JPH0671601B2 - Rolling method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rolling method by a cluster rolling mill in which a plurality of reinforcing rolls supporting a work roll are axially divided.

<Prior Art> In recent years, in the field of rolling, it has been required to increase the reduction rate of sheet thickness, that is, the reduction rate, in one rolling process from the viewpoint of improving productivity and energy saving. A cluster rolling mill 100 shown in FIG. 4 is known as one of the rolling mills that enables such high-pressure rolling. In this cluster rolling mill 100, a work roll 104 that directly holds a strip 102 is reduced in diameter, and the work roll 104 is supported by an intermediate roll 106 as shown in the figure. Furthermore, as shown in FIG. This intermediate roll 1 is made up of 5 divided reinforcing rolls 108.
06, and the individual rolls 108a, 108b, 108c of the reinforcing roll 108 are the support shafts 110 of the reinforcing roll 108.
The eccentric bush 112a, 112b, 112c through the intermediate roll 10
Mounted so that it can move in the direction of 6, the intermediate roll 1
The profile of the reinforcing roll 108 in contact with 06, that is, the crown pattern, can be adjusted to an arbitrary shape by the drive mechanism 111 for eccentrically rotating the eccentric bush 112b. With such a configuration, the cluster rolling mill 100 has a crown pattern of the reinforcing rolls 108 such as elastic deflection or flat deformation of the surface of the work roll 104 that occurs in the roll group even under high pressure rolling of a thin strip. Can be corrected by appropriately selecting, for example, so-called middle stretch or end stretch in which the central portion or the end portion of the rolled strip 102 is wavy can be eliminated, and rolling with good shape accuracy can be performed.

<Problems to be Solved by the Invention> However, when the horizontal width of the strip to be rolled is shorter than the cylinder length of the work roll 104, it is located near both sides of the individual rolls of the reinforcing roll 108. The contact pressure of the roll 108c with the intermediate roll 106 is reduced, which hinders the rotation transmission between the intermediate roll 106 and the roll 108c, and the slip between them may damage their surfaces. there were. If the damage occurs on the surface of the intermediate roll 106 or the like in this way, it is also transferred to the work roll 104, which makes the rolling operation of the cluster rolling mill 100 impossible, and also for repairing or replacing the work roll 104 or the like. There was a problem that it required a very large cost.

<Means for Solving Problems> The present invention provides a rolling method that does not cause damage to the roll surface even when the width of the strip to be rolled in the rolling using the cluster rolling mill is short. For the purpose, when it is determined that the horizontal width of the strip during rolling is shorter than the cylinder length of the work roll and causes damage to the roll surface, the intermediate rolls facing the rolls near the axial ends of the reinforcing roll are opposed to each other. The distance between them was kept completely out of contact with each other.

<Operation> When the rolls near the both ends in the axial direction of the reinforcing rolls are moved away from each other by the facing intermediate rolls and both of them are placed in a completely non-contact state, and a roll pattern is formed to press and support the intermediate rolls by the other rolls, contact occurs. It is possible to prevent damage due to pressure reduction, and it is possible to form a crown pattern that can apply an appropriate pressing force to the intermediate roll by other rolls, so it is possible to perform rolling with good shape accuracy even with a strip with a short width. .

<Example> The method of the present invention will be described below. FIG. 1 is an example of an apparatus for carrying out the present invention, and shows one half on one side in the axial direction of a cluster rolling mill 2 similar to that described in the conventional example. This cluster rolling mill 2 has a pair of work rolls 6 for holding the strip plate 4 arranged vertically, and is equipped with an intermediate roll 8 and a reinforcing roll 10 on one side of the work roll 6.
Both the intermediate roll 8 and the reinforcing roll 10 are parallel to the axis of the work roll 6, and are in contact with each other so that rotational power is transmitted.

The reinforcing roll 10 is attached to the chock 11 via a support shaft 12, and is divided into five in a direction parallel to the support shaft 12, and one side thereof, that is, the support shaft 12 is shown in the drawing.
The center roll 10a arranged at the center in the axial direction is shown on the right side in the figure, and the quarter rolls 10b provided on both sides of the center roll 10a are shown at the center in the figure.
End rolls 10c arranged on both sides of 0b are shown on the left side of the drawing. Of these rolls, the center roll 10a is mounted so as to rotate coaxially with the support shaft 12 via a bush 14, but the quarter roll 10b and the end roll 10c.
Are both supported by a small eccentric bush 16 and a large eccentric bush 18.
The small eccentric bushing 16 and the large eccentric bushing 18 are eccentrically mounted on the outer circumference 12 and are rotatably attached to the outer circumferences thereof. The amount of eccentricity of the large eccentric bush 18 with respect to the support shaft 12 is small.
It is set to be larger than that of 16, and the rotation angle with respect to the support shaft 12 can be arbitrarily changed by the drive mechanism 20. Further, the end portion 12b of the support shaft 12 that supports the large eccentric bush 18 is made smaller in diameter than the central portion 12a that supports the small eccentric bush 16 and the bush 14 of the center roll 10a, and the central axis of the central portion 12a The center axis is shifted and set.

If such a cluster rolling mill 2 is used, the end roll 10c
Since the eccentricity of the work roll 6 is larger than that of the quarter roll 10b, if the lateral width of the strip 4 held by the work roll 6 is shorter than the body length of the work roll 6, the end roll 10c is replaced by the intermediate roll. It is possible to keep them both in a non-contact state by keeping the distance from 8 or more. If the end roll 10c and the intermediate roll 8 can be set in a non-contact state as described above, it is possible to prevent the occurrence of damage due to slippage between the end roll 10c and the intermediate roll 8.

Another example of an apparatus for carrying out the present invention is shown in FIG.
The structure of the cluster rolling mill 30 shown in the figure is substantially the same as that of the cluster rolling mill 2 described above, and the same members such as the work roll 6 and the intermediate roll 8 are denoted by the same reference numerals and the description thereof will be omitted. Support shaft 34 supporting the reinforcing roll 32
Are formed to have the same diameter in the axial direction, and the end rolls 32c and the quarter rolls 32b attached to the support shaft 34 can change their eccentric positions by the eccentric bush 34, and the center roll 32a also Similarly to these, it is attached to the eccentric bush 34 and can be eccentric with respect to the support shaft 34. Since the cluster rolling mill 30 is configured as described above, the end surface H of the center roll 32a of the reinforcing roll 32 shown in FIG. 3 (a) is schematically shown in FIG. 3 (a) as shown in FIG. 3 (b). It becomes possible to adjust the position change from the position of h to the position of h ′ shown by the intersection of the two-dot chain line, and the end faces H ₁ and H _{2 of the} quarter roll 32b and the end roll 32c.
The adjustment range of the roll crown of the reinforcing roll 32 formed by the movable range of, that is, the range surrounded by the solid line in the figure has been expanded by the range indicated by the two-dot chain line,
As a result, the distance between H and H ₂ can be increased, the end roll 32c can be separated from the intermediate roll 8 by that amount, and both can be kept in a non-contact state. The present invention can also be implemented by the cluster rolling mill 30 configured as described above, and damage to the intermediate roll 8 and the like can be prevented.

In the above embodiment, the rolling mill as shown in FIG. 4 has been described, but the present invention is not limited to such a type of cluster roll, and the other side of the strip of the cluster roll is sandwiched. The same applies to the rolls of No. 1, and the same rolls as the cluster rolls may be arranged so as to be symmetrical with respect to each other, or a multi-stage roll in which rolls are vertically arranged in series can be used. Further, the number of divisions of the reinforcing roll is set to 5 in the present embodiment, but other number of divisions may be used.

<Effect of the Invention> According to the method of the present invention, in the case where the lateral width of the strip to be rolled is shorter than the cylinder length of the work roll, the vicinity of the shaft end of each of the rolls of the reinforcing roll is divided. Since the rolls of No. 1 and No. 2 were separated from the opposite intermediate rolls and both were kept completely out of contact with each other, slippage between the reinforcing rolls and the intermediate rolls was caused during the rolling of such a strip with a short width. Therefore, it is possible to prevent the occurrence of surface damage and to perform good rolling work.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an example of a cluster rolling mill for carrying out the method of the present invention, and FIG. 2 is a partial sectional view showing another example of the cluster rolling mill in FIG. 1, 3 is an explanatory view of a reinforcing roll of the cluster rolling mill in FIG. 2, FIG. 4 is a partial cross-sectional view showing a conventional cluster rolling mill, and FIG. 5 is a cross-sectional view taken along the line AA of FIG. Is. In the drawing, 2,30,100 is a cluster rolling mill, 4,102 is a strip plate, 6,104 is a work roll, 8,106 is an intermediate roll, and 10,32,108 are reinforcing rolls.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Yamada 1 Kawasaki-cho, Chiba-shi, Chiba Inside the Chiba Works, Kawasaki Steel Co., Ltd. (56) References JP-A-60-196206 (JP, A) JP-A-62- 86121 (JP, A)

Claims (1)

[Claims] 1. A pair of upper and lower work rolls for rolling a strip, an intermediate roll provided on at least one side of the work roll for supporting the work roll, and the work roll pressed through the intermediate roll. In rolling using a cluster-type rolling mill comprising a plurality of reinforcing rolls divided along a direction parallel to the axis of these work rolls, the lateral width of the strip to be rolled is the body length of the work roll. If it is shorter than the above, a part of the reinforcing roll is separated from the intermediate roll and both of them are placed in a non-contact state to roll the strip.