EP4019156A1 - Walzwerk, verfahren zur herstellung eines walzwerks und verfahren zur änderung des walzwerks - Google Patents

Walzwerk, verfahren zur herstellung eines walzwerks und verfahren zur änderung des walzwerks Download PDF

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Publication number
EP4019156A1
EP4019156A1 EP20930355.1A EP20930355A EP4019156A1 EP 4019156 A1 EP4019156 A1 EP 4019156A1 EP 20930355 A EP20930355 A EP 20930355A EP 4019156 A1 EP4019156 A1 EP 4019156A1
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EP
European Patent Office
Prior art keywords
roll
cylinder
bending
work
rolling mill
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP20930355.1A
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English (en)
French (fr)
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EP4019156B1 (de
EP4019156A4 (de
Inventor
Kenji Horii
Akio Kuroda
Tatsunori Sugimoto
Akira Sako
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Primetals Technologies Japan Ltd
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Primetals Technologies Japan Ltd
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Publication of EP4019156A1 publication Critical patent/EP4019156A1/de
Publication of EP4019156A4 publication Critical patent/EP4019156A4/de
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Publication of EP4019156B1 publication Critical patent/EP4019156B1/de
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Classifications

    • 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
    • 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
    • B21B13/142—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 by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/04—Work roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/12—Axial shifting the rolls
    • B21B2269/14—Work rolls
    • 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

Definitions

  • the present invention relates to a rolling mill, a manufacturing method for a rolling mill, and a modification method for a rolling mill.
  • Patent Document 1 states that a fixed guide block is fixed on both sides in a window of each roll stand at the same level as roll inserts, the force of bending cylinders is transmitted to the roll inserts which are guided axially in a vertically displaceable manner, the lengths of the bending cylinders on upper and lower piston ends are larger than the respective widths thereof, and the longitudinal axes of the bending cylinders extend in the direction of axial displacement of the rolls.
  • Patent Document 2 states that the bending device has guide blocks disposed in lateral roll uprights for each of two vertically adjustable pressure transmission elements on which the work rolls are supported via inserts, two bending cylinders each of which is disposed between the pressure transmission elements and has a piston rod which acts on a pressure transmission element, and a cylinder formed by the respective other pressure transmission element, and that, in order to provide advantageous design conditions, the L-shaped pressure transmission elements have a longer, vertical limb and a shorter, horizontal limb, the limbs of the pressure transmission elements are disposed opposite each other in pairs in a plane parallel to the work rolls, and the longer limbs of the pressure transmission elements are mounted in vertical guides in the respective guide block and accommodate a cylinder of the bending cylinders, whose piston rods act on the shorter limbs of the respective other pressure transmission element.
  • a rolling mill that has a shift function of causing rolling rolls to be displaced in roll axis directions and a bending function of causing pressurizing forces to act on bearings of the rolls in directions perpendicular to the axes, to thereby control the shape of a rolled material by using associated action of displacement of the rolls and bending forces of the rolls.
  • Patent Documents 1 and 2 There are known technologies for suppressing such offset loads that act on bearings and extending the lifetime of the bearings, and, for example, there are technologies described in Patent Documents 1 and 2.
  • an upper case and a lower piston case are disposed and are pressed by a piston, thereby making it possible to cause bending forces to act on a bearing housing.
  • Careful consideration is given to a pendulum support disposed between the piston, the upper case, and the lower piston case such that the moment is prevented from acting on the piston.
  • Patent Document 2 discloses a structure in which vertical limbs and horizontal limbs having bending cylinders disposed therein slide in vertical guides to thereby cause bending forces to act on inserts. Thereby, a moment generated to the bending device due to the shifting of rolls can be received, and bending forces are caused to act on substantially the center of a bearing.
  • a horizontal backlash (gap) is generated in a roll bearing housing in some cases.
  • it is effective to dispose backlash elimination cylinders that apply forces in a rolling direction to bearings.
  • the present invention provides a rolling mill in which backlash elimination cylinders can be disposed without size increases of devices as compared to conventional devices, and a manufacturing method and a modification method for such a rolling mill.
  • the present invention includes a plurality means for solving the problems described above, and there is provided as an example thereof a rolling mill including a roll that is shifted in an axial direction, a bearing that is shifted in a roll-axis direction along with the roll, and receives a load from the roll, and first cylinders that apply bending force vertically to the bearing housing to cause the roll to perform bending.
  • the rolling mill further includes a second cylinder that apply a pressing force in a rolling direction to the bearing housing, and a member that is disposed between one of the first cylinders and the bearing housing and receives a bending force from the first cylinder. Another one of the first cylinders and the second cylinder are disposed axially on one of an entry side and an exit side in the rolling direction, and the one first cylinder and the member are disposed on the other of the entry and exit sides in the rolling direction.
  • Embodiments of a rolling mill, a manufacturing method for a rolling mill, and a modification method for a rolling mill according to the present invention are explained below with reference to the figures. Note that identical or corresponding constituent elements in the figures used in the present specification are denoted by identical or similar reference characters, and repetitive explanations regarding these constituent elements are omitted in some cases.
  • FIG. 2 is a figure illustrating an overview of a rolling facility including rolling mills according to the first embodiment of the present invention
  • FIG. 3 is a front view for explaining an overview of a rolling mill
  • FIG. 4 is a cross-sectional view taken along A-A' in FIG. 3
  • FIG. 5 is a cross-sectional view taken along B-B' in FIG. 3
  • FIG. 6 is a cross-sectional view taken along C-C' in FIG. 3
  • FIG. 7 is a plan view for explaining details of a work roll portion.
  • a rolling facility 1 includes a plurality of rolling mills that perform hot rolling of a rolled material 5 into a strip.
  • the rolling facility 1 has a controller 80 and seven stands which are a first stand 10, a second stand 20, a third stand 30, a fourth stand 40, a fifth stand 50, a sixth stand 60 and a seventh stand 70 from a rolled material 5 entry side.
  • each of the first stand 10, the second stand 20, the third stand 30, the fourth stand 40, the fifth stand 50, the sixth stand 60, and the seventh stand 70 and a portion of the controller 80 that controls the corresponding stand correspond to what is called a rolling mill in the present invention.
  • the rolling facility 1 is not limited to a rolling facility including seven stands like the one illustrated in FIG. 2 and can be a rolling facility including at least two stands.
  • FIG. 3 part of the overview of a rolling mill according to the present invention is explained with reference to FIG. 3 .
  • the rolling mill according to the present invention can be applied to any one of the first stand 10, the second stand 20, the third stand 30, the fourth stand 40, the fifth stand 50, and the sixth stand 60 illustrated in FIG. 2 .
  • the seventh stand 70 which is a rolling mill according to the present embodiment, is a rolling mill including four rolls that rolls the rolled material 5, and has housings 700, the controller 80, and a hydraulic device (illustration omitted).
  • the housings 700 include an upper work roll 710 and a lower work roll 711, and an upper backup roll 730 and a lower backup roll 731 that support the upper work roll 710 and the lower work roll 711 by making contact with the upper work roll 710 and the lower work roll 711, respectively.
  • a bearing 790 (see FIG. 7 ) that is shiftable in a roll axis direction along with the upper work roll 710 and receives a load from the roll is disposed at an axial end portion of the upper work roll 710, and the bearings 790 are supported by upper-work-roll bearing housings 712.
  • a bearing (omitted for the convenience of illustration) is disposed at an axial end portion of the lower work roll 711, and the bearings are supported by lower-work-roll bearing housings 713.
  • the upper work roll 710 is configured to be shiftable in the roll axis direction with use of a shift cylinder 715 like the one illustrated in FIG. 4 via the work-side upper-work-roll bearing housing 712.
  • the lower work roll 711 is also configured to be shiftable in the roll axis direction with use of a shift cylinder 716 like the one illustrated in FIG. 4 via the work-side lower-work-roll bearing housing 713.
  • an entry-side fixation member 702 is fixed to the rolled material 5 entry-side housing 700.
  • An exit-side fixation member 703 is fixed to the rolled material 5 exit-side housing 700 such that the exit-side fixation member 703 faces the entry-side fixation member 702.
  • upper-work-roll bending cylinders 740 disposed in the entry-side fixation member 702 and a work-roll bending cylinder 741 disposed in the exit-side fixation member 703 support the upper-work-roll bearing housing 712, and, by driving these cylinders as appropriate, it becomes possible to apply bending forces vertically to the bearings of the upper work roll 710 and cause the upper work roll 710 to perform bending.
  • lower-work-roll bending cylinders 744 disposed in the entry-side fixation member 702 and the work-roll bending cylinder 741 disposed in the exit-side fixation member 703 mentioned above support the lower-work-roll bearing housing 713, and, by driving these cylinders as appropriate, it becomes possible to apply bending forces vertically to the bearings of the lower work roll 711 and cause the lower work roll 711 to perform bending.
  • the upper-work-roll bending cylinders 740 and the work-roll bending cylinder 741 are disposed such that bending forces are applied to the bearings of the upper work roll 710 that makes contact with the rolled material 5 toward a vertical increase side (away from the rolled material) to cause the upper work roll 710 to perform bending (first cylinders).
  • the lower-work-roll bending cylinders 744 and the work-roll bending cylinder 741 are disposed such that bending forces are applied to the bearings of the lower work roll 711 that makes contact with the rolled material 5 toward the vertical increase side to cause the lower work roll 711 to perform bending (first cylinders).
  • an upper-work-roll bearing-housing backlash elimination cylinder 760 is disposed such that a horizontal force, specifically, a pressing force in the rolling direction, is applied to the upper work roll 710 via a liner (illustration omitted) of the upper-work-roll bearing housing 712 (second cylinder).
  • a lower-work-roll bearing-housing backlash elimination cylinder 762 is disposed such that a pressing force is applied to the lower work roll 711 in the rolling direction via a liner of the lower-work-roll bearing housing 713 (second cylinder).
  • a bearing (illustration omitted) is disposed at an axial end portion of the upper backup roll 730, and these bearings are supported by upper-backup roll bearing housings 732.
  • a bearing (illustration omitted) is disposed at an axial end portion of the lower backup roll 731, and these bearings are supported by lower-backup roll bearing housings 733.
  • upper-backup roll bearing-housing backlash elimination cylinders 780 are disposed such that horizontal forces are applied to the upper backup roll 730 via the upper-backup roll bearing housings 732.
  • lower-backup roll bearing-housing backlash elimination cylinders 782 are disposed such that horizontal forces are applied to the lower backup roll 731 via the lower-backup roll bearing housings 733.
  • the hydraulic device is connected to hydraulic cylinders such as the bending cylinders, the backlash elimination cylinders, or the shift cylinders that are mentioned above or rolling cylinders (illustration omitted) that apply roll forces for rolling the rolled material 5 to the upper work roll 710 and the lower work roll 711.
  • the hydraulic device is connected to the controller 80.
  • the controller 80 performs actuation control of the hydraulic device to supply and discharge a hydraulic fluid to and from the bending cylinders and the like mentioned above, to thereby perform drive control of the respective cylinders.
  • the lower work roll 711 also can have configurations equivalent to those of the upper work roll 710. Their configurational details are substantially the same as those of the upper work roll 710, and thus, explanations thereof are omitted.
  • two upper-work-roll bending cylinders 740 are disposed in the roll axis direction on the rolled material 5 entry side.
  • the upper-work-roll bearing-housing backlash elimination cylinder 760 is disposed between the two upper-work-roll bending cylinders 740. That is, on the entry side in the rolling direction, the upper-work-roll bending cylinder 740, the upper-work-roll bearing-housing backlash elimination cylinder 760, and the upper-work-roll bending cylinder 740 are disposed axially in this order.
  • the work-roll bending cylinder 741 is disposed on the rolled material 5 exit side.
  • the work-roll bending cylinder 741 is disposed to be positioned between the two upper-work-roll bending cylinders 740 disposed on the entry side when seen in the rolling direction and, more suitably, is disposed such that the axial position of the work-roll bending cylinder 741 coincides with the axial position of the upper-work-roll bearing-housing backlash elimination cylinder 760 on the rolled material 5 entry side.
  • members 712A and 713A that are disposed between the work-roll bending cylinder 741 and the respective bearing housings 712 and 713 and receive bending forces from the work-roll bending cylinder 741 are disposed on the rolled material 5 exit side.
  • the members 712A and 713A are configured to be at least partially, more suitably entirely, axially shiftable along with the respective bearing housings 712 and 713. Further, it is desirable that the members 712A and 713A are configured such that the axial positions thereof are shiftable between the two bending cylinders 740 when seen from the entry or exit side in the rolling direction.
  • the members 712A and 713A each have therein a portion whose horizontal cross-sectional area is larger on the side of the bearing housing 712 or 713 than on the side of the bending cylinder 741, and as illustrated in FIG. 6 , it is desirable that the members 712A and 713A each have a protruding shape whose cross-sectional area is smaller on the side of the work-roll bending cylinder 741.
  • the members 712A and 713A each have therein a portion whose axial length is longer on the side of the bearing housing 712 or 713 than on the side of the bending cylinder 741.
  • the shapes of the members 712A and 713A in the rolling direction are not limited particularly, it is desirable that the members 712A and 713A each have a protruding shape, as illustrated in FIG. 6 , whose cross-sectional area is smaller on the side of the work-roll bending cylinder 741, taking into consideration their roles of effectively transmitting bending forces from the work-roll bending cylinder 741 to the bearing housings 712 and 713.
  • FIG. 6 illustrates the case where the members 712A and 713A are formed separately from the respective bearing housings 712 and 713, it is also possible to provide configurations equivalent to the members 712A and 713A integrally at portions of the bearing housings 712 and 713 where the bearing housings 712 and 713 make contact with the work-roll bending cylinder 741. This similarly applies also to each embodiment to be described later.
  • the shapes of the members 712A and 713A are also not limited to the forms illustrated in FIG. 6 , and the members 712A and 713A can adopt various other shapes such as a simple rectangular parallelepiped shape. This similarly applies also to other embodiments.
  • an axial center position of the bearing 790 that supports the work roll 710 is disposed between two upper-work-roll bending cylinder 740,e1 and upper-work-roll bending cylinder 740,e2 disposed on the entry side, and when bending of the work roll 710 is performed, the two upper-work-roll bending cylinder 740,e1 and upper-work-roll bending cylinder 740,e2 disposed on the entry side are driven, and also the work-roll bending cylinder 741 disposed on the exit side is driven.
  • a difference between a total output force of the two upper-work-roll bending cylinder 740,e1 and upper-work-roll bending cylinder 740,e2 disposed on the entry side and an output force of the work-roll bending cylinder 741 disposed on the exit side is kept within a predetermined range.
  • the resultant force of the roll bending cylinders is caused to act on a roll axis line.
  • output forces of the upper-work-roll bending cylinder 740,e1 and the upper-work-roll bending cylinder 740,e2 are the same, and that the resultant force of the bending cylinder 740,e1 and the bending cylinder 740,e2 and the output force of the work-roll bending cylinder 741, which corresponds to a bearing-center-pressing bending-force applying device, on the exit side act as the total of entry-side and exit-side bending forces on the bearing housing 712 in the vicinity of the roll axis line in a pass direction.
  • the position on which the total of entry-side and exit-side bending forces acts can be set within a range of 0 to L1/2 ⁇ Ls/4, and thus, significant deterioration of the lifetime of the bearing 790 can be suppressed.
  • the upper-work-roll bearing-housing backlash elimination cylinder 760 is positioned at the middle of the section Ls and can press substantially the center of the possible position of the center of the bearing 790 when the bearing 790 shifts, so that an output force of the upper-work-roll bearing-housing backlash elimination cylinder 760 can be suppressed not to become excessively high. That is, a size increase of the upper-work-roll bearing-housing backlash elimination cylinder 760 can be suppressed, leading to an advantage that it becomes possible to accommodate the upper-work-roll bearing-housing backlash elimination cylinder 760 in the entry-side fixation member 702 more easily.
  • the output forces of the two upper-work-roll bending cylinders 740 disposed on the entry side can be made different from each other, and can have different values as shown in Table 1 below.
  • the upper-work-roll bending cylinder 740,e1 on the axially outer side is driven with an output force obtained by multiplying an entry-side bending force Pbe by a predetermined coefficient ae1.
  • the upper-work-roll bending cylinder 740,e2 is driven with an output force obtained by multiplying the entry-side bending force Pbe by a predetermined coefficient ae2.
  • the work-roll bending cylinder 741 is driven with an output force Pbd.
  • Pbe the resultant force
  • the upper-work-roll bearing-housing backlash elimination cylinder 760 is driven with the same output force Pg1.
  • each mechanism included in the rolling mill and described with reference to FIG. 3 to FIG. 7 is prepared.
  • Each mechanism can be prepared by various methods as appropriate according to the specifications.
  • the prepared mechanisms are assembled.
  • the upper-work-roll bending cylinders 740, the lower-work-roll bending cylinders 744, and the upper-work-roll bearing-housing backlash elimination cylinder 760 and lower-work-roll bearing-housing backlash elimination cylinder 762 that apply pressing forces in the rolling direction to the bearing housings 712 and 713 are disposed axially on the entry side in the rolling direction.
  • the work-roll bending cylinder 741 is disposed, and the members 712A and 713A that receive bending forces from the work-roll bending cylinder 741 are disposed between the work-roll bending cylinder 741 and the respective bearing housings 712 and 713.
  • a rolling mill as described in Patent Documents 1 and 2 above is adopted as an existing rolling mill, the rolling mill including an axially shiftable work roll, bearing housings that are shiftable along with the work roll and receive loads from the work roll, and bearing-center-pressing bending-force applying devices (bending devices) that apply bending forces vertically to the bearing housings to thereby cause the work roll to perform bending on the entry and exit sides of the rolling method
  • existing rolling mills are not limited to this.
  • the bearing-center-pressing bending-force applying device on either one of the entry and exit sides in the rolling direction is removed from the rolling mill.
  • the bearing-center-pressing bending-force applying device on the opposite side to the side where the new bending device is or is to be attached can be removed from the rolling mill, and also, at the place where this bearing-center-pressing bending-force applying device has been removed, a backlash elimination bending device having the bending cylinders 740 and the backlash elimination cylinder 760 can be attached.
  • Parts to be replaced at the time of the removal and attachment are not limited only to bending devices, and modification can also be performed for various types of members such as lines for supplying a hydraulic fluid to cylinders in the bending devices, the entry-side fixation member 702 and the exit-side fixation member 703 around the bending devices, the controller 80, control programs, or wires for control.
  • the rolling mill according to the first embodiment of the present invention described above includes the members 712A and 713A that are disposed between the bending cylinder 741 and the respective bearing housings 712 and 713 and receive bending forces from the bending cylinder 741, the bending cylinders 740 and 744 and the backlash elimination cylinder 760 are disposed axially on one of the entry and exit sides in the rolling direction, and the bending cylinder 741 and the members 712A and 713A are disposed on the other of the entry and exit sides in the rolling direction.
  • Such a structure provides an advantage that, even in a case where a bending device like a bearing-center-pressing bending-force applying device that is likely to have a larger size is included, it is possible to dispose a backlash elimination cylinder that solves a horizontal backlash (gap) of a roll bearing housing generated during rolling, without causing a size increase of the device.
  • the members 712A and 713A are configured to be, at least partially, axially shiftable along with the bearing housings 712 and 713.
  • the members 712A and 713A receive bending forces from the bending cylinder and cause the bending forces to effectively act on the bearing housings 712 and 713, and thus, the positions of the members 712A and 713A influence the positions of the bearing housings 712 and 713 on which the bending forces act.
  • the members 712A and 713B are shiftable along with the bearing housings 712 and 713 that are displaced along with roll shifting, the displacement of the members 712A and 713B and the displacement of the bearing housings 712 and 713 are synchronized, so that it is possible to make it easier to cause the bending forces to act on desired positions of the bearing housings 712 and 713, without being influenced by the roll shifting. Accordingly, it is possible to make it much easier to cause the bending forces to act on the center of the bearing 790.
  • the members 712A and 713A each have therein a portion whose horizontal cross-sectional area is larger on the side of the bearing housing 712 or 713 than on the side of the work-roll bending cylinder 741, it can be suppressed that the bending forces from the bending cylinder act locally on the bearing housings 712 and 713, particularly on flange portions of the bearing housings 712 and 713. Accordingly, it is possible to make it unlikely for the bearing housings 712 and 713 to be damaged, and the lifetime of the bearing housings 712 and 713 can be extended.
  • the members 712A and 713A each have therein a portion whose axial length is longer on the side of the bearing housing 712 or 713 than on the side of the work-roll bending cylinder 741, it can be suppressed that the bending forces act locally on the bearing housings 712 and 713, particularly on flange portions of the bearing housings 712 and 713.
  • the members 712A and 713A are shiftable along with the bearing housings 712 and 713, it is necessary to secure in the members 712A and 713A large areas for allowing the bending forces to act, and this influences the size of the structure around the first cylinder. In this sense, by making the axial length shorter on the side of the first cylinder, a size increase of the structure around the first cylinder can be suppressed, leading to an advantage that a size increase of the bending device can be suppressed more easily.
  • the two bending cylinders 740 and the one backlash elimination cylinder 760 are disposed on either of the entry and exit sides in the rolling direction, and particularly, the bending cylinder 740, the backlash elimination cylinder 760, and the bending cylinder 740 are disposed axially in this order on either one of the entry and exit sides in the rolling direction.
  • the members 712A and 713A are configured such that the axial positions thereof are shiftable between the two bending cylinders 740 when seen from the entry or exit side in the rolling direction. With such configurations, the bending cylinder disposed on one side in the rolling direction can generate bending forces at least at an axial position ranging from one of the two bending cylinders to the other.
  • the controller 80 that drives the bending cylinders 740 and 741 is further included.
  • the axial center position of the bearing that supports the work roll 710 is disposed between the two bending cylinders 740 disposed on one side, and the controller 80 drives either one of the two bending cylinders 740 disposed on the one side and also drives the bending cylinder 741 disposed on the other side when bending of the work roll 710 is performed. Accordingly, it is possible to cause the resultant bending force to act on the vicinity of the bearing center with use of two bending cylinders per one bearing 790.
  • the controller 80 performs control such that the difference between the total output force of at least one bending cylinder 740 disposed on one side and the output force of the bending cylinder 741 disposed on the other side is kept within a predetermined range at the time when bending of the work roll 710 is performed. Accordingly, it is possible to cause substantially equal bending forces to act on the entry and exit sides of the bearing 790, leading to an advantage that the roll can be held stably.
  • FIG. 8 is a plan view for explaining details of a work roll portion of the rolling mill according to the present second embodiment.
  • the rolling mill has a configuration in which the two bending cylinders 740 and the one backlash elimination cylinder 760 are disposed on the entry side in the rolling direction on each of the drive and work sides of the work roll 710.
  • one bending cylinder 740 and two backlash elimination cylinders 760 are disposed on the entry side.
  • Their output forces can be made equal values, for example, but can be made different values as described later.
  • the work-roll bending cylinder 741 is disposed on the rolled material 5 exit side on each of the drive and work sides of the upper work roll 710.
  • the output forces of the two upper-work-roll bearing-housing backlash elimination cylinders 760 disposed on the entry side can be made different from each other, and can have different values as shown in Table 2 below.
  • the upper-work-roll bending cylinder 740 is driven with an output force Pbe, and the work-roll bending cylinder 741 is output with an output force Pbd.
  • a backlash elimination pressing force Pg1 of the upper-work-roll bearing-housing backlash elimination cylinder 760,g1 on the axially outer side is set to ⁇ 1 ⁇ Pg obtained by multiplying an output force Pg by a predetermined coefficient ⁇ 1
  • a backlash elimination pressing force Pg2 of the upper-work-roll bearing-housing backlash elimination cylinder 760,g2 is set to y2 ⁇ Pg obtained by multiplying the output force Pg by a predetermined coefficient ⁇ 2.
  • the configurations and operations are substantially the same as those of the rolling mill, the manufacturing method for a rolling mill, and the modification method for a rolling mill according to the first embodiment described before, and detailed explanation thereof is omitted.
  • the rolling mill, the manufacturing method for a rolling mill, and the modification method for a rolling mill according to the second embodiment of the present invention also make it possible to attain advantages substantially similar to the advantages attained by the rolling mill, the manufacturing method for a rolling mill, and the modification method for a rolling mill according to the first embodiment described before.
  • FIG. 9 is a front view for explaining an overview of a rolling mill according to the present third embodiment
  • FIG. 10 is a figure corresponding to a cross-section taken along D-D' in FIG. 9
  • FIG. 11 is a plan view for explaining details of a work roll portion.
  • an upper-work-roll bending cylinder 740A disposed in the entry-side fixation member 702 and an upper-work-roll bending cylinder 741A disposed in the exit-side fixation member 703 support the upper-work-roll bearing housing 712 on the upper side of the rolled material 5 on each of the work and drive sides.
  • the vertical positions of the upper-work-roll bending cylinder 740A and a lower-work-roll bending cylinder 744A are deviated from each other in the axial direction, and are disposed in a staggered manner.
  • the vertical positions of the upper-work-roll bearing-housing backlash elimination cylinder 760 and the lower-work-roll bearing-housing backlash elimination cylinder 762 coincide with each other.
  • a member 712B receiving a bending force from the upper-work-roll bending cylinder 740A is disposed between the upper-work-roll bending cylinder 740A and the bearing housing 712
  • a member 713B receiving a bending force from the lower-work-roll bending cylinder 744A is disposed between the lower-work-roll bending cylinder 744A and the bearing housing 713.
  • the lower-work-roll bending cylinder 744A disposed in the entry-side fixation member 702 and a lower-work-roll bending cylinder 745A disposed in the exit-side fixation member 703 mentioned above support the lower-work-roll bearing housing 713.
  • the vertical positions of the upper-work-roll bending cylinder 741A and the lower-work-roll bending cylinder 745A are deviated from each other in the axial direction, and are disposed in a staggered manner.
  • a member 712C receiving a bending force from the upper-work-roll bending cylinder 741A is disposed between the upper-work-roll bending cylinder 741A and the bearing housing 712
  • a member 713C receiving a bending force from the lower-work-roll bending cylinder 745A is disposed between the lower-work-roll bending cylinder 745A and the bearing housing 713.
  • the configurations and operations are substantially the same as those of the rolling mill, the manufacturing method for a rolling mill, and the modification method for a rolling mill according to the first embodiment described before, and detailed explanation thereof is omitted.
  • the rolling mill, the manufacturing method for a rolling mill, and the modification method for a rolling mill according to the third embodiment of the present invention also make it possible to attain advantages substantially similar to the advantages attained by the rolling mill, the manufacturing method for a rolling mill, and the modification method for a rolling mill according to the first embodiment described before.
  • the rolling mill according to the present invention can also be applied to a rolling mill including six rolls.
  • the first embodiment describes the case where the two upper-work-roll bending cylinders 740 are disposed on the entry side in the rolling direction on each of the work and drive sides, three or more bending cylinders can be disposed. Further, it is also possible to dispose two or more backlash elimination cylinders 760.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP20930355.1A 2020-04-07 2020-04-07 Walzwerk, verfahren zur herstellung eines walzwerks und verfahren zur änderung des walzwerks Active EP4019156B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/015731 WO2021205548A1 (ja) 2020-04-07 2020-04-07 圧延機、圧延機の製造方法、および圧延機の改造方法

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EP4019156A1 true EP4019156A1 (de) 2022-06-29
EP4019156A4 EP4019156A4 (de) 2022-08-31
EP4019156B1 EP4019156B1 (de) 2023-12-13

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EP (1) EP4019156B1 (de)
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JPH0615322A (ja) * 1992-07-03 1994-01-25 Sumitomo Metal Ind Ltd 熱間圧延時の板クラウン制御方法
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AT407124B (de) 1998-10-19 2000-12-27 Voest Alpine Ind Anlagen Biegevorrichtung für zwei arbeitswalzen eines walzgerüstes
CN100335189C (zh) * 2000-03-01 2007-09-05 株式会社日立制作所 轧机、轧辊轴承箱的松动消除装置
US6748782B1 (en) * 2000-03-01 2004-06-15 Hitachi, Ltd. Rolling mill, looseness eliminating device of roll bearing housing, rolling method, method of modifying rolling mill, and hot finishing tandem rolling equipment
TW501954B (en) 2000-06-30 2002-09-11 Sms Demag Ag Roll stand, especially a duo or quarto roll stand, comprising bending and balancing devices for axially displaceable rollers
JP2002066608A (ja) * 2000-08-30 2002-03-05 Hitachi Ltd 冷間圧延機及び圧延方法
JP4333231B2 (ja) * 2003-06-26 2009-09-16 Ｊｆｅスチール株式会社 圧延機および圧延方法
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EP4019156B1 (de) 2023-12-13
EP4019156A4 (de) 2022-08-31
CN114340811A (zh) 2022-04-12
WO2021205548A1 (ja) 2021-10-14

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