CN112705572B - Rolling mill and rolling method - Google Patents
Rolling mill and rolling method Download PDFInfo
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- CN112705572B CN112705572B CN202011050543.6A CN202011050543A CN112705572B CN 112705572 B CN112705572 B CN 112705572B CN 202011050543 A CN202011050543 A CN 202011050543A CN 112705572 B CN112705572 B CN 112705572B
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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
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/07—Adaptation of roll neck bearings
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/02—Backlash elimination
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2269/00—Roll bending or shifting
- B21B2269/02—Roll bending; vertical bending of rolls
- B21B2269/04—Work roll bending
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- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a rolling mill and a rolling method capable of reducing eccentric load of a bearing even though the structure is simpler than the prior art. The 1 st cylinders are respectively arranged at the inlet side and the outlet side in the rolling direction in the axial direction, and the control device (80) is configured to be capable of selectively driving the 1 st cylinder in the inlet side and the 1 st cylinder in the outlet side so as to apply resultant force of the 1 st cylinder in the inlet side and the 1 st cylinder in the outlet side to the central part of the bearing (790) when the roll bends and when at least the center of the bearing (790) is arranged between the 1 st cylinder arranged at the outermost side in the axial direction and the 1 st cylinder arranged at the innermost side in the axial direction in the 1 st cylinder.
Description
Technical Field
The invention relates to a rolling mill and a rolling method.
Background
As an example of a rolling mill capable of preventing an extreme eccentric load from being generated in a bearing, increasing the durability life of the bearing, increasing the amount of roll movement, and further improving the shape correction capability of a rolled material, patent document 1 describes the following: in order to cause the resultant of the bending forces acting on the bearings of the rolling rolls to always act on the longitudinal center positions of the bearings, it is provided that the respective pressures of the plurality of bending cylinders arranged in the roll axial direction can be adjusted, that is, for example, the hydraulic pressure of the cylinder on the side close to the longitudinal center of the bearing is set to be large and the hydraulic pressure of the cylinder on the side not close to the longitudinal center of the bearing is set to be small, whereby the resultant of the bending forces acts on the longitudinal center of the bearing with respect to the bearing even when the acting positions of the bending forces are different.
Documents of the prior art
Patent literature
Patent document 1: japanese examined patent publication No. 63-055369
The following rolling mills are known: the shape control of a rolled material is performed by a linking action between the movement of the roll and a bending force.
In such a rolling mill, there are cases where: if the position between the bearing and the bending cylinder is changed by the position of the moving roll and an eccentric load acts on the bearing, the life of the bearing is shortened, and the eccentric load becomes remarkable particularly in a roll having a large movement amount.
As an example of a technique for suppressing an eccentric load acting on a bearing to increase the life of the bearing, there is a technique described in patent document 1. In patent document 1, each cylinder pressure is adjusted so that the resultant force of the bending forces acting on the bearing acts on the central portion of the bearing in the roll axial direction.
However, the rolling mill having the structure described in patent document 1 requires many bending cylinders according to the movement of the rolls, and also requires many mechanisms for adjusting the pressing force of each cylinder, and accordingly, the number of parts increases, and the control becomes complicated, so that there is room for improvement in terms of simplification of the structure and the control.
Disclosure of Invention
The invention provides a rolling mill and a rolling method capable of reducing eccentric load of a bearing even though the structure is simpler than the prior art.
The present invention includes a plurality of means for solving the above-mentioned problems, and is characterized by comprising, as an example: a roll moving in an axial direction; bearings provided on both the drive side and the operation side, moving in the axial direction of the roll together with the roll, and receiving a load from the roll; 4 or more first cylinders 1 provided on both the drive side and the operation side, for bending the roll by applying a bending force to the bearing in the vertical direction; and a control device that drives the 1 st cylinders, wherein the 1 st cylinders are provided in the axial direction in an inlet side and an outlet side in the rolling direction, respectively, and the control device is configured to be capable of selectively driving the 1 st cylinder in the inlet side and the 1 st cylinder in the outlet side so as to apply a resultant force of the 1 st 1 cylinder in the inlet side and the 1 st cylinder in the outlet side to a central portion of the bearing when the roll is curved and when at least the center of the bearing is disposed between the 1 st cylinder disposed at the outermost side in the axial direction and the 1 st cylinder disposed at the innermost side in the axial direction among the 1 st cylinders.
Effects of the invention
According to the present invention, even with a simpler structure than the conventional one, the eccentric load on the bearing can be reduced. Problems, structures, and effects other than those described above will become apparent from the following description of the embodiments.
Drawings
Fig. 1 is a diagram showing an outline of a rolling facility including a rolling mill according to embodiment 1 or embodiment 2 of the present invention.
Fig. 2 is a front view illustrating an outline of a rolling mill of example 1 or example 2.
Fig. 3 isbase:Sub>A view showingbase:Sub>A part ofbase:Sub>A cross section taken along linebase:Sub>A-base:Sub>A' of fig. 2.
Fig. 4 is a view showing a part of a cross section of fig. 2 taken along line B-B'.
Fig. 5 is a plan view for explaining details of the work roll portion in the rolling mill of example 1.
Fig. 6 is a plan view for explaining details of another form of the work roll portion in the rolling mill according to example 1.
Fig. 7 is a plan view for explaining details of another form of the work roll portion in the rolling mill of example 2.
Description of the reference numerals
1: the rolling equipment is a rolling device which is provided with a rolling groove,
5: the rolling material is rolled, and the rolling material,
10: the 1 st support (rolling mill),
20: a 2 nd stand (rolling mill),
30: a 3 rd support (rolling mill),
40: a 4 th stand (rolling mill),
50: a 5 th stand (rolling mill),
60: a 6 th stand (rolling mill),
70: a 7 th stand (rolling mill),
80: a control device for controlling the operation of the motor,
700: the outer shell is provided with a plurality of grooves,
702: the fixing component at the inlet side is provided with a fixing component,
703: a fixing component at the outlet side of the main body,
710: an upper working roll (a rolling roll),
711: a lower work roll (a roll),
712. 712A: the upper operation roll bearing box is arranged on the upper operation roll bearing box,
713. 713A: a lower operation roll bearing box is arranged on the lower part of the rolling mill,
714: the bending block part of the working roller is provided with a bending block part,
715. 716, 725, 726: the cylinder is moved in a manner that the cylinder is moved,
715A: the moving mechanism is used for moving the movable plate,
720: an upper intermediate roller (a roller),
721: a lower intermediate roll (a roll),
722. 722A: the upper middle roll bearing box is arranged on the upper middle roll bearing box,
723. 723A: a lower middle roll bearing box is arranged on the lower portion of the rolling mill,
727: the bending block part of the upper middle roller,
728: a lower middle roller is used for bending the block part,
730: the upper reinforcing roller is arranged on the upper reinforcing roller,
731: the lower reinforcing roller is arranged on the lower side of the roller,
732: the upper part is provided with a reinforced roller bearing box,
733: the lower part of the reinforcing roller bearing box,
740. 740A, 741A: an upper working roller bending cylinder (the 1 st cylinder),
742. 743: a bending cylinder of the upper operation roller is arranged,
744. 745: a lower working roll bending cylinder (the 1 st cylinder),
746. 747: the bending cylinder of the lower operation roller is provided with a bending cylinder,
750. 751: an upper middle roll bending cylinder (the 1 st cylinder),
752. 753: a lower middle roll bending cylinder (the 1 st cylinder),
760: a looseness eliminating cylinder (No. 2 cylinder) of an upper operation roll bearing box,
762: a lower operation roller bearing box looseness eliminating cylinder (the 2 nd cylinder),
771: a looseness eliminating cylinder (No. 2 cylinder) of an upper middle roller bearing box,
773: a lower middle roll bearing box looseness eliminating cylinder (the 2 nd cylinder),
780: the upper reinforced roller bearing box looseness eliminating cylinder,
782: a lower reinforcing roller bearing box looseness eliminating cylinder,
790: a bearing is arranged on the bearing seat, and the bearing seat,
812AB: and (4) upper operation roll bearing box flange parts.
Detailed Description
Embodiment 1 or embodiment 2 of the rolling mill and the rolling method according to the present invention will be described with reference to fig. 1 to 7. Fig. 1 isbase:Sub>A schematic diagram showingbase:Sub>A rolling mill includingbase:Sub>A rolling mill according to embodiment 1 or embodiment 2, fig. 2 isbase:Sub>A front view illustrating the schematic diagram of the rolling mill, fig. 3 isbase:Sub>A view illustratingbase:Sub>A part ofbase:Sub>A cross section taken alongbase:Sub>A-base:Sub>A 'in fig. 2, fig. 4 isbase:Sub>A view illustratingbase:Sub>A part ofbase:Sub>A cross section taken along B-B' in fig. 2, and fig. 5, 6, and 7 are plan views illustrating details ofbase:Sub>A work roll portion.
< example 1 >
First, an outline of a rolling facility including the rolling mill of the present embodiment will be described with reference to fig. 1.
As shown in fig. 1, the rolling mill 1 includes a plurality of rolling mills that hot-roll a rolled material 5 into a strip, and includes 7 stands, i.e., a 1 st stand (stand) 10, a 2 nd stand 20, a 3 rd stand 30, a 4 th stand 40, a 5 th stand 50, a 6 th stand 60, and a 7 th stand 70, and a control device 80 from the entry side of the rolled material 5. The 1 st stand 10, the 2 nd stand 20, the 3 rd stand 30, the 4 th stand 40, the 5 th stand 50, the 6 th stand 60, the 7 th stand 70, and the control device 80 among them correspond to what is called a rolling mill in the present invention.
The rolling mill 1 is not limited to the 7 stands shown in fig. 1, and can be a rolling mill including at least two stands or more.
Next, a part of the outline of the rolling mill of the present invention will be described with reference to fig. 2. In fig. 2, the 7 th stand 70 shown in fig. 1 is described as an example, but the rolling mill of the present invention can be applied to any one of the 1 st stand 10, the 2 nd stand 20, the 3 rd stand 30, the 4 th stand 40, the 5 th stand 50, and the 6 th stand 60 shown in fig. 1.
In fig. 2, the 7 th stand 70 as a rolling mill of the present embodiment is a 6-stage rolling mill that rolls a rolling material 5, and includes a housing 700, a control device 80, and a hydraulic device (not shown).
The housing 700 includes an upper work roll 710, a lower work roll 711, and an upper intermediate roll 720 and a lower intermediate roll 721 that support the upper work roll 710 and the lower work roll 711 by being in contact with the upper work roll 710 and the lower work roll 711, respectively. Further, the upper and lower reinforcing rolling rolls 730 and 731 are provided to support the upper and lower intermediate rolling rolls 720 and 721 by being in contact with the upper and lower intermediate rolling rolls 720 and 721, respectively.
At the axial end of the upper work roll 710 of these rolls, bearings 790 (see fig. 5) that move in the axial direction of the rolls together with the upper work roll 710 and receive the load from the rolls are provided on both the drive side and the operating side, and these bearings are supported by upper work roll bearing boxes 712, 712A. Similarly, the lower work roll 711 is provided with bearings (omitted here for convenience of illustration) at both the drive side and the operating side at the end portions in the axial direction, and these bearings are supported by the lower work roll bearing boxes 713 and 713A.
In the present embodiment, the upper work roll 710 is configured to be movable in the roll axial direction by a moving mechanism 715A by driving a moving cylinder 715 of the type shown in fig. 3 via an upper work roll bearing box 712 on the operating side. Similarly, the lower work roll 711 is configured to be movable in the roll axial direction by the lower work roll bearing housing 713 on the operation side by the moving cylinder 716 as shown in fig. 3.
The upper intermediate roll 720 is provided with bearings (not shown) on both the drive side and the operation side at its axial end portions, and these bearings are supported by upper intermediate roll bearing boxes 722A, 722, respectively. The lower intermediate roll 721 is also provided with bearings (not shown) at both the drive side and the operation side at the end portions in the axial direction, and these bearings are supported by the lower intermediate roll bearing boxes 723A, 723, respectively.
The upper intermediate roll 720 is configured to be movable in the roll axial direction by a drive-side upper intermediate roll bearing housing 722A by a moving cylinder 725 of the type shown in fig. 3. Similarly, the lower intermediate roll 721 can also be moved in the roll axial direction by the lower intermediate roll bearing housing 723A on the drive side by the moving cylinder 726 of the type shown in fig. 3.
Returning to fig. 2, an inlet-side fixing member 702 is fixed to the inlet-side housing 700 of the rolled material 5, and an outlet-side fixing member 703 is fixed to the outlet-side housing 700 opposite to the inlet-side fixing member 702 on the outlet side of the rolled material 5.
In the 7 th stand 70, as shown in fig. 2 and 4, on both the operation side and the driving side, the upper work roll bending cylinders 740 provided in the work roll bending block portions 714 of the entry-side fixing member 702, the upper work roll bending cylinders 742 provided in the upper intermediate roll bending block portions 727, and the upper work roll bending cylinders 741 and 743 provided in the exit-side fixing member 703 support the upper work roll bearing boxes 712 and 712A, and by appropriately driving these cylinders, it is possible to impart a bending force to the bearings of the upper work roll 710 in the vertical direction to bend the upper work roll 710.
Similarly, as shown in fig. 2 and 4, on both the operation side and the driving side, the lower work roll bearing boxes 713 and 713A are supported by the lower work roll bending cylinder 744 provided to the entry-side fixing member 702, the lower work roll bending cylinder 746 provided to the lower intermediate roll bending block unit 728, and the lower work roll bending cylinders 745 and 747 provided to the exit-side fixing member 703, and by appropriately driving these cylinders, bending force can be applied to the bearings of the lower work roll 711 in the vertical direction to bend the lower work roll 711.
The upper intermediate roll 720 is supported on both the operating side and the driving side by an upper intermediate roll bending cylinder 750 provided in the upper intermediate roll bending block portion 727 of the entry-side fixing member 702 and an upper intermediate roll bending cylinder 751 provided in the upper intermediate roll bending block portion 727 of the exit-side fixing member 703, and by appropriately driving these cylinders, bending force is applied to the bearings in the vertical direction, and the upper intermediate roll 720 can be bent. Further, upper work roll bending cylinders 742, 743 are provided on the entry side and the exit side of the upper intermediate roll bending block 727, and the upper work roll 710 can be bent by appropriately driving these cylinders.
The lower intermediate roll 721 also supports the lower intermediate roll bearing boxes 723 and 723A on the operating side and the driving side by the lower intermediate roll bending cylinder 752 provided in the lower intermediate roll bending block unit 728 of the entry-side fixing member 702 and the lower intermediate roll bending cylinder 753 provided in the lower intermediate roll bending block unit 728 of the exit-side fixing member 703, and by appropriately driving these cylinders, bending force is applied to the bearings in the vertical direction to bend the lower intermediate roll 721. Further, lower work roll bending cylinders 746 and 747 are provided on the entry side and exit side of the lower intermediate roll bending block unit 728, and the lower work roll 711 can be bent by appropriately driving these cylinders.
Of these cylinders, the upper work roll bending cylinders 740 and 741 are disposed to apply a bending force to the bearing of the upper work roll 710 that is in contact with the rolled material 5 on the vertically increasing side (opposite to the rolled material side) to bend the roll (the 1 st cylinder). The upper work roll bending cylinders 742 and 743 are arranged to apply a bending force on the vertical direction reduction side (the rolling material side direction) opposite to the upper work roll bending cylinders 740 and 741 to the bearings to bend the upper work roll 710.
Similarly, the lower work roll bending cylinders 744 and 745 are arranged to apply a bending force to the bearings of the lower work roll 711 which is in contact with the rolled material 5 in the vertically increasing side to bend the rolls (the 1 st cylinder). The lower work roll bending cylinders 746 and 747 are arranged to apply a bending force on the bearings on the side of reduction opposite to the lower work roll bending cylinders 744 and 745 to bend the lower work roll 711.
The upper intermediate roll bending cylinders 750 and 751 are disposed to apply bending force to the bearing of the upper intermediate roll 720 on the vertically increasing side to bend the roll (the 1 st cylinder).
The lower intermediate roll bending cylinders 752 and 753 are arranged to apply a bending force to the bearing of the lower intermediate roll 721 on the side of increasing in the vertical direction to bend the rolls (the 1 st cylinder).
As shown in fig. 2, 3, and 4, for the purpose of eliminating the backlash, an upper work roll bearing housing backlash elimination cylinder 760 (2 nd cylinder) is provided to the inlet side fixing member 702 on the inlet side of the rolled material 5 so as to apply a horizontal force, specifically, a pressing force in the rolling direction to the upper work roll 710 via a spacer (not shown) of the upper work roll bearing housing 712, 712A. Similarly, a lower work roll bearing housing looseness eliminating cylinder 762 (2 nd cylinder) is provided in the entry side fixing member 702 so as to apply a pressing force to the lower work roll 711 in the rolling direction via the packing of the lower work roll bearing housings 713, 713A. This makes it possible to apply a desired force to the work roll or the like in a direction orthogonal to the roll axial direction.
As shown in fig. 2 and 3 and fig. 4, for the purpose of eliminating the backlash, an upper intermediate roll bearing housing backlash eliminating cylinder 771 (2 nd cylinder) is provided in the outlet side fixing member 703 on the outlet side of the rolled material 5 so as to apply a horizontal force to the upper intermediate roll 720, that is, a pressing force to the side opposite to the rolling direction, via the spacers of the upper intermediate roll bearing housings 722A and 722A. Similarly, a lower intermediate roll bearing housing looseness eliminating cylinder 773 (2 nd cylinder) is provided in the exit side fixing member 703 so as to apply a pressing force to the lower intermediate roll 721 in the opposite direction to the rolling direction via the spacers of the lower intermediate roll bearing housings 723A, 723A.
Returning to fig. 2, bearings (not shown) are provided at both the drive side and the operation side at the axial end of the upper reinforcing roll 730, and these bearings are supported by an upper reinforcing roll bearing housing 732. Similarly, the lower reinforcing roll 731 is provided with bearings (not shown) on both the driving side and the operating side at the axial end portions, and these bearings are supported by the lower reinforcing roll bearing box 733.
As shown in fig. 2, an upper reinforcing roll bearing housing looseness eliminating cylinder 780 is provided in the housing 700 on the entry side so as to apply a horizontal force to the upper reinforcing roll 730 via an upper reinforcing roll bearing housing 732. Similarly, a lower reinforcing roll bearing box looseness eliminating cylinder 782 is provided in the housing 700 on the entry side so as to apply a horizontal force to the lower reinforcing roll 731 via the lower reinforcing roll bearing box 733.
The hydraulic device is connected to each hydraulic cylinder such as each bending cylinder, the loosening prevention cylinder, the shift cylinder, or a pressing cylinder (not shown) for applying a pressing force (rolling force) for rolling the rolled material 5 to the upper work roll 710 and the lower work roll 711, and is connected to the control device 80.
The control device 80 controls the operation of the hydraulic device to supply and discharge hydraulic oil (pressure oil, pressurized oil) to and from the respective bending cylinders and the like, thereby controlling the respective cylinders in a driving manner.
Next, a description will be given of a structure associated with the upper work roll 710 among the rolls, with reference to fig. 5. The upper intermediate roll 720, the lower work roll 711, and the lower intermediate roll 721 may have the same configuration as the upper work roll 710. The detailed configuration is substantially the same as that of the upper work roll 710, and therefore, the description thereof is omitted.
The present invention is suitably applied to the upper work roll 710 or the lower work roll 711 shown in fig. 5.
In the embodiment shown in fig. 5, two upper work roll bending cylinders 740 are provided in the axial direction of the rolls on the entry side of the rolled material 5 on each of the drive side and the operating side of the upper work rolls 710. Two upper work roll bending cylinders 741 are provided on the exit side of the rolled material 5, and two 1 st cylinders are provided in an axial direction on the entry side and the exit side in the rolling direction. These two upper work roll bending cylinders 740 provided on the entry side of the rolled material 5 and two upper work roll bending cylinders 741 provided on the exit side of the rolled material 5 are arranged so as to overlap when viewed from the rolling direction.
In the present embodiment, the upper work roll bearing housing looseness eliminating cylinder 760 disposed on the entry side of the rolled material 5 is disposed at an intermediate position in the axial direction where two upper work roll bending cylinders 740 are disposed on the same entry side as seen from the rolling direction.
Further, it is desirable to configure and/or control the output in the following manner: the length of the bearing 790 in the axial direction is set to L B In time, the action positions of the outputs of the two upper work roll bending cylinders 740, 741 driven and the output of the 1 upper work roll bearing housing looseness eliminating cylinder 760Are respectively limited to L axially outward from the axial center of the bearing 790 B L within 4 and axially inward from the axial center of the bearing 790 B L within a range of/4, i.e., limited to the axial center of the bearing 790 B In the range of/2.
Next, the drive control of the upper work roll bending cylinders 740 and 741 and the upper work roll bearing housing looseness eliminating cylinder 760 according to the present embodiment will be described in detail with reference to fig. 5 and table 1. Their drive control is performed by a control device 80 that drive-controls the hydraulic device.
Here, L represents the amount of movement of the upper work roll 710, i.e., the amount of movement of the axial center of the bearing 790 S (the amount of movement on the drive direction side is positive).
[ TABLE 1 ]
When the work roll moves between Ls, the bearing centers are present in the sections a, B, and C shown in fig. 5. When the bearing center is located in the section C, the upper work roll bending cylinder 740 ON the drive side and the upper work roll bending cylinder 741 ON the exit side both deactivate (OFF) the cylinder ON the axial inner side and activate (ON) the cylinder ON the axial outer side. The outputs of the driven cylinders on the entry side and the exit side in total act in the vicinity of the intersection of the line connecting the driven cylinders and the roll axis. The position on which the total output of the cylinders acts is limited to L from the axial center of the bearing 790 to the axial outer side B L within 4 and axially inward from the axial center of the bearing 790 B L within a range of/4, i.e., limited to the axial center of the bearing 790 B In the range of/2.
Therefore, L axially outside the intersection point of the straight line connecting the axially outer entry-side upper work roll bending cylinder 740 and the axially inner exit-side upper work roll bending cylinder 741 (or the straight line connecting the axially inner entry-side upper work roll bending cylinder 740 and the axially outer exit-side upper work roll bending cylinder 741) and the roll axis is positioned closer to the outside than the intersection point of the two cylinders B Within/4The position is located at the boundary between the section a and the section B. L axially inward of the intersection B The boundary between the section B and the section C exists at a position within/4.
On the operating side, both the entry-side upper work roll bending cylinder 740 and the exit-side upper work roll bending cylinder 741 have the axially outer cylinder not driven and have the axially inner cylinder driven.
When the bearing center is located in the section a, on the driving side, the upper work roll bending cylinder 740 on the entry side and the upper work roll bending cylinder 741 on the exit side both drive the cylinder on the axially outer side and drive the cylinder on the axially inner side.
On the operating side, both the entry-side upper work roll bending cylinder 740 and the exit-side upper work roll bending cylinder 741 have the axially inner cylinder not driven and the axially outer cylinder driven.
When the bearing center is located in the section B, that is, when the center of the bearing 790 is disposed between the 1 st cylinder disposed on the axially outer side among the 1 st cylinders and the 1 st cylinder disposed on the axially inner side, and when the acting positions of the resultant forces of the bearing center and the 1 st cylinder disposed so as to overlap on the entry side and the exit side are separated as viewed from the rolling direction, the 1 st cylinder of the entry side and the 1 st cylinder of the exit side are driven so that the resultant forces are applied to the center portion of the bearing 790.
In this case, the controller 80 drives the 1 st cylinder adjacent to the 1 st cylinder disposed to overlap when viewed from the rolling direction. More specifically, the first cylinder 1 disposed on the inner side in the axial direction of the two first cylinders 1 disposed on one of the inlet side and the outlet side is driven, and the first cylinder 1 disposed on the outer side in the axial direction of the two first cylinders 1 disposed on the other of the inlet side and the outlet side is driven.
The detailed driving mode is divided into the following two modes.
The 1 st mode is as follows: on the driving side, the axially outer cylinder of the entry-side upper work roll bending cylinder 740 is not driven, and the axially inner cylinder is driven, and the axially inner cylinder of the exit-side upper work roll bending cylinder 741 is not driven, and the axially outer cylinder is driven.
The operation side is also such that the axially outer cylinder of the entry-side upper work roll bending cylinder 740 is not driven and the axially inner cylinder is driven, and the axially inner cylinder of the exit-side upper work roll bending cylinder 741 is not driven and the axially outer cylinder is driven (the side of the section B in table 1 without parentheses).
In the 2 nd mode, on the driving side, the axially inner cylinder of the entry-side upper work roll bending cylinder 740 is not driven and the axially outer cylinder is driven, and the axially outer cylinder of the exit-side upper work roll bending cylinder 741 is not driven and the axially inner cylinder is driven.
The operation side is also such that the axially inner cylinder of the entry-side upper work roll bending cylinder 740 is not driven, the axially outer cylinder is driven, and the axially outer cylinder of the exit-side upper work roll bending cylinder 741 is not driven, and the axially inner cylinder is driven (bracket side of section B in table 1).
The upper work roll bearing housing looseness eliminating cylinder 760 is driven in any of the sections a, B, and C in table 1.
In the above example, the case where the outputs of the upper work roll bending cylinders 740 and 741 and the output of the upper work roll bearing housing looseness elimination cylinder 760 are only ON and OFF has been described, but the bending force can be applied to the axial center of the bearing 790 more accurately by adjusting the outputs of the upper work roll bending cylinders 740 and 741 and the output of the upper work roll bearing housing looseness elimination cylinder 760 more finely and independently.
In fig. 5, a case where two upper work roll bending cylinders 740 are provided on the entry side of the rolled material 5 in the axial direction of the rolls and two upper work roll bending cylinders 741 are provided on the exit side of the rolled material 5 has been described, but the number of cylinders provided is not particularly limited as long as the number of cylinders is two or more on the entry side and the exit side.
Hereinafter, a case where 3 upper work roll bending cylinders are provided on the entry side and the exit side will be described with reference to fig. 6 and table 2.
[ TABLE 2 ]
In the embodiment shown in fig. 6, 3 upper work roll bending cylinders 740A are provided in the axial direction of the rolls on the entry side of the rolled material 5. Further, 3 upper work roll bending cylinders 741A are provided on the exit side of the rolled material 5, and 31 st cylinders are provided in an axial direction on the entry side and the exit side in the rolling direction, respectively. These 3 upper work roll bending cylinders 740A provided on the entry side of the rolled material 5 and 3 upper work roll bending cylinders 741A provided on the exit side of the rolled material 5 are arranged so that all cylinders overlap when viewed from the rolling direction. Upper work roll bearing housing looseness eliminating cylinders 760 are added to both the operation side and the drive side between the upper work roll bending cylinders 740 on the entry side in fig. 5 and between the upper work roll bending cylinders 740A on the entry side in fig. 6.
Next, the drive control of the upper work roll bending cylinders 740A and 741A and the upper work roll bearing housing looseness eliminating cylinder 760 according to the present embodiment will be described in detail with reference to fig. 6 and table 2. Their drive control is performed by a control device 80 that drive-controls the hydraulic devices.
When the work roll moves between Ls, the bearing centers are present in the sections a, B, and C shown in fig. 6. When the bearing center is located in the section C, on the driving side, only the cylinder on the outer side in the axial direction is driven for the entry-side upper work roll bending cylinder 740A, and only the cylinder on the middle in the axial direction is driven for the exit-side upper work roll bending cylinder 741A. On the operating side, only the cylinder on the axial inner side is driven by the entry-side upper work roll bending cylinder 740A, and only the cylinder on the axial center is driven by the exit-side upper work roll bending cylinder 741A (the side without parenthesis in section C in table 2).
Alternatively, on the driving side, only the axially central cylinder is driven for the entry-side upper work roll bending cylinder 740A, and only the axially outer cylinder is driven for the exit-side upper work roll bending cylinder 741A. On the operating side, only the cylinder in the middle in the axial direction is driven by the upper work roll bending cylinder 740A on the entry side, and only the cylinder on the inner side in the axial direction is driven by the upper work roll bending cylinder 741A on the exit side (bracket side of section C in table 2).
Next, when the bearing center is located in the section B, on both the driving side and the operating side, only the cylinder centered in the axial direction is driven for both the entry-side upper work roll bending cylinder 740A and the exit-side upper work roll bending cylinder 741A.
Next, when the bearing center is located in the section a, on the driving side, only the cylinder on the axially inner side is driven for the entry-side upper work roll bending cylinder 740A, and only the cylinder on the axially middle side is driven for the exit-side upper work roll bending cylinder 741A. Also on the operating side, only the cylinder on the outer side in the axial direction is driven by the upper work roll bending cylinder 740A on the entry side, and only the cylinder on the middle side in the axial direction is driven by the upper work roll bending cylinder 741A on the exit side (the side of section a in table 2 without bracket).
Alternatively, on the driving side, only the cylinder centered in the axial direction is driven for the entry-side upper work roll bending cylinder 740A, and only the cylinder on the axial direction inner side is driven for the exit-side upper work roll bending cylinder 741A. On the operating side, only the cylinder on the center in the axial direction is driven by the upper work roll bending cylinder 740A on the entry side, and only the cylinder on the outer side in the axial direction is driven by the upper work roll bending cylinder 741A on the exit side (bracket side of section a in table 2).
As described above, in the embodiment of fig. 6, when the position of action of the resultant force of the 1 st cylinder arranged so as to overlap the entry side and the exit side when viewed from the rolling direction is separated from the bearing center position when the 1 st cylinder arranged at the axially outermost side of the 1 st cylinders and the 1 st cylinder arranged at the axially innermost side of the 1 st cylinders at the center of the bearing 790 are arranged, the driving is performed so that the lines intersecting the driven cylinders on the entry side and the exit side do not parallel to each other on the driving side and the operating side but intersect at the position on the entry side or the exit side of the rolled material 5, in consideration of the lines connecting the driven cylinders on the entry side and the exit side, except when the driving side and the axial center of the bearing 790 move between the upper work roll bending cylinders 740A and 741A that are axially centered.
The upper work roll bearing housing looseness eliminating cylinder 760 is driven in all of the sections a, B, and C in table 2. The drive and pressure of two cylinders arranged in the axial direction are adjusted so that the operating positions of the cylinders are not greatly separated from the center positions of the bearings in the sections A, B, and C.
In the example of fig. 6, the case where the outputs of the upper work roll bending cylinders 740A and 741A and the output of the upper work roll bearing housing looseness eliminating cylinder 760 are only ON and OFF has been described, but the bending force can be applied more accurately to the axial center of the bearing 790 by adjusting the outputs of the upper work roll bending cylinders 740A and 741A and the output of the upper work roll bearing housing looseness eliminating cylinder 760 more finely and independently.
Next, the effects of the present embodiment will be described.
The rolling mill of the present embodiment described above includes: a roll moving in an axial direction; bearings 790, provided on both the drive side and the operating side, moving in the axial direction of the roll together with the roll, receiving the load from the roll; 4 or more 1 st cylinders provided on both the drive side and the operation side and bending the roll by applying a bending force to the bearing 790 in the vertical direction; and a control device 80 that drives the 1 st cylinder. Among them, the 1 st cylinder is provided with more than two in the axial direction on the entry side and the exit side in the rolling direction, respectively, and the control device 80 is configured to be able to select to drive the 1 st cylinder in the entry side and the 1 st cylinder in the exit side so as to apply the resultant force of the 1 st cylinder in the entry side and the 1 st cylinder in the exit side to the central portion of the bearing 790, when the roll is curved and at least the center of the bearing 790 is arranged between the 1 st cylinder arranged on the outermost side in the axial direction and the 1 st cylinder arranged on the innermost side in the axial direction among the 1 st cylinders in the 1 st cylinder in the axial direction.
Therefore, when the bearing center is disposed between the 1 st cylinders, it is not necessary to drive all the 1 st cylinders provided with 4 or more to 1 bearing, and the bending resultant force can be applied to the vicinity of the longitudinal direction central portion of the bearing by the two 1 st cylinders, and therefore, it is not necessary to provide many mechanisms for adjusting the pressing force of each cylinder in order to reduce the eccentric load to the bearing, and the control is simple, and therefore, a structure simpler than that of a conventional rolling mill can be provided.
Further, since the 1 st cylinder on the entry side and the 1 st cylinder on the exit side are arranged so as to overlap each other when viewed from the rolling direction, the resultant bending force generated by the two 1 st cylinders can be more easily applied to the vicinity of the longitudinal center portion of the bearing.
Further, the present invention includes: an inlet fixing member 702 and an outlet fixing member 703 fixed to at least one of an inlet and an outlet in a rolling direction of a housing of a rolling mill and provided with a 1 st cylinder; and a 2 nd cylinder which applies a pressing force to the bearing 790 in the rolling direction or in the opposite direction to the rolling direction on one of the entry side and the exit side of the entry side fixing member 702 and the exit side fixing member 703, thereby preventing the bearing and the 1 st cylinder from being displaced in the rolling direction when the tip end of the rolled material 5 bites in. This can provide an effect of preventing the bending action position from being displaced. That is, since the movement of the bearing in the rolling direction in a state where the bending force is applied can be suppressed, the sliding does not occur in the portion pressed by the 1 st cylinder, and the damage of the 1 st cylinder and the wear of the pressed side can be suppressed, and the bending accuracy can be maintained high.
Further, the controller 80 is configured to drive the 1 st cylinder adjacent to the 1 st cylinder arranged to overlap when viewed from the rolling direction, and when 4 first cylinders are provided, for example, the 1 st cylinder provided on the inner side in the axial direction of the two 1 st cylinders on one of the entry side and the exit side is driven, and the 1 st cylinder provided on the outer side in the axial direction of the two 1 st cylinders on the other of the entry side and the exit side is driven, whereby the resultant bending force can be applied to the vicinity of the longitudinal center portion of the bearing by using the two 1 st cylinders more accurately and easily, and therefore, the eccentric load on the bearing can be reduced by a simple configuration without providing many mechanisms for adjusting the pressing force of each cylinder.
< example 2 >
A rolling mill in example 2 of the present invention will be described with reference to fig. 7 and table 3.
[ TABLE 3 ]
The difference between fig. 7 and fig. 5 is explained. In the present embodiment, the shift amount Ls is divided into sections a and B. Table 3 shows the relationship between the bearing center position and the driving state of each cylinder. The position of the intersection of the line connecting e1 and d2 and the roll axis is defined as the boundary between section B and section a. When the bearing center exists in either of the sections a and B, the two upper work roll bending cylinders 741 on the exit side are driven together.
When the axial center of the bearing 790 is located in the section B, the drive shaft drives the upper work roll bending cylinder 740 (e 1 position), the upper work roll bending cylinder 741 (d 1 position), and the upper work roll bending cylinder 741 (d 2 position) to the inner side, where the output of the upper work roll bending cylinder 741 (d 1 position) is set to the output obtained by multiplying the required output-side bending force Pbd by the predetermined coefficient α d1, and the output of the upper work roll bending cylinder 741 (d 2 position) is set to the output obtained by multiplying the required output-side bending force Pbd by the predetermined coefficient α d 2.
When the axial center of the bearing 790 is located in the section a, the drive shaft has the upper work roll bending cylinder 740 (e 2 position), the upper work roll bending cylinder 741 (d 1 position), and the upper work roll bending cylinder 741 (d 2 position) on the outer side, where the output of the upper work roll bending cylinder 741 (d 1 position) is an output obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient α d1, and the output of the upper work roll bending cylinder 741 (d 2 position) is an output obtained by multiplying the required exit-side bending force Pbd by a predetermined coefficient α d 2.
That is, all of the 1 st cylinders on the outlet side are driven, and only the 1 st cylinder on the inlet side is driven. Alternatively, all of the 1 st cylinders on the inlet side may be driven, and only the 1 st cylinder on the outlet side may be driven. In fig. 7, the 2 nd cylinder is provided on the inlet side, but may be provided on the outlet side.
The upper work roll bearing housing looseness eliminating cylinder 760 is driven in both of the sections a and B.
Therefore, when the bearing center is disposed between the 1 st cylinders, it is not necessary to drive all the 1 st cylinders provided with 4 for 1 bearing, and the bending resultant force can be applied to the vicinity of the longitudinal direction central portion of the bearing by the 31 st cylinders, so that it is not necessary to provide many mechanisms for adjusting the pressing force of each cylinder in order to reduce the eccentric load on the bearing, and the control is simple, and therefore, a structure simpler than that of a conventional rolling mill can be provided. Further, since the resultant bending force of the 1 st cylinder can be adjusted steplessly, it is easy to match the position of action of the resultant bending force with the bearing center regardless of where the bearing center exists in the section.
< other >
The present invention is not limited to the above-described embodiments, and various modifications and applications can be made. The above-described embodiments have been described in detail to explain the present invention in a clear and easy manner, but are not limited to embodiments having all the configurations described above.
Claims (7)
1. A rolling mill is characterized by comprising:
a roll moving in an axial direction;
bearings provided on both the drive side and the operation side, moving in the axial direction of the roll together with the roll, and receiving a load from the roll;
4 or more first cylinders 1 provided on both the drive side and the operation side, for bending the roll by applying a bending force to the bearing in the vertical direction; and
a control device which drives the 1 st cylinder,
more than two cylinders are respectively arranged in the axial direction at the inlet side and the outlet side of the 1 st cylinder in the rolling direction,
the control device is configured to be able to selectively drive 1 st cylinder in the entry side and 1 st cylinder in the exit side, which are part of the 1 st cylinders among the 4 or more 1 st cylinders, so as to apply a resultant force of the 1 st cylinder in the entry side and the 1 st cylinder in the exit side to a central portion of the bearing, when the roll is curved and when at least the center of the bearing is disposed between the 1 st cylinder disposed at the outermost side in the axial direction and the 1 st cylinder disposed at the innermost side in the axial direction among the 1 st cylinders.
2. The rolling mill of claim 1,
the control device is configured to be able to select one of the remaining 1 st cylinder on the inlet side and the remaining 1 st cylinder on the outlet side to be driven.
3. The rolling mill of claim 1 or 2,
the rolling mill further comprises:
a fixing member fixed to at least one of an entry side and an exit side in a rolling direction of a housing of the rolling mill, the fixing member being provided with the 1 st cylinder; and
and a 2 nd cylinder that applies a pressing force to the bearing in a rolling direction or on a side opposite to the rolling direction on one of the entry side and the exit side of the fixed member.
4. The rolling mill of claim 1 or 2,
the control device can select to drive the 1 st cylinder adjacent to the 1 st cylinder disposed to overlap when viewed from the rolling direction.
5. The rolling mill according to claim 1 or 2,
in the case of 4 cylinders, the number of the 1 st cylinder is 4,
the drive device is configured to drive the 1 st cylinder disposed on the inner side in the axial direction of the two 1 st cylinders on one of the inlet side and the outlet side, and drive the 1 st cylinder disposed on the outer side in the axial direction of the two 1 st cylinders on the other of the inlet side and the outlet side.
6. A rolling method for a rolling mill, the rolling mill comprising:
a roll moving in an axial direction;
bearings provided on both the drive side and the operation side, moving in the axial direction of the roll together with the roll, and receiving a load from the roll;
4 or more first cylinders 1 provided on both the drive side and the operation side, for bending the roll by applying a bending force to the bearing in the vertical direction; and
a control device which drives the 1 st cylinder,
the rolling method is characterized in that the rolling method comprises the following steps,
the 1 st cylinder is respectively arranged at the inlet side and the outlet side of the rolling direction in the axial direction in two,
when at least the center of the bearing is disposed between the two 1 st cylinders provided in the axial direction and when the roll is curved, it is possible to select driving of the 1 st cylinder provided on the inner side in the axial direction of the two 1 st cylinders provided on one of the inlet side and the outlet side and the 1 st cylinder provided on the outer side in the axial direction of the two 1 st cylinders provided on the other of the inlet side and the outlet side, which are part of the 41 st cylinders.
7. The rolling method according to claim 6,
the rolling mill is also provided with:
a fixing member fixed to at least one of an entry side and an exit side of a housing of the rolling mill in a rolling direction, the fixing member being provided with the 1 st cylinder; and
and a 2 nd cylinder that applies a pressing force to the bearing in a rolling direction or on a side opposite to the rolling direction on one of the entry side and the exit side in the fixed mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019194120A JP6979437B2 (en) | 2019-10-25 | 2019-10-25 | Rolling machine and rolling method |
| JP2019-194120 | 2019-10-25 |
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| CN112705572A CN112705572A (en) | 2021-04-27 |
| CN112705572B true CN112705572B (en) | 2022-12-23 |
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| CN202011050543.6A Active CN112705572B (en) | 2019-10-25 | 2020-09-29 | Rolling mill and rolling method |
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| EP (1) | EP3812057B1 (en) |
| JP (1) | JP6979437B2 (en) |
| CN (1) | CN112705572B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0132136A2 (en) * | 1983-07-13 | 1985-01-23 | Kabushiki Kaisha Kobe Seiko Sho | Method & apparatus for edge rolling plate like stock material |
| US4773246A (en) * | 1986-02-14 | 1988-09-27 | Clecim | Process for adjusting the profile of rolls movable in a rolling mill and improved rolling mill for carrying out the process |
| CN1422708A (en) * | 2001-12-07 | 2003-06-11 | 株式会社日立制作所 | Shape-controlling method and device for continuous-rolling mill |
| CN1636644A (en) * | 2000-03-01 | 2005-07-13 | 株式会社日立制作所 | Rolling mill, and device for eliminating loose for roll bearing box |
| CN101091963A (en) * | 2007-07-26 | 2007-12-26 | 大连华锐股份有限公司 | Strip mill of using combined type hydraulic cylinder of bending roller |
| CN102335677A (en) * | 2010-07-23 | 2012-02-01 | 宝山钢铁股份有限公司 | Quick replacement device and replacement method for stand roller of heavy plate mill |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59229207A (en) * | 1983-06-13 | 1984-12-22 | Hitachi Ltd | Rolling mill |
| JPS62275508A (en) * | 1986-05-21 | 1987-11-30 | Hitachi Ltd | Six-high rolling mill |
| FR2786415B1 (en) * | 1998-11-30 | 2001-02-09 | Kvaerner Metals Clecim | ROLLER EQUIPPED WITH WORKING CYLINDER BENDING MEANS |
| WO2001064360A1 (en) * | 2000-03-01 | 2001-09-07 | Hitachi, Ltd. | Rolling mill, looseness eliminating device of roll bearing housing, rolling method, method of modifying rolling mill, and hot finishing tandem rolling equipment |
| JP3526554B2 (en) * | 2001-02-13 | 2004-05-17 | 株式会社日立製作所 | Tandem rolling equipment and rolling method |
-
2019
- 2019-10-25 JP JP2019194120A patent/JP6979437B2/en active Active
-
2020
- 2020-09-29 CN CN202011050543.6A patent/CN112705572B/en active Active
- 2020-10-19 EP EP20202668.8A patent/EP3812057B1/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0132136A2 (en) * | 1983-07-13 | 1985-01-23 | Kabushiki Kaisha Kobe Seiko Sho | Method & apparatus for edge rolling plate like stock material |
| US4773246A (en) * | 1986-02-14 | 1988-09-27 | Clecim | Process for adjusting the profile of rolls movable in a rolling mill and improved rolling mill for carrying out the process |
| CN1636644A (en) * | 2000-03-01 | 2005-07-13 | 株式会社日立制作所 | Rolling mill, and device for eliminating loose for roll bearing box |
| CN1422708A (en) * | 2001-12-07 | 2003-06-11 | 株式会社日立制作所 | Shape-controlling method and device for continuous-rolling mill |
| CN101091963A (en) * | 2007-07-26 | 2007-12-26 | 大连华锐股份有限公司 | Strip mill of using combined type hydraulic cylinder of bending roller |
| CN102335677A (en) * | 2010-07-23 | 2012-02-01 | 宝山钢铁股份有限公司 | Quick replacement device and replacement method for stand roller of heavy plate mill |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112705572A (en) | 2021-04-27 |
| EP3812057A1 (en) | 2021-04-28 |
| JP2021065919A (en) | 2021-04-30 |
| JP6979437B2 (en) | 2021-12-15 |
| EP3812057B1 (en) | 2023-01-04 |
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