CA2548777C - Combined operating modes and frame types in tandem cold rolling mills - Google Patents
Combined operating modes and frame types in tandem cold rolling mills Download PDFInfo
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- CA2548777C CA2548777C CA2548777A CA2548777A CA2548777C CA 2548777 C CA2548777 C CA 2548777C CA 2548777 A CA2548777 A CA 2548777A CA 2548777 A CA2548777 A CA 2548777A CA 2548777 C CA2548777 C CA 2548777C
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
- B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B1/24—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 continuous or semi-continuous process
- B21B1/28—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 continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B13/023—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally the axis of the rolls being other than perpendicular to the direction of movement of the product, e.g. cross-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B2013/025—Quarto, four-high stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B2013/028—Sixto, six-high stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Macromonomer-Based Addition Polymer (AREA)
- Prostheses (AREA)
- Toys (AREA)
Abstract
The invention relates to a method for combining the operating modes of individual rolling frames in a tandem cold rolling mill comprising respective pairs of working rolls (10) and back-up rolls (12) in 4-roll frames and in addition a pair of intermediate rolls (11) in 6-roll frames, at least the working rolls (10) and the intermediate rolls (11) interacting with devices for axial displacement. Said method is characterised by a combination of the following technologies: use of CVC/CVCplus technology with CVC roll contours of a higher order, where each working/intermediate roll (10, 11) comprises a roll surface that is extended by the amount of the travel displacement; use of Pair Cross (PC) technology, whereby each working/intermediate roll (10, 11) can be pivoted parallel to the strip plane; use of strip-edge oriented displacement of the working/intermediate rolls (10, 11), each of the latter (10, 11) having a roll surface that is extended by the amount of the travel displacement, with a cylindrical or spherical section and said rolls being displaced symmetrically against one another relative to the neutral displacement position (sZW = 0 and sAW = 0) in the centre of the frame (Y-Y) by an identical amount in the direction of their rotational axes (X-X). The method is also characterised in that the CVC/CVCplus technology, the strip-edge oriented displacement technology and optionally the PC technology can be achieved using a suitable plant concept with a single geometrically identical set of rolls.
Description
Combined Operating Modes and Frame Types in Tandem Cold Rolling Mills Background of the Invention The invention concerns a method for the combined operation of individual rolling stands in a tandem cold rolling mill, comprising a pair of work rolls and a pair of backup rolls in the case of four-high rolling stands and, in addition, a pair of intermediate rolls in the case of six-high rolling stands, wherein at least the work rolls and the intermediate rolls interact with axial shifting devices.
In the past, quality requirements for cold-rolled strip with respect to thickness tolerances, attainable final thicknesses, strip crown, strip flatness, surfaces, etc., have steadily increased. In addition, the great variety of products on the market for cold-rolled sheets and plates is leading to an increasingly varied product spectrum with respect to material properties and geometric dimensions. Due to this development, there has been an increasing need for more flexible plant designs and modes of operation in cold tandem trains -- optimally adapted to the final product to be rolled.
The conventional plant design of a tandem cold rolling mill resides in the arrangement of several four-high rolling stands in succession. The number of stands required is substantially determined by the total reduction required and by the final thickness to be produced. In addition to the basic designs with bending systems and fixed roll crowns as adjusting mechanisms that affect the roll gap, there are basically two other stand designs that additionally affect the roll gap either by shifting or swiveling the work rolls, which are based on different effective principles:
= technology of strip edge-oriented shifting = CVC/CVCP1us technology, and = PC technology (pair cross, i.e, slanting of the work rolls).
The work roll diameter has a considerable influence on the achievement of a desired final thickness and the realization of certain draft distributions (pass program design), especially in the case of relatively high-strength grades. As the diameter of the work roll decreases, the flattening behavior becomes more favorable and the required rolling force is reduced. Factors relating both to the transmission of torque and to the deflection of the roll, however, impose a limit on the extent to which the diameter can be reduced. If the roll neck cross sections are inadequate for transmitting the driving torques, the work rolls can be driven by the adjacent roll due to frictional engagement. Of course, in the case of a four-high rolling stand, heavy driving elements (motor, pinion gear unit, spindles) are necessary to realize a backup roll drive, and these elements make the mill more expensive. Here it makes sense to realize individual stands (usually the leading stands) as six-roll stands with an intermediate roll drive.
The flatness of the strip is significantly affected not only by vertical deflection but also by horizontal deflection of the work rolls and the intermediate rolls.
The horizontal shifting of the work rolls and the intermediate rolls from the center plane of the stand provides the set of rolls with support of a type which significantly decreases the horizontal deflection.
The rolling process can be additionally influenced with respect to flatness and the roll gap by slanting the work rolls. As is described in JP 57 190 704 for four-high rolling stands, the work rolls and the intermediate rolls are simultaneously pivoted relative to each other by the same amount parallel to the plane of the strip around a common pivot point at the center of the roll axis.
In addition, the six-high rolling stand has an additional, rapid adjusting mechanism for intermediate roll bending. In combination with work roll bending, the six-high rolling stand thus has two independent adjusting mechanisms that affect the roll gap. In the first stand, rapid adaptation of the roll gap to the profile of the entering strip for the purpose of avoiding flatness defects is guaranteed. In the last stand, both adjusting mechanisms can be effectively used for flatness control.
Another criterion for the quality of the final product is the surface condition of the exiting strip. The surface of the strip can be systematically predetermined by textured (roughened) and chromium-plated rolls. To prevent marks on the final product caused by the shifting of the wear edges or to prevent rippling on the strip surface caused by the occurrence of relative speed differences across the width of the exiting strip, it is helpful to provide a six-high rolling stand as the last stand of a tandem cold rolling mill. The work rolls are cylindrical or are furnished with a slight camber and are not shifted in the rolling process.
The effective principles described above involve separate stand conceptual designs, since different roll geometries are necessary. In conventional CVC technology, as described in EP 0 049 798 B1, the barrel lengths of the shiftable rolls are always longer than the stationary unshifted rolls by the amount of the axial shifting stroke.
As a result, the barrel edge of the shiftable roll cannot be pushed under the stationary roll barrel. Surface damage and marks are avoided in this way. The work rolls are generally supported over their entire length on the intermediate rolls or backup rolls. In this way, the rolling force applied by the backup rolls is transmitted to the entire length of the work rolls. As a result, the ends of the work rolls, which extend laterally beyond the rolling stock and thus are not involved in the rolling process, are deflected towards the rolling stock by the rolling force applied to them. This detrimental deflection of the work rolls causes upward bending of the middle sections of the roll. This in turn results in insufficient rolling out of the central region of the strip and excessive rolling out of the edges of the strip. These effects come into play especially when rolling conditions vary during operation of the rolling mill and when strips of different widths are being rolled.
By contrast, in the technology of strip edge-oriented shifting, as disclosed in DE 22 06 912 C3, rolls with the same barrel length are used in the entire set of rolls. The shiftable rolls are thus provided with a corresponding geometry at one end in the barrel edge region and with a setback to reduce locally arising load peaks. The effective principle is based on the strip edge-oriented readjustment of the barrel edge, ahead of, at, or even after the strip edge. Especially in the case of six-high rolling stands, the shifting of the intermediate roll below the backup roll allows the effectiveness of the positive work roll bending to be influenced in a systematic way. However, the axial shifting of the rolls in this method has an unfavorable effect on the load distribution in the contact joints. With decreasing strip width, there is a serious increase in the maximum load peak of the contact force distribution.
In DE 36 24 241 C2 (Method for Operating a Rolling Mill for the Production of Rolled Strip), the two methods discussed previously are combined. The objective is to make the unfavorable deflection of the work rolls under rolling force more uniform over the entire spectrum of strip widths arid to increase the effectiveness of the roll bending systems while shortening the shift distances without having to interrupt the continuous rolling operation. This objective is achieved by the strip edge-oriented shifting of intermediate rolls or work rolls with an applied CVC
cross section. The barrel edges of the CVC rolls are positioned in the region of the strip edge. As in the case of the technology of the strip edge-oriented shifting, the set of rolls comprises rolls of equal barrel lengths.
For reasons of economy, an effort is made to make all of the stands uniform, if possible, in order to reduce the expense of maintenance and replacement parts. In the past, therefore, tandem cold rolling mills were designed with the conventional plant layout or with the described technologies throughout.
Summary of the Invention The object of the invention is to realize these technologies/operating modes by a stand conceptual design with a geometrically identical set of rolls that is not limited only to a six-high rolling stand and not only to the intermediate rolls.
The objective with respect to the method is achieved by the combined use of the following technologies within the multiple-stand tandem cold rolling mill:
= use of CVC/CVCPlus technology with CVC roll contours of higher order, wherein each work roll/intermediate roll has a barrel lengthened by the amount of the shifting stroke;
= use of pair-cross (PC) technology, wherein each work roll/intermediate roll can be swiveled parallel to the plane of the strip; and = use of strip edge-oriented shifting of the work rolls/intermediate rolls, wherein each work roll/intermediate roll has a barrel which is lengthened by the amount of the shifting stroke and which has a cylindrical or cambered cross section, and the work rolls/intermediate rolls are each shifted from the neutral shift position by the same amount symmetrically to the center of the stand in the direction of their axes of rotation.
The roll configuration from CVC/CVCPlus technology for a six- high roll stand or a four-high roll stand is used as the basis for the stand conceptual design. The shiftable intermediate roll or work roll has a barrel that is longer by the CVC shifting stroke and is positioned symmetrically in the center of the stand for the neutral shift position.
The work roll/intermediate roll with a longer and symmetrical barrel is used during the strip edge-oriented shifting either with a cylindrical or cambered cross section. By suitable design of a setback in the region of the barrel edge in combination with the superimposed roll cross section and the strip width-dependent optimization of the axial shift position, the deformation behavior of the set of rolls and the effectiveness of the positive work roll bending (six-high rolling stand) can be systematically influenced, and the optimum roll gap can be adjusted.
In addition, barrel regions within the set of rolls are systematically shielded from the distribution of forces by optimization of the shift position of the work rolls/intermediate rolls. Deformations with negative effects that result from this are reduced, since the "principle of the ideal stand" is approached. However, the load distributions that occur in the respective contact joints increase due to the reduced contact lengths.
The stand conceptual designs described above are modified in accordance with the invention in such a way that the roll gap is controlled either by the shifting or the swiveling of the work roll/intermediate roll. A six-high rolling stand is absolutely necessary whenever an additional adjusting mechanism for controlling the edge drop of the strip is to be implemented in the stand. Two mutually independent shifting systems for the profile and flatness are needed for this purpose. The plant layout is substantially determined by these criteria. Depending on the requirements established for the rolling process, the range of plant configurations extends from conventional tandem cold rolling mills consisting of four-high rolling stands, to combined plants consisting of four/six-high rolling stands, to tandem cold rolling mills that consist exclusively of six-high rolling stands. The basic approach for realizing a strip edge-oriented shifting strategy exclusively of the intermediate rolls and exclusively in a six-high rolling stand with the use of a geometrically identical set of rolls is described in detail in DE 100 37 004 Al.
Further advantages, details, and features of the invention are apparent from the following explanations of the various specific embodiments that are schematically illustrated in the drawings. For the sake of clarity, the same rolls are provided with the same reference numbers.
Brief Description of the Drawings -- Figure 1 shows the geometry of the intermediate roll without roll cross-sectional shaping in a six-high rolling stand.
-- Figure 2 shows the geometry of the work roll without roll cross-sectional shaping in a four-high rolling stand.
-- Figure 3 shows the one-sided setback in the area of the barrel edge of a work roll/intermediate roll.
-- Figure 4 shows a stand conceptual design with a lengthened intermediate roll barrel.
-- Figure 5 shows a stand conceptual design with a lengthened work roll barrel.
-- Figures 6a-6c show positioning of the intermediate roll setback.
-- Figures 7a-7c show positioning of the work roll setback.
Detailed Description of the Invention Figures 1 and 2 show the geometry of the intermediate roll 11/work roll 10 without roll cross sectional shaping.
In Figure 1, the shiftable intermediate roll 11, which has a lengthened barrel, is positioned symmetrically with respect to the center Y-Y of the stand between the work roll 10 and the backup roll 12 in the neutral shift position szW = 0. In Figure 2, the work roll 10 has a lengthened barrel and is likewise positioned symmetrically with respect to the center Y-Y of the stand in the neutral shift position SAW = 0.
Figure 3 shows a schematic representation of the appearance and the geometric configuration of a one-sided setback d in the region of the barrel edge of a work roll/intermediate roll 10, 11. A one-sided setback, as used here, is already described in detail and illustrated by a drawing in DE 100 37 004 Al.
The length 1 of the one-sided setback d in the region of a barrel edge of the work roll/intermediate roll 10, 11 is divided into two adjacent regions a and b. In the first, inner region a, beginning at point do, the setback y(x) obeys the equation of the circle (1 - X)2 + y2 = R2, where R
is the radius of the roll. A value d(x) of the setback d of:
Region a:
= (R2 - (R - d) 2) 1/2 d = d (x) = R - (R2 - (1 -X) 2) 1/2 is then obtained for the region a.
If a minimally necessary diameter reduction 2d, which is predetermined as a function of external boundary conditions (rolling force and the resulting roll deformation), is reached, the setback d will run linearly as far as the barrel edge, so that the following is obtained for the region b:
Region b:
= 1 - a d = d(x) = constant.
The transition between region a and region b can be made with or without a continuously differentiable transition. In addition, this transition of the setback can also be made with a sequential setback of the dimension d resulting from the flattening according to a predetermined table. The setback d is then flatter, for example, in the transition region, than a radius and is very much steeper at the end. For reasons related to grinding technology, the transition to the cylindrical part is made with a correspondingly greater step in the transition between a and b (about 2d).
The diameter reduction 2d by the setback is made in such a way that the work roll 10 in a six-high rolling stand can bend freely by the setback d of the intermediate roll 11 without any worry about contact in the region b. In a four-high rolling stand, the setback d serves only for local reduction of the load peaks that arise.
The one-sided setback is normally located on the service side BS for the upper work roll/intermediate roll 10, 11 and on the drive side AS for the lower work roll/intermediate roll 10, 11, as illustrated in Figures 4 and 5. However, the effective principle remains the same if the setback d is placed in the opposite way on the drive side AS for the upper work roll/intermediate roll 10, 11 and on the service side BS for the lower work roll/intermediate roll 10, 11.
Figures 6a to 6c show the axial shifting of the intermediate roll 11 by a shifting stroke m. In Figure 6a, the beginning do of the setback do is positioned outside the strip edge (m = +), in Figure 6b, it is positioned at the strip edge (m = 0), and in Figure 6c, it is positioned inside the strip edge (m = -), i.e., already within the width of the strip. The positioning depends on the strip width and the material properties, so that the elastic behavior of the set of rolls and the effectiveness of the positive work roll bending (six-high rolling stand) can be systematically adjusted.
Finally, Figures 7a to 7c show the strip edge-oriented shifts of the work roll 10, which are carried out in the same way as for the intermediate roll 11 in Figures 6a to 6c.
In different strip width ranges, the shift position is predetermined by piecewise-linear step functions, on which the different positions of the beginning do of the setback d relative to the strip edge are based.
The essential advantage of the stand concept that has been described is that the CVC/CVCP1US technology and the technology of the strip edge-oriented shifting can be realized with only one geometrically identical set of rolls. Different roll types are no longer necessary. The only differences that still exist are in the roll cross section that is provided or in a setback according to predetermined values found as described above. In addition, there is the possibility of combining the two technologies with swiveling of the work rolls/intermediate rolls in the plane of the strip.
List of Reference Symbols work roll 11 intermediate roll 12 backup roll 14 rolled strip a first, inner segment length of d b second, outer segment length of d d setback d1) beginning of d d(x) value of d as a function of x 1 length of d in shifting stroke slaw amount of shift of a work roll szw amount of shift of an intermediate roll x, y Cartesian coordinates AS drive side BS service side R roll radius R., initial roll radius X-X axis of rotation Y-Y center of the stand
In the past, quality requirements for cold-rolled strip with respect to thickness tolerances, attainable final thicknesses, strip crown, strip flatness, surfaces, etc., have steadily increased. In addition, the great variety of products on the market for cold-rolled sheets and plates is leading to an increasingly varied product spectrum with respect to material properties and geometric dimensions. Due to this development, there has been an increasing need for more flexible plant designs and modes of operation in cold tandem trains -- optimally adapted to the final product to be rolled.
The conventional plant design of a tandem cold rolling mill resides in the arrangement of several four-high rolling stands in succession. The number of stands required is substantially determined by the total reduction required and by the final thickness to be produced. In addition to the basic designs with bending systems and fixed roll crowns as adjusting mechanisms that affect the roll gap, there are basically two other stand designs that additionally affect the roll gap either by shifting or swiveling the work rolls, which are based on different effective principles:
= technology of strip edge-oriented shifting = CVC/CVCP1us technology, and = PC technology (pair cross, i.e, slanting of the work rolls).
The work roll diameter has a considerable influence on the achievement of a desired final thickness and the realization of certain draft distributions (pass program design), especially in the case of relatively high-strength grades. As the diameter of the work roll decreases, the flattening behavior becomes more favorable and the required rolling force is reduced. Factors relating both to the transmission of torque and to the deflection of the roll, however, impose a limit on the extent to which the diameter can be reduced. If the roll neck cross sections are inadequate for transmitting the driving torques, the work rolls can be driven by the adjacent roll due to frictional engagement. Of course, in the case of a four-high rolling stand, heavy driving elements (motor, pinion gear unit, spindles) are necessary to realize a backup roll drive, and these elements make the mill more expensive. Here it makes sense to realize individual stands (usually the leading stands) as six-roll stands with an intermediate roll drive.
The flatness of the strip is significantly affected not only by vertical deflection but also by horizontal deflection of the work rolls and the intermediate rolls.
The horizontal shifting of the work rolls and the intermediate rolls from the center plane of the stand provides the set of rolls with support of a type which significantly decreases the horizontal deflection.
The rolling process can be additionally influenced with respect to flatness and the roll gap by slanting the work rolls. As is described in JP 57 190 704 for four-high rolling stands, the work rolls and the intermediate rolls are simultaneously pivoted relative to each other by the same amount parallel to the plane of the strip around a common pivot point at the center of the roll axis.
In addition, the six-high rolling stand has an additional, rapid adjusting mechanism for intermediate roll bending. In combination with work roll bending, the six-high rolling stand thus has two independent adjusting mechanisms that affect the roll gap. In the first stand, rapid adaptation of the roll gap to the profile of the entering strip for the purpose of avoiding flatness defects is guaranteed. In the last stand, both adjusting mechanisms can be effectively used for flatness control.
Another criterion for the quality of the final product is the surface condition of the exiting strip. The surface of the strip can be systematically predetermined by textured (roughened) and chromium-plated rolls. To prevent marks on the final product caused by the shifting of the wear edges or to prevent rippling on the strip surface caused by the occurrence of relative speed differences across the width of the exiting strip, it is helpful to provide a six-high rolling stand as the last stand of a tandem cold rolling mill. The work rolls are cylindrical or are furnished with a slight camber and are not shifted in the rolling process.
The effective principles described above involve separate stand conceptual designs, since different roll geometries are necessary. In conventional CVC technology, as described in EP 0 049 798 B1, the barrel lengths of the shiftable rolls are always longer than the stationary unshifted rolls by the amount of the axial shifting stroke.
As a result, the barrel edge of the shiftable roll cannot be pushed under the stationary roll barrel. Surface damage and marks are avoided in this way. The work rolls are generally supported over their entire length on the intermediate rolls or backup rolls. In this way, the rolling force applied by the backup rolls is transmitted to the entire length of the work rolls. As a result, the ends of the work rolls, which extend laterally beyond the rolling stock and thus are not involved in the rolling process, are deflected towards the rolling stock by the rolling force applied to them. This detrimental deflection of the work rolls causes upward bending of the middle sections of the roll. This in turn results in insufficient rolling out of the central region of the strip and excessive rolling out of the edges of the strip. These effects come into play especially when rolling conditions vary during operation of the rolling mill and when strips of different widths are being rolled.
By contrast, in the technology of strip edge-oriented shifting, as disclosed in DE 22 06 912 C3, rolls with the same barrel length are used in the entire set of rolls. The shiftable rolls are thus provided with a corresponding geometry at one end in the barrel edge region and with a setback to reduce locally arising load peaks. The effective principle is based on the strip edge-oriented readjustment of the barrel edge, ahead of, at, or even after the strip edge. Especially in the case of six-high rolling stands, the shifting of the intermediate roll below the backup roll allows the effectiveness of the positive work roll bending to be influenced in a systematic way. However, the axial shifting of the rolls in this method has an unfavorable effect on the load distribution in the contact joints. With decreasing strip width, there is a serious increase in the maximum load peak of the contact force distribution.
In DE 36 24 241 C2 (Method for Operating a Rolling Mill for the Production of Rolled Strip), the two methods discussed previously are combined. The objective is to make the unfavorable deflection of the work rolls under rolling force more uniform over the entire spectrum of strip widths arid to increase the effectiveness of the roll bending systems while shortening the shift distances without having to interrupt the continuous rolling operation. This objective is achieved by the strip edge-oriented shifting of intermediate rolls or work rolls with an applied CVC
cross section. The barrel edges of the CVC rolls are positioned in the region of the strip edge. As in the case of the technology of the strip edge-oriented shifting, the set of rolls comprises rolls of equal barrel lengths.
For reasons of economy, an effort is made to make all of the stands uniform, if possible, in order to reduce the expense of maintenance and replacement parts. In the past, therefore, tandem cold rolling mills were designed with the conventional plant layout or with the described technologies throughout.
Summary of the Invention The object of the invention is to realize these technologies/operating modes by a stand conceptual design with a geometrically identical set of rolls that is not limited only to a six-high rolling stand and not only to the intermediate rolls.
The objective with respect to the method is achieved by the combined use of the following technologies within the multiple-stand tandem cold rolling mill:
= use of CVC/CVCPlus technology with CVC roll contours of higher order, wherein each work roll/intermediate roll has a barrel lengthened by the amount of the shifting stroke;
= use of pair-cross (PC) technology, wherein each work roll/intermediate roll can be swiveled parallel to the plane of the strip; and = use of strip edge-oriented shifting of the work rolls/intermediate rolls, wherein each work roll/intermediate roll has a barrel which is lengthened by the amount of the shifting stroke and which has a cylindrical or cambered cross section, and the work rolls/intermediate rolls are each shifted from the neutral shift position by the same amount symmetrically to the center of the stand in the direction of their axes of rotation.
The roll configuration from CVC/CVCPlus technology for a six- high roll stand or a four-high roll stand is used as the basis for the stand conceptual design. The shiftable intermediate roll or work roll has a barrel that is longer by the CVC shifting stroke and is positioned symmetrically in the center of the stand for the neutral shift position.
The work roll/intermediate roll with a longer and symmetrical barrel is used during the strip edge-oriented shifting either with a cylindrical or cambered cross section. By suitable design of a setback in the region of the barrel edge in combination with the superimposed roll cross section and the strip width-dependent optimization of the axial shift position, the deformation behavior of the set of rolls and the effectiveness of the positive work roll bending (six-high rolling stand) can be systematically influenced, and the optimum roll gap can be adjusted.
In addition, barrel regions within the set of rolls are systematically shielded from the distribution of forces by optimization of the shift position of the work rolls/intermediate rolls. Deformations with negative effects that result from this are reduced, since the "principle of the ideal stand" is approached. However, the load distributions that occur in the respective contact joints increase due to the reduced contact lengths.
The stand conceptual designs described above are modified in accordance with the invention in such a way that the roll gap is controlled either by the shifting or the swiveling of the work roll/intermediate roll. A six-high rolling stand is absolutely necessary whenever an additional adjusting mechanism for controlling the edge drop of the strip is to be implemented in the stand. Two mutually independent shifting systems for the profile and flatness are needed for this purpose. The plant layout is substantially determined by these criteria. Depending on the requirements established for the rolling process, the range of plant configurations extends from conventional tandem cold rolling mills consisting of four-high rolling stands, to combined plants consisting of four/six-high rolling stands, to tandem cold rolling mills that consist exclusively of six-high rolling stands. The basic approach for realizing a strip edge-oriented shifting strategy exclusively of the intermediate rolls and exclusively in a six-high rolling stand with the use of a geometrically identical set of rolls is described in detail in DE 100 37 004 Al.
Further advantages, details, and features of the invention are apparent from the following explanations of the various specific embodiments that are schematically illustrated in the drawings. For the sake of clarity, the same rolls are provided with the same reference numbers.
Brief Description of the Drawings -- Figure 1 shows the geometry of the intermediate roll without roll cross-sectional shaping in a six-high rolling stand.
-- Figure 2 shows the geometry of the work roll without roll cross-sectional shaping in a four-high rolling stand.
-- Figure 3 shows the one-sided setback in the area of the barrel edge of a work roll/intermediate roll.
-- Figure 4 shows a stand conceptual design with a lengthened intermediate roll barrel.
-- Figure 5 shows a stand conceptual design with a lengthened work roll barrel.
-- Figures 6a-6c show positioning of the intermediate roll setback.
-- Figures 7a-7c show positioning of the work roll setback.
Detailed Description of the Invention Figures 1 and 2 show the geometry of the intermediate roll 11/work roll 10 without roll cross sectional shaping.
In Figure 1, the shiftable intermediate roll 11, which has a lengthened barrel, is positioned symmetrically with respect to the center Y-Y of the stand between the work roll 10 and the backup roll 12 in the neutral shift position szW = 0. In Figure 2, the work roll 10 has a lengthened barrel and is likewise positioned symmetrically with respect to the center Y-Y of the stand in the neutral shift position SAW = 0.
Figure 3 shows a schematic representation of the appearance and the geometric configuration of a one-sided setback d in the region of the barrel edge of a work roll/intermediate roll 10, 11. A one-sided setback, as used here, is already described in detail and illustrated by a drawing in DE 100 37 004 Al.
The length 1 of the one-sided setback d in the region of a barrel edge of the work roll/intermediate roll 10, 11 is divided into two adjacent regions a and b. In the first, inner region a, beginning at point do, the setback y(x) obeys the equation of the circle (1 - X)2 + y2 = R2, where R
is the radius of the roll. A value d(x) of the setback d of:
Region a:
= (R2 - (R - d) 2) 1/2 d = d (x) = R - (R2 - (1 -X) 2) 1/2 is then obtained for the region a.
If a minimally necessary diameter reduction 2d, which is predetermined as a function of external boundary conditions (rolling force and the resulting roll deformation), is reached, the setback d will run linearly as far as the barrel edge, so that the following is obtained for the region b:
Region b:
= 1 - a d = d(x) = constant.
The transition between region a and region b can be made with or without a continuously differentiable transition. In addition, this transition of the setback can also be made with a sequential setback of the dimension d resulting from the flattening according to a predetermined table. The setback d is then flatter, for example, in the transition region, than a radius and is very much steeper at the end. For reasons related to grinding technology, the transition to the cylindrical part is made with a correspondingly greater step in the transition between a and b (about 2d).
The diameter reduction 2d by the setback is made in such a way that the work roll 10 in a six-high rolling stand can bend freely by the setback d of the intermediate roll 11 without any worry about contact in the region b. In a four-high rolling stand, the setback d serves only for local reduction of the load peaks that arise.
The one-sided setback is normally located on the service side BS for the upper work roll/intermediate roll 10, 11 and on the drive side AS for the lower work roll/intermediate roll 10, 11, as illustrated in Figures 4 and 5. However, the effective principle remains the same if the setback d is placed in the opposite way on the drive side AS for the upper work roll/intermediate roll 10, 11 and on the service side BS for the lower work roll/intermediate roll 10, 11.
Figures 6a to 6c show the axial shifting of the intermediate roll 11 by a shifting stroke m. In Figure 6a, the beginning do of the setback do is positioned outside the strip edge (m = +), in Figure 6b, it is positioned at the strip edge (m = 0), and in Figure 6c, it is positioned inside the strip edge (m = -), i.e., already within the width of the strip. The positioning depends on the strip width and the material properties, so that the elastic behavior of the set of rolls and the effectiveness of the positive work roll bending (six-high rolling stand) can be systematically adjusted.
Finally, Figures 7a to 7c show the strip edge-oriented shifts of the work roll 10, which are carried out in the same way as for the intermediate roll 11 in Figures 6a to 6c.
In different strip width ranges, the shift position is predetermined by piecewise-linear step functions, on which the different positions of the beginning do of the setback d relative to the strip edge are based.
The essential advantage of the stand concept that has been described is that the CVC/CVCP1US technology and the technology of the strip edge-oriented shifting can be realized with only one geometrically identical set of rolls. Different roll types are no longer necessary. The only differences that still exist are in the roll cross section that is provided or in a setback according to predetermined values found as described above. In addition, there is the possibility of combining the two technologies with swiveling of the work rolls/intermediate rolls in the plane of the strip.
List of Reference Symbols work roll 11 intermediate roll 12 backup roll 14 rolled strip a first, inner segment length of d b second, outer segment length of d d setback d1) beginning of d d(x) value of d as a function of x 1 length of d in shifting stroke slaw amount of shift of a work roll szw amount of shift of an intermediate roll x, y Cartesian coordinates AS drive side BS service side R roll radius R., initial roll radius X-X axis of rotation Y-Y center of the stand
Claims (7)
1. Method for the operation of the rolling stands of a tandem cold rolling mill, comprising a pair of work rolls (10) and a pair of backup rolls (12) in the case of four-high rolling stands and, in addition, a pair of intermediate rolls (11) in the case of six-high rolling stands, wherein at least the work rolls (10) and the intermediate rolls (11) interact with axial shifting devices, comprising the combined use of the following technologies within the multiple-stand tandem cold rolling mill:
.cndot. use of CVC/CVCplus technology with CVC roll contours of higher order, wherein each work roll or intermediate roll (10, 11) has a barrel lengthened by the amount of the shifting stroke;
.cndot. use of pair-cross (PC) technology, wherein each work roll or intermediate roll (10, 11) can be swiveled parallel to the plane of the strip;
.cndot. use of strip edge-oriented shifting of the work rolls or intermediate rolls (10, 11), wherein each work roll or intermediate roll (10, 11) has a barrel which is lengthened by the amount of the shifting stroke and which has a cylindrical or cambered cross section, and the work rolls or intermediate rolls (10, 11) are each symmetrically shifted from the neutral shift position (Szw = 0 or S AW = 0) by the same amount symmetrically to the center of the stand (Y-Y) in the direction of their axes of rotation (X-X).
.cndot. use of CVC/CVCplus technology with CVC roll contours of higher order, wherein each work roll or intermediate roll (10, 11) has a barrel lengthened by the amount of the shifting stroke;
.cndot. use of pair-cross (PC) technology, wherein each work roll or intermediate roll (10, 11) can be swiveled parallel to the plane of the strip;
.cndot. use of strip edge-oriented shifting of the work rolls or intermediate rolls (10, 11), wherein each work roll or intermediate roll (10, 11) has a barrel which is lengthened by the amount of the shifting stroke and which has a cylindrical or cambered cross section, and the work rolls or intermediate rolls (10, 11) are each symmetrically shifted from the neutral shift position (Szw = 0 or S AW = 0) by the same amount symmetrically to the center of the stand (Y-Y) in the direction of their axes of rotation (X-X).
2. Method for the operation of the rolling stands of a tandem cold rolling mill, comprising a pair of work rolls (10) and a pair of backup rolls (12) in the case of four-high rolling stands and, in addition, a pair of intermediate rolls (11) in the case of six-high rolling stands, wherein at least the work rolls (10) and the intermediate rolls (11) interact with axial shifting devices, comprising the combined use of the following technologies within the multiple-stand tandem cold rolling mill:
.cndot. use of CVC/CVCplus technology with CVC roll contours of higher order, wherein each work roll or intermediate roll (10, 11) has a barrel lengthened by the amount of the shifting stroke;
.cndot. use of pair-cross (PC) technology, wherein each work roll or intermediate roll (10, 11) can be swiveled parallel to the plane of the strip;
use of strip edge-oriented shifting of the work rolls or intermediate rolls (10, 11), wherein each work roll or intermediate roll (10, 11) has a barrel which is lengthened by the amount of the shifting stroke and which has a cylindrical or cambered cross section, and the work rolls or intermediate rolls (10, 11) are each symmetrically shifted from the neutral shift position (Szw, = a or S AW = 0) by the same amount symmetrically to the center of the stand (Y-Y) in the direction of their axes of rotation (X-X), wherein, to use strip edge-oriented shifting, the work rolls or intermediate rolls (10, 11) are provided with a one-sided setback (d), such that when each work roll or intermediate roll (10, 11) is shifted, the beginning (d o) of the setback (d) is positioned outside the strip edge, at the strip edge, or inside the strip edge so as to be within the width of the strip (14).
.cndot. use of CVC/CVCplus technology with CVC roll contours of higher order, wherein each work roll or intermediate roll (10, 11) has a barrel lengthened by the amount of the shifting stroke;
.cndot. use of pair-cross (PC) technology, wherein each work roll or intermediate roll (10, 11) can be swiveled parallel to the plane of the strip;
use of strip edge-oriented shifting of the work rolls or intermediate rolls (10, 11), wherein each work roll or intermediate roll (10, 11) has a barrel which is lengthened by the amount of the shifting stroke and which has a cylindrical or cambered cross section, and the work rolls or intermediate rolls (10, 11) are each symmetrically shifted from the neutral shift position (Szw, = a or S AW = 0) by the same amount symmetrically to the center of the stand (Y-Y) in the direction of their axes of rotation (X-X), wherein, to use strip edge-oriented shifting, the work rolls or intermediate rolls (10, 11) are provided with a one-sided setback (d), such that when each work roll or intermediate roll (10, 11) is shifted, the beginning (d o) of the setback (d) is positioned outside the strip edge, at the strip edge, or inside the strip edge so as to be within the width of the strip (14).
3. Method in accordance with Claim 1, wherein the shift position of the work roll or intermediate roll (10, 11) in different strip width ranges is predetermined by piecewise-linear step functions which are based on different positions of the beginning (d o) of the setback (d) relative to the edge of the strip (14).
4. Method in accordance with Claim 1, wherein optimum utilization of the combination of technologies within the multiple-stand tandem cold rolling mill is realized by optimized shifting strategies as a function of the strip width.
5. Tandem cold rolling mill, comprising four-high or six-high rolling mills, each with a pair of work rolls (10) and a pair of backup rolls (12) in the case of four-high rolling stands and, in addition, a pair of intermediate rolls (11) in the case of six-high rolling stands, wherein at least the work rolls (10) and the intermediate rolls (11) interact with axial shifting devices, characterized by the fact that the work rolls and intermediate rolls (10, 11) of the rolling stands each have a symmetrical barrel which is lengthened by the amount of the shifting stroke, has a cylindrical or cambered cross section, and is symmetrically positioned in the center of the stand (Y-Y) for the neutral shift position (s zw = 0 or s Aw = 0) , wherein suitable choice of the rolling stands allows .cndot. strip edge-oriented shifting of the work rolls and intermediate rolls (10, 11), .cndot. CVC technology, and .cndot. swiveling of the work rolls (10), PC (pair cross) technology with the multiple-stand tandem cold rolling mill.
6. Tandem cold rolling mill in accordance with Claim 5, wherein the barrel of the work rolls and intermediate rolls (10, 11) is furnished with a one-sided setback (d), whose length (1) is divided into two adjacent regions (a) and (b), such that the first region (a), beginning with the radius (R0), obeys the equation of the circle (1 - x)2 + y2 = R2 and the region (b) runs linearly, from which the following setback (d) or the following diameter reduction (2d) is obtained for these regions:
Region a:
= (R2 - (R - d)z2)1/2 => d = d(x) = R - R 2 - (1 - x)2)1/2 Region b:
= 1 - a => d = d(x) = constant.
Region a:
= (R2 - (R - d)z2)1/2 => d = d(x) = R - R 2 - (1 - x)2)1/2 Region b:
= 1 - a => d = d(x) = constant.
7. Tandem cold rolling mill in accordance with Claim 5, wherein the CVC/CVC plus technology, the technology of strip edge-oriented shifting, and PC technology are realized with only one geometrically identical set of rolls.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10359838 | 2003-12-19 | ||
DE10359838.3 | 2003-12-19 | ||
DE102004020131A DE102004020131A1 (en) | 2003-12-19 | 2004-04-24 | Cold rolling steel mill combines three types of position shifting technology with a uniform frame design |
DE102004020131.5 | 2004-04-24 | ||
PCT/EP2004/013623 WO2005063417A1 (en) | 2003-12-19 | 2004-12-01 | Combined operating modes and frame types in tandem cold rolling mills |
Publications (2)
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CA2548777A1 CA2548777A1 (en) | 2005-07-14 |
CA2548777C true CA2548777C (en) | 2011-10-11 |
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ID=34740506
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Application Number | Title | Priority Date | Filing Date |
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CA2548777A Expired - Fee Related CA2548777C (en) | 2003-12-19 | 2004-12-01 | Combined operating modes and frame types in tandem cold rolling mills |
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US (1) | US20070095121A1 (en) |
EP (1) | EP1699573B1 (en) |
JP (1) | JP2007514548A (en) |
KR (1) | KR101224940B1 (en) |
CN (1) | CN1894053A (en) |
AT (1) | ATE426469T1 (en) |
BR (1) | BRPI0417703A (en) |
CA (1) | CA2548777C (en) |
DE (2) | DE102004020131A1 (en) |
ES (1) | ES2322365T3 (en) |
RU (1) | RU2358819C2 (en) |
TW (1) | TWI324093B (en) |
WO (1) | WO2005063417A1 (en) |
Families Citing this family (6)
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DE102006048427B3 (en) * | 2006-10-12 | 2008-05-21 | Siemens Ag | Rolling mill, retrofitted rolling mill, rolling mill or rolling mill, method for driving a rolling mill and use of a first stand of a rolling mill |
CN101633000B (en) * | 2008-07-22 | 2011-05-11 | 中冶赛迪工程技术股份有限公司 | Axial moving device of intermediate rolls |
RU2492946C1 (en) * | 2012-07-31 | 2013-09-20 | Александр Иванович Трайно | Method of steel strip cold rolling |
EP3124130A1 (en) * | 2015-07-28 | 2017-02-01 | Primetals Technologies Austria GmbH | Roller grinder for targeted prevention of quarter waves |
CN110883102B (en) * | 2019-11-29 | 2021-08-20 | 山东交通学院 | Working roll shifting method for hot-rolled strip steel under same-width rolling condition |
CN111633030B (en) * | 2020-04-30 | 2022-03-18 | 首钢京唐钢铁联合有限责任公司 | Roll shape configuration structure of acid continuous rolling mill and acid continuous rolling mill set |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3245090A1 (en) * | 1982-12-06 | 1984-06-07 | SMS Schloemann-Siemag AG, 4000 Düsseldorf | METHOD AND DEVICE FOR ROLLING METAL STRIPS |
JPS63264204A (en) * | 1987-04-23 | 1988-11-01 | Mitsubishi Heavy Ind Ltd | Rolling mill |
US5174144A (en) * | 1990-04-13 | 1992-12-29 | Hitachi, Ltd. | 4-high rolling mill |
EP0543014B2 (en) * | 1991-05-16 | 2004-10-27 | JFE Steel Corporation | Six-stage rolling mill |
JP2807379B2 (en) * | 1992-02-14 | 1998-10-08 | 株式会社日立製作所 | Tandem rolling mill and work roll cross mill |
JP3127650B2 (en) * | 1993-02-10 | 2001-01-29 | 株式会社日立製作所 | Tandem rolling mill |
JP3209024B2 (en) * | 1995-01-13 | 2001-09-17 | 株式会社日立製作所 | Rolling and cold rolling mills |
JPH08267114A (en) * | 1995-03-31 | 1996-10-15 | Kawasaki Steel Corp | Rolling method for controlling edge drop in cold rolling |
US5655398A (en) * | 1995-05-11 | 1997-08-12 | Danieli United, A Division Of Danieli Corporation | Roll crossing and shifting system |
EP1129796B1 (en) * | 1996-07-18 | 2004-09-29 | JFE Steel Corporation | Rolling method for reducing edge drop of strip |
IT1293773B1 (en) * | 1997-07-24 | 1999-03-10 | Demag Italimpianti Spa | LAMINATION CAGE WITH CROSSED ROLLERS, WITH VARIABLE STRUCTURE. |
DE19736767C2 (en) * | 1997-08-23 | 2003-10-30 | Sms Demag Ag | Roll stand for rolling strips |
JP3803761B2 (en) * | 1997-08-27 | 2006-08-02 | Jfeスチール株式会社 | Rolling mill, its control method and rolling shape control method |
CA2467877C (en) * | 1998-02-27 | 2007-10-30 | Nippon Steel Corporation | A method and a device for calibrating a rolling mill |
US6158260A (en) * | 1999-09-15 | 2000-12-12 | Danieli Technology, Inc. | Universal roll crossing system |
US6220071B1 (en) * | 2000-01-20 | 2001-04-24 | Mill Design & Consulting Services, Llc | Method and apparatus for controlling strip edge relief in a cluster rolling mill |
DE10037004B4 (en) * | 2000-07-29 | 2004-01-15 | Sms Demag Ag | Roll stand for belt edge-oriented shifting of the intermediate rolls in a 6-roll stand |
DE10359402A1 (en) * | 2003-12-18 | 2005-07-14 | Sms Demag Ag | Optimized shift strategies as a function of bandwidth |
-
2004
- 2004-04-24 DE DE102004020131A patent/DE102004020131A1/en not_active Withdrawn
- 2004-12-01 EP EP04803394A patent/EP1699573B1/en not_active Not-in-force
- 2004-12-01 BR BRPI0417703-7A patent/BRPI0417703A/en not_active IP Right Cessation
- 2004-12-01 RU RU2006126054/02A patent/RU2358819C2/en not_active IP Right Cessation
- 2004-12-01 US US10/583,303 patent/US20070095121A1/en not_active Abandoned
- 2004-12-01 DE DE502004009244T patent/DE502004009244D1/en active Active
- 2004-12-01 CN CNA2004800379949A patent/CN1894053A/en active Pending
- 2004-12-01 AT AT04803394T patent/ATE426469T1/en active
- 2004-12-01 KR KR1020067011543A patent/KR101224940B1/en active IP Right Grant
- 2004-12-01 CA CA2548777A patent/CA2548777C/en not_active Expired - Fee Related
- 2004-12-01 WO PCT/EP2004/013623 patent/WO2005063417A1/en active Application Filing
- 2004-12-01 ES ES04803394T patent/ES2322365T3/en active Active
- 2004-12-01 JP JP2006544259A patent/JP2007514548A/en active Pending
- 2004-12-09 TW TW093138101A patent/TWI324093B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
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ATE426469T1 (en) | 2009-04-15 |
DE102004020131A1 (en) | 2005-07-21 |
CA2548777A1 (en) | 2005-07-14 |
BRPI0417703A (en) | 2007-03-20 |
TW200529944A (en) | 2005-09-16 |
CN1894053A (en) | 2007-01-10 |
WO2005063417A1 (en) | 2005-07-14 |
ES2322365T3 (en) | 2009-06-19 |
KR20060130582A (en) | 2006-12-19 |
DE502004009244D1 (en) | 2009-05-07 |
KR101224940B1 (en) | 2013-01-22 |
US20070095121A1 (en) | 2007-05-03 |
RU2006126054A (en) | 2008-01-27 |
RU2358819C2 (en) | 2009-06-20 |
JP2007514548A (en) | 2007-06-07 |
EP1699573A1 (en) | 2006-09-13 |
TWI324093B (en) | 2010-05-01 |
EP1699573B1 (en) | 2009-03-25 |
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