WO2011122070A1 - Rolling of metal strip - Google Patents

Rolling of metal strip Download PDF

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Publication number
WO2011122070A1
WO2011122070A1 PCT/JP2011/050785 JP2011050785W WO2011122070A1 WO 2011122070 A1 WO2011122070 A1 WO 2011122070A1 JP 2011050785 W JP2011050785 W JP 2011050785W WO 2011122070 A1 WO2011122070 A1 WO 2011122070A1
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WO
WIPO (PCT)
Prior art keywords
rolling
bending
force
roll
decrease
Prior art date
Application number
PCT/JP2011/050785
Other languages
French (fr)
Japanese (ja)
Inventor
小川 茂
比護 剛志
邦彦 若月
Original Assignee
新日本製鐵株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to CN2011800154894A priority Critical patent/CN102834192B/en
Priority to EP11762311.6A priority patent/EP2554284B1/en
Priority to BR112012024207A priority patent/BR112012024207A2/en
Priority to JP2011513800A priority patent/JP4763100B1/en
Priority to KR1020127024998A priority patent/KR101300237B1/en
Publication of WO2011122070A1 publication Critical patent/WO2011122070A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B29/00Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls ; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/38Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B13/00Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls

Definitions

  • the present invention relates to a rolling mill for metal sheet material, and relates to a rolling mill capable of imparting a high response and strong roll bending force.
  • the present invention relates to a method for rolling a metal sheet that can provide a highly responsive sheet crown and shape control function even in a multi-stage rolling mill in which the response of the decrease bending apparatus is lower than that of the increment bending apparatus.
  • Roll bending for imparting bending force to work roll chock and roll shift for displacing the roll in the roll axis direction as a control method when performing plate crown and shape control rolling in a multi-high rolling mill such as a 4-high rolling mill or a 6-high rolling mill
  • a roll cross that gives a cross angle to the roll.
  • Patent Document 1 describes a method of continuously rolling a rolled material obtained by joining steel materials having different sheet widths, sheet thicknesses, steel types, and the like using a hot finish rolling mill having a roll bending mechanism and a roll shift mechanism. Yes. However, since the change speed of the roll shift position is very slow compared to the change speed of the roll bending force, the roll shift position is fixed during rolling, and the crown control is performed only with the roll bending force with high responsiveness. is there.
  • Patent Document 2 describes that it is the secondary pipe length of the servo valve that determines the responsiveness of the roll bending apparatus (see paragraph [0014] of FIG. 1 and FIG. 1). For this reason, the bending force is controlled by a servo valve that controls the difference in hydraulic pressure between the increase side and the decrease side. In order to ensure high responsiveness, these servo valves are arranged on the side of the housing post at a total of four locations on the drive side and the operation side of the rolling mill housing, and from each servo valve to the hydraulic cylinder. The piping length is up to 2m.
  • the rolling mill shown in FIG. 1 is a four-high rolling mill provided with a pair of upper and lower work rolls 1-1 and 1-2 and a pair of upper and lower reinforcing rolls 2-1 and 2-2 for supporting them.
  • Increment bending devices 6-1 to 6-4 are incorporated into project blocks 5-1 and 5-2, and decrease bending devices 7-1 to 7-4 are incorporated into upper and lower reinforcing roll chocks 4-1 and 4-2.
  • This type of rolling mill In this type of rolling mill, the response speed of the decrease bending apparatus is delayed as compared with the response speed of the increment bending apparatus.
  • the reason why the response of the decrease bending apparatus does not increase is because the fixed pipe cannot be used. That is, since the work roll is more easily worn than the reinforcing roll by rolling operation, it is necessary to periodically change the roll. However, since the rolling mill shown in FIG. 1 incorporates the increment bending device into the project block, it is not necessary to attach or detach the hydraulic piping of the increment bending device every time the roll is changed. Can be connected. Thus, a servo valve for high response hydraulic control can be employed. On the other hand, since the decrease bending apparatus of the rolling mill shown in FIG. 1 is incorporated into the upper and lower reinforcing roll chock, the hydraulic piping of the decrease bending apparatus must be attached and detached each time the roll is changed.
  • the hydraulic control valve since there is a high possibility that minute foreign matters will be mixed in the hydraulic piping when the hydraulic piping is attached or detached, it is not possible to employ a servo valve for high response hydraulic control.
  • the hydraulic control valve since the hydraulic control valve must be connected via a flexible and detachable hydraulic piping such as a flexible piping, fluctuations in the hydraulic pressure to be transmitted may be absorbed and relaxed. That is, it can be connected to the hydraulic control valve via a fixed hydraulic pipe, or it must be connected to the hydraulic control valve via a flexible and detachable hydraulic pipe such as a flexible pipe. This is the biggest cause that the response of the decrease bending apparatus must be lower than the response of the increase bending apparatus.
  • the decrease bending device cannot be controlled with high response, rolling becomes unstable at the start of rolling, when the bending bending force is applied at the end of rolling, and when released, causing product quality to deteriorate and productivity to decrease. ing. That is, the decrease bending force cannot be applied during idling when no rolling load is applied. Therefore, it is necessary to quickly apply the decrease bending force at the start of rolling, while it is necessary to quickly return to the roll balance state at the end of rolling.
  • a predetermined defect bending force is not applied to the leading end of the rolled material, and the defective shape portion becomes long. .
  • the second finding is that when the decrease bending bending force is applied to the rolling mill of the type shown in FIG. 1, it is difficult to quickly change the setting during rolling. This is because disturbance factors that change during rolling, such as material temperature, could not be removed, and product quality and yield were reduced.
  • the problem to be solved by the present invention is that, in a rolling mill in which the response of the decrease bending apparatus is lower than the response of the increase bending apparatus, even when the decrease bending force is applied to the work roll, It is providing the rolling method of the metal plate material which can provide a shape control function.
  • the present inventor has found that the bending force due to the resultant force of both bending devices is a rolling mill in which the response of the decrease bending device is lower than the response of the increment bending device. It has been found that the control during rolling and rolling is performed only by the highly responsive increment bending apparatus, thereby enabling highly responsive sheet crown and shape control, and the present invention has been achieved. That is, when a decrease bending force is applied as a work roll bending force for the purpose of plate crown and shape control, a highly responsive incremental bending device is used to change the roll bending force at the start and end of rolling. Rolling method. This means that a highly responsive increase bending apparatus can compensate (cover) the responsiveness of the decrease bending apparatus. In addition, it is possible to build a good plate crown and shape by controlling with a highly responsive increment bending device against disturbances that change during rolling, such as the rolling material entry side plate thickness and rolling material temperature. Product quality and productivity can be significantly improved.
  • the rolling mill shown in FIG. 1 is a rolling mill having a structure in which a flexible and detachable hydraulic pipe is adopted as the hydraulic pipe of the decrease bending apparatus because of easy attachment / detachment of the pipe at the time of roll replacement.
  • the responsiveness of the decrease bending apparatus must be lower than the responsiveness of the increment bending apparatus.
  • this rolling mill has a structure in which an increase bending device is provided in the project block, a large capacity increase bending device can be provided in the project block, and the hydraulic pressure can be obtained through a fixed hydraulic pipe. Since it can be connected to a control valve, it has an excellent characteristic that it can be an ink-bending device with high responsiveness. Therefore, the roll bending force control with high responsiveness can be performed.
  • the present inventor is able to provide a metal crown that can provide a highly responsive plate crown and shape control function even in a rolling mill in which the response of the decrease bending apparatus is lower than that of the increment bending apparatus.
  • Invented a method of rolling plate materials. The gist is as follows.
  • the response of the decrease bending apparatus is higher than that of the increase bending apparatus.
  • a method of rolling a metal sheet using a low rolling mill Before starting rolling, both the increase bending force and the decrease bending force are applied, and a roll bending force corresponding to the roll balance force is applied to the work roll chock as a resultant force. After that, while changing the decrease bending force so as to become the decrease bending force during the predetermined rolling, the increase bending force is changed so that the resultant balance of the decrease bending force and the increase bending force maintains the roll balance force.
  • the increase bending force is applied to the work roll chock so that the decrease bending force is initially set as the decrease bending force during rolling, and the resultant balance of the decrease bending force and the increase bending force becomes the roll balance force. If you let it, you can omit it. After that, at the start of rolling, the increase bending force is changed to the work roll chock as a resultant force while changing the increase bending force while continuing the control of maintaining the decrease bending force during the predetermined rolling. Make it work.
  • the rolling is performed so as to maintain the work roll bending force during the predetermined rolling, Thereafter, at the end of rolling, the increment bending force is changed, and the roll bending force corresponding to the roll balance force is applied to the work roll chock as a resultant force with the decrease bending force, and the rolling of the metal plate material is finished in this state. Thereafter, the decrease bending force and the increase bending force are decreased so as to maintain the roll balance force as the resultant force.
  • This step also maintains the decrease bending force during the specified rolling, and the increase bending force is set so that the resultant balance of the decrease bending force and the increase bending force becomes the roll balance force. Can be omitted if it works.
  • the rolling mill includes at least a pair of upper and lower work rolls and a pair of upper and lower reinforcing rolls that respectively support the upper and lower work rolls, and an increase hydraulic cylinder constituting the increase bending apparatus for each of the upper and lower work rolls is fixed. Connected to each hydraulic control valve via a hydraulic pipe, and incorporated into a project block projecting inside the rolling mill housing, Further, the decrease hydraulic cylinder constituting the decrease bending apparatus for at least the upper work roll is connected to the hydraulic control valve via a flexible and detachable hydraulic pipe and has a structure incorporated into the upper reinforcing roll chock. It is a rolling machine, Comprising: The rolling method of the metal plate material as described in (1) characterized by performing using the said rolling mill.
  • the predetermined value of the roll bending force is a roll bending force value obtained in advance from rolling conditions and the like.
  • the roll bending force acting on the work roll chock is a resultant force of the increment bending force and the decrease bending force.
  • the roll bending force at the start of rolling and at the end of rolling is changed using an increase bending responsive apparatus.
  • the response of the decrease bending device can be improved.
  • the high-responding increment bending device can compensate for the responsiveness of the decrease bending device, thereby providing a highly responsive and powerful plate crown and shape control function. it can. Therefore, according to the rolling method of the present invention, it is possible to build a good plate crown and shape against disturbances that change during rolling, such as the rolled material entry side plate thickness and the rolled material temperature, and the product quality And the yield can be greatly improved.
  • FIG. 1 is a side view showing an example of the structure of a rolling mill targeted by the present invention, and this rolling mill will be described as an example.
  • the rolling mill targeted by the present invention includes a pair of upper and lower work rolls 1-1 and 1-2 and a pair of upper and lower reinforcing rolls 2-1 and 2-2 for supporting them. It is a multi-stage rolling mill.
  • the rolling mill shown in the figure is a four-high rolling mill of the type adopted for a finishing tandem rolling mill of a thin steel plate strip or the like, it is not limited to this and may be a six-high rolling mill.
  • the upper increment bending devices 6-1 and 6-2 that apply an increase bending force to the upper work roll 1-1, and the lower operation load that applies an increase bending force to the lower work roll 1-2.
  • Increment bending apparatuses 6-3 and 6-4 are incorporated in project blocks 5-1 and 5-2 protruding inside the housing 9. For this reason, the work rolls 1-1 and 1-2 require periodic roll reassignment due to wear and tear due to rolling operation.
  • the rolling mill of FIG. 1 does not need to attach or detach the hydraulic piping of the increment bending apparatus every time the roll is reassigned.
  • Each of the increment bending apparatuses 6-1 to 6-4 can be connected to each hydraulic control valve via a fixed hydraulic pipe, thereby adopting a servo valve for high response hydraulic control. be able to. Therefore, it is possible to provide an incremental bending apparatus with high responsiveness.
  • the upper decrease bending apparatuses 7-1 and 7-2 for applying a decrease bending force to the upper work roll 1-1 are incorporated in the upper reinforcing roll chock 4-1, and the decrease bending bending force is applied to the lower work roll 1-2.
  • the lower decrease bending apparatuses 7-3 and 7-4 that load the lower reinforcement roll chock 4-2 are incorporated.
  • the reinforcing rolls 2-1 and 2-2 are also worn out by the rolling operation although not as much as the work rolls, and therefore it is necessary to periodically change the roll.
  • the decrease bending device is The responsiveness is lower than the responsiveness of the increment bending apparatus. For this reason, when a decrease bending force is applied as a work roll bending force for the purpose of plate crown and shape control, it is difficult to quickly change the setting during rolling. For this reason, appropriate roll bending control cannot be performed with respect to disturbance factors that change during rolling, such as the rolled material entry side plate thickness and the rolled material temperature, and the product quality and yield may be reduced.
  • the decrease bending force cannot be applied during idling when no rolling load is applied.
  • it is necessary to quickly switch from the roll balance state at the time of idling to the decrease bending force at the start of rolling and to quickly return to the roll balance state at the end of rolling. Therefore, if the roll bending force is changed under the control of the decrease bending device having poor responsiveness, a predetermined defect bending force may not be applied to the leading end of the rolled material, and the shape defect portion may become long. .
  • the responsiveness of the roll bending apparatus is determined by the secondary pipe length of the servo valve.
  • the pipe length from each servo valve to the hydraulic cylinder is shortened to within 2m, and the difference between the oil pressure on the lease side and the oil pressure on the decrease side is controlled via the servo valve, resulting in high responsiveness of bending force.
  • it is impractical to use fixed hydraulic piping on both the lease side and the decrease side because the work rolls and the reinforcement rolls must be reassembled regularly. For this reason, it is not possible to sufficiently increase the responsiveness when the decrease bending, which is the subject of the present invention, is applied.
  • the rolling method according to the present invention also solves the problem in Patent Document 2.
  • the increment bending apparatus means a hydraulic apparatus that applies a force in the direction of increasing the roll opening degree to the work roll chock.
  • the increment bending apparatus is a general term for apparatuses including a hydraulic cylinder as an actuator.
  • the increment bending apparatus refers to a hydraulic cylinder that is an actuator thereof unless otherwise specified.
  • a force applied to the work roll by the increase bending apparatus is referred to as an increase bending force.
  • a hydraulic device that applies a force in the direction of decreasing the roll opening degree to the work roll chock is referred to as a decrease bending device, and a force applied to the work roll by this is referred to as a decrease bending force.
  • the decrease bending apparatus is a general term for apparatuses including a hydraulic cylinder as an actuator.
  • the decrease bending apparatus refers to a hydraulic cylinder that is an actuator thereof unless otherwise specified.
  • FIG. 2 is a diagram showing an example of the operation flow of the rolling method according to the present invention. More specifically, FIG. 2 shows the operation of an increase bending device having a high responsiveness and a slightly bending responsive bending device. It is a figure which shows a flow.
  • FIG. 3 shows time-series changes in roll bending force and the like accompanying a rolling operation for a single rolled material when this rolling method is followed.
  • FIG. 3 shows time-series changes in the rolling load, the output of the increment bending apparatus, the output of the decrease bending apparatus, and the work roll bending force as a resultant force from the top.
  • FIGS work roll bending force
  • the roll bending force is the increase bending force (the force in the increase direction (the direction in which the roll is opened)), and the decrease bending force (the force in the decrease direction (the direction in which the roll is pressed)). Is defined as a negative value.
  • both the increase bending force and the decrease bending force are applied, and the roll bending force on the increase side corresponding to the roll balance force (F B ) is applied to the work roll chock as a resultant force. That is, at idle before rolling, the increment bending device output is I B (> 0), the decrease bending device output is D B ( ⁇ 0), and I B + D B is the roll balance force F B (> 0).
  • the increment bending device output is I B (> 0)
  • the decrease bending device output is D B ( ⁇ 0)
  • I B + D B is the roll balance force F B (> 0).
  • the roll balancing force F B is rolls as a work roll and a driven which are driven by an electric motor in mill deceleration idling state is determined as a force that does not slip, also D B working actuator of decrease-bending device What is necessary is just to set it with the minimum oil pressure that does not leave the roll chock.
  • the increase bending force is decreased while continuing the control to keep the constant bending force constant, so that the roll bending force on the predetermined decrease side acts on the work roll chock as a resultant force.
  • Rolling That is, in the rolling start timing (b point on the time axis), is changed to I R ink bending device output from the I S.
  • the control of the quick-bending apparatus responsive remains of such slow decrease-bending device output response by the D S, the decrease-the work roll bending force of the resultant force from the roll balancing force F B (> 0) can be quickly switched to-bending force F R ( ⁇ 0).
  • the rolling start time (b) refers to the time point when the rolling is started, and the detection thereof is, for example, the load detected by the load cell for measuring the rolling load of the rolling mill is the rolling load predicted and calculated in the setting calculation. For example, it may be determined by a method in which the timing exceeds 30%. This value is preferably set between 10 and 30%. This is because it can be distinguished from fluctuations in roll balance force, and the start of rolling can be detected quickly.
  • the roll bending force is returned to the state before starting rolling, and the roll bending force on the increase side corresponding to the roll balance force is applied to the work roll chock as a resultant force, and the rolling of the metal plate material is finished in this state.
  • decrease-bending device output returns the fast-bending device output response remains D S from I R to I S.
  • the work roll bending force as a resultant force can be quickly switched from the decrease bending force F R ( ⁇ 0) to the roll balance force F B (> 0).
  • the rolling end timing (point c on the time axis) refers to the end of rolling.
  • the detection may be determined by a method in which the load detected by the load cell for measuring the rolling load of the rolling mill is set to a timing when the actual rolling load during rolling is less than 50% of a value obtained by time-series averaging, for example.
  • This value can be set arbitrarily, but is preferably set between 50 and 80%. This is because it can be distinguished from fluctuations in roll bending force during rolling, and the end of rolling can be detected quickly.
  • a rolled end timing for example, the time of the lapse of one to three seconds and work completion timing d, at this timing, the increase-bending device output I B, the decrease-bending device output and D B.
  • This change work roll bending force of the resultant force is substantially maintained in the roll balancing force F B.
  • the roll bending force is changed at the start of rolling and at the end of rolling using a highly responsive increment bending apparatus provided in the project block. For this reason, even if it is unavoidable to deploy a decrease bending device that is less responsive than an increase bending device, a highly responsive increase bending device compensates for this. In addition, a powerful plate crown / shape control function can be provided. Furthermore, even when the rolling force changes due to various factors (disturbances) during rolling, it is possible to quickly control to maintain the optimal work roll bending force with a highly responsive incremental bending device. It is. That is, according to the rolling method of the present invention, it is possible to build a good plate crown and shape against disturbances that change during rolling, such as the rolled material entry side plate thickness and the rolled material temperature, and the product quality And the yield can be greatly improved.
  • FIG. 4 is a diagram showing time-series changes in roll bending force and the like when the response of the decrease bending apparatus is low (especially when the reaction force is reduced and the pressure drops when the reaction force is released). Similar to FIG. 3, a time-series change in roll bending force and the like accompanying a rolling operation on a single rolled material when the operation flow of the increment bending apparatus and the decrease bending apparatus shown in FIG. 2 is followed is shown. . That is, an example in which the response speed of the decrease bending apparatus is slower than in the case of FIGS.
  • FIG. 5 is a diagram showing another example of the operation flow of the rolling method according to the present invention, in which the operation of the incremental bending apparatus with high responsiveness and the decrease bending apparatus with low responsiveness compared to the case of FIGS. It is a figure which shows a flow.
  • the increment bending apparatus based on the decrease bending force obtained by measuring the hydraulic pressure in the hydraulic pipe connected to the decrease bending apparatus or the decrease bending force measured by the load cell installed in the apparatus. To control.
  • the output of the increase-bending device decrease-bending force or decrease- Control according to the hydraulic pressure of the leasing bending machine.
  • the other control is the same as the rolling method shown in FIG.
  • the increase bending device compensates for the fluctuation of the output of the decrease bending device, and the work roll bending force is realized with high response control. be able to.
  • FIG. 7 and 8 are side views showing another example of the structure of the rolling mill targeted by the present invention.
  • These rolling mills can receive the rolling direction force applied to the body of the upper work roll 1-1 not by the project blocks 5-1 and 5-2 but by the housing window 12 so that the roll opening degree can be increased. It is an improvement.
  • the rolling mill shown in FIG. 7 is a rolling mill in which lower decrease bending apparatuses 7-3 and 7-4 for applying a decrease bending force to the lower work roll 1-2 are arranged in the lower reinforcing roll chock 4-2.
  • the rolling mill shown in FIG. 8 is a rolling machine in which the lower decrease bending apparatuses 7-3 and 7-4 are arranged in dedicated project blocks 5-3 and 5-4 located below the project blocks 5-1 and 5-2. Machine.
  • the rolling method according to the present invention can also be applied to these rolling mills, and this makes it possible to produce a good plate crown and shape against disturbances that change during rolling, such as the thickness of the rolled material entry side and the temperature of the rolled material. Product quality and yield can be greatly improved.
  • the present invention can be used for rolling a steel sheet, particularly a reverse rolling mill that requires a large opening.

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

Disclosed is a method for rolling in a rolling mill which has a bending decreasing device with a responsivity lower than that of a bending increasing device, the method intended for realizing a quick-response strip crown and shape control function even under a setting condition in which roll bending decreasing force is applied. To solve the aforementioned challenge, the method is executed as follows. Before starting rolling, both bending increasing force and bending decreasing force are applied to allow the resultant force, or roll bending force equivalent to roll balance force, to act upon a work roll chock. At the start of rolling, the bending increasing force is varied with the bending decreasing force kept at a constant value, allowing the resultant force or predetermined roll bending force (bending decreasing force) to act on the work roll chock for rolling. At the end of the rolling, the bending increasing force is reset to the pre-rolling value, and as the resultant force with the bending decreasing force, the roll bending force equivalent to the roll balance force is exerted on the work roll chock, allowing the rolling to end under this condition.

Description

金属板材の圧延方法Metal plate rolling method
 本発明は、金属板材の圧延機であって、高応答性で強力なロールベンディング力を付与できる圧延機に関する。特に、ディクリースベンディング装置の応答性がインクリースベンディング装置の応答性よりも低い多段圧延機であっても、高応答な板クラウン・形状制御機能を付与できる金属板材の圧延方法に関する。 The present invention relates to a rolling mill for metal sheet material, and relates to a rolling mill capable of imparting a high response and strong roll bending force. In particular, the present invention relates to a method for rolling a metal sheet that can provide a highly responsive sheet crown and shape control function even in a multi-stage rolling mill in which the response of the decrease bending apparatus is lower than that of the increment bending apparatus.
 4段圧延機もしくは6段圧延機などの多段圧延機において板クラウン・形状制御圧延を行う際の制御方法とし、作業ロールチョックにベンディング力を付与するロールベンディング、ロールをロール軸方向に変位させるロールシフト、ロールにクロス角を与えるロールクロスなどがある。 Roll bending for imparting bending force to work roll chock and roll shift for displacing the roll in the roll axis direction as a control method when performing plate crown and shape control rolling in a multi-high rolling mill such as a 4-high rolling mill or a 6-high rolling mill There is a roll cross that gives a cross angle to the roll.
 これらの制御方法のうち、ロールシフトやロールクロスは、圧延中に迅速に設定変更することが困難である。このため、圧延中の制御が要求される板クラウン・形状制御圧延には適していない。これに対し、ロールベンディング装置は油圧を制御し、圧延中にロールベンディング力を変更できるので、板クラウン・形状制御圧延には適している。
 特許文献1には、板幅、板厚、鋼種等が異なる鋼材を接合した圧延材をロールベンディング機構とロールシフト機構を有する熱間仕上げ圧延機を用いて連続して圧延する方法が記載されている。しかし、ロールベンディング力の変更速度と比較してロールシフト位置の変更速度が非常に遅いため、圧延中はロールシフト位置を固定して、応答性の高いロールベンディング力のみでクラウン制御を行うものである。
Among these control methods, it is difficult to quickly change the setting of roll shift and roll cloth during rolling. For this reason, it is not suitable for sheet crown / shape control rolling that requires control during rolling. On the other hand, the roll bending apparatus controls the hydraulic pressure and can change the roll bending force during rolling, and is therefore suitable for plate crown / shape controlled rolling.
Patent Document 1 describes a method of continuously rolling a rolled material obtained by joining steel materials having different sheet widths, sheet thicknesses, steel types, and the like using a hot finish rolling mill having a roll bending mechanism and a roll shift mechanism. Yes. However, since the change speed of the roll shift position is very slow compared to the change speed of the roll bending force, the roll shift position is fixed during rolling, and the crown control is performed only with the roll bending force with high responsiveness. is there.
 この場合、板クラウン・形状制御はロールベンディング装置の制御速度によって律速されており、従来からロールベンディング装置には高い応答性が望まれている。
 特許文献2には、ロールベンディング装置の応答性を決定するのはサーボ弁の二次配管長さであることが記載されている(特許文献2の段落[0014]、図1を参照)。このため、ベンディング力の制御をインクリース側とディクリース側の油圧の差を制御するサーボ弁で実施するものである。高い応答性を確保するために、これらのサーボ弁を圧延機ハウジングの駆動側と操作側の各入側及び出側の計4ケ所のハウジングポストの側面に配設し、各サーボ弁から油圧シリンダーまでの配管長さを2m以内にしている。
In this case, the plate crown / shape control is controlled by the control speed of the roll bending apparatus, and conventionally, high response is desired for the roll bending apparatus.
Patent Document 2 describes that it is the secondary pipe length of the servo valve that determines the responsiveness of the roll bending apparatus (see paragraph [0014] of FIG. 1 and FIG. 1). For this reason, the bending force is controlled by a servo valve that controls the difference in hydraulic pressure between the increase side and the decrease side. In order to ensure high responsiveness, these servo valves are arranged on the side of the housing post at a total of four locations on the drive side and the operation side of the rolling mill housing, and from each servo valve to the hydraulic cylinder. The piping length is up to 2m.
特開平6−55207号公報JP-A-6-55207 特開平8−215730号公報JP-A-8-215730
 しかしながら、ロールベンディング装置の応答性を決定付けるのは、サーボ弁から油圧シリンダーまでの配管長さだけではない。
 例えば、図1に示す圧延機では、上下一対の作業ロール1−1、1−2とこれらをそれぞれ支持する上下一対の補強ロール2−1、2−2を備える4段圧延機である。インクリースベンディング装置6−1~6−4がプロジェクトブロック5−1、5−2に組み込まれ、ディクリースベンディング装置7−1~7−4が上下補強ロールチョック4−1、4−2に組み込まれた形式の圧延機である。この形式の圧延機では、インクリースベンディング装置の応答速度に比べディクリースベンディング装置の応答速度が遅れる。
 そのため、板クラウン・形状制御のために作業ロールにインクリースベンディング力を作用させる場合には、高応答な制御が可能であるが、ディクリースベンディング力を作用させる場合には、圧延中に迅速に設定変更することができない。したがって、圧延材入側板厚や圧延材温度等の圧延中に変動する外乱因子を取り除くことができず、製品品質や歩留まりを低下させる場合があった。
However, it is not only the pipe length from the servo valve to the hydraulic cylinder that determines the responsiveness of the roll bending apparatus.
For example, the rolling mill shown in FIG. 1 is a four-high rolling mill provided with a pair of upper and lower work rolls 1-1 and 1-2 and a pair of upper and lower reinforcing rolls 2-1 and 2-2 for supporting them. Increment bending devices 6-1 to 6-4 are incorporated into project blocks 5-1 and 5-2, and decrease bending devices 7-1 to 7-4 are incorporated into upper and lower reinforcing roll chocks 4-1 and 4-2. This type of rolling mill. In this type of rolling mill, the response speed of the decrease bending apparatus is delayed as compared with the response speed of the increment bending apparatus.
Therefore, when the increase bending force is applied to the work roll for the plate crown and shape control, it is possible to control with high response.However, when the decrease bending force is applied, it can be quickly performed during rolling. The setting cannot be changed. Therefore, disturbance factors that change during rolling, such as the rolling material entry side plate thickness and the rolling material temperature, cannot be removed, and the product quality and the yield may be reduced.
 また、ディクリースベンディング装置の応答性が高くならないのは、固定配管を使用できないからでもある。すなわち、作業ロールは圧延操業によって補強ロールより損耗しやすいために定期的なロール組み替えが必要である。しかし、図1に示す圧延機は、インクリースベンディング装置をプロジェクトブロックに組み込むため、ロール組み替え作業の度にインクリースベンディング装置の油圧配管を着脱する必要がなく、固定配管を介して油圧制御弁に接続することができる。これにより高応答油圧制御のためのサーボバルブを採用することができる。これに対して、図1の圧延機のディクリースベンディング装置は、上下補強ロールチョックに組み込むため、ロール組み替え作業の度にディクリースベンディング装置の油圧配管を着脱しなければならない。油圧配管の着脱時に油圧配管内に微小な異物が混入する可能性が高くなるため、高応答油圧制御のためのサーボバルブを採用することができない。また、フレキシブル配管等の柔構造かつ着脱自在な油圧配管を介して油圧制御弁に接続しなければならないので、伝達すべき油圧の変動が吸収緩和されてしまうことがあった。
 すなわち、固定配管された油圧配管を介して油圧制御弁に接続することができるか、フレキシブル配管等の柔構造かつ着脱自在な油圧配管を介して油圧制御弁に接続しなければならないかということが、ディクリースベンディング装置の応答性がインクリースベンディング装置の応答性よりも低くならざるを得ない最大の原因である。
Moreover, the reason why the response of the decrease bending apparatus does not increase is because the fixed pipe cannot be used. That is, since the work roll is more easily worn than the reinforcing roll by rolling operation, it is necessary to periodically change the roll. However, since the rolling mill shown in FIG. 1 incorporates the increment bending device into the project block, it is not necessary to attach or detach the hydraulic piping of the increment bending device every time the roll is changed. Can be connected. Thus, a servo valve for high response hydraulic control can be employed. On the other hand, since the decrease bending apparatus of the rolling mill shown in FIG. 1 is incorporated into the upper and lower reinforcing roll chock, the hydraulic piping of the decrease bending apparatus must be attached and detached each time the roll is changed. Since there is a high possibility that minute foreign matters will be mixed in the hydraulic piping when the hydraulic piping is attached or detached, it is not possible to employ a servo valve for high response hydraulic control. In addition, since the hydraulic control valve must be connected via a flexible and detachable hydraulic piping such as a flexible piping, fluctuations in the hydraulic pressure to be transmitted may be absorbed and relaxed.
That is, it can be connected to the hydraulic control valve via a fixed hydraulic pipe, or it must be connected to the hydraulic control valve via a flexible and detachable hydraulic pipe such as a flexible pipe. This is the biggest cause that the response of the decrease bending apparatus must be lower than the response of the increase bending apparatus.
 また、ディクリースベンディング装置が高応答に制御できないため、圧延開始時、圧延終了時のディクリールベンディング力負荷時、解除時に圧延が不安定となり、製品品質が悪化し、生産性低下の原因となっている。
 すなわちディクリースベンディング力は圧延荷重が負荷されていないアイドル時に負荷することができない。そのため、圧延開始時に迅速にディクリースベンディング力を負荷する必要があり、一方で圧延終了時に迅速にロールバランス状態に戻す必要がある。ここで、ロールベンディング力の変更を応答性に劣るディクリースベンディング装置の制御で実施した場合には、圧延材の先尾端において所定のディクリースベンディング力が負荷されずに形状不良部が長くなる。
 すなわち、第2の知見は、図1に示す形式の圧延機においてディクリースベンディング力を作用させる場合には、圧延中に迅速に設定変更することが困難であるため、圧延材入側板厚や圧延材温度等の圧延中に変動する外乱因子を取り除くことができず、製品品質や歩留まりを低下させたことである。
Also, since the decrease bending device cannot be controlled with high response, rolling becomes unstable at the start of rolling, when the bending bending force is applied at the end of rolling, and when released, causing product quality to deteriorate and productivity to decrease. ing.
That is, the decrease bending force cannot be applied during idling when no rolling load is applied. Therefore, it is necessary to quickly apply the decrease bending force at the start of rolling, while it is necessary to quickly return to the roll balance state at the end of rolling. Here, when the roll bending force is changed under the control of a decrease bending device having poor responsiveness, a predetermined defect bending force is not applied to the leading end of the rolled material, and the defective shape portion becomes long. .
That is, the second finding is that when the decrease bending bending force is applied to the rolling mill of the type shown in FIG. 1, it is difficult to quickly change the setting during rolling. This is because disturbance factors that change during rolling, such as material temperature, could not be removed, and product quality and yield were reduced.
 本発明の解決すべき課題は、ディクリースベンディング装置の応答性がインクリースベンディング装置の応答性より低い圧延機において、作業ロールにディクリースベンディング力を作用させる場合にも、高応答な板クラウン・形状制御機能を付与できる金属板材の圧延方法を提供することである。 The problem to be solved by the present invention is that, in a rolling mill in which the response of the decrease bending apparatus is lower than the response of the increase bending apparatus, even when the decrease bending force is applied to the work roll, It is providing the rolling method of the metal plate material which can provide a shape control function.
 本発明者は、前記課題を解決すべく、鋭意検討を重ねた結果、ディクリースベンディング装置の応答性がインクリースベンディング装置の応答性よりも低い圧延機において、両ベンディング装置の合力によるベンディング力を設定し、圧延中の制御は、応答性の高いインクリースベンディング装置のみで行うことにより、高応答な板クラウン・形状制御が可能となることを知見し、本発明を成すに至った。
 すなわち、板クラウン・形状制御の目的で作業ロールベンディング力としてディクリースベンディング力を作用させる場合に、圧延開始時および圧延終了時のロールベンディング力の変更を、応答性の高いインクリースベンディング装置を用いて行うという圧延方法である。高応答なインクリースベンディング装置がディクリースベンディング装置の応答性を補償(カバー)することができるということである。
 さらに、これにより圧延材入側板厚や圧延材温度等の圧延中に変動する外乱に対しても、高応答なインクリースベンディング装置で制御することにより、良好な板クラウン・形状を造り込むことが可能となり、製品品質および生産性を著しく改善できるものである。
As a result of intensive studies to solve the above problems, the present inventor has found that the bending force due to the resultant force of both bending devices is a rolling mill in which the response of the decrease bending device is lower than the response of the increment bending device. It has been found that the control during rolling and rolling is performed only by the highly responsive increment bending apparatus, thereby enabling highly responsive sheet crown and shape control, and the present invention has been achieved.
That is, when a decrease bending force is applied as a work roll bending force for the purpose of plate crown and shape control, a highly responsive incremental bending device is used to change the roll bending force at the start and end of rolling. Rolling method. This means that a highly responsive increase bending apparatus can compensate (cover) the responsiveness of the decrease bending apparatus.
In addition, it is possible to build a good plate crown and shape by controlling with a highly responsive increment bending device against disturbances that change during rolling, such as the rolling material entry side plate thickness and rolling material temperature. Product quality and productivity can be significantly improved.
 例えば図1に示す圧延機は、ロール交換時における配管着脱の容易性からディクリースベンディング装置の油圧配管に柔構造かつ着脱自在な油圧配管を採用する構造の圧延機である。その結果としてディクリースベンディング装置の応答性がインクリースベンディング装置の応答性よりも低くならざるを得ない特性を有する圧延機ではある。しかし、この圧延機は、プロジェクトブロックにインクリースベンディング装置を配備する構造であるため、プロジェクトブロックに大容量のインクリースベンディング装置を配備することができ、しかも固定配管された油圧配管を介して油圧制御弁に接続することができるので応答性の高いインクリースベンディング装置とすることができるという優れた特性を併せ持つ。そのため、上記応答性の高いロールベンディング力制御が可能となるのである。 For example, the rolling mill shown in FIG. 1 is a rolling mill having a structure in which a flexible and detachable hydraulic pipe is adopted as the hydraulic pipe of the decrease bending apparatus because of easy attachment / detachment of the pipe at the time of roll replacement. As a result, the responsiveness of the decrease bending apparatus must be lower than the responsiveness of the increment bending apparatus. However, since this rolling mill has a structure in which an increase bending device is provided in the project block, a large capacity increase bending device can be provided in the project block, and the hydraulic pressure can be obtained through a fixed hydraulic pipe. Since it can be connected to a control valve, it has an excellent characteristic that it can be an ink-bending device with high responsiveness. Therefore, the roll bending force control with high responsiveness can be performed.
 これら上記の知見に基づき、本発明者は、ディクリースベンディング装置の応答性がインクリースベンディング装置の応答性よりも低い圧延機であっても、高応答な板クラウン・形状制御機能を付与できる金属板材の圧延方法の発明を成した。その要旨とするところは以下のとおりである。 Based on these findings, the present inventor is able to provide a metal crown that can provide a highly responsive plate crown and shape control function even in a rolling mill in which the response of the decrease bending apparatus is lower than that of the increment bending apparatus. Invented a method of rolling plate materials. The gist is as follows.
 (1)インクリースベンディング力を発生するインクリースベンディング装置と、ディクリースベンディング力を発生するディクリースベンディング装置を有する圧延機において、前記インクリースベンディング装置に比べて前記ディクリースベンディング装置の応答性が低い圧延機を用いて行う金属板材の圧延方法であって、
 圧延開始前に、インクリースベンディング力とディクリースベンディング力の双方を作用させ、合力としてロールバランス力に相当するロールベンディング力を作業ロールチョックに作用させる。
 その後、所定の圧延中ディクリースベンディング力になるようにディクリースベンリング力を変化させつつ、ディクリースベンディング力とインクリースベンディング力の合力がロールバランス力を維持するようにインクリースベンディング力を変化させる。このステップは、最初からディクリースベンリング力を所定の圧延中ディクリースベンディング力とし、ディクリースベンディング力とインクリースベンディング力の合力がロールバランス力となるようにインクリースベンディング力を作業ロールチョックに作用させておけば、省略することができる。
 その後、圧延開始時に、ディクリースベンディング力を前記所定の圧延中ディクリースベンディング力を保持する制御を継続しつつインクリースベンディング力を変化させ、合力として所定の圧延中作業ロールベンディング力が作業ロールチョックに作用する状態にする。
 圧延中は、インクリースベンディング力を制御することにより、前記所定の圧延中作業ロールベンディング力を維持するように圧延を行い、
 その後、圧延終了時に、インクリースベンディング力を変化させ、ディクリースベンディング力との合力として、ロールバランス力に相当するロールベンディング力を作業ロールチョックに作用させ、この状態で金属板材の圧延を終了する。
 その後、前記合力としてのロールバランス力を維持するように、ディクリースベンディング力とインクリースベンディング力を減少させる。このステップも、ディクリースベンリング力を所定の圧延中ディクリースベンディング力を維持するようにし、ディクリースベンディング力とインクリースベンディング力の合力がロールバランス力となるようにインクリースベンディング力を作業ロールチョックに作用するのであれば、省略することができる。
 以上のことを特徴とする金属板材の圧延方法である。
(2)前記圧延機が、一対の上下作業ロールとこれらをそれぞれ支持する一対の上下補強ロールを少なくとも備え、上下作業ロールのそれぞれに対する前記インクリースベンディング装置を構成するインクリース油圧シリンダーを、固定された油圧配管を介してそれぞれの油圧制御弁に接続するとともに圧延機ハウジングの内側に突出したプロジェクトブロックに組み込む構造を有し、
 さらに、少なくとも上作業ロールに対する前記ディクリースベンディング装置を構成するディクリース油圧シリンダーは、柔構造かつ着脱自在な油圧配管を介して油圧制御弁に接続されるとともに、上補強ロールチョックに組み込まれる構造を有する圧延機であって、当該圧延機を用いて行うことを特徴とする(1)に記載の金属板材の圧延方法。
(1) In a rolling mill having an increment bending apparatus that generates an increase bending force and a decrease bending apparatus that generates a decrease bending force, the response of the decrease bending apparatus is higher than that of the increase bending apparatus. A method of rolling a metal sheet using a low rolling mill,
Before starting rolling, both the increase bending force and the decrease bending force are applied, and a roll bending force corresponding to the roll balance force is applied to the work roll chock as a resultant force.
After that, while changing the decrease bending force so as to become the decrease bending force during the predetermined rolling, the increase bending force is changed so that the resultant balance of the decrease bending force and the increase bending force maintains the roll balance force. Let In this step, the increase bending force is applied to the work roll chock so that the decrease bending force is initially set as the decrease bending force during rolling, and the resultant balance of the decrease bending force and the increase bending force becomes the roll balance force. If you let it, you can omit it.
After that, at the start of rolling, the increase bending force is changed to the work roll chock as a resultant force while changing the increase bending force while continuing the control of maintaining the decrease bending force during the predetermined rolling. Make it work.
During rolling, by controlling the increment bending force, the rolling is performed so as to maintain the work roll bending force during the predetermined rolling,
Thereafter, at the end of rolling, the increment bending force is changed, and the roll bending force corresponding to the roll balance force is applied to the work roll chock as a resultant force with the decrease bending force, and the rolling of the metal plate material is finished in this state.
Thereafter, the decrease bending force and the increase bending force are decreased so as to maintain the roll balance force as the resultant force. This step also maintains the decrease bending force during the specified rolling, and the increase bending force is set so that the resultant balance of the decrease bending force and the increase bending force becomes the roll balance force. Can be omitted if it works.
It is the rolling method of the metal plate material characterized by the above.
(2) The rolling mill includes at least a pair of upper and lower work rolls and a pair of upper and lower reinforcing rolls that respectively support the upper and lower work rolls, and an increase hydraulic cylinder constituting the increase bending apparatus for each of the upper and lower work rolls is fixed. Connected to each hydraulic control valve via a hydraulic pipe, and incorporated into a project block projecting inside the rolling mill housing,
Further, the decrease hydraulic cylinder constituting the decrease bending apparatus for at least the upper work roll is connected to the hydraulic control valve via a flexible and detachable hydraulic pipe and has a structure incorporated into the upper reinforcing roll chock. It is a rolling machine, Comprising: The rolling method of the metal plate material as described in (1) characterized by performing using the said rolling mill.
(3)前記ディクリース油圧シリンダー内あるいは該シリンダーにつながる油圧配管内の油圧を測定し、その測定値に基づき、作業ロールチョックに作用するロールベンディング力が所定の値になるようにインクリースベンディング力を制御することを特徴とする前記(2)に記載の金属板材の圧延方法。
 ここでロールベンディング力の所定の値とは、圧延条件等から予め求めたロールベンディング力値である。また、作業ロールチョックに作用するロールベンディング力は、インクリースベンディング力とディクリースベンディング力との合力となる。
(3) Measure the hydraulic pressure in the decrease hydraulic cylinder or in the hydraulic piping connected to the cylinder, and based on the measured value, increase the bending bending force so that the roll bending force acting on the work roll chock becomes a predetermined value. The method for rolling a metal sheet according to (2), wherein the method is controlled.
Here, the predetermined value of the roll bending force is a roll bending force value obtained in advance from rolling conditions and the like. Further, the roll bending force acting on the work roll chock is a resultant force of the increment bending force and the decrease bending force.
 本発明に係る圧延方法は、圧延開始時および圧延終了時のロールベンディング力の変更を、応答性の高いインクリースベンディング装置を用いて行う。
 このために、ロール交換時における配管着脱の容易性からディクリースベンディング装置の油圧配管に、柔構造かつ着脱自在な油圧配管を採用することによって、ディクリースベンディング装置の応答性がインクリースベンディング装置の応答性よりも低い圧延機であっても、高応答なインクリースベンディング装置がディクリースベンディング装置の応答性を補償して、これにより高応答かつ強力な板クラウン・形状制御機能を付与することができる。
 したがって、本発明に係る圧延方法によれば、圧延材入側板厚や圧延材温度等の圧延中に変動する外乱に対しても良好な板クラウン・形状を造り込むことが可能であり、製品品質および歩留を大きく改善することができる。
In the rolling method according to the present invention, the roll bending force at the start of rolling and at the end of rolling is changed using an increase bending responsive apparatus.
For this reason, by adopting a flexible and detachable hydraulic piping for the hydraulic piping of the decrease bending device due to the ease of piping attachment and detachment at the time of roll replacement, the response of the decrease bending device can be improved. Even in rolling mills with lower responsiveness, the high-responding increment bending device can compensate for the responsiveness of the decrease bending device, thereby providing a highly responsive and powerful plate crown and shape control function. it can.
Therefore, according to the rolling method of the present invention, it is possible to build a good plate crown and shape against disturbances that change during rolling, such as the rolled material entry side plate thickness and the rolled material temperature, and the product quality And the yield can be greatly improved.
本発明が対象とする圧延機の構造の一例を示す側面図である。It is a side view which shows an example of the structure of the rolling mill which this invention makes object. 本発明に係る圧延方法の操作フローの一例を示す図である。It is a figure which shows an example of the operation flow of the rolling method which concerns on this invention. 図2の操作フローに伴うロールベンディング力等の時系列変化を示す図である。It is a figure which shows time-sequential changes, such as roll bending force accompanying the operation flow of FIG. ディクリースベンディング装置の応答性が低い場合のロールベンディング力等の時系列変化を示す図である。It is a figure which shows time-sequential changes, such as roll bending force, when the responsiveness of a decrease bending apparatus is low. 本発明に係る圧延方法の操作フローの別の一例を示す図である。It is a figure which shows another example of the operation flow of the rolling method which concerns on this invention. 図5の操作フローに伴うロールベンディング力等の時系列変化を示す図である。It is a figure which shows time-sequential changes, such as roll bending force accompanying the operation flow of FIG. 本発明が対象とする圧延機の構造の別の一例を示す側面図である。It is a side view which shows another example of the structure of the rolling mill which this invention makes object. 本発明が対象とする圧延機の構造の別の一例を示す側面図である。It is a side view which shows another example of the structure of the rolling mill which this invention makes object.
 以下、図1~8を参照して、本発明に係る圧延方法について説明する。
 図1は本発明が対象とする圧延機の構造の一例を示す側面図であり、この圧延機を例に説明する。当該図に示すように、本発明が対象とする圧延機は、上下一対の作業ロール1−1、1−2とこれらをそれぞれ支持する上下一対の補強ロール2−1、2−2を備えた多段圧延機である。
 なお、当該図に示す圧延機は、薄鋼板ストリップの仕上げタンデム圧延機等に採用される形式の4段圧延機であるが、これに限定されず、6段圧延機であってもよい。
Hereinafter, the rolling method according to the present invention will be described with reference to FIGS.
FIG. 1 is a side view showing an example of the structure of a rolling mill targeted by the present invention, and this rolling mill will be described as an example. As shown in the figure, the rolling mill targeted by the present invention includes a pair of upper and lower work rolls 1-1 and 1-2 and a pair of upper and lower reinforcing rolls 2-1 and 2-2 for supporting them. It is a multi-stage rolling mill.
In addition, although the rolling mill shown in the figure is a four-high rolling mill of the type adopted for a finishing tandem rolling mill of a thin steel plate strip or the like, it is not limited to this and may be a six-high rolling mill.
 そして、この圧延機では、上作業ロール1−1にインクリースベンディング力を負荷する上インクリースベンディング装置6−1、6−2と、下作業ロール1−2にインクリースベンディング力を負荷する下インクリースベンディング装置6−3、6−4が、ハウジング9の内側に突出したプロジェクトブロック5−1、5−2に組み込まれている。
 このため、作業ロール1−1、1−2は、圧延操業による損耗によって定期的なロール組み替えが必要である。しかし、図1の圧延機は、ロール組み替え作業の度にインクリースベンディング装置の油圧配管を着脱する必要がない。それぞれのインクリースベンディング装置6−1~6−4は、固定配管された油圧配管を介してそれぞれの油圧制御弁に接続することができ、これにより高応答油圧制御のためのサーボバルブを採用することができる。したがって、応答性の高いインクリースベンディング装置とすることができる。
In this rolling mill, the upper increment bending devices 6-1 and 6-2 that apply an increase bending force to the upper work roll 1-1, and the lower operation load that applies an increase bending force to the lower work roll 1-2. Increment bending apparatuses 6-3 and 6-4 are incorporated in project blocks 5-1 and 5-2 protruding inside the housing 9.
For this reason, the work rolls 1-1 and 1-2 require periodic roll reassignment due to wear and tear due to rolling operation. However, the rolling mill of FIG. 1 does not need to attach or detach the hydraulic piping of the increment bending apparatus every time the roll is reassigned. Each of the increment bending apparatuses 6-1 to 6-4 can be connected to each hydraulic control valve via a fixed hydraulic pipe, thereby adopting a servo valve for high response hydraulic control. be able to. Therefore, it is possible to provide an incremental bending apparatus with high responsiveness.
 一方、上作業ロール1−1にディクリースベンディング力を負荷する上ディクリースベンディング装置7−1、7−2は上補強ロールチョック4−1に組み込まれ、下作業ロール1−2にディクリースベンディング力を負荷する下ディクリースベンディング装置7−3、7−4は下補強ロールチョック4−2に組み込まれている。
 このため、補強ロール2−1、2−2についても、作業ロールほどではないが圧延操業によって損耗するので定期的なロール組み替えが必要である。これにより、この圧延機は、ロール組み替え作業の度にディクリースベンディング装置7−1~7−4の油圧配管を着脱しなければならず、着脱時には油圧配管内に微小な異物が混入する可能性が高くなる。このため、それぞれのディクリースベンディング装置7−1~7−4には、高応答油圧制御のためのサーボバルブを採用することが困難となる。また、配管着脱を容易にするためにフレキシブル配管等の柔構造かつ着脱自在な油圧配管を介してそれぞれの油圧制御弁に接続しなければならない場合、柔構造であるが故に油圧の変動を吸収緩和してしまうこともある。
On the other hand, the upper decrease bending apparatuses 7-1 and 7-2 for applying a decrease bending force to the upper work roll 1-1 are incorporated in the upper reinforcing roll chock 4-1, and the decrease bending bending force is applied to the lower work roll 1-2. The lower decrease bending apparatuses 7-3 and 7-4 that load the lower reinforcement roll chock 4-2 are incorporated.
For this reason, the reinforcing rolls 2-1 and 2-2 are also worn out by the rolling operation although not as much as the work rolls, and therefore it is necessary to periodically change the roll. Thus, in this rolling mill, the hydraulic piping of the decrease bending devices 7-1 to 7-4 has to be attached / detached every time the roll is changed, and there is a possibility that minute foreign matter will be mixed in the hydraulic piping at the time of attachment / detachment. Becomes higher. For this reason, it becomes difficult to employ a servo valve for high response hydraulic control in each of the decrease bending apparatuses 7-1 to 7-4. In addition, if it is necessary to connect to each hydraulic control valve via flexible piping such as flexible piping and detachable hydraulic piping in order to facilitate mounting and dismounting of the piping, fluctuations in hydraulic pressure are absorbed and mitigated because of the flexible structure. Sometimes it ends up.
 したがって、ロール交換時における配管着脱の容易性からディクリースベンディング装置7−1~7−4の油圧配管にサーボバルブを採用せずにフレキシブル配管を採用したような場合には、ディクリースベンディング装置の応答性は、インクリースベンディング装置の応答性よりも低くなってしまう。
 このため、板クラウン・形状制御目的で作業ロールベンディング力としてディクリースベンディング力を作用させる場合には、圧延中に迅速に設定変更することが困難となる。このため、圧延材入側板厚や圧延材温度等の圧延中に変動する外乱因子に対し、適切なロールベンディング制御ができず、製品品質や歩留まりを低下させる場合が生じる。
Therefore, if flexible piping is used instead of servo valves for the hydraulic piping of the decrease bending devices 7-1 to 7-4 due to the ease of pipe attachment and detachment during roll replacement, the decrease bending device is The responsiveness is lower than the responsiveness of the increment bending apparatus.
For this reason, when a decrease bending force is applied as a work roll bending force for the purpose of plate crown and shape control, it is difficult to quickly change the setting during rolling. For this reason, appropriate roll bending control cannot be performed with respect to disturbance factors that change during rolling, such as the rolled material entry side plate thickness and the rolled material temperature, and the product quality and yield may be reduced.
 一方、ディクリースベンディング力は圧延荷重が負荷されていないアイドル時に負荷することができない。ディクリースベンディング力を適用する場合は、アイドル時のロールバランス状態から圧延開始時に迅速にディクリースベンディング力に切り換え、さらに圧延終了時に迅速にロールバランス状態に戻す必要がある。
 したがって、ロールベンディング力の変更を応答性に劣るディクリースベンディング装置の制御で実施すると、圧延材の先尾端において所定のディクリースベンディング力が負荷されずに形状不良部が長くなる可能性がある。
On the other hand, the decrease bending force cannot be applied during idling when no rolling load is applied. When applying the decrease bending force, it is necessary to quickly switch from the roll balance state at the time of idling to the decrease bending force at the start of rolling and to quickly return to the roll balance state at the end of rolling.
Therefore, if the roll bending force is changed under the control of the decrease bending device having poor responsiveness, a predetermined defect bending force may not be applied to the leading end of the rolled material, and the shape defect portion may become long. .
 ここで、特許文献2に記載のロールベンディング装置では、ロールベンディング装置の応答性を決定付けるのはサーボ弁の二次配管長さであるとしている。すなわち、各サーボ弁から油圧シリンダーまでの配管長さを2m以内に短縮し、インクリース側の油圧とディクリース側の油圧の差をサーボ弁を介して制御することで、ベンディング力の高い応答性を確保できるとしている。しかし、作業ロールや補強ロールの組み替え作業は定期的に実施しなければならないものなので、インクリース側とディクリース側の双方を固定油圧配管とすることは非現実的である。そのため、本願発明の課題であるディクリースベンディングを作用させるときの応答性を上げることは十分にはできない。 Here, in the roll bending apparatus described in Patent Document 2, the responsiveness of the roll bending apparatus is determined by the secondary pipe length of the servo valve. In other words, the pipe length from each servo valve to the hydraulic cylinder is shortened to within 2m, and the difference between the oil pressure on the lease side and the oil pressure on the decrease side is controlled via the servo valve, resulting in high responsiveness of bending force. Can be secured. However, it is impractical to use fixed hydraulic piping on both the lease side and the decrease side because the work rolls and the reinforcement rolls must be reassembled regularly. For this reason, it is not possible to sufficiently increase the responsiveness when the decrease bending, which is the subject of the present invention, is applied.
 本発明に係る圧延方法は、特許文献2での課題をも解決するものである。
 なお、インクリースベンディング装置とは、ロール開度を大きくする方向の力を作業ロールチョックに与える油圧装置を意味している。インクリースベンディング装置とは、そのアクチュエータである油圧シリンダーを含む装置の総称である。本発明では、説明を簡単にするため、インクリースベンディング装置とは、特に断りの無い限りそのアクチュエータである油圧シリンダーのことをさすものとする。そして、インクリースベンディング装置によって作業ロールに負荷される力をインクリースベンディング力と称する。一方、ロール開度を小さくする方向の力を作業ロールチョックに与える油圧装置をディクリースベンディング装置、そして、これによって作業ロールに負荷される力をディクリースベンディング力と称する。また、ディクリースベンディング装置とは、そのアクチュエータである油圧シリンダーを含む装置の総称である。しかし、本発明では、説明を簡単にするため、ディクリースベンディング装置とは、特に断りの無い限り、そのアクチュエータである油圧シリンダーを指すものとする。
The rolling method according to the present invention also solves the problem in Patent Document 2.
The increment bending apparatus means a hydraulic apparatus that applies a force in the direction of increasing the roll opening degree to the work roll chock. The increment bending apparatus is a general term for apparatuses including a hydraulic cylinder as an actuator. In the present invention, in order to simplify the description, the increment bending apparatus refers to a hydraulic cylinder that is an actuator thereof unless otherwise specified. A force applied to the work roll by the increase bending apparatus is referred to as an increase bending force. On the other hand, a hydraulic device that applies a force in the direction of decreasing the roll opening degree to the work roll chock is referred to as a decrease bending device, and a force applied to the work roll by this is referred to as a decrease bending force. The decrease bending apparatus is a general term for apparatuses including a hydraulic cylinder as an actuator. However, in the present invention, in order to simplify the description, the decrease bending apparatus refers to a hydraulic cylinder that is an actuator thereof unless otherwise specified.
 図2は本発明に係る圧延方法の操作フローの一例を示す図であり、より具体的には、応答性の高いインクリースベンディング装置とこれに比べてやや応答性の低いディクリースベンディング装置の操作フローを示す図である。
 また、図3にこの圧延方法に従った場合における、一本の圧延材に対する圧延操業に伴うロールベンディング力等の時系列変化を示す。図3には上から圧延荷重、インクリースベンディング装置の出力、ディクリースベンディング装置の出力、合力としての作業ロールベンディング力の時系列変化を示している。以下、図2、3に基づいて説明する。
FIG. 2 is a diagram showing an example of the operation flow of the rolling method according to the present invention. More specifically, FIG. 2 shows the operation of an increase bending device having a high responsiveness and a slightly bending responsive bending device. It is a figure which shows a flow.
FIG. 3 shows time-series changes in roll bending force and the like accompanying a rolling operation for a single rolled material when this rolling method is followed. FIG. 3 shows time-series changes in the rolling load, the output of the increment bending apparatus, the output of the decrease bending apparatus, and the work roll bending force as a resultant force from the top. Hereinafter, a description will be given with reference to FIGS.
 まずは圧延開始前に、次に圧延する圧延材に対応する設定計算を実施し、作業ロールベンディング力の設定値Fを演算・出力する。ここではFが負の値、すなわちディクリースベンディング力と演算されたものとする。なお、本発明では、ロールベンディング力は、インクリースベンディング力(インクリース方向(ロールを開く方向)の力)を正の値、ディクリースベンディング力(ディクリース方向(ロールを押し付ける方向)の力)を負の値と定義する。 First before the start of rolling, then performs the setting calculations corresponding to the rolling member rolling, which calculates and outputs the set value F R of the work roll bending force. Here F R is a negative value, that is, those which are calculated as decrease-bending force. In the present invention, the roll bending force is the increase bending force (the force in the increase direction (the direction in which the roll is opened)), and the decrease bending force (the force in the decrease direction (the direction in which the roll is pressed)). Is defined as a negative value.
 圧延開始前は、インクリースベンディング力とディクリースベンディング力の双方を作用させ、合力としてロールバランス力(F)に相当するインクリース側のロールベンディング力が作業ロールチョックに作用するようにする。
 すなわち、圧延前のアイドル時には、インクリースベンディング装置出力をI(>0)、ディクリースベンディング装置出力をD(<0)とし、I+Dがロールバランス力F(>0)として作用する。
 なお、ロールバランス力Fは、空転状態のミル加減速においても電動機で駆動される作業ロールと従動となる補強ロールがスリップしない力として決められ、またDはディクリースベンディング装置のアクチュエータが作業ロールチョックから離れてしまわない程度の最小の油圧で設定すればよい。
Prior to the start of rolling, both the increase bending force and the decrease bending force are applied, and the roll bending force on the increase side corresponding to the roll balance force (F B ) is applied to the work roll chock as a resultant force.
That is, at idle before rolling, the increment bending device output is I B (> 0), the decrease bending device output is D B (<0), and I B + D B is the roll balance force F B (> 0). Works.
Incidentally, the roll balancing force F B is rolls as a work roll and a driven which are driven by an electric motor in mill deceleration idling state is determined as a force that does not slip, also D B working actuator of decrease-bending device What is necessary is just to set it with the minimum oil pressure that does not leave the roll chock.
 そして圧延開始直前のあるタイミング(時間軸上のa点)において、圧延中作業ロールベンディング力Fを作用させるのに十分な所定の圧延中ディクリースベンディング装置出力DをD=F−Iによって演算する。そして、ロールバランス力(F)が一定となるように、DおよびIを同時に出力する。
 ここで、Iは圧延中のインクリースベンディング装置出力であり、Dの絶対値が過大にならないように制御可能な最小値に近い値を予め決めておき、IはI+D=Fとなるように決められたインクリースベンディング装置出力とする。
 したがって、設定タイミングにおいては、合力としての作業ロールベンディング力はFのままで実質的に変化しない。
And in a rolling immediately before the start timing (a point on the time axis), a sufficient predetermined rolling in decrease-bending device output D S to exert the work roll bending force F R during rolling D S = F R - computing the I R. As the roll balancing force (F B) is constant, at the same time outputs the D S and I S.
Here, I R is-bending device output during rolling, is determined in advance to a value close to the minimum controllable value such that the absolute value of D S is not excessive, I S is I S + D S = and F B to become so-determined-bending device output.
Therefore, in the setting timing, the work roll bending force of the resultant force is substantially unchanged remains F B.
 次に、圧延開始直後に、ディクリースベンディング力は一定値を保持する制御を継続しつつインクリースベンディング力を低下させ、合力として所定のディクリース側のロールベンディング力が作業ロールチョックに作用する状態にして圧延を行う。
 すなわち、圧延開始タイミング(時間軸上のb点)において、インクリースベンディング装置出力をIからIに変更する。このようにすることで応答の遅いディクリースベンディング装置出力はDのままで応答の速いインクリースベンディング装置の制御によって、合力としての作業ロールベンディング力をロールバランス力F(>0)からディクリースベンディング力F(<0)に迅速に切り換えることができる。
 なお、圧延開始時(b)とは、圧延を開始した時点をさし、その検出は、例えば圧延機の圧延荷重測定用ロードセルによって検出される荷重が、設定計算で予測演算された圧延荷重の、例えば30%を超えたタイミングとする方法で決めれば良い。この値は、10~30%の間で設定することが望ましい。ロールバランス力の変動と区別ができ、また、圧延開始を迅速に検出することができるからである。
Next, immediately after the start of rolling, the increase bending force is decreased while continuing the control to keep the constant bending force constant, so that the roll bending force on the predetermined decrease side acts on the work roll chock as a resultant force. Rolling.
That is, in the rolling start timing (b point on the time axis), is changed to I R ink bending device output from the I S. The control of the quick-bending apparatus responsive remains of such slow decrease-bending device output response by the D S, the decrease-the work roll bending force of the resultant force from the roll balancing force F B (> 0) can be quickly switched to-bending force F R (<0).
Note that the rolling start time (b) refers to the time point when the rolling is started, and the detection thereof is, for example, the load detected by the load cell for measuring the rolling load of the rolling mill is the rolling load predicted and calculated in the setting calculation. For example, it may be determined by a method in which the timing exceeds 30%. This value is preferably set between 10 and 30%. This is because it can be distinguished from fluctuations in roll balance force, and the start of rolling can be detected quickly.
 そして、圧延終了時に、ロールベンディング力を圧延開始前の状態に戻して、合力としてロールバランス力に相当するインクリース側のロールベンディング力を作業ロールチョックに作用させ、この状態で金属板材の圧延を終了する。
 すなわち、圧延終了タイミング(時間軸上のc点)において、ディクリースベンディング装置出力はDのままで応答の速いインクリースベンディング装置出力をIからIに戻す。このようにすることで、合力としての作業ロールベンディング力をディクリースベンディング力F(<0)からロールバランス力F(>0)に迅速に切り換えることができる。
 なお、圧延終了タイミング(時間軸上のc点)とは、圧延終了時をさす。その検出は、圧延機の圧延荷重測定用ロードセルによって検出される荷重が、圧延中の実績圧延荷重を時系列平均した値の、例えば50%を下回ったタイミングとする方法で決めれば良い。この値は、任意に設定することができるが、50~80%の間で設定することが望ましい。圧延中のロールベンディング力の変動と区別ができ、圧延終了を迅速に検出するためである。
Then, at the end of rolling, the roll bending force is returned to the state before starting rolling, and the roll bending force on the increase side corresponding to the roll balance force is applied to the work roll chock as a resultant force, and the rolling of the metal plate material is finished in this state. To do.
That is, in the rolling end timing (c point on the time axis), decrease-bending device output returns the fast-bending device output response remains D S from I R to I S. In this way, the work roll bending force as a resultant force can be quickly switched from the decrease bending force F R (<0) to the roll balance force F B (> 0).
The rolling end timing (point c on the time axis) refers to the end of rolling. The detection may be determined by a method in which the load detected by the load cell for measuring the rolling load of the rolling mill is set to a timing when the actual rolling load during rolling is less than 50% of a value obtained by time-series averaging, for example. This value can be set arbitrarily, but is preferably set between 50 and 80%. This is because it can be distinguished from fluctuations in roll bending force during rolling, and the end of rolling can be detected quickly.
 そして圧延終了タイミングから、例えば、1~3秒経過した時点を作業完了タイミングdとし、このタイミングで、インクリースベンディング装置出力をI、ディクリースベンディング装置出力をDとする。この変更では、合力としての作業ロールベンディング力はロールバランス力Fにほぼ維持される。 Then a rolled end timing, for example, the time of the lapse of one to three seconds and work completion timing d, at this timing, the increase-bending device output I B, the decrease-bending device output and D B. This change work roll bending force of the resultant force is substantially maintained in the roll balancing force F B.
 図2、3に示すように、本発明に係る圧延方法では、圧延開始時および圧延終了時のロールベンディング力の変更を、プロジェクトブロックに配備した応答性の高いインクリースベンディング装置を用いて行う。このために、インクリースベンディング装置と比較して応答性の低いディクリースベンディング装置を配備せざるを得ない場合であっても、これを応答性の高いインクリースベンディング装置が補償するので、高応答かつ強力な板クラウン・形状制御機能を付与することができる。
 さらに、圧延中に種々の要因(外乱)により圧延力が変化する場合であっても、高応答なインクリースベンディング装置で、最適な作業ロールベンディング力を維持するように迅速に制御することが可能である。
 すなわち、本発明に係る圧延方法によれば、圧延材入側板厚や圧延材温度等の圧延中に変動する外乱に対しても良好な板クラウン・形状を造り込むことが可能であり、製品品質および歩留を大きく改善することができる。
As shown in FIGS. 2 and 3, in the rolling method according to the present invention, the roll bending force is changed at the start of rolling and at the end of rolling using a highly responsive increment bending apparatus provided in the project block. For this reason, even if it is unavoidable to deploy a decrease bending device that is less responsive than an increase bending device, a highly responsive increase bending device compensates for this. In addition, a powerful plate crown / shape control function can be provided.
Furthermore, even when the rolling force changes due to various factors (disturbances) during rolling, it is possible to quickly control to maintain the optimal work roll bending force with a highly responsive incremental bending device. It is.
That is, according to the rolling method of the present invention, it is possible to build a good plate crown and shape against disturbances that change during rolling, such as the rolled material entry side plate thickness and the rolled material temperature, and the product quality And the yield can be greatly improved.
 図4はディクリースベンディング装置の応答性が低い場合(特に反力が抜けると圧力が下がってしまう油圧特性を持つ場合)のロールベンディング力等の時系列変化を示す図である。図3と同様に、図2に示すインクリースベンディング装置とディクリースベンディング装置の操作フローに従った場合の、一本の圧延材に対する圧延操業に伴うロールベンディング力等の時系列変化を示している。すなわち、図2、3の場合に比べてディクリースベンディング装置の応答速度が遅い場合の例を示している。 FIG. 4 is a diagram showing time-series changes in roll bending force and the like when the response of the decrease bending apparatus is low (especially when the reaction force is reduced and the pressure drops when the reaction force is released). Similar to FIG. 3, a time-series change in roll bending force and the like accompanying a rolling operation on a single rolled material when the operation flow of the increment bending apparatus and the decrease bending apparatus shown in FIG. 2 is followed is shown. . That is, an example in which the response speed of the decrease bending apparatus is slower than in the case of FIGS.
 この例のようにディクリースベンディング装置の応答性が低い場合には、タイミングbおよびcにおいて応答性の高いインクリースベンディング装置が急激に変化ため、応答性の悪いディクリースベンディング装置の出力が変動する。その結果、合力としての作業ロールベンディング力は、タイミングbではFに到達するのが遅れ、タイミングcではFに到達するのが遅れることになる。図5に示す圧延方法は、この問題を解決するものである。 When the response of the decrease bending apparatus is low as in this example, the increase bending apparatus having high response at the timings b and c changes abruptly, and the output of the decrease bending apparatus having poor response varies. . As a result, the work roll bending force as resultant force, delays to reach the timing b in F R, it will be delayed possible to reach the timing c in F B. The rolling method shown in FIG. 5 solves this problem.
 図5は本発明に係る圧延方法の操作フローの別の一例を示す図であり、応答性の高いインクリースベンディング装置と図2、3の場合に比べて応答性の低いディクリースベンディング装置の操作フローを示す図である。以下、当該図に基づいて説明する。
 図5に示す圧延方法では、ディクリースベンディング装置につながる油圧配管内の油圧を測定し求めたディクリースベンディング力、または該装置に設置したロードセルにより測定したディクリースベンディング力に基づいてインクリースベンディング装置を制御する。すなわち、圧延前後は作業ロールベンディング力がロールバランス力Fとなるように、圧延中については作業ロールベンディング力がFとなるように、インクリースベンディング装置の出力を、ディクリースベンディング力またはディクリースベンディング装置の油圧に応じて制御する。なお、これ以外の制御は図2に示す圧延方法と同様である。
 図5に示す圧延方法で圧延することで、図6に示すように、ディクリースベンディング装置の出力の変動をインクリースベンディング装置が補償して、作業ロールベンディング力としては高応答な制御を実現することができる。
 また、圧延中のディクリースベンディング力の測定や、油圧測定によるフィードバック制御をしなくても、ディクリースベンディング装置の出力の変動を予め予測し、それを補償するインクリースベンディング装置の出力を設定することでも、同様の効果を得ることができる。
FIG. 5 is a diagram showing another example of the operation flow of the rolling method according to the present invention, in which the operation of the incremental bending apparatus with high responsiveness and the decrease bending apparatus with low responsiveness compared to the case of FIGS. It is a figure which shows a flow. Hereinafter, a description will be given based on the drawing.
In the rolling method shown in FIG. 5, the increment bending apparatus based on the decrease bending force obtained by measuring the hydraulic pressure in the hydraulic pipe connected to the decrease bending apparatus or the decrease bending force measured by the load cell installed in the apparatus. To control. That is, before and after rolling, as the work roll bending force is roll balancing force F B, as the work roll bending force for during rolling becomes F R, the output of the increase-bending device, decrease-bending force or decrease- Control according to the hydraulic pressure of the leasing bending machine. The other control is the same as the rolling method shown in FIG.
By rolling with the rolling method shown in FIG. 5, as shown in FIG. 6, the increase bending device compensates for the fluctuation of the output of the decrease bending device, and the work roll bending force is realized with high response control. be able to.
In addition, it is possible to predict the fluctuation of the output of the decrease bending apparatus in advance and set the output of the increment bending apparatus to compensate for it without the need for measuring the bending bending force during rolling or feedback control by measuring the hydraulic pressure. In this way, the same effect can be obtained.
 図7及び図8は本発明が対象とする圧延機の構造の別の一例を示す側面図である。これらの圧延機は、上作業ロール1−1の胴部に付加される圧延方向力を、プロジェクトブロック5−1、5−2ではなく、ハウジングウィンドウ12で受けてロール開度を大きくできるように改善したものである。
 このうち図7に示す圧延機は、下作業ロール1−2にディクリースベンディング力を負荷する下ディクリースベンディング装置7−3、7−4を下補強ロールチョック4−2に配備した圧延機である。図8に示す圧延機は、下ディクリースベンディング装置7−3、7−4をプロジェクトブロック5−1、5−2の下方に位置する専用のプロジェクトブロック5−3、5−4に配備した圧延機である。
 これらの圧延機についても本発明に係る圧延方法を適用することができ、これにより圧延材入側板厚や圧延材温度等の圧延中に変動する外乱に対しても良好な板クラウン・形状を造り込むことが可能であり、製品品質および歩留を大きく改善することができる。
7 and 8 are side views showing another example of the structure of the rolling mill targeted by the present invention. These rolling mills can receive the rolling direction force applied to the body of the upper work roll 1-1 not by the project blocks 5-1 and 5-2 but by the housing window 12 so that the roll opening degree can be increased. It is an improvement.
Among these, the rolling mill shown in FIG. 7 is a rolling mill in which lower decrease bending apparatuses 7-3 and 7-4 for applying a decrease bending force to the lower work roll 1-2 are arranged in the lower reinforcing roll chock 4-2. . The rolling mill shown in FIG. 8 is a rolling machine in which the lower decrease bending apparatuses 7-3 and 7-4 are arranged in dedicated project blocks 5-3 and 5-4 located below the project blocks 5-1 and 5-2. Machine.
The rolling method according to the present invention can also be applied to these rolling mills, and this makes it possible to produce a good plate crown and shape against disturbances that change during rolling, such as the thickness of the rolled material entry side and the temperature of the rolled material. Product quality and yield can be greatly improved.
 本発明は、鋼板の圧延、特に大開度を必要とするリバース圧延機などに利用することができる。 The present invention can be used for rolling a steel sheet, particularly a reverse rolling mill that requires a large opening.
1−1 上作業ロール
1−2 下作業ロール
2−1 上補強ロール
2−2 下補強ロール
3−1 上作業ロールチョック
3−2 下作業ロールチョック
4−1 上補強ロールチョック
4−2 下補強ロールチョック
5−1 入側プロジェクトブロック
5−2 出側プロジェクトブロック
5−3 入側下プロジェクトブロック
5−4 出側下プロジェクトブロック
6−1 入側上インクリースベンディング装置
6−2 出側上インクリースベンディング装置
6−3 入側下インクリースベンディング装置
6−4 出側下インクリースベンディング装置
7−1 入側上ディクリースベンディング装置
7−2 出側上ディクリースベンディング装置
7−3 入側下ディクリースベンディング装置
7−4 出側下ディクリースベンディング装置
8−1 入側補強ロールバランス装置
8−2 出側補強ロールバランス装置
9 ハウジング
10 被圧延材
11 圧下装置
12 ハウジングウィンドウ
1-1 Upper Work Roll 1-2 Lower Work Roll 2-1 Upper Reinforcement Roll 2-2 Lower Reinforcement Roll 3-1 Upper Work Roll Chock 3-2 Lower Work Roll Chock 4-1 Upper Reinforcement Roll Chock 4-2 Lower Reinforcement Roll Chock 5- 1 Incoming Project Block 5-2 Outgoing Project Block 5-3 Incoming Lower Project Block 5-4 Outgoing Lower Project Block 6-1 Incoming Upper Increase Bending Device 6-2 Outgoing Upper Increase Bending Device 6- 3 Incoming Lower Increase Bending Device 6-4 Outgoing Lower Increase Bending Device 7-1 Incoming Upper Decrease Bending Device 7-2 Outgoing Upper Decrease Bending Device 7-3 Incoming Lower Decrease Bending Device 7- 4 Outgoing lower decrease bending device 8-1 Entry-side reinforcing roll balance device -2 exit side rolls balancing device 9 housing 10 the material to be rolled 11 screw down device 12 housing window

Claims (3)

  1.  インクリースベンディング力を発生するインクリースベンディング装置と、ディクリースベンディング力を発生するディクリースベンディング装置を有し、前記インクリースベンディング装置に比べて前記ディクリースベンディング装置の応答性が低い圧延機を用いて行う金属板材の圧延方法であって、
     圧延開始前に、インクリースベンディング力とディクリースベンディング力の双方を作用させ、合力としてロールバランス力に相当するロールベンディング力を作業ロールチョックに作用させ、
     その後、圧延開始時に、ディクリースベンディング力を前記所定の圧延中ディクリースベンディング力を保持しつつインクリースベンディング力を変化させ、合力として所定の圧延中作業ロールベンディング力を作業ロールチョックに作用させ、
     圧延中は、インクリースベンディング力を制御することにより、前記所定の圧延中作業ロールベンディング力を維持するように圧延を行い、
     その後、圧延終了時に、インクリースベンディング力を変化させ、ディクリースベンディング力との合力として、ロールバランス力に相当するロールベンディング力を作業ロールチョックに作用させ、この状態で金属板材の圧延を終了することを特徴とする金属板材の圧延方法。
    A rolling mill having an increment bending device that generates an increase bending force and a decrease bending device that generates a decrease bending force is used, and the responsiveness of the decrease bending device is lower than that of the increase bending device. A method of rolling a metal sheet,
    Before starting rolling, both the increase bending force and the decrease bending force are applied, and the roll bending force corresponding to the roll balance force is applied to the work roll chock as a resultant force.
    Thereafter, at the start of rolling, the increase bending force is changed while maintaining the decrease bending force during the predetermined rolling, and the work roll bending force during the predetermined rolling is applied to the work roll chock as a resultant force.
    During rolling, by controlling the increment bending force, the rolling is performed so as to maintain the work roll bending force during the predetermined rolling,
    Then, at the end of rolling, change the increment bending force, and apply the roll bending force corresponding to the roll balance force to the work roll chock as a resultant force with the decrease bending force, and finish rolling the metal sheet in this state A method for rolling a metal sheet.
  2.  前記圧延機が、さらに一対の上下作業ロールとこれらをそれぞれ支持する一対の上下補強ロールを有し、
     上下作業ロールのそれぞれに対する前記インクリースベンディング装置を構成するインクリース油圧シリンダーは圧延機ハウジングの内側に突出したプロジェクトブロックに組み込まれ、当該インクリース油圧シリンダーの油圧制御弁には固定された油圧配管が接続される構造を有し、
     さらに、上作業ロールに対する前記ディクリースベンディング装置を構成するディクリース油圧シリンダーは上補強ロールチョックに組み込まれ、当該ディクリース油圧シリンダーの油圧制御弁には柔構造かつ着脱自在な油圧配管が接続される構造を有する圧延機であって、当該圧延機を用いて行うことを特徴とする請求項1に記載の金属板材の圧延方法。
    The rolling mill further includes a pair of upper and lower work rolls and a pair of upper and lower reinforcing rolls that respectively support them,
    An increase hydraulic cylinder constituting the increase bending apparatus for each of the upper and lower work rolls is incorporated in a project block protruding inside the rolling mill housing, and a hydraulic pipe fixed to the hydraulic control valve of the increase hydraulic cylinder is provided. Having a connected structure,
    Further, the decrease hydraulic cylinder constituting the decrease bending apparatus for the upper work roll is incorporated in the upper reinforcing roll chock, and a flexible and detachable hydraulic pipe is connected to the hydraulic control valve of the decrease hydraulic cylinder. The rolling method for a metal sheet according to claim 1, wherein the rolling is performed using the rolling mill.
  3.  前記ディクリース油圧シリンダー内あるいは該シリンダーにつながる油圧配管内の油圧を測定し、その測定値に基づき、作業ロールチョックに作用するロールベンディング力が所定の値になるようにインクリースベンディング力を制御することを特徴とする請求項2に記載の金属板材の圧延方法。 Measure the hydraulic pressure in the decrease hydraulic cylinder or in the hydraulic piping connected to the cylinder, and control the increase bending force so that the roll bending force acting on the work roll chock becomes a predetermined value based on the measured value. The method for rolling a metal sheet according to claim 2.
PCT/JP2011/050785 2010-03-31 2011-01-12 Rolling of metal strip WO2011122070A1 (en)

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