JP3067387B2 - 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 an improvement in a rolling mill in which only upper and lower work rolls are crossed without changing the positions of intermediate rolls and standby rolls. Thus, the thrust force generated during the operation can be reduced.

[0002]

2. Description of the Related Art One of the methods for controlling the cross-sectional shape of a rolled product with high precision is a method of slightly crossing upper and lower work rolls to change the gap distribution between the rolls, and has been put to practical use as a so-called cross mill.

In this cross mill, the rotating shafts of the upper and lower work rolls are inclined in directions opposite to each other with respect to the direction perpendicular to the line so that they cross each other.

When such a cross mill is configured as, for example, a four-high rolling mill, when only the upper and lower work rolls are crossed, and the upper and lower holding rolls supporting the work rolls are not crossed and rolled as they are, A thrust force is generated between the work roll and the rolled material, and a large thrust force is generated between the work roll and the holding roll.

Therefore, it is necessary to provide a thrust bearing at the end of the work roll or the holding roll to support the thrust force generated between the rolls by the housing.

[0006]

However, the thrust force between the rolls has a problem that the value itself is considerably large and increases with an increase in the rolling load. A large thrust bearing cannot be provided to support the thrust force.

Therefore, in a conventional cross mill, as schematically shown in FIG. 4, upper and lower work rolls 1 and 2 contacting a rolled plate W and upper and lower support rolls (pre-rolls and intermediate rolls) 3 and 4 for supporting the same. At present, these support rolls 3 and 4 are also of a pair cross type in which the support rolls 3 and 4 are crossed at the same angle so as to be parallel to the rotation axis of the work rolls 1 and 2 in order to eliminate the generation of a thrust force between the support rolls 3 and 4.

For this reason, in addition to the work rolls 1 and 2, a cross mechanism for supporting rolls 3 and 4 (pre-rolls and intermediate rolls) for supporting the work rolls 1 and 2 is required, and the structure of the cross mill becomes complicated. There is.

The present invention has been made in view of the problems of the prior art, and provides a rolling mill capable of preventing a large thrust force from being generated between a support roll and a support roll even when only upper and lower work rolls are crossed. What you want to do.

[0010]

In order to solve the problems of the prior art, a rolling mill according to the present invention includes upper and lower work rolls and at least one pair of upper and lower support rolls for supporting the work rolls. Wherein the upper and lower support rolls are formed of tapered rolls having different diameters in the roll axis direction.

The rolling mill according to the present invention is characterized in that, in addition to the structure of the first invention, the upper and lower support rolls constituted by the tapered rolls are configured so that the taper angle can be changed by a tapered piston. is there.

[0012]

According to this rolling mill, only the upper and lower work rolls are crossed, and a supporting roll such as a holding roll or an intermediate roll for supporting the work rolls is constituted by a tapered roll. The thrust force generated during the rotation is offset by using the peripheral speed of the support roll in the roll axis direction.

[0013] Accordingly, the thrust generated between the rolls can be canceled out in the rolls to greatly reduce the thrust, the support structure for the thrust can be easily formed, and a rolling mill for crossing only the work roll can be realized. Can be.

According to this rolling mill, in addition to the configuration of the first aspect, the taper angle of the support roll can be changed by the taper piston, so that the thrust force generated between the rolls can be more reliably generated. To be able to offset.

Thus, it is possible to realize a rolling mill that crosses only a work roll having a simple structure without using a pair cross type.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are a schematic perspective view and a schematic front view, respectively, of an embodiment in which a rolling mill according to the present invention is applied to a four-high rolling mill.

In this rolling mill 10, only the upper and lower work rolls 11 and 12 that are in contact with the rolled plate W are crossed. Although not shown, roll chocks at both ends supported by the housing can be moved by a cross mechanism. The rotation axes of the upper and lower work rolls 11 and 12 can cross each other in a horizontal plane in a direction perpendicular to the line.

The upper and lower rolls 13 and 14 for supporting the upper and lower work rolls 11 and 12 have their rotation axes arranged in a plane perpendicular to the line as in a normal rolling mill. Reference numeral 14 denotes tapered rolls having different diameters in the body length direction.
4 are arranged so that the large-diameter portions are respectively opposite to each other. The rotation axes of the upper and lower rolls 13 and 14 are inclined so that the side surfaces formed by the slopes of the upper and lower rolls 13 and 14 are parallel to the upper and lower work rolls 11 and 12. It is rotatably supported via a roll chock attached.

While the work rolls 11 and 14 are supported by upper and lower holding rolls 13 and 14 composed of such taper rolls,
12 are crossed with each other in the opposite direction in the horizontal plane.
Is rolled, a thrust force is generated between the upper work roll 11 and the upper holding roll 13 and between the lower work roll 12 and the lower holding roll 14 along with the roll cloth.

On the other hand, since the upper and lower holding rolls 13 and 14 for supporting the upper and lower work rolls 11 and 12 are respectively formed by tapered rolls, the upper and lower work rolls 11 and 12 are formed.
The peripheral speed of the roll side portion in contact with the roll body length direction differs, and the larger the diameter, the higher the peripheral speed, and the upper work roll 11 and the upper work roll 13 and the lower work roll 12 A thrust force is also generated between and the lower holding roll 14.

Therefore, the rolling mill 10 acts to cancel the thrust force generated by the roll cloth of the upper and lower work rolls 11 and 12 and the thrust force generated by the peripheral speed difference between the upper and lower rolls 13 and 14. Thus, the thrust force between the rolls is reduced. That is, the thrust force generated by the roll cloth of the upper and lower work rolls 11 and 12 changes according to the cross angle and the like.
On the other hand, since the thrust force due to the peripheral speed difference between the upper and lower retaining rolls 13 and 14 changes depending on the taper angle and the rotation speed of the taper roll, both thrust forces are reduced by offsetting both the thrust forces depending on the specifications and operating conditions of the rolling mill 10. The direction, taper angle, rotation speed, and the like of the upper and lower rolls 13 and 14 are set so as to be possible.

With such a rolling mill 10, it is not necessary to have a pair cross structure in which not only work rolls but also a holding roll are crossed in order to reduce the thrust force generated between the rolls as in the prior art, and only the work rolls 11 and 12 are required. Can be realized, and the structure of the rolling mill itself is greatly simplified.

Further, since the thrust force generated between the rolls can be reduced, the degree of freedom in the setting range of the cross angle increases,
A rolling mill having a large shape control ability can be obtained, and a rolled product having a good shape can be obtained.

Next, another embodiment of the rolling mill according to the present invention will be described with reference to FIG.

In this rolling mill 20, the crossing of only the upper and lower work rolls 21 and 22 in contact with the rolled plate W is the same as in the above embodiment, and although not shown, the roll chocks at both ends supported by the housing are crossed. The rotation axes of the upper and lower work rolls 21 and 22 can cross each other in a horizontal plane in a direction perpendicular to the line by a mechanism.

The upper and lower holding rolls 23 and 24 supporting the upper and lower work rolls 21 and 22 are arranged in a plane perpendicular to the line with the rotation axis thereof in the same manner as in a normal rolling mill.

The upper and lower rolls 23 and 24 are formed of tapered rolls having different diameters in the body length direction, and the taper angles thereof can be changed. It is arranged to be reversed.

The mechanism for changing the taper angle of the upper and lower rolls 23, 24 is such that a sleeve 25 is mounted on the outer periphery of the rolls 23, 24, and a plurality of taper pistons 26 are mounted inside the sleeve 25. The taper piston 26 is moved by the supply and discharge of the pressurized fluid to deform the sleeve 25 to change the taper angle.

The rotating shafts of the upper and lower rolls 23, 24 are inclined such that the side surfaces formed by the inclined surfaces of the upper and lower rolls 23, 24 whose taper angles can be changed are parallel to the upper and lower work rolls 21, 22. Yes, not shown,
It is rotatably supported via a roll chock attached to the housing at an angle.

In the rolling mill 20 provided with the upper and lower control rolls 23 and 24 formed of such taper rolls capable of changing the taper angle, the peripheral speed of the side surface of the roll contacting the upper and lower work rolls 21 and 22 by the taper rolls. Differs in the roll body length direction, and the peripheral speed increases as the diameter increases, and between the upper work roll 21 and the upper retaining roll 23 and between the lower work roll 22 and the lower retaining roll 24 based on the peripheral velocity difference. Also generate a thrust force. Since the thrust force based on the difference in the peripheral speed changes depending on the difference in the diameter in the roll body length direction, when the outer diameter of the retaining rolls 23 and 24 is changed by changing the position of the taper piston 26, the roll body length direction is changed. Changes due to a change in the peripheral speed of the motor.

Therefore, even when the operating conditions such as the rotation speeds of the upper and lower rolls 23 and 24 are fixed, the thrust force generated by changing the position of the taper piston 26 and changing the taper angle can be changed. It is possible to obtain a thrust force due to a peripheral speed difference corresponding to the thrust force generated by the roll cloth of the work rolls 21 and 22 to cancel the thrust force, and to reduce the thrust force with higher accuracy. it can.

With such a rolling mill 20, it is not necessary to adopt a pair cross structure in which not only the work rolls but also the holding rolls are crossed in order to reduce the thrust force generated between the rolls as in the prior art, and only the work rolls 21 and 22 are required. Can be realized, and the structure of the rolling mill itself is greatly simplified.

Further, the thrust force generated between the rolls can be further reduced in accordance with the cross angle, the degree of freedom in the setting range of the cross angle increases, and a rolling mill having a large shape control ability can be provided. A rolled product having a good shape can be obtained.

In each of the embodiments described above, the case where the rolling mill is constituted by a four-high rolling mill has been described. However, the present invention is not limited to this, and can be applied to a multi-high rolling mill such as a six-high rolling mill.

Further, changes may be made to each component without departing from the scope of the present invention.

[0036]

As described above, according to the rolling mill of the present invention, only the upper and lower work rolls are crossed, and the support roll for supporting the work rolls is formed of a tapered roll. The thrust force generated by the roll cloth between the work roll and the support roll can be offset by utilizing the thrust force generated by the peripheral speed difference of the support roll in the roll axis direction.

As a result, the thrust generated between the rolls can be canceled out in the rolls and greatly reduced, so that the structure for supporting the thrust force becomes easy and the control range of the roll crown is greatly expanded. A rolling mill that crosses only work rolls that can be performed can be realized.

According to the rolling mill of the present invention, in addition to the configuration of the first aspect, the taper angle of the support roll can be changed by the taper piston, so that the thrust force by the roll cloth changes. Even in this case, the thrust force generated by the peripheral speed difference of the support roll in the roll axis direction can be changed to more reliably cancel the thrust force generated between the rolls.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of one embodiment in which a rolling mill according to the present invention is applied to a four-high rolling mill.

FIG. 2 is a schematic front view of an embodiment in which the rolling mill of the present invention is applied to a four-high rolling mill.

FIG. 3 is a schematic sectional view of another embodiment in which the rolling mill of the present invention is applied to a four-high rolling mill.

FIG. 4 is a schematic configuration diagram of a conventional pair cross type rolling mill.

[Explanation of symbols]

 10,20 Rolling machine 11,21 Upper work roll 12,22 Lower work roll 13,23 Upper hold roll (support roll) 14,24 Lower hold roll (support roll) 25 Sleeve 26 Taper piston W Rolled plate

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21B 13/14 B21B 27/02 B21B 29/00 B21B 1/22

Claims (2)

(57) [Claims] 1. A rolling mill comprising upper and lower work rolls and at least one pair of upper and lower support rolls for supporting the upper and lower work rolls, wherein the upper and lower support rolls cross each other, wherein the upper and lower support rolls are tapered rolls having different diameters in the roll axis direction. A rolling mill characterized by comprising: 2. The rolling mill according to claim 1, wherein the upper and lower supporting rolls formed by the tapered rolls are configured to be capable of changing a taper angle by a tapered piston.