JPH069687B2 - Multi-stage rolling mill - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a multi-stage rolling mill having small-diameter rolling rolls.

[Background of the Invention]

2. Description of the Related Art In recent years, rolling mills are extremely required to save energy in rolling of rolled products, particularly sheet materials, to reduce edge drop, and to perform good rolling of wide and thin material and high hardness material.
In order to satisfy such requirements, it is necessary to make the work roll as small as possible. For the purpose of simply reducing the diameter of the work roll, the roll arrangement should be 12 or 20 as in the multi-high rolling mill (Sendimia rolling mill) disclosed in JP-A-294761. Can be realized by However, as is well known, these multi-high rolling mills
Since the plate shape is controlled by a geometrical method using a split eccentric roll, a complicated control technique is required. Moreover, since the work roll is not provided with a bending device, it is difficult to control the shape, and the rolling mill has a complicated structure, which makes it difficult to operate and maintain.

On the other hand, in a 6-high rolling mill with a pair of latest small-diameter work rolls and a pair of intermediate rolls between a pair of reinforcing rolls, the axial movement of the intermediate rolls and the combined use of intermediate roll dending and work roll bending are performed. On the other hand, a rolling mill has been realized which performs good rolling using a small-diameter work roll (JP-A-56-66307). This JP-A-56-6
The rolling mill described in Japanese Patent No. 6307 is configured to use a work roll having a diameter of 25% or less of the maximum plate width of the material to be rolled. However, when the work roll becomes extremely small,
It becomes extremely difficult to support the work rolls from the aspect of the space between the rolls by the bearing box and perform the work roll bending through the bearing box. That is, when the diameter of the work roll becomes a small diameter of, for example, about 10% of the maximum plate width, horizontal bending due to the driving torque to the work roll occurs.
Therefore, it is necessary to provide a holding roll adjacent to the horizontal position of the work roll separately from the intermediate roll to suppress the horizontal bending of the work roll. However, when the work rolls are recombined, it is necessary to take out the work rolls from the housing of the rolling mill together with the bearing box inserted at the end portions of the rolls. Therefore, the holding roll that prevents the work roll from bending in the horizontal direction becomes an obstacle when pulling out the bearing box on the drive side, and the work roll cannot be recombined unless the holding roll is a movable mechanism. Occurs. Therefore, in a rolling mill having a work roll having a small diameter, a means for leaving the bearing box in the housing or removing the bearing box from the work roll before pulling out the work roll from the housing is required.

By the way, when the work roll has a smaller diameter, the axial distance between the upper and lower work rolls is small, and therefore, as shown in JP-B-41-14974 or JP-B-46-6176, a sliding bearing is used as a bearing, or the work is performed. For rolls that rotate at high speed, thin roller bearings with a relatively large load capacity are used. The needle roller bearing has a drawback that it is weak against an unbalanced load because the roller has an elongated shape. Therefore, in rolling mills with small diameter work rolls, the radial force used for the work rolls and the roll bending force cause a large inclination due to the bending of the roll neck, and the conventional bearing box can sufficiently follow this bending. Because it is not possible, it often damages axial life. To prevent the bearing from being damaged, enormous energy is required when the bearing box is made to follow the inclination of the roll neck.

On the other hand, there are rolling mills that use sliding bearings, in which the bearing is left on the work roll side and the work roll is replaced by integrating it with the roll. There was a drawback that it was not easy.

The actual core roll 1 is included in Japanese Utility Model No. 59-110126.
And a lower pressure roll 2 in the roll forming machine configured to separately support the rolls and replace the rolls by bearing the rolls separately.
Below the roll bearing support part, the main shaft 6 is attached to the pressure roll 2 by a vertical slide table 5 which is supported by the pressure roller to move the core roll 1 toward the mandrel roll 1.
Mounted in parallel with the shaft 4 of the pressure roll 2
Discloses a roll forming machine configured to be transmitted by gears 7 and 8. However, the removal of the pressure roll in this apparatus is a method of taking out the bearings at both ends of the pressure roll upward while the bearings are mounted on the roll, and it is difficult to apply the multi-stage rolling mill.

[Object of the Invention]

It is an object of the present invention to provide a multi-stage rolling mill that can easily perform roll reassembling work in a rolling mill equipped with small-diameter work rolls.

[Outline of Invention]

According to the present invention, a bearing box rotatably supporting a work roll is detachably and rotatably supported by a rotating door rotatably provided in a housing, and the rotating door is horizontally rotated. In addition, the bearing box moves integrally with the rotary door so that the work roll can be removed from the bearing box while tilting in the horizontal direction, so that the work rolls can be easily recombined.

Example of Invention

Hereinafter, preferred embodiments of the multi-high rolling mill according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view of an embodiment of a multi-high rolling mill according to the present invention. In FIG. 1, the central portion of the housing 10 is
An upper work roll 12 and a lower work roll 14 are arranged. These upper and lower work rolls 12 and 14 are rotatably supported by upper and lower work roll bearing boxes 13 and 15 whose details will be described later, and the work roll bearing boxes are rotatable doors 16 and 1.
8 is rotatably held. The swivel doors 16 and 18 are
One end is rotatably attached to the support member 24 via the fulcrum pins 20 and 22, and can be rotated along the housing 10, that is, orthogonal to the axes of the upper and lower work rolls 12 and 14. . Further, the support member 24 has a pin 26.
It is pivotally attached to a fixing member 28 fixed to the housing 10 via. Therefore, the rotary doors 16 and 18 can rotate about the pin 26 outside the side of the housing 10, that is, at right angles to the paper surface.

The other ends of the rotary doors 16 and 18 are engaged with a keeper plate 30 which is a locking member. Keeper plate 30
Has a long hole 32 formed therein, and is fixed to the housing 10 by a bolt 34 inserted into the long hole 32, and the bolt 34 is loosened, so that the housing 1
It is possible to move along 0, and the locking of the rotary doors 16 and 18 can be released. A hydraulic cylinder 36 for bending is fixed to the rotary door 18, and a piston 38 of the hydraulic cylinder 36 for bending is inserted into an engagement groove 40 formed in the rotary door 16.

Outside the upper work roll 12 and the lower work roll 14, an upper intermediate roll 42 and a lower intermediate roll 44 are arranged in contact with the upper work roll 12 and the lower work roll 14. The upper intermediate roll 42 and the lower intermediate roll 44 are pivotally supported by an upper intermediate roll bearing box 46 and a lower intermediate roll bearing box 48,
As described in JP-A-56-66307, the project block 50 provided on the housing 10 and the upper and lower intermediate roll bearing boxes 4 can be axially shifted.
Bending force is received by a bending hydraulic cylinder 52 disposed between the hydraulic cylinders 6 and 48.

Outside the upper and lower intermediate rolls 42, 44, an upper reinforcing roll 54 and a lower reinforcing roll 56 are arranged in contact with them. The upper reinforcing roll 54 and the lower reinforcing roll 56 are pivotally supported by an upper reinforcing roll bearing box 58 and a lower reinforcing roll bearing box 60. Between the upper reinforcing roll bearing box 58 and the upper intermediate roll bearing box 46, and between the chemical reinforcing roll bearing box 60 and the lower intermediate roll bearing box 48, bending hydraulic cylinders 62 are arranged, respectively. Upper and lower intermediate rolls 42,
The bending force applied to the 44 can be adjusted. The upper reinforcing roll bearing box 58 is supported by a balance cylinder 64 provided in the project block 50, and directly receives a reduction force by a reduction device (not shown).

Since the diameters of the upper and lower work rolls 12 and 14 are generally about 10% of the maximum plate width, the upper work rolls 12 and 14 are located laterally of the upper work roll 12 and the lower work roll 14, that is, in the sheet passing direction of the rolled material. Support rolls 66, 68, 70, 72, 74, 7 for suppressing the horizontal deflection between the lower work roll 12 and the lower work roll 14.
6, 80, 82, 84, 86, 88, 90 are arranged. These holding rolls have a larger diameter as they move away from the work roll.

As shown in FIG. 2, the center of each rotary door is inserted into the opening 92 of the housing 10 using the rotary door 18 as an example. The lower work all-bearing box 15 that rotatably supports the lower work roll 14 has a spherical outer peripheral surface, and has a spherical surface that is substantially the same as the outer peripheral surface of the lower work roll bearing box 15 provided on the rotating door 18. It is fitted in the fitting portion 94 that it has. The lower work roll bearing box 15 accommodates a radial bearing 96 that supports a radial load that acts in the radial direction of the lower work roll 14 and a thrust bearing 98 that supports an axial load of the lower work roll. The drive side of the housing 10 (second
A rotary door 18a similar to that on the operating side (lower side in FIG. 2) is also provided on the upper side in the figure. Further, on the operation side in the housing 10, a roll receiver 118 is arranged corresponding to each work roll. A rear end of the roll receiver 118 is connected to the cylinder 120 and is guided by a guide 122 so that the receiving portion 124 can move back and forth.

Each of the support rolls for suppressing the horizontal bending of the upper work roll 12 and the lower work roll 14 is three rolls arranged on one side of the work roll (work rolls 80, 84, 88 in FIG. 2).
3 and the support rolls 82, 86, 90) form a set, and are rotatably supported by the frames 100, 102. The frames 100 and 102 have sliding guides 104, which are fixed to the housing 10 as shown in FIG.
The pressing cylinder 1 is fitted in the guide groove 108 of the pressing cylinder 1.
With 10, the work rolls can be moved back and forth. Therefore, each holding roll is connected to the frame 100, 1
02, and when the work rolls are changed, the rolled material 112 is retracted obliquely in the vertical direction. As shown in FIG. 4 as an example of the lower work roll bearing box 15, each work roll bearing box is formed with radial oil holes 114 so that lubricating oil can be supplied to the central portion of the lower work roll bearing box 15. I'm running. As shown in FIG. 4, the fitting portion 94 is composed of the main body of the rotary door 18 and the pressing member 116. By removing the pressing member 116, the lower work roll bearing box 15 can be attached and detached. . Then, the lower work roll bearing box fitted to the fitting portion 94 and the lower work roll bearing box are fitted to the fitting portion 9
It is held in the fitting portion 94 by the spherical surface with 4.

In the embodiment configured as described above, the rotary doors 16 and 18 are moved by the bending hydraulic cylinder 36 in the direction to open the gap when the rolled material 112 is passed. That is, when the bending hydraulic cylinder 36 is operated, the rotary door 16 rotates counterclockwise about the fulcrum pin 20 in FIG. 1, and the rotary door 18 rotates clockwise about the fulcrum pin 22. Rotate. At this time, the fulcrum pin 20 is arranged on the same horizontal plane as the shaft of the upper work roll 12,
When 2 is arranged on the same horizontal plane as the axis of the lower work roll 14, the vertical movement amount of the revolving doors 16 and 18 is
The amount of change in the horizontal direction is extremely small. For example, assuming that the distance between the fulcrum pin and the axis of the work roll is 500 mm, the amount of change in the horizontal direction is 4 μm even if the upper and lower work rolls 12 and 14 move up and down by 2 mm. Since it is smaller than the clearance of the bearing, there is no practical problem.

The bending force is applied to the upper and lower work rolls 12 and 14 by adjusting the hydraulic pressure of the bending hydraulic cylinder 36. Then, when the bending hydraulic cylinder 36 is operated, the rotary doors 16 and 18 rotate in a direction of widening or narrowing the mutual space. When bending force is applied to the upper and lower work rolls 12 and 14,
The end of each work roll bends. For example, the rotating doors 16 and 18
When a bending force is applied in such a direction that the intervals between the work rolls are widened, that is, the upper work roll 12 is convex downward and the lower work roll 14 is convex upward, the ends of the respective work rolls are bent, As shown in FIG. 5, the bearing box of each work roll inclines according to the amount of bending. For this reason, the end of each work roll is kept coaxial with the bearing box, and the radial bearing 9
The load applied to 6 becomes a uniform load in the axial direction. Therefore,
Even if the radial bearing 96 is a needle roller bearing, it is hardly damaged and can be stably operated for a long time.

When changing the work rolls, the work rolls are changed as follows.

First, the balance cylinder 64 is actuated to move upward through the upper reinforcing roll bearing box 58, and the upper intermediate roll 4
2 is moved up following this, and a gap is provided between the upper intermediate roll 42 and the upper work roll 12. Next, by lowering the hydraulic jack for reduction (not shown), the lower reinforcing roll 56 and the lower intermediate roll 44 are lowered following this, and a gap is provided between the lower intermediate roll 44 and the lower work roll 14. . Furthermore, the pressing cylinder 110 shown in FIG.
Is operated to move the frames 100 and 102 to the sliding guide 10
Retaining rolls 66, 68, 70, 7 that retreat along 8 to prevent horizontal deflection of the upper and lower work rolls 12, 14.
2,74,76,80,82,84,86,88,90
Is moved to both sides of the upper and lower work rolls 12 and 14 to provide a gap required for recomposition.

Next, the bolts 34 fixing the keeper plate 30 provided on the operating side of the housing 10 are loosened, the keeper plate 30 is moved to the right in FIG. Disengage. Then, while rotating the rotary doors 16 and 18 as shown in FIG. 6, the cylinder 120 is operated to advance the roll receiver 118, and the receiving portion 124 is arranged at a predetermined position. As shown by taking the turning door 18 as an example, as the turning door 18 is turned to the outside of the housing 10, the lower work roll 14 is gradually inclined in the horizontal direction, and the lower work roll bearing boxes 15 and 15a are rotated. It rotates within the fitting portion 94 of the moving door 18. When the lower work roll bearing box 15 rotates to the angle θ, the lower work roll 14
Is detached from the lower work roll bearing box 15 and mounted on the receiving portion 124 of the roll receiver 118. After that, swivel door 1
8 is opened as shown by the chain double-dashed line, and the work roll is pulled out from the inside of the housing 10. At this time, the swing door 18 is
The lower end of the fulcrum pin 22 side is supported by the support member 24, and the lower end of the support member 24 is supported by the fixing member 28. Incidentally, the work roll can be pulled out from the housing by using a rearrangement jig such as a boat bar, so that the rearrangement work can be easily performed. At this time, when the work roll is lightweight, the reassembling work may be performed manually.

In the above embodiment, the roll receiver 118 is the cylinder 12
The case where the roll receiver 118 is configured to be able to move forward and backward by 0 has been described, but the roll receiver 118 may be fixed and arranged at a predetermined position. Further, in the above-described embodiment, the case where a part of the outer surface of the work roll bearing box is formed into a spherical shape has been described, but the work roll bearing box may be formed into a spherical shape.

〔The invention's effect〕

As described above, according to the present invention, the bearing box is attached to the rotary door, and the bearing box is automatically pulled out from the work roll by rotating and opening the rotary door. The roll changing operation of the rolling mill having the rolls can be easily performed.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a multi-high rolling mill according to the present invention, FIG. 2 is a plan view of a lower work roll portion of the embodiment, and FIG. 3 is a mounting state of support rolls arranged on both sides of the work roll. 4 is a cross-sectional view of the work roll bearing box of the embodiment, FIG. 5 is a cross-sectional view showing a state of the work roll bearing box when a bending force is applied to the work roll of the embodiment, FIG. 6 is an explanatory view of the work under the work roll assembly of the above-mentioned embodiment. 10 ... Housing, 12 ... Upper work roll, 14 ... Lower work roll, 16, 18, 18a ... Revolving door, 20, 22 ... Support pin, 24 ... Support member, 26 ... Pin, 28 ... Fixing member, 30 ... Keeper Plate, 36, 52, 62 ... hydraulic cylinder for bending, 42 ... upper intermediate roll, 44 ...
Lower intermediate roll, 54 ... Upper reinforcing roll, 56 ... Lower reinforcing roll, 94 ... Fitting part, 118 ... Roll receiver, 120 ... Cylinder.

Claims (5)

[Claims] 1. A pair of upper and lower work rolls rotatably supported in a housing through a bearing box, a rotatable intermediate roll provided in contact with the outside of the work roll, and an outside of the intermediate roll in contact with the rotatable roll. In a multi-stage rolling mill having a rotatable reinforcing roll provided on the bearing box, the work roll is detachably supported on the bearing box, the bearing box is rotatably held, and one end is rotated on the housing. A multi-stage rolling mill comprising: a rotatable door that is freely coupled and horizontally rotatable; and a locking member that is provided in the housing and that locks the rotatable door in a closed state. 2. The bearing box has an outer surface formed into a spherical surface, and the rotary door has a fitting portion having a spherical surface substantially equal to the outer surface of the bearing box, and the bearing box is fitted into the fitting portion. The multistage rolling mill according to claim 1, characterized in that 3. The housing supports one end of the rotating door so as to be horizontally rotatable, and is also supported so as to be rotatable in a direction orthogonal to an axis of the work roll, and The other ends of the pair of upper and lower rotating doors that rotatably hold the bearing boxes of the working rows of
The multi-high rolling mill according to claim 1 or 2, wherein the multi-stage rolling mill is connected by a bending cylinder. 4. The housing includes a roll receiver for supporting a shaft end portion of the work roll when the rotary door provided on the operation side inside the operation side is horizontally rotated, and the roll receiver. The multistage rolling mill according to any one of claims 1 to 3, further comprising a cylinder for advancing and retreating. 5. A center of rotation for rotating each of the rotating doors in a direction orthogonal to a work roll is on the same horizontal plane as the axis of the corresponding front work roll. Item or the multi-stage rolling mill according to Item 4.