JPH08267140A - Method for straightening metallic long size material with roller leveler and device therefor - Google Patents

Abstract

PURPOSE: To set the rolling reduction to decrease the residual curvature after straightening of a metallic long size material. CONSTITUTION: A minimum residual curvature κres.min is obtained from a quadratic expression with the yield curvature κyl of a metallic long size material and the initial curvature κni of the metallic long size material, if the minimum residual curvature κres.min is equal to or smaller than a target residual curvature κres.tar, the most suitable maximum curvature κmax.opt as the maximum curvature to act the metallic long size material in the time of passing through a roller leveler in order to make the residual curvature into the minimum is obtained by calculating from a linear expression of making the initial curvature κini as a variable. Therefore, in the roller leveler that the rolling reduction Di is changed being distributed in an alrnost straight line-like, the inlet side rolling reduction Din is obtained easily by calculating. Further, the distribution of the rolling reduction of the roller leveler is made into a protruding curve-like, and the residual curvature can be decreased more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for straightening a long metal strip, for example, a metal strip such as a steel plate, and a profile such as a profile steel by a roller leveler.
Furthermore, it relates to the construction of the roller leveler.

[0002]

2. Description of the Related Art In a roller leveler, for example, as shown in FIG. 26, a rolled material 2 having a shape defect such as a selvage 1 indicated by diagonal lines due to a difference in cooling water amount during quenching is shown in FIG. By passing through a roller leveler having a lower roller 3 and an upper roller 4, the sheet is straightened by repeated bending as indicated by reference numeral 5 in FIG. The above-mentioned rolled material 2 has various curvatures in each part, and is repeatedly bent as shown by the reference symbols (1) to (3) in FIG. 29. After that, the correction curvature is gradually reduced, the residual curvature is converged to zero, and the plate is corrected to have no warp or wave.

Such a roller leveler is a device for correcting warping and bending of a steel sheet after rolling, for example, by repeated bending, and the correction effect is determined by the amount of reduction. Therefore, depending on how this reduction amount is set,
The correction effect changes. The correction effect is the residual curvature and deformation after correction by the roller leveler. Conventionally, there is no theoretically clarified method for setting the reduction amount, and the reality is that it depends on the intuition and experience of the operator who is the operator in each steel factory.

In Japanese Patent Laid-Open No. 61-262427, the curvature of the plate being straightened is estimated based on the reaction force acting on the roller during straightening, and the reduction amount is adjusted so as to obtain the target curvature initially set. That is. It is only shown that the method of setting the target reduction amount is a function of yield curvature and plate thickness.

Another prior art is Japanese Patent Laid-Open No. 6-10624.
In the first method, the curvature of the plate being straightened is measured using a distance setter which is a laser displacement meter, and the amount of reduction is adjusted so that the target curvature initially set is measured. There is no disclosure about how to set the target amount of reduction, and differences in materials and effects of initial curvature are not considered.

Therefore, in each of the prior arts, no attempt has been made to determine the optimum rolling reduction condition.

The prior art relating to the distribution shape of the reduction amount in the roller leveler is, for example, JP-A-62-33015. In this prior art roller leveler, the upper roller and the lower roller are each mounted on an integral frame.
Therefore, the amount of reduction, that is to say simply, the distance between the surfaces of the upper roller and the lower roller changes linearly from the entrance side to the exit side. Therefore, there are only two adjustment amounts for optimally correcting the plate, namely, the amount of reduction on the inlet side and the amount on the outlet side,
The corrective effect cannot be fully optimized.

[0008] In order to achieve the desired amount of reduction even when the frame is bent by the reaction force of the thin metal plate and the strip to be straightened, it is another prior art feature. In Japanese Patent Publication No. 56-41323, the bending is adjusted so that the straightening roller array becomes an arc shape. In such a prior art as well, it is premised that the distribution of the reduction amount is linearly changed, and the optimization of the correction effect is not considered sufficiently.

In summary, in these prior arts, the reaction force, the torque, or the curvature of the long metal strip acting on the roller being straightened is actually measured, and the long metal strip being straightened is based on the measurement result. The target curvature is compared with the target maximum curvature, and if it is insufficient, the amount of reduction is increased, and if it is excessive, the amount of reduction is reduced. There is no prior art on how to do this.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for straightening a long metal strip by a roller leveler, and a roller leveler for straightening the long strip so that the long strip can be straightened. Is to provide.

It is another object of the present invention to provide a straightening method and apparatus for a metal long material by a roller leveler capable of appropriately determining the distribution of the amount of reduction in the roller leveler and fully optimizing the straightening effect, and a roller leveler. Is to provide.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to a minimum residual curvature κres · min after straightening a long metal material by a roller leveler.
Is defined as a constant by the specification of the roller leveler and the yield curvature κyl of the long metal material to be corrected by the roller leveler, and is expressed by a quadratic equation in which the initial curvature κini of the long metal material is a variable, and is corrected. Initial curvature κ of long metal material
Find ini and substitute it into the quadratic equation above to obtain the minimum residual curvature κres
min, and the minimum residual curvature κres
Is a correction method using a roller leveler for a long metal material, which is characterized by comparing whether or not is less than or equal to the target residual curvature κres · tar. The present invention also provides a minimum residual curvature κre obtained by the above calculation.
When s · min exceeds the target residual curvature κres · tar, the minimum residual curvature κres · min obtained by the previous calculation is substituted into the quadratic equation as the initial curvature κini to obtain the minimum residual curvature κres · min of this time. To obtain the target residual curvature κre
s · tar, and this operation comparison operation is performed with the minimum residual curvature κ.
The method is characterized in that the number of passes to be corrected by the roller leveler is obtained by repeating the process until res · min becomes equal to or less than the target residual curvature κres · tar. The present invention also provides an optimum maximum curvature κma that is the maximum curvature that occurs in a long metal strip during straightening with a roller leveler for minimizing the residual curvature after straightening with a roller leveler.
x · opt is expressed by a linear expression in which a constant is determined by the specifications of the roller leveler and the yield curvature κyl of the long metal strip to be corrected by the roller leveler, and the initial curvature κini of the long metal strip is a variable, The initial curvature κini of the long metal material to be corrected is calculated, and the optimum maximum curvature κmax · opt is calculated by substituting it into the above-mentioned linear expression. so,
A straightening method using a roller leveler for a long metal material, which comprises straightening with a roller leveler. Further, the present invention uses a roller leveler in which a plurality of upper and lower rollers are alternately arranged with an equal pitch L from the inlet side to the outlet side, and the roll amount has a roll amount distribution in which the roll amount Di changes substantially linearly. When the maximum curvature κmax to be applied to the metal long material having κyl is given, the inlet side reduction amount Din
Is calculated from the following equation: κmax = a · (Din / L ² ) + b where a and b are values depending on the yield curvature κyl, and the roller leveler is adjusted so that the inlet side reduction amount Din thus obtained is obtained. It is a method of straightening a metal long material by a roller leveler, which comprises setting and straightening a metal long material. Further, the present invention is characterized in that the value a is expressed by a linear expression having a yield curvature κyl as a variable, and the value b is expressed by a quadratic expression having a yield curvature κyl as a variable. Further, the present invention uses a roller leveler having a plurality of rollers arranged vertically from the inlet side to the outlet side, and reduces the amount of reduction of the metal long material from the inlet side to the outlet side, and at the inlet side and the outlet side. And a distribution shape that is convex downwardly between the two, and is a straightening method using a roller leveler for a long metal material. Further, according to the present invention, the distribution shape of the reduction amount can be calculated by changing the pitch L in which upper and lower rollers are alternately arranged, the entrance side reduction amount Din, the exit side reduction amount Dout, the reduction amount Di of the i-th roller from the insertion side, Total distance between rollers from the side to the i-th roller ΣLi,
When the inter-roller distance Ltotal from the inlet side to the outlet side, Di = Din - (Din- Dout) · expressed in (ΣLi / Ltotal) ^n, claims n is characterized chosen that less than 1/4 It is a method of straightening a metal long material described in No. 6 by a roller leveler. Further, the present invention is characterized in that n = 1/4. Further, the present invention uses a roller leveler in which a plurality of rollers are alternately arranged vertically from the entrance side to the exit side, and the reduction amount Di changes little as it goes from the entrance side to the exit side. After minimum residual curvature κresmin
Is defined as a constant by the specification of the roller leveler and the yield curvature κyl of the long metal material to be corrected by the roller leveler, and is expressed by a quadratic equation in which the initial curvature κini of the long metal material is a variable, and is corrected. The initial curvature κ ini of the long metal to be obtained is calculated and substituted into the above quadratic equation to obtain the minimum residual curvature κ r
es ・ min is calculated, and the optimum maximum curvature κmax ・ opt, which is the maximum curvature that occurs in a long metal strip during straightening with a roller leveler, to minimize the residual curvature κres after straightening with a roller leveler Specifications and yield curvature κ of long metal strip to be corrected by its roller leveler
The constant is determined by yl and the initial curvature κ of the long metal material.
Expressed by a linear equation with ini as a variable, and when the minimum residual curvature κres · min obtained from the quadratic equation is less than or equal to the target residual curvature, the initial curvature κini of the long metal material is substituted into the linear equation. Then, the optimum maximum curvature κmax · opt is obtained by using the obtained optimum maximum curvature κmax · opt, and the inlet side reduction amount Din is obtained from the following equation: κmax · opt = a · (Din / L ² ) + b Here, a and b are values that depend on the yield curvature κyl, and are set by the roller leveler so as to obtain the inlet side reduction amount Din thus obtained. It is a correction method. Further, in the present invention, the roller leveler is a roller leveler in which a plurality of rollers are arranged vertically from the entrance side to the exit side with an equal pitch L alternately, and a reduction amount distribution in which the reduction amount Di changes substantially linearly is used. It is characterized by Further, the present invention is characterized in that the amount of reduction of the long metal material is set in a downwardly convex distribution shape between the inlet side and the outlet side. Further, according to the present invention, the distribution shape of the reduction amount can be calculated by changing the pitch L in which upper and lower rollers are alternately arranged, the entrance side reduction amount Din, the exit side reduction amount Dout, the reduction amount Di of the i-th roller from the insertion side, Total distance between rollers from the side to the i-th roller ΣLi,
Di = Din− (Din−Dout) · (ΣLi / Ltotal) ⁿ where n is the distance between the rollers from the entrance side to the exit side, and n is selected to be ¼ or less. Further, the present invention is characterized in that n = 1/4. Further, according to the present invention, a plurality of rollers are alternately arranged vertically from the entrance side to the exit side, and the roll leveler in which the reduction amount Di gradually changes from the entrance side to the exit side and the initial curvature κini of the metal long material are set. In response to the output from the signal generating means for generating the signal, the signal generating means, the constant is determined by the specifications of the roller leveler and the yield curvature κyl of the long metal material,
And the first computing means for computing the minimum residual curvature κres · min after correction by the roller leveler by substituting the initial curvature κini input from the signal generating means into a quadratic equation having the initial curvature κini as a variable. In response to the output from the calculation means, the minimum residual curvature κres
A judgment means for judging by comparing that it is below s ・ tar,
In response to the output from the signal generating means, the constant is determined by the specifications of the roller leveler and the yield curvature κyl of the long metal material,
Further, by substituting the initial curvature κini input from the signal generating means into a linear expression having the initial curvature κini as a variable, the optimum maximum curvature κmax which is the maximum curvature of the roller leveler for minimizing the residual curvature κres after correction. The minimum residual curvature κres · min obtained by the first calculating means in response to the outputs of the second calculating means for calculating opt, the first calculating means, the judging means and the second calculating means is less than or equal to the target residual curvature κres · tar. , The optimum maximum curvature κmax · o obtained by the second computing means.
A straightening device using a roller leveler made of a long metal material, including a control means for driving and controlling the roller leveler so that pt can be achieved. Further, in the present invention, in the roller leveler, upper and lower rollers are arranged with an equal pitch L, and the control means further comprises:
In response to the output of the second calculating means, the inlet side reduction amount Din is calculated by the following equation, and κmax · opt = a · (Din / L ² ) + b where the value a is the yield curvature κyl. The value b is expressed by a linear expression that includes a third calculating means expressed by a quadratic expression having a yield curvature κyl as a variable, and the inlet-side reduction amount Din of the roller leveler obtained by the third calculating means. It is characterized by achieving. According to the present invention, in the roller leveler, the distribution shape of the reduction amount is such that the upper and lower rollers are alternately arranged, the pitch L, the input side reduction amount Din, the output side reduction amount Dout, and the reduction of the i-th roller from the input side. Letting Di be the sum of the inter-roller distances from the entry side to the i-th roller ΣLi and the inter-roller distance Ltotal from the entry side to the exit side, Di = Din − (Din−Dout) · (ΣLi / Ltotal) expressed as ^n, n is equal to or is selected to 1/4 or less. Further, the present invention provides a lower roller row in which a plurality of lower rollers are arranged at intervals from the entrance side to the exit side, and a plurality of upper rollers at intervals from the entrance side to the exit side, and between the lower rollers. An upper roller row that is arranged, a first actuator that is provided on the entrance side and that changes and sets the vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row that are provided on the exit side. A second actuator for changing and setting an upper and lower interval between and, and at least one of a lower roller row and an upper roller row are individually supported, and displacement driving is performed in an upper and lower displacement direction perpendicular to the transport direction. And a drive adjusting means for adjusting and setting the roller leveler. Further, the present invention provides a lower roller row in which a plurality of lower rollers are arranged at intervals from the entrance side to the exit side, and a plurality of upper rollers at intervals from the entrance side to the exit side, and between the lower rollers. An upper roller row that is arranged, a first actuator that is provided on the entrance side and that changes and sets the vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row that are provided on the exit side. And a second actuator that sets up and down intervals of the upper roller and the lower roller row or at least one roller of the upper roller row are individually supported, and can be displaced in a horizontal direction perpendicular to the transport direction. A roller leveler comprising: a wedge piece; and a driving means for displacing and setting the wedge piece in the direction. Further, the invention is characterized in that at least one of the lower roller row and the upper roller row is supported by a pair of backup rollers that support each roller, and the backup roller is displaceable by a wedge piece. Further, the present invention provides a lower roller row in which a plurality of lower rollers are arranged at intervals from the entrance side to the exit side, and a plurality of upper rollers at intervals from the entrance side to the exit side, and between the lower rollers. An upper roller row that is arranged, a first actuator that is provided on the entrance side and that changes and sets the vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row that are provided on the exit side. A second actuator for changing and setting a vertical gap between the upper and lower rollers, a backup roller that individually supports each roller of at least one of the lower roller row and the upper roller row, and a backup roller individually. In favor of
It is a roller leveler characterized by including drive adjustment means for displacement-driving in an up-down displacement direction perpendicular to the transport direction. Further, the present invention provides a lower roller row in which a plurality of lower rollers are arranged at intervals from the entrance side to the exit side, and a plurality of upper rollers at intervals from the entrance side to the exit side, and between the lower rollers. An upper roller row that is arranged, a first actuator that is provided on the entrance side and that changes and sets the vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row that are provided on the exit side. A second actuator for changing and setting the vertical gap between the backup roller and the backup roller, and a backup roller forming a pair for individually supporting at least one of the lower roller row and the upper roller row, and the backup roller. A roller leveler, comprising: a support shaft that is supported so as to be angularly displaceable around an axis that is eccentric from the axis of the roller; and drive means that drives the support shaft by performing angular displacement around the axis.

[0013]

The present inventor has developed a numerical analysis method for the curvature of the plate during straightening and the residual curvature after straightening, and has carried out an enormous amount of numerical analysis by this analysis method. As a result, there is an optimum value of the maximum curvature during correction to minimize the residual curvature range (that is, the optimum maximum curvature), and even if the maximum curvature is increased more than necessary, the residual curvature may increase conversely. understood. In addition, the material properties (thickness, yield stress, Young's modulus 3
The optimum maximum curvature was determined by the yield curvature and the initial curvature of the plate. Furthermore, if the relationship between the amount of reduction and the maximum curvature during straightening is also clarified, and if the yield curvature and initial curvature that are the material properties of the plate to be straightened are determined, then the optimum amount of reduction can be calculated. As a result, a reasonable reduction amount can be set without trial and error in an actual machine, and the number of times of re-correction, that is, the number of passes can be reduced because the residual curvature is large.

According to the present invention, when performing the correction by the roller leveler, the initial curvature κini of the long metal material is substituted into a quadratic equation for obtaining the minimum residual curvature κres · min, and the minimum residual curvature thus obtained is obtained. By comparing and judging whether κres ・ min is less than the target residual curvature κres ・ tar, the correction is completed by passing the roller leveler only once and performing one so-called one pass, or the roller leveler is made two or more passes. It is possible to decide whether to perform the above.

When the long metal material is passed through the roller leveler a plurality of times, the minimum residual curvature κres · min calculated in the previous pass is calculated as the initial curvature κini of the current pass for each pass.
It can be calculated by using the above-described quadratic equation. Minimum residual curvature κres calculated by each calculation
• Substituting min into the quadratic equation and repeating the calculation to obtain the number of corrections to be passed through the roller leveler until the target residual curvature κres · tar or less, that is, the number of passes.

Further, according to the present invention, the initial curvature κini of the long metal material can be calculated by the method 1 for obtaining the optimum maximum curvature κmax · opt.
Substituting into the following equation, the optimum maximum curvature κmax
Set the pattern of the rolling amount of the roller leveler to be pt, for example, the rolling amount distribution of the roller leveler and the inlet side rolling amount,
Make a correction.

According to the present invention, the roller leveler is such that a plurality of rollers are alternately arranged at the upper and lower sides at the equal pitch L, and the rolling reduction amount D is obtained.
When i is configured to decrease from the inlet side to the outlet side in a substantially linear manner, when the inlet side reduction amount Dini is known, the maximum curvature κmax, the pitch L, and the yield curvature κyl of the long metal material are known,
Correction is performed by setting the roller leveler so as to obtain the inlet side reduction amount Dini obtained from the arithmetic expression. The values a and b in the equation for obtaining the entry side reduction amount Dini are respectively expressed by a linear equation and a quadratic equation with the yield curvature as a variable, and the entry side reduction amount Dini for successful correction is highly accurate. Can be calculated and calculated.

The inventor of the present invention used the above-mentioned analysis method to find the residual curvature when the amount of reduction was changed into a convex curve upward and a convex curve downward. As a result, it was found that the residual curvature was smaller in the case of the downward convex curve-shaped distribution of distribution than in the linear distribution of distribution. Further, when a power function is used as a curve representing the distribution of the reduction amount, it was clarified by analysis that the power value n should be about 1/4. Therefore, by setting the distribution of the reduction amount as described above, the residual curvature can be made smaller than that in the conventional linear reduction amount setting.

According to the present invention, the amount of reduction of the long metal strip by the roller leveler is changed so as to decrease from the inlet side to the outlet side, and the distribution shape is convex downward between the inlet side and the outlet side. The residual curvature can be made sufficiently small.

According to the present invention, the distribution shape of the reduction amount is determined such that the reduction amount Di of the i-th roller from the inlet side is the sum ΣLi of the inter-roller distances from the inlet side to the i-th roller and the inlet side. When the ratio between the distance from the roller to the exit side and the total distance Ltotal is set to the n-th power, n is selected to be ¼ or less, so that the residual curvature range can be set to a substantially constant small value.

Furthermore, according to the present invention, each roller of at least one of the lower roller row and the upper roller row, or both rollers is individually supported by a wedge piece, and the wedge piece is driven by a driving means, for example, a double-acting hydraulic pressure. Displacement driving is performed by a cylinder or a screw driving structure, etc., so that the rolling reduction can be individually set for each roller.

According to the present invention, each roller is supported by the backup roller, and the backup roller can be displaced and driven by the wedge piece to correct and set the reduction amount Di of each roller.

Further, according to the present invention, the backup roller may be realized by driving the eccentric support shaft for angular displacement.

Thus, according to the present invention, the first and second
By driving the actuator, it is possible to change and set the total amount of reduction of the lower roller and the upper roller at a high speed, and thus it is possible to quickly respond to the change of the long metal material to be corrected. In addition, before the straightening, it is possible to quickly perform an operation such as raising the upper roller row to reduce the amount of reduction to facilitate passage of the long metal material to be straightened. Further, by using a wedge piece or an eccentric support shaft to make the distribution of the amount of reduction, for example, a downward convex curve, reduce the residual curvature compared to the linear distribution of the amount of reduction, and improve the correction effect. You can

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a roller leveler 1 according to an embodiment of the present invention.
It is a side view of 1. A long metal material 12 such as a steel plate, a coil, or a shaped steel is guided from an entrance side 13 of a roller leveler 11, its shape is corrected, and it is taken out from an exit side 14 to perform a one-pass correction operation. Lower rollers R1, R3, R5, R7,
The row 15 of R9 and R11 is supported by the lower frame 16. Row 1 of upper rollers R2, R4, R6, R8, R10
7 is an individual rolling-down adjusting means B2, B4, B6, B8, B1.
The amount of reduction can be adjusted individually by 0, and the frame 18
Supported by. The axes of the rollers R1 to R11 are horizontal and perpendicular to the transport direction 19 of the long metal material 12.

The first actuator 20 is provided on the entrance side 13 of the roller leveler 11 and can be set by changing the distance between the lower frame 16 and the upper frame 18. Further, the output side 14 is provided with a second actuator 21, by which the distance between the lower frame 16 and the upper frame 18 can be changed and set. Each of these actuators 20 and 21 can be realized by, for example, a double-acting hydraulic cylinder. Alternatively, a nut member is screwed onto a screw rod that is driven to rotate by a motor, and the nut is configured to be displaced along the axis of the screw rod. The screw rod is connected to, for example, the lower frame 16, and the nut is connected to the upper frame. It may be realized by a structure connected to 18, or may be another structure capable of expanding and contracting.

FIG. 2 is a simplified sectional view taken along the section line II-II of FIG. The individual rolling-down adjusting means B2 for the upper roller R2 includes a support member 23 that rotatably supports a plurality of backup rollers 22 arranged in the axial direction of the roller R2, and a wedge piece 24 that slidably contacts the support member 23. A driving means 26 such as a double-acting hydraulic cylinder for displacing and setting the wedge piece 24 in a horizontal direction in a displacement direction 25 perpendicular to the conveying direction 19 of the long metal material 12. The roller R2 is supported by the housing 27 via the support member 23 and the wedge piece 24. Wedge piece 24
Are held by receiving beams 28 fixed to the housing 27. Remaining individual reduction adjusting means B4, B6, B
8 and B10 also have the same structure.

By using the roller leveler 11 shown in FIGS. 1 and 2 as described above, the first and second actuators 20 and 21 can be driven to change the total amount of reduction at a high speed. Each roller R2, R
It is possible to easily and accurately change the reduction amount for each of R4, R6, R8, and R10, and to make the distribution of the reduction amount linear, and as described later, It is also easily possible to distribute it in a curvilinear form to reduce the residual curvature and improve the correction effect.

FIG. 3 is a diagram for explaining the distribution of the reduction amount of the roller leveler 11. Lower rollers R1, R3, R
The axes of 5, R7, R9, and R11 are on a horizontal imaginary plane 29, and the axes of the upper rollers R2, R4, R6, R8, and R10 are on another imaginary plane 30. As indicated by reference numeral 31 in 2), the reduction amount may be linearly distributed so as to decrease from the inlet side 13 to the outlet side 14. In another embodiment described later, the roller R4 may be displaced by the individual reduction adjusting means B4 in a plane shape whose center is perpendicular to the virtual plane 30 as indicated by the position R4a. Can also be set in a downwardly convex curved shape, changing in a curved shape as indicated by reference numeral 32.

In the present specification, the amount of reduction described above and below will be described with reference to FIG. Lower rollers R1, R
In the state in which the upper roller R2 is arranged with an equal pitch L between the front and the rear, the rollers R1,
R3; a straight line 3 perpendicular to the virtual plane 29 passing through each axis of R2
The value indicated by the distance D between the center positions 36 and 37 in the thickness direction of the elongated metal material 12 to be corrected on 3, 3 is the reduction amount.

With reference to FIG. 5, the curvature that occurs when the metal strip 12 passes through the roller leveler 11 will be described. Figure 5
As shown in (1), when the metal strip 12 is passed between the upper and lower rollers R1 to R11, the initial curvature thereof is indicated by the reference symbol κini, and the metal strip 12 after one pass is completed.
The residual curvature of is denoted by the reference sign κres. The maximum value of the absolute value of the curvature acting on the long metal material 12 is the maximum curvature κma.
indicated by x.

The absolute value of the curvature acting on the long material 12 for each of the rollers R1 to R11 is as shown in FIG.
According to the present invention, the residual curvature κres can be made sufficiently small.

The curvature of the long member 12 is defined with reference to FIG. It represents the degree of bending of the center line 38 of the long material 12 in the thickness direction, and changes every moment at each position.

The roller pitch L is generally set as small as possible, and in this embodiment, for example, the roller radius is +1.
It may be 0 mm. As for the shape of the long metal material 12 before straightening, only the bending in the longitudinal direction having a constant curvature κ is considered. In this embodiment, all the rollers R1 to R11 have the same size and shape. Further, in another embodiment described below with reference to FIGS. 8 to 17, it is assumed that each rolling-down amount Di by each of the rollers R1 to R11 changes in a curved shape from the inlet side 13 to the outlet side 14. Here, i is the i-th roller Ri from the entrance side 13.
And i is 1 to 11. Table 1 shows the specifications of the rollers R1 to R11 and the material properties of the metal elongated member 12 which is a steel plate used in the experiments or numerical analysis of the present inventor. In the following description, numerical analysis may be called experiment.

[0035]

[Table 1]

In order to discuss the actual correction capability of the roller leveler 11, it becomes a problem how much the residual curvature on the outgoing side 14 becomes. Therefore, the long material 12 on the entrance side 13
The range of the residual curvature of the outgoing side 14 when the initial curvature κini of is changed within a fixed range is obtained as follows. Delivery side 1
Regarding the setting of the reduction amount of 4, when the initial curvature κ ini is zero, the value that makes the residual curvature zero, that is, the appropriate exit side reduction amount is used. In the following experimental results, the curvature κ is
The yield curvature κyl (= 2 × yield stress / Young's modulus / plate thickness) of the long material 12 is shown as dimensionless.

FIG. 8 is a graph showing the relationship between the maximum curvature κmax and the residual curvature range Δκres according to the experiment by the present inventors. The residual curvature range Δκres refers to the difference between the maximum value and the minimum value of the residual curvature κres when the initial curvature κini is changed. In this experiment, the initial curvature is -0.5 of the yield curvature κyl.
Double to +0.5, -1.0 to = 1.0, ...,-
Change from 5 times to +5 times.

From this FIG. 8, there exists the optimum value of the maximum curvature κmax during correction for minimizing the residual curvature range Δκres, that is, the optimum maximum curvature κmax · opt, and even if the maximum curvature κmax is increased more than necessary. It was found for the first time by the present inventors that the residual curvature κres increases conversely.

Referring to FIG. 9, when the initial curvature κ ini is changed, the residual curvature κ res changes in a curve convex upward,
A line 39 represents a curve when the amount of reduction on the outlet side is larger than that of the line 40. The residual curvature range Δκres is
Residual curvature κres in the change range of positive and negative initial curvature κini
Shows the range of change of. In the present invention, an optimum maximum curvature κmax · opt described later is calculated so that the residual curvature range Δκres is as small as possible, and the entrance side 13
Determine the amount of reduction. In the above embodiment, the initial curvature κin
If the residual curvature κres is zero when i is zero, the output side 14
However, as another embodiment, the reduction amount of the outlet side 14 may be set to a predetermined constant value.
Alternatively, the reduction amount on the outlet side 14 may be set so that the average value of the residual curvature range Δκres, that is, the central residual curvature E (see FIG. 9) of the residual curvature range Δκres becomes zero.

In the experiment of FIG. 8, each of the plurality of patterns of the reduction amount of the roller leveler 11, that is, each reduction amount of the inlet side 13 in the reduction amount distribution which changes linearly, acts on the long material 12. Long material 12 between rollers R1 to R11
The maximum of the absolute values of the curvature of, that is, the maximum curvature κ
In addition to obtaining max, long material 1 for each pattern
2. The residual curvature range Δκres, which is the difference between the maximum value and the minimum value of the residual curvature κres after being corrected by the roller leveler 11 when the initial curvature κini is changed, is obtained, and the maximum curvature when the residual curvature range Δκres is the minimum is obtained. Is the optimum maximum curvature κmax · opt. For example, according to the experimental result of FIG. 8, the optimum maximum curvature κmax · opt when the initial curvature κini / κyl is 0.5 and 1.0 is the yield curvature κ.
It turns out that it is about 3 times as large as yl.

According to the present inventor, this optimum maximum curvature κ
It was clarified for the first time that max · opt is determined by the initial curvature κini and the yield curvature κyl of the long material 12. Further long material 1
The difference in the material properties of 2 can be summarized by the yield curvature κyl, and if the yield curvature κyl is the same, the optimum maximum curvature κma
For the first time, it was clarified that the ratio of x · opt and yield curvature κyl is almost constant.

FIG. 10 shows the maximum curvature κmax when the residual curvature range Δκres is minimum, that is, the optimum maximum curvature κmax · opt, and this is associated with the initial curvature κini.
As a result, the optimum maximum curvature κmax ・ opt and the initial curvature κini
If and are made dimensionless with a yield curvature κyl, both κmax · opt,
It was clarified for the first time that the relationship of κini is represented by almost one straight line regardless of the yield curvature κyl. Therefore, the optimum maximum curvature κmax · opt can be expressed by Equation 1 which is a linear expression having the initial curvature κini of the long material 12 as a variable.

[0043]

[Equation 1]

It is considered that the maximum curvature κmax during correction is most affected by the amount of reduction on the entrance side 13. The maximum curvature κmax during correction increases with a linear function as the amount of reduction on the entrance side 13 increases.

Further, regarding the residual curvature κres when the correction is performed under such an optimum condition, the yield curvature κyl
It was first clarified by the inventor of the present invention that it can be arranged by. Minimum residual curvature κres ・ min and initial curvature κ
The relationship with ini is as shown in Fig. 11,
It can be expressed by one curve by making it dimensionless with the yield curvature κyl. That is, the minimum residual curvature κres ・ min
Is represented by a quadratic equation having the initial curvature κini of the long material 12 as a variable, and is represented by Equation 2.

[0046]

[Equation 2]

Therefore, according to the expression 2, it is understood that the minimum residual curvature κres · min can be calculated by a quadratic expression having the initial curvature κini of the long material 12 as a variable.

In the roller leveler 11, the amount of reduction on the inlet side 13 and the amount on the outlet side 14 are manipulated to further adjust the individual pressure reducing means B.
2, B4, B6, B8, B10 are operated so that the amount of reduction in the meantime has a linear distribution as described above. At this time, the maximum curvature κmax is equal to the amount of reduction Din on the inlet side 13 Be dominated. Therefore, the inventor of the present invention changes the plate thickness, the yield stress and the Young's modulus of the long material 12 to be corrected, and thus the yield curvature κyl of the long material 12, to change the entry side rolling reduction Din and the maximum curvature κmax. The relationship with and was determined experimentally.

The plate thickness of the long material 12 is 5, 10, 20, 30
FIG. 12 shows the relationship between the entrance-side reduction amount Din and the maximum curvature κmax in the case of mm. It was found that the inlet side reduction amount Din and the maximum curvature κmax have a linear relationship similar to that of FIG. 12 even when other yield stresses and Young's moduli are changed. Therefore, the maximum curvature κma is calculated by using the roller pitch L and the inlet side reduction amount Din.
The inventor of the present invention considered that x is represented by Expression 3. That is, this experimental result is sorted by the yield curvature κyl and the maximum curvature κma
An estimation formula of x is created as shown in Formula 3.

Κmax = a × (Din / L ² ) + b (3) The coefficients a and b of the equation 3 were obtained for various plate thicknesses, yield stresses and Young's moduli.

FIG. 13 shows the relationship between the coefficient a and the yield curvature κyl. From this, it can be seen that a = −5926κyl + 8.8034 (4).

FIG. 14 shows the relationship between the coefficient b and the yield curvature κyl. From this, b = 2417κyl ² −1.540κyl + 4.173 × 10 ⁻⁵ (5).

Therefore, a long material 1 having a yield curvature κyl
Given the maximum curvature κ max to be applied to 2,
The entrance-side reduction amount Din can be calculated from the equation 3, and the roller leveler 1 is adjusted so that the entrance-side reduction amount Din thus obtained is obtained.
The first and second actuators 20 and 21 of No. 1 can be controlled to correct the long material 12.

The present inventor has confirmed that the above equations 3 to 5 are highly accurate with reference to FIG. The ∘ mark in FIG. 15 indicates the maximum curvature κmax calculated by the above-mentioned Equation 3 proposed by the present inventor, and the × mark uses a constant coefficient without considering the difference in materials, κmax = 6.44 · The result of calculating the maximum curvature κmax using (Din / L ² ) (6) is shown. Referring to FIG. 15, it can be seen that the accuracy of Expressions 3 to 5 is good. According to the experiment by the inventor of the present invention, when the maximum curvature κmax is compared with the analysis result of the inventor of the present invention and the values obtained by the above equations 3 to 5, as shown in FIG. It can be seen that the approximation can be performed with an error of ± 5% or less and a small curvature of ± 10% or less, and it can be seen that the expressions 3 to 5 can be sufficiently put into practical use with high accuracy. Further, according to the calculation of Expression 6 shown as a comparative example, it is found that the error is large.

FIG. 16 is a block diagram showing the electrical construction of an embodiment of the present invention. The processing circuit 41 realized by a microcomputer or the like includes input means 42, 4
3, the initial curvature κin which is the initial shape of the long metal material 12
i is entered. This input means 42 is a roller leveler 1.
The steel plate of No. 2 steel plate may be configured to generate a signal representing a value obtained after being estimated and calculated by the rolling conditions of the rolling mill arranged on the upstream side of the long material 12. It can be configured. Further, the input means 43 gives a signal representing the material characteristic of the long material 12, that is, the yield curvature κyl calculated based on the plate thickness, the yield stress, and the Young's modulus. In the processing circuit 41, the calculation step shown in FIG. 17 is performed, and thereby the first and second actuators 20 and 21 are controlled. In this embodiment, the individual rolling-down adjusting means B2, B4, B6, B8, B10 are maintained in a state where they are set so that the distribution of the rolling-down amount changes linearly as described above.

FIG. 17 is a flow chart for explaining the operation of the processing circuit 41, by which the optimum reduction amount is set by the first and second actuators 20, 21. In step s1, the initial curvature κini which is the initial shape of the long metal material 12 is input. Step s2
Then, the target residual curvature κres · tar is set. Further, in step s4, the yield curvature κyl, which is a characteristic of the long metal material 12, and therefore the plate thickness, the yield stress, the Young's modulus and the like for the calculation are input. Furthermore, in the processing circuit 41, the roller pitch L of the roller leveler 11, the roller diameter, the number of rollers (11 in the above-described embodiment), etc. are input and set in advance.

In step s3, a method is set in which the elongated metal material 12 is passed once to the roller leveler 11 once, for example, and straightened. As another example, it may be set to perform correction of two or more passes.

At step s5, the initial curvature κ ini is substituted into the quadratic equation shown in the above equation 2 to obtain the minimum residual curvature κ re.
Calculate s · min / κyl.

At step s6, the minimum residual curvature κres · min / κyl calculated by the equation 2 is converted to the target residual curvature κres · tar /
Only when κyl or less and therefore the target residual curvature is satisfied, the process proceeds to the next step s7.

If the predicted value of the minimum residual curvature κres · min / κyl calculated in step s5 is the target residual curvature κres
・ If tar / κyl is exceeded, move to step s13,
In step s3 again, it is determined whether another pass is made instead of one pass. After the second pass,
Using the minimum residual curvature κres · min / κyl of the first pass as the initial curvature κini, the minimum residual curvature at step s5 is calculated. By repeating such a calculation operation, the predicted value κres · min / κyl of the minimum residual curvature obtained in step s5 is obtained.
Calculate the number of passes until the target residual curvature is less than or equal to the target residual curvature κres · tar / κyl and make a correction plan.

As another embodiment, when the predicted value of the residual curvature does not satisfy the target residual curvature in step s6, the process proceeds from step s13 to step s2, and the target residual curvature κres · tar is reset to a larger value. Is also possible.

At step s6, the minimum residual curvature κre
As described above, the predicted value of s · min / κyl is the target residual curvature κ.
If it is determined that it is less than res · tar / κyl, the process proceeds to the next step s7, where the optimum maximum curvature κmax · opt / κ
The calculation of yl is obtained by calculating the linear expression which is the above-mentioned Expression 1. The variable (κini / κyl) in Equation 1 is calculated in step s
The value input at 1 is used.

In step s8, the optimum maximum curvature κmaxopt calculated in step s7 is substituted as the variable κmax in the above-mentioned equation 3, and thereby the equation 4 and the equation 5 are used to reduce the pressure on the inlet side 13 from the equation 3. Calculate the quantity Din.

At step s9, the processing circuit 41 determines the first
Also, the second actuators 20 and 21 are controlled to set the inlet side reduction amount Din. Second actuator 2 on the outlet side 14
As described above, 1 is controlled and set in advance so that the amount of reduction on the outlet side 14 becomes zero.

Thus, the first and second actuators 2
With 0 and 21 being controlled, in step s10, correction is performed by the actual roller leveler operation. In step s11, the processing circuit 41 records and stores the data of the correction results in the memory. Due to the actual deformation of the long metal member 12 on the roller leveler 11 and the variation of the material properties, a difference occurs between the relationship between the inlet side reduction amount Din and the residual curvature κres set in step s8 and the actual correction result. It is determined by comparing in step s12. Therefore, in the processing circuit 41, by the learning control method that is a control method for correcting the control parameter based on the actual value, the value of the amount of reduction by the first actuator 20 with respect to the inlet side reduction amount Din obtained in step s8 Adjust the change. In this way, it is possible to set a reasonable inlet-side reduction amount by the first actuator 20 without trial and error in the actual operation of the roller leveler 11. Therefore, since the residual curvature κres becomes small, the number of times of re-correction, that is, the ratio can be reduced.

Further, as described above in connection with step s13, when the one-pass correction in which the correction is performed only once using the above-mentioned equation 2 regarding the residual curvature κres cannot obtain a sufficient correction effect, that is, Than the given residual curvature
If it is expected that the residual curvature predicted in step s5 will be large, it will also be possible to predict that it is necessary to correct a plurality of passes, and also set a large number of times. The excellent effect that can be achieved is achieved.

In the embodiment shown in FIGS. 8 to 17 using the roller leveler 11 shown in FIGS. 1 to 7 described above, the reduction amount distribution of the roller leveler 11 is linear. It was found for the first time that, according to another embodiment of the present invention, the amount of reduction can be further reduced by setting the downwardly convex curved shape. To explain this, with reference to FIG. 18, the roller leveler 11 described in connection with FIGS.
In place of setting the reduction amount in the rollers R1 to R11 linearly as indicated by reference numeral 31, reference numeral 3
It is important in the present invention to make a downward convex curve as shown by 2. Each roller R1 to R11
The roller pitches L are all equal. The amount of reduction is
It is set so that it gradually decreases from the entrance side 13 to the exit side 14. The characteristic that the power n is convex upward is shown by reference numeral 45 through FIG.

According to the present invention, as the distribution shape of the reduction amount, the i-th roller Ri from the entry side 13 (where i = 1 to 11) is applied to the entry side reduction amount Din and the exit side reduction amount Dout.
The rolling-down amount Di is expressed by Equation 7 as a power function of the ratio of the sum ΣLi of the inter-roller distances from the inlet to the i-th roller and the distance Ltotal from the inlet side 13 to the outlet side 14.

Di = Din− (Din−Dout) · (ΣLi / Ltotal) ⁿ (7) The inlet side reduction amount Din is the maximum curvature κma of the long member 12 being straightened.
most affects x. Therefore, first the target maximum curvature κmax ・ ta
By determining r and changing the amount of reduction Din on the inlet side 13, a numerical analysis of the correction process is performed to obtain the amount of inlet side reduction Din that achieves the target maximum curvature κmax · tar. In this analysis, the initial curvature κini
And the output side reduction amount Dout is set to zero.

The output-side reduction amount Dout most affects the residual curvature on the output side. Therefore, the output side reduction amount Dout is changed, and the numerical analysis of the correction process is performed to obtain the output side reduction amount Dout at which the residual curvature κres becomes zero, and this is referred to as an appropriate value of the output side reduction amount. In this analysis, the initial curvature κini
Is zero, and the inlet side reduction amount Din is a value determined by the above-mentioned method.

Output side reduction amount Dout at which the residual curvature κres becomes zero
Although there may be a plurality of solutions of, there is a case where the residual curvature range is obtained by changing the initial curvature κini using these solutions, and the residual curvature range is obtained when the solution of the maximum outlet side reduction amount Dout is used. It was found by the experiment of the inventor of the present invention that Therefore, the solution of the outlet side reduction amount κout where the residual curvature κres becomes zero is set as the appropriate outlet side reduction amount.

By setting the target value of the maximum curvature κmax to be 3.2 times the yield curvature κyl, the appropriate amount of reduction on the inlet side and the outlet side was obtained by changing the power n of the equation 7, and the experimental result of FIG. 19 was obtained. Thus, the distribution of the amount of reduction between the inlet side 13 and the outlet side 14 is observed.

Referring to FIG. 19, on the entrance side 13, each power number n near the position of the third roller R3.
It can be seen that the reduction amounts of are almost equal. This is almost the same as the roller position where the maximum curvature κmax is reached. Therefore, if the amount of reduction at the position where the long member 12 has the maximum curvature is the same, it can be seen that the maximum curvature is the same regardless of the value of the amount of reduction before and after that. Also, exit side 14
About the 9th roller R9, each power number n
It can be seen that the distributions of the rolling reductions intersect with.

Using the above-mentioned appropriate entrance and exit side reduction amounts, the residual curvature κres when the initial curvature κini is changed from −5 times to +5 times the yield curvature κyl is obtained by numerical analysis, and the initial curvature κini is calculated. According to the present inventor, the relationship between and the residual curvature κres was obtained as shown in FIG. For any value of n, each line has a substantially parabolic shape that is convex upward.

FIG. 21 shows the experimental results arranged as the relationship between the power value n and the residual curvature range Δκres / κyl based on these experimental results. From this FIG. 21, as the power value decreases, the residual curvature range Δκres / κyl
It can be seen that the residual curvature range Δκres / κyl becomes almost constant when the power n becomes about 1/4 or less.

FIG. 22 shows the experimental results of the inventor of the present invention, in which the rollers R1 to R11 when the power value n changes.
Shows the curvature κi / κyl in. The curvature is positive in the direction along each roller Ri. From this FIG. 22, the power value n
As becomes smaller, the distribution of curvature approaches a straight line from the upwardly convex curve, and accordingly the rate of change of curvature near the exit side 14 becomes smaller. Therefore, as the power value n becomes smaller, the residual value of the exit side 14 remains. It can be seen that the curvature κres is small.

Therefore, according to the present invention, the value of the power n
Is selected to be 1/4 or a value less than 1/4. When the power value n is too small, the configuration of the roller leveler 11 becomes complicated, so that, for example, n is 1/8 or more, 1 /
It is preferably 4 or less, and particularly preferably n = 1/4 as described above.

FIG. 23 is a simplified side view of a part of a roller leveler 11a according to another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts bear the same reference numerals. It should be noted that in this embodiment, the upper roller R
2 is supported by a pair of backup rollers 47, 48,
These backup rollers 47, 48 can be displaced by the individual rolling-down adjusting means B2a, B2b. The individual rolling-down adjusting means B2a, b2b are the same as the above-mentioned individual rolling-down adjusting means B2, B4, B6, B8, B10.
4 (see FIG. 2) may be used. The lower rollers R1, R3 are also backup rollers 49, 50, 5
Supported by 1. Other rollers R4 to R11
Also has the same configuration as described above.

FIG. 24 is a sectional view of a part of a roller leveler 11b according to still another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts bear the same reference numerals. For example, instead of the backup roller 47 of the upper roller R2 in FIG. 23, which uses the wedge piece 24 for the individual rolling-down adjusting means B2a, the shaft 52 coaxial with the backup roller 47 as shown in FIG.
The support shaft 55 is displaceable around an axis 54 that is eccentric from the axis 53 by a bearing 56.
Supported by. A worm wheel 57 is attached to the support shaft 55.
Is connected to the worm wheel 57.
, The worm wheel 58 is rotationally driven by a drive source 59 such as a motor.

FIG. 25 is a simplified sectional view taken along the line XXV-XXV of FIG. The worm 58 is the drive source 59.
The backup roller 47 is displaced by the angular displacement of the worm wheel 57, and thus the support shaft 55, which is driven by the backup roller 47, and the roller R2 supported by the backup roller 47 is also displaced to adjust the reduction amount. be able to.

As still another embodiment of the present invention, the lower rollers R1, R3, R5, R7, R9, R11 alone or in combination with the upper roller are displaced to adjust the distribution of the reduction amount. It may be configured to be able to.

[0082]

According to the present invention, the minimum residual curvature κres · min of the roller leveler can be calculated by the initial curvature κini of the long metal strip to be corrected, and the target can be obtained by passing the roller leveler only once. Residual curvature κres
-It can be judged whether it can be less than or equal to tar, or whether it is necessary to perform a corrective action a plurality of times, and workability can be improved.

Further, according to the present invention, the initial curvature κini
The optimum maximum curvature κmax ・ opt expressed by a linear equation is calculated by this, and this optimum maximum curvature κmax ・ opt is used for the long metal material to minimize the residual curvature after straightening by the roller leveler of the long metal material. It is the maximum curvature that acts and can be easily calculated by calculating this optimum maximum curvature κmax ・ opt, so that the pattern of the reduction amount of the roller leveler, for example, the entrance side reduction amount of the roller leveler is set, and this reduces the residual curvature. can do.

Further, according to the present invention, this optimum maximum curvature κ
When max · opt is given, when using a roller leveler in which the rolling reduction amount Di is distributed in a substantially linear manner and changes, the inlet side rolling reduction amount Din can be calculated, and the optimum maximum curvature κmax · opt is thereby calculated. It can be achieved easily and with high accuracy. The value a in the equation for calculating the inlet side reduction amount Din,
b is represented by a linear equation and a quadratic equation with the yield curvature κyl of the long metal material as a variable, and is easy to calculate. This yield curvature κyl can be calculated from the plate thickness, yield stress and Young's modulus of the long metal material.

Further, according to the present invention, the reduction amount distribution in the roller leveler is made smaller from the entrance side to the exit side, and moreover, it is set to a downwardly convex distribution shape between the entrance side and the exit side. As a result, the residual curvature can be reduced as compared with a configuration in which the amount of reduction is distributed in a substantially linear manner.

Further, according to the present invention, the rollers of the roller leveler are arranged vertically with an equal pitch L, and the ratio of the sum ΣLi of the inter-roller distances from the entrance side to the inter-roller distance Ltotal from the entrance side to the exit side. When expressed as a function of power n, n
Is selected to be 1/4 or less, and particularly n = 1/4, whereby the residual curvature of the long metal material after being straightened by the roller leveler can be made as small as possible, and the straightening effect can be sufficiently optimized. .

Further, according to the present invention, the vertical distance between the lower roller row and the upper roller row, the first and second actuators provided on the inlet side and the outlet side, for example, a double-acting hydraulic cylinder or a screw drive structure. By making it possible to change and adjust and at least one roller of the lower roller row and / or the upper roller row can be individually displaced by the wedge piece, the reduction amount can be changed at a high speed. In addition to being able to quickly respond to changes in the long metal material to be straightened, before straightening, for example, the upper roller is raised to reduce the amount of reduction, and It becomes possible to quickly perform operations such as making it easier for the bar to pass.

According to the present invention, each roller may be directly displaceable by a wedge piece, but each roller is supported by a pair of backup rollers, which are supported by the wedge piece or about an eccentric axis. Displacement drive may be performed by a support shaft that is angularly displaced, and by using such a backup roller, stable support of the roller can be performed.

[Brief description of drawings]

FIG. 1 is a side view of a roller leveler 11 according to an embodiment of the present invention.

2 is a simplified sectional view taken along the section line II-II in FIG.

FIG. 3 is a diagram for explaining the distribution of the reduction amount of the roller leveler 11.

FIG. 4 is a side view for explaining a reduction amount.

FIG. 5 is a side view for explaining a curvature.

FIG. 6 is a diagram showing a distribution of absolute values of curvature in the roller leveler 11.

FIG. 7 is a side view for explaining a curvature κ.

FIG. 8 is a graph showing the relationship between the maximum curvature κmax and the residual curvature range Δκres according to the experiment by the present inventors.

9 is a graph showing the relationship between the initial curvature κini of the long metal material 12 and the residual curvature κres after passing through the roller leveler 11. FIG.

FIG. 10 is a graph showing the relationship between the initial curvature κini and the optimum maximum curvature κmax · opt.

FIG. 11 is a graph showing the relationship between the initial curvature κini and the minimum residual curvature κres · min.

FIG. 12 is a graph showing the relationship between the entrance side reduction amount Din and the maximum curvature κmax.

FIG. 13 is a graph showing a value a with a yield curvature κyl of the long metal material 12 as a variable.

FIG. 14 is a graph showing a value b with a yield metal κyl of the long metal strip 12 as a variable.

FIG. 15 is a graph showing a comparison between the value of the maximum curvature κ max according to the estimation formula shown in Formula 3 and the analysis result of the present inventor.

FIG. 16 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 17 is a flowchart for explaining the operation of the initial circuit 41.

FIG. 18 is a diagram for explaining a state in which the roller leveler 11 is changed into a convex curvature shape under the reduction amount.

FIG. 19 is a diagram when the distribution of the amount of reduction between the inlet side 13 and the outlet side 14 of the roller leveler 11 is represented by a power function represented by Expression 7.

FIG. 20 is a graph showing a relationship with the residual curvature κres when the initial curvature κini is changed.

FIG. 21 is a value of a power of Expression 7 and a residual curvature range Δκres /
It is a graph which shows the relationship with κyl.

FIG. 22 is a graph showing the curvature κi / κyl of each of the rollers R1 to R11 when the power value n of Expression 7 is changed.

FIG. 23 is a simplified side view of a part of the roller leveler 11a according to another embodiment of the present invention.

FIG. 24 is a roller leveler 1 according to still another embodiment of the present invention.
It is a sectional view of a part of 1b.

25 is an X of FIG. 24 in the embodiment shown in FIG.
It is the simplified sectional view seen from XV-XXV.

FIG. 26 is a perspective view showing a rolled material 2 whose shape should be corrected by a roller leveler.

FIG. 27 is a perspective view showing a roller leveler.

FIG. 28 is a perspective view showing a rolled material 5 straightened by a roller leveler.

FIG. 29 is a diagram for explaining a state where repeated bending is performed by a roller leveler.

[Explanation of symbols]

11, 11a, 11b Roller leveler 12 Metal long material 13 Inlet side 14 Outlet side 15, 17 rows 20 First actuator 21 Second actuator 22, 47, 48, 49, 50, 51 Backup roller 24 Wedge piece 41 Processing circuit 42, 43 input means 52 shaft 55 support shaft 56 bearing 57 worm wheel 58 worm B2, B4, B6, B8, B10 individual rolling reduction means R1, R3, R5, R7, R9, R11 lower roller R2, R4, R6, R8, R10 Upper roller

Claims (21)

[Claims] 1. The minimum residual curvature κres · min after straightening of a long metal material by a roller leveler is defined as follows:
A constant is defined by the yield curvature κyl of the long metal strip to be corrected by the roller leveler, and is expressed by a quadratic equation with the initial curvature κini of the long metal strip as a variable. κini is calculated and the above 2
Substituting into the following formula, the minimum residual curvature κres ・ min is obtained, and the minimum residual curvature κres ・ min obtained in this way is compared to determine whether it is less than or equal to the target residual curvature κres ・ tar. How to straighten wood with a roller leveler. 2. The minimum residual curvature κre obtained by the calculation.
When s ・ min exceeds the target residual curvature κres ・ tar, the minimum residual curvature κres ・ min obtained by the previous calculation is substituted into the quadratic equation as the initial curvature κini to obtain the minimum residual curvature κres ・ min of this time. Is calculated and compared with the target residual curvature κres · tar, and this calculation comparison operation is repeated until the minimum residual curvature κres · min becomes equal to or less than the target residual curvature κres · tar, and the number of passes to be corrected by the roller leveler. The method for straightening a long metal sheet by a roller leveler according to claim 1, wherein 3. An optimum maximum curvature .kappa.ma which is the maximum curvature that occurs in a long metal strip during straightening with a roller leveler so that the residual curvature after straightening the long metal strip with a roller leveler is minimized.
x · opt is defined as a constant by the specification of the roller leveler and the yield curvature κyl of the long metal strip to be corrected by the roller leveler, and the initial curvature κini of the long metal strip is used as a variable 1
Expressed by the following formula, the initial curvature κini of the long metal to be straightened is calculated, and the optimum maximum curvature κmax ・ opt is calculated by substituting it into the above-mentioned linear formula. A straightening method using a roller leveler for a long metal material, which comprises straightening with a roller leveler in a pattern of the amount of reduction. 4. A roller leveler having a plurality of upper and lower rollers alternately arranged at equal pitches L from the inlet side to the outlet side and having a roll amount distribution in which a roll amount Di changes substantially linearly. When the maximum curvature κmax to be applied to the long metal material having κyl is given, the inlet side reduction amount Din is obtained from the following equation: κmax = a · (Din / L ² ) + b where a and b are , A value dependent on the yield curvature κyl, and straightening the long metal material by setting the roller leveler so as to obtain the inlet side reduction amount Din obtained in this way. . 5. The value a is expressed by a linear expression having a yield curvature κyl as a variable, and the value b is expressed by a quadratic expression having a yield curvature κyl as a variable. 4. A method for straightening a long metal material according to 4 by a roller leveler. 6. A roller leveler having a plurality of rollers arranged vertically from the entrance side to the exit side is used, and the reduction amount of the metal long material is reduced from the entrance side to the exit side, and the entrance side and the exit side are A straightening method using a roller leveler for a long metal material, characterized in that the distribution shape is convex downward between 7. The distribution shape of the reduction amount is defined by a pitch L in which upper and lower rollers are alternately arranged, an entrance-side reduction amount Din, an exit-side reduction amount Dout, a reduction amount Di of the i-th roller from the entry side, and an insertion amount. Total distance between rollers from side to i-th roller ΣLi, Distance between rollers from input side to output side Lt
When it is referred to as otal, it is represented by Di = Din− (Din−Dout) · (ΣLi / Ltotal) ⁿ , and n is selected to be ¼ or less, according to the roller leveler of the long metal material according to claim 6. Correction method. 8. The method for straightening a long metal material by a roller leveler according to claim 7, wherein n = 1/4. 9. A roller leveler for a long metal strip is used, in which a plurality of upper and lower rollers are alternately arranged from the inlet side to the outlet side, and the reduction amount Di changes little from the inlet side to the outlet side. The minimum residual curvature κres · min after that is determined by the specification of the roller leveler and the yield curvature κyl of the long metal strip to be corrected by the roller leveler, and the initial curvature κini of the long metal strip is used as a variable 2
Expressed by the following formula, the initial curvature κini of the long metal strip to be straightened is calculated, and the minimum residual curvature κres · min is calculated by substituting it in the quadratic formula to find the residual curvature κre of the long metal strip after straightening by the roller leveler.
Optimum maximum curvature κmax ・ opt that is the maximum curvature that occurs in a long metal strip during straightening with a roller leveler to minimize s
Is determined by the specification of the roller leveler and the yield curvature κyl of the long metal strip to be corrected by the roller leveler, and the initial curvature κini of the long metal strip is used as a variable 1
Expressed by the following equation, when the minimum residual curvature κres · min obtained from the quadratic equation is equal to or less than the target residual curvature, the initial curvature κini of the long metal material is substituted into the linear equation to obtain the optimum maximum curvature κmax.・ Opt is determined, and the obtained optimum maximum curvature κmax ・ opt is used to determine the inlet side reduction amount Din from the following equation: κmax ・ opt = a ・ (Din / L ² ) + b where a, b Is a value that depends on the yield curvature κyl, and is a straightening method using a roller leveler for a long metal strip by setting the roller leveler so as to obtain the entry-side reduction amount Din thus obtained. 10. The roller leveler is a roller leveler in which a plurality of rollers are arranged vertically from the entrance side to the exit side with an equal pitch L alternately, and a reduction amount distribution in which a reduction amount Di changes substantially linearly is used. The method for straightening a long metal material by a roller leveler according to claim 9. 11. The straightening of a metal long material by a roller leveler according to claim 9, wherein the amount of reduction of the metal long material is set to a distribution shape that is convex downward between the inlet side and the outlet side. Method. 12. The distribution shape of the reduction amount is defined by a pitch L in which upper and lower rollers are alternately arranged, an entrance-side reduction amount Din, an exit-side reduction amount Dout, a reduction amount Di of an i-th roller from the entry side, and an insertion amount. Total distance between rollers from side to i-th roller ΣLi, Distance between rollers from input side to output side Lt
12. When expressed as otal, it is represented by Di = Din− (Din−Dout) · (ΣLi / Ltotal) ⁿ , and n is selected to be ¼ or less.
A method for straightening the long metal material described by a roller leveler. 13. The method of straightening a metal long material by a roller leveler according to claim 12, wherein n = 1/4. 14. A roller leveler in which a plurality of rollers are alternately arranged vertically from the entrance side to the exit side, and the reduction amount Di gradually changes from the entrance side to the exit side, and an initial curvature κini of the metal long material. In response to the output from the signal generating means for generating the signal, and the signal generating means, the constant is determined by the specifications of the roller leveler and the yield curvature κyl of the long metal material,
And a first computing means for computing the minimum residual curvature κres · min after correction by the roller leveler by substituting the initial curvature κini input from the signal generating means into a quadratic equation having the initial curvature κini as a variable. In response to the output from the computing means, the minimum residual curvature κres
・ In response to the output from the signal generation means, a judgment means for comparing and comparing that min is less than or equal to a predetermined target residual curvature κres ・ tar, and the specifications of the roller leveler and the yield curvature κyl of the long metal material To determine the constant,
Also, the initial curvature κini input from the signal generating means is substituted into a linear expression having the initial curvature κini as a variable, and the optimum maximum curvature κmax that is the maximum curvature of the roller leveler for minimizing the residual curvature κres after correction. The minimum residual curvature κres obtained by the first calculating means in response to the outputs of the second calculating means for calculating opt, the first calculating means, the judging means and the second calculating means.
・ When min is less than the target residual curvature κres ・ tar, the second
A straightening device using a roller leveler for a long metal strip, comprising: a control means for driving and controlling the roller leveler so that the optimum maximum curvature κmax · opt obtained by the computing means is achieved. 15. In the roller leveler, upper and lower rollers are arranged with an equal pitch L, and the control means calculates the inlet side reduction amount Din from the following equation in response to the output of the second calculation means. Κmax · opt = a · (Din / L ² ) + b where the value a is expressed by a linear equation with the yield curvature κyl as a variable, and the value b with the yield curvature κyl as a variable 2 15. The straightening device for a long metal roller roll leveler according to claim 14, further comprising a third calculating means represented by the following equation, and achieving the inlet side reduction amount Din of the roller leveler obtained by the third calculating means. 16. The roller leveler has a distribution shape of the amount of reduction such that a pitch L in which upper and lower rollers are alternately arranged, an entrance side reduction amount Din, an exit side reduction amount Dout, and a reduction of the i-th roller from the entry side. Amount Di, the total of the inter-roller distance from the entrance side to the i-th roller ΣLi, the inter-roller distance Lt from the entrance side to the exit side
15. When expressed as otal, it is represented by Di = Din− (Din−Dout) · (ΣLi / Ltotal) ⁿ , and n is selected to be ¼ or less.
A straightening device using a roller leveler for the long metal material described. 17. A lower roller row in which a plurality of lower rollers are arranged at intervals from the inlet side to the outlet side, and a plurality of upper rollers are spaced from the inlet side to the outlet side, and between the lower rollers. An upper roller row to be arranged, a first actuator provided on the entrance side and changing and setting a vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row provided on the exit side. A second actuator that changes and sets the upper and lower intervals, and each roller of at least one of the lower roller row and the upper roller row are individually supported, and the displacement is driven in the vertical displacement direction perpendicular to the transport direction. And a drive adjusting means for adjusting and setting the roller leveler. 18. A lower roller row in which a plurality of lower rollers are arranged at intervals from the inlet side to the outlet side, and a plurality of upper rollers are spaced from the inlet side to the outlet side, and between the lower rollers. An upper roller row to be arranged, a first actuator provided on the entrance side and changing and setting a vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row provided on the exit side. And a second actuator for changing and setting a vertical interval between the roller and at least one of the lower roller row and the upper roller row are individually supported, and are displaceable in a horizontal direction perpendicular to the transport direction. A roller leveler comprising: a wedge piece; and a drive means for displacing and driving the wedge piece in the direction. 19. The lower roller row and / or the upper roller row are supported by a pair of backup rollers that support each roller, and the backup roller is displaceable by a wedge piece. 18. The roller leveler according to item 18. 20. A lower roller row in which a plurality of lower rollers are arranged at intervals from the inlet side to the outlet side, and a plurality of upper rollers are spaced from the inlet side to the outlet side, and between the lower rollers. An upper roller row to be arranged, a first actuator provided on the entrance side and changing and setting a vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row provided on the exit side. A second actuator for changing and setting an up-and-down interval between the upper roller and the lower roller row; a backup roller for individually supporting at least one of the lower roller row and the upper roller row; And a drive adjusting means for adjusting and setting by displacing and driving it in a vertical displacement direction perpendicular to the transport direction. 21. A row of lower rollers in which a plurality of lower rollers are arranged at intervals from the inlet side to the outlet side, and a plurality of upper rollers are spaced from the inlet side to the outlet side, and between the lower rollers. An upper roller row to be arranged, a first actuator provided on the entrance side and changing and setting a vertical gap between the lower roller row and the upper roller row, and a lower roller row and an upper roller row provided on the exit side. A second actuator for changing and setting the vertical gap between the backup roller and the backup roller, and a backup roller forming a pair for individually supporting at least one of the lower roller row and the upper roller row, and the backup roller. A roller leveler comprising: a support shaft that supports angular displacement about an axis that is eccentric from the axis of the roller, and drive means that drives the support shaft to perform angular displacement about the axis.