US20080060403A1 - Method for Rolling Rolling Stock Having a Transitional Region - Google Patents
Method for Rolling Rolling Stock Having a Transitional Region Download PDFInfo
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- US20080060403A1 US20080060403A1 US11/579,356 US57935605A US2008060403A1 US 20080060403 A1 US20080060403 A1 US 20080060403A1 US 57935605 A US57935605 A US 57935605A US 2008060403 A1 US2008060403 A1 US 2008060403A1
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- Prior art keywords
- roll
- transitional region
- rolling stock
- mill train
- stands
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
-
- 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
Definitions
- the invention relates to a method for rolling rolling stock in a mill train that has at least two roll stands each having one roll gap, with the rolling stock requiring to be rolled having at least one transitional region.
- the invention relates further to a computing device for appropriately regulating a mill train.
- the rolling stock has a plurality of partial areas that can differ in terms of their dimensions and/or material properties (also temperatures). Two successive partial areas of the rolling stock are joined by means of a transitional region.
- the plurality of partial areas of rolling stock are a result of, for example, supplying metal coils singly and welding them together prior to rolling.
- the partial areas of the rolling stock correspond in this case to individual coils.
- the rolling stock is as a rule separated again into single coils after being rolled.
- DE 101 59 608 A1 describes a rolling method for a strip having one seam weld in a mill train having a plurality of roll stands and at least one draw tension measuring element. According to DE 101 59 608 A1, setting variables for the rolling speed and for screwing down the roll stands are determined as a function of the position of the seam weld within the mill train.
- Known methods for rolling rolling stock having a transitional region operate reliably only when the physical characteristics of said transitional region are such that the change in the at least one dimension and/or at least one material property between the partial area of the rolling stock in front of the transitional region and the partial area behind the transitional region is relatively slight.
- partial areas having extremely different properties and/or dimensions are rolled in direct succession, that will as a rule be associated with substantial disruptions to the process variables. In extreme cases said disruptions can cause the rolling stock to split.
- the object of the invention is to avoid the disadvantages known from the prior art and provide a method with the aid of which rolling stock having at least one transitional region can be reliably rolled, even in the possible presence of in part substantial differences in terms of the dimensions and/or properties of the rolling stock between partial areas of the rolling stock joined by means of a transitional region.
- Said object is achieved by means of a method of the type described in the introduction, with the roll gap of at least one roll stand being opened, when the transitional region's physical characteristics so require, as a function of the position of the transitional region of the rolling stock moving at a speed through the mill train.
- Said object is further achieved by means of a corresponding computing device for regulating the mill train.
- the invention enables rolling stock to be rolled reliably even when successive partial areas thereof differ substantially in terms of, for instance, strip thickness, strip hardness, and/or alloying. According to the invention it is no longer imperative for rolling stock to be assembled in a lengthy planning process from partial areas, which is to say single coils or, as the case may be, single strips, in such a way that the differences between successive strips are relatively only slight.
- partial areas which is to say single coils or, as the case may be, single strips
- production schedules are tight to assemble rolling stock from coils or, as the case may be, strips without taking the individual coils' or, as the case may be, strips' properties or, as the case may be, dimensions into account, and to reliably roll the rolling stock continuously. That will result in a substantial increase in the operating plant's flexibility and reliability.
- the roll gap of at least one roll stand will be opened only in the case of a critical transitional region, which is to say when the physical characteristics of the transitional region so require.
- Critical transitional regions are transitional regions that join partial areas of rolling stock having properties or, as the case may be, dimensions differing in such a way that their transit through a roll stand having a closed roll gap would entail substantial disruptions to the process variables. If a transitional region is critical, its physical characteristics will require a roll gap to be opened. That applies also to the following developments of the invention. Stopping of the operating plant before a critical transitional region enters it is inventively avoided, resulting in an increase in throughput rate.
- said roll stand's roll gap prefferably closed when the critical transitional region has traversed said roll stand.
- the front tension in the rolling stock in front of and behind a roll stand is advantageously equalized before the roll gap of said roll stand is opened so as to minimize the adverse impact on the rolling process taking place on the roll stands involved, which is to say particularly on said roll stand and those surrounding it.
- the rotating speed of at least one of the rolls, in particular the work rolls, of the roll stand is advantageously matched to the speed of the rolling stock when the roll gap is closed. Controlled closing of the roll gap in this manner using speed synchronizing will largely prevent undesired roll-surface damage.
- the speed of the rolling stock is therein advantageously measured.
- the accuracy of synchronizing will be enhanced thereby.
- the speed of the rolling stock is advantageously determined with the aid of at least one model. A particularly efficient method of speed determining will be provided thereby.
- the reduction in a roll stand is advantageously regulated in a time-optimized manner with regard to the position of the transitional region in the mill train.
- the reduction in a roll stand is diminished when the transitional region is approached, with compensatory adjusting of the change in peripheral precession to the speed of the roll stand's rolls.
- the roll gap is advantageously eased through controlled opening of the screw-down device.
- the relational speeds of the mill train's other drives are preferably additionally adjusted accordingly. Disrupting of the process variables will in this way be prevented.
- the front tension in the rolling stock in front of a roll stand is advantageously regulated by way of the other roll drives' rotating speed as long as the reduction in said roll stand has been reduced around the critical transitional region.
- FIG. 1 shows a mill train having computing equipment
- FIGS. 2 and 3 show examples of rolling stock having a seam weld
- FIG. 4 shows examples of rolling stock having a wedge
- FIG. 5 shows rolling stock having a transitional region between two roll stands
- FIG. 6 is a schematic of the curve of the front tension with roll gaps closed
- FIG. 7 shows-an example of front-tension regulating in the rolling stock.
- FIG. 1 shows a mill train 10 for rolling rolling stock 1 that moves through the mill train 10 at a speed v.
- the mill train 10 has at least two roll stands 2 which rolling stock 1 traverses. Rolling stock 1 traverses the mill train 10 in the direction of strip travel x. Rolling stock 1 , preferably a metal strip, is continuously rolled in the mill train 10 .
- the mill train 10 is preferably a cold-rolling mill train for steel having as a rule more than three roll stands 2 . Located downstream of the roll stands 2 is a coiling device 3 on which the rolled rolling stock 1 is coiled.
- the mill train 10 in particular the stands 2 of the mill train 10 , is/are coupled to a computing device 4 .
- a computing device 4 Located in the mill train 10 are generators, not shown further in the drawing, which convey, for example, measuring signals to the computing device 4 .
- the computing device 4 conveys preferably control signals to actuators in the mill train 10 .
- the computing device 4 preferably has a model 12 that models processes in the mill train 10 with the aid of data relating to, for example, rolling stock 1 .
- the directions indicated in FIG. 1 namely the direction of strip travel x, the direction of strip thickness y, and the direction of strip width z, principally relate only to the position of the rolling stock 1 and the position of the roll stands 2 , not, though, to the arrangement of the computing device 4 in relation to the mill train 10 .
- the roll stands 2 each have a roll gap 11 , only intimated in FIG. 1 .
- a roll stand 2 has at least two work rolls of which at least one is arranged in the direction of strip thickness y above the rolling stock 1 and at least one in the direction of strip thickness y below the rolling stock 1 .
- the roll gap 11 is located between said work rolls.
- Back-up rolls likewise not shown further in the drawing, are as a rule provided in addition to the work rolls.
- rolling stock 1 for example sheet metal
- continuous mill trains 10 with the coils that are as a rule supplied singly being welded together in the run-in of the production plant, of which the mill train 10 is also a constituent part.
- the mill train 10 rolls the rolling stock 1 , consisting of a plurality of coils welded together, continuously, which is to say without stopping.
- the rolling stock is separated again into single coils. That is done by, for example, shearing or cutting.
- rolling stock 1 is rolled in a continuous mill train 10 without taking account of the properties of the individual coils forming the rolling stock 1 .
- the individual coils differ in terms of, for example, thickness and/or width in the direction of strip thickness y or, as the case may be, the direction of strip width z and/or with respect to their alloying and/or hardness.
- FIG. 2 shows a section of rolling stock 1 having two partial areas 1 a, 1 b that correspond to two different coils and differ in thickness.
- the two partial areas 1 a, 1 b of the rolling stock 1 are joined by a transitional region 9 , with the transitional region 9 having a seam weld 5 .
- FIG. 3 shows a section of rolling stock 1 having two partial areas 1 a, 1 b each corresponding to different coils.
- the two partial areas 1 a, 1 b are joined by a transitional region 9 , with the transitional region 9 having a seam weld 5 .
- the seam weld 5 is only intimated in both FIG. 3 and FIG. 2 .
- the partial areas 1 a, 1 b or, as the case may be, coils shown in FIG. 3 differ in width.
- FIG. 4 shows a section of rolling stock 1 , with two partial areas 1 a, 1 b being in this case joined by a transitional region 9 between the two partial areas 1 a, 1 b corresponding preferably to two coils.
- the transitional region 9 is in FIG. 4 shown by way of example only as being almost wedge-shaped.
- the transitional region 9 has in many cases a thickness curve differing from that shown.
- the thickness of the rolling stock 1 in the transitional region 9 can initially also increase then decrease. What was said previously applies analogously to the width of the rolling stock 1 .
- Properties such as strip thickness, strip width, strip hardness, and/or alloying change at the transitional region 9 . If the rolling stock is assembled with no account taken of the properties of the coils or, as the case may be, subsequent partial areas, then properties of the rolling stock 1 can change abruptly particularly at the seam welds 5 .
- FIG. 5 shows by way of example a transitional region 9 embodied as a wedge 6 between two roll stands 2 ′ and 2 ′′, with the roll stand 2 ′ being arranged in front of the roll stand 2 ′′.
- the roll stand 2 ′ has a top work roll 7 ′ and a bottom work roll 8 ′.
- the roll stand 2 ′′ likewise has a top work roll 7 ′′ and a bottom work roll 8 ′′.
- the partial areas 1 a, 1 b of the rolling stock 1 have on the one hand a difference in strip thickness already present prior to run-in into the first roll stand 2 .
- the strip thickness of the rolling stock 1 also changes during traversing of the roll stand 2 ′, 2 ′′ with a closed roll gap 11 ′, 11 ′′.
- the partial area 1 b of the rolling stock 1 has a strip thickness h 1 that is greater than its strip thickness h 2 on exiting the roll stand 2 ′.
- the strip thickness h 3 before entering the roll stand 2 ′′ is greater than the strip thickness h 4 on exiting the roll stand 2 ′′.
- the difference between the strip thicknesses h 1 and h 2 or, as the case may be, h 3 and h 4 is due to the reduction in the roll stands 2 ′, 2 ′′.
- the reduction occurring in a roll stand 2 , 2 ′, 2 ′′ is due to the rolling force exerted by the work rolls 7 ′, 7 ′′, 8 ′, 8 ′′ on the rolling stock 1 .
- the roll gap 11 , 11 ′, 11 ′′′ is said to be closed when both the at least one top and the at least one bottom work roll 7 ′, 7 ′′ or, as the case may be, 8 ′, 8 ′′ of a roll stand 2 , 2 ′, 2 ′′ are in contact with the rolling stock 1 or, as the case may be, exert a rolling force on the rolling stock 1 .
- the roll gap 11 , 11 ′, 11 ′′ of a roll stand 2 , 2 ′, 2 ′′ is open when in a roll stand 2 , 2 ′, 2 ′′ the rolling stock 1 is not in contact with the at least one work roll 7 ′, 7 ′′ or 8 ′, 8 ′′, in particular the at least one top work roll 7 ′, 7 ′′, at least on one side of the rolling stock 1 in the direction of strip thickness y, in particular on the top side of the rolling stock 1 .
- the rolling stock 1 sometimes has one or more transitional regions 9 due to whose physical characteristics a traversing by a transitional region 9 of said type of a roll stand 2 having a closed roll gap 11 would lead to substantial disruptions in the process variables.
- the transitional region 9 will exhibit said type of critical physical characteristics when the partial areas 1 a, 1 b, joined by the transitional region 9 , of rolling stock 1 differ substantially in at least one of their properties and/or at least one dimension.
- a considerable risk associated with a transitional region 9 that is critical in this way is that the rolling stock 1 will split when traversing a closed roll gap 11 .
- the roll gap 11 of a roll stand 2 is therefore opened as a function of the position of said type of transitional region 9 . If a transitional region 9 of a rolling stock 1 is moving at a speed v through the mill train 10 , then the roll gap 11 of a roll stand 2 will be opened if the physical characteristics of said transitional region 9 so require.
- a critical transitional region 9 traverses the roll stands 2 of the mill train 10 successively.
- the computing device 4 therein drives the mill train 10 in such a way that the roll gaps 11 of the roll stands 2 will be opened stand by stand and in parallel with the critical transitional region's position as the rolling stock 1 moves.
- a roll gap 11 ′′ of a roll stand 2 ′′′ will therein be opened no later than when the critical transitional region 9 reaches said roll stand 2 ′′.
- the roll gap 11 of a roll stand 2 will preferably not be opened until shortly before a critical transitional region 9 runs into said roll stand 2 , and it will be closed when the critical transitional region 9 has traversed the roll stand 2 .
- At most one roll gap 11 of the roll stands 2 is open or, as the case may be, in particular fully open at a specific instant while the rolling stock 1 is being moved through the mill train.
- the roll gaps 11 of individual roll stands 2 being opened only as briefly as possible, the portion of spoilage will be very small and an extremely large portion of the rolling stock 1 can be rolled in a controlled manner.
- FIG. 6 is a schematic of the curve of the front tension T over the direction of strip travel x in a mill train 10 .
- Located at the positions x 1 , x 2 , x 3 , x 4 are stands 2 of the mill train.
- a coiling device 3 is arranged at the position x 5 .
- the front tension T in the rolling stock 1 reduces behind the first roll stand 2 at the position x 1 at each roll stand 2 up to the coiling device 3 .
- the front tension T in the rolling stock 1 in front of and behind the roll stand 2 is equalized before the roll gap 11 of a roll stand 2 is opened. This means that if the roll gap 11 of a roll stand 2 is being opened, the front tension T in the environs of said roll stand 2 will ideally be constant shortly before the roll gap 11 is opened, while it is being opened, and briefly thereafter.
- the roll gap 11 is preferably eased through controlled opening of the screw-down device in the roll stand 2 depending on the transition to a position-regulated or rolling-force-regulated operating mode, with the relational speed of the drives of the other roll stands 2 of the mill train 10 then being adjusted accordingly. Disrupting of the process variables is in this way prevented.
- the relational speed is the speed in a roll stand 2 relative to the other roll stands 2 of the mill train 10 .
- the roll gap 11 will be opened. If a roll gap 11 has been opened owing to a critical transitional region 9 , it will be closed in a controlled manner when the critical transitional region 9 has passed through until contact is made with the strip.
- the roll speed is therein synchronized with the measured and/or modeled speed v of the rolling stock 1 .
- FIG. 7 shows two roll stands 2 ′ and 2 ′′, with the roll stand 2 ′′ being located downstream of the roll stand 2 ′.
- Both roll stands 2 ′ and 2 ′′ have a roll-stand screw-down device 2 a ′ or, as the case may be, 2 a ′′ and a roll-stand drive 2 b ′ or, as the case may be, 2 b ′′.
- a front-tension regulator 13 is provided. Measurement variables and/or values, determined with the aid of models, for the front tension T in the rolling stock 1 between the two roll stands 2 ′ and 2 ′′ are advantageously conveyed to the front-tension regulator 13 . Described below is an advantageous variant of inventive front-tension regulating in the rolling stock 1 in front of the roll stand 2 ′′.
- the front tension T is regulated via the backward slip of the roll stand 2 ′′ by means of the roll-stand screw-down device 2 a ′′ of the roll stand 2 ′′. So long as the reduction in the roll stand 2 ′′ is being diminished around the critical transitional region 9 , the front-tension regulator 13 will adjust the front tension T by means of the rotating speed of the roll-stand drive 2 b ′ of the roll stand 2 ′.
- the invention relates to a method for rolling rolling stock 1 in a mill train 10 having at least two roll stands 2 , with each roll stand 2 having a roll gap 11 and with the rolling stock 1 requiring to be rolled having at least one transitional region 9 .
- a critical transitional region 9 traverses the mill train 10
- the roll gaps 11 of the at least two roll stands 2 will be closed and opened successively in the direction of strip travel x as a function of the position of the transitional region 9 moving at a speed v through the mill train 10 .
- the roll gaps 11 are opened in parallel with the position of the critical transitional region 9 with the rolling stock 1 being moved.
- a transitional region 9 is critical if its physical characteristics require roll gaps 11 to be opened.
- the changes in at least one of the dimensions or, as the case may be, properties such as the hardness or alloying of the rolling stock 1 around the transitional region 9 could, with the roll gap 11 closed, lead to substantial disruptions in the process variables or, as the case may be, cause the rolling stock 1 to split.
- Inventive stand-by-stand opening of the roll gaps 11 with the plant running will also enable controlled transiting by a rolling stock 1 exhibiting extreme changes in dimension and/or hardness with an ensuing deviation length that is slight.
- Equalizing of the tensile force will prevent slipping of the rolls, in particular of the work rolls 7 ′, 7 ′′, 8 ′, 8 ′′ of the roll stands 2 .
- any equalizing operations then be performed on the front tension T in the adjacent stands when the roll gap 11 is opened in a roll stand 2 .
- the speed v of the rolling stock 1 is measured and/or determined with the aid of at least one model 12 implemented in the computing device 4 . Placing the work rolls 7 ′, 7 ′′, 8 ′, 8 ′′ onto the rolling stock 1 with a synchronized roll speed will prevent damage to the rolls. Time-optimized opening and closing of the roll gap 11 will minimize the length of deviation.
- the position of the transitional region 9 in the mill train 10 is tracked from a synchronizing point 8 , sited preferably at the entrance of mill train 10 , by means of differential speed monitoring.
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- Engineering & Computer Science (AREA)
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Abstract
The invention relates to a method for rolling a product in a rolling train comprising at least two roll stands having a roll gap, the product to be rolled comprising a transition region. If a critical transition region crosses the rolling train, the roll gaps of the roll stands are successively opened and closed according to the position of the transition region moving at speed through the rolling train, in the direction of the direction of travel of the conveyor. The opening of the roll gaps occurs parallel to the position of the critical transition region when the product is displaced. A transition region is critical when the structure requires the roll gaps to be opened. The inventive opening of the roll gaps, when the device is moving, enables the controlled transition of a product to be rolled with extreme variations in dimensions and/or hardness, for a shorter length.
Description
- This application is the US National Stage of International Application No. PCT/EP2005/051943, filed Apr. 28, 2005 and claims the benefits of German Patent application No. 10 2004 022 334.3 filed May 6, 2004. All of the applications are incorporated by reference herein in their entirety.
- The invention relates to a method for rolling rolling stock in a mill train that has at least two roll stands each having one roll gap, with the rolling stock requiring to be rolled having at least one transitional region. The invention relates further to a computing device for appropriately regulating a mill train.
- Particularly in the case of a continuously operated mill train the rolling stock has a plurality of partial areas that can differ in terms of their dimensions and/or material properties (also temperatures). Two successive partial areas of the rolling stock are joined by means of a transitional region. The plurality of partial areas of rolling stock are a result of, for example, supplying metal coils singly and welding them together prior to rolling. The partial areas of the rolling stock correspond in this case to individual coils. The rolling stock is as a rule separated again into single coils after being rolled.
- DE 101 59 608 A1 describes a rolling method for a strip having one seam weld in a mill train having a plurality of roll stands and at least one draw tension measuring element. According to DE 101 59 608 A1, setting variables for the rolling speed and for screwing down the roll stands are determined as a function of the position of the seam weld within the mill train.
- Known methods for rolling rolling stock having a transitional region operate reliably only when the physical characteristics of said transitional region are such that the change in the at least one dimension and/or at least one material property between the partial area of the rolling stock in front of the transitional region and the partial area behind the transitional region is relatively slight. When, according to known methods, partial areas having extremely different properties and/or dimensions are rolled in direct succession, that will as a rule be associated with substantial disruptions to the process variables. In extreme cases said disruptions can cause the rolling stock to split.
- The object of the invention is to avoid the disadvantages known from the prior art and provide a method with the aid of which rolling stock having at least one transitional region can be reliably rolled, even in the possible presence of in part substantial differences in terms of the dimensions and/or properties of the rolling stock between partial areas of the rolling stock joined by means of a transitional region.
- Said object is achieved by means of a method of the type described in the introduction, with the roll gap of at least one roll stand being opened, when the transitional region's physical characteristics so require, as a function of the position of the transitional region of the rolling stock moving at a speed through the mill train. Said object is further achieved by means of a corresponding computing device for regulating the mill train.
- The invention enables rolling stock to be rolled reliably even when successive partial areas thereof differ substantially in terms of, for instance, strip thickness, strip hardness, and/or alloying. According to the invention it is no longer imperative for rolling stock to be assembled in a lengthy planning process from partial areas, which is to say single coils or, as the case may be, single strips, in such a way that the differences between successive strips are relatively only slight. Thus, for example, it is possible according to the invention when production schedules are tight to assemble rolling stock from coils or, as the case may be, strips without taking the individual coils' or, as the case may be, strips' properties or, as the case may be, dimensions into account, and to reliably roll the rolling stock continuously. That will result in a substantial increase in the operating plant's flexibility and reliability.
- The roll gap of at least one roll stand will be opened only in the case of a critical transitional region, which is to say when the physical characteristics of the transitional region so require. Critical transitional regions are transitional regions that join partial areas of rolling stock having properties or, as the case may be, dimensions differing in such a way that their transit through a roll stand having a closed roll gap would entail substantial disruptions to the process variables. If a transitional region is critical, its physical characteristics will require a roll gap to be opened. That applies also to the following developments of the invention. Stopping of the operating plant before a critical transitional region enters it is inventively avoided, resulting in an increase in throughput rate.
- It is expedient for a roll stand's roll gap to be opened no later than when the critical transitional region of the rolling stock has reached said roll stand.
- In each case no more than one of the roll gaps of the mill train's roll stands is advantageously open at any instant within the method's application. According to said development of the invention and that described in the preceding, as much of the rolling stock as possible will be rolled in accordance with the required product properties and the portion of spoilage thus significantly reduced.
- It is furthermore expedient for said roll stand's roll gap to be closed when the critical transitional region has traversed said roll stand.
- The front tension in the rolling stock in front of and behind a roll stand is advantageously equalized before the roll gap of said roll stand is opened so as to minimize the adverse impact on the rolling process taking place on the roll stands involved, which is to say particularly on said roll stand and those surrounding it.
- The rotating speed of at least one of the rolls, in particular the work rolls, of the roll stand is advantageously matched to the speed of the rolling stock when the roll gap is closed. Controlled closing of the roll gap in this manner using speed synchronizing will largely prevent undesired roll-surface damage.
- The speed of the rolling stock is therein advantageously measured. The accuracy of synchronizing will be enhanced thereby.
- The speed of the rolling stock is advantageously determined with the aid of at least one model. A particularly efficient method of speed determining will be provided thereby.
- The reduction in a roll stand is advantageously regulated in a time-optimized manner with regard to the position of the transitional region in the mill train. The reduction in a roll stand is diminished when the transitional region is approached, with compensatory adjusting of the change in peripheral precession to the speed of the roll stand's rolls.
- Before a transitional region's transit, the roll gap is advantageously eased through controlled opening of the screw-down device. The relational speeds of the mill train's other drives are preferably additionally adjusted accordingly. Disrupting of the process variables will in this way be prevented.
- The front tension in the rolling stock in front of a roll stand is advantageously regulated by way of the other roll drives' rotating speed as long as the reduction in said roll stand has been reduced around the critical transitional region.
- Further advantages and details will emerge from the following description of exemplary embodiments in conjunction with the drawings, in which:
-
FIG. 1 shows a mill train having computing equipment, -
FIGS. 2 and 3 show examples of rolling stock having a seam weld, -
FIG. 4 shows examples of rolling stock having a wedge, -
FIG. 5 shows rolling stock having a transitional region between two roll stands, -
FIG. 6 is a schematic of the curve of the front tension with roll gaps closed, -
FIG. 7 shows-an example of front-tension regulating in the rolling stock. -
FIG. 1 shows amill train 10 for rolling rollingstock 1 that moves through themill train 10 at a speed v. Themill train 10 has at least two roll stands 2 which rollingstock 1 traverses. Rollingstock 1 traverses themill train 10 in the direction of strip travel x. Rollingstock 1, preferably a metal strip, is continuously rolled in themill train 10. Themill train 10 is preferably a cold-rolling mill train for steel having as a rule more than three roll stands 2. Located downstream of theroll stands 2 is acoiling device 3 on which the rolledrolling stock 1 is coiled. - The mill train 10, in particular the
stands 2 of themill train 10, is/are coupled to acomputing device 4. Located in themill train 10 are generators, not shown further in the drawing, which convey, for example, measuring signals to thecomputing device 4. Thecomputing device 4 conveys preferably control signals to actuators in themill train 10. - The
computing device 4 preferably has amodel 12 that models processes in themill train 10 with the aid of data relating to, for example, rollingstock 1. - The directions indicated in
FIG. 1 , namely the direction of strip travel x, the direction of strip thickness y, and the direction of strip width z, principally relate only to the position of therolling stock 1 and the position of the roll stands 2, not, though, to the arrangement of thecomputing device 4 in relation to themill train 10. The roll stands 2 each have aroll gap 11, only intimated inFIG. 1 . Aroll stand 2 has at least two work rolls of which at least one is arranged in the direction of strip thickness y above the rollingstock 1 and at least one in the direction of strip thickness y below the rollingstock 1. Theroll gap 11 is located between said work rolls. Back-up rolls, likewise not shown further in the drawing, are as a rule provided in addition to the work rolls. - In particular in the case of cold rolling, rolling
stock 1, for example sheet metal, is increasingly produced in continuous mill trains 10, with the coils that are as a rule supplied singly being welded together in the run-in of the production plant, of which themill train 10 is also a constituent part. Themill train 10 rolls the rollingstock 1, consisting of a plurality of coils welded together, continuously, which is to say without stopping. In the production plant's run-out the rolling stock is separated again into single coils. That is done by, for example, shearing or cutting. Particularly when production schedules are tight, rollingstock 1 is rolled in acontinuous mill train 10 without taking account of the properties of the individual coils forming therolling stock 1. The individual coils differ in terms of, for example, thickness and/or width in the direction of strip thickness y or, as the case may be, the direction of strip width z and/or with respect to their alloying and/or hardness. -
FIG. 2 shows a section of rollingstock 1 having twopartial areas partial areas rolling stock 1 are joined by atransitional region 9, with thetransitional region 9 having aseam weld 5. -
FIG. 3 shows a section of rollingstock 1 having twopartial areas partial areas transitional region 9, with thetransitional region 9 having aseam weld 5. Theseam weld 5 is only intimated in bothFIG. 3 andFIG. 2 . Thepartial areas FIG. 3 differ in width. -
FIG. 4 shows a section of rollingstock 1, with twopartial areas transitional region 9 between the twopartial areas transitional region 9 is inFIG. 4 shown by way of example only as being almost wedge-shaped. Thetransitional region 9 has in many cases a thickness curve differing from that shown. Thus the thickness of therolling stock 1 in thetransitional region 9 can initially also increase then decrease. What was said previously applies analogously to the width of therolling stock 1. - Properties such as strip thickness, strip width, strip hardness, and/or alloying change at the
transitional region 9. If the rolling stock is assembled with no account taken of the properties of the coils or, as the case may be, subsequent partial areas, then properties of therolling stock 1 can change abruptly particularly at the seam welds 5. -
FIG. 5 shows by way of example atransitional region 9 embodied as awedge 6 between two roll stands 2′ and 2″, with the roll stand 2′ being arranged in front of theroll stand 2″. The roll stand 2′ has a top work roll 7′ and abottom work roll 8′. The roll stand 2″ likewise has a top work roll 7″ and abottom work roll 8″. Located between the top work roll 7′ or, as the case may be, 7″ and thebottom work roll 8′ or, as the case may be, 8″ of aroll stand 2′ or, as the case may be, 2″ is theroll gap 11′ or, as the case may be, 11″. - The
partial areas rolling stock 1 have on the one hand a difference in strip thickness already present prior to run-in into thefirst roll stand 2. On the other hand, the strip thickness of therolling stock 1 also changes during traversing of the roll stand 2′, 2″ with aclosed roll gap 11′, 11″. Thus before entering the roll stand 2′ thepartial area 1 b of therolling stock 1 has a strip thickness h1 that is greater than its strip thickness h2 on exiting the roll stand 2′. Likewise, the strip thickness h3 before entering theroll stand 2″ is greater than the strip thickness h4 on exiting theroll stand 2″. The difference between the strip thicknesses h1 and h2 or, as the case may be, h3 and h4 is due to the reduction in the roll stands 2′, 2″. - The reduction occurring in a
roll stand stock 1. Theroll gap roll stand stock 1 or, as the case may be, exert a rolling force on the rollingstock 1. Theroll gap roll stand roll stand stock 1 is not in contact with the at least one work roll 7′, 7″ or 8′, 8″, in particular the at least one top work roll 7′, 7″, at least on one side of therolling stock 1 in the direction of strip thickness y, in particular on the top side of therolling stock 1. - As already described in the foregoing, the rolling
stock 1 sometimes has one or moretransitional regions 9 due to whose physical characteristics a traversing by atransitional region 9 of said type of aroll stand 2 having aclosed roll gap 11 would lead to substantial disruptions in the process variables. Thetransitional region 9 will exhibit said type of critical physical characteristics when thepartial areas transitional region 9, of rollingstock 1 differ substantially in at least one of their properties and/or at least one dimension. A considerable risk associated with atransitional region 9 that is critical in this way is that the rollingstock 1 will split when traversing aclosed roll gap 11. Theroll gap 11 of aroll stand 2 is therefore opened as a function of the position of said type oftransitional region 9. If atransitional region 9 of arolling stock 1 is moving at a speed v through themill train 10, then theroll gap 11 of aroll stand 2 will be opened if the physical characteristics of saidtransitional region 9 so require. - During continuous rolling operations a critical
transitional region 9 traverses the roll stands 2 of themill train 10 successively. Thecomputing device 4 therein drives themill train 10 in such a way that theroll gaps 11 of the roll stands 2 will be opened stand by stand and in parallel with the critical transitional region's position as the rollingstock 1 moves. Aroll gap 11″ of aroll stand 2′″ will therein be opened no later than when the criticaltransitional region 9 reaches said roll stand 2″. Theroll gap 11 of aroll stand 2 will preferably not be opened until shortly before a criticaltransitional region 9 runs into saidroll stand 2, and it will be closed when the criticaltransitional region 9 has traversed theroll stand 2. Preferably at most oneroll gap 11 of the roll stands 2 is open or, as the case may be, in particular fully open at a specific instant while the rollingstock 1 is being moved through the mill train. As a consequence of theroll gaps 11 of individual roll stands 2 being opened only as briefly as possible, the portion of spoilage will be very small and an extremely large portion of therolling stock 1 can be rolled in a controlled manner. Alongside the saving in time, this is a major advantage compared to what are termed “open-gap” processes according to which amill train 10 is stopped before a criticaltransitional region 9 is run in, all theroll gaps transitional region 9 is driven through theentire mill train 10 with theroll gaps roll gaps -
FIG. 6 is a schematic of the curve of the front tension T over the direction of strip travel x in amill train 10. Located at the positions x1, x2, x3, x4 are stands 2 of the mill train. Acoiling device 3 is arranged at the position x5. During regular rolling operations the front tension T in the rollingstock 1 reduces behind thefirst roll stand 2 at the position x1 at each roll stand 2 up to thecoiling device 3. To prevent therolling stock 1 from impacting or, as the case may be, splitting when aroll gap 11 is opened, the front tension T in the rollingstock 1 in front of and behind theroll stand 2 is equalized before theroll gap 11 of aroll stand 2 is opened. This means that if theroll gap 11 of aroll stand 2 is being opened, the front tension T in the environs of said roll stand 2 will ideally be constant shortly before theroll gap 11 is opened, while it is being opened, and briefly thereafter. - It is furthermore advantageous for the reduction in a
roll stand 2 to be diminished in a time-optimized manner with compensatory adjusting of the change in peripheral precession to the roll speed. Theroll gap 11 is preferably eased through controlled opening of the screw-down device in theroll stand 2 depending on the transition to a position-regulated or rolling-force-regulated operating mode, with the relational speed of the drives of the other roll stands 2 of themill train 10 then being adjusted accordingly. Disrupting of the process variables is in this way prevented. The relational speed is the speed in aroll stand 2 relative to the other roll stands 2 of themill train 10. - Should it not be possible to reliably roll a
transitional region 9 through controlled opening of the screw-down device with theroll gap 11 closed, then—as described previously—theroll gap 11 will be opened. If aroll gap 11 has been opened owing to a criticaltransitional region 9, it will be closed in a controlled manner when the criticaltransitional region 9 has passed through until contact is made with the strip. The roll speed is therein synchronized with the measured and/or modeled speed v of therolling stock 1. -
FIG. 7 shows two roll stands 2′ and 2″, with theroll stand 2″ being located downstream of the roll stand 2′. Both roll stands 2′ and 2″ have a roll-stand screw-downdevice 2 a′ or, as the case may be, 2 a″ and a roll-stand drive 2 b′ or, as the case may be, 2 b″. A front-tension regulator 13 is provided. Measurement variables and/or values, determined with the aid of models, for the front tension T in the rollingstock 1 between the two roll stands 2′ and 2″ are advantageously conveyed to the front-tension regulator 13. Described below is an advantageous variant of inventive front-tension regulating in the rollingstock 1 in front of theroll stand 2″. During standard rolling operations the front tension T is regulated via the backward slip of theroll stand 2″ by means of the roll-stand screw-downdevice 2 a″ of theroll stand 2″. So long as the reduction in theroll stand 2″ is being diminished around the criticaltransitional region 9, the front-tension regulator 13 will adjust the front tension T by means of the rotating speed of the roll-stand drive 2 b′ of the roll stand 2′. - The idea underlying the invention can be summarized substantially as follows:
- The invention relates to a method for rolling
rolling stock 1 in amill train 10 having at least two roll stands 2, with each roll stand 2 having aroll gap 11 and with the rollingstock 1 requiring to be rolled having at least onetransitional region 9. When a criticaltransitional region 9 traverses themill train 10, theroll gaps 11 of the at least two roll stands 2 will be closed and opened successively in the direction of strip travel x as a function of the position of thetransitional region 9 moving at a speed v through themill train 10. Theroll gaps 11 are opened in parallel with the position of the criticaltransitional region 9 with the rollingstock 1 being moved. Atransitional region 9 is critical if its physical characteristics requireroll gaps 11 to be opened. The changes in at least one of the dimensions or, as the case may be, properties such as the hardness or alloying of therolling stock 1 around thetransitional region 9 could, with theroll gap 11 closed, lead to substantial disruptions in the process variables or, as the case may be, cause therolling stock 1 to split. Inventive stand-by-stand opening of theroll gaps 11 with the plant running will also enable controlled transiting by a rollingstock 1 exhibiting extreme changes in dimension and/or hardness with an ensuing deviation length that is slight. - Equalizing of the tensile force will prevent slipping of the rolls, in particular of the work rolls 7′, 7″, 8′, 8″ of the roll stands 2. Nor will any equalizing operations then be performed on the front tension T in the adjacent stands when the
roll gap 11 is opened in aroll stand 2. The speed v of therolling stock 1 is measured and/or determined with the aid of at least onemodel 12 implemented in thecomputing device 4. Placing the work rolls 7′, 7″, 8′, 8″ onto the rollingstock 1 with a synchronized roll speed will prevent damage to the rolls. Time-optimized opening and closing of theroll gap 11 will minimize the length of deviation. - The position of the
transitional region 9 in themill train 10 is tracked from asynchronizing point 8, sited preferably at the entrance ofmill train 10, by means of differential speed monitoring.
Claims (20)
1.-13. (canceled)
14. A method for rolling a material in a mill train, comprising:
providing a rolling stock material having a transitional region;
providing a plurality of roll stands each having a roll gap; and
opening the roll gap of at least one of the roll stands as required by a physical characteristic of the transitional region as a function of a position of the transitional region of the rolling stock moving at a speed through the mill train and wherein a tension in the rolling stock in front of and behind the one of the roll stands is equalized before opening the roll gap.
15. The method as claimed in claim 14 , wherein the roll gap is opened before the transitional region has reached the roll stand.
16. The method as claimed in claim 15 , wherein only one of the roll gaps in the mill train is opened at a time.
17. The method as claimed in 16, wherein the roll gap is-closed when the transitional region has traversed the roll stand.
18. The method as claimed in claim 17 , wherein a rotating speed of a roll of one of the roll stands is matched to a linear speed of the rolling stock when the roll gap is closed.
19. The method as claimed in claim 18 , further comprising measuring the linear speed of the rolling stock.
20. The method as claimed in claim 18 , wherein the linear speed of the rolling stock is determined by a model.
21. The method as claimed in claim 18 , wherein a reduction in a roll gap is regulated with regard to the position of the transitional region relative to the mill train.
22. The method as claimed in claim 21 , wherein the roll gap is increased by opening a screw-down device before the transit of the transitional region.
23. The method as claimed in claim 22 , further comprising adjusting relational speeds of drives of the other roll stands of the mill train.
24. The method as claimed in claim 23 , wherein the tension of the rolling stock in front of the roll stand is regulated based on a rotating speed of drives of the remaining roll stands if the reduction in the roll stand has been reduced around a critical transitional region.
25. A computing device, comprising:
a random access memory module;
a non-volatile data storage device operatively connected to the memory module; and
an executable program stored in the storage device that controls a mill train, by:
providing a plurality of roll stands each having a roll gap, and
opening the roll gap of at least one of the roll stands when a physical characteristic of a transitional region of a roll stock material requires as a function of the position of the transitional region of the rolling stock moving at a speed through the mill train,
wherein a tension in the rolling stock in front of and behind the roll stand is equalized before opening the roll gap.
26. The computing device as claimed in claim 25 , further comprising opening the roll gap before the transitional region reaches the roll stand.
27. The computing device as claimed in claim 26 , wherein only one of the roll gaps in the mill train is opened at a time.
28. The computing device as claimed in claim 27 , further comprising closing the roll gap when the transitional region has traversed the roll stand.
29. The computing device as claimed in claim 28 , wherein a rotating speed of a roll of one of the roll stands is matched to a linear speed of the rolling stock when the roll gap is closed.
30. A method for rolling a rolling stock material having at least one transitional region in a mill train, comprising:
providing a plurality of roll stands each having a roll gap;
opening the roll gap of one of the roll stands based on a physical characteristic of the transitional region, a position of the transitional region relative to the mill train and a linear speed of the rolling stock through the mill train, wherein a tension of the rolling stock in front of and behind one of the roll stand is equalized before opening the roll gap;
matching a rolling speed of a roll of at least one of the roll stands to the linear speed of the rolling stock through the mill train; and
closing the roll gap once the transitional region has traversed the roll stand.
31. The method as claimed in claim 30 , wherein a reduction in a roll gap is regulated with regard to the position of the transitional region relative to the mill train.
32. The method as claimed in claim 31 , wherein the tension of the rolling stock in front of the roll stand is regulated based on a rotating speed of drives of the remaining roll stands if the reduction in the roll stand has been reduced around a critical transitional region.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004022334A DE102004022334A1 (en) | 2004-05-06 | 2004-05-06 | Process for rolling a rolling stock with transition area |
DE102004022334.3 | 2004-05-06 | ||
PCT/EP2005/051943 WO2005107973A1 (en) | 2004-05-06 | 2005-04-28 | Method for rolling a product to be rolled comprising a transition region |
Publications (1)
Publication Number | Publication Date |
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US20080060403A1 true US20080060403A1 (en) | 2008-03-13 |
Family
ID=34967411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/579,356 Abandoned US20080060403A1 (en) | 2004-05-06 | 2005-04-28 | Method for Rolling Rolling Stock Having a Transitional Region |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080060403A1 (en) |
EP (1) | EP1747074A1 (en) |
CN (1) | CN1980753A (en) |
DE (1) | DE102004022334A1 (en) |
RU (1) | RU2006143047A (en) |
WO (1) | WO2005107973A1 (en) |
Cited By (5)
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US20090235707A1 (en) * | 2006-03-15 | 2009-09-24 | Birger Schmidt | Method For The Operation Of A Rolling Mill Used For Milling A Strip-Shaped Rolling Stock |
EP2135690A1 (en) | 2008-06-19 | 2009-12-23 | Siemens Aktiengesellschaft | Conti-mill train with integration/deintegration of roller frameworks in active operation |
US20120043043A1 (en) * | 2009-05-06 | 2012-02-23 | Matthias Kurz | Method for Producing Rolling Stock Rolled in a Rolling Train of a Rolling Mill, Control and/or Regulation Device for Rolling Mill for Producing Rolled Rolling Stock, Rolling Mill for Producing Rolled Rolling Stock, Machine Readable Program Code and Storage Medium |
US20120246917A1 (en) * | 2011-04-01 | 2012-10-04 | Ihi Corporation | Continuous press apparatus for electrode band plate |
US20230052057A1 (en) * | 2021-08-16 | 2023-02-16 | The Bradbury Co., Inc. | Methods and apparatus to control roll-forming processes |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101927267B (en) * | 2009-06-22 | 2012-07-04 | 宝山钢铁股份有限公司 | Control method and device for cleaning between rolls of finish rolling strip steel |
CN102431817A (en) | 2010-08-31 | 2012-05-02 | 海德堡印刷机械股份公司 | Transporting apparatus |
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- 2005-04-28 RU RU2006143047/02A patent/RU2006143047A/en not_active Application Discontinuation
- 2005-04-28 CN CNA2005800227989A patent/CN1980753A/en active Pending
- 2005-04-28 US US11/579,356 patent/US20080060403A1/en not_active Abandoned
- 2005-04-28 EP EP05742976A patent/EP1747074A1/en not_active Withdrawn
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Cited By (11)
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US20090235707A1 (en) * | 2006-03-15 | 2009-09-24 | Birger Schmidt | Method For The Operation Of A Rolling Mill Used For Milling A Strip-Shaped Rolling Stock |
US8291736B2 (en) * | 2006-03-15 | 2012-10-23 | Siemens Aktiengesellschaft | Method for the operation of a rolling mill used for milling a strip-shaped rolling stock |
EP2135690A1 (en) | 2008-06-19 | 2009-12-23 | Siemens Aktiengesellschaft | Conti-mill train with integration/deintegration of roller frameworks in active operation |
WO2009153126A1 (en) * | 2008-06-19 | 2009-12-23 | Siemens Aktiengesellschaft | Continuous rolling train with integration and/or removal of mill stands during ongoing operation |
US20110098842A1 (en) * | 2008-06-19 | 2011-04-28 | Hans-Joachim Felkl | Continuous rolling train with integration and/or removal of roll stands during ongoing operation |
US8731702B2 (en) | 2008-06-19 | 2014-05-20 | Siemens Aktiengesellschaft | Continuous rolling train with integration and/or removal of roll stands during ongoing operation |
US20120043043A1 (en) * | 2009-05-06 | 2012-02-23 | Matthias Kurz | Method for Producing Rolling Stock Rolled in a Rolling Train of a Rolling Mill, Control and/or Regulation Device for Rolling Mill for Producing Rolled Rolling Stock, Rolling Mill for Producing Rolled Rolling Stock, Machine Readable Program Code and Storage Medium |
US8459333B2 (en) * | 2009-05-06 | 2013-06-11 | Siemens Aktiengesellschaft | Method for producing rolling stock rolled in a rolling train of a rolling mill, control and/or regulation device for rolling mill for producing rolled rolling stock, rolling mill for producing rolled rolling stock, machine readable program code and storage medium |
US20120246917A1 (en) * | 2011-04-01 | 2012-10-04 | Ihi Corporation | Continuous press apparatus for electrode band plate |
US20230052057A1 (en) * | 2021-08-16 | 2023-02-16 | The Bradbury Co., Inc. | Methods and apparatus to control roll-forming processes |
US11919060B2 (en) * | 2021-08-16 | 2024-03-05 | The Bradbury Co., Inc. | Methods and apparatus to control roll-forming processes |
Also Published As
Publication number | Publication date |
---|---|
DE102004022334A1 (en) | 2005-12-01 |
WO2005107973A1 (en) | 2005-11-17 |
EP1747074A1 (en) | 2007-01-31 |
RU2006143047A (en) | 2008-06-20 |
CN1980753A (en) | 2007-06-13 |
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Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FELKL, HANS-JOACHIM;NIEMANN, MARTIN;REEL/FRAME:019688/0076 Effective date: 20061027 |
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Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |