JP2003117606A - Roller straightening method - Google Patents

Abstract

(57) [Problem] To provide a roller straightening method of a roller leveler for stably flattening a material to be warped or a wave shape. SOLUTION: In order to secure the biting property of the material to be corrected and to exert a sufficient correcting effect, the roll pushing amount and the biting limit value of the roll pushing amount necessary to exhibit a sufficient correcting effect. When the roll pushing amount required to exhibit a sufficient correction effect is larger than the biting limit value of the roll pushing amount, each roll pushing amount is larger than the biting limit value of the roll pushing amount. After the material to be corrected is bitten by reducing the size of the material to be corrected, the respective roll pushing devices are operated until the respective roll pushing amounts necessary for exhibiting a sufficient correction effect are obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention arranges a plurality of rolls in a zigzag pattern in the vertical direction and repeatedly bends the material to be bent between the rolls to flatten the warp of the material to be straightened or to corrugate it. The present invention relates to a roller straightening method using a roller leveler for straightening a shape.

[0002]

2. Description of the Related Art A roller leveler is used to flatten a warp generated in a rolling process or a cooling process of a plate material, a shape material, a pipe material, a wire material or the like, or to correct a wave shape. In the roller leveler, the pressing amount of a plurality of rolls arranged in a zigzag pattern on the upper and lower sides is set and controlled, and the material to be straightened is passed between the upper and lower rolls to perform the roller straightening. The straightening action of the roller leveler is to repeatedly bend the material to be straightened to flatten the material to be straightened, or to give a desired warp or corrugation. At this time, the driving force is transmitted to the material to be straightened by the drive roll of the roller leveler and / or the table roll, the feed roll, etc. installed on the entrance side of the roller leveler, and the material to be straightened bites into the roller leveler. Roller leveler pushing amount of each roll is
Demonstrate the corrective effect that is experimentally / empirically or theoretically required depending on the size, material constant, warpage, shape of the material to be straightened, roll diameter of the roll leveler, roll pitch, rigidity, flatness required for the material to be straightened, etc. It is set so that the amount of roll push-in required to obtain it can be obtained. Here, each roll pushing amount s _i is obtained by subtracting the distance between the apex of the roll and the straight line connecting the apices of the front and rear rolls of the roll from the thickness of the material to be straightened, and the apex of the roll, The case where the distance between the roll and the straight line connecting the vertices of the front and rear rolls is shorter than the thickness of the material to be straightened is defined as positive.

[0003]

However, even if the roll positions are set as described above and the material to be straightened is to be bitten into the roller leveler, the material to be straightened is bitten while the material to be straightened is biting into the roller leveler. There is a case where so-called jamming occurs, which is a slip between the roll and the roll. This is because when the roll pushing amount becomes excessive, the driving force of the material to be straightened becomes insufficient with respect to the resistance force against the biting of the material to be straightened when the roll is bitten. No technique has been found yet for effective countermeasures against such clogging.

According to the present invention, the material to be straightened is bitten in a state in which the roll pushing amount is smaller than the desired roll pushing amount, and thereafter, the roll pushing amount is increased to the desired roll pushing amount, so that the roll pushing amount is stabilized. An object of the present invention is to provide a roller straightening method capable of obtaining a sufficient straightening effect.

[0005]

The gist of the present invention is as follows. (1) A roller straightening method in which a plurality of rolls are arranged in a zigzag pattern vertically and a material to be straightened is repeatedly bent between the rolls to flatten the warp of the material to be straightened or to correct the wave shape. Before the biting of the material to be straightened, a desired roll pushing amount s _i required to exert a straightening effect is obtained, and then a biting limit value s ^lim of the roll pushing amount to the material to be straightened is obtained, For any roll, compare the desired roll push-in amount s _i with the roll-in push-in limit value s ^lim ,
When the relationship between the desired roll push-in amount s _i and the roll-in push-in limit value s ^lim satisfies the formula (1), the roll push-in amount at the time of letting the material to be straightened into the roll After opening at least one of the roll pushing devices so that the material to be straightened is bitten into the roll so that s _i ^B satisfies the expression (2), after the material to be straightened is bitten into the roll By pressing at least one of the roll pushing devices until the desired roll pushing amount s _i is reached, to flatten the warp of the material to be straightened or to correct the wave shape,
If the relationship between the desired roll push-in amount s _i and the roll-in push-in amount limit value s ^lim does not satisfy the equation (1), the straightened material is directly bitten to warp the straightened material. A roller straightening method characterized by flattening or straightening a wave shape. ^{_{s i> s lim ············ (1}} ) s i B ≦ s lim ··········· (2) (2) in passing material to be straightened material The roller straightening method according to (1), wherein the roll pushing amount is made variable by the pushing device. (3) The roller straightening method according to (1) or (2), characterized in that the pushing device is a hydraulic pushing device.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. First, based on the size, material constant, warp, shape of the material to be straightened, the roll diameter of the roller leveler, the roll pitch, the rigidity, the flatness required for the material to be straightened, etc. Find the quantity s _i .

Next, the biting limit value s ^lim of the roll pushing amount is obtained for the material to be straightened, and the desired roll pushing amount s _i is checked for each arbitrary roll. The biting limit value s ^lim of the roll pushing amount with respect to the material to be straightened is obtained by accumulating experimental data and operation data by using, for example, specifications and rigidity of the roller leveler, dimensions and material constants of the material to be straightened as parameters. You can ask. For each arbitrary roll, the formula (1) is not satisfied, that is, the bite limit value s ^lim of the roll push-in amount is the desired roll push-in amount s _i.
If it is determined that the material to be straightened is bitten into the roll, the material to be straightened may be bitten as it is, but the expression (1) is satisfied, that is, the amount of pushing of the roll is bitten. When the limit value s ^lim is smaller than the desired roll pushing amount s _i and it is determined that the material to be straightened does not bite, the formula (2) is satisfied, that is, the roll pushing amount is bitten. After opening at least one of the roll pushing devices so that the pushing limit value s ^lim is larger than the desired roll pushing amount s _i ^B ,
The material to be straightened is caught in the roll. After confirming that the material to be straightened has bitten, the desired roll pushing amount s _i
Depress at least one of the roll pushers until Here, if the reaction force associated with the correction is large,
It is preferable to use a hydraulic pushing device as each roll pushing device. s _i > s ^lim ······ (1) s _i ^B ≦ s ^lim ···· (2)

In this way, the material to be straightened can be bent sufficiently by ensuring the biting property of the material to be straightened into the roller leveler and then applying a desired roll indentation to the material to be straightened. Therefore, a sufficient correction effect can be obtained. It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

[0009]

[Example] [Example 1] Using this method, a plate thickness of 6.0 m
Roller straightening was performed using a normal steel plate having a width of m and a plate width of 3500 mm as a material to be straightened. FIG. 1 is a schematic side view of the roller leveler used in this example. This roller leveler has 5 upper rolls,
It is composed of a total of 11 rolls 1 to 11 of 6 lower rolls, the position of the lower roll group 12 is fixed, and each upper roll 2,
4, 6, 8 and 10 individually and independently push each upper roll 2, 4, 6, 8 and 10 by controlling the pushing amount of each roll pushing device 14 to 18 between the housing 21. It is possible. In addition, since the hydraulic pushing device is used as each of the roll pushing devices 14 to 18, it is possible to change the roll pushing amount even during the passage of the material to be straightened.

The roll push-in amount s _i desired for the roller straightening of the material to be straightened was determined as shown in Table 1.

[Table 1]

However, in this roller leveler, the
Boundary limit value s of roll push-in amount against straightening material
^limIs 5.8 mm, # 2 roll, # 3 roll, # 4
It is judged that the material to be straightened is not caught in the roll.
It was Actually, each roll pushing amount s_iChew the material to be straightened with
When I put it in, the material to be straightened on the # 3 roll
I slipped and didn't bite. Therefore, the tip of the material to be straightened
Pushing the i-th roll when the part bites into the i-th roll
Quantity s_i ^BIs the roll-in amount ^limTo
In order not to exceed, here, # 2 roll, # 3 roll,
The # 4 roll push-in amount is set to 5.8 mm and the straightening is performed.
Equipped with a # 4 roll pushing device that bites the material
By referring to the load from the load cell (not shown),
It was confirmed that the tip of the material to be straightened was caught in the # 4 roll.
After that, # 2 roll pushing amount s₂8.4mm, # 3 roll
Push amount s₃Is 7.3 mm, # 4 roll pushing amount s_Four
# 2 roll pushing device 14 and
And # 4 roll pushing device 15 is operated and pushed in.
It is. At this time, the # 6 to # 10 roll pushing device 16
~ 18 did not work. As a result, the bite of the material to be straightened
No blind spots are generated, and the material to be straightened is stably passed to the rear edge.
I was able to make wood.

In the present embodiment, the biting of the material to be straightened into each roll is determined by the load cell load provided in each roll. For example, a plate detection sensor installed on the outlet side of each roll It is also possible to adopt a method of making a judgment based on
The present method is not limited to the method of determining the roll bite of the material to be straightened.

[Embodiment 2] This embodiment is a method suitable for setting / controlling the amount of pushing of each roll of a roller leveler by means of a roll pushing device installed on the entrance / exit side thereof. FIG. 2 is a schematic side view of the roller leveler used in this example. This roller leveler is composed of a total of 11 rolls 1 to 11 including 5 upper rolls and 6 lower rolls, the position of the lower roll group 12 is fixed, and the upper roll group 13 is pushed into the entrance side between the upper roll group 13 and the housing 21. By controlling the pushing amounts of the device 19 and the pushing-out device 20, the tilting pushing is possible. Since the hydraulic pushing device is used here as the entrance side pushing device 19 and the exit side pushing device 20, it is possible to change the roll pushing amount even during the passage of the material to be straightened. .

Using this method, a plate thickness of 7.0 mm and a plate width of 32
Roller straightening was performed using a 00 mm ordinary steel plate as a material to be straightened. The inward / outward roll pressing amounts s _in and s _out required to straighten the material to be straightened are s _in of 8.2 mm and s.
_Out was determined to be 0.6 mm. However, in the present roller leveler, the biting limit value s ^lim of the roll pressing amount with respect to the material to be straightened was 6.0 mm, and it was determined that the material to be straightened did not bite in each roll on the entry side of the # 4 roll. . Actually, the inward roll pushing amount s _in is 8.2 m
The material to be straightened was slipped on the # 3 roll when the material to be straightened was squeezed in with the m and the pushing amount s _out of the delivery side roll set to 0.6 mm. Therefore,
In order to prevent the i-th roll pushing amount s _i ^B when the tip of the material to be straightened bites into the i-th roll from exceeding the biting limit value s ^lim of the roll pushing amount, here, first, the entering-side roll pushing amount s After setting _in to 6.0 mm and pushing out side roll pushing amount s _out to 0.6 mm, the material to be straightened is bitten, and after confirming that the tip of the material to be straightened is bitten into the # 3 roll, the pushing amount s of the incoming side roll is s _The inward-side pushing device 19 is operated and pushed in until the _in becomes 7.8 mm, and after confirming that the tip of the material to be straightened has bitten into the # 4 roll, the inward-side roll pushing amount s _in is 8.2 mm. The inlet side pushing device 19 was operated and pushed in until it became. At this time, the delivery side pushing device 20 is not operated, and the delivery side roll pushing amount s _out
Was fixed at 0.6 mm. The bite of the material to be straightened did not occur, and it was possible to pass the material to the rear end of the material to be straightened stably.

[Embodiment 3] Using this method, a plate thickness of 5.0
As a material to be corrected, a normal steel plate having a width of ˜20.0 mm and a plate width of 1800 to 4200 mm was used for correction using a roller leveler whose side conceptual view is shown in FIG. As a comparative example, when each roll pushing amount is fixed to a value necessary for straightening each straightened material, and when it is fixed to a value that does not exceed the bite limit value of the roll pushing amount for each straightened material But I operated. FIG. 3 shows the non-bite ratio of the material to be straightened (the number of the material to be straightened against the total number of straightened materials). It can be seen that when the pushing amount of each roll is fixed to a value necessary for straightening the material to be straightened, the clogging rate is high and stable striping is difficult. Also, FIG.
Shows the straightening pass rate (the number of flatnesses with respect to the total number of straightenings satisfying the acceptance standard) of the material to be straightened. It can be seen that the straightening pass rate is low when the roll push-in amount for each material to be straightened is fixed to a value that does not exceed the bite limit value. That is, it can be seen that this method can provide a stable correction effect.

[0016]

As described above, according to the present invention, the material to be straightened is bitten in a state where the roll push-in amount of the roller leveler is smaller than the desired roll push-in amount, and then the roll push-in is performed up to the desired roll push-in amount. By increasing the amount, the biting property of the tip of the material to be straightened and a sufficient straightening effect can be stably obtained. As a result, the re-correction rate is lowered, so that time loss and energy loss can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a roller leveler used in Examples 1 and 3 of the present invention.

FIG. 2 is a side view showing the outline of a roller leveler used in Example 2 of the present invention.

FIG. 3 is a graph showing the non-clogging rate of the material to be straightened in Example 3 of the present invention and Comparative Example.

FIG. 4 is a diagram showing a straightening pass rate of a material to be straightened in Example 3 of the present invention and a comparative example.

[Explanation of symbols]

1 # 1 roll (lower roll) 2 # 2 roll (upper roll) 3 # 3 roll (lower roll) 4 # 4 roll (upper roll) 5 # 5 roll (lower roll) 6 # 6 roll (upper roll) 7 # 7 roll (lower roll) 8 # 8 roll (upper roll) 9 # 9 roll (lower roll) 10 # 10 roll (upper roll) 11 # 11 roll (lower roll) 12 Upper roll group 13 Lower roll group 14 # 2 Roll pushing device 15 # 4 Roll pushing device 16 # 6 Roll pushing device 17 # 8 Roll pushing device 18 # 10 Roll pushing device 19 Entry-side roll pushing device 20 Roll-out device on delivery side 21 housing

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeru Ogawa             20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel shares             Company Technology Development Division F-term (reference) 4E003 AA02 BA14 BA23 EA02                 4E026 EA02 EA12

Claims (3)

[Claims] 1. A plurality of rolls are arranged in a zigzag pattern vertically.
And then repeatedly bend the material between the rolls.
To flatten the warpage of the material to be straightened
Is a roller straightening method for straightening the wave shape, Before the material to be straightened bites, it is necessary to exert the straightening effect.
Required and desired roll pushing amount s_iAnd then
Boundary limit value s of roll pushing amount to the material to be straightened
^limAnd for any roll, the desired roll
Push amount s _iLimit value of roll and roll pushing amount
s^limAnd the desired roll pushing amount s_iAnd b
Limit value s of roll pushing amount^limRelationship with
When (1) is satisfied, the material to be straightened is bitten by the roll.
Pushing amount s of the roll when it is inserted _i ^BSatisfies expression (2)
At least one of each roll pushing device to add
To release the material to be straightened into the roll,
Push the desired roll after the material to be straightened is bitten into the roll
Amount s_iAt least of each roll pushing device until
Push one to flatten the warpage of the material to be straightened, or
The shape is corrected and the desired roll pushing amount s_iWhen
Boundary limit value s of roll pushing amount^limRelationship with
When the condition (1) is not satisfied, the material to be straightened is bitten as it is.
Flatten the warpage of the material to be straightened or make it wavy
A roller straightening method characterized by straightening. s_i> S^lim・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (1) s_i ^B≤ s^lim・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ (2) 2. The roller straightening method according to claim 1, wherein a roll pushing amount is made variable by a pushing device during passage of the material to be straightened. 3. The roller straightening method according to claim 1, wherein the pushing device is a hydraulic pushing device.