JPH07164051A - Method for controlling rolling reduction of roller leveler and control device for its implementation - Google Patents

Abstract

PURPOSE:To easily perform straightening without causing change in camber in the longitudinal direction of a metallic sheet by automatically adjusting for only the quantity of compensation of the vertical space between the final work rollers on the exit side in accordance with the change in rolling reduction on the entrance side of a roller leveler. CONSTITUTION:In straightening the shape such as elongation in the edge or center part of a metallic sheet by changing the inter-mesh IE on the entrance side, a change DELTAX of the rolling reduction on the entrance side is inputted in the device S115 for inputting change in rolling reduction on the entrance side. This command DELTAX is transmitted to a device S210 for controlling rolling reduction on the entrance side; a reduction motor A18 on the entrance side was thereby driven; the rolling reduction on the entrance side of a lower unit 4 is varied; further, the varied position is detected by a device E19 for detecting reduction on the entrance side; and the position is determined. An inter-mesh compensation quantity DELTAX.(ID/IE) on the exit side is determined by an arithmetic unit S314 for changing reduction on the exit side. The result is transmitted to a device S. 13 for controlling reduction position on the exit side, and the vertical space is automatically adjusted for the last work rollers on the exit side of the lower unit 4. Supposing IE and ID are the inter-mesh (thrust quantity) on the entrance and exit sides of the roller leveler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat metal plate or the like by correcting the shape of a metal plate such as a steel plate or a metal strip, and in particular, a roller leveler is used as a correction means to reduce the amount of reduction. The present invention relates to a control method and a controller for controlling the amount of reduction of a roller leveler used for implementing the method.

[0002]

2. Description of the Related Art Steel products such as steel plates and steel strips are often subjected to hot or cold rolling of a raw material, appropriate heat treatment, and then the shape thereof is corrected by a roller leveler. As shown in FIG. 1, the roller leveler is configured such that a plurality of rows of backup rollers, intermediate rollers, and work rollers are mounted on bearings fixed to the upper and lower units, and the product is pressed down unit by unit. By the way, the control of the amount of reduction of the product by the roller leveler is carried out by applying so-called inclining at the entrance side of the roller leveler (amount of pushing the roller into the product) and opening it at the exit side. It is a correction. The situation is shown in Fig. 2,
There, the inmesh is I _E on the entry side of the roller leveler,
There as I _D at the exit side, distance between the upper and lower work rolls, in the roller leveler entry _{side, L E = 2r + t-} I E, at the exit side L _D
= 2r + t- _ID ( _ID is usually a negative value), so either one of the upper and lower units is inclined from the entrance side to the exit side. Then, even when the intermesh _IE on the inlet side is changed in accordance with the shape of the steel plate or the like on the inlet / outlet side to perform the reduction to increase or decrease the correction ability, the inclination angle is always kept constant. There is. That is, the shape of the steel plate or the like is corrected by inclining either the upper unit or the lower unit of the roller leveler from the inlet side to the outlet side, and the reduction mark does not remain on the steel sheet after the reduction by the roller leveler. On the roller leveler exit side, the minimum distance between plate thicknesses such as steel plates is maintained. Furthermore, when changing the reduction amount of the roller leveler, either the above upper unit or the lower unit is put in and moved up and down horizontally from the original state at the exit side, as a result, the inclination angle of the unit is also changed when changing the reduction amount. It is always kept constant.

However, in the conventional rolling-down method in which the rollers are moved horizontally up and down from the original state when the rolling-down amount is changed, and the unit is tilted at a constant inclination angle, the work finally comes into contact with the material to be straightened on the roller leveler exit side. The rollers change, and as a result, the warp shape of the material to be straightened also changes in the longitudinal direction. The amount of reduction of the roller leveler is changed to correct the shape of the material to be corrected, such as the ear extension and belly extension.The original purpose is to change the longitudinal warp shape of the steel plate from its original state. Achievement is insufficient. Therefore, the straightening by the roller leveler of the steel plate or the like using the above-mentioned conventional method has a problem to be improved.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and even when a metal plate such as a steel plate is pressed down, the amount of reduction of a roller leveler in which the warp shape of the metal plate in the longitudinal direction does not change. An object of the present invention is to provide a control method and a control device.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the inventor has a method of correcting warp of a material to be straightened, even if the amount of reduction of a roller leveler is changed, when straightening the ear lobe, abdomen, etc. Various studies were conducted from the viewpoint of whether or not the value can be kept constant. As a result, it was noticed that the warp shape of the material to be straightened can be kept constant by correcting the vertical distance of the work rolls on the roller leveler exit side with respect to the intermesh change amount on the roller leveler entrance side. That is, when the material to be straightened has a certain warp shape and the input intermesh _IE is increased by Δx (mm),
Exit side end of the work roll spacing _{L D △ x (I D /} I E)
It was concluded that if only (mm) is corrected, the work roll that the material to be corrected finally contacts (that is, the final correction) does not change, and that this should be adopted as the roller leveler pressure reduction control system. . That is, according to the present invention, when the metal plate is pressed down by a roller leveler composed of a group of rollers to correct the shape of the metal plate, the exit side final work roller corresponding to the change Δx in the entrance side rolling down amount of the roller leveler. Is a method for controlling the amount of reduction of a roller leveler, which is characterized by automatically adjusting the vertical interval of Δx · (I _D / I _E ). Here, I _E and I _D are the intermesh (pushing amount, m
m). Further, as an apparatus that can be used for carrying out the method, in the present invention, in a roll leveler roll-down control device that corrects the shape of a metal plate, an inlet-side roll-down detection device that detects a change in the inlet-side roll-down amount of the roller leveler, the detection is performed. And a delivery side roll-down position control device for changing the delivery side roll-down position based on the calculated value. The present invention also provides a controller for controlling the amount of reduction of the roller leveler.

[0006]

In the present invention, when the shape of the metal plate is corrected by rolling with the roller leveler, the vertical distance of the output side final work roller is changed by Δx. ( _ID / Since only I _E ) is adjusted, the warp shape in the longitudinal direction of the material to be straightened is always kept constant, and the shape of the ear lobe, the belly belly or the like is straightened.
The contents of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of an apparatus configuration for carrying out the method for controlling the amount of reduction of a roller leveler according to the present invention. that is,
Since the lower unit 4 applies an inclination reduction to the material to be straightened 1, the inlet side reduction motor (A ₁ ) 8 of the lower unit 4, its reduction position detection device (E ₁ ) 9 and the inlet side reduction position control are performed by these. The device (S ₂ ) 10 for performing the above operation, the output side reduction motor (A ₂ ) 11 for the lower unit, and the reduction position detection device (E)
₂ ) 12 and a device (S ₄ ) 13 for controlling the outlet side reduction position by these, and an input device (S ₁ ) 15 for the inlet side reduction amount Δx, and the inlet side reduction amount change to the outlet side reduction amount. It is composed of an arithmetic unit (S ₃ ) 14 that corrects for changes.

Next, according to the present invention using the above apparatus configuration
A method of controlling the reduction amount will be described. First, the metal plate 1 of the material to be straightened
The lower unit 4, which applies tilt reduction to the
I_E And outgoing intermesh I_D Respectively, respectively
Position control device (S₂) 10, Depressurizing position control device (S_Four
 ) 13 is set. After that, place the metal plate 1 on the roller leveler.
It is passed through the main body 2 and its shape is corrected.
Lower position control device (S₂ ) 10 and exit side roll-down position control device
(S_Four ) By changing the rolling position of 13, the lengthwise direction of the metal plate
Match the warp shape of the direction to the target value. And at this point
Ingress and Egress Intermesh I_E , I_D Input side reduction
Detector (E₁ ) 9, Output side pressure drop detector (E₂ ) 12 in
read. After that, change the shape of the metal plate such as the ear and belly.
Entry side intermesh I_E When changing and correcting
Is an input-side reduction amount input device (S₁ ) Change in inlet pressure to 15
Enter the amount Δx. After that, this command Δx is
Lower control device (S₂ ) 10 is transmitted to the inlet side reduction motor
(A₁ ) 8 is operated to reduce the amount of reduction on the inlet side of the lower unit 4.
Change, and the change position is changed to the inlet side pressure sensing device (E
₁ ) 9) to determine the position and change the outlet pressure
Further calculation device (S ₃ ) 14, the outgoing intermesh correction
Quantity Δx ・ (I_D / I_E ) Is calculated. This result is
Lateral pressure reduction position control device (S_Four ) 13 is transmitted to the lower unit
Automatically adjusts the vertical spacing of the last work roller on the exit side of
To do. In addition, the outlet pressure reduction calculation device (S₃ ) 1
In the calculation in 4, the input Δx is I_D / I_E Simple acting
However, the characteristics of the roller leveler and the characteristics of the material to be straightened are
It may be possible to multiply by a constant value depending on the sex.

FIG. 3 is a diagram for explaining the concept of intermesh correction described above.

[0010]

EXAMPLE With the same device configuration as the roller leveler shown in FIG.
The shape of the metal plate was corrected. At that time, the size and number of each roller were as follows. That is, 40φ x
The work rollers 5 of 1400 mm were arranged at an upper 8 and lower 9 at a pitch of 45 mm, and the intermediate rollers 7 of φ40 × 1350 mm were arranged at upper 9 and lower 9. The backup rolls were segmented, and the rolls of φ80 × 66 mm were arranged in five rows in a staggered manner. In addition, the upper work rolls were all horizontal, and the lower work rolls were inclined down with the intermesh on the inlet side and the outlet side.

A JIS colored zinc iron plate 0.35 mm (thickness) × 914 mm (width) was used as a material to be corrected, and its shape was corrected. As a result, the ingress mesh I _E is increased by +
0.8 mm, when the exit-side interface mesh I _D to -0.6Mm, just the longitudinal direction of the warp becomes zero in both up / down. On the other hand, the zinc iron plate in this state was straightened by the conventional method, and the lower unit was set to +1.5 m parallel to the inlet and outlet sides.
When the reduction is increased by m, the warp in the longitudinal direction is 1.
It became 5 mm / 1 m.

Further, the present invention is applied to this state, and only the entrance side of the lower unit 4 is pressed down by +1.5 mm (Δx).
At this time, output side pressure under changing operation device (S ₃₎ at 14 △ x ·
(-0.6 / 0.8) is calculated, and the calculated value (-1.
1mm), the output side down mesh is corrected by -1.1mm, and the output side intermesh is (-0.6-1.1 =)-
It was set to 1.7 mm. This numerical value was transmitted to the outlet side pressure reduction position control device (S ₄ ) 13, and the vertical interval of the outlet side final work roll of the lower unit was automatically adjusted. As a result, the warp in the longitudinal direction of the zinc-iron plate could be kept at 0 in both the upper and lower parts, and ear extension and abdominal extension could be corrected.

[0013]

According to the present invention, once the inlet and outlet intermesh is set by the roller leveler and the warp shape is set to the target value, when the same material is corrected thereafter, the shape of ear lobe and belly stretch is corrected. Is changed by the in-mesh on the input side, and the in-mesh on the output side is automatically corrected according to the changed amount. As a result, it has become possible to easily correct the shape of the ear lobe, abdominal belly, etc. in a state where the inclination of the lower unit is changed and the warped shape of the material to be corrected is not changed in the longitudinal direction.

[Brief description of drawings]

FIG. 1 is an example of an apparatus configuration for carrying out a roll leveler rolling reduction method according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between upper and lower work roll positions and an intermesh on a roller leveler.

FIG. 3 is a diagram showing a concept of outgoing intermesh correction according to the present invention.

[Explanation of symbols]

 1 Material to be straightened (metal plate) 2 Roller leveler body 3 Roller leveler upper unit 4 Roller leveler lower unit 5 Work roll 6 Backup roll 7 Intermediate roll 8 Input side pressure reduction motor 9 Input side pressure reduction detection device 10 Input side pressure reduction position control device 11 Output side pressure reduction Motor 12 Output side pressure reduction position detection device 13 Output side pressure reduction position control device 14 Output side pressure reduction change calculation device 15 Input side pressure reduction change amount input device 16 Input side opening / closing motor 17 Output side opening / closing motor 18 Quick open control device

Claims (2)

[Claims] 1. When the metal plate is pressed down by a roller leveler composed of a group of rollers to correct the shape of the metal plate, the output side final work roller of the output side final work roller is corresponding to the change Δx in the rolling down amount of the roller leveler. The vertical spacing is Δx · ( _ID / _IE )
A method for controlling the amount of reduction of a roller leveler, which is characterized by automatically adjusting only. Here, I _E and I _D are intermesh (pushing amount,
mm), and usually _ID has a negative value. 2. A roller leveler roll-down control device for correcting the shape of a metal plate, an inlet-side roll-down detection device for detecting a change in the inlet-side roll-down amount of the roller leveler, and an output-side roll-down amount of the roller leveler using the detected value. And a delivery side reduction position control device for changing the delivery side reduction position based on the calculated value.