EP3981522A1 - Rolling mill - Google Patents
Rolling mill Download PDFInfo
- Publication number
- EP3981522A1 EP3981522A1 EP19949862.7A EP19949862A EP3981522A1 EP 3981522 A1 EP3981522 A1 EP 3981522A1 EP 19949862 A EP19949862 A EP 19949862A EP 3981522 A1 EP3981522 A1 EP 3981522A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- cylinders
- cylinder
- bearing
- bending
- 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 134
- 238000005452 bending Methods 0.000 claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 42
- 238000013000 roll bending Methods 0.000 description 187
- 230000008030 elimination Effects 0.000 description 56
- 238000003379 elimination reaction Methods 0.000 description 56
- 230000008901 benefit Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
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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
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- 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
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- 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
- B21B2031/206—Horizontal offset of work rolls
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to a rolling mill.
- Patent Document 1 describes one example of rolling mills that can prevent occurrence of extreme offset loads on bearings, and make it possible to attempt to extend the service life of the bearings, increase the roll shift amount, and in turn 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 proximate to the lengthwise center of the bearing is set high, and the hydraulic pressure of a cylinder not proximate 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.
- Patent Document 1 JP-1988-055369-B
- Patent Document 1 describes one example of a technology for suppressing offset loads to 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.
- the rolling mill requires a large number of bending cylinders according to shifting of rolls, and furthermore requires a large number of mechanisms for adjusting pressing force of the cylinders.
- Patent Document 1 eight cylinders and at least four adjustment mechanisms are required per bearing. Since the number of components of such a rolling mill increases, there is room for improvement in terms of simplification of the structure.
- An object of the present invention is to provide a rolling mill having a structure that can reduce offset loads on bearings even with a simple structure as compared to conventional rolling mills.
- the present invention includes plurality of means for solving the problem described above, and one example thereof is 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 three or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, in which the bearing and the first cylinders are provided on each a drive side and an work side of the roll, two first cylinders among the first cylinders are provided in the roll-axis direction on the exit side or entry side in a rolling direction, one first cylinder among the first cylinders is provided on a side that is one of the exit side and the entry side in the rolling direction, and that is opposite to a side provided with the two first cylinders, and the first cylinder on the opposite side is positioned between the two first cylinders when viewed from the exit side or entry side in the rolling direction.
- FIG. 1 is a figure illustrating an overview of a rolling facility including a rolling mill according to the present first 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 is a plan view for explaining details of an intermediate-roll portion.
- FIG. 1 the overview of the rolling facility including the rolling mill according to the present embodiment is explained by using FIG. 1 .
- a rolling facility 1 has: 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 the rolled material 5 entry side.
- Each 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 in the stands, and a portion 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 a facility including seven stands like the one illustrated in FIG. 1 , and can be a facility including at least two stands.
- FIG. 2 part of the overview of the rolling mill according to 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 according to 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 according to the present embodiment, is a rolling mill including six rolls that roll 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 intermediate roll 720 and a lower intermediate roll 721 that support the upper work roll 710 and the lower work roll 711 by contacting the upper work roll 710 and the lower work roll 711, respectively. Furthermore, the housings 700 include 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 contacting the upper intermediate roll 720 and the lower intermediate roll 721, respectively.
- the upper work roll 710 in the rolls has, at its axial end portions and on both the drive side and the work side, bearings (omitted for the convenience of illustration) that are shifted in the roll-axis direction together with the upper work roll 710, and receive loads from the roll, and these bearings are supported by upper-work-roll bearing housings 712.
- the lower work roll 711 also has bearings (illustration omitted) at its axial end portions and on both the drive side and the work side, and these bearings are supported by lower-work-roll bearing housings 713.
- the upper work roll 710 is configured to be shifted in the roll-axis direction by a shift cylinder 715 like the one illustrated in FIG. 3 via a work-side upper-work-roll bearing housing 712.
- the lower work roll 711 also is configured to be shifted in the roll-axis direction by a shift cylinder 716 like the one illustrated in FIG. 3 via a work-side lower-work-roll bearing housing 713.
- the upper intermediate roll 720 has bearings 790 (see FIG. 5 ) at its axial end portions and on both the drive side and the work side, and these bearings 790 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 portions and on both the drive side and the work side, and these bearings are supported by lower-intermediate-roll bearing housings 723A and 723, respectively.
- the upper intermediate roll 720 is configured to be shifted in the roll-axis direction by a shift cylinder 725 like the one illustrated in FIG. 3 via the drive-side upper-intermediate-roll bearing housing 722A.
- the lower intermediate roll 721 also is configured to be shifted in the roll-axis direction by a shift cylinder 726 like the one illustrated in FIG. 3 via the drive-side lower-intermediate-roll bearing housing 723A.
- an entry-side fixation member 702 is fixed to the rolled material 5 entry-side housing 700, and on the rolled material 5 exit side, an exit-side fixation member 703 is fixed to the exit-side housing 700 such that the exit-side fixation member 703 becomes opposite to the entry-side fixation member 702.
- 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 housing 712, and, by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing of the upper work roll 710 to cause the upper work roll 710 to perform bending.
- lower-work-roll bending cylinders 744 and 746 provided to the entry-side fixation member 702 and lower-work-roll bending cylinders 745 and 747 provided to the exit-side fixation member 703 support the lower-work-roll bearing housing 713, and, by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing of the lower work roll 711 to cause 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 an upper-intermediate-roll bending cylinder 751 provided to the upper-intermediate-roll bending block part 727 of the exit-side fixation member 703 support the upper-intermediate-roll bearing housing 722 or 722A, and, by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing 790 to 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, and, by driving these cylinders as appropriate, it is possible to cause the upper work roll 710 to perform bending.
- lower-intermediate-roll bending cylinders 752 provided to a 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 housing 723 or 723A, and, by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing 790 to 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, 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 (first cylinders) in these cylinders are arranged such that bending force is applied to the bearings of the upper work roll 710, which contacts the rolled material 5, toward the vertical increase side (away from the rolled material), to thereby cause the upper work roll 710 to perform bending.
- the upper-work-roll bending cylinders 742 and 743 (fifth cylinders) are arranged such that bending force is applied to the bearings toward the vertical decrease side (in the direction toward the rolled material), which is a direction opposite to the bending force applied by the upper-work-roll bending cylinders 740 and 741, to thereby 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 toward the vertical increase side, to thereby cause the lower work roll 711 to perform bending.
- the lower-work-roll bending cylinders 746 and 747 are arranged such that bending force is applied to the bearings toward the decrease side, which is a direction opposite to the bending force applied by the lower-work-roll bending cylinders 744 and 745, to thereby 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 790 of the upper intermediate roll 720 toward the vertical increase side, to thereby cause the roll to perform bending.
- the lower-intermediate-roll bending cylinders 752 and 753 are arranged such that bending force is applied to the bearings 790 of the lower intermediate roll 721 toward the vertical increase side, to thereby cause the roll to perform bending.
- the entry-side fixation member 702 on the rolled material 5 entry side 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.
- 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.
- desired force can be applied to the work roll or the like in a direction orthogonal to the roll-axis direction.
- the exit-side fixation member 703 on the rolled material 5 exit side is provided with upper-intermediate-roll bearing-housing backlash elimination cylinders 771 (second cylinders) such that horizontal force, that is, pressing force in a 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 a 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 and 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 and on both the drive side and the work side, and these bearings are supported by lower-backup roll bearing housings 733.
- the entry-side 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 entry-side 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 work roll 710, the lower work roll 711, and the lower intermediate roll 721 also can have configurations equivalent to those of the upper intermediate roll 720.
- Their configurational details are approximately the same as those of the upper intermediate roll 720, and therefore explanations thereof are omitted.
- the present invention is suitably applied to the upper intermediate roll 720 like the one illustrated in FIG. 5 or the lower intermediate roll 721.
- two upper-intermediate-roll bending cylinders 750 are provided in the roll-axis direction.
- one upper-intermediate-roll bending cylinder 751 is provided on the rolled material 5 exit side.
- the upper-intermediate-roll bending cylinder 751 provided on the rolled material 5 exit side in the cylinders is arranged such that it is positioned between the two upper-intermediate-roll bending cylinders 750 provided on the opposite entry side when viewed in the rolling direction.
- the axially-outer upper-intermediate-roll bending cylinder 750 in the two upper-intermediate-roll bending cylinders 750 provided on the entry side on each the drive side and the work side is arranged outside an area within which the center of the bearing 790 is shifted when the upper intermediate roll 720 is shifted in the axial direction by the shift cylinder 725 via a shift mechanism 725A.
- the upper-intermediate-roll bearing-housing backlash elimination cylinders 771 arranged on the rolled material 5 exit side are arranged on both axial sides of the one upper-intermediate-roll bending cylinder 751 provided on the same exit side when viewed in the rolling direction.
- an acting position of the output force of the three upper-intermediate-roll bending cylinders 750 and 751, and an acting position of the output force of the two upper-intermediate-roll bearing-housing backlash elimination cylinders 771 are arranged such that each of them is kept within L B /4 on the axially-outer side of the axial center of the bearing 790, and within L B /4 on the axially-inner side of the axial center of the bearing 790, that is, within L B /2 from the axial center of the bearing 790, when the axial length of the bearing 790 is defined as L B , or the output force is controlled in such a manner.
- the intermediate position of the two entry-side upper-intermediate-roll bending cylinders 750, and the intermediate position of the two exit-side upper-intermediate-roll bearing-housing backlash elimination cylinders 771 are the same with each other or proximate to each other desirably.
- the axial position of the exit-side upper-intermediate-roll bending cylinder 751 is positioned at the intermediate position of the axial positions of the two entry-side upper-intermediate-roll bending cylinders 750, that is, at the intermediate position between the two upper-intermediate-roll bearing-housing backlash elimination cylinders 771.
- the upper-work-roll bending cylinder 742 arranged on the rolled material 5 entry side is provided at an axial position between the two upper-intermediate-roll bending cylinders 750 that are provided in the axial direction.
- the upper-work-roll bending cylinder 743 arranged on the rolled material 5 exit side is provided at a position on the axially-inner side of the upper-intermediate-roll bending cylinder 751.
- the controller 80 is configured to perform control such that when bending of the roll is performed, the difference between the total output force of the two first cylinders, and the output force of the first cylinder provided on the opposite side is within a predetermined range.
- the resultant force of the roll bending cylinders is caused to act on the roll-axis line.
- the controller 80 is configured to drive any one of or both of the two upper-intermediate-roll bending cylinders 750 arranged on the entry side, and drive the first cylinder provided on the opposite side, according to the shift position of the upper intermediate roll 720.
- the shift amount of the upper intermediate roll 720 that is, the shift amount of the axial center of the bearing 790, is defined as Ls (the shift amount toward the drive direction is defined as a positive amount).
- the bearing center exists in any of sections A, B, and C illustrated in FIG. 5 .
- the bearing center exists in the section C, on the drive side, the axially-inner cylinder in the entry-side upper-intermediate-roll bending cylinders 750 is not driven, but the axially-outer upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven.
- the total output force of the driven cylinders on the entry side and the exit side acts on a position near the intersection of the roll-axis line and a line linking the driven cylinders.
- the acting position of the total output force of the cylinders is arranged such that it is kept within L B /4 on the axially-outer side of the axial center of the bearing 790, and within L B /4 on the axially-inner side of 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 exists at a position within L B /4 on the axially-outer side of the intersection of the roll-axis line and a straight line linking the axially-inner entry-side upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751.
- the boundary between the section B and the section C exists at a position within L B /4 on the axially-inner side of the intersection of the roll-axis line and a straight line linking the axially-outer entry-side upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751.
- the axially-outer cylinder in the entry-side upper-intermediate-roll bending cylinders 750 is not driven, but the axially-inner upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven.
- the axially-inner cylinder in the entry-side upper-intermediate-roll bending cylinders 750 is not driven, but the axially-outer upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven.
- the output force of both of the entry-side upper-intermediate-roll bending cylinders 750 is made 1/2 such that the total becomes the same as the output force of the exit-side upper-intermediate-roll bending cylinder, and the exit-side upper-intermediate-roll bending cylinder 751 is driven similarly to the cases of the sections A and C.
- both of the two cylinders are driven at output force which is 1/2 of required output force.
- the output force of the upper-intermediate-roll bending cylinders 750 and 751 and the output force of the upper-intermediate-roll bearing-housing backlash elimination cylinders 771 have three states, which are the ON state, 1/2 ON state and OFF state, in the case explained in the example described above, by separately and more finely adjusting the output force of each upper-intermediate-roll bending cylinder 750 or 751 and the output force of each upper-intermediate-roll bearing-housing backlash elimination cylinder 771, it is possible to cause the bending force to be applied onto the axial center of the bearing 790 more accurately.
- one example of different output control is explained.
- the axially-outer upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 750 by ⁇ 1, the axially-inner upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying the total output force by ⁇ 2, the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- the two upper-intermediate-roll bending cylinders 750 are driven along with the upper-intermediate-roll bending cylinder 751 in this manner.
- ⁇ 1 is set to 1
- ⁇ 2 is set to 0, and the axially-outer upper-intermediate-roll bending cylinder 750 and the upper-intermediate-roll bending cylinder 751 are driven.
- the axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven at output force obtained by multiplying required output force by a predetermined coefficient ⁇ 1
- the axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven at output force obtained by multiplying the required output force by a predetermined coefficient ⁇ 2.
- the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- only the axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven.
- the axially-outer upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 750 by ⁇ 1, the axially-inner upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying the total output force by ⁇ 2, the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- the two upper-intermediate-roll bending cylinders 750 are driven along with the upper-intermediate-roll bending cylinder 751 in this manner.
- ⁇ 1 is set to 0
- ⁇ 2 is set to 1
- the axially-inner upper-intermediate-roll bending cylinder 750 and the upper-intermediate-roll bending cylinder 751 are driven.
- the axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven at output force obtained by multiplying required output force by the predetermined coefficient ⁇ 1
- the axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven at output force obtained by multiplying the required output force by the predetermined coefficient ⁇ 2.
- the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- only the axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven.
- the axially-outer upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 750 by ⁇ 1
- the axially-inner upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying the total output force by ⁇ 2
- the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- the two upper-intermediate-roll bending cylinders 750 are driven along with the upper-intermediate-roll bending cylinder 751 in this manner.
- the axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven at output force obtained by multiplying required output force by the predetermined coefficient ⁇ 1
- the axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven at output force obtained by multiplying the required output force by the predetermined coefficient ⁇ 2.
- the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- the actuation position can be kept within L B /2 from the axial center of the bearing 790 when the bearing center exists in the section B, but the actuation position cannot be kept within L B /2 from the axial center of the bearing 790 when the bearing center exists in the section C or the section A in some cases.
- ⁇ 1 and ⁇ 2 it becomes possible to keep the actuation position within L B /2 from the axial center of the bearing 790 in each of the cases of the sections A, B, and C.
- ⁇ 1 and ⁇ 2 for each area need not be the same values, and can be set to different values as appropriate for each area such that the acting position of the total of the output force of the two upper-intermediate-roll bending cylinders 750 and the output force of the upper-intermediate-roll bending cylinder 751 approximately matches the center position of the bearing 790.
- the values of ⁇ 1 and ⁇ 2 for each area need not be the same values, and can be set to different values as appropriate for each area such that the acting position of the output force of the two upper-intermediate-roll bearing-housing backlash elimination cylinders 771 approximately matches the center position of the bearing 790.
- the rolling mill according to the first embodiment of the present invention mentioned above includes: a roll that is shifted in the axial direction; a bearing that is shifted in the roll-axis direction along with the roll, and receives a load from the roll; and three or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, and the bearing and the first cylinders are provided on each the drive side and the work side.
- Two first cylinders in the first cylinders are provided in the roll-axis direction on the rolled material 5 entry side or exit side, one first cylinder in the first cylinders is provided on a side which is one of the rolled material 5 exit side and entry side, and is opposite to a side provided with the two first cylinders, and the first cylinder on the opposite side is positioned between the two first cylinders when viewed in the rolling direction.
- first cylinders in the two first cylinders are arranged outside an area within which the center of the bearing is shifted, it is possible to cause the resultant force of the bending force of the first cylinders to act on a position near the lengthwise middle portion of the bearing more accurately and surely, and it is possible to reduce offset loads on the bearing more surely.
- second cylinders that apply pressing force to the bearing 790 in the rolling direction or in a direction opposite to the rolling direction are further included in one of the entry-side fixation member 702 and the exit-side fixation member 703 that are fixed to the housings 700 at least on either the rolled material 5 entry-side or exit-side, and are provided with the first cylinders.
- the bearings and the first cylinders are prevented from moved in the rolling direction at the time of biting of the top of the rolled material 5.
- an advantage of preventing the bending acting position from moved can be attained. That is, it is possible to suppress the movement of the bearings in the rolling direction in a state in which the bending force is acting thereon. Accordingly, a slip does not occur at portions that are pressed by the first cylinders, and it is possible to suppress damages to the first cylinders and wear on the pressed side, and to keep the bending precision high.
- the second cylinders that apply pressing force to the bearing in a rolling direction or in a direction opposite to the rolling direction are further included on either the entry side or the exit side, and the second cylinders are arranged on both of axial sides of the first cylinder when the rolling mill is viewed in the rolling direction, it becomes easier to cause the pressing force of the second cylinders to act on a position near the lengthwise middle portion of the bearing, and it is possible to make it more difficult for the bearings and the first cylinders to shift in the rolling direction at the time of biting of the rolled material. Accordingly, the bending precision can be kept higher.
- FIG. 6 illustrates a case where the pressing force of a second cylinder acts on a position near the lengthwise middle portion of the bearing in a case where only the drive-side axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven.
- the pressing force of the second cylinder is Fg2
- the outer reaction force and inner reaction force generated to liners of the upper-intermediate-roll bearing housing 722A and the upper-intermediate-roll bending block part 727 are F1 and F2, respectively.
- Fg2 Fd + F1 + F2. If any of F1 and F2 becomes 0, the liners are out of contact, and this is not preferable.
- Fg2 is generated near the Fd-acting position, and therefore, Fg2 can be made a relatively small value. That is, the pressing force of the second cylinder can be reduced.
- FIG. 7 illustrates a case where the pressing force of a second cylinder acts on a position away from a position near the lengthwise middle part of the bearing in a case where only the drive-side axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771 is driven.
- Fg1 inevitably becomes a large value for the balance of moments. This makes it necessary to use larger second cylinders, and it becomes structurally difficult to house such large cylinders in the upper-intermediate-roll bending block part 727.
- FIG. 6 by causing the pressing force of the second cylinders to act on a position near the lengthwise middle portion of the bearing, the output force required of the second cylinders can be reduced, and the size of the cylinders can be reduced. Thereby, they can be housed in the upper-intermediate-roll bending block part 727.
- the controller 80 that drives the first cylinders is further included, and the controller 80 is configured to drive any one first cylinder in the two first cylinders and drive the first cylinder provided on the opposite side when bending of the roll is performed and also the center of the bearing is arranged on the outer side of X, which is defined as an intersection of the roll-axis line and a straight line linking the outer first cylinder and the first cylinder provided on the opposite side, or is arranged on the inner side of Y, which is defined as an intersection of the roll-axis line and a straight line linking the inner first cylinder and the first cylinder provided on the opposite side.
- controller 80 that drives the first cylinders is further included, and the controller 80 is configured to perform control such that when bending of the roll is performed, the difference between the total output force of the two first cylinders and the output force of the first cylinder provided on the opposite side is within a predetermined range. Thereby, it is possible to cause almost the same bending force to act on the entry side and the exit side of the bearing, and it is possible to keep the roll stably.
- the upper intermediate roll 720 and the lower intermediate roll 721 typically have large shift amounts.
- the upper work roll 710 and the lower work roll 711 that contact the rolled material 5, and the upper intermediate roll 720 and the lower intermediate roll 721 that contact the upper work roll 710 and the lower work roll 711 are included, and the roll is used as the upper intermediate roll 720 and the lower intermediate roll 721.
- the fifth cylinders also to the same members as the first cylinders, and it is possible to attempt to save spaces.
- FIG. 8 The rolling mill according to a second embodiment of the present invention is explained by using FIG. 8 .
- the same configurations as the first embodiment are denoted with the same reference characters, and explanations thereof are omitted. The same applies also to the following embodiments.
- one upper-intermediate-roll bending cylinder 750A (first cylinder) is provided in the roll-axis direction on the rolled material 5 entry side, and two upper-intermediate-roll bending cylinders 751A (first cylinders) are provided on the rolled material 5 exit side.
- the upper-intermediate-roll bending cylinder 750A provided on the rolled material 5 entry side in the upper-intermediate-roll bending cylinders is arranged such that it is positioned between the two upper-intermediate-roll bending cylinders 751A provided on the opposite exit side when viewed in the rolling direction.
- an upper-intermediate-roll bearing-housing backlash elimination cylinder 771A arranged on the rolled material 5 exit side is arranged, in the axial direction, between the two upper-intermediate-roll bending cylinder 751A provided on the same exit side when viewed in the rolling direction.
- the axial positions of the upper-intermediate-roll bending cylinder 750A provided on the entry side and the exit-side upper-intermediate-roll bearing-housing backlash elimination cylinder 771A are desirably the same.
- the boundary between the section B and the section C exists at a position within L B /4 on the axially-inner side of the intersection of the entry-side upper-intermediate-roll bending cylinder 750A and the axially-outer exit-side upper-intermediate-roll bending cylinder 751A.
- the bearing center exists in the section C, on the drive side, the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-inner cylinder in the exit-side upper-intermediate-roll bending cylinders 751A is not driven, but the axially-outer cylinder is driven.
- the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-outer cylinder in the exit-side upper-intermediate-roll bending cylinders 751A is not driven, but the axially-inner cylinder is driven.
- the boundary between the section A and the section B exists at a position within L B /4 on the axially-outer side of the intersection of the entry-side upper-intermediate-roll bending cylinder 750A and the axially-inner exit-side upper-intermediate-roll bending cylinder 751A.
- the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-outer cylinder in the exit-side upper-intermediate-roll bending cylinders 751A is not driven, but the axially-inner cylinder is driven.
- the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-inner cylinder is not driven, but the axially-outer cylinder is driven.
- the entry-side upper-intermediate-roll bending cylinder 750A is driven similarly to the cases of the sections A and C, and the output force of both of the exit-side upper-intermediate-roll bending cylinders 751A is made 1/2 such that the total thereof becomes the same as the output force of the entry-side upper-intermediate-roll bending cylinder.
- the upper-intermediate-roll bearing-housing backlash elimination cylinder 771A is driven no matter which of the sections A, B, and C in TABLE 2 the bearing center exists in.
- the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
- the bearing center exists in any of sections A, B, and C illustrated in FIG. 8 .
- the second cylinder By arranging the second cylinder between the first cylinders in the axial direction when the rolling mill is viewed in the rolling direction, the second cylinder is positioned almost at the intermediate position of Ls. Accordingly, it becomes easier to cause the pressing force of the second cylinder to act on a position near the lengthwise middle portion of the shifted bearing, the output force required of the second cylinder can be reduced, and the size of the cylinder can be reduced. Thereby, it can be housed in the upper-intermediate-roll bending block part 727. Thereby, it becomes possible to make it difficult for the bearing and the first cylinders to shift in the rolling direction at the time of biting of the rolled material, and thus the bending precision can be kept higher.
- the axially-outer upper-intermediate-roll bending cylinder 751A is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 751A by ⁇ 1
- the axially-inner upper-intermediate-roll bending cylinder 751A is driven at output force obtained by multiplying the total output force by ⁇ 2
- the total of ⁇ 1 and ⁇ 2 is 1, and ⁇ 1 and ⁇ 2 are adjusted such that the acting position of the total output force is almost at the bearing center.
- the two upper-intermediate-roll bending cylinders 751A can be driven along with the upper-intermediate-roll bending cylinder 750A in this manner also.
- the rolling mill according to the present embodiment illustrated in FIG. 9 corresponds to the rolling mill according to the first embodiment, but is different in that it includes, between the two rolled material 5 entry-side upper-intermediate-roll bending cylinders 750, an upper-intermediate-roll bending cylinder 750B (third cylinder) that further applies bending force vertically to the bearing 790 to cause the roll to perform bending.
- the upper-intermediate-roll bending cylinder 750B is arranged so as to apply bending force toward the increase side.
- the shift amount of the bearing 790 is defined as L s , and L s is divided into sections A, B, C, and D.
- TABLE 3 illustrates a relation between the bearing-center position and the state of driving of each cylinder.
- the intersection position of the roll-axis line and a line linking e1 and d1 is the boundary between the section D and the section C.
- the intersection position of the roll-axis line and a line linking e3 and d1 is the boundary between the section B and the section A.
- the axially-outer upper-intermediate-roll bending cylinder 750,e1 is driven at output force obtained by multiplying required entry-side bending force Pbe by a predetermined coefficient ⁇ 1
- an upper-intermediate-roll bending cylinder 750B,e2 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient ⁇ 2
- the upper-intermediate-roll bending cylinder 751,d1 is driven.
- the upper-intermediate-roll bending cylinder 750B,e2 is driven at output force obtained by multiplying the required entry-side bending force Pbe by the predetermined coefficient ⁇ 2
- an axially-inner upper-intermediate-roll bending cylinder 750,e3 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient ⁇ 3
- the upper-intermediate-roll bending cylinder 751,d1 is driven.
- the resultant force of the entry-side bending force Pbe and the exit-side bending force Pbd is adjusted such that it becomes bending force required for the roll, and the resultant force is adjusted such that it acts on a position near the axial center of the roll.
- an axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771,g1 is driven at output force obtained by multiplying required backlash elimination pressing force Pg by the predetermined coefficient ⁇ 1
- an axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771,g2 is driven at output force obtained by multiplying the required backlash elimination pressing force Pg by the predetermined coefficient ⁇ 2.
- the values of ⁇ 1, ⁇ 2, and ⁇ 3 for each area need not be the same values, and can be set to different values as appropriate for each area such that the acting position of the output force of the four upper-intermediate-roll bending cylinders 750, 750B, and 751, and the acting position of the output force of the two upper-intermediate-roll bearing-housing backlash elimination cylinders 771 approximately match the center position of the bearing 790.
- the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
- the output force of the upper-intermediate-roll bending cylinders 750, 750B, and 751 is caused to act on an upper-intermediate-roll bearing-housing flange part 822AB in FIG. 9 as roll bending force.
- the length of the upper-intermediate-roll bearing-housing flange part 822AB is defined as L CB .
- the axial positions of the second and subsequent upper-intermediate-roll bending cylinders 750B are not particularly limited.
- One or more second and subsequent upper-intermediate-roll bending cylinders 750B can be arranged on the axially-outer side of the axially-outer upper-intermediate-roll bending cylinder 750, one or more second and subsequent upper-intermediate-roll bending cylinders 750B can be arranged on the axially-inner side of the axially-inner upper-intermediate-roll bending cylinder 750, and so on.
- the entry side and the exit side in FIG. 9 can be reversed, and the upper-intermediate-roll bending cylinders 750 and the upper-intermediate-roll bending cylinder 750B can be arranged on the exit side.
- the number of upper-intermediate-roll bending cylinders 750B is not particularly limited, and one or more upper-intermediate-roll bending cylinders 750B can be provided.
- one or more cylinders with specifications similar to those of the upper-intermediate-roll bending cylinder 750B can be added on the entry side and the exit side.
- the rolling mill according to the present embodiment illustrated in FIG. 10 corresponds to the rolling mill according to the first embodiment, but is different in that it further includes, on the rolled material 5 exit side, upper-intermediate-roll bending cylinders 751C (fourth cylinders) each of which is, on the drive side, at a position on an axially-outer side of, and is, on the work side, at a position on an axially-inner side of the two rolled material 5 entry-side upper-intermediate-roll bending cylinders 750 when viewed in the rolling direction.
- the upper-intermediate-roll bending cylinders 751C are arranged to apply bending force toward the increase side.
- the shift amount of the bearing 790 is defined as L s , and L s is divided into sections A and B.
- TABLE 4 illustrates a relation between the bearing-center position and the state of driving of each cylinder. The intersection position of the roll-axis line and a line linking e1 and d2 is the boundary between the section B and the section A.
- the axially-outer upper-intermediate-roll bending cylinder 750,e1 and upper-intermediate-roll bending cylinder 751C,d1 are driven at output force obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient ⁇ d1
- the upper-intermediate-roll bending cylinder 751,d2 is driven at output force obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient ⁇ d2.
- the axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder 771,g1 is driven at output force obtained by multiplying the required backlash elimination pressing force Pg by the predetermined coefficient ⁇ 1
- the axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder 771,g2 is driven at output force obtained by multiplying the required backlash elimination pressing force Pg by the predetermined coefficient ⁇ 2.
- the upper-intermediate-roll bending cylinder 750,e1 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient ⁇ e1
- an upper-intermediate-roll bending cylinder 750,e2 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient ⁇ e2
- the upper-intermediate-roll bending cylinder 751,d2 is driven.
- coefficients ⁇ e1, ⁇ e2, ⁇ d1, and ⁇ d2 for each section need not be the same values, but are set to different values as appropriate for each section such that the acting position of the output force of the four upper-intermediate-roll bending cylinders 750,e1, 750,e2, 751C,d1, and 751,d2 approximately matches the center position of the bearing 790.
- coefficients ⁇ 1 and ⁇ 2 for each section of the upper-intermediate-roll bearing-housing backlash elimination cylinders 771,g1 and 771,g2 need not be the same values, but are set to different values as appropriates for each section such that the acting position of the output force of the upper-intermediate-roll bearing-housing backlash elimination cylinders 771,g1 and 771,g2 approximately matches the center position of the bearing 790 or becomes as close to the center position of the bearing 790 as possible.
- the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
- one or more fourth cylinders that further apply bending force vertically to the bearing 790 to cause the roll to perform bending are further included at positions on an axially-outer side of the one first cylinder provided on the opposite exit side, and one of the two entry-side first cylinders is arranged between the first cylinder and the fourth cylinders that are provided on the opposite side when the rolling mill is viewed in the rolling direction. Also because of this, the area within which the bending force can be caused to act can be widened in the axial direction, and the shift amount can be increased.
- the axial positions of the second and subsequent upper-intermediate-roll bending cylinders 751C are not particularly limited.
- One or more upper-intermediate-roll bending cylinders 751C can be arranged between the upper-intermediate-roll bending cylinder 751C and the upper-intermediate-roll bending cylinder 751, one or more upper-intermediate-roll bending cylinders 751C can be arranged on the axially-inner side of the upper-intermediate-roll bending cylinder 751, and so on.
- the entry side and the exit side in FIG. 10 can be reversed, and the upper-intermediate-roll bending cylinders 750 and the upper-intermediate-roll bending cylinder 751C can be arranged on the entry side.
- the number of the upper-intermediate-roll bending cylinders 751C is not particularly limited, and one or more upper-intermediate-roll bending cylinders 751C can be provided.
- the upper-intermediate-roll bending cylinders 751C can be added on the entry side and the exit side.
- the rolling mill according to a fifth embodiment of the present invention is explained by using FIG. 11 .
- the rolling mill according to the present embodiment illustrated in FIG. 11 corresponds to the rolling mill according to the first embodiment illustrated in FIG. 5 , but is different in that the upper-work-roll bending cylinders 742 and 743 and the lower-work-roll bending cylinders 746 and 747 that apply pressing force toward the decrease side are omitted.
- the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
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Abstract
Description
- The present invention relates to a rolling mill.
-
Patent Document 1 describes one example of rolling mills that can prevent occurrence of extreme offset loads on bearings, and make it possible to attempt to extend the service life of the bearings, increase the roll shift amount, and in turn improve the capability of correcting the shape of a rolled material. In this document, in order for the resultant force of bending force that acts on a bearing of a rolling roll to always act on the lengthwise center position of the bearing, 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 proximate to the lengthwise center of the bearing is set high, and the hydraulic pressure of a cylinder not proximate 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. - Patent Document 1:
JP-1988-055369-B - There is a known rolling mill that has a shift functionality of moving rolling rolls in the roll-axis directions, and a bending functionality of causing pressurizing force to act on bearings of the rolls in a direction perpendicular to the axes, and controls the shape of a rolled material by controlling related action between movements of the rolls and bending force of the rolls.
- In such a rolling mill, if an offset load acts on a bearing as a result of changes in the positions of the bearing and a bending cylinder depending on the position of a shifted roll, the lifetime of the bearing becomes shorter in some cases, and this is particularly noticeable when the shift amount of the roll is large.
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Patent Document 1 describes one example of a technology for suppressing offset loads to act on bearings, and extending the lifetime of the bearings. InPatent Document 1, 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. - The rolling mill requires a large number of bending cylinders according to shifting of rolls, and furthermore requires a large number of mechanisms for adjusting pressing force of the cylinders. For example, in
Patent Document 1, eight cylinders and at least four adjustment mechanisms are required per bearing. Since the number of components of such a rolling mill increases, there is room for improvement in terms of simplification of the structure. - An object of the present invention is to provide a rolling mill having a structure that can reduce offset loads on bearings even with a simple structure as compared to conventional rolling mills.
- The present invention includes plurality of means for solving the problem described above, and one example thereof is 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 three or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, in which the bearing and the first cylinders are provided on each a drive side and an work side of the roll, two first cylinders among the first cylinders are provided in the roll-axis direction on the exit side or entry side in a rolling direction, one first cylinder among the first cylinders is provided on a side that is one of the exit side and the entry side in the rolling direction, and that is opposite to a side provided with the two first cylinders, and the first cylinder on the opposite side is positioned between the two first cylinders when viewed from the exit side or entry side in the rolling direction.
- According to the present invention, offset loads on bearings can be reduced even with a simple structure as compared to conventional rolling mills. Problems, configurations, and advantages other than those described above become apparent from the following explanation of embodiments.
-
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FIG. 1 is a figure illustrating an overview of a rolling facility including a rolling mill according to a first embodiment of the present invention. -
FIG. 2 is a front view for explaining an overview of the rolling mill according to the first embodiment. -
FIG. 3 is a figure illustrating part of a cross-sectional view taken along A-A' inFIG. 2 . -
FIG. 4 is a figure illustrating part of a cross-sectional view taken along B-B' inFIG. 2 . -
FIG. 5 is a plan view for explaining details of an intermediate-roll portion of the rolling mill according to the first embodiment. -
FIG. 6 is a figure for explaining the pressing force of a second cylinder in a case where only an axially-inner upper-intermediate-roll bearing-housing backlash elimination cylinder on the drive side of the rolling mill according to the first embodiment is driven. -
FIG. 7 is a figure for explaining the pressing force of a second cylinder in a case where only an axially-outer upper-intermediate-roll bearing-housing backlash elimination cylinder on the drive side of the rolling mill according to the first embodiment is driven. -
FIG. 8 is a plan view for explaining details of an intermediate-roll portion of the rolling mill according to a second embodiment of the present invention. -
FIG. 9 is a plan view for explaining details of an intermediate-roll portion of the rolling mill according to a third embodiment of the present invention. -
FIG. 10 is a plan view for explaining details of an intermediate-roll portion of the rolling mill according to a fourth embodiment of the present invention. -
FIG. 11 is a plan view for explaining details of an intermediate-roll portion of the rolling mill according to a fifth embodiment of the present invention. - Hereinafter, embodiments of a rolling mill according to the present invention are explained by using the figures.
- A first embodiment of a rolling mill according to the present invention is explained by using
FIG. 1 to FIG. 5 .FIG. 1 is a figure illustrating an overview of a rolling facility including a rolling mill according to the present first 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' inFIG. 2 .FIG. 4 is a figure illustrating part of a cross-sectional view taken along B-B' inFIG. 2 .FIG. 5 is a plan view for explaining details of an intermediate-roll portion. - First, the overview of the rolling facility including the rolling mill according to the present embodiment is explained by using
FIG. 1 . - As illustrated in
FIG. 1 , arolling facility 1 has: a plurality of rolling mills that perform hot rolling of a rolledmaterial 5 into a strip; and acontroller 80. The rolling mills include seven stands, which are afirst stand 10, asecond stand 20, athird stand 30, afourth stand 40, afifth stand 50, asixth stand 60 and aseventh stand 70, from the rolledmaterial 5 entry side. Each the first stand 10, thesecond stand 20, thethird stand 30, thefourth stand 40, thefifth stand 50, thesixth stand 60 and theseventh stand 70 in the stands, and a portion of thecontroller 80 that controls the stands correspond to what is called a rolling mill in the present invention. - Note that the
rolling facility 1 is not limited to a facility including seven stands like the one illustrated inFIG. 1 , and can be a facility including at least two stands. - Next, part of the overview of the rolling mill according to the present invention is explained by using
FIG. 2 . Note that whereas theseventh stand 70 illustrated inFIG. 1 is explained as an example inFIG. 2 , the rolling mill according to the present invention can be applied to any stand of thefirst stand 10, thesecond stand 20, thethird stand 30, thefourth stand 40, thefifth stand 50, and thesixth stand 60 illustrated inFIG. 1 . - In
FIG. 2 , theseventh stand 70, which is a rolling mill according to the present embodiment, is a rolling mill including six rolls that roll the rolledmaterial 5, and hashousings 700, thecontroller 80, and a hydraulic device (illustration omitted). - The
housings 700 include: anupper work roll 710 and alower work roll 711; and an upperintermediate roll 720 and a lowerintermediate roll 721 that support theupper work roll 710 and thelower work roll 711 by contacting theupper work roll 710 and thelower work roll 711, respectively. Furthermore, thehousings 700 include anupper backup roll 730 and alower backup roll 731 that support the upperintermediate roll 720 and the lowerintermediate roll 721 by contacting the upperintermediate roll 720 and the lowerintermediate roll 721, respectively. - The
upper work roll 710 in the rolls has, at its axial end portions and on both the drive side and the work side, bearings (omitted for the convenience of illustration) that are shifted in the roll-axis direction together with theupper work roll 710, and receive loads from the roll, and these bearings are supported by upper-work-roll bearinghousings 712. Similarly, thelower work roll 711 also has bearings (illustration omitted) at its axial end portions and on both the drive side and the work side, and these bearings are supported by lower-work-roll bearinghousings 713. - In the present embodiment, the
upper work roll 710 is configured to be shifted in the roll-axis direction by ashift cylinder 715 like the one illustrated inFIG. 3 via a work-side upper-work-roll bearing housing 712. Similarly, thelower work roll 711 also is configured to be shifted in the roll-axis direction by ashift cylinder 716 like the one illustrated inFIG. 3 via a work-side lower-work-roll bearing housing 713. - The upper
intermediate roll 720 has bearings 790 (seeFIG. 5 ) at its axial end portions and on both the drive side and the work side, and thesebearings 790 are supported by upper-intermediate-roll bearinghousings intermediate roll 721 also has bearings (illustration omitted) at its axial end portions and on both the drive side and the work side, and these bearings are supported by lower-intermediate-roll bearinghousings - In addition, the upper
intermediate roll 720 is configured to be shifted in the roll-axis direction by ashift cylinder 725 like the one illustrated inFIG. 3 via the drive-side upper-intermediate-roll bearing housing 722A. Similarly, the lowerintermediate roll 721 also is configured to be shifted in the roll-axis direction by ashift cylinder 726 like the one illustrated inFIG. 3 via the drive-side lower-intermediate-roll bearing housing 723A. - Returning to
FIG. 2 , an entry-side fixation member 702 is fixed to the rolledmaterial 5 entry-side housing 700, and on the rolledmaterial 5 exit side, an exit-side fixation member 703 is fixed to the exit-side housing 700 such that the exit-side fixation member 703 becomes opposite to the entry-side fixation member 702. - In the
seventh stand 70, as illustrated inFIG. 2 andFIG. 4 , on each the work side and the drive side, upper-work-roll bending cylinders 740 provided to a work-rollbending block part 714 of the entry-side fixation member 702, an upper-work-roll bending cylinder 742 provided to an upper-intermediate-rollbending block part 727, and upper-work-roll bending cylinders side fixation member 703 support the upper-work-roll bearing housing 712, and, by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing of theupper work roll 710 to cause theupper work roll 710 to perform bending. - Similarly, as illustrated in
FIG. 2 andFIG. 4 , on each the work side and the drive side, lower-work-roll bending cylinders side fixation member 702, and lower-work-roll bending cylinders side fixation member 703 support the lower-work-roll bearing housing 713, and, by driving these cylinders as appropriate, it is possible to apply bending force vertically to the bearing of thelower work roll 711 to cause thelower work roll 711 to perform bending. - Regarding the upper
intermediate roll 720, on each the work side and the drive side, upper-intermediate-roll bending cylinders 750 provided to the upper-intermediate-rollbending block part 727 of the entry-side fixation member 702, and an upper-intermediate-roll bending cylinder 751 provided to the upper-intermediate-rollbending block part 727 of the exit-side fixation member 703 support the upper-intermediate-roll bearing housing bearing 790 to cause the upperintermediate roll 720 to perform bending. In addition, the upper-intermediate-rollbending block part 727 is provided with the upper-work-roll bending cylinders upper work roll 710 to perform bending. - Regarding the lower
intermediate roll 721 also, on each the work side and the drive side, lower-intermediate-roll bending cylinders 752 provided to a lower-intermediate-rollbending block part 728 of the entry-side fixation member 702, and a lower-intermediate-roll bending cylinder 753 provided to the lower-intermediate-rollbending block part 728 of the exit-side fixation member 703 support the lower-intermediate-roll bearing housing bearing 790 to cause the lowerintermediate roll 721 to perform bending. In addition, the lower-intermediate-rollbending block part 728 is provided with the lower-work-roll bending cylinders lower work roll 711 to perform bending. - The upper-work-
roll bending cylinders 740 and 741 (first cylinders) in these cylinders are arranged such that bending force is applied to the bearings of theupper work roll 710, which contacts the rolledmaterial 5, toward the vertical increase side (away from the rolled material), to thereby cause theupper work roll 710 to perform bending. In addition, the upper-work-roll bending cylinders 742 and 743 (fifth cylinders) are arranged such that bending force is applied to the bearings toward the vertical decrease side (in the direction toward the rolled material), which is a direction opposite to the bending force applied by the upper-work-roll bending cylinders upper work roll 710 to perform bending. - Similarly, the lower-work-
roll bending cylinders 744 and 745 (first cylinders) are arranged such that bending force is applied to the bearings of thelower work roll 711 that contacts the rolledmaterial 5 toward the vertical increase side, to thereby cause thelower work roll 711 to perform bending. In addition, the lower-work-roll bending cylinders 746 and 747 (fifth cylinders) are arranged such that bending force is applied to the bearings toward the decrease side, which is a direction opposite to the bending force applied by the lower-work-roll bending cylinders lower work roll 711 to perform bending. - The upper-intermediate-
roll bending cylinders 750 and 751 (first cylinders) are arranged such that bending force is applied to thebearings 790 of the upperintermediate roll 720 toward the vertical increase side, to thereby cause the roll to perform bending. - The lower-intermediate-
roll bending cylinders 752 and 753 (first cylinder) are arranged such that bending force is applied to thebearings 790 of the lowerintermediate roll 721 toward the vertical increase side, to thereby cause the roll to perform bending. - As illustrated in
FIG. 2 ,FIG. 3 , andFIG. 4 , for the purpose of preventing backlashes, the entry-side fixation member 702 on the rolledmaterial 5 entry side 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 theupper work roll 710 via liners (illustration omitted) of the upper-work-roll bearing housings 712. Similarly, 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 thelower work roll 711 in the rolling direction via liners of the lower-work-roll bearing housings 713. Thereby, desired force can be applied to the work roll or the like in a direction orthogonal to the roll-axis direction. - In addition, as illustrated in
FIG. 2 ,FIG. 3 , andFIG. 4 , for the purpose of preventing backlashes, the exit-side fixation member 703 on the rolledmaterial 5 exit side is provided with upper-intermediate-roll bearing-housing backlash elimination cylinders 771 (second cylinders) such that horizontal force, that is, pressing force in a direction opposite to the rolling direction, is applied to the upperintermediate roll 720 via liners of the upper-intermediate-roll bearing housings 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 lowerintermediate roll 721 in a direction opposite to the rolling direction via liners of the lower-intermediate-roll bearing housings - Returning to
FIG. 2 , theupper backup roll 730 has bearings (illustration omitted) at its axial end portions and on both the drive side and the work side, and these bearing are supported by upper-backuproll bearing housings 732. Similarly, thelower backup roll 731 also has bearings (illustration omitted) at its axial end portions and on both the drive side and the work side, and these bearings are supported by lower-backuproll bearing housings 733. - In addition, as illustrated in
FIG. 2 , the entry-side housing 700 is provided with upper-backup roll bearing-housingbacklash elimination cylinders 780 such that horizontal force is applied to theupper backup roll 730 via the upper-backuproll bearing housings 732. Similarly, the entry-side housing 700 is provided with lower-backup roll bearing-housingbacklash elimination cylinders 782 such that horizontal force is applied to thelower backup roll 731 via the lower-backuproll 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 theupper work roll 710 and thelower work roll 711. This hydraulic device is connected to thecontroller 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. - Next, configurations related to the upper
intermediate roll 720 in the rolls are explained by usingFIG. 5 . Note that theupper work roll 710, thelower work roll 711, and the lowerintermediate roll 721 also can have configurations equivalent to those of the upperintermediate roll 720. Their configurational details are approximately the same as those of the upperintermediate roll 720, and therefore explanations thereof are omitted. - The present invention is suitably applied to the upper
intermediate roll 720 like the one illustrated inFIG. 5 or the lowerintermediate roll 721. - As illustrated in
FIG. 5 , in the present embodiment, on the rolledmaterial 5 entry side, and on each the drive side and the work side of the upperintermediate roll 720, two upper-intermediate-roll bending cylinders 750 are provided in the roll-axis direction. In addition, on the rolledmaterial 5 exit side, one upper-intermediate-roll bending cylinder 751 is provided. The upper-intermediate-roll bending cylinder 751 provided on the rolledmaterial 5 exit side in the cylinders is arranged such that it is positioned between the two upper-intermediate-roll bending cylinders 750 provided on the opposite entry side when viewed in the rolling direction. - Furthermore, the axially-outer upper-intermediate-
roll bending cylinder 750 in the two upper-intermediate-roll bending cylinders 750 provided on the entry side on each the drive side and the work side is arranged outside an area within which the center of thebearing 790 is shifted when the upperintermediate roll 720 is shifted in the axial direction by theshift cylinder 725 via ashift mechanism 725A. - In addition, in the present embodiment, the upper-intermediate-roll bearing-housing
backlash elimination cylinders 771 arranged on the rolledmaterial 5 exit side are arranged on both axial sides of the one upper-intermediate-roll bending cylinder 751 provided on the same exit side when viewed in the rolling direction. - Particularly, desirably, an acting position of the output force of the three upper-intermediate-
roll bending cylinders backlash elimination cylinders 771 are arranged such that each of them is kept within LB/4 on the axially-outer side of the axial center of thebearing 790, and within LB/4 on the axially-inner side of the axial center of thebearing 790, that is, within LB/2 from the axial center of thebearing 790, when the axial length of thebearing 790 is defined as LB, or the output force is controlled in such a manner. - More desirably, the intermediate position of the two entry-side upper-intermediate-
roll bending cylinders 750, and the intermediate position of the two exit-side upper-intermediate-roll bearing-housingbacklash elimination cylinders 771 are the same with each other or proximate to each other desirably. In this case, more desirably, the axial position of the exit-side upper-intermediate-roll bending cylinder 751 is positioned at the intermediate position of the axial positions of the two entry-side upper-intermediate-roll bending cylinders 750, that is, at the intermediate position between the two upper-intermediate-roll bearing-housingbacklash elimination cylinders 771. - In the present embodiment, on each the drive side and the work side, the upper-work-
roll bending cylinder 742 arranged on the rolledmaterial 5 entry side is provided at an axial position between the two upper-intermediate-roll bending cylinders 750 that are provided in the axial direction. - In contrast to this, on each the drive side and the work side, the upper-work-
roll bending cylinder 743 arranged on the rolledmaterial 5 exit side is provided at a position on the axially-inner side of the upper-intermediate-roll bending cylinder 751. - Next, details of drive control of the upper-intermediate-
roll bending cylinders backlash elimination cylinders 771 according to the present embodiment are explained with reference toFIG. 5 and TABLE 1. The drive control of these is executed by thecontroller 80 that performs drive control of the hydraulic device. - First, the
controller 80 is configured to perform control such that when bending of the roll is performed, the difference between the total output force of the two first cylinders, and the output force of the first cylinder provided on the opposite side is within a predetermined range. Preferably, the resultant force of the roll bending cylinders is caused to act on the roll-axis line. In addition, thecontroller 80 is configured to drive any one of or both of the two upper-intermediate-roll bending cylinders 750 arranged on the entry side, and drive the first cylinder provided on the opposite side, according to the shift position of the upperintermediate roll 720. -
- When the intermediate roll shifts within Ls, the bearing center exists in any of sections A, B, and C illustrated in
FIG. 5 . When the bearing center exists in the section C, on the drive side, the axially-inner cylinder in the entry-side upper-intermediate-roll bending cylinders 750 is not driven, but the axially-outer upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven. - The total output force of the driven cylinders on the entry side and the exit side acts on a position near the intersection of the roll-axis line and a line linking the driven cylinders. The acting position of the total output force of the cylinders is arranged such that it is kept within LB/4 on the axially-outer side of the axial center of the
bearing 790, and within LB/4 on the axially-inner side of the axial center of thebearing 790, that is, within LB/2 from the axial center of thebearing 790. - Accordingly, the boundary between the section A and the section B exists at a position within LB/4 on the axially-outer side of the intersection of the roll-axis line and a straight line linking the axially-inner entry-side upper-intermediate-
roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751. - In addition, the boundary between the section B and the section C exists at a position within LB/4 on the axially-inner side of the intersection of the roll-axis line and a straight line linking the axially-outer entry-side upper-intermediate-
roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751. - On the work side, the axially-outer cylinder in the entry-side upper-intermediate-
roll bending cylinders 750 is not driven, but the axially-inner upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven. - When the bearing center exists in the section A, on the drive side, the axially-outer cylinder in the entry-side upper-intermediate-
roll bending cylinders 750 is not driven, but the axially-inner upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven. - On the work side, the axially-inner cylinder in the entry-side upper-intermediate-
roll bending cylinders 750 is not driven, but the axially-outer upper-intermediate-roll bending cylinder 750 and the exit-side upper-intermediate-roll bending cylinder 751 are driven. - When the bearing center exists in the section B, on each the drive side and the work side, the output force of both of the entry-side upper-intermediate-
roll bending cylinders 750 is made 1/2 such that the total becomes the same as the output force of the exit-side upper-intermediate-roll bending cylinder, and the exit-side upper-intermediate-roll bending cylinder 751 is driven similarly to the cases of the sections A and C. - Regarding the upper-intermediate-roll bearing-housing
backlash elimination cylinders 771, in the case of the section C in TABLE 1, on the drive side, the axially-inner cylinder is not driven, but only the axially-outer cylinder is driven. On the work side, the axially-outer cylinder is not driven, but the axially-inner cylinder is driven. - In addition, in the case of the section A in TABLE 1, on the drive side, the axially-outer cylinder is not driven, but only the axially-inner cylinder is driven. On the work side, the axially-inner cylinder is not driven, but the axially-outer cylinder is driven.
- In the case of the section B in TABLE 1, on each the drive side and the work side, both of the two cylinders are driven at output force which is 1/2 of required output force.
- Whereas the output force of the upper-intermediate-
roll bending cylinders backlash elimination cylinders 771 have three states, which are the ON state, 1/2 ON state and OFF state, in the case explained in the example described above, by separately and more finely adjusting the output force of each upper-intermediate-roll bending cylinder backlash elimination cylinder 771, it is possible to cause the bending force to be applied onto the axial center of the bearing 790 more accurately. Hereinafter, one example of different output control is explained. - Hereinafter, only the drive side is explained as an example. It is possible to deal with the work side by reversing the positional relation in the axial direction, and details thereof are omitted.
- When the bearing center exists in the section C, the axially-outer upper-intermediate-
roll bending cylinder 750 is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 750 by α1, the axially-inner upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying the total output force by α2, the total of α1 and α2 is 1, and α1 and α2 are adjusted such that the acting position of the total output force is almost at the bearing center. The two upper-intermediate-roll bending cylinders 750 are driven along with the upper-intermediate-roll bending cylinder 751 in this manner. Alternatively, α1 is set to 1, α2 is set to 0, and the axially-outer upper-intermediate-roll bending cylinder 750 and the upper-intermediate-roll bending cylinder 751 are driven. - In addition, the axially-outer upper-intermediate-roll bearing-housing
backlash elimination cylinder 771 is driven at output force obtained by multiplying required output force by a predetermined coefficient γ1, and the axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven at output force obtained by multiplying the required output force by a predetermined coefficient γ2. Here, the total of γ1 and γ2 is 1, and γ1 and γ2 are adjusted such that the acting position of the total output force is almost at the bearing center. Alternatively, only the axially-outer upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven. - When the bearing center exists in the section A, the axially-outer upper-intermediate-
roll bending cylinder 750 is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 750 by α1, the axially-inner upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying the total output force by α2, the total of α1 and α2 is 1, and α1 and α2 are adjusted such that the acting position of the total output force is almost at the bearing center. The two upper-intermediate-roll bending cylinders 750 are driven along with the upper-intermediate-roll bending cylinder 751 in this manner. Alternatively, α1 is set to 0, α2 is set to 1, and the axially-inner upper-intermediate-roll bending cylinder 750 and the upper-intermediate-roll bending cylinder 751 are driven. - In addition, the axially-outer upper-intermediate-roll bearing-housing
backlash elimination cylinder 771 is driven at output force obtained by multiplying required output force by the predetermined coefficient γ1, and the axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven at output force obtained by multiplying the required output force by the predetermined coefficient γ2. Here, the total of γ1 and γ2 is 1, and γ1 and γ2 are adjusted such that the acting position of the total output force is almost at the bearing center. Alternatively, only the axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven. - When the bearing center exists in the section B, the axially-outer upper-intermediate-
roll bending cylinder 750 is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 750 by α1, the axially-inner upper-intermediate-roll bending cylinder 750 is driven at output force obtained by multiplying the total output force by α2, the total of α1 and α2 is 1, and α1 and α2 are adjusted such that the acting position of the total output force is almost at the bearing center. The two upper-intermediate-roll bending cylinders 750 are driven along with the upper-intermediate-roll bending cylinder 751 in this manner. - In addition, the axially-outer upper-intermediate-roll bearing-housing
backlash elimination cylinder 771 is driven at output force obtained by multiplying required output force by the predetermined coefficient γ1, and the axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven at output force obtained by multiplying the required output force by the predetermined coefficient γ2. Here, the total of γ1 and γ2 is 1, and γ1 and γ2 are adjusted such that the acting position of the total output force is almost at the bearing center. - When the two upper-intermediate-roll bearing-housing
backlash elimination cylinders 771 are actuated as in TABLE 1, the actuation position can be kept within LB/2 from the axial center of thebearing 790 when the bearing center exists in the section B, but the actuation position cannot be kept within LB/2 from the axial center of thebearing 790 when the bearing center exists in the section C or the section A in some cases. In contrast to this, by adjusting γ1 and γ2, it becomes possible to keep the actuation position within LB/2 from the axial center of thebearing 790 in each of the cases of the sections A, B, and C. - Note that the values of α1 and α2 for each area need not be the same values, and can be set to different values as appropriate for each area such that the acting position of the total of the output force of the two upper-intermediate-
roll bending cylinders 750 and the output force of the upper-intermediate-roll bending cylinder 751 approximately matches the center position of thebearing 790. - In addition, the values of γ1 and γ2 for each area need not be the same values, and can be set to different values as appropriate for each area such that the acting position of the output force of the two upper-intermediate-roll bearing-housing
backlash elimination cylinders 771 approximately matches the center position of thebearing 790. - Next, advantages of the present embodiment are explained.
- The rolling mill according to the first embodiment of the present invention mentioned above includes: a roll that is shifted in the axial direction; a bearing that is shifted in the roll-axis direction along with the roll, and receives a load from the roll; and three or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, and the bearing and the first cylinders are provided on each the drive side and the work side. Two first cylinders in the first cylinders are provided in the roll-axis direction on the rolled
material 5 entry side or exit side, one first cylinder in the first cylinders is provided on a side which is one of the rolledmaterial 5 exit side and entry side, and is opposite to a side provided with the two first cylinders, and the first cylinder on the opposite side is positioned between the two first cylinders when viewed in the rolling direction. - In this manner, by arranging the three first cylinders in total in a staggered manner on the rolled
material 5 entry side and exit side, it is possible to change first cylinders to be driven as appropriate according to the shift position of the roll, and it is thereby possible to realize a structure that can cause the resultant bending force to act on a position near the lengthwise middle portion of the bearing even with a simple structure as compared to conventional rolling mills. Accordingly, offset loads on the bearing can be reduced even with a simple structure. - In addition, since one or more first cylinders in the two first cylinders are arranged outside an area within which the center of the bearing is shifted, it is possible to cause the resultant force of the bending force of the first cylinders to act on a position near the lengthwise middle portion of the bearing more accurately and surely, and it is possible to reduce offset loads on the bearing more surely.
- Furthermore, since second cylinders that apply pressing force to the
bearing 790 in the rolling direction or in a direction opposite to the rolling direction are further included in one of the entry-side fixation member 702 and the exit-side fixation member 703 that are fixed to thehousings 700 at least on either the rolledmaterial 5 entry-side or exit-side, and are provided with the first cylinders. Thereby, it is possible to prevent the bearings and the first cylinders from moved in the rolling direction at the time of biting of the top of the rolledmaterial 5. Thereby, an advantage of preventing the bending acting position from moved can be attained. That is, it is possible to suppress the movement of the bearings in the rolling direction in a state in which the bending force is acting thereon. Accordingly, a slip does not occur at portions that are pressed by the first cylinders, and it is possible to suppress damages to the first cylinders and wear on the pressed side, and to keep the bending precision high. - In addition, since the second cylinders that apply pressing force to the bearing in a rolling direction or in a direction opposite to the rolling direction are further included on either the entry side or the exit side, and the second cylinders are arranged on both of axial sides of the first cylinder when the rolling mill is viewed in the rolling direction, it becomes easier to cause the pressing force of the second cylinders to act on a position near the lengthwise middle portion of the bearing, and it is possible to make it more difficult for the bearings and the first cylinders to shift in the rolling direction at the time of biting of the rolled material. Accordingly, the bending precision can be kept higher.
- An advantage attained by causing the pressing force of the second cylinders to act on a position near the lengthwise middle portion of the bearing is as follows.
FIG. 6 illustrates a case where the pressing force of a second cylinder acts on a position near the lengthwise middle portion of the bearing in a case where only the drive-side axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven. - As illustrated in
FIG. 6 , if it is defined that the force in the rolling direction that acts on the bearing from the roll is Fd, the pressing force of the second cylinder is Fg2, and the outer reaction force and inner reaction force generated to liners of the upper-intermediate-roll bearing housing 722A and the upper-intermediate-rollbending block part 727 are F1 and F2, respectively, there is a relation of Fg2 = Fd + F1 + F2. If any of F1 and F2 becomes 0, the liners are out of contact, and this is not preferable. Here, Fg2 is generated near the Fd-acting position, and therefore, Fg2 can be made a relatively small value. That is, the pressing force of the second cylinder can be reduced. - In contrast to this,
FIG. 7 illustrates a case where the pressing force of a second cylinder acts on a position away from a position near the lengthwise middle part of the bearing in a case where only the drive-side axially-outer upper-intermediate-roll bearing-housingbacklash elimination cylinder 771 is driven. - The pressing force Fg1 of the second cylinder has a relation of Fg1 = Fd + F1 + F2, similarly. In order for F2 to be not 0, Fg1 inevitably becomes a large value for the balance of moments. This makes it necessary to use larger second cylinders, and it becomes structurally difficult to house such large cylinders in the upper-intermediate-roll
bending block part 727. However, as inFIG. 6 , by causing the pressing force of the second cylinders to act on a position near the lengthwise middle portion of the bearing, the output force required of the second cylinders can be reduced, and the size of the cylinders can be reduced. Thereby, they can be housed in the upper-intermediate-rollbending block part 727. - Furthermore, the
controller 80 that drives the first cylinders is further included, and thecontroller 80 is configured to drive any one first cylinder in the two first cylinders and drive the first cylinder provided on the opposite side when bending of the roll is performed and also the center of the bearing is arranged on the outer side of X, which is defined as an intersection of the roll-axis line and a straight line linking the outer first cylinder and the first cylinder provided on the opposite side, or is arranged on the inner side of Y, which is defined as an intersection of the roll-axis line and a straight line linking the inner first cylinder and the first cylinder provided on the opposite side. Thereby, it is possible to cause the resultant bending force to act on a position near the lengthwise middle portion of the bearing by two first cylinders per bearing more accurately, and it is possible to suppress application of offset loads onto the bearing more surely. - In addition, the
controller 80 that drives the first cylinders is further included, and thecontroller 80 is configured to perform control such that when bending of the roll is performed, the difference between the total output force of the two first cylinders and the output force of the first cylinder provided on the opposite side is within a predetermined range. Thereby, it is possible to cause almost the same bending force to act on the entry side and the exit side of the bearing, and it is possible to keep the roll stably. - Furthermore, the upper
intermediate roll 720 and the lowerintermediate roll 721 typically have large shift amounts. In view of this, theupper work roll 710 and thelower work roll 711 that contact the rolledmaterial 5, and the upperintermediate roll 720 and the lowerintermediate roll 721 that contact theupper work roll 710 and thelower work roll 711 are included, and the roll is used as the upperintermediate roll 720 and the lowerintermediate roll 721. Thereby, it is possible to realize a structure that can cause the resultant bending force to act on a position near the lengthwise middle portion of the bearing by a simple structure even in a case where the shift amounts are large. - In addition, the entry-
side fixation member 702 and the exit-side fixation member 703 that are fixed to thehousings 700 at least on either the rolledmaterial 5 entry-side or exit-side and are provided with the first cylinders, and the fifth cylinders that apply, to the bearings of theupper work roll 710 and thelower work roll 711 that contact the rolledmaterial 5, bending force in a direction opposite to the bending force applied by the first cylinders to cause theupper work roll 710 and thelower work roll 711 to perform bending are further included. Thereby, it is possible to provide the fifth cylinders also to the same members as the first cylinders, and it is possible to attempt to save spaces. - The rolling mill according to a second embodiment of the present invention is explained by using
FIG. 8 . The same configurations as the first embodiment are denoted with the same reference characters, and explanations thereof are omitted. The same applies also to the following embodiments. - As illustrated in
FIG. 8 , in the rolling mill according to the present embodiment, in a manner opposite to that of the rolling mill according to the first embodiment, one upper-intermediate-roll bending cylinder 750A (first cylinder) is provided in the roll-axis direction on the rolledmaterial 5 entry side, and two upper-intermediate-roll bending cylinders 751A (first cylinders) are provided on the rolledmaterial 5 exit side. - The upper-intermediate-
roll bending cylinder 750A provided on the rolledmaterial 5 entry side in the upper-intermediate-roll bending cylinders is arranged such that it is positioned between the two upper-intermediate-roll bending cylinders 751A provided on the opposite exit side when viewed in the rolling direction. - In addition, in the present embodiment, an upper-intermediate-roll bearing-housing
backlash elimination cylinder 771A arranged on the rolledmaterial 5 exit side is arranged, in the axial direction, between the two upper-intermediate-roll bending cylinder 751A provided on the same exit side when viewed in the rolling direction. - In the present embodiment, the axial positions of the upper-intermediate-
roll bending cylinder 750A provided on the entry side and the exit-side upper-intermediate-roll bearing-housingbacklash elimination cylinder 771A are desirably the same. -
- The boundary between the section B and the section C exists at a position within LB/4 on the axially-inner side of the intersection of the entry-side upper-intermediate-
roll bending cylinder 750A and the axially-outer exit-side upper-intermediate-roll bending cylinder 751A. When the bearing center exists in the section C, on the drive side, the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-inner cylinder in the exit-side upper-intermediate-roll bending cylinders 751A is not driven, but the axially-outer cylinder is driven. On the work side, the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-outer cylinder in the exit-side upper-intermediate-roll bending cylinders 751A is not driven, but the axially-inner cylinder is driven. - The boundary between the section A and the section B exists at a position within LB/4 on the axially-outer side of the intersection of the entry-side upper-intermediate-
roll bending cylinder 750A and the axially-inner exit-side upper-intermediate-roll bending cylinder 751A. When the bearing center exists in the section A, on the drive side, the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-outer cylinder in the exit-side upper-intermediate-roll bending cylinders 751A is not driven, but the axially-inner cylinder is driven. On the work side, the entry-side upper-intermediate-roll bending cylinder 750A is driven, and the axially-inner cylinder is not driven, but the axially-outer cylinder is driven. - When the bearing center exists in the section B, on each the drive side and the work side, the entry-side upper-intermediate-
roll bending cylinder 750A is driven similarly to the cases of the sections A and C, and the output force of both of the exit-side upper-intermediate-roll bending cylinders 751A is made 1/2 such that the total thereof becomes the same as the output force of the entry-side upper-intermediate-roll bending cylinder. - The upper-intermediate-roll bearing-housing
backlash elimination cylinder 771A is driven no matter which of the sections A, B, and C in TABLE 2 the bearing center exists in. - In other respects, the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
- In the second embodiment of the present invention also in which a second cylinder that applies pressing force to the
bearing 790 in the rolling direction or in a direction opposite to the rolling direction is further included on either the entry side or the exit side, and the second cylinder is arranged between the two first cylinders when the rolling mill is viewed in the rolling direction. Also because of this, advantages almost similar to those of the rolling mill according to the first embodiment mentioned before can be attained. - When the intermediate roll shifts within Ls, the bearing center exists in any of sections A, B, and C illustrated in
FIG. 8 . By arranging the second cylinder between the first cylinders in the axial direction when the rolling mill is viewed in the rolling direction, the second cylinder is positioned almost at the intermediate position of Ls. Accordingly, it becomes easier to cause the pressing force of the second cylinder to act on a position near the lengthwise middle portion of the shifted bearing, the output force required of the second cylinder can be reduced, and the size of the cylinder can be reduced. Thereby, it can be housed in the upper-intermediate-rollbending block part 727. Thereby, it becomes possible to make it difficult for the bearing and the first cylinders to shift in the rolling direction at the time of biting of the rolled material, and thus the bending precision can be kept higher. - Similarly to the first embodiment, the axially-outer upper-intermediate-
roll bending cylinder 751A is driven at output force obtained by multiplying total output force of the two upper-intermediate-roll bending cylinders 751A by α1, the axially-inner upper-intermediate-roll bending cylinder 751A is driven at output force obtained by multiplying the total output force by α2, the total of α1 and α2 is 1, and α1 and α2 are adjusted such that the acting position of the total output force is almost at the bearing center. The two upper-intermediate-roll bending cylinders 751A can be driven along with the upper-intermediate-roll bending cylinder 750A in this manner also. - Note that the form illustrated on the drive side in
FIG. 5 can be adopted for the drive side, and also the form illustrated on the work side inFIG. 8 can be adopted for the work side. In addition, conversely, the form illustrated on the drive side inFIG. 8 can be adopted for the drive side, and also the form illustrated on the work side inFIG. 5 can be adopted for the work side. - The rolling mill according to a third embodiment in the present invention is explained by using
FIG. 9 and TABLE 3. - The rolling mill according to the present embodiment illustrated in
FIG. 9 corresponds to the rolling mill according to the first embodiment, but is different in that it includes, between the two rolledmaterial 5 entry-side upper-intermediate-roll bending cylinders 750, an upper-intermediate-roll bending cylinder 750B (third cylinder) that further applies bending force vertically to thebearing 790 to cause the roll to perform bending. Similarly to the upper-intermediate-roll bending cylinders 750, the upper-intermediate-roll bending cylinder 750B is arranged so as to apply bending force toward the increase side. - Next, details of drive control of the upper-intermediate-
roll bending cylinders backlash elimination cylinders 771 according to the present embodiment are explained. - In the present embodiment also, the shift amount of the
bearing 790 is defined as Ls, and Ls is divided into sections A, B, C, and D. TABLE 3 illustrates a relation between the bearing-center position and the state of driving of each cylinder. The intersection position of the roll-axis line and a line linking e1 and d1 is the boundary between the section D and the section C. The intersection position of the roll-axis line and a line linking e3 and d1 is the boundary between the section B and the section A.[TABLE 3] type position acting force section where bearing-center position exists D C B A bending force entry side e1 Pe1 1xPbe α1×Pbe 0×Pbe 0×Pbe e2 Pe2 0×Pbe α2×Pbe α2×Pbe 0×Pbe e3 Pe3 0×Pbe 0×Pbe α3×Pbe 1xPbe Total =Pe1+Pe2+Pe 3 Pbe Pbe Pbe Pbe exit side d1 Pd1 1× Pbd 1× Pbd 1× Pbd 1×Pbd total Pbe+Pbd Pbe+Pbd Pbe+Pbd Pbe+Pbd backlash elimination pressing force axial direction g1 Pg1 γ1×Pg γ1×Pg γ1×Pg γ1×Pg g2 Pg2 γ2×Pg y2xPg y2xPg γ2×Pg total output force =Pg1+Pg2 Pg Pg Pg Pg - When the axial center of the bearing exists in the section D, an axially-outer upper-intermediate-
roll bending cylinder 750,e1 and an upper-intermediate-roll bending cylinder 751,d1 are driven. - When the axial center of the bearing exists in the section C, the axially-outer upper-intermediate-
roll bending cylinder 750,e1 is driven at output force obtained by multiplying required entry-side bending force Pbe by a predetermined coefficient α1, an upper-intermediate-roll bending cylinder 750B,e2 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient α2, and the upper-intermediate-roll bending cylinder 751,d1 is driven. - When the axial center of the bearing exists in the section B, the upper-intermediate-
roll bending cylinder 750B,e2 is driven at output force obtained by multiplying the required entry-side bending force Pbe by the predetermined coefficient α2, and an axially-inner upper-intermediate-roll bending cylinder 750,e3 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient α3, and the upper-intermediate-roll bending cylinder 751,d1 is driven. - When the axial center of the bearing exists in the section A, the axially-inner upper-intermediate-
roll bending cylinder 750,e3 and the upper-intermediate-roll bending cylinder 751,d1 are driven. - No matter which area the axial center of the bearing exists in, the resultant force of the entry-side bending force Pbe and the exit-side bending force Pbd is adjusted such that it becomes bending force required for the roll, and the resultant force is adjusted such that it acts on a position near the axial center of the roll.
- Regarding the output force of the upper-intermediate-roll bearing-housing
backlash elimination cylinders 771, at any location, an axially-outer upper-intermediate-roll bearing-housingbacklash elimination cylinder 771,g1 is driven at output force obtained by multiplying required backlash elimination pressing force Pg by the predetermined coefficient γ1, and an axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771,g2 is driven at output force obtained by multiplying the required backlash elimination pressing force Pg by the predetermined coefficient γ2. - Note that similarly to γ1 and γ2, the values of α1, α2, and α3 for each area need not be the same values, and can be set to different values as appropriate for each area such that the acting position of the output force of the four upper-intermediate-
roll bending cylinders backlash elimination cylinders 771 approximately match the center position of thebearing 790. In addition, it is also possible to use not only e1, but to use e1 and e2 on the entry side in the case of the section D to cause bending force to act on a position near the lengthwise center position of the bearing, and allocation of the output force can be set as appropriate by setting α1, α2, and α3 for each section. - In other respects, the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
- With the rolling mill according to the third embodiment of the present invention also, advantages almost similar to those of the rolling mill according to the first embodiment mentioned before can be attained.
- In addition, since a third cylinder that further applies bending force vertically to the
bearing 790 to cause the roll to perform bending is included between the two first cylinders, an area within which the bending force can be caused to act widens in the axial direction. Accordingly, the shift amount can be increased, and it is possible to cause a load to be applied at the lengthwise center position of the bearing more accurately when the shift amount is small. - Furthermore, the output force of the upper-intermediate-
roll bending cylinders FIG. 9 as roll bending force. The length of the upper-intermediate-roll bearing-housing flange part 822AB is defined as LCB. When the intermediate roll shifts, the bearing also shifts along with its bearing housing. In order to cause roll bending force to act at a position to which the bearing has shifted, the upper-intermediate-roll bearing-housing flange part 822AB is needed for bending cylinders that are driven at the position to which the bearing has shifted. Since bending cylinders to be used are chosen according to the shift position, this gives an advantage of not requiring long LCB even in a case where the shift amount is large, and of not complicating the bearing housing. Problems that a bearing housing becomes long in the axial direction, and large in size, and the structure becomes complicated occur in a case where long LCB is required, but these problems can be avoided. - Note that whereas the one upper-intermediate-
roll bending cylinder 750B is provided in the case explained in the present embodiment, two or more upper-intermediate-roll bending cylinders 750B can be provided. At this time, the axial positions of the second and subsequent upper-intermediate-roll bending cylinders 750B are not particularly limited. One or more second and subsequent upper-intermediate-roll bending cylinders 750B can be arranged on the axially-outer side of the axially-outer upper-intermediate-roll bending cylinder 750, one or more second and subsequent upper-intermediate-roll bending cylinders 750B can be arranged on the axially-inner side of the axially-inner upper-intermediate-roll bending cylinder 750, and so on. - In addition, like the relation between the first embodiment and the second embodiment, the entry side and the exit side in
FIG. 9 can be reversed, and the upper-intermediate-roll bending cylinders 750 and the upper-intermediate-roll bending cylinder 750B can be arranged on the exit side. In this case also, the number of upper-intermediate-roll bending cylinders 750B is not particularly limited, and one or more upper-intermediate-roll bending cylinders 750B can be provided. - Furthermore, one or more cylinders with specifications similar to those of the upper-intermediate-
roll bending cylinder 750B can be added on the entry side and the exit side. - The rolling mill according to a fourth embodiment of the present invention is explained by using
FIG. 10 and TABLE 4. - The rolling mill according to the present embodiment illustrated in
FIG. 10 corresponds to the rolling mill according to the first embodiment, but is different in that it further includes, on the rolledmaterial 5 exit side, upper-intermediate-roll bending cylinders 751C (fourth cylinders) each of which is, on the drive side, at a position on an axially-outer side of, and is, on the work side, at a position on an axially-inner side of the two rolledmaterial 5 entry-side upper-intermediate-roll bending cylinders 750 when viewed in the rolling direction. Similarly to the upper-intermediate-roll bending cylinders 750, the upper-intermediate-roll bending cylinders 751C are arranged to apply bending force toward the increase side. - Next, details of drive control of the upper-intermediate-
roll bending cylinders backlash elimination cylinders 771 according to the present embodiment are explained. - In the present embodiment also, the shift amount of the
bearing 790 is defined as Ls, and Ls is divided into sections A and B. TABLE 4 illustrates a relation between the bearing-center position and the state of driving of each cylinder. The intersection position of the roll-axis line and a line linking e1 and d2 is the boundary between the section B and the section A.[TABLE 4] type position acting force section where bearing-center position exists B A bending force entry side e1 Pe1 1×Pbe αe1×Pbe e2 Pe2 0×Pbe αe2×Pbe total=Pe1+Pe2 Pbe Pbe exit side d1 Pd1 αd1×Pbd 0×Pbd d2 Pd2 αd2×Pbd 1×Pbd total=Pd1+Pd2 Pbd Pbd total Pbe+Pbd Pbe+Pbd backlash elimination pressing force axial direction g1 Pg1 γ1×Pg γ1×Pg g2 Pg2 γ2×Pg y2xPg total output force=Pg1+Pg2 Pg Pg - When the axial center of the
bearing 790 exists in the section B, the axially-outer upper-intermediate-roll bending cylinder 750,e1 and upper-intermediate-roll bending cylinder 751C,d1 are driven at output force obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient αd1, and the upper-intermediate-roll bending cylinder 751,d2 is driven at output force obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient αd2. - Regarding the backlash elimination cylinders, in any section, the axially-outer upper-intermediate-roll bearing-housing
backlash elimination cylinder 771,g1 is driven at output force obtained by multiplying the required backlash elimination pressing force Pg by the predetermined coefficient γ1, and the axially-inner upper-intermediate-roll bearing-housingbacklash elimination cylinder 771,g2 is driven at output force obtained by multiplying the required backlash elimination pressing force Pg by the predetermined coefficient γ2. - When the axial center of the
bearing 790 exists in the section A, the upper-intermediate-roll bending cylinder 750,e1 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient αe1, an upper-intermediate-roll bending cylinder 750,e2 is driven at output force obtained by multiplying the required entry-side bending force Pbe by a predetermined coefficient αe2, and the upper-intermediate-roll bending cylinder 751,d2 is driven. - Note that the coefficients αe1, αe2, αd1, and αd2 for each section need not be the same values, but are set to different values as appropriate for each section such that the acting position of the output force of the four upper-intermediate-
roll bending cylinders 750,e1, 750,e2, 751C,d1, and 751,d2 approximately matches the center position of thebearing 790. - In addition, the coefficients γ1 and γ2 for each section of the upper-intermediate-roll bearing-housing
backlash elimination cylinders 771,g1 and 771,g2 need not be the same values, but are set to different values as appropriates for each section such that the acting position of the output force of the upper-intermediate-roll bearing-housingbacklash elimination cylinders 771,g1 and 771,g2 approximately matches the center position of thebearing 790 or becomes as close to the center position of thebearing 790 as possible. - In other respects, the configuration/action is approximately the same as the configuration/action of the rolling mill according to the first embodiment mentioned before, and details thereof are omitted.
- With the rolling mill according to the fourth embodiment of the present invention also, advantages almost similar to those of the rolling mill according to the first embodiment mentioned before can be attained.
- In addition, one or more fourth cylinders that further apply bending force vertically to the
bearing 790 to cause the roll to perform bending are further included at positions on an axially-outer side of the one first cylinder provided on the opposite exit side, and one of the two entry-side first cylinders is arranged between the first cylinder and the fourth cylinders that are provided on the opposite side when the rolling mill is viewed in the rolling direction. Also because of this, the area within which the bending force can be caused to act can be widened in the axial direction, and the shift amount can be increased. - Note that whereas the one upper-intermediate-
roll bending cylinder 751C is provided in the case explained in the present embodiment, two or more upper-intermediate-roll bending cylinders 751C can be provided. At this time, the axial positions of the second and subsequent upper-intermediate-roll bending cylinders 751C are not particularly limited. One or more upper-intermediate-roll bending cylinders 751C can be arranged between the upper-intermediate-roll bending cylinder 751C and the upper-intermediate-roll bending cylinder 751, one or more upper-intermediate-roll bending cylinders 751C can be arranged on the axially-inner side of the upper-intermediate-roll bending cylinder 751, and so on. - In addition, the entry side and the exit side in
FIG. 10 can be reversed, and the upper-intermediate-roll bending cylinders 750 and the upper-intermediate-roll bending cylinder 751C can be arranged on the entry side. In this case also, the number of the upper-intermediate-roll bending cylinders 751C is not particularly limited, and one or more upper-intermediate-roll bending cylinders 751C can be provided. - Furthermore, the upper-intermediate-
roll bending cylinders 751C can be added on the entry side and the exit side. - The rolling mill according to a fifth embodiment of the present invention is explained by using
FIG. 11 . - The rolling mill according to the present embodiment illustrated in
FIG. 11 corresponds to the rolling mill according to the first embodiment illustrated inFIG. 5 , but is different in that the upper-work-roll bending cylinders roll bending cylinders - With the rolling mill according to the fifth embodiment of the present invention also, advantages almost similar to those of the rolling mill according to the first embodiment mentioned before can be attained.
- Note that similarly to the present embodiment, it is possible to omit decrease-side bending cylinders in the third embodiment and the fourth embodiment also. In addition, it is also possible to add decrease-side bending cylinders in the second embodiment.
- Note that the present invention is not limited to the embodiments described above, and includes various modification examples. The embodiments described above are explained in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those including all the configurations explained. Whereas portions around intermediate rolls are explained, the same principles can be used effectively for portions around shifted work rolls.
- In addition, it is also possible to replace some of the configurations of an embodiment with configurations of another embodiment, and it is also possible to add a configuration of an embodiment to the configurations of another embodiment. In addition, also, some of the configurations of each embodiment can additionally have another configuration, can be deleted and can be replaced with other configurations.
-
- 1: Rolling facility
- 5: Rolled material
- 10: First stand (rolling mill)
- 20: Second stand (rolling mill)
- 30: Third stand (rolling mill)
- 40: Fourth stand (rolling mill)
- 50: Fifth stand (rolling mill)
- 60: Sixth stand (rolling mill)
- 70: Seventh stand (rolling mill)
- 80: Controller
- 700: Housing
- 702: Entry-side fixation member
- 703: Exit-side fixation member
- 710: Upper work roll (roll)
- 711: Lower work roll (roll)
- 712: Upper-work-roll bearing housing
- 713: Lower-work-roll bearing housing
- 714: Work-roll bending block part
- 715, 716, 725, 726: Shift cylinder
- 720: Upper intermediate roll (roll)
- 721: Lower intermediate roll (roll)
- 722, 722A: Upper-intermediate-roll bearing housing
- 723, 723A: Lower-intermediate-roll bearing housing
- 725A: Shift mechanism
- 727: Upper-intermediate-roll bending block part
- 728: Lower-intermediate-roll bending block part
- 730: Upper backup roll
- 731: Lower backup roll
- 732: Upper-backup roll bearing housing
- 733: Lower-backup roll bearing housing
- 740, 741: Upper-work-roll bending cylinder (first cylinder)
- 742, 743: Upper-work-roll bending cylinder (fifth cylinder)
- 744, 745: Lower-work-roll bending cylinder (first cylinder)
- 746, 747: Lower-work-roll bending cylinder (fifth cylinder)
- 750, 750A, 751, 751A: Upper-intermediate-roll bending cylinder (first cylinder)
- 750B: Upper-intermediate-roll bending cylinder (third cylinder)
- 751C: Upper-intermediate-roll bending cylinder (fourth cylinder)
- 752, 753: Lower-intermediate-roll bending cylinder (first cylinder)
- 760: Upper-work-roll bearing-housing backlash elimination cylinder (second cylinder)
- 762: Lower-work-roll bearing-housing backlash elimination cylinder (second cylinder)
- 771, 771A: Upper-intermediate-roll bearing-housing backlash elimination cylinder (second cylinder)
- 773: Lower-intermediate-roll bearing-housing backlash elimination cylinder (second cylinder)
- 780: Upper-backup roll bearing-housing backlash elimination cylinder
- 782: Lower-backup roll bearing-housing backlash elimination cylinder
- 790: Bearing
- 822AB: Upper-intermediate-roll bearing-housing flange part
Claims (10)
- A rolling mill comprising: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; andthree or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, whereinthe bearing and the first cylinders are provided on each a drive side and an work side of the roll,two first cylinders among the first cylinders are provided in the roll-axis direction on the exit side or entry side in a rolling direction,one first cylinder among the first cylinders is provided on a side that is one of the entry side and the exit side in the rolling direction, and that is opposite to a side provided with the two first cylinders, andthe first cylinder on the opposite side is positioned between the two first cylinders when viewed from the exit side or entry side in the rolling direction.
- The rolling mill according to claim 1, wherein
one or more of first cylinders in the two first cylinders are arranged outside an area within which a center of the bearing is shifted. - The rolling mill according to claim 1 or 2, further comprising:a fixation member that is fixed to a housing of the rolling mill at least on either the exit side or entry side in the rolling direction, and that is provided with the first cylinders; anda second cylinder that is disposed on either the entry side or the exit side of the fixation member, and applies pressing force to the bearing in a rolling direction or in a direction opposite to the rolling direction.
- The rolling mill according to any one of claims 1 to 3, further comprising:on either the entry side or the exit side, a second cylinder that applies pressing force to the bearing in a rolling direction or in a direction opposite to the rolling direction, whereinthe second cylinder, when the rolling mill is viewed from the exit side or entry side in the rolling direction, is arranged between the two first cylinders or is arranged on both of axial sides of the one first cylinder.
- The rolling mill according to any one of claims 1 to 4, further comprising:a controller that drives the first cylinders, whereinthe controller is configured to drive any one first cylinder of the two first cylinders and drive the first cylinder provided on the opposite side when bending of the roll is performed and when a center of the bearing is arranged on either an axially-outer side of an intersection of an axis line of the roll and a straight line linking the one first cylinder and a first cylinder, the first cylinder being one first cylinder of the two first cylinders and being provided on an axially-outer side, or an axially-inner side of an intersection of the axis line of the roll and a straight line linking the one first cylinder and a first cylinder, the first cylinder being one first cylinder of the two first cylinders and being provided on an axially-inner side.
- The rolling mill according to any one of claims 1 to 5, further comprising:a controller that drives the first cylinders, whereinthe controller is configured to perform control such that when bending of the roll is performed, a difference between total output force of the two first cylinders and output force of the first cylinder provided on the opposite side is within a predetermined range.
- The rolling mill according to any one of claims 1 to 6, further comprising:
between the two first cylinders, a third cylinder that further applies bending force vertically to the bearing to cause the roll to perform bending. - The rolling mill according to any one of claims 1 to 6, further comprising:at a position on an axially-outer side of the one first cylinder provided on the opposite side, one or more fourth cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, wherein,when the rolling mill is viewed from the exit side or entry side in the rolling direction, one first cylinder of the two first cylinders is arranged between the first cylinder and the fourth cylinder that are provided on the opposite side.
- The rolling mill according to any one of claims 1 to 8, comprising:a work roll that contacts a rolled material; andan intermediate roll that contacts the work roll, whereinthe roll is the intermediate roll.
- The rolling mill according to any one of claims 1 to 9, further comprising:a fixation member that is fixed to a housing of the rolling mill at least either entry-side or exit-side in the rolling direction, and is provided with the first cylinders; anda fifth cylinder that applies, to a bearing of a work roll that contacts a rolled material, bending force in a direction opposite to the bending force applied by the first cylinders to cause the work roll to perform bending.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2019/041943 WO2021079498A1 (en) | 2019-10-25 | 2019-10-25 | Rolling mill |
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EP3981522A1 true EP3981522A1 (en) | 2022-04-13 |
EP3981522A4 EP3981522A4 (en) | 2022-06-29 |
EP3981522B1 EP3981522B1 (en) | 2024-05-01 |
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EP19949862.7A Active EP3981522B1 (en) | 2019-10-25 | 2019-10-25 | Rolling mill |
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EP (1) | EP3981522B1 (en) |
JP (1) | JP7100416B2 (en) |
CN (1) | CN113950383B (en) |
WO (1) | WO2021079498A1 (en) |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3122128A1 (en) * | 1981-06-04 | 1982-12-23 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | Rolling stand |
BR8300010A (en) * | 1982-01-06 | 1983-08-30 | Hitachi Ltd | LAMINATOR |
JPS59229207A (en) | 1983-06-13 | 1984-12-22 | Hitachi Ltd | Rolling mill |
JPH0753285B2 (en) * | 1984-03-30 | 1995-06-07 | 株式会社日立製作所 | Rolling mill with work roll bearing box |
FR2611541B1 (en) * | 1987-02-27 | 1994-04-29 | Clecim Sa | DEVICE FOR ADJUSTING THE PROFILE AND DISTRIBUTION OF WEAR OF CYLINDERS IN A ROLLER WITH AXIALLY MOVABLE CYLINDERS |
JP2693972B2 (en) * | 1988-09-02 | 1997-12-24 | 株式会社日立製作所 | Roll shift device for rolling mill |
US5924319A (en) * | 1998-07-07 | 1999-07-20 | Danieli United | Roll crossing, offsetting, bending and shifting system for rolling mills |
FR2786415B1 (en) * | 1998-11-30 | 2001-02-09 | Kvaerner Metals Clecim | ROLLER EQUIPPED WITH WORKING CYLINDER BENDING MEANS |
EP1260283B1 (en) * | 2000-03-01 | 2005-10-12 | Hitachi, Ltd. | Rolling mill and hot finishing tandem rolling equipment |
CN100335189C (en) * | 2000-03-01 | 2007-09-05 | 株式会社日立制作所 | Rolling mill, and device for eliminating loose for roll bearing box |
JP3526554B2 (en) * | 2001-02-13 | 2004-05-17 | 株式会社日立製作所 | Tandem rolling equipment and rolling method |
CN200977529Y (en) * | 2006-09-28 | 2007-11-21 | 北京京诚之星科技开发有限公司 | Improved eight rolls roller |
EP2554282B1 (en) * | 2010-03-31 | 2015-03-25 | Nippon Steel & Sumitomo Metal Corporation | Metal plate rolling machine and rolling method |
-
2019
- 2019-10-25 WO PCT/JP2019/041943 patent/WO2021079498A1/en unknown
- 2019-10-25 JP JP2021553263A patent/JP7100416B2/en active Active
- 2019-10-25 EP EP19949862.7A patent/EP3981522B1/en active Active
- 2019-10-25 CN CN201980097298.3A patent/CN113950383B/en active Active
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JPWO2021079498A1 (en) | 2021-04-29 |
CN113950383B (en) | 2023-08-29 |
JP7100416B2 (en) | 2022-07-13 |
EP3981522B1 (en) | 2024-05-01 |
WO2021079498A1 (en) | 2021-04-29 |
EP3981522A4 (en) | 2022-06-29 |
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