CA2548796C - Rolling mill for rolling metal strip - Google Patents
Rolling mill for rolling metal strip Download PDFInfo
- Publication number
- CA2548796C CA2548796C CA2548796A CA2548796A CA2548796C CA 2548796 C CA2548796 C CA 2548796C CA 2548796 A CA2548796 A CA 2548796A CA 2548796 A CA2548796 A CA 2548796A CA 2548796 C CA2548796 C CA 2548796C
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- CA
- Canada
- Prior art keywords
- roll
- rolling
- strip
- rolling mill
- coiler
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
- B21B39/082—Bridle devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
-
- 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
- B21B37/48—Tension control; Compression control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/36—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
-
- 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
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
- B21B37/54—Tension control; Compression control by drive motor control including coiler drive control, e.g. reversing mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Floor Finish (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
Abstract
In a rolling mill for rolling metal strip (1), especially steel strip, which has at least one rolling stand (2), an upstream coiler (3), and a downstream coiler (4), wherein an "S"
roil unit (5, 6), which has two rolls (7, 8; 9, 10) that guide the strip (1) in the form of an "S", is arranged between the upstream coiler (3) and the rolling stand (2) and/or between the rolling stand (2) and the downstream coiler (4), the invention provides that a first roll (7, 9) of the "S" roll unit (5, 6) is arranged in a fixed manner, and a second roll (8, 10) of the "S"
roll unit (5, 6) is arranged in such a way that it can move relative to the first roll (7, 9).
roil unit (5, 6), which has two rolls (7, 8; 9, 10) that guide the strip (1) in the form of an "S", is arranged between the upstream coiler (3) and the rolling stand (2) and/or between the rolling stand (2) and the downstream coiler (4), the invention provides that a first roll (7, 9) of the "S" roll unit (5, 6) is arranged in a fixed manner, and a second roll (8, 10) of the "S"
roll unit (5, 6) is arranged in such a way that it can move relative to the first roll (7, 9).
Description
ROLLING MILL FOR ROLLING METAL STRIP
The invention concerns a rolling mill for rolling metal strip, especially steel strip, which has at least one rolling stand, an upstream coiler, and a downstream coiler, wherein an "S" roll unit, which has two rolls that guide the strip in the form of an "S", is arranged between the upstream coiler and the rolling stand and/or between the rolling stand and the downstream coiler; wherein a first roll of the "S" roll unit is arranged in a fixed manner, and a second roll of the "S" roll unit is arranged in such a way that it can move relative to the first roll; and wherein the second roll, which can move relative to the first roll, is rotatably mounted on a swivel arm, which is supported at one end in a stationary axis.
The increasing necessity for weight savings, especially in the automobile industry, has led to the development and use of load-adapted parts, so-called tailored blanks. The essential feature of these parts that is of special importance in this connection is that they have a variable thickness. Tailored blanks were originally produced mainly by welding. However, it was found that they can also be produced in an especially favorable way by flexible cold rolling, which can be used to produce tailored blanks.
In flexible cold rolling, the thickness of the rolling stock is varied during rolling. In this regard, the roll gap can be periodically varied. The thickness variation results in mass flow disturbances and tension fluctuations, especially on the entry side of the rolling stand but also on the delivery side of the rolling stand. At the rolling speeds necessary for profitable production, these mass flow disturbances and tension fluctuations can no longer be compensated by the dynamics of the coiler motors, so that so-called dancer rolls are used between the rolling stand and the coilers in installations of this type.
WO 03/008,122 Al describes a solution of this type. It discloses a cold rolling mill for cold rolling metal strip, which has a single stand with means for adjusting the roll gap, a coiler for uncoiling the strip upstream of the single cold rolling stand, and a coiler for coiling the strip downstream of the rolling stand. To achieve flexible rolling, a strip accumulator is arranged between the upstream coiler and the rolling stand for controlling the mass flow and the strip tension. This strip accumulator consists of at least three rolls. The middle roll is designed as a dancer roll and can be moved perpendicularly to the direction of conveyance of the strip.
Rolling mills of this general type are also described in DE
30 24 682 Al and JP 04-182,019 A. The swivel arm for adjusting one of the rolls of the "S" roll unit relative to the other is supported above the upper roll in this case. A motion control member is applied below the lower roll. Very large adjustment distances are thus necessary to effect the roll adjustment.
EP 1 121 990 A2 discloses a solution similar to that of WO
03/008,122 Al, but with the use of a larger number of rolls.
The same is true of a design disclosed by JP 10-034,204 Al.
The dancer rolls described in the cited documents are connected with a linear actuator, with which they can be moved perpendicularly to the direction of conveyance of the strip under open-loop or closed-loop control. The strip accumulator function that is essential for flexible cold rolling can be fulfilled in this way.
DE 198 18 207 C2 and JP 60-231,516 disclose so-called loopers, i.e., rolls which are applied to the strip fed to the rolling stand or carried away from the rolling stand, in order, for example, to be able to undertake a determination of the tensile force in the strip.
During rolling, the rolling force can be reduced by tensile forces on each side of the roll gap. However, it is only in the last pass that it must not be too high, since otherwise, as is known from experience, problems can arise in the subsequent process steps, especially during annealing. "S" roll units ("S"
rolls) can be used to develop a tension difference between the rolling stand and coiler.
When both a strip accumulator function is to be realized, generally with dancer rolls, and a desired tension difference between the rolling stand and the coiler is to be produced, generally by "S" roll units, considerable equipment expense is required in the prior-art solutions.
Therefore, the objective of the invention is to modify a metal strip rolling mill of the aforementioned type in such a way that simple and thus economical means can be employed both to realize a strip accumulator function, especially in the case of flexible rolling, and to maintain a tension difference between the rolling stand and coilers that can be controlled in a well-defined way.
In accordance with the invention, this objective is achieved by virtue of the fact that the stationary axis coincides with the axis of rotation of the first roll, wherein a linear actuator articulates with the swivel arm in a pivot some distance from the stationary axis, and wherein the pivot lies on a line connecting the axes of rotation of the two rolls.
Apart from guide rolls for the strip that may additionally be present, only the "S" roll unit is intended to be provided between the coiler and rolling stand, but both the strip accumulator function can be provided and the required tension on the strip can be exerted with the proposed design of the "S"
roll unit.
The two axes of the rolls of the "S" roll unit are arranged parallel to each other.
It is advantageous to use a hydraulic piston-cylinder system as the linear actuator.
To be able to influence the development of tension in the strip in an optimum way, means can be provided for driving at least one of the rolls of the "S" roll unit.
The proposal of the invention can be used to advantage in a cold rolling mill. In addition, the rolling stand is preferably a single stand. The proposed system is suitable especially for flexible rolling, which is why the rolling stand can have means for flexible adjustment of the roll gap.
Finally, strip conveyance or handling is improved by equipping at least one of the coilers with means that allow rotational speed control.
The proposed system makes it possible in a very simple and thus inexpensive way to provide a rolling plant for flexible rolling that makes available a strip accumulator, which is essential in this type of operation. In addition, the strip is also maintained at the required tension, so that the rolling itself can be carried out in an advantageous way from the standpoint of process engineering.
Accordingly, in one aspect, the present invention resides in a rolling mill for rolling a metal strip, which includes at least one rolling stand, an upstream coiler, and a downstream coiler, wherein an "S" roll unit, which has two rolls that guide the strip in the form of an "S", is arranged between the upstream coiler and the rolling stand and/or between the rolling stand and the downstream coiler; wherein a first roll of the "S" roll unit is arranged in a fixed manner, and a second roll of the "S" roll unit is arranged so as to be movable relative to the first roll; and wherein the second roll, which can move relative to the first roll, is rotatably mounted on a swivel arm, which is supported at one end in a stationary axis, the stationary axis coinciding with an axis of rotation of the first roll, wherein a linear actuator articulates with the swivel arm in a pivot a distance from the stationary axis, and wherein the pivot lies on a line connecting the axes of rotation of the first and second rolls.
BRIEF DESCRIPTION OF THE DRAWINGS
A specific embodiment of the invention is illustrated in the drawings.
-- Figure 1 shows a schematic side view of a rolling mill for the flexible rolling of metal strip.
-- Figure 2 shows an enlarged view of an "S" roll unit on the discharge side of the rolling mill.
Figure 1 shows a schematic view of a rolling mill, in which a coiled steel strip 1 is uncoiled from an upstream coiler 3 and fed to a single cold rolling stand 2. Another coiler 4, which re-coils the rolled metal strip 1, is installed downstream of the rolling stand 2 in the direction of conveyance R of the metal strip 1. The coilers 3, 4 are provided with drives (not shown), so that the strip 1 can be uncoiled and coiled' under open-loop or closed-loop control.
Flexible cold rolling of the strip is carried out in the rolling stand 2. The strip 1 has a nonconstant thickness -- as 6a viewed in its longitudinal direction. This means that, during the rolling process, the roll gap is varied in accordance with a preset profile to produce a strip whose thickness varies periodically.
To allow this process to be carried out under conditions that are favorable from the standpoint of process engineering, it is necessary to compensate the change in mass flow in the strip that results from the variable strip thickness.
Furthermore, a well-defined tension must be developed and maintained in the strip 1 to keep the rolling force low.
To accomplish this, an "S" roll unit 5, 6 is installed between the upstream coiler 3 and the rolling stand 2 and between the rolling stand 2 and the downstream coiler 4, respectively. Each "S" roll unit has two rolls 7, 8 and 9, 10, respectively, which are arranged relative to each other in a well-known way, so that the strip 1 is guided in an S-shaped path. The resulting wrapping of the rolls 7, 8, 9, 10 makes it possible, with suitable driving of the rolls, to transmit a force to the strip 1 and thus to maintain the desired tension in the strip 1 between the "S" roll unit 5, 6 and the rolling stand L .
To be able to achieve both the application of tension in the strip and the strip accumulator function, the "S" roll units and 6 are constructed as shown in Figure 2. Each unit has one roll 9 (or 7) that feeds the strip 1 to or guides it away from the rolling stand 2. This roll 9 (or 7) is supported in a fixed position. By contrast, the other roll 10 (or 8), is movably supported and can swivel relative to the first roll 9, 7. To this end, it is mounted at the end of a swivel arm 11. The other end of the swivel arm 11 is supported in a stationary axis 12, which coincides with the axis of rotation of the first roll 9, 7.
One end of a linear actuator 14, which is realized as a hydraulic piston-cylinder system, articulates with the swivel arm, namely, in a pivot 13 some distance from the axis of rotation of the second roll 8, 10. The actuator 14 is supplied with hydraulic oil as indicated in Figure 2.
When the piston-cylinder system 14 is acted upon by hydraulic oil under open-loop or closed-loop control, the pivot 13 can be raised or lowered, so that the second roll 8, 10 can he swiveled about its axis of rotation 12. This results in a longer or shorter distance for the strip 1 between the rolling stand 2 and coilers 3 or 4, thereby enabling the "S" roil units 5, 6 to carry out a strip accumulator function.
The above-described construction of the rolling mill and especially of the two "S" roll units 5, 6 makes it possible, with a very simple design, to compensate the mass flow variation that occurs during flexible cold rolling and at the same time to develop the tension difference between the rolling stand 2 and coilers 3, 4 that allows an optimum rolling operation. With suitably fast automatic control of the linear actuator 14, it is possible to compensate the mass flow disturbances without any appreciable tension fluctuations.
To achieve this goal in the past, it was necessary to use a large number of rolls, which made these installations expensive.
As a result of the compensation of the mass flow disturbances and the associated reduction of the tension fluctuations, the automatic control of strip thickness can be improved. It becomes possible to make adjustments of the tensile stresses favorable for the rolling process without regard to the tensile stresses present at the coilers.
The compensation of the mass flow disturbances and the strip accumulator function are now realized in one piece of equipment, namely, the "S" roll unit described above, for which separate pieces of equipment were previously needed.
List of Reference Symbols 1 metal strip (steel strip) 2 rolling stand 3 upstream coiler 4 downstream coiler "S" roll unit 6 "S" roll unit 7 roll 8 roll 9 roll roll 11 swivel arm 12 stationary axis 13 pivot 14 linear actuator R direction of conveyance of the strip
The invention concerns a rolling mill for rolling metal strip, especially steel strip, which has at least one rolling stand, an upstream coiler, and a downstream coiler, wherein an "S" roll unit, which has two rolls that guide the strip in the form of an "S", is arranged between the upstream coiler and the rolling stand and/or between the rolling stand and the downstream coiler; wherein a first roll of the "S" roll unit is arranged in a fixed manner, and a second roll of the "S" roll unit is arranged in such a way that it can move relative to the first roll; and wherein the second roll, which can move relative to the first roll, is rotatably mounted on a swivel arm, which is supported at one end in a stationary axis.
The increasing necessity for weight savings, especially in the automobile industry, has led to the development and use of load-adapted parts, so-called tailored blanks. The essential feature of these parts that is of special importance in this connection is that they have a variable thickness. Tailored blanks were originally produced mainly by welding. However, it was found that they can also be produced in an especially favorable way by flexible cold rolling, which can be used to produce tailored blanks.
In flexible cold rolling, the thickness of the rolling stock is varied during rolling. In this regard, the roll gap can be periodically varied. The thickness variation results in mass flow disturbances and tension fluctuations, especially on the entry side of the rolling stand but also on the delivery side of the rolling stand. At the rolling speeds necessary for profitable production, these mass flow disturbances and tension fluctuations can no longer be compensated by the dynamics of the coiler motors, so that so-called dancer rolls are used between the rolling stand and the coilers in installations of this type.
WO 03/008,122 Al describes a solution of this type. It discloses a cold rolling mill for cold rolling metal strip, which has a single stand with means for adjusting the roll gap, a coiler for uncoiling the strip upstream of the single cold rolling stand, and a coiler for coiling the strip downstream of the rolling stand. To achieve flexible rolling, a strip accumulator is arranged between the upstream coiler and the rolling stand for controlling the mass flow and the strip tension. This strip accumulator consists of at least three rolls. The middle roll is designed as a dancer roll and can be moved perpendicularly to the direction of conveyance of the strip.
Rolling mills of this general type are also described in DE
30 24 682 Al and JP 04-182,019 A. The swivel arm for adjusting one of the rolls of the "S" roll unit relative to the other is supported above the upper roll in this case. A motion control member is applied below the lower roll. Very large adjustment distances are thus necessary to effect the roll adjustment.
EP 1 121 990 A2 discloses a solution similar to that of WO
03/008,122 Al, but with the use of a larger number of rolls.
The same is true of a design disclosed by JP 10-034,204 Al.
The dancer rolls described in the cited documents are connected with a linear actuator, with which they can be moved perpendicularly to the direction of conveyance of the strip under open-loop or closed-loop control. The strip accumulator function that is essential for flexible cold rolling can be fulfilled in this way.
DE 198 18 207 C2 and JP 60-231,516 disclose so-called loopers, i.e., rolls which are applied to the strip fed to the rolling stand or carried away from the rolling stand, in order, for example, to be able to undertake a determination of the tensile force in the strip.
During rolling, the rolling force can be reduced by tensile forces on each side of the roll gap. However, it is only in the last pass that it must not be too high, since otherwise, as is known from experience, problems can arise in the subsequent process steps, especially during annealing. "S" roll units ("S"
rolls) can be used to develop a tension difference between the rolling stand and coiler.
When both a strip accumulator function is to be realized, generally with dancer rolls, and a desired tension difference between the rolling stand and the coiler is to be produced, generally by "S" roll units, considerable equipment expense is required in the prior-art solutions.
Therefore, the objective of the invention is to modify a metal strip rolling mill of the aforementioned type in such a way that simple and thus economical means can be employed both to realize a strip accumulator function, especially in the case of flexible rolling, and to maintain a tension difference between the rolling stand and coilers that can be controlled in a well-defined way.
In accordance with the invention, this objective is achieved by virtue of the fact that the stationary axis coincides with the axis of rotation of the first roll, wherein a linear actuator articulates with the swivel arm in a pivot some distance from the stationary axis, and wherein the pivot lies on a line connecting the axes of rotation of the two rolls.
Apart from guide rolls for the strip that may additionally be present, only the "S" roll unit is intended to be provided between the coiler and rolling stand, but both the strip accumulator function can be provided and the required tension on the strip can be exerted with the proposed design of the "S"
roll unit.
The two axes of the rolls of the "S" roll unit are arranged parallel to each other.
It is advantageous to use a hydraulic piston-cylinder system as the linear actuator.
To be able to influence the development of tension in the strip in an optimum way, means can be provided for driving at least one of the rolls of the "S" roll unit.
The proposal of the invention can be used to advantage in a cold rolling mill. In addition, the rolling stand is preferably a single stand. The proposed system is suitable especially for flexible rolling, which is why the rolling stand can have means for flexible adjustment of the roll gap.
Finally, strip conveyance or handling is improved by equipping at least one of the coilers with means that allow rotational speed control.
The proposed system makes it possible in a very simple and thus inexpensive way to provide a rolling plant for flexible rolling that makes available a strip accumulator, which is essential in this type of operation. In addition, the strip is also maintained at the required tension, so that the rolling itself can be carried out in an advantageous way from the standpoint of process engineering.
Accordingly, in one aspect, the present invention resides in a rolling mill for rolling a metal strip, which includes at least one rolling stand, an upstream coiler, and a downstream coiler, wherein an "S" roll unit, which has two rolls that guide the strip in the form of an "S", is arranged between the upstream coiler and the rolling stand and/or between the rolling stand and the downstream coiler; wherein a first roll of the "S" roll unit is arranged in a fixed manner, and a second roll of the "S" roll unit is arranged so as to be movable relative to the first roll; and wherein the second roll, which can move relative to the first roll, is rotatably mounted on a swivel arm, which is supported at one end in a stationary axis, the stationary axis coinciding with an axis of rotation of the first roll, wherein a linear actuator articulates with the swivel arm in a pivot a distance from the stationary axis, and wherein the pivot lies on a line connecting the axes of rotation of the first and second rolls.
BRIEF DESCRIPTION OF THE DRAWINGS
A specific embodiment of the invention is illustrated in the drawings.
-- Figure 1 shows a schematic side view of a rolling mill for the flexible rolling of metal strip.
-- Figure 2 shows an enlarged view of an "S" roll unit on the discharge side of the rolling mill.
Figure 1 shows a schematic view of a rolling mill, in which a coiled steel strip 1 is uncoiled from an upstream coiler 3 and fed to a single cold rolling stand 2. Another coiler 4, which re-coils the rolled metal strip 1, is installed downstream of the rolling stand 2 in the direction of conveyance R of the metal strip 1. The coilers 3, 4 are provided with drives (not shown), so that the strip 1 can be uncoiled and coiled' under open-loop or closed-loop control.
Flexible cold rolling of the strip is carried out in the rolling stand 2. The strip 1 has a nonconstant thickness -- as 6a viewed in its longitudinal direction. This means that, during the rolling process, the roll gap is varied in accordance with a preset profile to produce a strip whose thickness varies periodically.
To allow this process to be carried out under conditions that are favorable from the standpoint of process engineering, it is necessary to compensate the change in mass flow in the strip that results from the variable strip thickness.
Furthermore, a well-defined tension must be developed and maintained in the strip 1 to keep the rolling force low.
To accomplish this, an "S" roll unit 5, 6 is installed between the upstream coiler 3 and the rolling stand 2 and between the rolling stand 2 and the downstream coiler 4, respectively. Each "S" roll unit has two rolls 7, 8 and 9, 10, respectively, which are arranged relative to each other in a well-known way, so that the strip 1 is guided in an S-shaped path. The resulting wrapping of the rolls 7, 8, 9, 10 makes it possible, with suitable driving of the rolls, to transmit a force to the strip 1 and thus to maintain the desired tension in the strip 1 between the "S" roll unit 5, 6 and the rolling stand L .
To be able to achieve both the application of tension in the strip and the strip accumulator function, the "S" roll units and 6 are constructed as shown in Figure 2. Each unit has one roll 9 (or 7) that feeds the strip 1 to or guides it away from the rolling stand 2. This roll 9 (or 7) is supported in a fixed position. By contrast, the other roll 10 (or 8), is movably supported and can swivel relative to the first roll 9, 7. To this end, it is mounted at the end of a swivel arm 11. The other end of the swivel arm 11 is supported in a stationary axis 12, which coincides with the axis of rotation of the first roll 9, 7.
One end of a linear actuator 14, which is realized as a hydraulic piston-cylinder system, articulates with the swivel arm, namely, in a pivot 13 some distance from the axis of rotation of the second roll 8, 10. The actuator 14 is supplied with hydraulic oil as indicated in Figure 2.
When the piston-cylinder system 14 is acted upon by hydraulic oil under open-loop or closed-loop control, the pivot 13 can be raised or lowered, so that the second roll 8, 10 can he swiveled about its axis of rotation 12. This results in a longer or shorter distance for the strip 1 between the rolling stand 2 and coilers 3 or 4, thereby enabling the "S" roil units 5, 6 to carry out a strip accumulator function.
The above-described construction of the rolling mill and especially of the two "S" roll units 5, 6 makes it possible, with a very simple design, to compensate the mass flow variation that occurs during flexible cold rolling and at the same time to develop the tension difference between the rolling stand 2 and coilers 3, 4 that allows an optimum rolling operation. With suitably fast automatic control of the linear actuator 14, it is possible to compensate the mass flow disturbances without any appreciable tension fluctuations.
To achieve this goal in the past, it was necessary to use a large number of rolls, which made these installations expensive.
As a result of the compensation of the mass flow disturbances and the associated reduction of the tension fluctuations, the automatic control of strip thickness can be improved. It becomes possible to make adjustments of the tensile stresses favorable for the rolling process without regard to the tensile stresses present at the coilers.
The compensation of the mass flow disturbances and the strip accumulator function are now realized in one piece of equipment, namely, the "S" roll unit described above, for which separate pieces of equipment were previously needed.
List of Reference Symbols 1 metal strip (steel strip) 2 rolling stand 3 upstream coiler 4 downstream coiler "S" roll unit 6 "S" roll unit 7 roll 8 roll 9 roll roll 11 swivel arm 12 stationary axis 13 pivot 14 linear actuator R direction of conveyance of the strip
Claims (8)
1. Rolling mill for rolling a metal strip (1), which includes at least one rolling stand (2), an upstream coiler (3), and a downstream coiler (4), wherein an "S" roll unit (5, 6), which has two rolls (7, 8; 9, 10) that guide the strip (1) in the form of an "S", is arranged between the upstream coiler (3) and the rolling stand (2) and/or between the rolling stand (2) and the downstream coiler (4); wherein a first roll (7, 9) of the "S" roll unit (5, 6) is arranged in a fixed manner, and a second roll (8, 10) of the "S" roll unit (5, 6) is arranged so as to be movable relative to the first roll (7, 9); and wherein the second roll (8, 10), which can move relative to the first roll (7, 9), is rotatably mounted on a swivel arm (11), which is supported at one end in a stationary axis (12), the stationary axis (12) coinciding with an axis of rotation of the first roll (7, 9), wherein a linear actuator (14) articulates with the swivel arm (11) in a pivot (13) a distance from the stationary axis (12), and wherein the pivot (13) lies on a line connecting the axes of rotation of the first and second rolls (7, 9; 8, 10).
2. Rolling mill in accordance with Claim 1, characterized by the fact that the linear actuator (14) is a hydraulic piston-cylinder system.
3. Rolling mill in accordance with Claim 1 or Claim 2, characterized by means for driving at least one of the rolls (7, 8, 9, 10) of the "S" roll unit (5, 6).
4. Rolling mill in accordance with any one of Claims 1 to 3, wherein the rolling mill is designed as a cold rolling mill.
5. Rolling mill in accordance with any one of Claims 1 to 4, characterized by the fact that the rolling stand (2) is a single stand.
6. Rolling mill in accordance with any one of Claims 1 to 5, characterized by the fact that the rolling stand (2) is equipped with means for flexible adjustment of the roll gap.
7. Rolling mill in accordance with any one of Claims 1 to 6, characterized by the fact that at least one of the coilers (3, 4) is equipped with means for rotational speed control.
8. Rolling mill in accordance with any one of claims 1 to 7, wherein the metal strip comprises a steel strip.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004041321A DE102004041321A1 (en) | 2004-08-26 | 2004-08-26 | Rolling mill for rolling metallic strip |
DE102004041321.5 | 2004-08-26 | ||
PCT/EP2005/008686 WO2006021324A1 (en) | 2004-08-26 | 2005-08-10 | Rolling mill for rolling a metallic strip |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2548796A1 CA2548796A1 (en) | 2006-03-02 |
CA2548796C true CA2548796C (en) | 2012-03-20 |
Family
ID=35033388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2548796A Expired - Fee Related CA2548796C (en) | 2004-08-26 | 2005-08-10 | Rolling mill for rolling metal strip |
Country Status (14)
Country | Link |
---|---|
US (1) | US20070261456A1 (en) |
EP (1) | EP1784266B1 (en) |
JP (1) | JP4976291B2 (en) |
KR (1) | KR101139305B1 (en) |
CN (1) | CN101010154B (en) |
AT (1) | ATE410248T1 (en) |
BR (1) | BRPI0506421A (en) |
CA (1) | CA2548796C (en) |
DE (2) | DE102004041321A1 (en) |
ES (1) | ES2311233T3 (en) |
RU (1) | RU2409435C2 (en) |
TW (1) | TWI346586B (en) |
WO (1) | WO2006021324A1 (en) |
ZA (1) | ZA200601956B (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006047463A1 (en) * | 2006-10-07 | 2008-04-17 | ACHENBACH BUSCHHüTTEN GMBH | Rolling mill and method for flexible cold or hot one-way or reverse rolling of metal strip |
DE102008035738B4 (en) * | 2007-07-31 | 2020-06-18 | Danieli Germany GmbH | Rolling device |
DE102009018914A1 (en) * | 2009-04-28 | 2010-11-18 | Otto Junker Gmbh | Device for compensation of tension fluctuations and / or for adjusting the tension on a conveyed flexible strand of material |
DE102010063827A1 (en) | 2010-12-22 | 2012-06-28 | Sms Siemag Ag | Apparatus and method for rolling a metal strip |
CN102320000B (en) * | 2011-07-08 | 2013-01-30 | 邢台纳科诺尔极片轧制设备有限公司 | Rolling and slitting system for battery plate |
WO2013020814A1 (en) | 2011-08-08 | 2013-02-14 | Siemens Vai Metals Technologies Gmbh | Rolling system and rolling method |
CN102989769B (en) * | 2012-12-19 | 2015-04-22 | 肇庆宏旺金属实业有限公司 | Acid-washing and cold-rolling integrated device |
DE102012224351A1 (en) * | 2012-12-21 | 2014-06-26 | Sms Siemag Ag | Method and device for winding a metal strip |
ES2633030T3 (en) * | 2015-05-29 | 2017-09-18 | Giebel Kaltwalzwerk Gmbh | Procedure for laminating a metal band with steps |
DE102019215265A1 (en) * | 2018-12-06 | 2020-06-10 | Sms Group Gmbh | Method for operating a roll stand for step rolling |
Family Cites Families (11)
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FR1426347A (en) * | 1964-12-17 | 1966-01-28 | Spidem Ste Nle | Device for handling a strip product |
DE3024682A1 (en) * | 1980-06-30 | 1982-01-28 | Schloemann-Siemag AG, 4000 Düsseldorf | Finishing rolling mill - passes cold rolled strip in S-loop through traction roller pairs before and after mill |
US4463586A (en) * | 1983-04-13 | 1984-08-07 | Reycan Research Limited | Auto wrap angle/positioner for shape sensing roll |
JP2794934B2 (en) * | 1990-11-15 | 1998-09-10 | 石川島播磨重工業株式会社 | Rolling mill thickness control device |
JP2698038B2 (en) * | 1993-12-07 | 1998-01-19 | 株式会社日立製作所 | Strip rolling equipment and bridle rolls |
DE19524729A1 (en) * | 1995-07-07 | 1997-01-16 | Sundwiger Eisen Maschinen | Method and device for rolling strips with a non-uniform thickness and / or length distribution across their width |
US5878933A (en) * | 1995-10-18 | 1999-03-09 | Laughery; Harry E. | Strip guiding apparatus and associated method for maintaining lateral position |
US5660070A (en) * | 1996-03-18 | 1997-08-26 | Carolina Steel Corporation | Cold rolling mill with tension bridle |
DE19945202A1 (en) * | 1999-09-21 | 2001-03-22 | Bfi Vdeh Inst Angewandte Forschung Gmbh | Method and device for rolling or winding tape |
DE10133756A1 (en) * | 2001-07-11 | 2003-01-30 | Sms Demag Ag | Cold rolling mill and method for cold rolling metallic strip |
DE10315357B4 (en) * | 2003-04-03 | 2005-05-25 | Muhr Und Bender Kg | Process for rolling and rolling plant for rolling metal strip |
-
2004
- 2004-08-26 DE DE102004041321A patent/DE102004041321A1/en not_active Withdrawn
-
2005
- 2005-08-10 US US11/660,174 patent/US20070261456A1/en not_active Abandoned
- 2005-08-10 CA CA2548796A patent/CA2548796C/en not_active Expired - Fee Related
- 2005-08-10 KR KR1020067007277A patent/KR101139305B1/en active IP Right Grant
- 2005-08-10 RU RU2006135625/02A patent/RU2409435C2/en not_active IP Right Cessation
- 2005-08-10 JP JP2007528677A patent/JP4976291B2/en not_active Expired - Fee Related
- 2005-08-10 ES ES05777530T patent/ES2311233T3/en active Active
- 2005-08-10 BR BRPI0506421-0A patent/BRPI0506421A/en not_active IP Right Cessation
- 2005-08-10 CN CN2005800286991A patent/CN101010154B/en not_active Expired - Fee Related
- 2005-08-10 EP EP05777530A patent/EP1784266B1/en active Active
- 2005-08-10 DE DE502005005642T patent/DE502005005642D1/en active Active
- 2005-08-10 WO PCT/EP2005/008686 patent/WO2006021324A1/en active Application Filing
- 2005-08-10 AT AT05777530T patent/ATE410248T1/en active
- 2005-08-12 TW TW094127493A patent/TWI346586B/en not_active IP Right Cessation
-
2006
- 2006-03-08 ZA ZA200601956A patent/ZA200601956B/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN101010154B (en) | 2010-09-29 |
CN101010154A (en) | 2007-08-01 |
CA2548796A1 (en) | 2006-03-02 |
TW200609049A (en) | 2006-03-16 |
KR20070042490A (en) | 2007-04-23 |
JP4976291B2 (en) | 2012-07-18 |
BRPI0506421A (en) | 2006-12-26 |
EP1784266B1 (en) | 2008-10-08 |
TWI346586B (en) | 2011-08-11 |
DE102004041321A1 (en) | 2006-03-02 |
RU2409435C2 (en) | 2011-01-20 |
RU2006135625A (en) | 2008-04-20 |
DE502005005642D1 (en) | 2008-11-20 |
WO2006021324A1 (en) | 2006-03-02 |
KR101139305B1 (en) | 2012-04-26 |
ATE410248T1 (en) | 2008-10-15 |
ES2311233T3 (en) | 2009-02-01 |
EP1784266A1 (en) | 2007-05-16 |
JP2008510624A (en) | 2008-04-10 |
US20070261456A1 (en) | 2007-11-15 |
ZA200601956B (en) | 2008-03-26 |
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