EP3812057A1 - Walzwerk und walzverfahren - Google Patents
Walzwerk und walzverfahren Download PDFInfo
- Publication number
- EP3812057A1 EP3812057A1 EP20202668.8A EP20202668A EP3812057A1 EP 3812057 A1 EP3812057 A1 EP 3812057A1 EP 20202668 A EP20202668 A EP 20202668A EP 3812057 A1 EP3812057 A1 EP 3812057A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinders
- roll
- work
- bearing
- cylinder
- 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
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000005452 bending Methods 0.000 claims abstract description 63
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000013000 roll bending Methods 0.000 description 116
- 239000000463 material Substances 0.000 description 27
- 230000008030 elimination Effects 0.000 description 20
- 238000003379 elimination reaction Methods 0.000 description 20
- 230000007246 mechanism Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/07—Adaptation of roll neck bearings
-
- 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
-
- 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
- B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/02—Backlash elimination
-
- 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
Definitions
- the present invention relates to a rolling mill and a rolling method.
- JP-1988-055369-B describes one example of rolling mills that can prevent occurrence of extreme offset loads on bearings and that makes it possible to extend the service life of the bearing, increase the roll shift amount, and additionally improve the capability of correcting the shape of a rolled material.
- each pressure of a plurality of bending cylinders arranged along the roll-axis direction is made adjustable. That is, for example, the hydraulic pressure of a cylinder in proximity to the lengthwise-center side of the bearing is set high, and the hydraulic pressure of a cylinder not in proximity to the lengthwise center of the bearing is set low. Thereby, the resultant force of the bending force is caused to act on the bearing at the lengthwise center of the bearing even if the acting positions of the bending force are different.
- JP-1988-055369-B describes one example of technologies for suppressing offset loads that act on bearings, and extending the lifetime of the bearings.
- each cylinder pressure can be adjusted such that the resultant force of bending force acting on a bearing acts on a middle portion of the bearing in the roll-axis direction.
- a rolling mill with a configuration like the one described in JP-1988-055369-B requires a large number of bending cylinders according to the shift of a roll and furthermore requires a large number of mechanisms for adjusting the pressing force of individual cylinders, leading to an increase in the number of parts and to complexity of control. Accordingly, there is room for improvement in terms of the simplification of structures and control.
- the present invention provides a rolling mill and a rolling method capable of reducing offset loads on bearings even with a simple structure as compared to conventional technologies.
- the present invention includes a plurality of means for solving the problem described above and by way of example, includes: a roll that is shifted in an axial direction; a bearing and four or more first cylinders that are provided on each of a drive side and a work side, the bearing being configured to be shifted in the axial direction of the roll along with the roll and to receive a load from the roll, the four or more first cylinders being configured to apply bending force vertically to the bearing and to cause the roll to perform bending; and a controller that drives the first cylinders, in which, on each of the drive side and the work side, two or more first cylinders in the first cylinders are provided on each of an entry side and an exit side in a rolling direction, the two or more first cylinders being aligned in the axial direction, and the controller is configured to be able to choose to drive one first cylinder on the entry side and one first cylinder on the exit side such that resultant force thereof acts on a central portion of the bearing when the roll performs bending and when at
- FIG. 1 is a figure illustrating an overview of a rolling facility including a rolling mill of a first or second embodiment.
- FIG. 2 is a front view for explaining an overview of the rolling mill.
- FIG. 3 is a figure illustrating part of a cross-sectional view taken along A-A' in FIG. 2 .
- FIG. 4 is a figure illustrating part of a cross-sectional view taken along B-B' in FIG. 2 .
- FIG. 5 , FIG. 6 , and FIG. 7 are plan views for explaining details of a work-roll portion of the rolling mill.
- FIG. 1 An overview of the rolling facility including the rolling mill of the present embodiment is explained by using FIG. 1 .
- a rolling facility 1 includes: a plurality of rolling mills that perform hot rolling of a rolled material 5 into a strip; and a controller 80.
- the rolling mills include 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 an entry side of the rolled material 5.
- 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 part of the controller 80 that controls the stands correspond to what is called a rolling mill in the present invention.
- rolling facility 1 is not limited to one including seven stands like the one illustrated in FIG. 1 , but can be one including at least two stands.
- FIG. 2 part of the overview of the rolling mill of the present invention is explained by using FIG. 2 .
- the seventh stand 70 illustrated in FIG. 1 is explained as an example in FIG. 2
- the rolling mill of the present invention can be applied to any stand 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. 1 .
- the seventh stand 70 which is a rolling mill of the present embodiment is a rolling mill including six rolls that roll the rolled material 5, and has a housing 700, the controller 80 and a hydraulic device (illustration omitted).
- the housing 700 includes: an upper work roll 710 and a lower work roll 711; and an upper intermediate roll 720 and a lower intermediate roll 721 that support the upper work roll 710 and the lower work roll 711 by being in contact with the upper work roll 710 and the lower work roll 711, respectively. Furthermore, the housing 700 includes an upper backup roll 730 and a lower backup roll 731 that support the upper intermediate roll 720 and the lower intermediate roll 721 by being in contact with the upper intermediate roll 720 and the lower intermediate roll 721, respectively.
- the upper work roll 710 has, at its axial end parts on both the drive side and the work side, bearings 790 (see FIG. 5 ) that are shifted in the roll-axis direction together with the upper work roll 710 and that receive loads from the roll, and these bearings are supported by upper-work-roll bearing housings 712 and 712A.
- the lower work roll 711 also has bearings (omitted for the convenience of illustration) at its axial end parts on both the drive side and the work side, and these bearings are supported by lower-work-roll bearing housings 713 and 713A.
- a shift cylinder 715 illustrated in FIG. 3 is driven via the work-side upper-work-roll bearing housing 712, and accordingly, the upper work roll 710 is configured to be able to be shifted in the roll-axis direction via a shift mechanism 715A.
- the lower work roll 711 also is configured to be able to be shifted in the roll-axis direction by a shift cylinder 716 illustrated in FIG. 3 via the work-side lower-work-roll bearing housing 713.
- the upper intermediate roll 720 has bearings (illustration omitted) at its axial end parts on both the drive side and the work side, and these bearings are supported by upper-intermediate-roll bearing housings 722A and 722, respectively.
- the lower intermediate roll 721 also has bearings (illustration omitted) at its axial end parts on both the drive side and the work side, and these respective bearings are supported by lower-intermediate-roll bearing housings 723A and 723.
- the upper intermediate roll 720 is configured to be able to be shifted in the roll-axis direction by a shift cylinder 725 illustrated in FIG. 3 via the drive-side upper-intermediate-roll bearing housing 722A.
- the lower intermediate roll 721 is also configured to be able to be shifted in the roll-axis direction by a shift cylinder 726 illustrated in FIG. 3 via the drive-side lower-intermediate-roll bearing housing 723A.
- an entry-side fixation member 702 is fixed to the housing 700 on the entry side of the rolled material 5
- an exit-side fixation member 703 is fixed to the housing 700 on an exit side of the housing 700 opposite to the entry-side fixation member 702 on an exit side of the rolled material 5.
- upper-work-roll bending cylinders 740 provided to a work-roll bending block part 714 of the entry-side fixation member 702, an upper-work-roll bending cylinder 742 provided to an upper-intermediate-roll bending block part 727, and upper-work-roll bending cylinders 741 and 743 provided to the exit-side fixation member 703 support the upper-work-roll bearing housings 712 and 712A, and by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing of the upper work roll 710 and to thereby cause the upper work roll 710 to perform bending.
- lower-work-roll bending cylinders 744 provided to the entry-side fixation member 702
- a lower-work-roll bending cylinder 746 provided to a lower-intermediate-roll bending block part 728
- lower-work-roll bending cylinders 745 and 747 provided to the exit-side fixation member 703 support the lower-work-roll bearing housings 713 and 713A, and by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing of the lower work roll 711 and to thereby cause to the lower work roll 711 to perform bending.
- upper-intermediate-roll bending cylinders 750 provided to the upper-intermediate-roll bending block part 727 of the entry-side fixation member 702, and upper-intermediate-roll bending cylinders 751 provided to the upper-intermediate-roll bending block part 727 of the exit-side fixation member 703 support the upper-intermediate-roll bearing housings 722 and 722A, and by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing and to thereby cause the upper intermediate roll 720 to perform bending.
- the upper-intermediate-roll bending block part 727 is provided with the upper-work-roll bending cylinders 742 and 743 on the entry side and the exit side, respectively, and by driving these cylinders as appropriate, it is possible to cause the upper work roll 710 to perform bending.
- a lower-intermediate-roll bending cylinder 752 provided to the lower-intermediate-roll bending block part 728 of the entry-side fixation member 702, and a lower-intermediate-roll bending cylinder 753 provided to the lower-intermediate-roll bending block part 728 of the exit-side fixation member 703 support the lower-intermediate-roll bearing housings 723 and 723A, and by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing and to thereby cause the lower intermediate roll 721 to perform bending.
- the lower-intermediate-roll bending block part 728 is provided with the lower-work-roll bending cylinders 746 and 747 on the entry side and the exit side, respectively, and by driving these cylinders as appropriate, it is possible to cause the lower work roll 711 to perform bending.
- the upper-work-roll bending cylinders 740 and 741 are arranged such that bending force is applied to the bearings of the upper work roll 710 that contacts the rolled material 5 in a direction toward the vertical increase-side (away from the rolled material) to cause the roll to perform bending (first cylinders).
- the upper-work-roll bending cylinders 742 and 743 are arranged such that bending force is applied to the bearings in a direction toward the vertical decrease-side (toward the rolled material), which is the opposite direction to the bending force applied by the upper-work-roll bending cylinders 740 and 741 to cause the upper work roll 710 to perform bending.
- the lower-work-roll bending cylinders 744 and 745 are arranged such that bending force is applied to the bearings of the lower work roll 711 that contacts the rolled material 5 in the direction toward the vertical increase-side to cause the roll to perform bending (first cylinders).
- the lower-work-roll bending cylinders 746 and 747 are arranged such that bending force is applied to the bearings in the direction toward the decrease-side, which is the opposite direction to the lower-work-roll bending cylinders 744 and 745 to cause the lower work roll 711 to perform bending.
- the upper-intermediate-roll bending cylinders 750 and 751 are arranged such that bending force is applied to the bearings of the upper intermediate roll 720 in the direction toward the vertical increase-side, and the roll performs bending (first cylinders).
- the lower-intermediate-roll bending cylinders 752 and 753 are arranged such that bending force is applied to the bearings of the lower intermediate roll 721 in the direction toward the vertical increase-side to cause the roll to perform bending (first cylinder).
- the entry-side fixation member 702 on the entry side of the rolled material 5 is provided with upper-work-roll bearing-housing backlash elimination cylinders 760 (second cylinders) such that horizontal force, specifically pressing force in the rolling direction, is applied to the upper work roll 710 via liners (illustration omitted) of the upper-work-roll bearing housings 712 and 712A.
- the entry-side fixation member 702 is provided with lower-work-roll bearing-housing backlash elimination cylinders 762 (second cylinders) such that pressing force is applied to the lower work roll 711 in the rolling direction via liners of the lower-work-roll bearing housings 713 and 713A. Thereby, desired force can be applied to the work roll or the like in the direction orthogonal to the roll-axis direction.
- the exit-side fixation member 703 on the exit side of the rolled material 5 is provided with upper-intermediate-roll bearing-housing backlash elimination cylinders 771 (second cylinders) such that horizontal force, that is, pressing force in the direction opposite to the rolling direction, is applied to the upper intermediate roll 720 via liners of the upper-intermediate-roll bearing housings 722A and 722.
- the exit-side fixation member 703 is provided with lower-intermediate-roll bearing-housing backlash elimination cylinders 773 (second cylinders) such that pressing force is applied to the lower intermediate roll 721 in the direction opposite to the rolling direction via liners of the lower-intermediate-roll bearing housings 723A and 723.
- the upper backup roll 730 has bearings (illustration omitted) at its axial end portions on both the drive side and the work side, and these bearing are supported by upper-backup-roll bearing housings 732.
- the lower backup roll 731 also has bearings (illustration omitted) at its axial end portions on both the drive side and the work side, and these bearings are supported by lower-backup-roll bearing housings 733.
- the housing 700 is provided with upper-backup-roll bearing-housing backlash elimination cylinders 780 such that horizontal force is applied to the upper backup roll 730 via the upper-backup-roll bearing housings 732.
- the housing 700 is provided with lower-backup-roll bearing-housing backlash elimination cylinders 782 such that horizontal force is 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, backlash elimination cylinders, or shift cylinders that are mentioned above, or rolling cylinders (illustration omitted) that apply rolling force for rolling the rolled material 5 to the upper work roll 710 and the lower work roll 711.
- This hydraulic device is connected to the controller 80.
- the controller 80 performs actuation control of the hydraulic device, and supplies and discharges a hydraulic fluid to the bending cylinders and the like mentioned above, to thereby perform drive control of those cylinders.
- the upper intermediate roll 720, the lower work roll 711, and the lower intermediate roll 721 also can have configurations equivalent to those of the upper work roll 710. Their detailed configurations are approximately the same as those of the upper work roll 710, and accordingly, explanation thereof is omitted.
- the present invention is suitably applied to the upper work roll 710 illustrated in FIG. 5 or the lower work roll 711.
- two upper-work-roll bending cylinders 740 are provided in the roll-axis direction.
- two upper-work-roll bending cylinders 741 are provided, and two first cylinders are provided being aligned in the axial direction on each of the entry side and the exit side in the rolling direction.
- the two upper-work-roll bending cylinders 740 provided on the entry side of the rolled material 5, and the two upper-work-roll bending cylinders 741 provided on the exit side of the rolled material 5 are arranged such that they overlap each other when seen in the rolling direction.
- an upper-work-roll bearing-housing backlash elimination cylinder 760 arranged on the entry side of the rolled material 5 is arranged at an axially intermediate position between two upper-work-roll bending cylinders 740 provided on the same entry side when seen in the rolling direction.
- acting positions of the exit force of the two upper-work-roll bending cylinders 740 and 741 to be driven, and the acting position of the exit force of the one upper-work-roll bearing-housing backlash elimination cylinder 760 to be driven are set such that each of them is kept within L B /4 on the axially outer side from the axial center of the bearing 790, and L B /4 on the axially inner side from the axial center of the bearing 790, that is, within L B /2 from the axial center of the bearing 790, when it is assumed that the axial length of the bearing 790 is set to L B , or the exit force is controlled in such a manner.
- the shift amount of the upper work roll 710 that is, the shift amount of the axial center of the bearing 790 is L S (it is assumed that the shift amount in the direction toward the drive direction is a positive amount).
- the bearing center is in any of sections A, B, and C illustrated in FIG. 5 .
- the bearing center is in the section C, on the drive side, axially inner cylinders in both the entry-side upper-work-roll bending cylinders 740 and the exit-side upper-work-roll bending cylinders 741 are not driven, but axially outer cylinders in both the entry-side upper-work-roll bending cylinders 740 and the exit-side upper-work-roll bending cylinders 741 are driven.
- the total exit force of the driven cylinders on the entry side and the exit side acts on the portion near the intersection between the roll-axis line and a line linking the driven cylinders.
- the acting position of the total exit force of the cylinders is arranged such that it is kept within L B /4 on the axially outer side from the axial center of the bearing 790, and L B /4 on the axially inner side from the axial center of the bearing 790, that is, within L B /2 from the axial center of the bearing 790.
- the boundary between the section A and the section B is present at a position within L B /4 on the axially outer side from the intersection between the roll-axis line and a straight line linking the axially outer entry-side upper-work-roll bending cylinder 740 and the axially inner exit-side upper-work-roll bending cylinder 741 (or a straight line linking the axially inner entry-side upper-work-roll bending cylinder 740 and the axially outer exit-side upper-work-roll bending cylinder 741).
- the boundary between the section B and the section C is present at a position within L B /4 on the axially inner side from the intersection described above.
- axially outer cylinders in both the entry-side upper-work-roll bending cylinders 740 and the exit-side upper-work-roll bending cylinders 741 are not driven, but axially inner cylinders in both the entry-side upper-work-roll bending cylinders 740 and the exit-side upper-work-roll bending cylinders 741 are driven.
- axially inner cylinders in both the entry-side upper-work-roll bending cylinders 740 and the exit-side upper-work-roll bending cylinders 741 are not driven, but axially outer cylinders in both the entry-side upper-work-roll bending cylinders 740 and the exit-side upper-work-roll bending cylinders 741 are driven.
- the controller 80 drives the first cylinder adjacent to the first cylinders that overlap each other when seen in the rolling direction. More specifically, in this configuration, the axially inner first cylinder in the two first cylinders provided on one of the entry side or the exit side is driven, and the axially outer first cylinder in the two first cylinders provided on the other of the entry side or the exit side is driven.
- the axially outer cylinder in the entry-side upper-work-roll bending cylinders 740 is not driven, but the axially inner cylinder in the entry-side upper-work-roll bending cylinders 740 is driven.
- the axially inner cylinder in the exit-side upper-work-roll bending cylinders 741 is not driven, but the axially outer cylinder in the exit-side upper-work-roll bending cylinders 741 is driven.
- the axially outer cylinder in the entry-side upper-work-roll bending cylinders 740 is not driven, but the axially inner cylinder in the entry-side upper-work-roll bending cylinders 740 is driven.
- the axially inner cylinder in the exit-side upper-work-roll bending cylinders 741 is not driven, but the axially outer cylinder in the exit-side upper-work-roll bending cylinders 741 is driven (items without parentheses in the section B in TABLE 1).
- the axially inner cylinder in the entry-side upper-work-roll bending cylinders 740 is not driven, but the axially outer cylinder in the entry-side upper-work-roll bending cylinders 740 is driven.
- the axially outer cylinder in the exit-side upper-work-roll bending cylinders 741 is not driven, but the axially inner cylinder in the exit-side upper-work-roll bending cylinders 741 is driven.
- the axially inner cylinder in the entry-side upper-work-roll bending cylinders 740 is not driven, but the axially outer cylinder in the entry-side upper-work-roll bending cylinders 740 is driven.
- the axially outer cylinder in the exit-side upper-work-roll bending cylinders 741 is not driven, but the axially inner cylinder in the exit-side upper-work-roll bending cylinders 741 is driven (items with parentheses in the section B in TABLE 1).
- the upper-work-roll bearing-housing backlash elimination cylinders 760 are driven no matter which of the sections A, B and C the bearing center is in as illustrated by TABLE 1.
- exit force of the upper-work-roll bending cylinders 740 and 741 and the exit force of the upper-work-roll bearing-housing backlash elimination cylinders 760 have only two states, ON and OFF, in the example described above, by more finely and individually adjusting the exit force of each upper-work-roll bending cylinder 740 or 741 and the exit force of each upper-work-roll bearing-housing backlash elimination cylinder 760, it is possible to cause the bending force to act on the axial center of the bearing 790 more accurately.
- the number of cylinders to be provided on each of the entry side and the exit side only has to be two or larger and is not particularly limited.
- three upper-work-roll bending cylinders 740A are provided in the roll-axis direction.
- three upper-work-roll bending cylinders 741A are provided, and three first cylinders are provided being aligned in the axial direction on each of the entry side and the exit side in the rolling direction.
- the three upper-work-roll bending cylinders 740A provided on the entry side of the rolled material 5, and the three upper-work-roll bending cylinders 741A provided on the exit side of the rolled material 5 are arranged such that all of them overlap each other when seen in the rolling direction.
- upper-work-roll bearing-housing backlash elimination cylinders 760 are added between the entry-side upper-work-roll bending cylinders 740 in FIG. 5 and the entry-side upper-work-roll bending cylinders 740A in FIG. 6 .
- the bearing center is present in any of the sections A, B, and C illustrated in FIG. 6 .
- the bearing center is in the section C, on the drive side, only the axially outer cylinder in the entry-side upper-work-roll bending cylinders 740A is driven, and only the axially middle cylinder in the exit-side upper-work-roll bending cylinders 741A is driven.
- first cylinders are driven such that a line linking driven cylinders on the entry side and the exit side on the drive side, and a line linking driven cylinders on the entry side and the exit side on the work side do not become parallel with each other, but cross at a position on the entry side or exit side of the rolled material 5, that is, become diagonal to each other, except when the axial center of the bearing 790 has not been shifted to between the axially middle upper-work-roll bending cylinders 740A and 741A on the drive side.
- the upper-work-roll bearing-housing backlash elimination cylinders 760 are driven no matter which of the sections A, B, and C the bearing center is in as illustrated by TABLE 2.
- the driving and pressures of two cylinders that are arrayed in the axial direction are adjusted such that the acting position is not apart from each bearing-center position in the sections A, B, and C as much as possible.
- the rolling mill of the present embodiment mentioned above includes: the roll that is shifted in the axial direction; the bearing 790 and the four or more first cylinders that are provided on each of the drive side and the work side, the bearing 790 being configured to be shifted in the axial direction of the roll along with the roll and to receive a load from the roll, the four or more first cylinders being configured to apply bending force vertically to the bearing 790 and to cause the roll to perform bending; and the controller 80 that drives the first cylinders.
- first cylinders in the first cylinders are provided on each of the entry side and the exit side in the rolling direction, the two or more first cylinders being aligned in the axial direction, and the controller 80 is configured to be able to choose to drive one first cylinder on the entry side and one first cylinder on the exit side such that the resultant force thereof acts on a central portion of the bearing 790 when the roll performs bending and when at least the center of the bearing 790 is arranged between the axially outermost first cylinder and the axially innermost first cylinder in the first cylinders.
- the bearing center is arranged between first cylinders, it is not necessary to drive all of the four or more first cylinders provided per bearing, but it is possible to cause the resultant bending force of two first cylinders to act on the portion near a lengthwise middle portion of the bearing. Accordingly, it is not necessary to provide a large number of mechanisms for adjusting the pressing force of each cylinder for the purpose of reducing the offset load on the bearing, the control can be performed simply, and thus, the configuration can be simplified as compared to conventional rolling mills.
- the entry side first cylinders and the exit side first cylinders are arranged overlapping each other when seen in the rolling direction. Accordingly, it is possible to more simply cause the resultant bending force of two first cylinders to act on the portion near a lengthwise middle portion of the bearing.
- the rolling mill further includes the entry-side fixation member 702 and/or the exit-side fixation member 703 that is/are fixed to at least either of the entry side and the exit side of the housing of the rolling mill in the rolling direction and that is/are provided with the first cylinders; and the second cylinders that are disposed on either of the entry side and the exit side at the exit-side fixation member 703 or the entry-side fixation member 702 and that apply pressing force to the bearings 790 in the rolling direction or in a direction opposite to the rolling direction.
- the controller 80 is configured to drive the first cylinder adjacent to the first cylinders that overlap each other when seen in the rolling direction, for example, in a case in which there are four first cylinders, to drive the axially inner first cylinder in two first cylinders provided on one of the entry side and the exit side, and drive the axially outer first cylinder in two first cylinders provided on the other of the entry side and the exit side.
- the controller 80 can cause the resultant bending force to act on the portion near a lengthwise middle portion of the bearing with the two first cylinders more accurately and simply. Accordingly, it is possible to reduce the offset load on the bearing with a simple configuration not being provided with a large number of mechanisms for adjusting pressing force of each cylinder.
- the shift amount Ls is divided into the sections A and B.
- TABLE 3 indicates a relation between the bearing-center position and the state of driving of each cylinder.
- the intersection position between the roll-axis line and the line linking e1 and d2 is the boundary between the section B and the section A. No matter which of the sections A and B the bearing center is present in, both the two exit-side upper-work-roll bending cylinders 741 are driven.
- the axially inner upper-work-roll bending cylinder 740, e1, the upper-work-roll bending cylinder 741, d1 and the upper-work-roll bending cylinder 741, d2 are driven with the exit force of the upper-work-roll bending cylinder 741, d1 being set to a value obtained by multiplying required exit-side bending force Pbd by a predetermined coefficient ⁇ d1, and the exit force of the upper-work-roll bending cylinder 741, d2 being set to a value obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient ⁇ d2.
- the axially outer upper-work-roll bending cylinder 740, e2 the upper-work-roll bending cylinder 741, d1 and the upper-work-roll bending cylinder 741, d2 are driven with the exit force of the upper-work-roll bending cylinder 741, d1 being set to a value obtained by multiplying the required exit-side bending force Pbd by the predetermined coefficient ⁇ d1, and the exit force of the upper-work-roll bending cylinder 741, d2 being set to a value obtained by multiplying the required exit-side bending force Pbd by the predetermined coefficient ⁇ d2.
- the exit side first cylinders is chosen to drive all of the exit side first cylinders and to drive only one entry side first cylinder.
- it may be chosen to drive all of the entry side first cylinders and to drive only one exit side first cylinder.
- the second cylinders provided on the entry side in FIG. 7 may be provided on the exit side.
- the upper-work-roll bearing-housing backlash elimination cylinders 760 are driven no matter which of the sections A and B the bearing center is in.
- the bearing center is arranged between first cylinders, it is not necessary to drive all of the four first cylinders provided per bearing, but it is possible to cause the resultant bending force of three first cylinders to act on the portion near a lengthwise middle portion of the bearing. Accordingly, it is not necessary to provide a large number of mechanisms for adjusting the pressing force of each cylinder for the purpose of reducing the offset load on the bearing, the control can be performed simply, and thus, the configuration can be simplified as compared to conventional rolling mills. Furthermore, because non-stepwise adjustments of the resultant bending force of the first cylinders are possible, it becomes easy to cause the bearing center and the acting position of the resultant bending force to match no matter which position in the section the bearing center is in.
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Applications Claiming Priority (1)
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JP2019194120A JP6979437B2 (ja) | 2019-10-25 | 2019-10-25 | 圧延機および圧延方法 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4773246A (en) * | 1986-02-14 | 1988-09-27 | Clecim | Process for adjusting the profile of rolls movable in a rolling mill and improved rolling mill for carrying out the process |
JPS6355369B2 (de) | 1983-06-13 | 1988-11-02 | Hitachi Ltd | |
EP1230991A2 (de) * | 2001-02-13 | 2002-08-14 | Hitachi, Ltd. | Tandemwalzwerksanlage und Walzverfahren unter Verwendung derselben |
DE69905332T2 (de) * | 1998-11-30 | 2003-10-23 | Kvaerner Metals Clecim Courbev | Walzwerk mit Mitteln zur Biegung der Arbeitswalzen |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CA1243510A (en) * | 1983-07-13 | 1988-10-25 | Atsuo Mizuta | Process for width reduction of plate-like stock material |
JPS62275508A (ja) * | 1986-05-21 | 1987-11-30 | Hitachi Ltd | 六段圧延機 |
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 |
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 |
JP3689037B2 (ja) * | 2001-12-07 | 2005-08-31 | 株式会社日立製作所 | タンデム圧延機の形状制御方法および装置 |
CN100467152C (zh) * | 2007-07-26 | 2009-03-11 | 大连华锐股份有限公司 | 采用复合式弯辊液压缸的带钢轧机 |
CN102335677A (zh) * | 2010-07-23 | 2012-02-01 | 宝山钢铁股份有限公司 | 一种厚板轧机机架辊快速更换装置及更换方法 |
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2019
- 2019-10-25 JP JP2019194120A patent/JP6979437B2/ja active Active
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2020
- 2020-09-29 CN CN202011050543.6A patent/CN112705572B/zh active Active
- 2020-10-19 EP EP20202668.8A patent/EP3812057B1/de active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6355369B2 (de) | 1983-06-13 | 1988-11-02 | Hitachi Ltd | |
US4773246A (en) * | 1986-02-14 | 1988-09-27 | Clecim | Process for adjusting the profile of rolls movable in a rolling mill and improved rolling mill for carrying out the process |
DE69905332T2 (de) * | 1998-11-30 | 2003-10-23 | Kvaerner Metals Clecim Courbev | Walzwerk mit Mitteln zur Biegung der Arbeitswalzen |
EP1230991A2 (de) * | 2001-02-13 | 2002-08-14 | Hitachi, Ltd. | Tandemwalzwerksanlage und Walzverfahren unter Verwendung derselben |
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CN112705572B (zh) | 2022-12-23 |
JP6979437B2 (ja) | 2021-12-15 |
EP3812057B1 (de) | 2023-01-04 |
CN112705572A (zh) | 2021-04-27 |
JP2021065919A (ja) | 2021-04-30 |
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