EP1093865B1 - Method for reducing scrap material in the rolling of metal strips which are joined by weld seams and tandem train for implementing said method - Google Patents

Method for reducing scrap material in the rolling of metal strips which are joined by weld seams and tandem train for implementing said method Download PDF

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Publication number
EP1093865B1
EP1093865B1 EP00121628A EP00121628A EP1093865B1 EP 1093865 B1 EP1093865 B1 EP 1093865B1 EP 00121628 A EP00121628 A EP 00121628A EP 00121628 A EP00121628 A EP 00121628A EP 1093865 B1 EP1093865 B1 EP 1093865B1
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EP
European Patent Office
Prior art keywords
strip
rolling
roll
roll stand
stand
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Expired - Lifetime
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EP00121628A
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German (de)
French (fr)
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EP1093865A3 (en
EP1093865A2 (en
Inventor
Dipl.-Ing. Noé Rolf
Dipl.-Ing Dr. mont Andreas Noé
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BWG Bergwerk und Walzwerk Maschinenbau GmbH
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BWG Bergwerk und Walzwerk Maschinenbau GmbH
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Publication of EP1093865A3 publication Critical patent/EP1093865A3/en
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Classifications

    • 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
    • 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
    • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
    • B21B41/12—Arrangements of interest only with respect to provision for indicating or controlling operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/30—Arrangements for accumulating surplus web
    • B65H20/32—Arrangements for accumulating surplus web by making loops
    • B65H20/34—Arrangements for accumulating surplus web by making loops with rollers
    • 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
    • B21B2013/003—Inactive rolling stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/50—Diminishing, minimizing or reducing
    • B65H2601/51—Diminishing, minimizing or reducing entities relating to handled material
    • B65H2601/511—Waste of handled material

Definitions

  • the invention relates to a method for reducing the Scrap length when rolling welded seams Metal strips, especially when cold rolling austenitic and ferritic stainless steel strips.
  • tandem lines with two or more rolling stands known. With such tandem streets, either one in essentially straight, tight strip guidance between the rolling stands realized or a loop lifter provided, around a strip length compensation between the rolling stands to be able to generate.
  • tandem mills or rolling mills are becoming increasingly in-line in belt process lines used, e.g. B. in continuous rolling lines, continuous, pickling and Cold rolling lines or continuous, annealing, pickling and cold rolling lines for stainless steel strips, etc.
  • strip processing lines are run continuously through the metal strips to be treated. These metal strips are unwound from coils and connected by means of welds. The roll stands must be carried out regularly when going through the welds be opened.
  • the minimum scrap length corresponds twice the distance between the two rolling stands, because the one corresponding to this distance with respect to the weld length leading strip length also only in one Roll stand and consequently partially rolled is like that in with regard to the band length trailing the weld seam.
  • the rolls are changed every 1 - 10 coils.
  • the invention has for its object a method of Specify embodiment described above, after which there is scrap loss when welding seams pass through by significantly reducing the rolling stands that are open for this and accurate strip tension measurements between the roll stands as well as an exact presetting of the roll stands achieve in a simple and functional manner to let.
  • the invention teaches a method for achieving this object to reduce the scrap length when rolling medium Welded seams of connected metal strips, especially when Cold rolling of austenitic and ferritic stainless steel strips, in a continuous tandem street with at least two roll stands, after which the respective weld seam before the first roll stand stopped or crept is, while the second mill stand that in relation to the The metal strip leading the weld seam rolls on and that Metal strip to be rolled further from a between two roll stands arranged strip store receives the first roll stand opened and the weld seam through the first roll stand is driven through, then the first roll stand closed and the weld after passing through of the strip store stopped in front of the second roll stand or is creeping while the first rolling stand that trailing in relation to the weld seam Metal strip rolls and the rolled metal strip from the strip storage is recorded, the second roll stand is opened and the weld seam is passed through the second roll stand then the second mill stand is closed and so on, and the respective weld in the area of the tape outlet from the connecting them Metal strips
  • the Invention reduces the scrap length in the tandem mill and their rolling stands running and possibly continuous metal belts on practical the seam width of the connecting the metal strips Welds so that the scrap waste goes to zero, in any case extremely minimized.
  • the tandem rolling of the welded metal strips and stainless steel strips In-line in continuously working belt process lines respectively.
  • the invention further teaches that the belt tension in the lead-in area and the run-out area of the roll stands is measured, preferably also in the inlet area and outlet area of the Tape storage is measured.
  • the invention goes the invention from the knowledge that the metal strips between the rolling stands and through the arranged there Tape storage can be deflected by an angle of ⁇ 90 °. Thereby the influence of the bending stiffness of the metal strips the measurement that is too large at small wrap angles Measurement errors leads, negligibly small. It just has to the strip weight must also be taken into account in the measurement. This allows a sufficiently precise tape tension measurement realize between the rolling stands and a more stable Set the rolling process.
  • the belt pulls are expedient behind the first roll stand and in front of the second roll stand set.
  • the tape strength can be determined by measuring the pulling force required for a given degree of stretch in an upstream stretch bending straightening system and / or about measuring the for a given skin pass level required rolling force in an upstream Skin pass mill to be determined.
  • stretch bending straightening depends on the required pulling force for a given one Degree of stretching from the yield point and the flow curve, while the skin pass the required rolling force for a predetermined degree of skin passage from the yield point and depends on the flow curve. It is therefore possible from measurements the tape strength properties on upstream equipment of a coil before rolling to predetermine and via a rule model in the Let the setpoint flow into account. Through improved Target values can be avoided overrolling and strip breaks.
  • the measures according to the invention lead to a higher output during rolling and a higher Productivity of the entire system.
  • the invention also relates to a tandem mill especially to carry out the method according to the invention is suitable and at least two roll stands for rolling Metal strips, especially for cold rolling austenitic and has ferritic metal strips.
  • This tandem road is characterized in that between the two rolling stands a strip store for rolling metal strips arranged with alternately open roll stands is. It can be in front of and behind and, if necessary, between Roll stand strip tension measuring devices can be arranged. Such tape tension measuring devices can also be in front of and behind the tape storage. With these tape tension measuring devices it is preferably load cells under the bearings of pulleys and / or tensioners for the continuous metal bands and a band wrap of at least 45 °, preferably ⁇ 90 °. Actually let it load cells for measuring tape tension on rolls with a Use belt wrapping up to 180 ° or more. Thereby are measurement errors as they are with rolls with small Wrap angles can occur almost completely, can are neglected in any case.
  • the tandem road has two Roll stands 4, 5. Between the two roll stands 4, 5 is a strip storage 6 for rolling the continuous Metal strips 7 with alternately open roll stands 4, 5 shown.
  • Belt tension measuring devices 8, 9 arranged, namely on the one hand in the area of the inlet clamping set 2, on the other hand in Area of the outlet clamping set 3. Beyond that too 6 tape tension measuring devices in front and behind the tape storage device 10, 11 arranged.
  • the belt store 6 has a deflecting roller that can be raised and lowered 12 for the incoming and outgoing metal strip 7, the can be driven.
  • 2 is the two metal strips 7a, 7b connecting Welded seam 13 and in front of the first roll stand 4 stopped there while the second mill stand 5 continues rolling and the metal strip 7b to be rolled the intermediate Tape storage 6 in the sense of a tape storage emptying extracts.
  • 3 is the first roll stand 4th opened, a roll change may have taken place, the weld seam 13 has passed the first roll stand 4 and the first roll stand 4 has been closed again, while the second roll stand 5 has continuously rolled on. 4, the weld 13 is in front of the second roll stand 5 driven and stopped there while the first closed roll stand 4 that of the weld 13 subsequent metal strip 7a rolls and the strip storage 6 is loaded with rolled metal strip 7a.
  • the second roll stand 5 has been opened, the weld seam 13 has been passed through, may have a Roll change took place and the roll stand 5 is again closed while the first mill stand 4 has continuously rolled on and the strip storage 6 has been filled again with rolled metal strip 7a.
  • the cutting out or cutting out of the weld seam 13 can be done in the area of the tape outlet such that the scrap length to the width of the weld 13 is reduced.

Abstract

The metal band is cold rolled in a tandem rolling mill with two or more roll stands (4,5). The weld seam is stopped in front of the first stand, the second stand continuous to roll the strip (7) in front of the seam, which is supplied from a store (6) between the stands. The first stand is opened, the seam is passed through, the stand is closed, the seam passes through The store, and is stopped in front of the second stand, while the first stand rolls the strip behind the seam and the rolled strip is taken-up by the store. The second stand is opened, the seam is passed through, the second stand is closed, and the seam is cut out of the strip.

Description

Die Erfindung betrifft ein Verfahren zum Reduzieren der Schrottlänge beim Walzen von mittels Schweißnähten verbundener Metallbänder, insbesondere beim Kaltwalzen von austenitischen und ferritischen Edelstahlbändern.The invention relates to a method for reducing the Scrap length when rolling welded seams Metal strips, especially when cold rolling austenitic and ferritic stainless steel strips.

Es sind Tandemstraßen mit zwei oder mehreren Walzgerüsten bekannt. Bei derartigen Tandemstraßen ist entweder eine im wesentlichen gerade, stramme Bandführung zwischen den Walzgerüsten verwirklicht oder ein Schlingenheber vorgesehen, um einen Bandlängenausgleich zwischen den Walzgerüsten erzeugen zu können. Derartige Tandemstraßen bzw. -walzwerke werden in zunehmendem Maße auch In-line in Bandprozeßlinien eingesetzt, z. B. in Kontiwalzlinien, Konti-, Beiz- und Kaltwalzlinien oder Konti-, Glüh-, Beiz- und Kaltwalzlinien für Edelstahlbänder usw. Derartige Bandprozeßlinien werden von den zu behandelnden Metallbändern kontinuierlich durchlaufen. Diese Metallbänder werden von Coils abgewickelt und mittels Schweißnähten miteinander verbunden. Die Walzgerüste müssen beim Durchlaufen der Schweißnähte regelmäßig geöffnet werden. Das gilt insbesondere für austenitische und ferritische Metallbänder, aber auch unter Berücksichtigung der Dickenunterschiede zwischen den miteinander verschweißten Metallbändern. Durch das Öffnen der Walzgerüste werden Bandabschnitte vorgegebener Länge vor und hinter der jeweiligen Schweißnaht nicht oder nur teilweise gewalzt und müssen daher als Schrott im Auslauf der Bandprozeßlinien herausgetrennt, regelmäßig herausgeschnitten werden. Die daraus resultierende Schrottlänge beträgt im Falle einer Tandemstraße mit zwei Walzgerüsten ca. 20 m pro Coil bzw. Metallband. Das entspricht in etwa dem zweifachen Abstand zwischen zwei Walzgerüsten. Denn bei herkömmlichen Tandemstraßen wird die jeweilige Schweißnaht bis vor das erste Walzgerüst gefahren. Das Metallband wird gestoppt. Die Walzgerüste werden geöffnet. Bei geöffneten Walzgerüsten findet im allgemeinen ein Walzenwechsel statt. Die Schweißnaht wird während des Walzenwechsels bis hinter das zweite Walzgerüst gefahren. Danach und folglich nach dem Walzenwechsel werden beide Walzgerüste wieder geschlossen, so daß das Walzen des nächsten Coils bzw. Metallbandes beginnen kann. Folglich entspricht die minimale Schrottlänge dem zweifachen Abstand zwischen den beiden Walzgerüsten, weil die diesem Abstand entsprechende in bezug auf die Schweißnaht vorlaufende Bandlänge ebenso nur in einem Walzgerüst und folglich teilweise gewalzt ist wie die in bezug auf die Schweißnaht nachlaufende Bandlänge. Produktabhängig werden die Walzen alle 1 - 10 Coils gewechselt.They are tandem lines with two or more rolling stands known. With such tandem streets, either one in essentially straight, tight strip guidance between the rolling stands realized or a loop lifter provided, around a strip length compensation between the rolling stands to be able to generate. Such tandem mills or rolling mills are becoming increasingly in-line in belt process lines used, e.g. B. in continuous rolling lines, continuous, pickling and Cold rolling lines or continuous, annealing, pickling and cold rolling lines for stainless steel strips, etc. Such strip processing lines are run continuously through the metal strips to be treated. These metal strips are unwound from coils and connected by means of welds. The roll stands must be carried out regularly when going through the welds be opened. This is especially true for austenitic and ferritic metal strips, but also taking into account the difference in thickness between them welded metal bands. By opening the roll stands are band sections of a given length before and not or only partially behind the respective weld rolled and therefore have to be scrap in the outlet of the strip process lines cut out, cut out regularly become. The resulting scrap length is in Case of a tandem mill with two roll stands approx. 20 m each Coil or metal band. That is roughly twice as much Distance between two roll stands. Because with conventional The respective weld seam will be tandem streets until before first roll stand driven. The metal band is stopped. The roll stands are opened. With the rolling stands open there is generally a roll change. The The weld seam is behind this during the roll change second mill stand. After and consequently after Both roll stands are closed again when the rolls are changed, so that the rolling of the next coil or metal strip can start. As a result, the minimum scrap length corresponds twice the distance between the two rolling stands, because the one corresponding to this distance with respect to the weld length leading strip length also only in one Roll stand and consequently partially rolled is like that in with regard to the band length trailing the weld seam. Depending on the product the rolls are changed every 1 - 10 coils.

Hinz kommt, daß beim Kaltwalzen von Edelstählen bestimmte Zugverhältnisse hinsichtlich Einlaufzug und Auslaufzug an einem Walzgerüst eingehalten werden müssen, um ein Bandschlupfen im Walzgerüst und eine damit verbundene Instabilität zu vermeiden, die zu einen Bandriß führen kann. Ein Bandriß würde zu erheblichen Produktionsausfallund Schrottkosten führen. Für die Bandzugmessung werden im allgemeinen Bandzugmeßrollen derart eingesetzt, daß das Metallband die Bandzugmeßrollen lediglich mit einem Winkel von 5° - 15° umschlingt. Kraftmeßdosen messen die horizontale und/oder vertikale Kraftkomponente, welche das Metallband auf die Bandzugmeßrollen ausübt. Der Bandzug wird unter der Annahme ermittelt, daß das betreffende Metallband im wesentlichen biegeschlaff ist. Bei Metallbändern mit größerer Banddicke ist die Annahme der Biegeschlaffheit jedoch nicht mehr gerechtfertigt. Vielmehr verhalten sich Metallbänder mit wachsender Banddicke schließlich wie ein Biegebalken. Folglich wird selbst bei einem Bandzug Null eine Kraft auf die Bandzugmeßrollen ausgeübt. Dadurch wird die Bandzugmessung negativ beeinflußt. Hinzu kommt eine sich durch das Eigengewicht des jeweiligen Metallbandes überlagernde Kraft, so daß bei dem vorerwähnten Umschlingungswinkel erhebliche Meßfehler in Abhängigkeit von den jeweiligen Banddicken auftreten können. Da im übrigen der Einfluß unterschiedlicher Bandfestigkeiten, insbesondere der Einfluß sich durch das Walzen ändernder Bandfestigkeiten, unberücksichtigt bleibt, können fehlerhafte Bandzugmessungen schließlich zu einem Bandriß führen. Ein weiteres Problem, welches beim Kaltwalzen von Edelstahlbändern und insbesondere Edel-Warmbändern auftritt, sind die bei gleichem Produkt von Coil zu Coil oft stark schwankenden Werte der Banddicke, des Bandesprofils und der Bandfestigkeit am Anfang eines Coils. Die Walzgerüste müssen vor Walzbeginn hinreichend gut voreingestellt werden. Das gilt in bezug auf die Walzkraft ebenso wie hinsichtlich der Einstellung von Planheitsstellgliedern, um ein Planwalzen zu gewährleisten. Auch bei mangelhafter Gerüstvoreinstellung kann es daher zu Überwalzungen und folglich Bandrissen kommen.Added to this is the fact that when cold rolling stainless steels certain Draft conditions with regard to the incoming and outgoing trains a rolling stand must be adhered to in order to Belt slippage in the roll stand and a related one Avoid instability that lead to a ligament rupture can. A tape break would lead to considerable loss of production and Lead scrap costs. For the tape tension measurement in general tape tension measuring rollers used such that the Metal tape the tape tension measuring rollers only at an angle from 5 ° to 15 °. Load cells measure the horizontal and / or vertical force component which the metal band exerts on the tape tension measuring rollers. The belt pull will determined on the assumption that the metal strip in question is essentially limp. With metal strips with greater strip thickness is the assumption of bending slack however no longer justified. Rather behave Finally, metal strips with increasing strip thickness like one Bending beam. As a result, even with a tape draw, it becomes zero exerted a force on the tape tension measuring rollers. This will the tape tension measurement negatively affected. There is also one by the weight of the respective metal band superimposing force, so that at the aforementioned wrap angle considerable measurement errors depending on the respective strip thickness can occur. As for the rest the influence of different band strengths, in particular the influence of changing strip strengths, disregarded may be incorrect Tape tension measurements eventually lead to a tape tear. On Another problem that occurs when cold rolling stainless steel strips and in particular precious hot strips occurs often strong for the same product from coil to coil fluctuating values of the strip thickness, the strip profile and the Strip strength at the beginning of a coil. The roll stands must be set sufficiently well before the start of rolling become. This applies to the rolling force as well as to the adjustment of flatness actuators to to ensure face rolling. Even with poor ones Scaffolding presetting can therefore lead to rolling and consequently, tears come.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Ausführungsform anzugeben, wonach sich Schrottverluste beim Durchlaufen von Schweißnähten durch dafür geöffnete Walzgerüste hierdurch erheblich reduzieren und genaue Bandzugmessungen zwischen den Walzgerüsten ebenso wie eine genaue Voreinstellung der Walzgerüste in einfacher und funktionsgerechter Weise erreichen lassen.The invention has for its object a method of Specify embodiment described above, after which there is scrap loss when welding seams pass through by significantly reducing the rolling stands that are open for this and accurate strip tension measurements between the roll stands as well as an exact presetting of the roll stands achieve in a simple and functional manner to let.

Zur Lösung dieser Aufgabe lehrt die Erfindung ein Verfahren zum Reduzieren der Schrottlänge beim Walzen von mittels Schweißnähten verbundener Metallbändern, insbesondere beim Kaltwalzen von austenitischen und ferritischen Edelstahlbändern, in einer durchlaufenen Tandemstraße mit zumindest zwei Walzgerüsten, wonach die jeweilige Schweißnaht vor dem ersten Walzgerüst angehalten oder im Schleichgang gefahren wird, während das zweite Walzgerüst das in bezug auf die Schweißnaht vorlaufende Metallband weiterwalzt und das weiterzuwalzende Metallband aus einem zwischen beiden Walzgerüsten angeordneten Bandspeicher erhält, das erste Walzgerüst geöffnet und die Schweißnaht durch das erste Walzgerüst hindurchgefahren wird, anschließend das erste Walzgerüst geschlossen und die Schweißnaht nach dem Durchlaufen des Bandspeichers vor dem zweiten Walzgerüst angehalten oder im Schleichgang gefahren wird, während das erste Walzgerüst das in bezug auf die Schweißnaht nachlaufende Metallband walzt und das gewalzte Metallband von dem Bandspeicher aufgenommen wird, das zweite Walzgerüst geöffnet und die Schweißnaht durch das zweite Walzgerüst hindurchgefahren wird, anschließend das zweite Walzgerüst geschlossen wird und so fort, und die jeweilige Schweißnaht im Bereich des Bandauslaufs aus den sie verbindenden Metallbändern herausgetrennt wird. - Im Rahmen der Erfindung finden Metallbänder und insbesondere Edelstahlbänder mit Eingangsdicken bis zu 10 mm Verwendung, wobei das erfindungsgemäße Verfahren auch bei Tandemstraßen mit mehr als zwei Walzgerüsten funktioniert, wenn zwischen jeweils zwei oder zumindest zwei Walzgerüsten ein Bandspeicher angeordnet ist. Dabei kann im Zuge des Öffnens der Walzgerüste wahlweise ein Walzenwechsel vorgenommen werden, weil der Bandspeicher so dimensioniert ist, daß er einerseits praktisch geleert werden kann, während das erste Walzgerüst geöffnet ist und das zweite Walzgerüst das der Schweißnaht voreilende Metallband weiterwalzt und anschließend wieder vollständig gefüllt werden kann, während das zweite Walzgerüst geöffnet ist und das erste Walzgerüst das der Schweißnaht nacheilende Metallband walzt und an den Bandspeicher abgibt. Durch diese Maßnahmen der Erfindung reduziert sich die Schrottlänge bei die Tandemstraße und ihre Walzgerüste durchlaufenden und ggf. kontinuierlich durchlaufenden Metallbändern auf praktisch die Nahtbreite der die Metallbänder verbindenden Schweißnähte, so daß der Schrottabfall gegen Null geht, jedenfalls extrem minimiert wird. Darüber hinaus kann im Rahmen der Erfindung das Tandemwalzen der schweißnahtverbundenen Metallbänder und Edelstahlbänder In-line in kontinuierlich arbeitenden Bandprozeßlinien erfolgen.The invention teaches a method for achieving this object to reduce the scrap length when rolling medium Welded seams of connected metal strips, especially when Cold rolling of austenitic and ferritic stainless steel strips, in a continuous tandem street with at least two roll stands, after which the respective weld seam before the first roll stand stopped or crept is, while the second mill stand that in relation to the The metal strip leading the weld seam rolls on and that Metal strip to be rolled further from a between two roll stands arranged strip store receives the first roll stand opened and the weld seam through the first roll stand is driven through, then the first roll stand closed and the weld after passing through of the strip store stopped in front of the second roll stand or is creeping while the first rolling stand that trailing in relation to the weld seam Metal strip rolls and the rolled metal strip from the strip storage is recorded, the second roll stand is opened and the weld seam is passed through the second roll stand then the second mill stand is closed and so on, and the respective weld in the area of the tape outlet from the connecting them Metal strips is separated. - As part of the Metal strips and in particular stainless steel strips find invention with input thicknesses up to 10 mm use, whereby the inventive method with tandem streets more than two roll stands will work if between Two or at least two roll stands a strip storage is arranged. In the course of opening the Roll stands can optionally be changed, because the tape storage is dimensioned so that it is on the one hand can be practically emptied during the first Roll stand is open and the second stand is the The metal strip leading the weld seam rolls on and can then be filled completely again, while the second mill stand is open and the first Rolling mill rolls the metal strip lagging the weld seam and delivers to the tape storage. Through these measures the Invention reduces the scrap length in the tandem mill and their rolling stands running and possibly continuous metal belts on practical the seam width of the connecting the metal strips Welds so that the scrap waste goes to zero, in any case extremely minimized. In addition, in Within the scope of the invention the tandem rolling of the welded metal strips and stainless steel strips In-line in continuously working belt process lines respectively.

Ferner lehrt die Erfindung, daß der Bandzug im Einlaufbereich und Auslaufbereich der Walzgerüste gemessen wird, vorzugsweise auch im Einlaufbereich und Auslaufbereich des Bandspeichers gemessen wird. In diesem Zusammenhang geht die Erfindung von der Erkenntnis aus, daß die Metallbänder zwischen den Walzgerüsten und durch den dort angeordneten Bandspeicher um Winkel von ≥ 90° umgelenkt werden. Dadurch wird der Einfluß der Biegesteifigkeit der Metallbänder auf die Messung, die bei kleinen Umschlingungswinkeln zu großen Meßfehlern führt, vernachlässigbar klein. Es muß lediglich noch das Bandgewicht in der Messung berücksichtigt werden. Somit läßt sich eine hinreichend genaue Bandzugmessung zwischen den Walzgerüsten verwirklichen und ein stabiler Walzprozeß einstellen. Zweckmäßigerweise werden die Bandzüge hinter dem ersten Walzgerüst und vor dem zweiten Walzgerüst eingestellt. Denn in einigen Fällen ist es walztechnisch sinnvoll, wenn der Bandzug hinter dem ersten Walzgerüst nicht gleich dem Bandzug vor dem zweiten Walzgerüst ist. Unterschiedliche Bandzüge können sich positiv auf die Stabilität des Walzprozesses und auf eine maximal mögliche Stichabnahme auswirken. Weiter lehrt die Erfindung, daß vor dem Walzen am Bandanfang zumindest die Banddicke und die Bandfestigkeit gemessen und zur Voreinstellung der Walzgerüste hinsichtlich der Walzkraft und des Planwalzens verwendet werden. Die Messung kann direkt oder indirekt erfolgen und in die Sollwertbildung eines Regelkreises einfließen. Beispielsweise kann die Bandfestigkeit über Kraftmessungen bei den Walzen vorgeschalteten Scher- und/oder Besäumvorgängen ermittelt werden. Tatsächlich bestehen eindeutige Beziehungen zwischen der Scherkraft, Scherfestigkeit sowie der Zugfestigkeit beim beispielsweise Querteilschneiden und/oder Besäumen der Metallbänder. Die Bandfestigkeit kann über die Messung der für einen vorgegebenen Streckgrad erforderlichen Zugkraft in einer vorgeschalteten Streckbiegerichtanlage und/oder über die Messung der für einen vorgegebenen Dressiergrad erforderlichen Walzkraft in einem vorgeschalteten Dressiergerüst ermittelt werden. Beim Streckbiegerichten hängt die erforderliche Zugkraft für einen vorgegebenen Sreckgrad von der Streckgrenze und der Fließkurve ab, während beim Dressieren die erforderliche Walzkraft für einen vorgegebenen Dressiergrad von der Streckgrenze und der Fließkurve abhängt. Es ist daher möglich, aus Messungen an vorgeschalteten Einrichtungen die Bandfestigkeitseigenschaften eines Coils vor dem Walzen vorherzubestimmen und über ein Regelmodell in die Sollwertbildung einfließen zu lassen. Durch verbesserte Sollwerte lassen sich Überwalzungen und Bandrisse vermeiden.The invention further teaches that the belt tension in the lead-in area and the run-out area of the roll stands is measured, preferably also in the inlet area and outlet area of the Tape storage is measured. In this context goes the invention from the knowledge that the metal strips between the rolling stands and through the arranged there Tape storage can be deflected by an angle of ≥ 90 °. Thereby the influence of the bending stiffness of the metal strips the measurement that is too large at small wrap angles Measurement errors leads, negligibly small. It just has to the strip weight must also be taken into account in the measurement. This allows a sufficiently precise tape tension measurement realize between the rolling stands and a more stable Set the rolling process. The belt pulls are expedient behind the first roll stand and in front of the second roll stand set. Because in some cases it is rolling technology makes sense if the belt tension behind the first Roll stand not the same as the strip tension in front of the second roll stand is. Different belt pulls can be positive on the stability of the rolling process and on a maximum possible stitch acceptance impact. The teaches on Invention that before rolling at least the beginning of the strip Strip thickness and strip strength measured and for presetting of the rolling stands in terms of rolling force and Face rolling can be used. The measurement can be made directly or indirectly and in the setpoint formation of a control loop incorporated. For example, the tape strength upstream of force measurements on the rollers Shear and / or trimming processes can be determined. In fact, there are clear relationships between the Shear force, shear strength and tensile strength at for example cross cutting and / or trimming the Metal bands. The tape strength can be determined by measuring the pulling force required for a given degree of stretch in an upstream stretch bending straightening system and / or about measuring the for a given skin pass level required rolling force in an upstream Skin pass mill to be determined. When stretch bending straightening depends on the required pulling force for a given one Degree of stretching from the yield point and the flow curve, while the skin pass the required rolling force for a predetermined degree of skin passage from the yield point and depends on the flow curve. It is therefore possible from measurements the tape strength properties on upstream equipment of a coil before rolling to predetermine and via a rule model in the Let the setpoint flow into account. Through improved Target values can be avoided overrolling and strip breaks.

Im Ergebnis führen die erfindungsgemäßen Maßnahmen zu einer höheren Ausbringung beim Walzen und einer höheren Produktivität der Gesamtanlage.As a result, the measures according to the invention lead to a higher output during rolling and a higher Productivity of the entire system.

Gegenstand der Erfindung ist ferner eine Tandemstraße die zur Durchführung des erfindungsgemäßen Verfahrens besonders geeignet ist und zumindest zwei Walzgerüste zum Walzen von Metallbändern, insbesondere zum Kaltwalzen austenitischer und ferritischer Metallbänder aufweist. Diese Tandemstraße ist dadurch gekennzeichnet, daß zwischen den beiden Walzgerüsten ein Bandspeicher zum Walzen durchlaufender Metallbänder bei wechselweise geöffneten Walzgerüsten angeordnet ist. Dabei können vor und hinter und ggf. zwischen den Walzgerüsten Bandzugmeßvorrichtungen angeordnet sein. Solche Bandzugmeßvorrichtungen können sich auch vor und hinter dem Bandspeicher befinden. Bei diesen Bandzugmeßvorrichtungen handelt es sich vorzugsweise um Kraftmeßdosen unter den Lagern von Umlenkrollen und/oder Spannrollen für die durchlaufenden Metallbänder und einer Bandumschlingung von mindestens 45°, vorzugsweise ≥ 90°. Tatsächlich lassen sich Kraftmeßdosen zur Bandzugmessung an Rollen mit einer Bandumschlingung bis zu 180° oder mehr einsetzen. Dadurch werden Meßfehler wie sie bei Rollen mit kleinen Umschlingungswinkeln auftreten nahezu ausgeschaltet, können jedenfalls vernachlässigt werden.The invention also relates to a tandem mill especially to carry out the method according to the invention is suitable and at least two roll stands for rolling Metal strips, especially for cold rolling austenitic and has ferritic metal strips. This tandem road is characterized in that between the two rolling stands a strip store for rolling metal strips arranged with alternately open roll stands is. It can be in front of and behind and, if necessary, between Roll stand strip tension measuring devices can be arranged. Such tape tension measuring devices can also be in front of and behind the tape storage. With these tape tension measuring devices it is preferably load cells under the bearings of pulleys and / or tensioners for the continuous metal bands and a band wrap of at least 45 °, preferably ≥ 90 °. Actually let it load cells for measuring tape tension on rolls with a Use belt wrapping up to 180 ° or more. Thereby are measurement errors as they are with rolls with small Wrap angles can occur almost completely, can are neglected in any case.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen:

Fig. 1
eine erfindungsgemäße Tandemstraße in schematischer Seitenansicht und
Fig.2-5
einen Schweißnahtdurchlauf durch den Gegenstand nach Fig. 1, wobei die Walzgerüste wechselweise geöffnet werden, um einerseits einen kontinuierlichen Banddurchlauf, andererseits einen Walzenwechsel bei geöffneten Walzgerüsten zu ermöglichen.
The invention is explained in more detail below with reference to a drawing which represents only one exemplary embodiment. Show it:
Fig. 1
a tandem mill according to the invention in a schematic side view and
Fig.2-5
1, the weld passes through the object according to FIG. 1, the roll stands being opened alternately, on the one hand to enable a continuous strip pass, and on the other hand to enable a roll change when the roll stands are open.

In den Fig. 1 bis 5 ist eine Bandprozeßlinie 1 für kontinuierlich durchlaufende Metallbänder dargestellt, bei welcher eine Tandemstraße In-line eingesetzt ist. Von der Bandprozeßlinie 1 sind lediglich ein Einlaufspannsatz 2 und ein Auslaufspannsatz 3 gezeigt. Die Tandemstraße weist zwei Walzgerüste 4, 5 auf. Zwischen den beiden Walzgerüsten 4, 5 ist ein Bandspeicher 6 zum Walzen der durchlaufenden Metallbänder 7 bei wechselweise geöffneten Walzgerüsten 4, 5 dargestellt. Vor und hinter den Walzgerüsten 4, 5 sind Bandzugmeßvorrichtungen 8, 9 angeordnet, nämlich einerseits im Bereich des Einlauf spannsatzes 2, andererseits im Bereich des Auslaufspannsatzes 3. Darüber hinaus sind auch vor und hinter dem Bandspeicher 6 Bandzugmeßvorrichtungen 10, 11 angeordnet.1 to 5 is a belt process line 1 for continuous metal strips shown at which is a tandem mill used in-line. Of the Belt process line 1 are only an inlet clamping set 2 and an outlet clamping set 3 is shown. The tandem road has two Roll stands 4, 5. Between the two roll stands 4, 5 is a strip storage 6 for rolling the continuous Metal strips 7 with alternately open roll stands 4, 5 shown. In front and behind the roll stands 4, 5 are Belt tension measuring devices 8, 9 arranged, namely on the one hand in the area of the inlet clamping set 2, on the other hand in Area of the outlet clamping set 3. Beyond that too 6 tape tension measuring devices in front and behind the tape storage device 10, 11 arranged.

Der Bandspeicher 6 weist eine heb- und senkbare Umlenkrolle 12 für das ein- und auslaufende Metallband 7 auf, die angetrieben sein kann.The belt store 6 has a deflecting roller that can be raised and lowered 12 for the incoming and outgoing metal strip 7, the can be driven.

Nach Fig. 2 ist die zwei Metallbänder 7a, 7b verbindende Schweißnaht 13 bis vor das erste Walzgerüst 4 gefahren und dort angehalten worden, während das zweite Walzgerüst 5 weiterwalzt und das zu walzende Metallband 7b dem zwischengeschalteten Bandspeicher 6 im Sinne einer Bandspeicherentleerung entnimmt. Nach Fig. 3 ist das erste Walzgerüst 4 geöffnet worden, hat ggf. ein Walzenwechsel stattgefunden, hat die Schweißnaht 13 das erste Walzgerüst 4 passiert und ist das erste Walzgerüst 4 wieder geschlossen worden, während das zweite Walzgerüst 5 ständig weitergewalzt hat. Nach Fig. 4 ist die Schweißnaht 13 bis vor das zweite Walzgerüst 5 gefahren und dort angehalten worden, während das erste wieder geschlossene Walzgerüst 4 das der Schweißnaht 13 nachfolgende Metallband 7a walzt und der Bandspeicher 6 mit gewalztem Metallband 7a beschickt wird.2 is the two metal strips 7a, 7b connecting Welded seam 13 and in front of the first roll stand 4 stopped there while the second mill stand 5 continues rolling and the metal strip 7b to be rolled the intermediate Tape storage 6 in the sense of a tape storage emptying extracts. 3 is the first roll stand 4th opened, a roll change may have taken place, the weld seam 13 has passed the first roll stand 4 and the first roll stand 4 has been closed again, while the second roll stand 5 has continuously rolled on. 4, the weld 13 is in front of the second roll stand 5 driven and stopped there while the first closed roll stand 4 that of the weld 13 subsequent metal strip 7a rolls and the strip storage 6 is loaded with rolled metal strip 7a.

Nach Fig. 5 ist das zweite Walzgerüst 5 geöffnet worden, die Schweißnaht 13 hindurchgefahren worden, hat ggf. ein Walzenwechsel stattgefunden und ist das Walzgerüst 5 wieder geschlossen worden, während das erste Walzgerüst 4 kontinuierlich weitergewalzt hat und der Bandspeicher 6 wieder mit gewalztem Metallband 7a gefüllt worden ist. - 5, the second roll stand 5 has been opened, the weld seam 13 has been passed through, may have a Roll change took place and the roll stand 5 is again closed while the first mill stand 4 has continuously rolled on and the strip storage 6 has been filled again with rolled metal strip 7a. -

Das Heraustrennen bzw. das Ausschneiden der Schweißnaht 13 kann im Bereich des Bandauslaufes erfolgen, und zwar derart, daß die Schrottlänge auf die Breite der Schweißnaht 13 reduziert wird.The cutting out or cutting out of the weld seam 13 can be done in the area of the tape outlet such that the scrap length to the width of the weld 13 is reduced.

Claims (13)

  1. A method of reducing the scrap length during the rolling of metal strip (7) which is joined by means of weld seams (13), particularly during the cold rolling of austenitic and ferritic stainless steel strip, in a continuous tandem line comprising at least two roll stands (4, 5), according to which
    the respective weld seam (13) is stopped or is moved at creep speed upstream of the first roll stand (4), whilst the second roll stand (5) continues to roll the metal strip (7b) travelling ahead of the weld seam (13), and obtains the metal strip (7) which it continues to roll from a strip accumulator (6) disposed between the two roll stands (4, 5),
    the first roll stand (4) is opened and the weld seam (13) is passed through the first roll stand (4),
    the first roll stand (4) is subsequently closed and after passing through the strip accumulator (6) the weld seam (13) is stopped or is moved at creep speed upstream of the second roll stand (5), whilst the first roll stand (4) rolls the metal strip (7a) travelling behind the weld seam (13) and the rolled metal strip (7) is taken up by the strip accumulator (6),
    the second roll stand (5) is opened and the weld seam (13) is passed through the second roll stand (5),
    the second roll stand (5) is subsequently closed, and so on, and
    in the region of the strip output, the respective weld seam (13) is separated from the metal strips (7) which it joins.
  2. A method according to claim 1, characterised in that a change of rolls is optionally made in the course of opening the roll stands (4, 5).
  3. A method according to claim 1 or 2, characterised in that tandem rolling of the metal strips (7) joined by the weld seam (13) is effected in-line in strip processing lines (1).
  4. A method according to any one of claims 1 to 3, characterised in that the strip tension is measured in the input region and the output region of the roll stands (4, 5).
  5. A method according to any one claims 1 to 4, characterised in that the strip tension is measured in the input region and the output region of the strip accumulator (6).
  6. A method according to any one of claims 1 to 5, characterised in that the strip tensions are adjusted downstream of the first roll stand (4) and upstream of the second roll stand (5).
  7. A method according to any one of claims 1 to 6, characterised in that at least the strip thickness and strip strength are measured at the strip start before rolling and are used for presetting the roll stands (4, 5) as regards rolling force and flat rolling.
  8. A method according to any one of claims 1 to 7, characterised in that the strip strength is determined via force measurements during shearing and/or trimming operations upstream of rolling.
  9. A method according to any one of claims 1 to 8, characterised in that the strip strength is determined via the measurement of the tensile force which is necessary for a given degree of stretching in an upstream stretcher-and-roller levelling installation and/or via the measurement of the rolling force which is necessary for a given degree of conditioning in an upstream conditioning roll stand.
  10. A tandem line for carrying out the method according to any one of claims 1 to 9, comprising at least two roll stands (4, 5) for rolling metal strip (7), particularly for the cold rolling of austenitic and ferritic metal strip (7), characterised in that a strip accumulator (6) is disposed between the two roll stands (4, 5) for rolling continuous metal strip (7) when the roll stands (4, 5) are opened alternately.
  11. A tandem line according to claim 10, characterised in that strip tension measuring apparatuses (8, 9) are disposed upstream and downstream of and optionally between the roll stands (4, 5).
  12. A tandem line according to claim 10 or 11, characterised in that strip tension measuring apparatuses (10, 11) are disposed upstream and downstream of the strip accumulator (6).
  13. A tandem line according to any one of claims 10 to 12, characterised in that the strip tension measuring apparatuses (8 - 11), e.g. load cells, are disposed below the bearings of deflection rolls and/or tension rolls having a degree of strip looping of at least 45°, preferably ≥ 90°, for the continuous metal strip (7).
EP00121628A 1999-10-21 2000-10-04 Method for reducing scrap material in the rolling of metal strips which are joined by weld seams and tandem train for implementing said method Expired - Lifetime EP1093865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19950609A DE19950609C2 (en) 1999-10-21 1999-10-21 Process for reducing the scrap length when rolling metal strips connected by means of weld seams and tandem mill for carrying out the process
DE19950609 1999-10-21

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EP1093865A2 EP1093865A2 (en) 2001-04-25
EP1093865A3 EP1093865A3 (en) 2001-05-02
EP1093865B1 true EP1093865B1 (en) 2003-08-20

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US (1) US6357273B1 (en)
EP (1) EP1093865B1 (en)
AT (1) ATE247534T1 (en)
DE (2) DE19950609C2 (en)
ES (1) ES2200769T3 (en)
ZA (1) ZA200005828B (en)

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JP4150276B2 (en) * 2003-03-20 2008-09-17 新日本製鐵株式会社 Rolling method and rolling apparatus for metal sheet
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US8607667B2 (en) * 2005-10-26 2013-12-17 The Gillette Company Manufacturing razor blades
US7578217B2 (en) * 2005-10-26 2009-08-25 The Gillette Company Manufacturing razor blades
DE102015116990A1 (en) * 2015-10-06 2017-04-06 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method and plant for the continuous production of composite strips or sheets
CN105215063A (en) * 2015-10-24 2016-01-06 本钢不锈钢冷轧丹东有限责任公司 A kind of vertical entry loop
DE102018122047A1 (en) 2018-09-10 2020-03-12 voestalpine Automotive Components Dettingen GmbH & Co. KG METHOD AND DEVICE FOR CONNECTING SHEET PARTS TO SHEET PACKAGES
DE102019110271A1 (en) * 2019-04-18 2020-01-02 Primetals Technologies Austria GmbH Cold rolling mill with alternative feeding of a steel strip in two different ways
JP7135991B2 (en) * 2019-04-25 2022-09-13 トヨタ自動車株式会社 Calibration judgment device and calibration judgment method
CN114054512A (en) * 2020-08-03 2022-02-18 上海梅山钢铁股份有限公司 Pickling plate thickness data home-entry method
CN112453053B (en) * 2020-09-28 2023-07-11 甘肃酒钢集团宏兴钢铁股份有限公司 Strip steel lifting eliminating method for finishing machine in production of thin-specification and extremely-thin-specification strip steel
CN114789199B (en) * 2021-10-14 2024-01-12 天津市新宇彩板有限公司 Automatic accurate control method and system for front pinch roll of cold rolling shears

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DE19950609C2 (en) 2001-10-18
US6357273B1 (en) 2002-03-19
EP1093865A3 (en) 2001-05-02
DE19950609A1 (en) 2001-05-03
ATE247534T1 (en) 2003-09-15
ZA200005828B (en) 2001-05-17
EP1093865A2 (en) 2001-04-25
ES2200769T3 (en) 2004-03-16
DE50003345D1 (en) 2003-09-25

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