JPS61255719A - Roll unit - Google Patents

Abstract

PURPOSE:To improve formal quality of a strip by forming a small diameter part on work rolls partly and forming a part corresponding to the small diameter part on reinforcing rolls which contact with the work roll directly. CONSTITUTION:A straightener consists of A and B roll units where work rolls 2A and 2B are backed up by reinforcing rolls 3A and 4A as well as 3B and 4B, respectively. Tapered parts (the small diameter parts) (e) and (f) where the top of the part has the minimum diameter are formed at an end of the work rolls 2A and 2B, respectively. Tapered parts (g) and (h) where the top of the part has the maximum diameter are formed at an end of the reinforcing rolls 3A and 4A as well as 3B and 4B, respectively. The parts (g) and (h) back up the tapered parts (e) and (f), respectively. The work rolls 2A and 2B rotate smoothly because unstable bending does not occur on the work rolls and the formal quality of a strip is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a roll unit used for correcting the shape of a strip.

<Prior Art> Generally, rolled strips have shape defects due to edge elongation, mid-elongation, etc. This shape defect is particularly noticeable in the case of strips such as rimmed steel plates, which have rim layers at both ends in the width direction and have a difference in yield stress in one width direction, or strips in which there is a difference in thickness in one width direction. .

Conventionally, a device was developed in 1985 to correct this shape defect.
The one described in Japanese Patent No. 38504 is known. For example, as shown in FIGS. 6(a), 6(b), and 6(c), backup rolls 21 and 22 reinforcing the work roll 20
Tapered portions 21a whose tips have the smallest diameter at both longitudinal ends of
, 22a are formed, and a force P8 is applied to both ends of the work roll 200 to press the work roll 20 against the tapered portions 21a and 22a, thereby warping the work roll 2° and correcting the edge elongation of the strip S. Alternatively, as shown in FIG. 7, taper portions 23a and 24a whose tips have the minimum diameter are formed at opposite ends of the backup rolls 23 and 24, and the backup rolls 23 and 24j) are formed in the direction of arrow C in the figure. By moving the work roll 25 independently, bending parts, that is, non-backup parts were formed at both ends of the work roll 25, so that both ends of the work roll 25 could be freely warped, thereby correcting the elongation of the end of the strip. Alternatively, as shown in FIG. 8, tapered portions 26a8 are formed at both ends of the work roll 26 reinforced by the backup rolls 27° 28 so that the tip has the smallest diameter, and the effect of the tapered shape and the tapered portion 26a are The end elongation of the strip S was corrected by the effect of the free reversing.

<Problems that the invention attempts to solve> In the case of the one shown in FIG. 7, this is the tapered portion 23a24a.
In the normal case, the work roll 25 is not supported, and also in the case shown in FIG. 8, the work roll 26 is not supported by the backup rolls 27 and 28 at the tapered portion 26a. For this reason, the resistance of the strip S)
The tension applied to the IJ knob S generates a pressing force on the work roll 25.26, and the work roll 25.26 is bent.

In this way, the amount of bending is determined by straightening condition 1 of strip S.
For example, the thickness and tension of the ST-IJ tube S.

The yield stress varies depending on the width dimension, the diameter dimension of the work rolls 25 and 26, the indentation, etc.

It was difficult to set correction conditions for proper shape correction. Furthermore, uneven rotation of the work rolls 25° and 26 is a cause of vibration.

There was an adverse effect on the surface quality of the strip S.

In the case of the one shown in Fig. 6, a bedding force P is added to both ends of the work roll 200 to increase the work roll 20%.
Although it is possible to solve the problem related to the above-mentioned straightening conditions by warping, the driven rotation 8 of the work roll 20 by the strip S is inhibited, so the work roll 20 stops rotating or the surface of the strip S is scratched by sliding. In addition, since the work roll 208 is forcibly pressed and warped at both ends, its central portion also warps, causing the central portion of the strike IJ tube S to extend excessively and cause middle elongation. There was a drawback that it could be stored away.

Furthermore, in the case of the one shown in FIG. 7 above, in order to accommodate changes in the width of the strip S, etc., a mechanism for moving the backup rolls 23, 24j) independently in the width direction of the IJ tube S is provided. However, since each moving mechanism needs to be built into the same roll unit, the device becomes complicated and it is difficult to ensure the device rigidity required for a shape straightening machine. Further, since the work roll 25 is deformed T in the direction zm in a plan view, smooth rotation of the work roll 25 is hindered, which has a disadvantage that the surface quality of the strip S is adversely affected.

The present invention has been made in consideration of the above-mentioned conventional circumstances, and an object of the present invention is to provide a roll unit that ensures smooth rotation of a work roll and achieves good strip shape correction.

Means for Solving the Problems> The roll unit of the present invention comprises (1) a plurality of work rolls arranged to sandwich an IJ knob, and a reinforcing roll that comes into direct contact with each work roll. In the roll unit, at least one of the work rolls has a shape in which a small diameter portion is partially formed, and the reinforcing roll in direct contact with the work roll is shaped along the shape of the work roll. It is characterized by its shape.

(Function) When correcting the shape of the strip, the work roll is evenly supported in the longitudinal direction by the reinforcing roll, so the work roll rotates smoothly as the strip moves without warping.

(Embodiment) FIG. 1 is a front view of a roll unit according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of arrows ``--'' in FIG. 1.

As shown in the figure, the roll unit equipped in the shape straightening machine for the strip S has a plurality of (two in the figure) work rolls arranged to sandwich the strip S, two people, 2g8, and each work roll. 2A and 2B are each strip 8
Unit A is placed facing each other.

It is provided in B.

In the unit A, the inner frame 6A is attached to a shape straightening machine frame (not shown) so as to be movable in either the vertical direction or the horizontal direction in FIG. 1, or both. is mounted so as to be movable in the width direction of the strip S (in the direction of the arrow in FIG. 2). Two work rolls and backup rolls 3A and 4A that directly contact and reinforce the two work rolls are supported on the bearing frame 5A, and a hydraulic cylinder is interposed between the bearing frame 5A and the inner frame 6A. By operating the moving device 7A, the bearing frame 5A and the two work rolls and the backup roll 3A are moved.

4A move together in the width direction of the strip S.

A tapered portion (small diameter portion) e is formed at one end of the work roll 2A, with the tip having the smallest diameter. On the other hand, backup roll 3A.

A tapered part g whose maximum diameter is at the tip is formed at one end of the tapered part e8 so as to back up the tapered part e8. The backup rolls 3A and 4A are shaped to fit the shape of the two work rolls so that they are in contact with the entire length. Therefore, when correcting the shape of the strip S, the two work rolls backed up by the backup rolls 3A and 4A are backed up by the tapered part g, so that unstable bending of the two work rolls does not occur, and the strip S As a result, the driven rotation is performed smoothly, and a flat strip S8 with good surface quality can be obtained. Moreover, the relative positional relationship between the taper part e1g and the strip S,
That is, if ig& in FIG. 2 is changed by the operation of the moving device 7A depending on the width dimension of the strip S, the shape of the strip S, etc., one side of the width direction of the strip S can be changed in response to the change in the width of the strip S. Defects in the shape of the end can be corrected. In this case, there is no need to change the contact relationship between the work roll 2Aξbackup rolls 3A and 4A, that is, the support conditions for the work roll 2A (because they move as one, the structure of the device is simple and sufficient device rigidity 8-IP4=# can be ensured.

The above-mentioned corrective action is performed not only by unit A but also by unit B, which has almost the same configuration as unit A. In this unit 1-8, in order to correct the shape fT of the other end of the strip S, a tapered part f whose tip is tapered and has a small diameter T is formed at the end of the work roll 2B opposite to the work roll 2A. Accordingly, the backup roll 38° 4B is also formed with a tapered portion having a maximum diameter T at the tip.

In this unit H as well, a bearing roll 5B that pivotally supports the work rolls 2B, backup rolls 3B and 4B is movably attached to the inner frame 6B. Move in the width direction of S. The inner frame 6B may be fixed to the shape straightening machine housing (not shown), but it may also be peered into the housing so as to share vertical or horizontal movement with the inner frame 6A.

FIG. 3 shows another embodiment of the present invention applied to a shape straightening machine. In this embodiment, work rolls 2A, 2B8
Backup roll 8A that directly contacts and reinforces each
, 9A.

8B, 9B8 used as intermediate roll, intermediate roll 8A,
Backup roles IOA, 11A, and 12A that back up 9A, 8B, and 9B.

118, 128, 13B. These intermediate rolls 8A, 9A, 8B.

Similar to the embodiment described above, a tapered portion that becomes a partial small diameter portion is formed in 9B, and the same effects as in the embodiment described above are achieved. In this case, backup rolls 10A, 11
A, 12A, IOB.

11B and 12B also have intermediate rolls 8A and 9A.

It is more effective to form a tapered portion with a minimum diameter at the tip corresponding to the shapes of 8B and 9B.

The backup rolls shown in each of the above embodiments are each one continuous roll.

It is also possible to use a split type roll with a splittable tapered part, and in this way, when changing the dimensions of the taper part of the lever or work roll, the backup roll only needs to be replaced with the split taper part. It has the effect of being good.

For example, as shown in FIG.
, 2B with two backup rolls 3A each,
Various conventional rolling methods are used, such as a rolling mill that backs up work rolls 4A, 3B, and 4B, and a rolling mill that backs up work rolls 2A and 2B with one backup roll 3A and 3B, respectively, as shown in Fig. 5. It can also be applied to a machine, and it is possible to roll an IJ tube S with a uniform thickness in the width direction and a flat shape.

Further, in the above embodiment, a tapered portion as a small diameter portion is formed at the end of the work roll, but depending on the shape of the strip, a tapered portion (crowning) having the smallest diameter at the center of the work roll may be formed. The work roll may be formed into a drum shape.

In addition, when constructing a shape straightening machine or rolling mill by arranging multiple work rolls with strips in between, it is not necessary to form small diameter parts on all work rolls as described above, and only one work roll can be formed depending on the degree of processing. It is enough to form a small diameter part on the above work roll.

<Effects of the Invention> According to the present invention, the large diameter portion is formed in the reinforcing roll that directly contacts the work roll so as to back up the small diameter portion of the work roll, so that there is no damage to the work roll during shape correction. No stable bending occurs.

The driven rotation of the work roll by the strip is made smooth, and a flat strip with good surface quality can be obtained. In addition, the work roll and reinforcing roll are moved integrally in the width direction of the strip.

With a device having a simple structure and sufficient rigidity, it is possible to easily accommodate changes in the width of the strip.

[Brief explanation of drawings]

Fig. 1 is a front view of a roll unit according to an embodiment of the present invention, Fig. 2 is a view taken from the ...-■ arrow in Fig. 1, and Fig. 3 is an o - front view of the unit, 4th
Fig. 5 is a front view of an El-le unit in which the present invention is applied to rolling mills of different types, and Fig. 6(a) (
b) and (c) are front views of conventional roll units, respectively;
Plan view, side S is strip, 2A, 2B are work rolls, 3A, 3B, 4A, 4B, 8A, 8B, 9A. 9B is a backup role. e and f are tapered parts (small diameter parts). g and h are tapered portions (large diameter portions).

Claims (2)

[Claims] (1) In a roll unit having a plurality of work rolls arranged to sandwich a strip and a reinforcing roll in direct contact with each work roll, at least one of the work rolls is partially formed with a small diameter portion. A roll unit characterized in that the reinforcing roll that directly contacts the work roll has a shape that follows the shape of the work roll. (2) A work roll partially formed with a small diameter portion and a reinforcing roll that has a shape that follows the shape of the work roll and is in direct contact with the work roll can be moved integrally in the width direction of the strip. The roll unit according to claim 1, characterized in that: