JPH09308913A - Unequal pitch type roller leveler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height of residual camber after leveling in a roller leveler for straightening camber caused at top and rear ends of a metal plate after hot rolling. SOLUTION: A group of lower rollers 1, 3 are moved in the advancing direction of the metal plate 5 from the position of equal pitch to a groups of upper rollers 2, 4 and respective distances in the advancing direction of the metal plate between the upper and lower rollers 1, 3 and 2, 4 which are opposed to each other are made smaller than a half of the roller pitch. Thus, the leveling of the upward camber generated at the top end of the metal plate 5 is executed with the rollers 2, 3, 4 and the leveling of the downward camber generated at the rear end is executed with the rollers 1, 2, 3 by their inverse bending action, so leveling of the small amount of the residual camber is possible. In this way, the threading of plate in a heating or cooling device for heat treatment is facilitated and uniform heat treatment is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller leveler for correcting warpage of a plate material, and more particularly to a roller leveler for leveling the plate material straight before the heat treatment when the plate material produced by hot rolling is heat-treated online. The present invention relates to an online heat treatment apparatus equipped with the roller leveler.

[0002]

2. Description of the Related Art A method in which a plate material having a high temperature of about 1000.degree. C. is hot-rolled by a rolling mill and immediately subjected to a heat treatment for supplementary heating and soaking of the plate material by a temperature adjusting device is a preferable manufacturing method from the viewpoint of energy saving. Has been attracting attention as.

Further, generally, the bending of the plate material hot-rolled by the rolling mill in the longitudinal direction is such that the leading end of the plate material is warped and the tail end thereof is warped. This is caused by a general rolling method that is used to prevent the front end of the plate material from violently colliding with the table roller when passing through the rolling mill.

In the advance of the above-mentioned online heat treatment, it is necessary to correct this bend in advance. That is,
This is because if the front and rear ends of the plate material are warped abnormally, not only it is difficult to pass the plate material in the temperature adjusting device, but also the heat treatment effect is not uniform. In general, the temperature adjusting device and the cooling device have a narrow space for passing heat in order to improve the heat treatment effect. Therefore, it is necessary to perform leveling of the plate material before supplying the plate material to the temperature adjusting device.

For leveling, a roller leveler in which a large number of rollers are arranged in a staggered pattern is generally used.

By the way, a large amount of scale adheres to the surface of the plate material hot-rolled by the rolling mill, and when the scale is passed through the roller leveler, a part of the scale is transferred to the roller. For this reason, if a four-level roller leveler is used, the scale transferred to the roller is caught between the leveler roller and the reinforcing roller, and the surface of the leveler roller is roughened, which necessitates frequent replacement of the roller. For this reason, it is necessary to use a two-stage roller leveler without a reinforcing roller as a roller leveler for online heat treatment, and in the two-stage type roller leveler, the leveler roller has a large diameter to ensure strength.

Further, in the conventional roller leveler, one of the upper and lower rollers is shifted by a half pitch with respect to the other, and the rollers are arranged at an equal pitch.

In a four-step roller leveler that corrects the plate shape such as medium elongation and edge elongation of the plate material, the lower leveler roller is shifted to the upstream side in the line direction with respect to the upper leveler roller in order to expand the correction ability. A pitch arrangement is proposed in JP-A-60-250824.

[0009]

As described above, in the on-line heat treatment apparatus, it is necessary to perform leveling of the plate material before feeding the plate material to the online heat treatment apparatus. In general, for leveling, a large number of rollers are staggered. The roller leveler used for the on-line heat treatment apparatus is required to be a two-stage roller leveler using a large-diameter roll without a reinforcing roller due to the problem of scale biting.

By the way, in the two-stage type roller leveler, since the rollers have a large diameter, the roller pitch is inevitably long.

For example, the plate thickness of the plate material to be treated is usually 20.
The plate width is 600 to 2000 mm at -40 mm. The diameter of the roller of the two-stage roller leveler for leveling such a plate material is about φ350 to φ400 mm.
The roller pitch Lp of each lower roller is 450 to 500
mm.

In the conventional roller leveler, one of the upper and lower rollers is arranged with an equal pitch in which one of the upper and lower rollers is shifted by a half pitch with respect to the other. Therefore, this is used in an on-line heat treatment apparatus, and bending defects occur at the front and rear ends after hot rolling. When the plate member having the above is straightened, about half the length of the roller pitch Lp becomes an uncorrected band at each of the front and rear ends of the plate member, and a warp defect remains. At this time, as described above, the roller pitch L
Since p is long, the uncorrected body also becomes long and the residual warp height becomes large. In the case of the strictest warp, the curvature radius R of the warp is about 350 mm, but the roller pitch Lp is 5
If it is 00 mm, the residual warp height H after leveling is H
≈Lp ² /32R=22.3 mm.

Further, when the unequal pitch type roller leveler proposed in Japanese Patent Laid-Open No. 60-250824 is used to correct the warp at the front and rear ends of a plate material after hot rolling, it is a four-step type. Therefore, not only is there a problem of biting of the scale, but the roller pitch Lp corresponding to the distance in the plate material traveling direction between the lower roller and the upper roller at each of the front and rear ends of the plate material.
The above length portion becomes an uncorrected band, and the residual warp height after leveling increases conversely (see FIG. 9: described later).

A first object of the present invention is to provide a roller leveler which reduces the residual warp height after leveling the front and rear ends of a plate material.

A second object of the present invention is to provide an on-line heat treatment apparatus in which the plate material can be easily passed and the heat treatment effect is uniform.

[0016]

[Means for Solving the Problems]

(1) In order to achieve the first object, the present invention arranges a plurality of upper and lower rollers including a first and a second upper roller and a first and a second lower roller in a zigzag pattern, and In a roller leveler that repeatedly bends a plate material by a roller to correct the warp of the plate material, the plurality of upper and lower rollers are a first lower roller, a first upper roller, and
A second lower roller and a second upper roller are arranged in this order, and the distance between the first upper and lower rollers in the plate material advancing direction and the distance between the second upper and lower rollers in the plate material advancing direction are the first and the second roller. The upper roller and the first and second lower rollers each have a roller pitch smaller than half the roller pitch.

When the upper and lower rollers are arranged in the order of the first lower roller, the first upper roller, the second lower roller and the second upper roller in the traveling direction of the plate material, the warp of the tail end of the plate material is warped. Is corrected by three rollers, a first lower roller, a first upper roller, and a second lower roller on the upstream side, and the warp of the tip of the plate material is the first upper roller, the second lower roller, and the second lower roller. It is corrected by 3 rollers of 2 upper rollers.

When the warp of the tail end of the plate material is corrected by the first lower roller, the first upper roller and the second lower roller,
The tail end is re-bent in the opposite direction at the distance a between the first lower roller and the first upper roller. At this time, the tail end of the plate material is re-bent in the opposite direction at the distance a at the tail end of the plate material. Before the end reaches the first lower roller, and after reaching the first lower roller, the tail end does not contact the first lower roller and does not bend. That is, the portion corresponding to the distance a from the end of the tail end of the plate material becomes a warped uncorrected band.

When the warp of the tip of the plate material is corrected by the first upper roller, the second lower roller and the second upper roller,
The tip is bent again in the opposite direction at the distance a between the second lower roller and the second upper roller. At this time, the tip of the plate is bent again in the opposite direction at the distance a because the end of the tip of the plate is After reaching the second upper roller, before reaching the second upper roller, the tip does not bend because it does not contact the upper roller.
That is, the portion corresponding to the distance a from the end of the tip of the plate material becomes a warped uncorrected band.

In the present invention configured as described above, the distance a between the first lower roller and the first upper roller and the distance a between the second lower roller and the second upper roller are as described above. Each of them is shorter than 1/2 of the roller pitch Lp.
Therefore, the uncorrected belt is also 1/2 of the roller pitch Lp.
It becomes shorter and the residual warp height remaining in the uncorrected band after leveling can be reduced.

(2) In the above (1), preferably,
The lower roller group including the first and second lower rollers is movable in the plate material advancing direction from an equal pitch position with respect to the upper roller group including the first and second upper rollers, and the first upper and lower The distance between the rollers and the distance between the second upper and lower rollers are made variable.

In the present invention thus constructed, when the plate thickness of the plate material is thin, the warp at the front and rear ends is large. Therefore, the distance a is reduced accordingly, and when the plate thickness of the plate material is large, the warp also occurs. Since it is small, the distance a is increased accordingly.
By thus changing the distance a depending on the size of the plate thickness, the residual warp height can be always minimized and the leveling load can be reduced.

(3) Further, in order to achieve the above second object, the present invention immediately supplies a high temperature plate material hot-rolled by a rolling mill to a temperature control device to supplementally heat the plate material. In the on-line heat treatment apparatus for uniform heating, a two-stage roller leveler for rectifying the warp of the front end and the tail end of the hot-rolled plate material is arranged on the inlet side of the temperature adjusting device. The roller leveler of (1) above is used.

By arranging the roller leveler of the above (1) as the two-stage roller leveler of the online heat treatment apparatus, the plate material in the temperature adjusting apparatus can be smoothly threaded and the heat treatment effect becomes uniform.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
This will be described below.

In FIG. 1, the high-temperature plate material 5 hot-rolled by the rolling mill of the previous process is guided by the guide 18 and the entry side guide roller 23, and the unequal pitch type roller leveler 9 of the present invention is provided.
Be led to. The roller leveler 9 has a stand 10, and inside the stand 10, a pinch roller 17 composed of a pair of rollers which are vertically stacked on the entrance side, two lower leveler rollers 1, 3 and two upper leveler rollers 2, 4 are provided. Is stored.

The upper roller of the entrance side pinch roller 17 is moved up and down by a cylinder 16 provided in the intermediate frame 13. That is, when the warp of the tip of the plate member 5 is large, it is difficult to bite the leveler roller 1 to 4. In such a case, the tip end of the plate member 5 guided by the entrance side guide 18 is moved to the pinch roller 1
After guiding the upper roller 7 in the open state, the upper roller is closed by the cylinder 16 and the plate material 5 is guided to the leveler rollers 1 to 4 in the pinched state.

The leveler rollers 1 to 4 are arranged in the order of the lower roller 1, the upper roller 2, the lower roller 3 and the upper roller 4 in the traveling direction of the plate member 5.

Further, the leveler rollers 1 to 4 are arranged such that the lower rollers 1 and 3 are moved with respect to the upper rollers 2 and 3 from the equal pitch position in the traveling direction of the plate material 5 (right side in the drawing). Therefore, as shown in FIG. 2, when the roller pitch of each of the lower rollers 1 and 3 and the upper rollers 2 and 4 is Lp, the distance a between the upper and lower rollers 1 and 2 in the plate material traveling direction and the upper and lower rollers 3 and 4 are set. The distance a in the plate material traveling direction is less than half (Lp / 2) of the roller pitch Lp.

For example, the roller pitch Lp is usually 450 to
It is about 500 mm. On the other hand, the distance a between the centers of the lower roller 1 and the upper roller 2 and the distance a between the centers of the lower roller 3 and the upper roller 4 are set to about 130 to 160 mm, respectively.

Further, in FIG. 1, each roller of the pinch roller 17 and the leveler rollers 1 to 4 are supported by respective bearing boxes 21. Furthermore, the upper leveler roller 2,
The bearing box 21 for supporting 4 is operated by the operation of an actuator (not shown) by a worm jack 15 provided on the intermediate frame 13, and the amount of reduction of the upper leveler rollers 2, 4 with respect to the plate member 5 can be set freely.

The intermediate frame 13 is rapidly moved up and down by the cylinder 11 provided on the stand 11, and all the upper rollers can be rapidly moved forward and backward with respect to the plate member 5.
The leveled plate material 5 is provided on the exit side guide 25 and the roller 2.
It is led to 0, and it is led to the heat treatment apparatus of the next step.

FIG. 3 shows an online heat treatment apparatus of the present invention incorporating the above-mentioned roller leveler.

In FIG. 3, a roller leveler 9 and a temperature adjusting device 6 are provided on the downstream side of the rolling mill 8, and an on-line heat treatment device provided with a cooling device 7 is arranged if necessary.

The high temperature plate material 5 around 1000 ° C. is rolled by the rolling mill 8
Is hot-rolled, and then immediately guided to the online heat treatment apparatus of the present invention without being cooled to room temperature.

Further, in an example of a rolling line for producing thinner sheet materials, when the sheet material is soaked by supplementary heating of the sheet material by the temperature adjusting device 6 of FIG. There is also.

The bending of the plate material 5 hot-rolled by the rolling mill 8 in the longitudinal direction is as shown in FIG.
Has a warp shape and the tail end 5b has a warp shape. This is caused by a general rolling method that is used to prevent the front end of the plate material 5 from violently colliding with the table roller when passing through the rolling mill 8. In this way, the plate material 5
If the front and rear ends 5a, 5b are abnormally warped, not only is it difficult to pass the plate material in the temperature adjusting device 6 and the cooling device 7, but also the problem that the heat treatment effect is not uniform. Generally, the inside of the temperature adjusting device 6 and the cooling device 7 has a narrow passage space for improving the heat treatment effect.

Therefore, when the plate material 5 is guided to the online heat treatment apparatus, the plate material 5 is leveled by the roller leveler 9 before being supplied to the temperature adjusting device 6.

The operation of the roller leveler 9 of the present invention will be described with reference to FIGS.

The tail end 5b of the plate member 5 shown in FIG. 4 is a warp, and the warp of this tail end 5b is corrected by the three rollers 1, 2, 3 shown in FIG. 5, and the plate member 5 shown in FIG. Tip 5
Reference numeral a is an upward warp, and the upward warp of the tip 5a is corrected by the three rollers 2, 3 and 4 shown in FIG.

The warp of the tail end 5b of the plate member 5 is the roller 1,
When straightened by 2 and 3, the tail end 5b is bent again in the opposite direction at the distance a between the lower roller 1 and the upper roller 2. It is caused by bending the plate material between the rollers 1, 2 and 3 at this time,
The relationship between the bending moment M and the curvature K is as shown in FIG. 7, and the reduction of the upper roller 2 is set so that the curvature K becomes zero when the tail end 5b of the plate material passes the roller 3.

The warp of the tip 6 of the plate member 5 is caused by the rollers 2, 3,
When straightened by 4, the tip 5a is re-bent in the opposite direction by the distance a between the lower roller 3 and the upper roller 4. The relationship between the bending moment M and the curvature K generated by bending the plate material between the rollers 2, 3 and 4 at this time is as shown in FIG.
Also in this case, the reduction of the upper roller 4 is set so that the curvature K becomes zero when the tip 5a of the plate material passes through the roller 4.

Here, the tail end 5b of the plate member 5 is re-bent in the opposite direction at the distance a between the lower roller 1 and the upper roller 2 until the end of the tail end 5b of the plate member 5 reaches the lower roller 1. Therefore, after reaching the lower roller 1, the tail end 5b does not contact the lower roller 1 and does not bend. That is, the tail end 5 of the plate material 5
The portion corresponding to the distance a from the end of b is the warped uncorrected band.

The tip 5a of the plate material 5 is re-bent in the opposite direction at the distance a between the lower roller 3 and the upper roller 4 so that the plate material 5 is bent.
This is after the end of the tip 5a reaches the upper roller 4, and before reaching the upper roller 4, the tip 6 is not bent because it is not in contact with the upper roller 4. That is, the portion corresponding to the distance a from the end of the tip 5a of the plate material 5 becomes a warped uncorrected band.

In the present invention, the distance a between the lower roller 1 and the upper roller 2 and the distance a between the lower roller 3 and the upper roller 4 are respectively 1/2 of the roller pitch Lp as described above.
Making it shorter. Therefore, the uncorrected band of warp is also shorter than 1/2 of the roller pitch Lp, and the residual warp height remaining in the uncorrected band after leveling can be reduced.

Here, in the conventional roller leveler in which the rollers are arranged at equal pitches, a = Lp / 2. In this case, the height H of the residual warp after leveling is as large as about 22.3 mm as described above.

On the other hand, in the case of the present invention, for example, a =
If it is selected as 130 mm, the residual warp height is 6.
It can be reduced to 1/3 or less of the conventional value, such as 0 mm. When the residual warp height is reduced as described above, it becomes easier to pass the plate in the online heat treatment apparatus (the temperature adjusting device 6 and the cooling device 7) shown in FIG. 3, and the treatment effect can be made uniform.

As a comparative example, the leveler rollers 1 to 1 are shown in FIG.
4 is arranged in the order of the upper roller 2, the lower roller 1, the upper roller 4, and the lower roller 3 in the reverse order of the present invention. An example is shown in which (the left direction in the drawing) is moved. In this case, the warp correction of the tip of the plate material is performed by the rollers 2, 1 and 4,
Although it is re-bent in the opposite direction at the distance b between the rollers 1 and 4, it is understood that there is no effect of shortening the uncorrected band at the tip of the plate material because the distance b is large. On the other hand, the warp of the tail end of the plate is corrected by the rollers 1, 4 and 3 and is similarly bent in the opposite direction at the distance b between the rollers 1 and 4, but the uncorrected band at the tail end of the plate is still the distance. b, there is no effect of shortening the uncorrected band like the tip.

As another comparative example, in FIG. 10, leveler rollers 1 to 4 are arranged in the order of the upper roller 2, the lower roller 1, the upper roller 4, and the lower roller 3 in the reverse order of the present invention. Is moved from the equal pitch position with respect to the upper rollers 2 and 4 in the traveling direction of the plate material (rightward in the drawing). In this case, the warp of the tip of the plate material is corrected by the rollers 2, 1 and 4, and is bent again in the opposite direction at the distance a between the rollers 1 and 4, and the warp of the tail end of the plate material is corrected by the rollers 1 and 4. , 3 and is similarly bent in the opposite direction at the distance a between the rollers 1 and 4, the uncorrected strip of the plate material is separated by the distance a as in the present invention.
It can be shortened considerably. However, in this case, the distance between the rollers 2 and 3 located at both ends becomes long, and the size of the leveler roller becomes large, which is a practical problem.

As described above, according to this embodiment, the residual warp height after leveling the front and rear ends of the plate material can be reduced, and the heat treatment in the next process can be effectively performed.

Another embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an example in which the lower leveler rollers 1 and 3 are fixedly arranged, but in the present embodiment, the lower leveler rollers 1 and 3 are configured to be movable in the traveling direction of the plate material from the equal pitch position, and the distance a between the upper and lower rollers is made variable. Is.

In FIG. 11, in the roller leveler 9A of this embodiment, the lower rollers 1 and 3 are attached to a common bearing box 22. By attaching the worm jack 24 to the bearing box 22 and operating the worm jack 24, the lower rollers 1 and 3 can move in the traveling direction of the plate member 5 from the equal pitch position with respect to the upper rollers 2 and 4. Thus, the distance a in the plate material traveling direction between the lower roller 1 and the upper roller 2 and between the lower roller 3 and the upper roller 4 can be freely adjusted.

In this embodiment having such a structure, when the plate material 5 has a small thickness, the warp at the front and rear ends is large,
Accordingly, the distance a can be reduced, and when the plate material 5 has a large thickness, the warpage is also small. Therefore, the distance a can be increased accordingly. By allowing the distance a to be changed according to the size of the plate thickness in this way, the amount of residual warp can be always minimized and the leveling load can be reduced.

1 and 11, the leveler roller is an example of the minimum required four rollers. Actually, the number of upper rollers may be 5 and the number of upper and lower rollers may be 5 or 5 and the number of rollers may be larger. As shown in FIG. The effect of the present invention can be obtained by including at least two roller pairs in which the distance a between the upper and lower rollers in the plate material traveling direction is smaller than half the roller pitch Lp of the upper and lower roller groups themselves.

Although the leveler rollers in FIGS. 1 and 11 are two-stage type roller levelers having no reinforcing roller, the present invention may of course be applied to a four-level leveler having a reinforcing roller.

Furthermore, in FIG. 3, the distance a in the sheet material advancing direction of the upper roller and the lower roller is the same on both the inlet side and the outlet side, but this need not be the same. If these values are compared, for example, if the distance between the upper and lower rollers on the input side is a1 and the distance between the upper and lower rollers on the output side is a2, then a1 ≠ a2 may be satisfied, and these distances a1 and a2 should be smaller than Lp / 2. Thus, the effects of the present invention can be obtained.

Although the leveler rollers shown in FIGS. 1 and 11 are used in the on-line heat treatment apparatus for hot rolling, they may be used for straightening the front and rear edges of a plate material in cold rolling.

[0058]

【The invention's effect】

1. The distance in the plate material traveling direction between the first upper and lower rollers and the second
Since the distance between the upper and lower rollers in the plate material traveling direction is smaller than half the roller pitch, it is possible to reduce the height of the residual warp remaining in the uncorrected band of the defective warp at the front and rear ends of the plate material.

2. Since the lower roller group can be moved in the plate material traveling direction from the equal pitch position with respect to the upper roller group and the distance between the first upper and lower rollers and the distance between the second upper and lower rollers are made variable, the residual warp amount is always maintained. Minimize and leveling load can be reduced.

3. Since the roller leveler of the present invention is arranged in the on-line heat treatment device, the plate material in the temperature adjusting device and the cooling device can be passed smoothly, and the heat treatment effect is uniform.

[Brief description of drawings]

FIG. 1 is a diagram showing a roller leveler according to an embodiment of the present invention.

FIG. 2 is a diagram showing a roller arrangement of a roller leveler.

FIG. 3 is a diagram showing an on-line heat treatment apparatus incorporating the roller leveler of the present invention.

FIG. 4 is a diagram showing a warp state of front and rear edges of a hot-rolled sheet material.

FIG. 4 is an example of a roller arrangement of a roller leveler of the present application.

FIG. 5 is a diagram showing a roller arrangement for correcting a rear end warp of a plate material.

FIG. 6 is a view showing a roller arrangement for correcting a warp of a plate member.

7 is a bending / curvature diagram showing the relationship between the bending moment and the curvature for correcting the rear end warp of the plate material by the roller arrangement shown in FIG.

8 is a bending / curvature diagram showing the relationship between the bending moment and the curvature for correcting the warp of the plate material by the roller arrangement shown in FIG.

FIG. 9 is a diagram showing a comparative example in the case where leveler rollers are arranged in the order of an upper roller, a lower roller, an upper roller, and a lower roller, which is the reverse of the present invention.

FIG. 10 is another one in the case where the leveler rollers are arranged in the order of the upper roller, the lower roller, the upper roller, and the lower roller in the reverse order of the present invention.
It is a figure which shows two comparative examples.

FIG. 11 is a view showing a roller leveler according to another embodiment of the present invention.

[Explanation of symbols]

 1,3 Lower leveler roller 2,4 Upper leveler roller 5 Plate material 6 Temperature control device 7 Cooling device 8 Rolling machine 9 Roller leveler 10 Stand 15 Worm jack 17 Pinch roller

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[Procedure amendment]

[Submission date] July 16, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a diagram showing a roller leveler according to an embodiment of the present invention.

FIG. 2 is a diagram showing a roller arrangement of a roller leveler.

FIG. 3 is a diagram showing an on-line heat treatment apparatus incorporating the roller leveler of the present invention.

FIG. 4 is a diagram showing a warp state of front and rear edges of a hot-rolled sheet material.

FIG. 5 is a diagram showing a roller arrangement for correcting a rear end warp of a plate material.

FIG. 6 is a view showing a roller arrangement for correcting a warp of a plate member.

7 is a bending / curvature diagram showing the relationship between the bending moment and the curvature for correcting the rear end warp of the plate material by the roller arrangement shown in FIG.

8 is a bending / curvature diagram showing the relationship between the bending moment and the curvature for correcting the warp of the plate material by the roller arrangement shown in FIG.

FIG. 9 is a diagram showing a comparative example in the case where leveler rollers are arranged in the order of an upper roller, a lower roller, an upper roller, and a lower roller, which is the reverse of the present invention.

FIG. 10 is another one in the case where the leveler rollers are arranged in the order of the upper roller, the lower roller, the upper roller, and the lower roller in the reverse order of the present invention.
It is a figure which shows two comparative examples.

FIG. 11 is a view showing a roller leveler according to another embodiment of the present invention.

[Explanation of symbols] 1,3 Lower leveler roller 2,4 Upper leveler roller 5 Plate material 6 Temperature adjusting device 7 Cooling device 8 Rolling machine 9 Roller leveler 10 Stand 15 Worm jack 17 Pinch roller

Claims (3)

[Claims] 1. A first and second upper roller and a first and second upper roller.
The upper and lower rollers including the lower roller are arranged in a zigzag pattern,
In a roller leveler that repeatedly bends a plate material by these upper and lower rollers to correct the warp of the plate material, the plurality of upper and lower rollers are a first lower roller, a first upper roller, and a second lower roller in a traveling direction of the plate material. Second
The upper rollers are arranged in this order, and the distance between the first upper and lower rollers in the plate material advancing direction and the distance between the second upper and lower rollers in the plate material advancing direction are set to the first and second upper rollers and the first upper roller.
And a unequal pitch type roller leveler, which is smaller than half of the roller pitch of each of the second lower roller. 2. The unequal pitch type roller leveler according to claim 1, wherein a lower roller group including the first and second lower rollers is compared with an upper roller group including the first and second upper rollers. It is possible to move from the uniform pitch position in the plate material traveling direction,
An unequal pitch type roller leveler, wherein a distance between the first upper and lower rollers and a distance between the second upper and lower rollers are variable. 3. An online heat treatment apparatus for immediately supplying a high temperature plate material hot-rolled by a rolling mill to a temperature adjusting device to at least supplementally heat the plate material for uniform temperature distribution, at the inlet side of the temperature adjusting device, An on-line heat treatment apparatus comprising a two-stage roller leveler for arranging a warp of a tip end and a tail end of a hot-rolled plate material, and using the roller leveler according to claim 1 as the two-stage roller leveler.