JP2003039113A - Roller leveler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller leveler capable of lowering the compression transforming ratio by imparting a rigidity auxiliary function in the width direction center of the roller leveler. SOLUTION: The roller leveler characterized by the feature that the roller leveler performs straightening of a material to be corrected through the material to be corrected between leveling rolls 2, 3 making a pair vertically and the roller leveler is provided with vertical backup rolls 4, 5 to backup vertical leveling rolls 2, 3 respectively, a crowning device 9 to impart a roll crown from either one side 4 of vertical back rolls 4, 5 and a central crowning device to grant a larger projecting crown from the width direction both sides in the vicinity of the width direction center of the other backup roll 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a roller leveler.

[0002]

2. Description of the Related Art A conventional roller leveler 101 includes, as shown in FIG. 12, upper and lower leveling rolls 102 and 103 through which a material L to be straightened passes, and upper and lower leveling rolls 10.
It has upper and lower backup rolls 104 and 105 for backing up 2, 103. The lower backup roll 105 is supported by the lower roll frame 106,
Below the lower roll frame 106 is a lower frame 107.
Are arranged. Also, the upper backup roll 1
04 is supported by the upper roll frame 108, and the upper roll frame 108 is provided with a crowning mechanism 109 composed of a hydraulic cylinder.

[0003]

SUMMARY OF THE INVENTION For example, a tensile strength of 50 k
When the plate width of the material to be straightened is about 3 to 4 m and the plate thickness is 45 mm or more, if the plastic deformation rate is 0.80 or more, a strong roll crown is not applied from the upper crowning mechanism 109 to flatten the surface. It is not possible to reduce the degree of deviation and the deviation in the width direction of the material to be straightened. However, the conventional leveler 1
In 01, since the crowning mechanism 109 is on the upper part,
When a strong roll crown is applied during straightening, the lower leveling roll 103 and the lower backup roll 10
5, the lower roll frame 106 and the lower frame 107 are subject to compressive deformation and the like, and there is a problem that the required accuracy cannot be obtained. In particular, as shown by the deformation curve D in FIG. 13, the compressive deformation at the widthwise central position becomes large, and the thickness deviation at the widthwise central position of the material to be corrected becomes large,
It is very difficult to ensure accuracy when the load is high.

The inventors of the present invention firstly addressed the problem of compressive deformation by first lower roll frame 106 and lower frame 10.
By increasing the rigidity of No. 7, it was thought that the compression deformation rate would be reduced and the accuracy would be improved. However, as a result of examination, it was found that even if the rigidity of the lower roll frame 106 and the lower frame 107 is increased, the compression deformation rate cannot be sufficiently reduced. Moreover, the lower roll frame 106 and the lower frame 10
If the rigidity of No. 7 is increased, the cost is increased and the weight is increased, which causes new problems such as the need to change the crane capacity in the rolling mill.

The present invention has been made in view of the above problems, and the first problem to be solved by the present invention is to provide a rigidity assisting function to the widthwise center of the roller leveler to reduce the compression deformation rate. Especially. A second problem to be solved by the present invention is to improve the accuracy by positively adding a crown to the lower part of the roller leveler to reduce the compressive deformation of the lower part of the roller leveler when there is a crowning mechanism in the upper part of the roller leveler. is there.

[0006]

The present invention adopts the following technical means in order to solve the above problems. That is,
A feature of the present invention is a roller leveler for straightening a material to be straightened by passing a material to be straightened between a pair of upper and lower leveling rolls, the upper and lower backup rolls respectively backing up the upper and lower leveling rolls, and the upper and lower backup rolls. It has a crowning device for applying a roll crown from one of the two sides, and a central crowning device for providing a convex crown near the widthwise center of the other backup roll.

For example, when a crowning device is provided on the upper side, a central crowning device gives a convex crown to the central portion in the width direction for the other lower backup roll to assist rigidity in the central portion in the width direction. Deflection due to compression deformation can be corrected and the correction ability can be improved. Therefore, the first problem is solved by the above configuration. This roller leveler is particularly useful when the material to be straightened is narrow and has high tensile strength or strict finishing accuracy.

Further, the backup roll is divided in the width direction, and the central crowning device is arranged such that one of the backup rolls divided in the width direction located near the center in the width direction is directed to the leveling roll side. It is preferably configured to move. Further, the central crowning device is configured by providing an eccentric mechanism on one of the backup rolls divided in the width direction and located in the vicinity of the center in the width direction, and the eccentric mechanism is provided on the axis of the backup roll. It can be configured such that it has a rotating body that is eccentrically attached to the backup roll, and that the backup roll can be moved up and down by rotating the rotating body.

Further, as the eccentric mechanism, it is possible to apply the principle of the eccentric mechanism found in the drive by the chain or the wheel drive of the train, in addition to those exemplified in the embodiments described later. Another aspect of the present invention is a roller leveler for straightening a material to be straightened through a material to be straightened between a pair of upper and lower leveling rolls, an upper and lower backup roll that backs up the upper and lower leveling rolls, respectively, and An upper crowning device for giving a roll crown from the upper backup roll side is provided, and a lower crowning device for giving a crown from the lower backup roll side to correct (small) the compressive deformation of the lower part by the upper crowning device is provided. It is characterized by that.

By applying the crown by the lower crowning device, the compressive deformation of the lower part of the roller leveler is corrected, and the flatness and the width direction deviation can be secured in the correction by the roller leveler. Therefore, the second problem is solved by the above configuration. Further, it is preferable that the lower roll frame having the lower leveling roll and the lower backup roll is provided with a scale removing device that generates a fluid flow to remove the scale separated from the surface of the material to be straightened. If a crowning device is installed at the bottom of the roller leveler, the scale generated from the material to be straightened easily accumulates, which may cause functional deterioration and scratches.
By providing a scale removing device in the lower unit, it is possible to prevent scale accumulation and scale adhesion to the driving device of the lower crowning device.

Further, the lower crowning device raises a plurality of backup rolls in the vicinity of the center position in the width direction among the backup rolls divided in the width direction to give a crown, and It is preferable that the load distribution be balanced by suppressing the rising amount of the backup roll from both sides in the width direction with respect to the rising amount of the backup roll from the position. When raising the backup roll by giving a large crown to the lower part, the step between the raised backup roll and the non-elevated backup roll, concentrated load on the raised backup roll, between the leveling roll and the backup roll It is necessary to prevent the scratches that occur in.

As described above, by suppressing the rising amount of the backup roll from both sides in the width direction with respect to the rising amount of the backup roll from the center position in the width direction, the roll profile can be adjusted and the load distribution can be balanced. It is possible to prevent a step or a scratch from occurring. Further, the amount of eccentricity is proportional to the correction force, and is actually determined by measuring the degree of deformation of the lower roll frame.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a roller leveler 1 according to the first embodiment, and the roller leveler 1 is
The material to be straightened (steel plate) is passed between the upper and lower leveling rolls 2 and 3 to straighten the material to be straightened. The upper and lower leveling rolls 2 and 3 are backed up by upper and lower backup rolls 4 and 5, respectively. The lower backup roll 5 is supported by the lower roll frame 6,
A lower frame 7 is arranged below the lower roll frame 6. The upper backup roll 4 is supported by an upper roll frame 8, and the upper roll frame 8 is provided with an upper crowning device including a direct acting hydraulic cylinder 9 or a direct acting hydraulic jack. The schematic structure of this roller leveler 1 is shown in FIG.
The same as 01.

As shown in FIG. 2, the lower backup roll 5 is divided into a plurality of pieces in the width direction of the pass line, and a plurality of pieces are arranged in the passage direction of the material L to be straightened. The lower backup roll 5 is provided rotatably around the axis in the width direction. The upper backup roll 4 has the same structure. FIG. 3 is an enlarged view of the lower backup rolls 5 for the four width directions near the center X in the width direction of FIG. These lower backup rolls 5 are included in the backup rolls 5a and 5b.
A central crowning device 11 is provided for pushing up a and 5b to the lower leveling roll 3 side. If necessary, the lower backup roll 5a in the center in the width direction,
5b, 5a ', 5b' may be equipped with a crowning device, and the number thereof is not limited.

The central crowning device 11 provides a convex crown to assist rigidity near the center in the width direction.
An eccentric mechanism 12 for pushing up the lower backup rolls 5a and 5b is provided. As shown in FIG. 4, the eccentric mechanism 12 has an eccentric bush (rotating body) 15 that is eccentrically and rotatably provided with respect to the rotation center shaft 14 of the lower backup roll 5 a, and rotates the eccentric bush 15. Thus, the lower backup roll 5a is pushed up against the lower roll frame 6.

FIG. 4A shows a state in which the lower backup roll 5a is pushed up at the time of narrowing the width,
At the time of normal straightening shown in FIG.
eccentric bush 15 from the state where a is not pushed up)
Is rotated by 108 °, the lower backup roll 5a rises with respect to the lower roll frame 6. The raising margin C of the lower backup roll 5a can be set to 2 mm, for example. Further, the allowance for raising the lower backup roll 5a is adjustable and can be adjusted by adjusting the amount of eccentricity of the eccentric bush 15. If the amount of rotation of the eccentric bush 15 is suppressed, the raising allowance is also adjusted. However, if this happens, the roll center position will be displaced and this will adversely affect the rotation of the leveling roll, so 180 ° rotation is desirable.

FIG. 5 shows a gear mechanism for rotating the eccentric bush 15, which is for simultaneously raising the respective lower backup rolls 5a arranged in parallel in the sheet passing direction. This gear mechanism is provided coaxially with the eccentric bushes 15, 15, 15, ... Provided on the respective lower backup rolls 5a, 5a, 5a ... In the passing direction, and these eccentric bushes are provided. Drive gears 17, 17, 17, ... for rotating 15 and the drive gears 17, 17, 17 ,.
. And intermediate gears 19, 19 ...

When the motor 18, which is the drive source, is rotated, the drive gears 17, 1 are driven through the intermediate gears 19, 19 ,.
The rotation is transmitted to 7, 17, ..., The backup rolls 5a arranged in the sheet passing direction rise synchronously. Therefore, the lower backup roll 5a near the center in the width direction can likewise rise in the sheet passing direction. Also,
The lower backup roll 5b can also be lifted by a similar gear mechanism, and the backup rolls 5a and 5b divided in the width direction can independently move up and down.
If the number of eccentric rows is increased, a drive motor or the like may be added.

FIG. 6 shows six Ys from the center in the width direction of FIG.
The eccentricity profile of the lower backup roll 5 of FIG.
Is higher than the other lower backup roll 5 C = 2
mm rises and eccentric backup roll 5a
Is higher than the other lower backup rolls 5 by C '. As a result, a convex crown is positively provided near the center in the width direction, and the deflection at the pass line center due to the compressive deformation of the lower leveling roll 3, the lower backup roll 5, the lower roll frame 6, and the lower frame 7 is corrected. If necessary, eccentric backup roll 5
It is also possible to raise a ', 5b'.

Further, the central crowning device 11 is
It is also the lower crowning device of the present invention, and the compressive deformation of the lower reverisi roll 3 by the upper crowning device 9 is
The lower crowning device 11 lowers the pushing force to improve the leveling accuracy. The scale removing device 2 is attached to the lower roll frame 6 (lower unit 20) having the lower leveling roll 3 and the lower backup roll 5.
Two are provided. The scale removing device 22 is for removing the scale separated from the material to be straightened by the air flow in the straightening process by the roller leveler 1 and removing the scale between the lower backup rolls 5 and 5a adjacent to each other in the material passing direction. A nozzle 23 is provided for generating a fluid flow in the roll cylinder length direction. This nozzle is connected to an air compressor (not shown) by an air pipe or the like.

The nozzle 23 generates an air flow from the axial drive side end of the lower leveling roll toward the other end,
The scale is blown off to prevent the scale from accumulating on the drive side end. The upper roll frame 8 (upper unit 25) having the upper leveling roll 2 and the upper backup roll 4 can be similarly provided with a scale removing device. In addition to the nozzle 23, it is desirable to add a nozzle for preventing the scale from accumulating in the driving device of the lower crowning device.

As shown in FIG. 7, of the plurality of leveling rolls 3, 3, ... Arranged in the passing direction, two leveling rolls 3a, 3a, that is, the backup roll 5,
5, 5, ... When four rows are moved up and down by the central crowning device, and four backup rolls 5a-1, 5a-2, 5a-3, 5a-4 near the center in the width direction are raised. In this case, it is preferable to adjust the roll profile to balance the load distribution. That is, four (plural) backup rolls 5a-1, 5a-2, 5a
-3, 5a-4 are configured to be independently movable up and down, and backup rolls 5a-2, 5a near the center position
With respect to the amount of rise of -3, the amount of rise of the backup rolls 5a-1 and 5a-4 from both sides in the width direction is suppressed to reduce the step difference between the backup rolls 5 and 5 which have not risen,
By making the roll profile gentle, the backup rolls 5a-1, 5a-2, 5a-3, 5 raised
Since the concentrated load on a-4 is avoided and the load distribution is balanced, and the step difference with the backup rolls 5 and 5 that has not risen is small, it is possible to prevent scratches from occurring with the lower leveling roll 3. .

The raising margin C of each backup roll is, for example, the raising margin C1 of the backup roll 5a-1.
= 0.5 mm to 1.5 mm, backup roll 5a-
2 raising margin C2 = 1.0 mm to 3.0 mm, backup roll 5a-3 raising margin C3 = 1.0 mm to 3.0 m
m, raising margin of backup roll 5a-4 C4 = 0.5
It can be set to mm to 1.5 mm. Also, it is desirable to attach a chamfer to the end of the roll barrel in consideration of the unbalanced load on the backup roll itself.

Of the lower backup rolls 5, it is possible to move up and down by the eccentric mechanism 12 to any one to six lower backup rolls 5 near the center in the width direction. FIG. 9 shows a roller leveler 1 according to the second embodiment of the present invention. This roller leveler 1
Is the central crowning device (lower crowning device) 1
1, the liner 30 is provided at the center position in the width direction between the lower roll frame 6 and the lower frame 7, and the other points are the same as in the first embodiment.

The liner 30 is provided between the lower roll frame 6 and the lower frame 7 by a hydraulic cylinder 31 so that it can be inserted into and removed from the lower roll frame 6. The liner 30 is pushed upward with respect to the central position in the width direction. A convex crown is provided, and rigidity assistance is provided to the center position in the width direction of the roller leveler to prevent compressive deformation of the material to be straightened.
In addition, by providing a device similar to the scale removing device between the lower roll frame 6 and the lower frame 7,
It is possible to prevent scale from accumulating between the lower roll frame 6 and the lower frame 7.

FIG. 10 shows a roller leveler 1 according to the third embodiment of the present invention. This roller leveler 1 is provided with a wedge mechanism 35 as a central crowning device (lower crowning device) 11 at a widthwise central position between the lower roll frame 6 and the lower frame 7, and other points are the same as in the first embodiment. is there. The wedge mechanism 35 pushes out the upper wedge body 35a with respect to the lower wedge body 35b by a hydraulic cylinder 36.
By pushing in 5a, a convex crown that pushes up is given to the center position in the width direction.

FIG. 11 shows a roller leveler 1 according to the fourth embodiment of the present invention. While the central crowning device (lower crowning device) 11 of each of the roller levelers 1 of the first to third embodiments is a static crowning device, the fourth embodiment is a dynamic crowning device. That is, the central crowning device (lower crowning device) 11 is composed of a direct acting hydraulic cylinder 40 or a direct acting hydraulic jack arranged at a widthwise central position between the lower roll frame 6 and the lower frame 7.

The hydraulic cylinder 40 is operated to provide a convex crown that pushes upward at the center position in the width direction, so that the material to be straightened is prevented from being compressed and deformed. By providing a device similar to the scale removing device between the lower roll frame 6 and the lower frame 7, it is possible to prevent scale from accumulating between the lower roll frame 6 and the lower frame 7. be able to. The present invention is not limited to the above embodiment. For example, from the viewpoint of providing a convex crown at the center in the width direction, the central crowning device 11 according to the first to fourth embodiments does not have to be provided in the lower portion, but may be provided in the upper portion. That is, the upper crowning device 9 and the central crowning device 11 in each embodiment may be arranged upside down.

Further, the upper crowning device 9 in each embodiment may employ the wedge mechanism 35 as in the third embodiment instead of the hydraulic cylinder. Also, the first
The rotation center axis 1 of the backup roll 5 as in the embodiment
In order to move 4, the eccentric mechanism 12 may be replaced by an appropriate mechanism such as a member for supporting the backup roll 5 having a shim interposed therein to raise the position of the backup roll 5.

[0030]

According to the present invention, by providing the central crowning device, a convex crown larger than both sides in the width direction is provided in the vicinity of the center in the width direction, and rigidity is assisted in the vicinity of the center in the width direction. Can be corrected and the correction ability can be improved. Further, by providing the lower crowning device, the compressive deformation of the lower portion of the roller leveler is reduced, and it is possible to secure the flatness and the deviation in the width direction in the correction by the roller leveler.

[Brief description of drawings]

FIG. 1 is a front view of a roller leveler according to a first embodiment.

FIG. 2 is a plan view of a backup roll.

FIG. 3 is a partially enlarged plan view of a backup roll.

FIG. 4 is a schematic side view showing an eccentric mechanism of a lower roll frame, FIG. 4 (a) shows a narrow correction (when a backup roll is raised), and FIG. 4 (b) shows a normal correction. .

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an eccentric profile of a backup roll.

FIG. 7 is a perspective view for explaining an eccentric profile according to another example.

FIG. 8 is a front view (view B in FIG. 7) for explaining an eccentric profile according to another example.

FIG. 9 is a side view of the roller leveler according to the second embodiment.

FIG. 10 is a side view of a roller leveler according to a third embodiment.

FIG. 11 is a side view of a roller leveler according to a fourth embodiment.

FIG. 12 is a side view of a conventional roller leveler.

FIG. 13 is a perspective view showing a compression deformation state of a conventional roller leveler.

[Explanation of symbols]

1 Laura Leveler 2 Upper leveling roll 3 Lower leveling roll 4 Upper backup roll 5 Lower backup roll 6 Lower roll frame 7 lower frame 9 (Upper) crowning device 11 Central crowning device (lower crowning device) 12 Eccentric mechanism 14 axis (rotation center axis) 15 Eccentric bush (rotating body) 20 Lower unit 22 Scale remover

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nou Fumihide             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Toru Aoyama             Sumitomo Heavy Industries, No. 5, Soukai-cho, Niihama-shi, Ehime Prefecture             Mechanical Industry Co., Ltd. Niihama Works (72) Inventor Keizo Abe             Sumitomo Heavy Industries, No. 5, Soukai-cho, Niihama-shi, Ehime Prefecture             Mechanical Industry Co., Ltd. Niihama Works (72) Inventor Kazutoshige             Sumitomo Heavy Industries, No. 5, Soukai-cho, Niihama-shi, Ehime Prefecture             Mechanical Industry Co., Ltd. Niihama Works F-term (reference) 4E003 AA02 BA02 BA12

Claims (6)

[Claims] 1. A leveling roll (2, which is paired up and down).
3) A roller leveler for straightening the material to be straightened (L) through the material to be straightened (L) between them, and upper and lower backup rolls (4, 5) for backing up the upper and lower leveling rolls (2, 3), respectively. , A crowning device (9) for applying a roll crown from one side (4) of the upper and lower backup rolls (4, 5), and a center for providing a convex crown near the widthwise center of the other backup roll (5) A roller leveler comprising a crowning device (11). 2. The backup roll (5) is configured by being divided in the width direction, and the central crowning device (11) is located near the center in the width direction among the backup rolls (5) divided in the width direction. Roller leveler according to claim 1, characterized in that the ones located (5a, 5b, 5a ', 5b') are configured to push up the leveling roll (3). 3. The central crowning device (11) comprises:
Backup roll (5) divided in the width direction
Located near the center in the width direction (5a, 5b, 5
a ', 5b') is provided with an eccentric mechanism (12), and the eccentric mechanism (12) includes the backup roll (5).
a, 5b) has a rotating body (15) mounted eccentrically with respect to the axial center (14) of the backup roller (5a, 5b) by rotating the rotating body (15).
The roller leveler according to claim 1 or 2, wherein b) is configured to be movable up and down. 4. Leveling rolls (2
3) A roller leveler for straightening the material to be straightened (L) through the material to be straightened (L) between them, and upper and lower backup rolls (4, 5) for backing up the upper and lower leveling rolls (2, 3), respectively. An upper crowning device (9) for imparting a roll crown from the upper backup roll (4) side, and the lower backup roll (5) for correcting the compressive deformation of the lower part by the upper crowning device (9). Lower crowning device for applying crown from side (11)
Laura leveler characterized by having. 5. A material (L) to be straightened by generating a fluid flow in a lower roll frame (20) having the lower leveling roll (3) and the lower backup roll (5).
The roller leveler according to claim 4, further comprising a scale removing device (22) for removing the scale separated from the surface and for purging the driving part of the lower crowning device (11) so that the scale does not enter. . 6. The lower crowning device (11) comprises:
Backup roll (5) divided in the width direction
Among these, a plurality of backup rolls (5a-1, 5a-2, 5a-3, 5a-4) near the widthwise central position are raised to provide a crown, and the backup rolls from the widthwise central position are provided. (5a-2,
The load distribution can be balanced by suppressing the rising amount of the backup rolls (5a-1, 5a-4) from both sides in the width direction with respect to the rising amount of 5a-3). The roller leveler according to 4 or 5.