JPH0233444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a roll bending device in a roller straightening machine.

<Prior art> Generally, plate products rolled by a rolling mill are usually
During rolling or cooling, the internal residual stress distribution of the plate becomes uneven due to the steelmaking and rolling process, as well as uneven temperature distribution, in the longitudinal and width directions of the plate, resulting in elongation or curling in the plate. It has drawbacks such as the generation of local distortions such as waves and one-sided waves, and as the width and thickness of the plate increases, this becomes a bigger problem in processing the product plate.

It is necessary to correct the distortions in these plate materials in a hot or cold state, and various types of roller straightening machines (hereinafter referred to as roller levelers) are used as a means for correcting the distortions. These roller levelers use multiple rollers that are arranged in a staggered manner vertically along the direction of travel, sandwiching the processed material, and repeatedly bending the material in the vertical direction while passing through the material, making the curvature of each part of the material uniform. After this, the curvature is reduced to zero, thereby correcting the distortion of the plate and removing residual stress.

Figures 1a and 1b are schematic functional explanatory diagrams showing the roll bending mechanism in a roller leveler having a conventional roll bending device, in which a is a front view of a roll bending device using a three-part wedge system, and b is an A of a. - This is a sectional view taken along the line A, in which a plurality of work rolls 3, 3' and back-up rolls 4, 4' are arranged in a staggered manner at the top and bottom of the housing 1, sandwiching the processing material 2, respectively. A plurality of rows of upper back-up roll groups 4 made up of a plurality of short-body long rolls 4a are fixed to one frame 105, and lower back-up roll groups 4' are fixed to one frame 105.
similarly consists of a plurality of short-length rolls 4a, and three independent frames 106a, 106.
b, 106c, with equal intervals maintained.

The upper surface of each frame 106a, 106b, 106c is the bearing part 107a, 107 of the short body long roll 4a.
b, 107c and the roll axial cross-sections are in self-aligning contact with the opposing uneven cylindrical surfaces, and the lower surfaces form inclined surfaces on which the plate advancing cross-sections face each other,
It is supported on the housing 1 at three locations via a pair of wedges 112a and 112b that slidably abut on these surfaces, respectively. Therefore, by driving the wedges 112a, 112b at three locations, for example, by the common threaded shaft 20, each of the lower back-up roll frames 106a, 106b, 10
6c can freely move up or down, and
Self-aligning movement is possible in the roll axis direction, and a predetermined bend is given to the lower work roll 3' in response to the reaction force of the plate material, so that distortion in the width direction of the plate material 2 can be corrected. In the figure, 14 and 14' are roll reduction devices, 15 is a roll balance device, arrow X indicates the direction of movement of the plate material 2, and FIG. The bending state of the roll 3' is shown.

<Problems to be Solved by the Invention> By the way, in the conventional method described above, the roll bending mechanism has a wedge-type sliding part, and a large amount of cooling water is used when straightening the plate material in a hot state. I will do it. Therefore,
Operating in an atmosphere of water vapor, mill scale, etc. can lead to damage and malfunction due to corrosion of each sliding surface, foreign matter getting caught, etc., as well as increased housing height and difficulty in operation. There was a problem.

The present invention was proposed in order to solve such conventional problems, and it corrects the shape of a plate material with uneven yield point distribution in the longitudinal direction and width direction over the entire area of the plate material in a roller leveler, and corrects the shape defect. It is an object of the present invention to provide a roll bending device for a roller straightening machine for the purpose of obtaining sheet products with a flat shape.

<Means for Solving the Problem> Therefore, in the present invention, in order to solve this problem, a plurality of work rolls are arranged vertically in a staggered manner with the processed plate material in between, and a plurality of work rolls are arranged above and below the work rolls. In a roller straightening machine equipped with a plurality of back up rolls made up of short length rolls arranged on the same axis, a frame equipped with a group of back up rolls that abuts either the upper or lower work roll. A frame divided into two or three parts in the axial direction, a horizontal shaft rotatably connecting the frames to each other, and a concentric shaft and an eccentric shaft connecting the frames. In order to displace the relative angle between the connecting member and the frame,
The present invention proposes a roll bending device characterized by comprising an eccentric shaft drive means for rotationally driving the eccentric shaft via a lever.

<Operation> According to the roll bending device according to the present invention, the relative angle between the frames is changed by rotationally driving the eccentric shaft via the lever by the eccentric shaft driving means. As a result, the pressing force of the backup roll group provided on each frame against the work roll also changes, and distortion in the width direction at any position of the processed plate material is corrected.

<Example> Two examples of the present invention will be specifically described based on FIGS. 2 and 3.

FIG. 2a is a front view showing a cross section at the center of the roll shaft of a roller straightening machine according to the first embodiment of the present invention, and FIG. 2b is a sectional view taken along the line B--B in FIG. 2a. still,
The same members corresponding to the conventional structure will be described with the same reference numerals.

As shown in the figure, in the roller straightening machine of this embodiment, a plurality of work rolls 3, 3' and back-up rolls 4, 4' are arranged in a staggered manner in the upper and lower parts of the housing 1, respectively, with the processed plate material 2 sandwiched therebetween. It is set up. Each back-up roll 4, 4' is made up of a plurality of short-length rolls arranged at approximately equal intervals on the same axis, and the lower back-up roll group 4' is
Each roll is rotatably mounted on one common frame 5. Further, the above-mentioned backup roll group 4 has two areas 4a, which are equally spaced in the roll axis direction.
4b, and each section is mounted on frames 21a and 21b that can integrally move up and down along the guide of the housing 1. Each frame 21a, 21b is rotatably supported by a horizontal shaft 7 provided horizontally and parallel to the traveling direction X of the plate material at a lower adjacent portion thereof. Further, an eccentric shaft 8 is provided on the upper part of one frame 21b, and an eccentric shaft 8 is provided on the upper part of one frame 21b, and
A concentric shaft 9 is provided in the upper part of 1a so as to be rotatable and parallel to the horizontal shaft 7, and furthermore, both ends of the eccentric shaft 8 and the concentric shaft 9 are connected to a pair of connecting rods 10, 10, respectively, which are a pair of connecting members. It is rotatably pin-jointed via '.

The eccentric shaft 8 is connected to the frame 21b via the lever 11.
It is connected to a jack 12, which is an eccentric shaft drive means that operates in the horizontal direction and is mounted on the shaft. Therefore, by operating this jack 12, both frames 21a and 21b are relatively rotated about the horizontal shaft 7 with which they are engaged. Further, a pair of compression coil springs 13, 13' are buried in the upper parts of both frames 21a, 21b, and connecting rods 10, 1 are connected to each frame 21a, 21b.
0' and the horizontal shaft 7 to ensure smooth transmission. In the figure, numerals 14 and 14' denote roll lowering devices, and numeral 15 denotes a roll balance device.

The operation of the device configured in this way will be explained below. First, when correcting the ear wave which is a defective shape of the plate material 2, it is only necessary to correct the central part of the plate 2, so that the jack 12 can be retracted. Then, the eccentric shaft 8
The center of the frame moves outward, but since the eccentric shaft 8 is connected to the concentric shaft 9 via the connecting rods 10 and 10', both frames 21a and 21b rotate inward with the horizontal shaft 7 as a fulcrum. move. As a result, the back-up roll groups 4, 4' can be bent by a predetermined amount. Next, the reduction device 1
When the frames 21a and 21b are lowered by a predetermined amount by 4 and 14', both ends of the upper work roll 3 escape upward due to the reaction force of the plate material 2, and the central part of the plate material is corrected, correcting the wave of the plate. be able to.

Further, when correcting mid-elongation, which is a defective shape of the plate material, the jack 12 is pushed out in the opposite direction to that for ear wave correction. Then, by the reverse operation of the above-mentioned operation, both ends of the upper work roll 3 are bent downward, so that both ends of the board width can be corrected, and it becomes possible to correct the mid-elongation.

In addition, in the present invention, the device that performs the above operation is as follows:
The upper back-up roll group 4 is divided into two, and the lower back-up roll group 4' is divided into one common frame 5.
Although we have explained the case in which the lower back-up roll group 4' is attached to the top, it is also possible to divide the lower back-up roll group 4' into two and attach the upper back-up roll group 4 to one common frame, and the same effect can be obtained. is obtained.

As described above in detail based on the first embodiment shown in FIG. 2, according to the present invention, either the upper or lower backup roll group is equally divided into two in the axial direction, Each roll group is attached to a frame divided into two parts, and the frame is made rotary, which eliminates damage to the equipment caused by water vapor, mill scale, and other adverse atmospheres during hot straightening, which is a disadvantage of the conventional wedge method. Along with being resolved,
The housing height can be reduced and operability improved.
Furthermore, since the mechanism is simplified, manufacturing costs are also reduced. The two-part type of the first embodiment has a very remarkable effect especially in straightening work when the width of the plate is narrow.

On the other hand, FIG. 3 shows a second embodiment of the present invention. Figure 3 a and b are respectively Figure 2 a and b
corresponds to

As shown in the figure, the roller straightening machine of this embodiment shows the case where the above-mentioned back-up roll group is divided into three parts. In the case of the two-division system for the back-up roll group, the amount of bending cannot be increased compared to the three-division system due to the strength of the rolls.Especially when the width of the board increases, it is difficult to uniformly straighten the rolls within the division. Possible problems include not having enough wear allowance. In order to solve these problems, a method was proposed in which the backup roll group is divided into three parts, especially when the board width is wide. Incidentally, since the configuration is basically the same as that of the two-division method described above, explanations of corresponding identical parts and members will be omitted.

The upper back-up roll group 4 has three areas 4a, 4 spaced equally or unevenly apart in the roll axis direction.
It is divided into frames 6a, 4c, and each section is attached to a frame 6a, 6b, 6c that can integrally move up and down along the guide of the housing 1. The frames 6a, 6b, 6c are rotatably supported by horizontal shafts 7a, 7b arranged horizontally and parallel to the traveling direction X of the processing plate material 2 at their lower adjacent portions. Eccentric shafts 8a, 8b are provided at the top of both outer frames 6a, 6c, and a pair of concentric shafts 9a, 9b are provided at the top of the central frame 6b, parallel to horizontal shafts 7a, 7b, respectively, and are rotatable. It is installed through the. Moreover, the mutually adjacent shafts 8a and 9a
and 8b, 9b are rotatably pin-jointed via a pair of connecting rods 10a, 10a' and 10b, 10b', respectively, and the eccentric shafts 8a, 8b are connected to each outer frame via levers 11a, 11b, respectively. It is connected to a pair of horizontally operating jacks 12a, 12b mounted on the wheels 6a, 6c. By operating these jacks 12a and 12b, both outer frames 6a and 6c are configured to rotate in opposite directions about horizontal shafts 7a and 7b that are engaged with each other, respectively. Further, on the upper portions of the three frames 6a to 6c, adjacent frames are pressed to eliminate gaps between each frame 6a to 6c and the connecting rods 10a to 10b' and the horizontal shafts 7a and 7b and to smooth transmission. Each pair of compression springs 13a, 13a', 13b, 13b' is embedded.

The operation of the device configured in this way will be explained below. First of all, if you want to correct the ear wave, which is a defective shape of the board, you can correct the center of the board.
The jacks 12a and 12b can be respectively retracted. Then, the centers of the eccentric shafts 8a, 8b move outward from each other, and since these shafts are pivotally supported by the connecting rods 10, 10', respectively, the left and right outer frames 6a, 6
c rotates inward with respect to the horizontal shafts 7a and 7b as fulcrums. As a result, back-up roll group 4,
4' can be bent. next,
All frames 6a, 6 are removed by the lowering devices 14, 14'.
When b and 6c are respectively rolled down by a predetermined amount, both ends of the upper work roll 3 escape upward due to the bending reaction force of the plate material 2, thereby correcting the center portion of the plate 2 and correcting the ear wave of the plate. In addition, when correcting the elongation in the board, use the jacks 12a, 12b.
Push out in the opposite direction to the above operation. Then, both ends of the work roll 4 are bent downward, and both ends of the width of the board can be corrected, thereby correcting the elongation in the middle.

As explained above in detail based on the drawings,
A second embodiment of the invention divides the backup roll group into three axially evenly or unevenly spaced sections. Therefore, by dividing the wide processed plate material 2 into areas of appropriate dimensions corresponding to the size range, it is possible to process material with a much wider range of plate widths than with the conventional three-part equal division method or the two-division method described above. On the other hand, it is possible to always uniformly correct distortion at any position in the width direction, and it is possible to provide a very economical equipment.

In addition, the three-division method according to the present invention can be used, for example, depending on the thickness
It is particularly effective for wide thick plates such as 30 mm and width 5000 mm, and since the roll bending device is a frame rotation type, various drawbacks of the conventional wedge method are also eliminated.

<Effects of the Invention> In summary, according to the present invention, a roll bending device that uses a two-split system for correcting distortion in a narrow board width, and a roll bending system that uses a three-part equally or unevenly split system for correcting a wide board width, is appropriately selected. By adopting this method, it is possible to correct shape defects such as ear waves, elongation, waves, etc., which have uneven yield point distribution in the longitudinal and width directions of the plate material, and it is possible to correct flatness without shape defects. There are effects such as being able to obtain shaped plate products.

[Brief explanation of drawings]

Figure 1 shows a conventional wedge-type roll bending device, where a is a front view and b is a front view of the roll bending device.
2 shows a roller straightening machine according to the first embodiment of the present invention, a is a front view showing a central cross section of the roll shaft, and b is a BB sectional view of a. , FIG. 3 shows a second embodiment of the roller straightening machine of the present invention, in which a is a sectional view at the center thereof, and b is a sectional view taken along line C-C of a. In the drawings, 1 is a housing, 2 is a treated plate material, 3,
3' is a work roll, 4, 4' are backup rolls, 5 is a common frame, 6a, 6c are outer frames, 6b is a central frame, 7 is a horizontal axis, 8 is an eccentric axis, 9 is a concentric axis, 10, 10 ', 10a, 10b,
10a', 10b' are connecting rods, 11, 11a, 11b
is the lever, 12, 12a, 12b is the jack, 1
3, 13' are compression springs, 14, 14' are roll lowering devices, 15 are roll balance devices, 21a, 21
b is a frame.

Claims (1)

[Claims] 1. A plurality of work rolls are arranged in a staggered manner vertically with a processed plate material in between, and a plurality of short-length rolls are arranged on the same axis above and below the work rolls. In a roller straightening machine equipped with a plurality of back-up rolls, the frame is equipped with a group of back-up rolls that come into contact with either the upper or lower work rolls, and is divided into two pieces near the center in the axial direction. a horizontal shaft that rotatably connects the two frames; a connecting member that connects the frames via a concentric shaft and an eccentric shaft; and a connecting member that displaces the relative angle between the frames. 1. A roll bending device for a roller straightening machine, comprising an eccentric shaft drive means for rotationally driving the eccentric shaft via a lever. 2. A plurality of back-up rolls in which a plurality of work rolls are arranged vertically in a staggered manner with a processed plate material in between, and a plurality of short-length rolls are arranged on the same axis above and below the work rolls. A roller straightening machine equipped with a frame having a group of back-up rolls that abuts either the upper or lower work rolls, the frame being divided into three parts in the axial direction into a central frame and two outer frames. a frame, a horizontal shaft rotatably connecting the central frame and both outer frames, and a connecting member connecting the central frame and both outer frames via a concentric shaft and an eccentric shaft; A roll bending device for a roller straightening machine, comprising eccentric shaft driving means for rotationally driving the eccentric shaft via a lever in order to displace the relative angle between the central frame and both outer frames.