JPH0712483B2 - Shape controller for multi-stage cluster 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 shape control device for a multi-stage cluster rolling mill.

[0002]

2. Description of the Related Art In a multi-stage cluster rolling machine used for rolling thin sheets, a work roll having a small diameter that sandwiches a material to be rolled from above and below is supported by a backup roll via an intermediate roll and is axially aligned with a roll shaft. A plurality of rollers are fitted to form a backup roll.

Since the work roll has a small diameter, the work roll is liable to be bent in the axial direction during the rolling work, and as a result, there is a problem that the material after rolling has a shape loss such as a wave in the plate width direction and a warp. is there. Therefore, in order to improve this shape, conventionally, as shown in FIG. 9, a roller fitting portion 3 having an independent eccentric amount is provided in a predetermined eccentric direction at a portion corresponding to each roller 2 of the backup roll 1. It is eccentrically provided on the roll shaft 4, each roller 2 is rotatably fitted in each roller fitting portion 3, and the roll shaft 4 is rotated about its axis, so that the intermediate roll 5 is inserted. The crown shape of the work roll, that is, the bending state is changed (Japanese Patent Publication No. 59-48).
(Publication No. 683).

Further, as shown in FIG. 10, there is one in which each roller fitting portion 3 of the roll shaft 4 is angled (the same publication).
.

[0005]

In the former backup roll 1 having an eccentric structure, a stress peak occurs at the shoulder a of each roller 2, and the surface pressure of the intermediate roll 5 contacting this peak locally increases. The surface peeling of the intermediate roll 5 is likely to occur. Further, the shoulder mark of the backup roll 1 is likely to occur on the intermediate roll 5, and when this is transferred to the work roll, gloss unevenness occurs on the material (product).

Further, during rolling, the material to be rolled may be stretched only in each roller 2 portion of the backup roll 1, particularly in the portion corresponding to the shoulder portion a of each roller 2, and the intermediate portion between the rollers 2 may not be stretched. As a result, waves are generated in the rolled material in the plate width direction. In the latter case, the former problem can be improved to some extent. However, depending on the rolling conditions, the intermediate roll
Although the bending curve of 5 is not uniform, the roller fitting part 3
Since the angle is a constant value, there is a problem that a peak occurs on the shoulder of the roller 2 as in the former case.

[0007] In view of the above conventional problems, it is an object of the present invention to suppress the stress peak due to the shoulder of each roller.

[0008]

According to the present invention, a plurality of rollers 18 are fitted on a roll shaft 17 in the axial direction to form a backup roll 14, and both sides of each roller 18 in the axial direction are provided. In a multi-stage cluster rolling mill in which the saddles 19 supported by the housing 21 are fitted, a saddle fitting body 23 on which the respective saddles 19 are fitted so as to be rotatable relative to each other is provided eccentrically on the roll shaft 17, and the roll shaft 17 is rotated. The rotating means 29 for moving is provided.

[0009]

[Operation] The rotating means 29 rotates the roll shaft 17 around the axis to adjust the shape. That is, when the roll shaft 17 is rotated, each roller fitting body 23 is rotated integrally with the roll shaft 17. Then, when the rolling is started, the reaction force from the rolled material 10 is applied to the work roll 1
1. Since the saddle 19 is transmitted to each roller 18 of the backup roll 14 via the intermediate rolls 12 and 13 and each saddle 19 is pressed against the housing 21, the roll shaft 17 bends. Therefore, since each roller 18 is pressed through the bending of the roll shaft 17, the stress peak due to the shoulder portion of each roller 18 can be suppressed to be small.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 2, 10 is a material to be rolled, and this material 10 to be rolled is sandwiched by a pair of upper and lower work rolls 11.
Each work roll 11 has four backup rolls 14 via two first intermediate rolls 12 and three second intermediate rolls 13.
It is supported by.

Of the respective backup rolls 14, two backup rolls 14 on the center side of the rolling mill are, as shown in FIG. 3, a roll shaft 17 whose both ends are rotatably supported by bearing stands 15 and 16, Five rollers 18 rotatably fitted at equal intervals in the axial direction of the roll shaft 17, and each roller.
It is provided with six saddles 19 rotatably fitted on the roll shaft 17 on both sides in the axial direction of 18. In addition, each roller 18
Is composed of bearings. Each saddle 19 has an arcuate shoe portion 20 on the lower side, and a space between the shoe portion 20 and a bearing surface 22 formed in an arcuate shape on a housing 21 that supports the shoe portion 20 is a second intermediate roll during rolling. A slight gap is provided so that the shoe portion 20 contacts the bearing surface 22 by the reaction force from the 13 side. As shown in FIGS. 1A and 1B, the roll shaft 17 has a saddle fitting body 23 at a portion corresponding to each saddle 19.
Are fitted and connected by a key 31. Each saddle fitting body 23 is provided such that the center Y is eccentric with respect to the center X of the roll shaft 17 by an eccentric amount L, and each saddle fitting body 23 is provided.
The two in the center have the same phase, and the phases are sequentially shifted symmetrically by the same angle as they move to both ends in the axial direction.

A needle bearing is provided on the outer periphery of each saddle fitting 23.
Saddle 19 is rotatably fitted through 24, and saddle 19
19 is sandwiched between a pair of retainers 26 fixed by rivets 25 on both sides of the saddle fitting body 23. As shown in FIGS. 3 and 4, a sector gear 26 that meshes with each other is provided at one end of each roll shaft 17 of the two backup rolls 14 on the center side.
7. A hydraulic motor 29 is interlocked and coupled via a shaft 28.
The hydraulic motor 29 is provided with a speed reducer, a brake and a position detector, and the hydraulic motor 29 constitutes a rotating means.

Of the four backup rolls 14,
The saddle fitting body of the two backup rolls 14 at both ends is concentric with the roll shaft. In the above configuration, during rolling, the roll shafts 17 of the two backup rolls 14 on the center side are rotated in the opposite direction by the same angle by the hydraulic motor 29 via the gear 27 and the pair of sector gears 26 to rotate each roll. The shaft 17 is adjusted to add a predetermined deflection curve.

For example, when the roll shaft 17 is rotated in the direction of arrow a shown in FIG. 1A, the eccentric amount in the vertical direction changes in accordance with the phase difference between the saddle fittings 23. As shown, the center two saddles 19 are the lowest, and the positions of the saddles 19 are higher as they move to both sides in the axial direction.
Therefore, if rolling is started in this state, the reaction force from the material 10 to be rolled acts on each roller 18 of the backup roll 14 via the work roll 11, the intermediate rolls 12 and 13, and each saddle 19
Is pressed downward, the shoe portion 20 of each saddle 19 abuts on the bearing surface 22 of the housing 21. Therefore, the roll shaft 17 is bent in a convex crown shape as shown in FIG. 6, and each roller 18 is pressed against the intermediate roll 13 due to this bending, and the stress peak at the shoulder of each roller 18 is larger than that in the conventional case. Can be kept small.

When the roll shaft 17 is rotated in the direction of the arrow b shown in A of FIG. 1, the saddle 19 on the center side as shown in FIG.
Is higher than the saddles 19 at both ends. Therefore, during rolling, the roll shaft 17 bends in a concave crown shape as shown in FIG.
Therefore, by changing the rotation direction and the rotation angle of the roll shaft 17, the bending curve of the roll shaft 17 can be arbitrarily adjusted, and the bending state of the work roll 11 can be effectively changed. Further, since the roll shaft 17 is rotated by the hydraulic motor 29, the rotating means can be configured easily and in a small space.

The adjustment of the bending curve by the hydraulic motor 29 can be performed not only before the rolling but also in the case of a defective shape during the rolling. That is, the hydraulic motor 29 is a high torque type, and needle bearings are provided between the saddles 19 and the saddle fitting body 23.
Since the friction coefficient of the rotating part is lowered through 24,
The bending curve can be changed even during rolling.

The hydraulic motor 29 is not limited to the high torque type, but may be a low torque type. A hydraulic motor 29 may be provided on each of the two roll shafts 17. The rotating means may be an electric motor other than the hydraulic motor 29, or may be of a type that is manually rotated using a worm gear mechanism or the like.

[0018]

According to the present invention, a saddle fitting body 23 on which each saddle 19 is fitted so as to be relatively rotatable is provided on the roll shaft 17 in an eccentric manner, and a rotating means 29 for rotating the roll shaft 17 is provided. Since it is provided, a bending curve can be added to the roll shaft 17 by the reaction force from the rolled material 10 side, and the stress peak at the shoulder portion of each roller 18 can be suppressed to be smaller than in the conventional case. In addition, the rotation means 29
By rotating 17 the bending curve of the roll shaft 17 can be adjusted arbitrarily.

[Brief description of drawings]

FIG. 1A is a sectional view of a backup roll, and B is a sectional view of a saddle portion thereof.

FIG. 2 is a schematic view of a multi-stage cluster rolling mill.

FIG. 3 is a front view of a backup roll.

FIG. 4 is a view taken in the direction of arrows CC in FIG.

FIG. 5 is an explanatory diagram when a convex crown is adjusted.

FIG. 6 is an explanatory diagram of a convex crown state.

FIG. 7 is an explanatory diagram when a concave crown is adjusted.

FIG. 8 is an explanatory diagram of a concave crown state.

FIG. 9 is a partially cutaway front view showing a conventional backup roll.

FIG. 10 is a front view showing a conventional backup roll.

[Explanation of symbols]

 10 Rolled material 11 Work roll 14 Backup roll 17 Roll shaft 18 Roller 19 Saddle 21 Housing 23 Saddle fitting 29 Hydraulic motor (rotating means)

Claims (1)

[Claims] 1. A backup roll (14) is formed by fitting a plurality of rollers (18) on a roll shaft (17) in the axial direction, and at the same time, on both sides of each roller (18) in the axial direction, Housing (2
In a multi-stage cluster rolling mill fitted with saddles (19) supported by 1), each saddle (19) is fitted with an eccentric saddle fitting body (23) on the roll shaft (17) so that the saddles (19) are fitted relative to each other A shape control device in a multi-stage cluster rolling mill, characterized by being provided with a rotating means (29) for rotating the roll shaft (17).