WO2012128019A1 - 金属板材の圧延機および圧延方法 - Google Patents

金属板材の圧延機および圧延方法 Download PDF

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Publication number
WO2012128019A1
WO2012128019A1 PCT/JP2012/055515 JP2012055515W WO2012128019A1 WO 2012128019 A1 WO2012128019 A1 WO 2012128019A1 JP 2012055515 W JP2012055515 W JP 2012055515W WO 2012128019 A1 WO2012128019 A1 WO 2012128019A1
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WO
WIPO (PCT)
Prior art keywords
roll
rolling
force
work roll
bending force
Prior art date
Application number
PCT/JP2012/055515
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English (en)
French (fr)
Japanese (ja)
Inventor
泰輔 岩城
和宏 西山
邦彦 若月
比護　剛志
小川　茂
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 KR1020137013858A priority Critical patent/KR101392078B1/ko
Priority to EP20120761152 priority patent/EP2626149B1/en
Priority to CN201280003946.2A priority patent/CN103237609B/zh
Priority to JP2012524041A priority patent/JP5059250B1/ja
Publication of WO2012128019A1 publication Critical patent/WO2012128019A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B29/00—Counter-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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/18—Adjusting or positioning rolls by moving rolls axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/203—Balancing rolls

Definitions

  • the present invention relates to a rolling machine and a rolling method for a metal plate material.
  • the present invention is particularly suitable for a thick plate rolling machine, a thin plate hot rolling rough rolling mill or a finishing rolling mill, and can make a large maximum opening between the upper and lower work rolls and easily provide a strong roll bending force.
  • the present invention relates to a rolling mill that can be imparted, and as a result, can impart a highly responsive and powerful sheet crown / shape control function, and a rolling method using the rolling mill.
  • the rolling mill type disclosed in Patent Document 1 is a four-high rolling mill, and the rolling mill type has a structure shown in FIG. That is, the upper work roll chock 3-1 is held by the arm portion connected to the upper reinforcement roll chock 4-1.
  • the rolling mill type has a structure shown in FIG. That is, the upper work roll chock 3-1 is held by the arm portion connected to the upper reinforcement roll chock 4-1.
  • the upper work roll chock 3-1 contacts the inner side surface of the arm portion of the upper reinforcing roll chock 4-1, and further, the side surface of this arm portion contacts the inner side surface of the housing window. Therefore, the risk of occurrence of meandering / cambering of the metal plate during rolling due to an increase in the shakiness in the rolling direction increases.
  • Patent Document 2 discloses a rolling mill in which an increase bending apparatus for a work roll is incorporated in a work roll chock.
  • Patent Document 3 discloses a roll-cross type rolling mill. Also in this rolling mill, the increment bending apparatus is incorporated in the work roll chock.
  • This type of rolling mill has the following problems. (5) When changing the work roll, it is necessary to attach and detach the hydraulic piping. If it is attempted to attach and detach easily, flexible piping must be employed, and it becomes difficult to employ a servo valve for high response hydraulic control. Therefore, it is difficult to configure a bending device with high responsiveness.
  • Patent Document 4 discloses a rolling mill having a work roll shift function.
  • the increment bending apparatuses 6-1 to 6-4 are incorporated in project blocks 5-1 and 5-2 integrated with the housing 9.
  • the lower increase bending apparatuses 6-3 and 6-4 acting on the lower work roll 1-2 are incorporated in a project block protruding inward from the housing 9.
  • this type of rolling mill has the following problems. (6) Since the contact surface between the project block and the work roll chock supports the rolling direction force acting on the work roll, the contact surface becomes smaller as the roll opening is increased. Accordingly, it is impossible to properly support the work roll chock, and a large roll opening degree cannot be obtained.
  • 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, and is a generic name for an apparatus including a hydraulic cylinder that is an actuator and a piston rod.
  • the increment bending apparatus refers to a hydraulic cylinder and its piston rod as its actuator unless otherwise specified.
  • the force applied to the work roll by the increment bending apparatus is referred to as an increment bending force.
  • a hydraulic device that applies a force in the direction of decreasing the roll opening to the work roll chock is referred to as a decrease bending device.
  • a force applied to the work roll by the decrease bending apparatus is referred to as a decrease bending force.
  • the decrease bending device is a general term for devices including a hydraulic cylinder as an actuator and a piston rod.
  • the decrease bending device refers to a hydraulic cylinder and a piston rod as actuators unless otherwise specified.
  • a rolling machine for producing thick steel plates is not provided with a decrease bending apparatus as shown in FIGS. 12 to 16 (see Patent Documents 1 to 4).
  • A in the case of thick plate rolling, a relatively large diameter work roll is used compared to thin plate rolling, so that even if the same bending force is applied, the change in roll crown shape is small.
  • B Compared with the sheet rolling mill, even if a small decrease bending device is installed in a narrow area around a relatively large diameter work roll chock, the control range is narrow and the mechanical structure is only complicated. This is due to disadvantages in cost performance.
  • Japanese Unexamined Patent Publication No. 6-87011 Japanese Unexamined Patent Publication No. Sho 62-220205 Japanese Laid-Open Patent Publication No. 6-198307 Japanese Unexamined Patent Publication No. 4-52014
  • the problem to be solved by the present invention is to provide a rolling mill capable of increasing the maximum opening between the upper and lower work rolls and imparting a strong roll bending force, and a rolling method using the rolling mill. That is. That is, an object of the present invention is to provide a rolling mill that can accommodate a wide range of steel plates, and on the premise that the same bending bending apparatus as that of a thin sheet rolling mill is provided, a roll between upper and lower work rolls. The present invention is to provide a rolling mill that can take a large opening and that can easily impart a strong roll bending force and overcomes the above-mentioned drawbacks of the conventional rolling mill and a rolling method using this rolling mill. .
  • a first aspect of the present invention includes an upper work roll and a lower work roll for rolling a metal plate material; an upper reinforcement roll and a lower reinforcement roll that respectively support the upper work roll and the lower work roll; An upper work roll chock and a lower work roll chock that respectively support the work roll and the lower work roll; an upper reinforcement roll chock and a lower reinforcement roll chock that respectively support the upper reinforcement roll and the lower reinforcement roll; the upper work roll chock and the lower work
  • a pair of first project blocks that house a roll chock, the upper reinforcing roll chock, and the lower reinforcing roll chock and that bear in the rolling direction force acting on the lower work roll projecting inward from each other are provided on the upper work roll.
  • a housing window is formed that bears the acting rolling direction force.
  • a first hydraulic cylinder provided in the pair of first project blocks and having a first piston rod for applying an increase bending force to the upper work roll via the upper work roll chock; and the pair of first projects
  • a second hydraulic cylinder provided in a project block and having a second piston rod for applying an increment bending force to the lower work roll via the lower work roll chock; and provided in the upper reinforcing roll chock
  • a third hydraulic cylinder having a third piston rod for applying a decrease bending force or bringing the upper work roll into contact with the upper reinforcing roll to generate a roll balance force; and a decrease bending force for the lower work roll 4th piston rod to give A fourth hydraulic cylinder and; a rolling mill of a metal plate with a.
  • the first hydraulic cylinder and the second hydraulic cylinder are provided at different positions on the plan view in the pair of first project blocks. May be.
  • the lower reinforcing roll chock may be provided with the fourth hydraulic cylinder.
  • the housing includes a pair of second project blocks that project inward from the housing below the pair of first project blocks. Further, the fourth hydraulic cylinder may be provided in the pair of second project blocks.
  • a second aspect of the present invention is a method of rolling a metal sheet using the rolling mill described in any one of (1) to (5) above, wherein the first hydraulic cylinder When rolling at a roll opening degree exceeding the stroke, the rolling method of the metal plate material is such that a roll balance force is generated by pulling the third piston rod.
  • a third aspect of the present invention is a method of rolling a metal sheet using the rolling mill described in any one of (1) to (5) above, wherein the first hydraulic cylinder When rolling at a roll opening that does not exceed the stroke, before the rolling is started, both the increase bending force and the decrease bending force are applied to the upper work roll and the lower work roll, thereby producing a roll as a resultant force.
  • the second step of increasing the increase bending force so that the resultant force maintains the roll balance force At the start of rolling, by changing the increase bending force while maintaining the decrease bending force, a roll bending force corresponding to the roll bending force during rolling acts on the upper work roll and the lower work roll as a resultant force.
  • a fourth aspect of the present invention is a method for rolling a metal plate material using the rolling mill described in any one of (1) to (5) above, wherein the first hydraulic pressure is applied during rolling.
  • the roll balance force of the upper work roll is applied by pulling the third piston rod, and then the stroke of the first hydraulic cylinder is not exceeded.
  • both the increase bending force and the decrease bending force are applied to the upper work roll and the lower work roll before the start of rolling.
  • a first step in which a roll bending force is applied to the upper work roll and the lower work roll, and then the decrease bending force is applied during rolling.
  • a sixth step of reducing the increase bending force and the increase bending force is performed so as to maintain the roll balance force.
  • the hydraulic pressure in the third hydraulic cylinder, the hydraulic pressure in the hydraulic piping connected to the third hydraulic cylinder, the hydraulic pressure in the fourth hydraulic cylinder, and At least one of the hydraulic pressures in the hydraulic piping connected to the fourth hydraulic cylinder is continuously measured, and based on the measured value, the roll bending force acting on the upper work roll chock and the lower work roll chock is a predetermined force.
  • the increase bending force may be controlled to be a value.
  • the maximum opening between the upper and lower work rolls can be increased, and a decrease bending device having low response must be provided. Even if it is not, this can be compensated by a highly responsive increase bending device arranged in the pair of first project blocks, and a highly responsive and powerful plate crown / shape control function can be provided. Therefore, it is possible to build a good plate crown and shape against disturbances that change during rolling, such as the rolled material entry side thickness and the rolled material temperature, which can greatly improve product quality and yield. .
  • the upper work roll not only can be provided with an increase bending force and a decrease bending force to realize a powerful plate crown and shape control function, but also the upper work roll decrease bending machine has a double-acting hydraulic cylinder.
  • the roll balance force can be generated by adopting, so that a large opening roll gap can be realized.
  • a single unit can cope with the bulk rolling with a large plate thickness to the hot rolled thin plate rolling that requires accurate plate crown and shape control.
  • the upper work roll chock can be stably supported.
  • the upper and lower increase bending apparatuses can be incorporated into the pair of first project blocks.
  • FIG. 1 It is a side view which shows the structure of the rolling mill which concerns on one Embodiment of this invention. It is a figure which shows the connection structure of an upper work roll chock and an upper decrease bending apparatus. It is sectional drawing which shows the 1st aspect of the engagement relation of the 1st engagement part of the 3rd piston rod of a 3rd hydraulic cylinder, and the 2nd engagement part of an upper work roll chock. It is sectional drawing which shows the 2nd aspect of the engagement relation of the 1st engagement part of the 3rd piston rod of a 3rd hydraulic cylinder, and the 2nd engagement part of an upper work roll chock.
  • FIG. 1 is a side view showing an example of the structure of a rolling mill 1 according to an embodiment of the present invention.
  • the rolling mill 1 according to an embodiment of the present invention includes an upper work roll chock 3-1 and a lower work roll chock 3-2, an upper reinforcement roll chock 4-1, and a lower reinforcement roll chock 4-2.
  • the housing 9 is integrally formed with a pair of first project blocks 5-1 and 5-2 (that is, a first project block provided on the entrance side of the metal plate and a first project block provided on the exit side).
  • a housing window 12 is also formed.
  • the upper work roll chock 3-1 supports the upper work roll 1-1 for rolling the metal plate material
  • the lower work roll chock 3-2 supports the lower work roll 1-2 for rolling the metal plate material.
  • the upper reinforcement roll chock 4-1 supports the upper reinforcement roll 2-1 disposed above the upper work roll 1-1
  • the lower reinforcement roll chock 4-2 is disposed below the lower work roll 1-2. To support the lower reinforcing roll.
  • the pair of first project blocks 5-1 and 5-2 are integrally formed so as to project inward from the housing 9.
  • the pair of first project blocks 5-1 and 5-2 includes an upper increment bending apparatus 6-1 that applies an increase bending force to the upper work roll 1-1 via the upper work roll chock 3-1. 6-2, and lower increment bending apparatuses 6-3 and 6-4 for applying an increment bending force to the lower work roll 1-2 via the lower work roll chock 3-2 are provided.
  • the upper increment bending apparatuses 6-1 and 6-2 are configured by a first hydraulic cylinder as an actuator and a piston rod (first piston rod).
  • the first hydraulic cylinder is built in the pair of first project blocks 5-1 and 5-2, and the first piston rod protrudes from the upper surface of the pair of first project blocks 5-1 and 5-2. It is provided in contact with the work roll chock 3-1.
  • the lower increase bending apparatuses 6-3 and 6-4 are configured by a second hydraulic cylinder, which is an actuator, and a piston rod (second piston rod).
  • the second hydraulic cylinder is built in the pair of first project blocks 5-1 and 5-2, and the tip of the second piston rod protrudes from the lower surface of the pair of first project blocks 5-1 and 5-2. Provided in contact with the work roll chock 3-2.
  • the rolling mill 1 has a function of applying a decrease bending force to the upper work roll 1-1 via the upper work roll chock 3-1, and the upper work roll 1-1 as the upper reinforcing roll 2.
  • -1 and 7-2 having a function of applying a pulling force (roll balance force) to be brought into contact with -1 are arranged in the upper reinforcing roll chock 4-1.
  • the upper decrease bending apparatuses 7-1 and 7-2 having the above two functions are constituted by a third hydraulic cylinder as an actuator and a piston rod (third piston rod).
  • the third hydraulic cylinder is disposed in the upper reinforcing roll chock 4-1.
  • the tip of the third piston rod has a shape that engages with the upper work roll chock 3-1.
  • the rolling mill 1 includes lower decrease bending apparatuses 7-3 and 7-4 that apply a decrease bending force to the lower work roll 1-2 via the lower work roll chock 3-2.
  • the lower decrease bending devices 7-3 and 7-4 are configured by a fourth hydraulic cylinder, which is an actuator, and a piston rod (fourth piston rod).
  • the fourth hydraulic cylinder is arranged in the lower reinforcing roll chock 4-2 or is built in a pair of second project blocks 5-3 and 5-4 described later.
  • the fourth piston rod is provided so that the tip thereof is in contact with the lower work roll chock 3-2.
  • the upper reinforcing roll chock 4-1 shown in FIG. 16 is a type of rolling mill 1E having a type that includes an arm for holding the upper work roll chock 3-1 and is often used in a thick plate finishing rolling mill. .
  • this type of rolling mill since the upper reinforcing roll chock 4-1 holds the upper working roll chock 3-1, the upper working roll 1-1 is lifted as the upper reinforcing roll 2-1 is pulled up, and a large roll The opening can be taken.
  • this rolling mill cannot take a sufficient place for installing the increment bending device and the decrease bending device for the upper work roll 1-1. Therefore, as shown in FIG. 16, normally, for the upper work roll 1-1, the small-capacity increase bending apparatuses 6-1 and 6-2 are connected to the upper reinforcement roll chock 4-1 and the upper work roll chock 3-1. The decrease bending device for the upper work roll 1-1 is not provided. Therefore, there is a drawback that the shape control capability is limited.
  • the rolling direction force acting on the upper work roll 1-1 is received by the contact surface on the downstream side in the rolling direction between the upper reinforcement roll chock 4-1 and the upper work roll chock 3-1.
  • This force is finally received at the contact surface formed by the contact surface between the outer surface of the upper reinforcing roll chock 4-1 in the rolling direction downstream arm and the inner side of the housing window 12.
  • the contact surface on the downstream side in the rolling direction has a small space, and it is difficult to provide a load cell that can sufficiently support the upper work roll chock 3-1.
  • the pair of first project blocks 5-1 and 5-2 projecting inward from the housing 9 is shifted downward with respect to the pass line. Place it at the specified position. That is, unlike the conventional method shown in FIG. 15, a pair of first project blocks 5-1 and 5-2 are arranged at positions that are vertically asymmetric with respect to the pass line. Further, regarding the shape of the upper work roll chock 3-1, the height of the portion sandwiched between the pair of first project blocks 5-1 and 5-2 is not increased, but the pair of first project blocks 5-1. The height of the base portion adjacent to the portion sandwiched between -1, 5-2, in other words, the upper portion corresponding to the width of the housing window 12 (housing window width) is increased.
  • the rolling mill 1 thereby, in the rolling mill 1 according to the present embodiment, the upper portion corresponding to the housing window width of the upper work roll chock 3-1 and the housing window positioned above the pair of first project blocks 5-1 and 5-2. 12, the rolling direction force such as offset component force acting on the upper work roll 1-1, that is, the metal plate material 10, the upper reinforcing roll 2-1 and the like is applied to the trunk of the upper work roll 1-1. Bearing the rolling direction force.
  • Lower increase bending apparatuses 6-3 and 6-4 that apply force are arranged in a pair of first project blocks 5-1 and 5-2 that protrude inside the housing 9.
  • the upper decrease bending devices 7-1 and 7-2 are constituted by a third hydraulic cylinder and its third piston rod built in the upper reinforcing roll chock 4-1. Then, the tip of the third piston rod of the third hydraulic cylinder can be connected to the upper work roll chock 3-1 by a roll axial movement operation accompanying roll exchange or the like, and a roll balance force is applied.
  • the roll opening can be increased regardless of the stroke of the increment bending apparatus, and a strong decrease bending force can be applied in cases where plate crown control with a plate thickness of about 100 mm or less is required. .
  • FIG. 2 is a sketch of the upper work roll 1-1 and the upper work roll chock 3-1, in which the front side is the drive side and the back side is the work side.
  • the cross-section reverse T where the tip of the third piston rod of the third hydraulic cylinder constituting the upper decrease bending devices 7-1 and 7-2 is fitted.
  • a letter-shaped groove 31 is formed as a first engaging portion. The groove 31 is open to the drive side and is formed to the vicinity of the center of the chock.
  • the enlarged portion of the third piston rod is inserted into the groove 31 from the groove opening on the driving side while maintaining the positional relationship where the inner surface of the groove 31 and the outer surface of the third piston rod do not contact each other. Let it enter. Thereby, engagement with the 1st engaging part and the 2nd engaging part is realized.
  • FIG. 3A is a view showing a state in which the enlarged portion formed at the tip of the third piston rod of the third hydraulic cylinder of the upper decrease bending devices 7-1 and 7-2 is engaged with the groove 31.
  • FIG. 3A shows that the third piston rod is pulled upward by the pulling operation of the third hydraulic cylinder and abuts on the upper surface of the groove 31 of the upper work roll chock 3-1 to apply the rising force fRB. Indicates the state.
  • the ascending force fRB acts as a roll balance force.
  • the upper work roll 1-1 is not dependent on the stroke of the first piston rod of the upper increment bending apparatuses 6-1 and 6-2 provided in the pair of first project blocks 5-1 and 5-2. Can be raised together with the upper reinforcing roll 2-1. Therefore, a large roll opening can be taken without difficulty.
  • FIG. 3B is a diagram illustrating a state in which an upper decrease bending force is applied in the case of performing sheet crown / shape control such as finish rolling of thin sheet hot rolling. That is, by the third hydraulic cylinders of the upper decrease bending devices 7-1 and 7-2, the third piston rod extends downward, and the pressing force fDC is applied to the bottom surface of the groove 31 of the upper work roll chock 3-1. By doing so, it gives the decrease bending power.
  • FIG. 3C is a diagram showing a non-contact state when the groove 31 and the third piston rod are engaged with each other and when the engagement is released as described above.
  • the groove 31 is formed in the upper work roll chock 3-1, and the enlarged portion that engages with the groove 31 is formed in the upper decrease bending apparatuses 7-1 and 7-2.
  • the groove 31 is formed in the upper decrease bending apparatuses 7-1 and 7-2, and the enlarged portion that engages with the groove 31 is formed in the upper work roll chock 3-1. Also good.
  • the rolling direction force applied to the body portion of the lower work roll 1-2 is the lower work roll chock 3-2 and the project block (5-1 or 5) provided on the exit side. It is borne by the contact surface with 5-2). Therefore, in the rolling mill 1 according to this embodiment shown in FIG. 1, the height of the portion sandwiched between the pair of first project blocks 5-1 and 5-2 of the lower work roll chock 3-2 is increased.
  • the roll opening is adjusted mainly by moving the upper work roll chock 3-1 up and down, the vertical movement amount of the lower work roll chock 3-2 is small. Therefore, the posture of the lower work roll 1-2 does not become unstable as the roll opening increases.
  • FIG. 4 is a plan sectional view showing an arrangement example of the upper and lower increase bending apparatuses 6-1 to 6-4. That is, it is a cross-sectional view of the pair of first project blocks 5-1 and 5-2 at the pass line height.
  • the upper and lower increase bending apparatuses 6-1 to 6-4 are arranged so as to be shifted from each other on the plan sectional view of the pair of first project blocks 5-1, 5-2. It is desirable.
  • the upper increment bending apparatuses 6-1 and 6-2 and the lower increment bending apparatuses 6-3 and 6-4 are shifted in the axial direction of the work roll 1-2. It is desirable to deploy in a relationship.
  • the upper and lower increase bending apparatuses 6-1 to 6-4 do not interfere with each other in each of the pair of first project blocks 5-1 and 5-2. That is, the first hydraulic cylinder and the second hydraulic cylinder built in each of the first project blocks 5-1 and 5-2 do not interfere with each other. For this reason, the capacity of the first hydraulic cylinder and the second hydraulic cylinder can be increased, and the strokes of the first piston rod and the second piston rod can be increased to increase the increment bending operation amount.
  • the lower increment bending devices 6-3 and 6-4 are each constituted by two second hydraulic cylinders on the inlet side and the outlet side.
  • the same action and effect can be obtained also by arranging one second hydraulic cylinder and one lower hydraulic cylinder 1-2 at different positions so as not to interfere with the first hydraulic cylinder.
  • FIG. 5 is also a plan sectional view showing an arrangement example of the upper and lower increase bending apparatuses 6-1 to 6-4. That is, it is a cross-sectional view of the pair of first project blocks 5-1 and 5-2 at the pass line height.
  • the first hydraulic cylinder and the second hydraulic cylinder may be in a positional relationship shifted in the rolling direction. Even in such an arrangement, the first hydraulic cylinder and the second hydraulic cylinder do not interfere with each other. For this reason, it is possible to increase the bending operation amount by increasing the capacities of the first hydraulic cylinder and the second hydraulic cylinder and increasing the strokes of the first piston rod and the second piston rod. So far, the structure of the rolling mill 1 according to the present embodiment has been described mainly from the viewpoint of obtaining a large roll opening, which is one of the problems to be solved.
  • a large capacity is provided from the housing 9 of the rolling mill 1 to the pair of first project blocks 5-1 and 5-2 projecting inward.
  • a large stroke upper increment bending device 6-1 or 6-2 can be provided.
  • the upper reinforcing roll chock 4-1 does not include the arm portions as in the rolling mills 1A and 1B shown in FIGS. For this reason, large-capacity and large-stroke upper decrease bending devices 7-1 and 7-2 can be installed at positions where they do not interfere with the bearings of the upper reinforcing roll 2-1 of the upper reinforcing roll chock 4-1. Thus, a large decrease bending force can be applied to the upper work roll 1-1.
  • each of the increment bending apparatuses 6-1 to 6-4 can be connected to each hydraulic control valve via a fixed hydraulic pipe and employs a servo valve for high response hydraulic control. be able to. Therefore, it is possible to provide an incremental bending apparatus with high responsiveness.
  • FIG. 6 is a side view showing a rolling mill 1 ′ according to a modification of the present embodiment.
  • the upper roll system has the same configuration as that in FIG. 1, but the lower roll system has a different configuration.
  • lower decrease bending apparatuses 7-3 and 7-4 that apply a decrease bending force to the lower work roll 1-2 are provided in the lower reinforcing roll chock 4-2.
  • the lower decrease bending apparatuses 7-3 and 7-4 are arranged below the pair of first project blocks 5-1 and 5-2. Deployed in blocks 5-3 and 5-4.
  • the response of the roll bending device is less than when the fixed piping and servo valves are used. It must be lowered.
  • the decrease bending force cannot be applied during idling when no rolling load is applied. Therefore, when applying the decrease bending force, it is necessary to quickly set the decrease bending force from the idle state where the roll balance force is taken to 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 by controlling the decrease bending device with poor responsiveness, a predetermined defect bending force may not be applied at the leading and trailing ends of the rolled material, and the shape defect portion may become long. There is.
  • the rolling method according to this embodiment solves the above problem. That is, a rolling method using the rolling mills 1 and 1 ′ according to this embodiment in which the upper decrease bending apparatuses 7-1 and 7-2 are arranged in the upper reinforcing roll chock 4-1, It is a rolling method that solves the above-mentioned problems that may occur. As described above, in the rolling mills 1 and 1 ′ in which the upper decrease bending apparatuses 7-1 and 7-2 are provided in the upper reinforcing roll chock 4-1, the response of the decrease bending apparatus may be deteriorated.
  • the upper increment bending apparatuses 6-1, 6- are provided on the pair of first project blocks 5-1, 5-2 projecting inward from the housing 9. 2 is a structure in which a large capacity and large stroke upper increment bending apparatus can be obtained.
  • the rolling method according to the present embodiment has a high responsiveness in changing the roll bending force at the start of rolling and at the end of rolling when the decrease bending force is applied to the work roll for the purpose of plate crown and shape control. This is performed by using an increment bending apparatus to compensate for the responsiveness of the decrease bending apparatus.
  • FIG. 7 is a diagram illustrating an example of an operation flow of the rolling method according to the present embodiment. That is, it is a diagram showing an operation flow of an increase bending device having a high response and a decrease bending device having a slightly lower response than the above.
  • FIG. 8 shows time-series changes such as roll bending force for one rolled material in this rolling method.
  • FIG. 8 shows, from above, 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, which is the resultant force.
  • FIGS. 8 shows time-series changes such as roll bending force for one rolled material in this rolling method.
  • FIG. 8 shows, from above, 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, which is the resultant force.
  • the set value FR of the work roll bending force during rolling corresponding to the rolled material to be rolled next is calculated and obtained.
  • FR is a negative value, that is, calculated as a decrease bending force.
  • the increase bending force force in the increase direction (direction in which the roll R is opened)
  • the decrease bending force force in the decrease direction (direction in which the roll is pressed)
  • the roll balance force FB is determined as a force that prevents the work roll driven by the electric motor and the follower reinforcing roll from slipping even in the idling state.
  • the DB may be set with a minimum hydraulic pressure such that the actuator of the decrease bending apparatus does not leave the work roll chock.
  • DS and IS are simultaneously output so that the roll balance force FB is constant.
  • IR is the output of the increment bending apparatus during rolling, and a value close to the minimum controllable value is determined in advance so that the absolute value of DS does not become excessive.
  • the increase bending force is changed (decreased) while maintaining the constant bending force at a constant value so that the predetermined work roll bending force FR during the rolling acts on the work roll chock as a resultant force.
  • the output of the increment bending apparatus is changed from IS to IR.
  • the output of the slow bending device which has a slow response, remains DS, and the work roll bending force as a resultant force is rolled from the roll balance force FB (> 0) by controlling the fast responding increase bending device.
  • the work can be quickly switched to the roll bending force FR ( ⁇ 0).
  • the rolling start time (b) refers to the time point when the rolling is started, and the detection is performed, for example, when the load detected by the load cell for measuring the rolling load of the rolling mills 1 and 1 ′ is 30% of the expected rolling load. It can be decided by the method when it exceeds.
  • the end of rolling (c) refers to the end of rolling, and for example, the load detected by the load cell for measuring the rolling load of the rolling mills 1 and 1 ′ is 50% of the average value of the actual rolling load. It can be determined by the method of timing below.
  • 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, even if it is necessary to deploy a decrease bending device having a relatively low response, a highly responsive increase bending device compensates for this.
  • a 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.
  • the rolling method according to the present embodiment it is possible to build a good plate crown and shape against disturbances that vary during rolling, such as the rolled material entry side plate thickness and the rolled material temperature. Thereby, product quality and yield can be greatly improved.
  • FIG. 9 is a diagram showing a time series change of the roll bending force and the like when the response of the decrease bending apparatus is extremely low (particularly when it has a hydraulic characteristic in which the pressure decreases when the reaction force is released).
  • FIG. 8 according to the operation flow of the increment bending apparatus and the decrease bending apparatus shown in FIG. 7, changes in time series such as a roll bending force accompanying a rolling operation on a single rolled material are shown. That is, an example in which the response speed of the decrease bending apparatus is slower than in the cases of FIGS.
  • the output of the increase bending apparatus with high responsiveness changes abruptly, so the output of the decrease bending apparatus with poor responsiveness fluctuates.
  • the work roll bending force as the resultant force can be sent to reach FR at timing b, and it can be delayed to reach FB at timing c.
  • the rolling method shown in FIG. 10 solves this problem.
  • FIG. 10 is a diagram showing an operation flow in the case of having an increase bending device with high responsiveness and a decrease bending device with low responsiveness.
  • FIG. 11 shows time-series changes such as roll bending force for one rolled material in this rolling method.
  • FIG. 11 shows the rolling load, the output of the increment bending apparatus, the output of the decrease bending apparatus, and the time series change of the work roll bending force, which is the resultant force, from the top.
  • FIGS a description will be given with reference to FIGS.
  • the decrease bending force or the hydraulic pressure in the hydraulic piping connected to the decrease bending apparatus is constantly measured by a load cell installed in the decrease bending apparatus, and the increment bending apparatus is based on the measured value. Dynamic control.
  • the output of the increment bending apparatus is controlled according to the decrease bending force or the hydraulic pressure of the decrease bending apparatus so that the work roll bending force becomes the roll balance force FB before and after rolling.
  • control other than this is the same as that of the rolling method shown in FIG. 7, it demonstrates concretely below.
  • the set value FR of the work roll bending force during rolling corresponding to the rolled material to be rolled next is calculated and obtained.
  • 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 FB is applied to the work roll chock as a resultant force. That is, at idle before rolling, the increment bending apparatus output is IB (> 0), the decrease bending apparatus output is DB ( ⁇ 0), and IB + DB acts as the roll balance force FB (> 0).
  • the increase bending force is changed (decreased) while maintaining the constant bending force at a constant value so that the predetermined work roll bending force FR during the rolling acts on the work roll chock as a resultant force.
  • the output of the increment bending apparatus is changed from IS to IR.
  • the output of the slow bending device which has a slow response, remains DS, and the work roll bending force as a resultant force is rolled from the roll balance force FB (> 0) by controlling the fast responding increase bending device.
  • the work can be quickly switched to the roll bending force FR ( ⁇ 0).
  • the time when 1 to 3 seconds elapse from the end of rolling (c) is the work completion timing (point d on the time axis).
  • the output of the increment bending apparatus is set to IB, and the decrease bending apparatus. Change the output to DB.
  • the increment bending is performed so that the roll balance force FB that can be slightly changed is always constant.
  • the device output IS is controlled and output simultaneously with the DS.
  • the increase bending device compensates for the fluctuation of the output of the decrease bending device, and the work roll bending force is optimized and high-response control is performed. Can be realized.
  • a metal plate material rolling mill having a pair of upper and lower work rolls and a pair of upper and lower reinforcing rolls that respectively support the work rolls, and a hydraulic cylinder that applies an incremental bending force to each of the upper and lower work rolls.
  • a rolling mill housing disposed in a project block projecting inwardly, and having a rolling direction force acting on the lower work roll supported by the project block, and a rolling direction force acting on the upper work roll being located above the project block
  • a double-acting hydraulic cylinder that is supported by the window and gives the upper work roll decrease bending force is installed in the upper reinforcement roll chock, and its piston tip is connected to the upper work roll chock, and the upper reinforcement roll and the upper work Roll balance output that keeps the roll in contact Rolling mill of the metal plate having.
  • a hydraulic cylinder that applies an increase bending force to the upper work roll and a hydraulic cylinder that applies an increase bending force to the lower work roll are arranged at different positions on the plan view in the project block. May be.
  • a hydraulic cylinder for applying a decrease bending force to the lower work roll may be provided in the lower reinforcing roll chock or the second project block located below the project block.
  • the piston tip cross-section of the hydraulic cylinder that imparts the upper work roll decrease bending force has an enlarged portion, and the upper work roll chock has the enlarged portion moved by moving in the roll axial direction when the upper work roll is replaced.
  • the recessed part to engage may be formed.
  • the increase bending force is changed so that the combined force of the decrease bending force and the increase bending force maintains the roll balance force. Then, at the start of rolling, the increase bending force is changed as the resultant force while continuing the control of maintaining the decrease bending force during the predetermined rolling while maintaining the predetermined bending force during the rolling.
  • Work roll chock During the rolling, the rolling is performed so as to maintain the predetermined work roll bending force during the rolling, and then the incremental bending force is changed at the end of rolling, and the resultant roll is combined with the decrease bending force.
  • the roll bending force corresponding to the balance force is applied to the work roll chock, and the rolling of the metal plate material is finished in this state, and then the decrease bending force and the increase bending force are maintained so as to maintain the roll balance force as the resultant force.
  • a method for rolling a metal sheet wherein In this metal sheet rolling method, the hydraulic pressure in the hydraulic cylinder that generates the decrease bending force or in the hydraulic piping connected to the hydraulic cylinder is measured, and based on the measured value, the roll bending force acting on the work roll chock is obtained as a resultant force.
  • the increase bending force may be controlled to be a predetermined value.
  • the present invention relates to rolling of steel sheets, particularly as a reverse rolling mill that requires a large opening, and as a rolling mill that requires strong sheet crown and shape control, rolling mills ranging from extremely thick plate materials to thin plates. And a rolling method can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
PCT/JP2012/055515 2011-03-24 2012-03-05 金属板材の圧延機および圧延方法 WO2012128019A1 (ja)

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KR1020137013858A KR101392078B1 (ko) 2011-03-24 2012-03-05 금속 판재의 압연기 및 압연 방법
EP20120761152 EP2626149B1 (en) 2011-03-24 2012-03-05 Device for rolling metal sheet material and method for rolling metal sheet material
CN201280003946.2A CN103237609B (zh) 2011-03-24 2012-03-05 金属板材的辊轧机及轧制方法
JP2012524041A JP5059250B1 (ja) 2011-03-24 2012-03-05 金属板材の圧延機および圧延方法

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JP2011-066153 2011-03-24
JP2011066153 2011-03-24

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CN104923564B (zh) * 2014-03-21 2017-02-22 宝山钢铁股份有限公司 可避免工作辊窜动过程中轧辊脱出误报警的方法
TWI499881B (zh) * 2014-04-29 2015-09-11 China Steel Corp Method of establishing the instant compensation system of width compensation and its database
JP7313768B2 (ja) * 2019-05-23 2023-07-25 スチールプランテック株式会社 圧延機、並びに圧延方法及びワークロールの運用方法
WO2021205548A1 (ja) * 2020-04-07 2021-10-14 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ 株式会社 圧延機、圧延機の製造方法、および圧延機の改造方法
CN113787095B (zh) * 2021-09-03 2024-05-03 太原理工大学 一种可施加水平振动的金属复合板轧制装置

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EP2626149A4 (en) 2014-03-05
KR101392078B1 (ko) 2014-05-07
KR20130069875A (ko) 2013-06-26
TWI496630B (zh) 2015-08-21
EP2626149B1 (en) 2015-04-29
TW201304886A (zh) 2013-02-01
CN103237609A (zh) 2013-08-07
JPWO2012128019A1 (ja) 2014-07-24
EP2626149A1 (en) 2013-08-14
CN103237609B (zh) 2014-05-28
JP5059250B1 (ja) 2012-10-24

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