the third raceway surface 13S and the fourth raceway surface 14S can be simultaneously polished, the number of processing steps can be reduced.
Further, in the above embodiment, the diameter of the raceway surface of the outer ring is set to two levels, but the diameter of the raceway surface of the inner ring may be set to two levels while keeping the diameter of the raceway surface of the outer ring constant.

[0026]

As is apparent from the above, in the bearing device of the first aspect of the present invention, the radial gap in the rolling element on the roll side is made larger than the radial gap in the rolling element on the driving means side. Even if it bends, the load does not concentrate on the rolling elements in the row on the roll side. Therefore, it is possible to prevent the rolling elements in the row on the roll side from being damaged early. Further, in the invention according to claim 2, the diameter of the raceway surface of the first outer race portion on the roll side is made larger than the diameter of the raceway surface of the second outer race portion on the drive means side, and the rolling of the first row is performed. The diameter of the moving body was smaller than the diameter of the rolling elements in the second row, and the diameter of the rolling elements in the third row was smaller than the diameter of the rolling elements in the fourth row. Therefore, the radial gap, which is the distance that the rolling element can move in the radial direction between the inner ring and the outer ring, is increased in four stages from the drive means side to the roll side, so that the roll neck can be bent. It is possible to set a radial gap between the rolling elements that is well suited. Therefore, the load can be prevented from being concentrated on the rolling elements in the row on the roll side, and the rolling elements in the row on the roll side can be prevented from being damaged early.
According to the third aspect of the present invention, the first to fourth rows of rolling elements are set to have the same diameter, and the first, second, and second rolling elements are arranged from the roll side to the driving means side. The diameters of the first, second, third, and fourth raceway surfaces of the outer ring facing the rolling elements in the third and fourth rows are reduced in four stages in the order of first, second, third, and fourth. . Therefore, the radial gap, which is the distance that the rolling element can move in the radial direction between the inner ring and the outer ring, is increased in four stages from the drive means side toward the roll side.
It is possible to set a radial gap of the rolling element that can well cope with the bending of the roll neck. Therefore, the load can be prevented from being concentrated on the rolling elements in the row on the roll side, and the rolling elements in the row on the roll side can be prevented from being damaged early. Further, the invention according to claim 4 is that the diameters of the raceway surfaces of the inner ring and the outer ring are fixed, and the first, second, third, and the like are arranged in order from the roll side to the drive means side. The diameter of the rolling elements in the fourth four rows is increased in four stages in the order of first, second, third, and fourth. Therefore, the radial gap, which is the distance that the rolling element can move in the radial direction between the inner ring and the outer ring, is increased in four stages from the drive means side to the roll side, so that the roll neck can be bent. It is possible to set a radial gap between the rolling elements that is well suited. Therefore, the load can be prevented from being concentrated on the rolling elements in the row on the roll side, and the rollers in the row on the roll side can be prevented from being damaged early.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of an embodiment of a roll neck bearing device for a rolling mill of the present invention.

FIG. 2 is an assembled view of a rolling mill according to the embodiment, which is incorporated into a roll neck.

FIG. 3 is a sectional view of a main part of a modified example of the embodiment.

FIG. 4 is a sectional view of a main part of another modified example of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Inner ring, 2 ... Outer ring, 2a ... 1st outer ring part, 2b ... 2nd outer ring part, 3 ... Roller of 1st row, 5 ... Roller of 2nd row, 6 ... 3rd
Rollers in a row, 7 ... Rollers in a fourth row, 11, 12, 13, 14
... groove, 11S ... first track surface, 12S ... second track surface, 13
S: third track surface, 14S: fourth track surface, 51: roll,
52: Roll neck, A: Roll neck bearing device, 1S
... Outer peripheral surface of inner ring, D0... Diameter of outer peripheral surface 1S, D1.
Diameter of rollers in rows and third row, D2 ... second and fourth rows
The diameter of a row of rollers, DS1... The diameter of the first raceway surface 11S, D
S2: diameter of the second raceway surface 12S, DS3: third raceway surface 1
3S diameter, DS4... Diameter of fourth track surface 14S.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-256022 (JP, A) JP-A-2-46904 (JP, A) JP-A-47-16363 (JP, A) 196301 (JP, U) Japanese Utility Model Showa 47-19645 (JP, U) Japanese Utility Model Showa 62-123303 (JP, U) Japanese Utility Model 1-33203 (JP, Y2) Japanese Utility Model 46-13845 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 31/07 F16C 19/28 B21B 13/00

Claims (4)

(57) [Claims] 1. A roll neck bearing device for a rolling mill having a double row of rolling elements between an inner ring and an outer ring, mounted on a roll neck connecting a roll and a driving means, and supporting the roll in a cantilever manner. The value obtained by subtracting the diameter of the roll-side raceway surface of the inner race and twice the diameter of the rolling-body of the roll-side row from the diameter of the roll-side raceway surface of the outer ring facing the rolling elements of the roll-side row. The diameter of a certain rolling-side rolling element radial direction gap is changed from the diameter of the driving means-side raceway surface of the outer ring facing the rolling elements of the driving-side row to the diameter of the inner-wheel driving means-side raceway and the rolling of the driving means-side row. A roll neck bearing device for a rolling mill, characterized in that the diameter is larger than a radial gap in the driving means side rolling element, which is a value obtained by subtracting twice the diameter of the moving element. 2. The roll neck bearing device for a rolling mill according to claim 1, wherein the first row of rolling elements, the second row of rolling elements, and the third row of rolling elements are arranged from the roll side to the drive means side. Row of rolling elements, 4th
The rolling elements in the first row and the rolling elements in the third row have a first diameter, and the rolling elements in the second row and the fourth row are arranged in order. The moving body has a second diameter larger than the first diameter, and the diameter of each raceway surface of the inner ring facing each of the rolling elements in the first, second, third, and fourth rows is equal; The first row of rolling elements and the second row of rolling elements are sandwiched between the inner ring and the inner race, and the diameter of the first raceway surface facing the first row of rolling elements is the second row of rolling elements. The third row of rolling elements and the fourth row of rolling elements are sandwiched between a first outer ring portion having a diameter equal to the diameter of a second raceway surface facing the moving body and the inner ring. The diameter of the third facing raceway surface is equal to the diameter of the fourth raceway surface facing the fourth row of rolling elements, and the diameters of the third and fourth raceway surfaces are the first and second raceways of the first outer race. Yo Rolling mills, characterized by comprising a second outer portion smaller than the diameter of the second raceway surface roll neck bearing device. 3. The roll neck bearing device for a rolling mill according to claim 1, wherein the first row of rolling elements, the second row of rolling elements, and the third row of rolling elements are arranged from the roll side toward the driving means side. Row of rolling elements, 4th
The rolling elements of the row are arranged in order. The diameters of the rolling elements of the four rows are equal, and the diameter of each raceway surface of the inner race facing the rolling elements of the first, second, third, and fourth rows. The outer ring is opposed to the first row of rolling elements, and has an annular first raceway surface having a first diameter, and the second outer face is opposed to the second row of rolling elements and is smaller than the first diameter. A second annular raceway surface having a diameter, a third annular raceway surface facing the third row of rolling elements and having a third diameter smaller than the second diameter, and a fourth row of rolling elements. And a fourth annular raceway surface having a fourth diameter smaller than the third diameter and opposed to the third diameter. 4. The roll neck bearing device for a rolling mill according to claim 1, wherein the first row of rolling elements, the second row of rolling elements, and the third row of rolling elements are arranged from the roll side to the drive means side. Row of rolling elements, 4th
The rolling elements of the first row have a first diameter; the rolling elements of the second row have a second diameter larger than the first diameter; The three rows of rolling elements have a third diameter greater than the second diameter, the fourth row of rolling elements have a fourth diameter greater than the third diameter, the first, second, and The diameter of each raceway surface of the inner ring facing each rolling element in the third and fourth rows is equal, and the first, second, and
A roll neck bearing device for a rolling mill, wherein the diameter of each raceway surface of the outer ring facing each of the rolling elements in the third and fourth rows is equalized.