JP2564778Y2 - 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 rolling mill having a roll crossing mechanism.

[0002]

2. Description of the Related Art In recent years, there has been known a technique for obtaining a crown effect by intersecting backup rolls or work rolls of a multi-high rolling mill with each other, and a rolling mill having a roll crossing mechanism for appropriately intersecting the rolls. Various machines have been proposed (for example, Japanese Patent Publication No. 60-2924, Japanese Patent Publication No. 63-65404).

As shown in FIGS. 2 and 3, a conventional rolling mill of this type has a work roll 4, 5 of backup rolls 2, 3 and work rolls 4, 5, which are provided in a housing 1 in multiple stages. The axle box 7 for rotatably supporting the axle end 6 is appropriately moved in the horizontal direction by a moving means such as a plunger (not shown) so that the center position of the rolls 4 and 5 (in the width direction of the rolling plate 8). The rolls 4 and 5 can be cross-held at a crossing angle (skew angle) θ such that a desired crown amount (gap) is generated, for example, θ = 0 to 2 degrees. It has become.

[0004]

However, in such a rolling mill, since a large thrust force P corresponding to the crossing angle θ is generated along the rolls 4 and 5, it cannot be supported by a normal bearing structure. was there. That is, in the case of rolls parallel to each other, the thrust force is
Since it is about 1 to 2%, ordinary roller bearings or ball bearings are sufficient, but in the case of crossing rolls, the thrust force reaches as much as 30% of the rolling force depending on the crossing angle.

In order to solve such a problem, as shown in FIG. 4, a convex portion 9 is provided on the outer periphery of the shaft end 6 of the rolls 4 and 5, and a roller bearing 10 is disposed so as to sandwich the convex portion 9 in the axial direction. Thus, it is conceivable to form a thrust bearing structure. However, in such a configuration, the rolls 4 and 5 are set at 1,000 to 2,000 rpm.
When rotating at such a high speed, the life of the parts is shortened without being able to withstand the centrifugal force. As a result, operation at high speed cannot be realized.

In view of the above circumstances, the present invention has been devised to provide a roll crossing rolling mill that can appropriately cope with a thrust force during high-speed rotation.

[0007]

Means for Solving the Problems The present invention is, The rewritable rotatably accommodate the shaft ends of the roll, the reaction force to be anti-thrust force
In rolling mill having a roll crossing mechanism for setting the angle of intersection by moving appropriately the axle box to grant, provided disc-shaped shaft receiving face in the axial end of the roll rotating at a high speed, the inside the shaft box form forms a bearing chamber for the shaft bearing surface of the disc-shaped surround at a predetermined gap, in the bearing chamber
While supplying and discharging fluid, the bearing chamber and the bearing surface
Applying the reaction force to the bearing surface by forming an oil film between the gap between the
Flow body supply and discharge hand stage for those that were provided.

[0008]

With the above construction, the fluid supply means generates an axial reaction force between the bearing chamber in the axle box and the bearing surface portion by forcing the fluid into the gap, thereby causing the roll to rotate intersectingly. It receives a thrust force along the axial direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a rolling mill according to the present invention, and clearly shows a work roll 11 which is a main part of a multi-high rolling mill constituted by four rolls. This rolling mill is provided with a roll crossing mechanism 13 for moving an axle box 12 of a work roll 11 and intersecting the work rolls 11 appropriately.
A bearing surface portion 15 is provided at a shaft end 14 of the shaft.
With the bearing chamber 16 to a portion and the shaft receiving face 15 of the end 14 surrounds at a predetermined gap S is formed, the clearance S
Fluid supply and discharge hand stage 17 of the order to form an oil film is subjected supplying fluid serving oil at a predetermined pressure is formed provided.

The shaft box 12 is provided with a shaft end 14 of the work roll 11.
Is rotatably supported inside and is held via a roll crossing mechanism 13 in a housing 19 which is a fixed system. That is, the work rolls 11 are formed so as to change the intersection angle between the work rolls 11 by being swung about the roll center point O. The roll crossing mechanism 13 includes a pair of plungers 20 which push the axle box 12 in the horizontal direction, and an arc shape from the side surface of the axle box 12 along a swing locus about the swing center point (O). Guide member 21 and housing 1
9 and a guide hole 22 for slidably holding a guide member 21. The plunger 20 is driven in synchronization with a similar mechanism at the other shaft end (not shown) to drive the work by a predetermined amount. The roll 11 can be swung.

The shaft end 14 has a large-diameter roll main body-side portion 23 engaged and held by a radial bearing 18 and an extended shaft portion reduced in diameter from its end face and integrally extending outward in the axial direction. A disk 25 is attached to the extension shaft portion 24 in a flange shape . Shaft receiving face 15,
Axis Direction inward side of the circular plate 25 (the left side in the figure) and outer
(Right side in the figure) .

The bearing chamber 16 includes a disk 25 and a roll body side portion.
Min 23, is formed to surround the 及 beauty extended shaft portion 24, in particular the bearing surface portions 1 5, of the axle box 12 you face the bearing surface 15
And is a Jo Tokoro gap S between the wall surface, the axial direction of the clearance S
Inward direction extends to the stepped portion of the roll the side portions fraction 23 and the extension shaft portion 24 is partitioned into substantially sealed manner.

An oil passage 26 extending in the axial direction inside the axle box 12 is communicated with the gap S, and is opened at an axially outer end face of the axle box 12. Element, the open end of this
Is connected oil pipeline 28 Oh Iruponpu 27, they pumped the oil is to be supplied from the oil reservoir 29 by an oil pump 27. Also, it is formed an oil passage 30 back to a position opposite the oil passage 26 across the disc 25, which is the oil of the bearing chamber 16 so as to circulate back to the oil reservoir 29. Therefore, this is found in the oil passage 26, oil reservoir 29, oil pump 27, return oil passage 3
By 0, etc., so that the fluid supply and discharge hand stage 17 is constituted. Your name, pump pressure was constant, you in the axial direction
From the swing center point O to the axle box 12 (to the right in the figure)
Response of the scan last force P of clearance S of the axial direction outer side is narrowed to increase, the oil is compressed, the thrust force P
A reaction force, which is a counter-thrust force, is generated.
It may be one which imparts to the section 15, but provided with a flow control valve (not shown) in the middle of the oil pipe 28, der that to be able adjust the pressure or supply quantity in accordance with the operating conditions
You may. Here, the work roll 11 is
From the axle box 12 to the swing center point O (to the left in the figure)
When the thrust force P is generated, the fluid supply / discharge means 1
7, the formation positions of the oil passage 26 and the return oil passage 30 are reversed.
Become.

Next, the operation of this embodiment will be described.

When rolling is performed by the intersecting work rolls 11, the plunger 20 of the roll crossing mechanism 13 is driven to move the axle box 12, thereby obtaining a crossing angle of 0 to 2 degrees, for example. On the other hand the fluid supply and discharge
Drives the oil pump 27 of the hand stage 17 supplies a predetermined pressure of the oil in the gap S of the bearing chamber 16. While the work roll 11 is rotatably supported by the radial bearing 18 of the axle box 12, with the high-speed rotation of the work roll 11
From the swing center point O in the axial direction to the axle box 12 (in FIG.
No scan last force P is issued to the right direction), word along with this
The entire crawl 11 moves in the direction of the thrust force P. This
, The roll body side portion 23, the extension shaft portion 24, and
A predetermined pressure is supplied to the gap S between the disk 25 and the bearing chamber 16.
An oil film is formed by the oil
The entire crawl 11 moves in the direction of the thrust force P.
As a result, the gap S on the outer side in the axial direction is reduced, and
The file is compressed under the thrust force P. This compression
The thrust force corresponding to the thrust force P is applied to the bearing surface 15 by the force.
Provides strike force. As a result, the sum over crawl 11
Is stably rotated and held by the axle box 12.

As described above, the disk 25 that defines the bearing surface portion 15 is formed on the extension shaft portion 24 of the work roll 11, and the bearing chamber 16 that surrounds this with a predetermined gap S is formed between the bearing chamber 16 and the shaft box 1.
2, the oil pump 27 supplies oil at a predetermined pressure to the gap S, so that the axial box 12 can properly receive the thrust force P generated with the rotation of the intersecting work rolls 11. Rolling of roll crossings by high-speed rotation can be realized. Further, since the bearing chamber 16 filled with oil surrounds the extension shaft portion 24 and the disk 25, the bearing chamber 16 can sufficiently withstand radial centrifugal force and is extremely durable.

In the present embodiment, the bearing surface portion 15 is defined by the disk 25. However, in some cases, the bearing chamber is separated from the end surface of the roll shaft by using the end surface of the roll shaft end. It may be formed and supplied with a fluid.

The oil pump 27 of the fluid supply means 17
For example, a lubrication system (not shown) for the radial bearing 18 may be used. Further, in the present embodiment, the configuration in which the work rolls 11 are crossed is shown, but the present invention can be similarly applied to a rolling mill in which backup rolls cross. The rolling mill is not limited to a four-high rolling mill, but can be naturally applied to a five-high or six-high rolling mill.

[0020]

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

[0021] The bearing surface portion formed along the radial direction to an axial end of the roll is provided, forms the shape of the bearing chamber surrounding the bearing face at a predetermined gap in the axial box, and supply fluid to the bearing chamber
As well as draining, an oil film is formed in the gap between the bearing chamber and the bearing surface.
Forming a fluid supply, the order to impart a reactive force to the bearing surface portion
By providing the discharge hand stage, the thrust force of the roll crossing can be obtained by a fluid pressure, high-speed rotation in the rolling mill having a roll crossing mechanism can be realized.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a main part showing an embodiment of a rolling mill according to the present invention.

FIG. 2 is a plan view showing a conventional rolling mill.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a cross-sectional view of a main part for describing a problem of the related art.

[Explanation of symbols]

11 rolls (working rolls) 12 the axle box 13 roll crossing mechanism 14 shaft end 15 bearing surface 16 bearing chamber 17 the fluid supply and discharge hand stage S clearance

Claims (1)

(57) [Scope of request for utility model registration] 1. A co-and rotatably accommodated a shaft end of the roll
In a rolling mill having a roll crossing mechanism for setting an intersection angle by appropriately moving an axle box that applies a reaction force serving as a counter thrust force, the roll rotating at a high speed
Provided disc-shaped shaft receiving face at the shaft end of a disc inside the shaft box
Jo of the shaft bearing surface forms form a bearing chamber surrounding at a predetermined gap, the supplying and discharging fluid to the bearing chamber co
To form an oil film between the gap between the bearing chamber and the bearing surface
Flow body supply and discharge for applying the reaction force to the bearing surface portion Te
Rolling mill, characterized in that a hand stage.