JPH07303910A - Method for controlling shape in multistage rolling mill and device therefor - Google Patents

Abstract

PURPOSE:To exactly adjust the amount of bending and to improve the capacity of shape correction by bending intermediate rolls in accordance with the difference between elongations in the middle part and end parts and bending work rolls in accordance with the rate of change in the width direction of elongation in the ad parts. CONSTITUTION:This method is a control method of a multi roll mill 10 for controlling the shape of a rolled stock W by using the multistage rolling having a pair of upper and lower work rolls 11, 12, intermediate rolls 13, 14 and back-up rolls 15, 16 and adjusting the amount of bending of the intermediate rolls and work multistage rolling. The elongations in the longitudinal direction in the middle part and end parts in the width direction of this rolled stock are respectively measured and the intermediate rolls 13, 14 are bent in accordance with the difference between elongations in the middle part and end parts. And the work rolls 11, 12 are bent in accordance with the rate of change in the width direction of the elongation in the end parts. In this way, it is not necessary to express the elongation distribution of the rolled stock by a high-order polynomial, then, shape measuring points are reduced, so control operation speed is quickened and control is simple, so control operation is quickened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape control method and shape control for a multi-high rolling mill, which uses a multi-high rolling mill having a pair of upper and lower work rolls, an intermediate roll and a reinforcing roll. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, a shape control method for a multi-high rolling mill, in which the shape of a rolled material is controlled using a multi-high (six high-high rolling) mill having a pair of upper and lower work rolls, an intermediate roll and a reinforcing roll, and A shape control device is known from JP-A-56-66307. This multi-stage rolling mill has a bending device for bending work rolls and intermediate rolls,
A moving device that horizontally moves the intermediate roll, and a shape detector that detects the elongation in the longitudinal direction at each position in the width direction of the rolled material are provided, and depending on the elongation of the rolled material that the shape detector detects. By rolling the upper and lower work rolls and intermediate rolls convexly or concavely toward the rolled material, or by moving the upper and lower intermediate rolls horizontally in opposite directions, the rolled material can be rolled into a desired cross-sectional shape. I have to. As a result, not only a simple distribution in which the longitudinal elongation of the rolled material in the width direction during rolling is convex or concave, but also W-shaped or M-shaped composite elongation is restored.

In order to control the rolled material into a desired shape, the axial elongation of the rolled material is detected at each point in the width direction of the rolled material, and the widthwise distribution of the detected elongation is accurately determined. Need to be expressed in. Conventionally, the distribution represented by a higher-order equation including higher-order terms of the fourth or higher order is known, for example, from Japanese Patent Laid-Open No. 55-42165. If the elongation distribution in the width direction of a rolled material is expressed by a polynomial that includes higher-order terms of the third order or higher, it is generally difficult to directly judge the actual shape of the plate shape from the polynomial. There is a problem that the shape is not clearly related to the bending direction and the bending amount of the work rolls and the intermediate rolls, and the shape control of the rolling mill cannot be properly performed.

Therefore, as an approximate expression for evaluating the distribution of the elongation of the rolled material in the width direction, a predetermined position existing between the center and the width end of the rolled material is used as a boundary, and the center of the width is defined from the boundary. The shape of the rolled material in the central region on the side is approximated by a quadratic equation, and the shape of the rolled material in the end region on the plate width end side of the boundary is also approximated by a quadratic equation. Japanese Patent Laid-Open No. 4-178208 proposes a shape control method for bending the work roll or the intermediate roll or moving the intermediate roll in the horizontal direction.

[0005]

However, also in the shape control of the rolled material according to Japanese Patent Laid-Open No. 4-178208, the distribution of the elongation in the width direction of the rolled material must be approximated by a quadratic equation. In order to accurately express the distribution of γ by a quadratic equation, it is necessary to provide a large number of measurement points in the width direction of the rolled material and measure the elongation at each point. Further, depending on the capacity of the control device, there is a problem that as the number of measurement points increases, the calculation takes more time, the feedback cycle becomes longer, and accurate shape control becomes difficult.

The present invention has been made in order to solve such a problem. According to the distribution of the elongation of the rolled material in the width direction, the shape data is not expressed by a higher-order expression including terms of the second or higher order. An object of the present invention is to provide a shape control method and a shape control device for a multi-high rolling mill, which is capable of accurately adjusting the bending amounts of the work rolls and the intermediate rolls and which has an excellent ability to correct the shape such as complex elongation.

[0007]

In order to achieve the above-mentioned object, according to the present invention, a multi-stage rolling mill having a pair of upper and lower work rolls, an intermediate roll and a reinforcing roll is used. In the shape control method of the multi-stage rolling mill that controls the shape of the rolled material by adjusting the bending amount of the work rolls, the elongation in the longitudinal direction of the central portion and the end portion in the width direction of the rolled material is measured, and the central portion And bending the intermediate roll according to the difference value of the elongation of the end, bending the work roll according to the rate of change of the elongation of the end in the width direction, shape control of the multi-stage rolling mill A method is provided.

According to another invention, there is a pair of upper and lower work rolls, an intermediate roll and a reinforcing roll, and a work roll bending device for bending the work roll and an intermediate roll bending device for bending the intermediate roll. Using a multi-stage rolling mill equipped with, in the shape control device of the multi-stage rolling mill to control the shape of the rolled material by adjusting the bending amount of the intermediate roll and the work roll, at least the central portion in the width direction of the rolled material. Shape detecting means for respectively measuring the elongation of the end portion in the longitudinal direction, and first driving the intermediate roll bending device by an operation amount according to the difference value of the elongation between the central portion and the end portion measured by the shape detecting means. The driving means and the work load by an operation amount corresponding to the change rate of the extension of the end portion in the width direction measured by the shape detecting means. Characterized in that it comprises a second driving means for driving the bending device, the multi-high rolling mill of the shape control device is provided.

Preferably, the shape detecting means divides the central portion of the rolled material, the outermost portion of the end portion and the adjacent inner portion adjacent to the outermost portion into a plurality of regions, and divides each into a plurality of regions. The elongation is measured in each of the areas, and the first driving means is configured to calculate the difference from the average value of the elongations measured in the central areas and the average value of the elongations measured in the outermost areas. The second driving means obtains the value, and the second driving means obtains the rate of change from the average value of elongation measured in each region of the outermost part and the average value of elongation measured in each region of the adjacent inner part. good.

[0010]

The work roll which is in direct contact with the rolled material is bent by driving the work roll bending device by the second drive means by an operation amount corresponding to the rate of change of the elongation at the end of the rolled material in the width direction, thereby rolling. The shape of the end portion of the material is restored, and the intermediate roll is operated by the first driving means by the intermediate roll bending device by an operation amount corresponding to the difference in elongation between the central portion and the end portion in the width direction of the rolled material. Bending is performed by driving, and thus the shape of the entire strip width of the rolled material is restored.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a schematic overall configuration of a rolling mill 10. The rolling mill 10 is a 6-high (multi-high) rolling mill and has a pair of upper and lower work rolls 11 and 12 and a diameter larger than that of the work rolls. Intermediate rolls 13 and 14 and reinforcing rolls 15 and 16 having a larger diameter than the intermediate rolls. The work rolls 11 and 12 sandwich the rolled material W of the work between these two rolls and roll it. The rolling load of the work rolls is applied by the upper and lower auxiliary rolls 15 and 16 via the intermediate rolls 13 and 14. To be A hydraulic pressure reduction device 23 is arranged below the roll shaft of the lower auxiliary roll 16, and a rolling load is applied to the lower auxiliary roll 16 by the reduction device 23. A hydraulic control circuit 24 is connected to the pressure reducing device 23, and an operating hydraulic pressure is supplied from the hydraulic control circuit 24. On the other hand, a load cell (not shown) is attached to the upper auxiliary roll 15 which receives the rolling load of the lower auxiliary roll 16 to measure the rolling load.

The roll diameters of the work rolls 11 and 12, the roll body length, and the distance between chocks are appropriately selected according to the material to be rolled, but in the present embodiment, they are 135 mm, 850 mm, and 10 mm, respectively.
It is 75 mm. A pair of upper and lower work roll benders 21 (see FIG. 1 and indicated by arrows in FIG. 2) are arranged at both ends of the work roll shafts 11a and 12a, respectively. Bending (bending) 11a and 12a in a direction in which the rolled material W, which is a workpiece, is convex (a positive direction in FIG. 3) or in a direction in which the rolled material W is concave (a negative direction in FIG. 4). ), Mainly correcting the shape of the end of the rolled material W.

The roll diameters of the intermediate rolls 13 and 14, the roll cylinder length, and the distance between chocks are also appropriately selected according to the material to be rolled, but in the present embodiment, they are 300 mm and 85 mm, respectively.
It is 0mm and 1660mm. A pair of upper and lower intermediate roll benders 22 are provided at both ends of the intermediate roll shafts 13a and 14a, respectively.
(See FIG. 1; indicated by an arrow in FIG. 2) is provided, and the roll bender 22 allows the roll shaft 13a,
14a is bent (bending) in a direction in which it is convex with respect to the rolled material W as a workpiece (a positive direction shown in FIG. 3) or in a direction in which it is concave with respect to the rolled material W (a negative direction shown in FIG. 4). The entire shape of the rolled material W is corrected. Although not shown in the drawings, the intermediate rolls 13 and 14 include the intermediate roll 1.
An intermediate roll shift is provided for moving the intermediate rolls 3, 14 in the axial direction (see FIG. 2), and the intermediate rolls 13, 14 can be moved in opposite directions to correct the elongation distribution in the width direction of the rolled material. You can do it.

Hydraulic pressure control circuits 25 and 26 are connected to the work roll bender 21 and the intermediate roll bender 22, respectively, and the work rolls 11 and 12 and the intermediate rolls 13 and 14 are controlled by the hydraulic pressures supplied from the corresponding hydraulic pressure control circuits.
Is bent to the above-mentioned plus side or minus side. The hydraulic control circuits 24 to 26 are
It is composed of control elements such as solenoid valves that regulate the hydraulic pressure from a hydraulic source (not shown) and supply it to the corresponding hydraulic pressure reducing device 23 and roll benders 21 and 22. These electromagnetic valves and the like are supplied from the controller 30. The operation is controlled by the control signal. The work roll bender 21 constitutes a part of the work roll bending device, and the hydraulic control circuit 25 and the controller 30 constitute a part of the second drive means. Further, the intermediate roll bender 22 constitutes a part of the intermediate roll bending device, and the hydraulic control circuit 26 and the controller 30 constitute a part of the first drive means.

Each roll of the 6-high rolling mill 10 is capable of forward and reverse rotation, and the roll W can be reciprocally rolled by rotating the roll forward and backward. Therefore, the deflector rolls 32 and 33 and the winders 34 and 35 are arranged in front of and behind the rolling mill 10, respectively. When rolling in the direction indicated by arrow A in FIG. It is wound by the winder 35 via the roll 33.

Before and after the rolling mill 10, spray devices 38 and 39 for injecting a coolant (or a lubricant) toward the upper and lower work rolls 11 and 12, respectively, are arranged. Work roll 11,
Twelve nozzles are provided at predetermined intervals in the axial direction, and the coolant injection amount of each nozzle is controllable. When the rolled material W is rolled in the direction indicated by the arrow A in FIG. 1, each nozzle of the rear spray device 38 injects a coolant having an adjusted injection amount. From each nozzle of the spray device to the work roll 11,
The thickness distribution in the width direction of the rolled material W to be rolled, that is, the width direction distribution (shape) of the elongation in the longitudinal direction can also be controlled by adjusting the distribution of the injection amount of the coolant injected into the roll 12.

As shown in FIG. 5 (b), the deflector roll 32 is constructed by arranging a large number (30 in the embodiment) of small rolls 32a that rotate integrally with each other on the same axis. Has a known sensor for measuring the tension applied to the outer circumference of the roll. Each sensor is connected to the input side of the controller 30 and supplies the sensor output to the controller 30. The shape detector 32b (FIG. 1) is configured by these sensors. The tension detected by each sensor corresponds to the elongation of the rolled material W in the longitudinal direction, and the output distribution of the shape detector 32b corresponds to the elongation distribution (plate shape) as shown in FIG. 5 (a). Become. Deflector roll 32 and small roll 32
The width of each roll of a varies depending on the plate width of the rolled material to be rolled, but is 780 mm and 26 mm (30 zones) in the examples. Therefore, in the embodiment, the elongation measured by one small roll 32a means that the average value of the elongation of the region of the rolled material W in the width direction of 26 mm is detected. Then, in the embodiment, the width direction of the rolled material W is divided into a number of regions corresponding to the roll width of the small rolls, and the elongation of the central portion C of the rolled material W corresponds to the four central rolls 32a. The sensors of the four small rolls 32a corresponding to the respective positions detect the elongation of both ends (E + Q) of the rolled material W.

The deflector roll 33 also has the same structure as the deflector roll 32, and the sensors of the small rolls forming the shape detector 33b of the deflector roll 33 are also connected to the input side of the controller 30, and the sensor output is controlled by the controller. Supply to 30. The controller 30 includes an input / output device (not shown), central processing unit, RO
It is composed of a storage device of M and RAM, an operation panel for inputting a command signal by an operator, and the like. In response to a rolling start command from the operation panel, the controller 30 executes the shape control program stored in the ROM, and based on this program, the shape detector 32b,
The elongation data of the rolled material W is fetched from 33b, and the bending amount (bending operation amount) of the work rolls 11 and 12 and the intermediate rolls 13 and 14 by the work roll bender 21 and the intermediate roll bender 22 is calculated, and the calculated bending amount is obtained. The control signal is output to the hydraulic control circuits 25 and 26 via the input / output device. A monitor device 31 is connected to the output side of the controller 30 to display the elongation distribution of the rolled material W detected by the shape detectors 32b and 33b described above.

Next, the rolling procedure (shape correcting procedure) of the rolled material W by the controller 30 will be described with reference to FIGS. 6 and 7. FIG. 6 shows a shape correction procedure by the intermediate roll bender, and this program is executed when a rolling start command is input from the operation panel. The shape correction by the intermediate roll bender controls the operation amount of the intermediate roll bender 22 based on the elongation data of the central portion C and the outermost end portion E of the rolled material W from the shape detectors 32b and 33b. 30 first reads the target value MEC (step S
10). FIG. 8A shows a target elongation distribution of the rolled material W, and this elongation distribution is set in consideration of the post-rolling process and the like. The above-mentioned target value MEC is the average value of the elongations obtained at the central portion (C region shown in FIG. 5A) and the end portion (E region shown in FIG. 5A) of this target elongation distribution. The target value MEC is preset as a difference value (a value obtained by subtracting the central part average value from the end part average value), and the target value MEC is stored in the storage device of the controller 30.

Next, the controller 30 operates in step S1.
In step 1, the elongation data of the above-described C and E regions of the rolled material W detected by the shape detector 33b is read.
When the rolled material W is wound and rolled in the direction opposite to the direction indicated by the arrow A in FIG. 1, the elongation data detected by the shape detector 32b is used. Then, the average values MC and ME of the elongations of the central portion C and the end portions E (which may be E + Q) of the rolled material W are calculated based on the detected elongation values (step S12). There is no particular limitation on how many sensors the detection values are averaged to obtain the average elongation values MC and ME, but the average elongation value MC in the case of the embodiment is as shown in FIG.
The average elongation value ME is calculated from the average value of the detection values of the four central sensors corresponding to the area C shown in FIG.
It is obtained from the average value of the four sensor detection values corresponding to the two left and right E regions shown in (a). Note that this average value may be a simple average value of the detection values of each sensor,
The detection value of each sensor may be multiplied by different weighting factors and then the average value may be obtained.

Then, the difference between the average elongation ME at the end and the average elongation MC at the center is calculated (step S13),
In order to compare this with the above-mentioned target value MEC, the difference DEC between the above-mentioned difference value (ME-MC) and the target value MEC is obtained (step S14). DEC = (ME−MC) −MEC If the difference DEC is a value within a predetermined error range (zero difference), the bending amount of the intermediate rolls 13 and 14 is not corrected (step S16), and will be described later. If the difference DEC exceeds the predetermined error range and is negative, then the process proceeds to step S17, in which the operation amount of the intermediate roll bender 22 is corrected (by day crease), and the minus value shown in FIG. Bend in the direction.
On the other hand, when the difference DEC exceeds the predetermined error range and is positive, the process proceeds to step S18, the operation amount of the intermediate roll bender 22 is corrected (increased), and bending is performed in the positive direction shown in FIG. .

Various methods can be adopted as the method for correcting the bending amount. For example, the difference DEC is displayed on the monitor device 31 described above, and the operator operates the operation panel while watching this display to operate the intermediate roll bender 22. May be adjusted, or the operation amount of the intermediate roll bender 22 may be feedback-controlled by a known PID control method or the like according to the difference DEC. In any case,
The controller 30 outputs a control signal according to the difference DEC to the hydraulic control circuit 26 to correct the operation amount of the intermediate roll bender 22.

When the correction of the bending amount is completed, the process proceeds to step S19, and it is determined whether or not the rolling is completed. If the answer is no (No), the procedure returns to step S11 described above, and the procedure following step S11 is repeatedly executed.
In the affirmative case (Yes), the program is ended. Next, a shape correction procedure by the work roll vendor of FIG. 7 will be described. This program is also executed by inputting a rolling start command from the operation panel. The shape correction by the work roll bender is performed by changing the widthwise change rate of the elongation of the end of the rolled material W from the shape detectors 32b and 33b, more specifically, the elongation of the outermost end E and the adjacent inner end Q. The operation amount of the work roll bender 21 is controlled from the data, and the controller 30 first reads the target value MEQ (step S20). This target value MEQ is also the rate of change in elongation at the end of the target elongation distribution shown in FIG. 8A, in this embodiment the outermost end (E region shown in FIG. 5A) and the adjacent inner end ( This target value MEQ is set in advance as a difference value (value obtained by subtracting the Q area average value from the E area average value) of the average values of the elongations obtained respectively in (Q area shown in FIG. 5A).
Is also stored in the storage device of the controller 30.

Next, the controller 30 proceeds to step S2.
In step 1, the elongation data of the E and Q regions of the rolled material W detected by the shape detector 33b is read. When the rolled material W is wound and rolled in the direction opposite to the direction indicated by the arrow A in FIG. 1, the elongation data detected by the shape detector 32b is used. Then, the average values ME and MQ of the elongations of the outermost end E and the adjacent inner end Q of the rolled material W are calculated based on the detected elongation values (step S22). The average elongation value ME in the case of the embodiment is obtained from the average value of the detection values of the four sensors corresponding to the two left and right E regions shown in FIG. 5A, and the average elongation value MQ.
Is calculated from the average value of the detected values of the four sensors corresponding to the two left and right Q regions shown in FIG. Also in this case, the average value is calculated from the following formula, for example, by weighting the detection value of each sensor.

ME = (E1 × 90 + E2 × 110 + E3 × 110 + E4 × 90) ÷ 400 where E1 to E4 are the detection values of the four sensors in the E region. Then, the difference value between the average elongation value ME at the outermost end and the average elongation value MQ at the adjacent inner end is calculated (step S23), and the difference value described above is compared with the target value MEQ described above. DE between (ME-MQ) and target value MEQ
Q is obtained (step S24).

DEQ = (ME-MQ) -MEQ If the difference DEQ is a value within a predetermined error range (zero difference), the bending amounts of the work rolls 11 and 12 are not corrected (step S26). 4). If the difference DEQ exceeds the predetermined error range and is negative, the process proceeds to step S27, in which the operation amount of the work roll bender 21 is corrected (decisioned), and the process shown in FIG. Bend in the negative direction shown in.
On the other hand, when the difference DEQ exceeds the predetermined error range and is positive, the process proceeds to step S28, the operation amount of the work roll bender 21 is corrected (increased), and bending is performed in the positive direction shown in FIG. .

Regarding this method of correcting the bending amount, for example, the difference DAQ is displayed on the monitor device 31 described above, and the operator operates the operation panel while watching this display to adjust the operation amount of the work roll bender 21. Alternatively, the operation amount of the work roll bender 21 may be feedback-controlled by a known PID control method or the like according to the difference DEQ. In any case, the controller 3
0 outputs an E control signal to the hydraulic control circuit 25 according to the difference DEQ to correct the operation amount of the work roll bender 21.

When the correction of the bending amount is completed, the process proceeds to step S29, and it is determined whether or not the rolling is completed. If the answer is no (No), the procedure returns to step S21 described above, and the procedure following step S21 is repeatedly executed.
In the affirmative case (Yes), the program is ended. In addition, by repeating the pass several times, the rolled material W
In the case of rolling, the steps from step S10 described above may be automatically executed at each pass start, or the operation panel is operated at each pass to supply the rolling start command to the controller 30. You may do it.

FIG. 8 shows a typical example in which the shape of the rolled material W is corrected by the above-described two shape correction controls, and when the shape is a convex shape below the target shape ((b) in FIG. 8). Case), the work roll bender (WRB) 21 is corrected to the increment (plus) side to correct the shape of the end of the rolled material W mainly, and the intermediate roll bender (IMRB) 2
2 is also corrected to the increase (plus) side and corrects the overall plate width shape of the rolled material W. The work rolls 11 and 12 are smaller in diameter and easier to bend than the intermediate rolls 13 and 14, and are in direct contact with the work to roll it, which has a great influence on the shape correction of the end of the work. 14
Influences the work through the work rolls 11 and 12, so that the overall plate width shape of the work is corrected in the flat direction or in the opposite direction.

Similarly, when the shape exceeds the target shape and is convex upward (case of FIG. 8C), the work roll bender (WRB) 21 is corrected to the decrease (minus) side and the rolled material is rolled. While mainly correcting the shape of the end portion of W, the intermediate roll bender (IMRB) 22 is also corrected to the decrease (minus) side, and the overall plate width shape of the rolled material W is corrected.

When the rolled material W has an M-letter shape (case (d) of FIG. 8), the work roll bender (WRB) 21 is corrected to the decrease (minus) side, and the intermediate roll bender (IMRB). 22 is an increase (plus)
When it is corrected to the side, the rolled material W is corrected in the target shape direction. Further, when the rolled material W has a W-letter shape (case (e) in FIG. 8), the work roll bender (WR
When B) 21 is corrected to the increment (plus) side and the intermediate roll bender (IMRB) 22 is corrected to the decrease (minus) side, the rolled material W is corrected in the target shape direction.

In the present invention, the shape control of the rolled material W is performed by adjusting the bending amounts of the work roll bender and the intermediate roll bender. In addition to the shape control of the present invention, the shape control of the conventionally known intermediate roll is performed. Shape control may be performed by combining shift control, coolant control, tilting control of work rolls and / or intermediate rolls, and the like.

[0033]

As is apparent from the above description, according to the shape control method and the shape control apparatus for a multi-stage rolling mill of the present invention, the central portion in the width direction of the rolled material and the elongation in the longitudinal direction of the end portion thereof are respectively extended. It was measured, and the intermediate roll was bent according to the difference in elongation between the central part and the end part, and the work roll was bent according to the change rate of the end part extension in the width direction. Since it is not necessary to express the elongation distribution of the rolled material by a high-order polynomial, the number of shape measurement points can be reduced, and the control calculation speed can be increased. Since the work roll corrects the shape of the plate end portion and the intermediate roll corrects the shape of the entire plate width, the shape correction ability such as composite elongation is excellent. Further, since only the bending amounts of the intermediate roll and the work roll are adjusted only by the shape data of the end portion and the central portion of the rolled material, the excellent effect that the control is simple and the control speed is fast is achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a shape control device for a multi-high rolling mill according to the present invention.

FIG. 2 is a front view of the rolling mill 10 shown in FIG.

FIG. 3 is a diagram showing a bending direction on the plus side of a rolling roll.

FIG. 4 is a diagram showing a bending direction on the negative side of a rolling roll.

5 is a diagram showing the relationship between the configuration of the deflector rolls 32 and 33 shown in FIG. 1 and the output values of the shape detectors 32b and 33b incorporated therein.

FIG. 6 is a flowchart showing a shape control procedure of an intermediate roll according to the present invention.

FIG. 7 is a flowchart showing a work roll shape control procedure according to the present invention.

8] Shape of rolled material and work roll bender (WRB)
6 is a graph showing the relationship between the correction direction of the intermediate roll bender (IMRB) and the correction direction.

[Explanation of symbols]

 10 multi-stage rolling mill 11,12 work roll 13,14 intermediate roll 15,16 auxiliary roll 21 work roll bender 22 intermediate roll bender 30 controller 32,33 deflector roll 32b, 33b shape detector

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B21B 37/00 BBH 8315-4E B21B 37/00 117 B

Claims (3)

[Claims] 1. A multi-stage rolling mill which uses a multi-stage rolling mill having a pair of upper and lower work rolls, an intermediate roll and a reinforcing roll, and which controls the shape of a rolled material by adjusting the bending amount of the intermediate roll and the work roll. In the shape control method,
The elongation in the longitudinal direction of the central portion and the end portion in the width direction of the rolled material is measured, and the intermediate roll is bent according to the difference in the elongation between the central portion and the end portion, and the width of the extension of the end portion. A shape control method for a multi-high rolling mill, comprising bending the work roll according to a rate of change in direction. 2. A multi-stage rolling mill having a pair of upper and lower work rolls, an intermediate roll and a reinforcing roll, and comprising a work roll bending device for bending the work roll and an intermediate roll bending device for bending the intermediate roll are used. Then, in the shape control device of the multi-stage rolling mill that controls the shape of the rolled material by adjusting the bending amount of the intermediate roll and the work roll, the elongation in the longitudinal direction of at least the central portion and the end portion in the width direction of the rolled material. Shape detecting means for measuring each, first driving means for driving the intermediate roll bending device by an operation amount according to a difference value of elongation between the central portion and the end portion measured by the shape detecting means, and the shape detecting means Drive the work roll bending device by an operation amount according to the rate of change in the elongation of the end measured in the width direction. A shape control device for a multi-high rolling mill. 3. The shape detecting means divides each of the center portion of the rolled material, the outermost portion of the end portion, and the adjacent inner portion adjacent to the outermost portion into a plurality of regions, and divides each into a plurality of regions. The elongation is measured in each of the areas, and the first driving means is configured to calculate the elongation from the average value of the elongation measured in each area of the central portion and the average value of the elongation measured in each area of the outermost portion. The difference value is obtained, and the second driving means obtains the rate of change from the average value of elongation measured in each region of the outermost portion and the average value of elongation measured in each region of the adjacent inner portion. The shape control device for a multi-high rolling mill according to claim 2, wherein