JP3289322B2 - Roll bearing device - 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 bearing device used in a rolling mill or the like in which a thrust force largely acts on a roll such as a rolling mill in which rolls are arranged crosswise in a horizontal plane parallel to a plate material to roll the plate material. It is about.

[0002]

2. Description of the Related Art In recent years, the requirements for the thickness accuracy of a rolled product in the sheet width direction have become increasingly severe. Generally, a hot coil has an intermediate height in the plate width direction. To correct the thickness distribution so as to cancel this, a method of attaching an initial crown to the work roll in advance, or a method of bending the work roll is used. It has been known.

However, in the case of a method of attaching a crown to a work roll, a number of rolls corresponding to a rolling condition such as a plate width and a thickness of a plate material are held, and a different crown is set every time the rolling condition changes. The work roll has to be replaced, and this causes a problem of lowering the operation rate. On the other hand, in the case of bending the work roll, the work roll may be added to the work roll due to the strength of the roll neck. Since the bending force is limited, there is a problem that a sufficient ability to correct the thickness distribution in the plate width direction cannot be obtained.

In order to solve these problems, as shown in an example in FIG. 3, the upper work roll 1 and the upper backup roll 3 and the lower work roll 2 and the lower backup roll 4 are kept parallel to each other while keeping their axes horizontal. A roll-cross type rolling mill has been developed in which the upper and lower pair rolls are arranged to form a plate pair 5 and the plate 5 is rolled in a state where the axes of the upper and lower pair rolls intersect in a horizontal plane (Japanese Patent Laid-Open Publication No. H11-163873). No. 55-64908). In this rolling mill, the thickness distribution in the width direction of the plate material 5 can be controlled by adjusting the crossing angle (cross angle) of the upper and lower pair rolls, so that a product having a uniform thickness can be rolled. However, since rolling is performed with the roll tilted in a horizontal plane, there is a problem that an excessive thrust force is generated in the roll.

Therefore, in a conventional rolling mill in which a thrust force is generated in a work roll such as the above-mentioned roll-cross type rolling mill, as shown in FIG. A radial bearing 6 that supports the rotation of the roll and a thrust bearing 7 that receives a thrust force are mounted on the roll shaft 1a in the axial direction. The shaft 1a is supported.
255207).

[0006]

However, as described above, the structure in which the radial bearing 6 and the thrust bearing 7 are simply incorporated in the axle box 8 has a problem in that the load capacity with respect to the thrust force is low. That is, it has been confirmed that a thrust force of about 10% of the rolling load acts on the work roll in the above-mentioned roll-cross type rolling mill, and since this excessive thrust force acts on the thrust bearing 7, wear and the like are caused. As a result, the life of the thrust bearing 7 is very short, and therefore, the frequency of replacement of the thrust bearing 7 increases, and the maintenance management is difficult.

Therefore, the present invention is not limited to the above-mentioned roll-cloth type rolling mill, but is easy to maintain in a rolling mill in which a large thrust force is generated in a roll, and is applicable to a large thrust force acting on the roll. It is an object of the present invention to provide a roll bearing device that can withstand.

[0008]

According to the present invention, there is provided a roll bearing in which a radial bearing housed in a shaft box is mounted on a roll shaft to support the rotation of the roll. In the apparatus, at a position on the same roll shaft adjacent to the radial bearing on the roll shaft on one end side of the roll, a piston having an outer diameter large enough to inscribe the inner surface of the axle box is rotated integrally with the roll shaft. A pressure chamber is formed in the axle box and is provided in the axle box, and is adapted to supply fluid to each pressure chamber on both sides of the piston. A fluid introduction path is provided in each of the axle boxes, and a fluid constant-rate feeding device configured to supply a constant amount of fluid is connected to each of the fluid introduction paths. Further, the piston in the axle box is in a neutral position. Axle box at the position In communication with both the pressure chamber piston is configured in which a fluid discharge path so as to discharge the fluid from one pressure chamber portion or according to the position to move to the roll axial direction to the outside.

[0009]

[0010]

[0011]

When a thrust force acts on the roll, the thrust force can be received by the piston and the pressure chamber portion whose fluid pressure has been increased by the movement of the piston. Therefore, even if the thrust force acts in any direction of the roll axis, it can be dealt with on one end side of the roll.

[0012]

[0013]

[0014]

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

FIG. 1 shows an example of a basic configuration which is a premise of one embodiment of the present invention. For convenience of explanation, only one end of an upper work roll 1 among upper and lower work rolls is shown. That is, as shown in FIG. 5, a radial bearing 6 housed in an axle box 8 is mounted on the roll shaft 1a of the upper work roll 1 to rotatably support the upper work roll 1. In the bearing device, a piston 9 is protruded at an adjacent position on the roll shaft 1a outside the radial bearing 6 to rotate coaxially and integrally with the roll shaft 1a,
The piston 9 is slidably fitted to the inner peripheral surface of the shaft box 8 in the axial direction of the roll via a sealing material 10, and is further inserted into the shaft box 8 with respect to the outer surface of the piston 9. Pipe 2
The pressure chamber 11 is formed so as to apply a pressure of a fluid such as a hydraulic pressure supplied through the pressure chamber 5 so that a thrust force acting on the upper work roll 1 in the direction of arrow A can be received by the fluid pressure of the pressure chamber 11. At the same time, the position of the upper work roll 1 in the roll axis direction is controlled by the position control device 12.

The position control device 12 includes a servo valve 1 serving as a flow control valve for controlling a supply amount of a fluid to the pressure chamber 11.
3, a displacement gauge 14 attached between the end of the roll shaft 1a and the end of the shaft box 8 to detect the relative displacement of the roll shaft 1a and the shaft box 8 in the roll axis direction. Displacement gauge 14
And a servo amplifier 16 as a controller that sends a control command to the servo valve 13 by comparing the value of the detection signal from the controller with the position set value by the setter 15. The displacement meter 14 may be of a type such as a gap sensor.

In the drawing, reference numeral 17 denotes a closing member attached to the outer end of the axle box 8 for forming the pressure chamber 11, reference numeral 18 denotes a sealing material provided on an inner peripheral portion of the closing member 17, and reference numeral 19 denotes a pressure chamber.
A pump for supplying fluid to the pump, and 20 indicates a tank for fluid.

For example, when the upper and lower work rolls are arranged crosswise as shown in FIG. 3 and horizontal cross rolling is performed, a large thrust force in the direction of arrow A acts on the upper work roll 1. The force can be received in a pressure chamber 11 formed in the axle box 8. That is,
Since the pressure of the fluid introduced into the pressure chamber 11 acts on the outer surface of the piston 9 protruding from the roll shaft 1a, the piston 9 and the pressure chamber 11 function as a thrust bearing. A large thrust force can be received. At this time, if the upper work roll 1 is displaced in the roll axis direction due to the thrust force in the direction of the arrow A,
The relative position between the roll shaft 1a and the shaft box 8 is detected by a displacement meter 14 attached between the end of the roll shaft 1a and the end of the shaft box 8, and the value of the detected signal and the position set value by the setting unit 15 are servo-controlled. The comparison operation is performed by the amplifier 16 and the servo amplifier 1
By sending a control command from 6 to the servo valve 13, the supply amount of fluid to the pressure chamber 11 is controlled, so that the upper work roll 1 is returned to the original regular position, and the displacement is prevented.

In the above description, since the piston 9 and the pressure chamber 11 functioning as a thrust bearing have a structure like a so-called fluid pressure cylinder, the thrust bearing 7 shown in FIG.
Since maintenance is not required due to short durability as in the case of using a bearing, and since the bearing is coaxial with the radial bearing 6 and uses fluid pressure, a large thrust force can be received with a compact structure. . Also, the piston 9
Is rotated integrally with the roll shaft 1a, which is advantageous in maintaining the roll axis when the upper work roll 1 rotates.

Next, FIG. 2 shows a specific embodiment of the present invention, which is an extension of the basic configuration example shown in FIG. 1. Similar to the basic configuration example shown in FIG. Is rotatably supported by a radial bearing 6 housed in an axle box 8, and the same roll adjacent to the radial bearing 6 on the roll shaft 1a at one end of the roll 1. Roll shaft 1 is located at an outer position on shaft 1a.
The pressure chamber 21 is formed by the partition wall 8a and the closing member 17 so as to be partitioned into two inner and outer pressure chamber portions 21a and 21b by the piston 9 projecting so as to rotate integrally with the pressure chamber 21a. Fluid introduction paths 22a and 22b for introducing a fluid into the chambers 21a and 21b are provided in the shaft box 8, and the respective fluid introduction paths 22a and 22b are provided.
In addition, for example, fluid metering and feeding devices 23a and 23b such as flow control valves, orifices, and capillaries are connected to a pipe 25.
a, 25b, and connected to each of the fluid metering and feeding devices 2
3a, 23b, through the pipes 25a, 25b and the fluid introduction paths 22a, 22b, the inner and outer pressure chambers 21a,
21b so that a constant amount of fluid can be supplied to the shaft box 8. Further, one of the pressure chamber portions is disposed at a position facing the neutral position of the piston 9 of the shaft box 8 in accordance with the moving position of the piston 9 in the roll axis direction. A fluid discharge passage 24 for discharging a fluid from inside 21a or 21b to the outside is provided.

In the case of the embodiment shown in FIG. 2, when no thrust force is acting on the upper work roll 1, the fluid is supplied to the fluid introduction passages 22a, 22b by the fluid constant-rate feeding devices 23a, 23b.
2b, each pressure chamber part 21a of the pressure chamber 21
After being constantly fed into the inside 21b, the state of being discharged from the fluid discharge path 24 and returned to the tank 20 is maintained. In this state, for example, when the piston 9 moves to the position indicated by the two-dot chain line due to the application of the thrust force in the direction of arrow A, the movement of the piston 9 closes the pressure chamber portion 21b. The fluid in the pressure chamber 21b is discharged from the fluid discharge passage 24 as indicated by a two-dot chain line arrow.
The thrust force in the direction of arrow A can be received by increasing the fluid pressure in the inside. On the other hand, upper work roll 1
When the thrust force acts in the direction indicated by the arrow A, the fluid pressure in the pressure chamber 21a of the pressure chamber 21 is increased, thereby receiving the thrust force in the direction indicated by the arrow A. Therefore, the pressure chamber 21a of the pressure chamber 21
The piston 9 and the pressure chamber 21a or 21b in which the fluid pressure is increased can function as a thrust bearing only by supplying a fixed amount of fluid to the fluid 21b, so that the thrust force acts in any direction of the roll axis. This can be dealt with only at one end of the roll 1 and is particularly advantageous when performing reversible operation or when changing the cross arrangement of the rolling rolls up and down.

[0022]

[0023]

In the above embodiment, the upper work roll 1
However, the same configuration is applied to other rolls on which a thrust force acts, and a case is shown in which a pressure chamber is formed at an outer position adjacent to the radial bearing 6 on the roll shaft 1a. Of course, it may be formed on the inside or on both sides, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0025]

As described above, according to the roll bearing device of the present invention, the radial bearing housed in the shaft box is mounted on the roll shaft to support the rotation of the roll. In a position on the same roll shaft adjacent to the radial bearing on the roll shaft at one end of the roll, a piston having an outer diameter large enough to inscribe the inner surface of the axle box is rotated integrally with the roll shaft. A fluid for forming a pressure chamber protruding and partitioned by the piston into two inner and outer pressure chambers in the axle box, and supplying fluid to each pressure chamber on both sides of the piston An introduction path is provided in each of the axle boxes, and a fluid constant-rate feeding device configured to supply a constant amount of fluid is connected to each of the fluid introduction paths, and further, the piston in the axle box is in a neutral position. Axle box Since there is provided a fluid discharge path that is connected to the pressure chamber and discharges fluid from inside one of the pressure chambers to the outside according to the position where the piston moves in the roll axis direction, Because the piston and the pressure chamber can function as thrust bearings, they can receive large thrust forces acting on the rolls in a compact structure, and are less likely to wear than bearing-type thrust bearings. It is easy to manage and can extend the life of the bearing.
In addition, since the piston provided on the roll shaft so as to rotate integrally with the roll shaft is incorporated in the axle box, it is not only easy to handle, but also advantageous in holding the roll axis, and Therefore, the thrust force acting in any direction of the roll axis can be dealt with only at one end of the roll by merely supplying a fixed amount of fluid, and therefore,
This is particularly advantageous when performing reversible operation or when changing the cross direction of rolls up and down.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a basic configuration on which a roll bearing device according to the present invention is based.

FIG. 2 is a partial view showing one embodiment of the roll bearing device of the present invention.

FIG. 3 is a schematic view showing an example of a conventional roll cloth rolling mill.

FIG. 4 is a schematic view showing an example of a conventional bearing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper work roll (roll) 1a Roll shaft 6 Radial bearing 8 Axle box 9 Piston 21 Pressure chamber 21a, 21b Pressure chamber part 22a, 22b Fluid introduction path 23a, 23b Fluid quantitative feeding device 24 Fluid discharge path

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 13/02 F16C 17/02 F16C 32/00 F16C 32/06

Claims (1)

(57) [Claims] 1. A roll bearing device in which a radial bearing housed in an axle box is mounted on a roll shaft to support rotation of the roll, wherein the radial bearing on a roll shaft at one end of the roll is provided. A piston having an outer diameter large enough to be inscribed on the inner surface of the axle box is protruded at a position on the same roll shaft adjacent to the inner periphery of the axle box so as to rotate integrally with the roll shaft. Pressure chambers are formed in the axle box, and fluid introduction paths for supplying fluid to the pressure chambers on both sides of the piston are provided in the axle box, respectively. A fluid metering device configured to quantitatively feed the fluid is connected to the introduction path, and further, the piston in the shaft box is communicated with the pressure chambers at a position where the piston is at a neutral position. The piston toward the roll axis A roll bearing device having a configuration in which a fluid discharge passage is provided for discharging fluid from inside one of the pressure chambers to the outside in accordance with a moving position.