JPH0623405A - Rolling mill - Google Patents

Abstract

PURPOSE:To apply small diameter work rolls to work rolls in the rolling mill where the work rolls are crossed each other. CONSTITUTION:The upper and lower work rolls 1 and 2 are arranged by crossing each other in the horizontal surface. The upper and lower work rolls 1 and 2 are supported by two each upper and lower backup rolls 3a and 3b, and 4a and 4b via upper and lower medium rolls 6 and 7. The couple of upper work roll 1 and upper medium roll 6 and the couple of lower work roll 2 and lower medium roll 7 are supported pivotally displaceably in the horizontal direction so that these are crossed integrally, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill in which upper and lower work rolls are cross-arranged in a horizontal plane to roll a plate material.

[0002]

2. Description of the Related Art In recent years, the demands on the thickness accuracy of rolled products in the plate width direction have become increasingly severe. Generally, since a rolling plate has a middle height in the plate width direction, in order to cancel the thickness, a method of attaching an initial crown to the work roll in advance, or a method of bending the work roll, etc. It has been known.

However, in the case of a method in which the work rolls are provided with crowns, the number of rolls corresponding to the rolling conditions such as the plate width and thickness of the plate material is held, and the crowns are different each time the rolling conditions change. Therefore, there is a problem that the operation rate is lowered, and in the case of the method of bending the work roll, it may be added to the work roll due to the strength of the roll neck of the work roll. Since the bending force is limited, there is a problem that it is not possible to obtain sufficient thickness distribution correction ability in the plate width direction.

Therefore, as shown in FIG. 2, an example is shown in which the upper work roll 1 and the lower work roll 2 are arranged parallel to each other while keeping their axes horizontal, and the axes of the rolls intersect each other in a horizontal plane. A roll-cross type rolling machine is proposed in which the plate material 5 is rolled in a state. In addition, 3 shows an upper work roll and 4 shows a lower work roll. In this rolling mill, the thickness distribution in the width direction of the plate material 5 can be controlled by adjusting the intersection angle (cross angle) of the upper and lower work rolls 1 and 2, and the product is rolled into a product having a uniform plate thickness. Is something that can be done.

[0005]

However, in the case of the roll cross type rolling mill, the original purpose is to have a so-called crown control capability of canceling the roll deflection and correcting the thickness distribution in the strip width direction. However, there is a problem that a thrust force is generated in the work roll because the roll is inclined and rolling is performed. Therefore, it is necessary to make the bearing that supports the thrust load considerably large, but when the roll diameter is small, the usable bearing is also small and the service life is shortened.Therefore, it is suitable for rolling thin plates and difficult-to-process materials. There is a problem that a suitable small diameter work roll cannot be used.

Therefore, the present invention is intended to provide a rolling machine of roll cross type which can use a work roll having a small diameter.

[0007]

In order to solve the above-mentioned problems, the present invention arranges the upper and lower work rolls so as to cross each other in a horizontal plane, and the upper and lower work rolls are rotatably supported by upper and lower parts. Two backup rolls are supported via intermediate rolls, respectively, and the upper intermediate roll and upper work roll and the lower intermediate roll and lower work roll can be displaced in a horizontal plane so as to cross each other in parallel. It is configured to be pivoted.

[0008]

Since the work roll and the intermediate roll can be simultaneously crossed and horizontally displaced and the intermediate roll is supported by the two backup rolls, a thrust force is not generated between the intermediate roll and the work roll. The thrust force acting on the work roll without being generated is only from the plate material, and the thrust force acting on the work roll is small, and therefore,
Applicable to small diameter work rolls. Further, although the thrust force acts between the intermediate roll and the backup roll, the intermediate roll and the backup roll can be made sufficiently large, so that the bearing can be made large and there is no problem.

[0009]

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

FIG. 1 shows an embodiment of the present invention. Like the rolling mill shown in FIG. 2, in the rolling mill in which the upper and lower work rolls 1 and 2 are arranged in a cross in a horizontal plane, The upper and lower backup rolls 3a and 4a are arranged on the entrance side of the pass line L by the work rolls 1 and 2, and the upper and lower backup rolls 3b and 4b are arranged on the exit side of the pass line L, respectively. An upper intermediate roll 6 is provided between the upper backup rolls 3a and 3b,
Also, the lower work roll 2 and the lower backup rolls 4a, 4
Lower intermediate rolls 7 are respectively interposed between b and
Each of the backup rolls 3a, 3b, 4a, 4b is axially supported so as to be vertically displaceable, and the set of the upper work roll 1 and the upper middle roll 6 and the set of the lower work roll 2 and the lower middle roll 7 are formed. , Are simultaneously supported in the same direction and are axially supported so that they can be integrally displaced in the horizontal direction.

More specifically, the window 8a of the housing 8
A backup roll chock 10 that can be moved up and down by an elevating device 9 is provided in the upper and lower parts of the backup roll chock 10, and the backup roll 3 is attached to each backup roll chock 10.
The shafts a, 3b, 4a, 4b are supported so as to be tiltable via spherical seats, etc., and the backup roll chock 10 can be displaced in the vertical direction by appropriately operating each elevating device 9, thereby providing a backup roll. 3a,
It is arranged that 3b, 4a and 4b can be displaced in the vertical direction. Further, the guide blocks 12 are fixed to the inner front and rear inner side surfaces of the window 8a of the housing 8, and the upper and lower intermediate roll chocks 13 are arranged between the front and rear guide blocks 12 so as to be vertically and horizontally displaceable. , The intermediate rolls 6 and 7 are respectively supported by the intermediate roll chocks 13, and the work roll chocks 14 are attached to the upper and lower facing surface portions of the intermediate roll chocks 13 so as to be vertically displaceable,
The work rolls 1 and 2 are supported by the upper and lower work rolls 1 and 6 and the lower work roll 2 and the lower middle roll 7 are paired so as to be horizontally displaced. In addition, 11 shows a reduction cylinder.

When adjusting the cross angles of the upper and lower work rolls 1 and 2 in the state shown in FIG. 1 to further increase, the operation of each elevating device 9 causes the working side to move in the direction of the arrow in FIG. Each backup roll chock 10
While displacing each backup roll chock 10 on the drive side in the opposite arrow direction. As a result, the upper backup rolls 3a and 3b and the lower backup rolls 4a and 4b are vertically crossed so as to be rotated around the roll center of gravity as a fulcrum, so that the upper intermediate roll 6 that contacts these upper backup rolls 3a and 3b. , And lower backup rolls 4a, 4b
The lower intermediate roll 7 that comes into contact with
Further, on the drive side, it is displaced horizontally in the direction opposite to the arrow, and as a result, the upper and lower work rolls 1 and 2 are also displaced in the same direction as the upper and lower intermediate rolls 6 and 7 as a result.
The cross angle will be adjusted more greatly.

Thus, the four backup rolls 3
When the a, 3b, 4a, and 4b are associated and displaced so as to rotate about the roll center of gravity in the vertical plane, the upper and lower work rolls 1 and 2 are replaced by the backup rolls 3a, 3b, and
Since it can be displaced along the lines 4a and 4b, the cross angle can be easily changed, and an arbitrary angle from a small cross angle to a large cross angle can be set.

In the present invention, the upper and lower work rolls 1,
2 is arranged to cross the upper and lower intermediate rolls 6 and 7, and the upper and lower intermediate rolls 6 and 7 are respectively supported by two backup rolls 3a, 3b and 4a, 4b. The thrust force acting between the upper and lower work rolls 1 and 2 can be reduced because no thrust force is generated between the upper and lower work rolls and the intermediate rolls. As the bearings of the rolls 1 and 2, ordinary bearings can be used. Therefore, it is possible to use, as the upper and lower work rolls 1 and 2, rolls having a small diameter suitable for rolling thin plates or difficult-to-process materials. In this case, if a small-diameter work roll is applied to the upper and lower work rolls 1 and 2, the rolling load can be reduced, and accordingly, the backup rolls 3a, 3b, 4
The diameters a and 4b can also be made small, and the driving power can be made small. As a result, the entire equipment can be made small, which is advantageous in terms of space and cost.

Further, in the above, when the rolling operation is performed, in addition to the effect of crossing the upper and lower work rolls 1 and 2, the upper backup rolls 3a and 3b and the lower backup rolls 4a and 4b are respectively the upper work roll 1 and the lower work roll 1a. Since the upper work roll 1 and the lower work roll 2 are in contact with the positions deviating from the positions immediately above and below the intermediate rolls 6 and 7 which are in contact with the work roll 2, the vertical deflection of the upper work roll 1 and the lower work roll 2 is not restricted as compared with the conventional rolling mill. The crown control capability can be increased.

In the above embodiment, the present invention shows the case where the backup rolls are displaced in the vertical direction in order to integrally cross the work roll and the intermediate roll, but the backup rolls are moved in the horizontal direction. Of course, or may be displaced in the tilt direction in a range between the vertical direction and the horizontal direction, and various changes may be made without departing from the scope of the present invention. .

[0017]

As described above, according to the rolling mill of the present invention, the upper and lower work rolls crossed in the horizontal plane are crossed together with the intermediate roll so that the work rolls can be integrally displaced horizontally. Since the intermediate rolls are supported by two upper and lower backup rolls,
The thrust force acting on the work roll can be reduced, which allows the work roll to be applied with a small-diameter work roll suitable for rolling thin plates and difficult-to-process materials, thus reducing the power of rolling load. Further, since the backup roll is located at a position deviated from the position directly above and below the work roll, the crown control capability can be expanded, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a rolling mill of the present invention.

FIG. 2 is a schematic view showing an example of a conventional pair roll cross type rolling mill.

[Explanation of symbols]

 1 Upper work roll 2 Lower work roll 3a, 3b Upper backup roll 4a, 4b Lower backup roll 6 Upper intermediate roll 7 Lower intermediate roll

Claims (1)

[Claims] 1. The upper and lower work rolls are arranged so as to cross each other in a horizontal plane, and the upper and lower work rolls are respectively supported by two upper and lower backup rolls that are displaceably axially supported, via intermediate rolls, respectively. A rolling mill having a structure in which an upper intermediate roll and an upper work roll and a lower intermediate roll and a lower work roll are axially supported so as to be displaceable in a horizontal plane so as to cross each other in parallel and integrally.