JPS6330090B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a back-up roll support device for a leveler (including a tension leveler) that applies bending or tensile bending to a metal plate to correct the flatness of the plate. .

(Prior Art) First, an outline of a leveler will be described with reference to FIGS. 1 to 5, and then the conventional technology will be explained.

Reference numeral 5 denotes a work roll, which is movably supported by an upper frame 2 and a lower frame 3 incorporated in the stand 1 via support stands 6, respectively, and is operated by a roll lowering device 4 installed below the lower frame 3 to roll the upper and lower work rolls. The relative position between 5 and 5 can be set.

The upper and lower work rolls 5, 5 configured in this way
A leveler is generally known that corrects the flatness of the plate by passing a metal plate or metal band plate (hereinafter referred to as a strip) S between the two and applying repeated bending deformation to the strip S (see FIG. 1).

In such a leveler, in order to resist the reaction force caused by the material to be leveled, the work roll 5 is divided into a plurality of backs that are divided in the axial direction and arranged coaxially with short intervals between support points, as shown in Fig. 2. Atsprol 7
It is strongly supported by.

The back-up rolls 7 that support one work roll 5 are divided into a plurality of pieces in the axial direction, and in order to support the work roll 5, two or more sets of back-up roll rows are arranged as shown in FIG. It is arranged as follows. As shown in FIG. 4, the divided back-up roll segments are divided into outer cylinder parts 7a
It consists of a bearing part 7b and a shaft part 7c, and is generally of a non-driving type. The roll position is set by a support base 8 that supports both ends of the shaft. The bearing hole of this support base 8 is made into a split type and has a structure that prevents the roll from escaping with a bolted upper cover.

In the backup roll 7 configured in this way, when the work roll 5 supported thereon is driven by the strip S or another drive device, it rotates following the rotation of the work roll 5. In reality, due to manufacturing errors, centering errors, etc., there is a small gap G between the plurality of back-up rolls that are divided and arranged in the axial direction and the work roll 5, as shown in FIG. However, there are some that do not contact the work roll 5 evenly and do not rotate following the rotation of the work roll 5. The back-up roll 7, which is poorly followed, slides into contact with the work roll 5, resulting in damage to the surfaces of both rolls. In particular, the effect is greater as the straightening speed increases and the roll circumferential speed increases. In other words, if the loads and rotational speeds of the plurality of backup rolls 7 in the same axial direction are uneven, frictional heat is generated from the bearings 7b of the backup rolls 7 that rotate under heavy load, and the backup rolls 7 rotate under heavy load. Expand 7,
This increases the gap G between the adjacent small-load side backup roll 7 and the work roll 5, and as a result, increases the roll circumferential speed, increases the damage rate on both the work and backup roll surfaces, and shortens the life of the roll. I was getting used to it.

In addition, in order to bring the work roll into close contact with the back-up roll side, there are some products that are provided with pressing force applying means at both shaft ends of the work roll (Japanese Patent Laid-Open No. 58-110128).
(Japanese Patent Application Laid-Open No. 58-68426), these eliminate the movable portion of the movably supported work roll,
The aim is to keep the work roll in close contact with the back-up roll at all times, and a single work roll is supported in rolling motion by a plurality of back-up rolls arranged coaxially and with short support points apart. It does not solve the inconvenience of the case.

(Problems to be Solved by the Invention) The present invention improves the problems of the prior art and provides a backup roll in which a plurality of coaxially arranged backup rolls are always in even contact with a work roll or an intermediate roll. The object of the present invention is to provide a support device.

(Means for solving the problem) In a leveler that corrects the flatness of a metal strip by applying bending or tensile bending, a plurality of coaxially arranged back-up rolls jointly work together to create a work roll or intermediate The back-up rolls are supported by a support base that abuts and supports the rolls and is movable toward and away from the work roll or intermediate roll via a pressing force applying device provided at the shaft end of each back-up roll, In addition, the back-up roll, which has received a rectifying reaction force exceeding the pressing force, brings its shaft portion or a bearing fitted onto the shaft portion into contact with the support base.

(Example) Examples suitable for carrying out the present invention will be explained below with reference to FIGS. Since they are the same as those explained in the figures, the same members as those shown in FIGS. 1 to 5 are designated by the same reference numerals and their explanations will be omitted.

The device of the present invention allows the work roll 5 to have a split surface of the support base 8 that supports both shaft ends of the back-up roll 7.
The shaft mounting hole of the back up roll 7 is made approximately parallel to the tangent line of the back up roll 7, and the hole a is machined in the main body of the support base 8 and the upper cover 8a so that the split face passes through the center between the split faces. After that, a shim 9 is placed on the split surface to form an elongated hole, and a spring insertion hole b that opens on the inner peripheral surface of the hole a is bored in the direction perpendicular to the split surface of the support base 8. A spring 10 is inserted to apply a pressing force to the shaft portion 7c of the back-up roll 7 in a direction toward which it approaches the work roll 5.
Although it is desirable that the spring 10 be inserted into all the back-up roll bearing parts, it may be inserted only into the support part of a part of the back-up roll that has poor contact with the work roll or intermediate roll.

The movable dimension of the back-up roll 7 may be slightly larger than the maximum value of the gap G between the work roll 5 and the back-up roll 7, and shims 9 corresponding to this dimension are connected to the main body of the support base 8 and the upper lid 8a.
By engaging the mating surface with the back-up roll 7, the upper limit of its movement is regulated by the upper lid 8a. In this case, it is preferable that the spring 10 has an elastic force sufficient to lift the weight of the back-up roll 7 to the upper limit of its movement.

In the above embodiment, a coiled spring is used as the elastic member that applies the pressing force, but other metal springs (for example, disc springs), fluid springs, etc. may also be used. In addition, in this embodiment, the work roll 5
Although the case where the back-up roll 7 and the back-up roll 7 are in direct contact has been described, the present invention is also applied to a case where an intermediate roll is interposed between the back-up roll 7 and the work roll 5, or where the intermediate rolls are arranged in multiple stages. Good too. Furthermore, the back-up roll spring biasing movable support structure of the present invention can also be applied to a back-up roll support having a split surface parallel to the fixed surface of the upper (lower) frame.

FIG. 8 shows an embodiment different from the previous embodiment (FIG. 7), in which a bearing 11 is fitted onto the shaft portion 7c when supporting the shaft portion 7c of the back-up roll 7 on the support base 8. , the outer peripheral surface of this bearing 11 is pressed by a spring 10, but this also has the same effect.

(Function) The configuration of the present invention is as described above, and when the work roll 5 or the intermediate roll is supported at multiple points in the longitudinal direction of the axis by a plurality of coaxially arranged backup rolls 7, manufacturing errors may occur. A back-up roll that has a centering error or a centering error has a smaller diameter than other back-up rolls, so it does not contribute to receiving the correction reaction force, but it is pressed against the work roll or intermediate roll by the spring 10 inserted into the spring insertion hole b. ,
Follow rotation. When other back-up rolls receive a straightening reaction force that exceeds the pressing force, their shafts or bearings come into contact with the support base, and rigidly receive the straightening reaction force from the strip between them and the frame. .

(Effects of the Invention) As described in detail above, the present invention allows the correction reaction force from the strip to be passed through the work roll (intermediate roll) to shorten the distance between supporting points, and to be applied to a plurality of back-up rolls arranged coaxially. However, due to manufacturing errors, centering errors, differences in wear, etc., the diameter of the back-up rolls is smaller than that of other coaxially arranged back-up rolls, and supports the straightening reaction force. For back-up rolls that cannot be backed up, they are pressed against the work roll or intermediate roll, so they can reliably follow the rotation and cause no damage to the roll surface.
Therefore, the back-up rolls that cause poor tracking of the work roll and intermediate roll are wiped out, and the work roll and intermediate roll are completely removed. It is extremely effective as it can greatly contribute to improving straightening efficiency by extending the life of each roll in the backup.

[Brief explanation of the drawing]

Figure 1 is a front view of the leveler. FIG. 2 is a sectional view taken along the line - in FIG. 1. Figure 3 is an arrangement diagram of the backup roll. Figure 4 is a cross-sectional view of the installation of the backup roll. FIG. 5 is a front view taken along line - in FIG. 4. FIG. 6 shows a sectional view of an attached back-up roll to which the present invention is applied (a side sectional view taken along the line .about. in FIG. 7). FIG. 7 is a front view taken along the line - in FIG. 6.
FIG. 8 is a side view showing a modified embodiment. In the figure: 1... stand, 2... upper frame, 3... lower frame, 4... roll lowering device,
5...Work roll, 6...Support stand, 7...Backup roll, 7a...Outer cylinder, 7b...Bearing, 7c...Shaft portion, 8...Support stand, 8a...Top lid, 9... Shim, 10...Spring, 11...Bearing, S...Strip, G...Gap, a...Bearing hole, b...Spring insertion hole.

Claims (1)

[Claims] 1. In a leveler that corrects the flatness of a metal strip by applying bending or tensile bending, a work roll or an intermediate roll is jointly supported by a plurality of coaxially arranged back-up rolls. , these back-up rolls approach the work roll or intermediate roll via a pressing force applying device provided at the end of each back-up roll shaft,
The back-up roll, which is supported by a support base movable in the direction of separation and receives a corrective reaction force exceeding the pressing force, brings its shaft portion or a bearing fitted to the shaft portion into contact with the support base. A back-up roll support device for a leveler.