EP0988904B1 - Method and device for measuring the flatness of strips - Google Patents

Method and device for measuring the flatness of strips Download PDF

Info

Publication number
EP0988904B1
EP0988904B1 EP99116003A EP99116003A EP0988904B1 EP 0988904 B1 EP0988904 B1 EP 0988904B1 EP 99116003 A EP99116003 A EP 99116003A EP 99116003 A EP99116003 A EP 99116003A EP 0988904 B1 EP0988904 B1 EP 0988904B1
Authority
EP
European Patent Office
Prior art keywords
strip
measuring
braking force
measuring region
flatness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99116003A
Other languages
German (de)
French (fr)
Other versions
EP0988904A3 (en
EP0988904A2 (en
Inventor
Rolf Dipl.-Ing. Noé
Andreas Dr. mont Dipl.-Ing. Noé
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BWG Bergwerk und Walzwerk Maschinenbau GmbH
Original Assignee
BWG Bergwerk und Walzwerk Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BWG Bergwerk und Walzwerk Maschinenbau GmbH filed Critical BWG Bergwerk und Walzwerk Maschinenbau GmbH
Publication of EP0988904A2 publication Critical patent/EP0988904A2/en
Publication of EP0988904A3 publication Critical patent/EP0988904A3/en
Application granted granted Critical
Publication of EP0988904B1 publication Critical patent/EP0988904B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips

Definitions

  • the invention relates to a method for flatness measurement of strips, in particular metal strips, as they pass through of, for example, strip treatment plants, rolling mills or the like, after which the continuous belt with a predetermined strip tension is applied, and after which by means of at least one in a measuring range in a predetermined Distance from the belt surface arranged measuring device Band unevenness can be detected.
  • Such a method is the subject of, for example DE-PS 28 13 719. Is also comparable in the DE-OS 42 24 569 procedure.
  • Both previously known teachings have one thing in common, that as it were an indirect measurement of the flatness of the strip by measuring the band tension distribution over the Bandwidth is done using flatness measuring rollers. The Band tension distribution allows conclusions to be drawn Band flatness too.
  • the moving belt is deflected in the measuring direction using a power transmission device. there the deflection is measured and from this to the band flatness closed.
  • the known measurement methods work as it were indirectly, because different deflections of the Ribbon to differences in length of individual ribbon longitudinal fibers corresponding from which to the flatness of the volume is inferred.
  • flatness measuring rollers are only a limited one Show accuracy.
  • the longitudinal tension of the strip can be only with an accuracy of approx. 2 to 5 Mpa determine what the corresponding uncertainties in the Accuracy of the flatness measurement leads. Otherwise find Cross stresses in the band no precipitation, which is also affect the flatness. It must also be taken into account that even with a flat belt influences of neighboring deflection rollers, drive rollers or from the winding process the longitudinal stress distribution over the bandwidth influence.
  • the invention is based on the technical problem Method for measuring flatness of strips of the beginning further described configuration so that without Production loss - as it were online - a reliable one and exact flatness measurement can be achieved.
  • the invention teaches a method for achieving this object for measuring flatness of strips, especially metal strips, in the course of running through, for example, strip treatment plants, Rolling mills or the like, after which continuous belt with a given belt tension is acted upon, according to which at least one in one Measuring range at a specified distance from the belt surface arranged measuring device band unevenness contactless are detected, and then the tape tension in and / or immediately in front of the measuring range by a predetermined amount and consequently is specifically reduced to band-related errors exclude (for the most part) in the flatness measurement can.
  • the conveyor belt is usually pre-run and / or in the measuring range with a compared to the strip tensile force essentially opposite braking force applied, the braking force in terms of amount almost corresponds to the belt tension.
  • a belt treatment plant is within the scope of the invention to every conceivable device, which for transport, for Treatment, for coating etc. of a continuous Band is suitable.
  • the one required to transport the tape Tension or the associated belt tension becomes regular of train drivers or a set of pull rollers and one Brake roller set applied.
  • Under the belt surface is in the present case the band surface and / or the band bottom surface - in contrast to the strip cross-sectional area - to understand.
  • the continuous band is preferably at least one before, after and / or in the measuring range and if necessary at least one further one arranged after the measuring range Deflection roller guided, the upstream of the measuring range Deflection roller can be designed as a tension measuring roller and Determines the belt tension in the measuring range. there the belt tensile force in the measuring range continues regulate preferred embodiment of the invention.
  • this Context is usually used as the input variable of the tension measuring roller determined tape tensile force in the measuring range used, with appropriate control signals as the manipulated variable be transmitted to a braking force device. Naturally a control system is required for this appropriate signals and the evaluation of the Tension measuring roller takes measured values.
  • any other measuring device on the input side of the measuring range or within can come as long as this measuring device for determination the tape tension or the tape tension is suitable.
  • the braking force can be easily adjusted accordingly build up or adjust. This is done in such a way that the The braking force is almost equal to the belt tension, so that the continuous belt in the measuring area is almost draft-free is.
  • braking forces are used here, which correspond approximately to 98.99% of the belt tension.
  • a particularly preferred embodiment of the invention with independent meaning is characterized in that the braking force device the continuous belt with the the braking force opposing the belt tension applied without contact.
  • the braking force device the corresponding braking force in the continuous tape enters how this z.
  • B. means an S-roll set succeeds.
  • the contactless application of braking force is generally by means of at least made of a linear motor, such as in German patent application 197 19 994.1-32 to which express reference is made. Because additionally still the measuring device belt unevenness contactless a maximum total belt protection is recorded reached. There is a risk of belt surface damage locked out.
  • the measuring device works in the vertical direction compared to the continuous belt, namely across its entire range.
  • the of the The measuring device determined flatness values as input variables (Actual values) fed into a flatness control system are, where connected actuators for Flatness control (after a target / actual value comparison) be influenced accordingly. That said, it can basically be proceeded like this in the named DE-OS 42 24 569 is described.
  • the invention also relates to a device for Flatness measurement of strips, especially metal strips, with at least one device for loading the continuous belt with a predetermined belt tension and with at least one in a measuring range in a predetermined Distance from the belt surface arranged measuring device for the contactless detection of flatness of the strip, which is characterized by a particularly functional and simple construction.
  • a braking force device for targeted Reduction of the belt tension and to apply a Arranged braking force.
  • the braking device can work as at least a non-contact Be linear motor. But there is also the possibility that the braking force device from S-roller sets as well as pressure and drive rollers.
  • Such a device for Flatness measurement can also be used in rolling mills like with straightening systems or winding processes.
  • a device for measuring flatness of strips 1, according to the exemplary embodiment metal strips 1, is shown in the figures.
  • the continuous belt 1 is subjected to a predetermined belt tensile force F z , which is applied via a pull roller set 2 and a brake roller set 3.
  • the arrangement may be made in principle as it is shown in DE-OS 39 12 676 or DE-OS 26 25 414 (see FIG. 2).
  • the required belt tensile force F z is generated without contact by means of a linear motor 4 or more or a series of linear motors.
  • this linear motor 4 has a stator or inductor 5 and an armature 1.
  • This armature 1 is the metal strip 1.
  • the metal strip 1 moves over the linear motor 4, which can generate tension and / or pressure in the metal strip 1.
  • the stator 5 has coils arranged next to one another in slots between transverse teeth.
  • This measuring range M is designed as a vertical measuring section, with its Length essentially corresponds to the maximum bandwidth.
  • the measuring device 6 is at a predetermined distance A from the Belt surface arranged and detected belt unevenness.
  • the strip tensile force F z is deliberately reduced in order to be able to rule out strip tension-related errors in the flatness measurement.
  • the braking force B is opposite to that of the strip tensile force F z .
  • This braking force B is applied by a braking force device 7.
  • This braking force device 7, according to the exemplary embodiment in FIG. 1, is a linear motor 7, while in the exemplary embodiment according to FIG. 2, two S-roller sets 7a, 7b are provided. 1, the braking force device 7 is arranged within the measuring range M, while, as shown in FIG. 2, an arrangement in front of it (and behind it) is tracked. Mixed forms are of course also conceivable.
  • the linear motor 7 operates contactlessly and generates the braking force B at this point in such a way that the metal strip 1 is acted upon by a continuous field which is opposite to the linear motor 4.
  • belt tension F z and braking force B are directed in opposite directions, as the associated force vectors make clear in the figures.
  • angular positions are also within the scope of the invention, in which case the actually acting braking force B is measured on the basis of the horizontal component B H lying in the direction of the strip tension or the direction of the force of the strip, as is indicated in FIG. 1.
  • B v designates the corresponding vertical component of the braking force B. -
  • the above illustration also makes it clear that the braking force B (or B H ) and the band tension force F z are of almost equal magnitude.
  • the continuous strip or metal strip 1 is guided over at least one deflection roller 8 arranged in front of or in the measuring area M.
  • a further deflection roller 9 arranged after the measuring range M can be provided. This also applies to the deflection roller 10 which is also implemented within the measuring range.
  • the deflection roller 8 upstream of the measuring range M is designed as a tension measuring roller 8 and is used to determine the tape tensile force F z within the measuring range M.
  • a control system 11 is also provided, to which the tension measuring roller 8 upstream of the measuring range M is connected.
  • the aforementioned tension measuring roller 8 supplies actual values of the tape tension force -F z to the aforementioned control system 11, which influences the braking force device 7 accordingly in order to control the braking force B and to set the desired tape tension force F z in the measuring range M.
  • the braking force device 7 is connected to the control system 11 and is subjected to derived default values.
  • control system 11 controls the electrical power supplied to the respectively associated stator 5 of the linear motor 7 and thus the braking force B.
  • the direction of the current flow can also generally be influenced in this way, although in the present case this is always chosen such that the braking force B is directed counter to the belt tensile force F z .
  • the measuring device 6 is as shown Representation around a CCD camera. Of course is on a laser-optical distance meter is also conceivable at this point. In the same way, inductive or capacitive Sensors are used. Moiré processes can also be used for flatness measurement.
  • the measuring device 6 in the vertical direction V compared to continuous band 1 with a predetermined distance A above arranged the band surface and works according to the embodiment without contact.
  • flatness measuring rollers conceivable, although not preferred.
  • the braking force B is applied via local S-roller sets 7a, 7b with associated pressure rollers 12.
  • These S-roller sets 7a, 7b can in principle be driven at different speeds, so that the desired reduction in the belt tensile force F z or the application of the braking force B can be represented without problems. This is usually done via the gearboxes with speed control assigned to the respective S-roller sets 7a, 7b, which are not shown in detail.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The front tension force (Fz) is reduced before and/or in the measuring region (M) to be able to exclude errors caused by the front tension during planarity measurements. Process for measuring the planarity of metal strips (1) during the course of passing the strip through a strip treatment plant or rolling mill comprises applying a prescribed tension force (Fz) to the strip passing through the mill of treatment plant, and detecting strip irregularities using a measuring device (6) arranged in the measuring region (M) at a prescribed distance (A) from the strip surface. The front tension force (Fz) is reduced before and/or in the measuring region (M) to be able to exclude errors caused by the front tension during planarity measurements. An Independent claim is also included for an apparatus for measuring the planarity of metal strips during the course of passing the strip through a strip treatment plant or rolling mill.

Description

Die Erfindung betrifft ein Verfahren zur Planheitsmessung von Bändern, insbesondere Metallbändern, im Zuge des Durchlaufens von beispielsweise Bandbehandlungsanlagen, Walzwerken oder dergleichen, wonach das durchlaufende Band mit einer vorgegebenen Bandzugkraft beaufschlagt wird, und wonach mittels zumindest einer in einem Messbereich in vorgegebenem Abstand von der Bandoberfläche angeordneten Messvorrichtung Bandunplanheiten detektiert werden.The invention relates to a method for flatness measurement of strips, in particular metal strips, as they pass through of, for example, strip treatment plants, rolling mills or the like, after which the continuous belt with a predetermined strip tension is applied, and after which by means of at least one in a measuring range in a predetermined Distance from the belt surface arranged measuring device Band unevenness can be detected.

Ein derartiges Verfahren ist beispielsweise Gegenstand der DE-PS 28 13 719. Vergleichbar wird auch in der DE-OS 42 24 569 verfahren. Beiden vorbekannten Lehren ist gemein, dass gleichsam eine indirekte Messung der Bandplanheit durch Messung der Bandspannungsverteilung über die Bandbreite mithilfe von Planheitsmessrollen erfolgt. Die Bandspannungsverteilung lässt dabei Rückschlüsse auf die Bandplanheit zu. Insbesondere bei der erstgenannten Schrift erfolgt eine Auslenkung des durchlaufenden Bandes in Messrichtung mithilfe einer Kraftübertragungseinrichtung. Dabei wird die Auslenkung gemessen und hieraus auf die Bandplanheit geschlossen. Die vorbekannten Messmethoden arbeiten gleichsam indirekt, weil unterschiedliche Auslenkungen des Bandes zu Längenunterschieden einzelner Bandlängsfasern korrespondierenden, aus denen auf die Planheit des Bandes rückgeschlossen wird. Such a method is the subject of, for example DE-PS 28 13 719. Is also comparable in the DE-OS 42 24 569 procedure. Both previously known teachings have one thing in common, that as it were an indirect measurement of the flatness of the strip by measuring the band tension distribution over the Bandwidth is done using flatness measuring rollers. The Band tension distribution allows conclusions to be drawn Band flatness too. Especially with the first mentioned font the moving belt is deflected in the measuring direction using a power transmission device. there the deflection is measured and from this to the band flatness closed. The known measurement methods work as it were indirectly, because different deflections of the Ribbon to differences in length of individual ribbon longitudinal fibers corresponding from which to the flatness of the volume is inferred.

Unabhängig davon kennt man die direkte Messung der Bandplanheit an einer Tafel oder einem Band im Stillstand, das heißt im zugentlasteten Zustand. Derartiges ist für zumeist kontinuierliche Bandbehandlungsanlagen inakzeptabel, weil mit Produktionsunterbrechungen verbunden.Regardless of this, one knows the direct measurement of the Band flatness on a blackboard or a band at a standstill, that is, in the strain-relieved state. Such is for mostly continuous strip processing plants unacceptable, because of production interruptions.

Hinzu kommt, dass Planheitsmessrollen nur eine begrenzte Genauigkeit aufweisen. Beispielsweise lässt sich die Bandlängszugspannung nur mit einer Genauigkeit von ca. 2 bis 5 Mpa ermitteln, was zu entsprechenden Unsicherheiten bei der Genauigkeit der Planheitsmessung führt. Im übrigen finden Querspannungen im Band keinen Niederschlag, welche sich ebenfalls auf die Planlage auswirken. Ferner ist zu berücksichtigen, dass selbst bei planem Band Einflüsse von benachbarten Umlenkrollen, Treibrollen oder vom Aufwickelprozess die Bandlängsspannungsverteilung über der Bandbreite beeinflussen.In addition, flatness measuring rollers are only a limited one Show accuracy. For example, the longitudinal tension of the strip can be only with an accuracy of approx. 2 to 5 Mpa determine what the corresponding uncertainties in the Accuracy of the flatness measurement leads. Otherwise find Cross stresses in the band no precipitation, which is also affect the flatness. It must also be taken into account that even with a flat belt influences of neighboring deflection rollers, drive rollers or from the winding process the longitudinal stress distribution over the bandwidth influence.

Für die direkte Messung der Bandplanheit im Stillstand gilt darüber hinaus, dass praktisch nur ein Ausschnitt des Bandes erfasst wird. Außerdem lassen sich ggf. Stillstandsmarkierungen von angestellten Rollen nicht mehr immer zuverlässig vermeiden.The following applies to the direct measurement of the strip flatness at standstill moreover, that practically only a section of the Tape is detected. In addition, standstill markings can be made if necessary of employed roles no longer always avoid reliably.

Außerdem kennt man ein Verfahren zum Messen von Unplanheiten und zum korrigieren derartiger Unplanheiten im Zuge des Walzen des Bandes in einem Walzwerk. Um die Genauigkeit des Verfahrens zu erhöhen, soll die Messung in einem Bereich mit konstanter minimaler Spannung durchgeführt werden. Dazu ist der Messbereich zwischen einem Walzwerk und einer Aufwickelhaspel angeordnet, wobei er von zwei Rollenpaaren gebildet wird. Auf der Oberfläche eines Messtisches soll das Band praktisch ohne Spannung sein und so die Messung vereinfachen (vgl. SU 1 219 196 A).There is also a known method for measuring unevenness and to correct such flatness in the course of rolling the strip in a rolling mill. To the accuracy The aim of the procedure is to increase the measurement in one Area performed with constant minimum voltage become. This is the measuring range between a rolling mill and a take-up reel, being made up of two Roll pairs is formed. On the surface of a measuring table the tape should be practically without tension and such simplify the measurement (see SU 1 219 196 A).

Der Erfindung liegt das technische Problem zu Grunde, ein Verfahren zur Planheitsmessung von Bändern der eingangs beschriebenen Ausgestaltung so weiterzubilden, dass ohne Produktionsausfall - gleichsam On-Line - eine zuverlässige und genaue Planheitsmessung erreicht werden kann.The invention is based on the technical problem Method for measuring flatness of strips of the beginning further described configuration so that without Production loss - as it were online - a reliable one and exact flatness measurement can be achieved.

Zur Lösung dieser Aufgabe lehrt die Erfindung ein Verfahren zur Planheitsmessung von Bändern, insbesondere Metallbändern, im Zuge des Durchlaufens von beispielsweise Bandbehandlungsanlagen, Walzwerken oder dergleichen, wonach das durchlaufende Band mit einer vorgegebenen Bandzugkraft beaufschlagt wird, wonach mittels zumindest einer in einem Messbereich in vorgegebenem Abstand von der Bandoberfläche angeordneten Messvorrichtung Bandunplanheiten berührungslos detektiert werden, und wonach die Bandzugkraft in und/oder unmittelbar vor dem Messbereich um ein vorgegebenes Maß und folglich gezielt verringert wird, um bandzugbedingte Fehler bei der Planheitsmessung (größtenteils) ausschließen zu können. Dabei wird das durchlaufende Band üblicherweise vor und/oder im Messbereich mit einer im Vergleich zur Bandzugkraft im wesentlichen entgegengesetzt gerichteten Bremskraft beaufschlagt, wobei die Bremskraft betragsmäßig nahezu der Bandzugkraft entspricht. - Bei einer Bandbehandlungsanlage handelt es sich im Rahmen der Erfindung um jede denkbare Vorrichtung, welche zum Transport, zur Behandlung, zur Beschichtung usw. eines durchlaufenden Bandes geeignet ist. Der zum Transport des Bandes erforderliche Zug bzw. die zugehörige Bandzugkraft wird regelmäßig von Zugtreibern bzw. einem Zugrollensatz sowie einem Bremsrollensatz aufgebracht. Unter der Bandoberfläche ist vorliegend die Bandoberfläche und/oder die Banduntenfläche - im Gegensatz zur Bandquerschnittsfläche - zu verstehen.The invention teaches a method for achieving this object for measuring flatness of strips, especially metal strips, in the course of running through, for example, strip treatment plants, Rolling mills or the like, after which continuous belt with a given belt tension is acted upon, according to which at least one in one Measuring range at a specified distance from the belt surface arranged measuring device band unevenness contactless are detected, and then the tape tension in and / or immediately in front of the measuring range by a predetermined amount and consequently is specifically reduced to band-related errors exclude (for the most part) in the flatness measurement can. The conveyor belt is usually pre-run and / or in the measuring range with a compared to the strip tensile force essentially opposite braking force applied, the braking force in terms of amount almost corresponds to the belt tension. - With a belt treatment plant is within the scope of the invention to every conceivable device, which for transport, for Treatment, for coating etc. of a continuous Band is suitable. The one required to transport the tape Tension or the associated belt tension becomes regular of train drivers or a set of pull rollers and one Brake roller set applied. Under the belt surface is in the present case the band surface and / or the band bottom surface - in contrast to the strip cross-sectional area - to understand.

Durch diese Maßnahmen der Erfindung wird erreicht, dass im Messbereich quasi-stationäre Bedingungen vorliegen. das heißt durchlaufende Band kaum (merklich) mit Zug beaufschlagt wird. Dementsprechend sind Verfälschungen durch die anliegende Bandzugkraft praktisch ausgeschlossen. Dieses gilt sowohl mit Blick auf nunmehr erfassbare Querspannungen als auch im Hinblick auf Messfehler bei der Ermittlung der Spannungsverteilung. Denn durch den an dieser Stelle praktisch nicht mehr vorhandenen Bandzug wird weder eine nicht gegebene Planheit vorgetäuscht noch findet ein Ausgleich von vorhandenen Querspannungen statt. Im Übrigen wird auf eine Auslenkung des Bandes zur Messung der Bandplanheit unter Bandzug bewusst verzichtet, was insbesondere bei dünnen Bändern und hier im Randbereich von Vorteil ist. Ferner wird die Prozessgeschwindigkeit praktisch nicht beeinflusst, weil das durchlaufende Band nur innerhalb eines definierten kurzen Bereiches (Messbereich) abgebremst wird und danach mit ggf. beschleunigter Geschwindigkeit einen Weitertransport erfährt. Schließlich lassen sich Stillstandsmarkierungen von angestellten Andrück- oder Treiberrollen auf der Bandoberfläche zuverlässig ausschließen.These measures of the invention ensure that in Measuring range quasi-stationary conditions are present. the means continuous belt hardly (noticeably) subjected to train becomes. Accordingly, adulterations are caused by the applied belt tension practically excluded. This applies both with a view to transverse voltages that can now be detected as well as with regard to measurement errors in determining the Voltage distribution. Because by at this point practically no longer existing belt tension is neither flatness that is not given is simulated nor is it compensated of existing transverse stresses instead. Furthermore is based on a deflection of the band to measure the Band flatness deliberately dispenses with band tension, which in particular an advantage for thin tapes and here in the edge area is. Furthermore, the process speed becomes practical not affected because the continuous band is only within a defined short range (measuring range) braked and then at an accelerated speed if necessary undergoes further transport. Finally leave standstill marks from employed pressure or Exclude driver rollers on the belt surface reliably.

Vorzugsweise wird das durchlaufende Band über zumindest eine vor, nach und/oder in dem Messbereich und ggf. zumindest eine weitere nach dem Messbereich angeordnete Umlenkrolle geführt, wobei die dem Messbereich vorgeordnete Umlenkrolle als Zugmessrolle ausgebildet sein kann und zur Bestimmung der Bandzugkraft im Messbereich dient. Dabei läst sich die Bandzugkraft im Messbereich nach weiter bevorzugte Ausführungsform der Erfindung regeln. In diesem Zusammenhang wird als Eingangsgröße üblicherweise die von der Zugmessrolle ermittelte Bandzugkraft im Messbereich eingesetzt, wobei als Stellgröße entsprechende Regelsignale an eine Bremskraftvorrichtung übermittelt werden. Natürlich wird hierzu eine Regelanlage benötigt, die für die entsprechenden Signale sorgt und die Auswertung der von der Zugmessrolle erfassten Messwerte übernimmt.The continuous band is preferably at least one before, after and / or in the measuring range and if necessary at least one further one arranged after the measuring range Deflection roller guided, the upstream of the measuring range Deflection roller can be designed as a tension measuring roller and Determines the belt tension in the measuring range. there the belt tensile force in the measuring range continues regulate preferred embodiment of the invention. In this Context is usually used as the input variable of the tension measuring roller determined tape tensile force in the measuring range used, with appropriate control signals as the manipulated variable be transmitted to a braking force device. Naturally a control system is required for this appropriate signals and the evaluation of the Tension measuring roller takes measured values.

Es sollte betont werden, dass generell an Stelle der Zugmessrolle selbstverständlich jedwede andere Messvorrichtung eingangsseitig des Messbereiches oder innerhalb zum Einsatz kommen kann, solange diese Messvorrichtung zur Ermittlung des Bandzuges bzw. der Bandzugkraft geeignet ist. Sobald man den eingangsseitig oder innerhalb des Messbereiches vorliegenden Bandzug bzw. die zugehörige Bandzugkraft kennt, lässt sich problemlos die Bremskraft entsprechend aufbauen bzw. einstellen. Dies erfolgt dergestalt, dass die Bremskraft betragsmäßig nahezu der Bandzugkraft entspricht, so dass das durchlaufende Band im Messbereich fast zugfrei ist. Üblicherweise wird hier mit Bremskräften gearbeitet, die in etwa bis 98,99 % der Bandzugkraft entsprechen.It should be emphasized that generally in place of the tension measuring roller of course any other measuring device on the input side of the measuring range or within can come as long as this measuring device for determination the tape tension or the tape tension is suitable. As soon as one on the input side or within the measuring range existing belt tension or the associated belt tension knows, the braking force can be easily adjusted accordingly build up or adjust. This is done in such a way that the The braking force is almost equal to the belt tension, so that the continuous belt in the measuring area is almost draft-free is. Usually braking forces are used here, which correspond approximately to 98.99% of the belt tension.

Eine besonders bevorzugte Ausgestaltung der Erfindung, mit selbstständiger Bedeutung ist dadurch gekennzeichnet, dass die Bremskraftvorrichtung das durchlaufende Band mit der der Bandzugkraft entgegengesetzt gerichteten Bremskraft berührungslos beaufschlagt. Selbstverständlich liegt es auch im Rahmen der Erfindung, dass die Bremskraftvorrichtung über Reibkräfte die entsprechende Bremskraft in das durchlaufende Band einträgt, wie dieses z. B. mittels eines S-Rollensatzes gelingt. Die berührungslose Bremskraftbeaufschlagung wird im Allgemeinen mittels zumindest eines Linearmotors vorgenommen, wie er beispielsweise in der deutschen Patentanmeldung 197 19 994.1-32 beschrieben ist, auf die ausdrücklich Bezug genommen wird. Da zusätzlich noch die Messvorrichtung Bandunplanheiten berührungslos erfasst, wird eine insgesamt maximale Bandschonung erreicht. Die Gefahr von Bandoberflächenbeschädigungen ist ausgeschlossen. Dabei ist zu berücksichtigen, dass ein derartiger Linearmotor mit Stator bzw. Induktor sowie Anker in der Funktionsweise einem "normalen" elektrischen (Asynchron-)Motor ähnelt. Denn bei ihm führt die Erzeugung eines fortlaufenden Wechselfeldes des gleichsam in eine Ebene "aufgerollten" Stators zu einer Linearbewegung des Ankers (Metallband). Dieses lässt sich darauf zurückführen, dass in dem Anker ein im Vergleich zum Stator gleichgerichtetes elektromagnetisches Feld über Induktion erzeugt wird. Derartige Gegenfelder lassen sich jedoch nicht in sämtlichen Materialien erzielen, sodass beispielsweise austenitische Edelstähle nicht auf die skizzierte Weise behandelt werden können, sonders hier die Bremskraft reibend in das Band eingetragen werden muss. A particularly preferred embodiment of the invention, with independent meaning is characterized in that the braking force device the continuous belt with the the braking force opposing the belt tension applied without contact. Of course it is also in the context of the invention that the braking force device the corresponding braking force in the continuous tape enters how this z. B. means an S-roll set succeeds. The contactless application of braking force is generally by means of at least made of a linear motor, such as in German patent application 197 19 994.1-32 to which express reference is made. Because additionally still the measuring device belt unevenness contactless a maximum total belt protection is recorded reached. There is a risk of belt surface damage locked out. It should be borne in mind that a such a linear motor with stator or inductor and armature in the functioning of a "normal" electric (asynchronous) motor similar. Because with him the generation of one leads continuous alternating field of, as it were, in one plane "Rolled up" stator for linear movement of the armature (Metal band). This can be attributed to the fact that in the armature a rectified in comparison to the stator electromagnetic field is generated via induction. such However, opposing fields cannot be found in all Achieve materials such as austenitic Stainless steels cannot be treated in the manner outlined can, especially here the braking force rubbing into the belt must be entered.

Im Allgemeinen arbeitet die Messvorrichtung in Vertikalrichtung in Vergleich zum durchlaufenden Band, und zwar über dessen gesamte Bandbreite. Dabei können die von der Messvorrichtung ermittelten Planheitswerte als Eingangsgrößen (Ist-Werte) in eine Planheitsregelanlage eingespeist werden, wobei hieran angeschlossene Stellglieder zur Regelung der Planheit (nach einem Soll/Ist-Wert-Vergleich) entsprechend beeinflusst werden. Das heißt, es kann grundsätzlich so verfahren werden, wie dieses in der bereits benannten DE-OS 42 24 569 beschrieben ist.In general, the measuring device works in the vertical direction compared to the continuous belt, namely across its entire range. The of the The measuring device determined flatness values as input variables (Actual values) fed into a flatness control system are, where connected actuators for Flatness control (after a target / actual value comparison) be influenced accordingly. That said, it can basically be proceeded like this in the named DE-OS 42 24 569 is described.

Gegenstand der Erfindung ist auch eine Vorrichtung zur Planheitsmessung von Bändern, insbesondere Metallbändern, mit zumindest einer Vorrichtung zur Beaufschlagung des durchlaufenden Bandes mit einer vorgegebenen Bandzugkraft und mit zumindest einer in einem Messbereich in vorgegebenem Abstand von der Bandoberfläche angeordneten Messvorrichtung zur berührungslosen Detektion von Bandplanheiten, die sich durch eine besonders funktionsgerechte und einfache Bauweise auszeichnet. Vor dem und/oder im Messbereich ist eine Bremskraftvorrichtung zur gezielten Verringerung der Bandzugkraft und zur Aufbringung einer Bremskraft angeordnet. Die Bremskraftvorrichtung kann als zumindest ein berührungslos arbeitender Linearmotor ausgebildet sein. Es besteht aber auch die Möglichkeit, daß die Bremskraftvorrichtung aus S-Rollensätzen sowie Andrück- und Treibrollen besteht. Bevorzugt ist der Meßbereich als vertikale Meßstrecke ausgebildet, wobei die Länge der Meßstrecke in der Größenordnung der maximalen Bandbreite liegen sollte. - Eine derartige Vorrichtung zur Planheitsmessung läßt sich bei Walzwerken ebenso einsetzen wie bei Richtanlagen oder Aufwickelprozessen.The invention also relates to a device for Flatness measurement of strips, especially metal strips, with at least one device for loading the continuous belt with a predetermined belt tension and with at least one in a measuring range in a predetermined Distance from the belt surface arranged measuring device for the contactless detection of flatness of the strip, which is characterized by a particularly functional and simple construction. In front of and / or in the measuring range is a braking force device for targeted Reduction of the belt tension and to apply a Arranged braking force. The braking device can work as at least a non-contact Be linear motor. But there is also the possibility that the braking force device from S-roller sets as well as pressure and drive rollers. The is preferred Measuring range designed as a vertical measuring section, the Length of the measuring section in the order of the maximum Bandwidth should be. - Such a device for Flatness measurement can also be used in rolling mills like with straightening systems or winding processes.

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

Fig. 1
eine erste Ausführungsform der Erfindung mit berührungsloser Einleitung der Bremskraft und
Fig. 2
eine abgewandelte Ausgestaltung, dieses Mal für die berührende Einbringung der Bremskraft, beispielsweise bei austenitischen Edelstählen.
In the following, the invention is explained in more detail with reference to a drawing that shows only one exemplary embodiment; show it:
Fig. 1
a first embodiment of the invention with contactless introduction of the braking force and
Fig. 2
a modified configuration, this time for the touching application of the braking force, for example in the case of austenitic stainless steels.

In den Figuren ist eine Vorrichtung zur Planheitsmessung von Bändern 1, nach dem Ausführungsbeispiel Metallbändern 1 gezeigt. Dabei wird das durchlaufende Band 1 mit einer vorgegebenen Bandzugkraft Fz beaufschlagt, welche über einen Zugrollensatz 2 und einen Bremsrollensatz 3 aufgebracht wird. Die Anordnung mag dabei vom Prinzip her so getroffen sein, wie dieses in der DE-OS 39 12 676 oder der DE-OS 26 25 414 dargestellt ist (vergl. Fig. 2). - Bei dem Ausführungsbeispiel nach Fig. 1 wird die erforderliche Bandzugkraft Fz mittels eines Linearmotors 4 oder mehrerer bzw. einer Reihe von Linearmotoren berührungslos erzeugt. Dieser Linearmotor 4 weist ausweislich des vergrößerten Ausschnittes in Fig. 1 einen Stator bzw. Induktor 5 und einen Anker 1 auf. Bei diesem Anker 1 handelt es sich um das Metallband 1. Das Metallband 1 bewegt sich über den Linearmotor 4 hinweg, wobei dieser in dem Metallband 1 Zug und/oder Druck erzeugen kann. Der Stator 5 weist nebeneinander angeordnete Spulen in Schlitzen zwischen Querzähnen auf.A device for measuring flatness of strips 1, according to the exemplary embodiment metal strips 1, is shown in the figures. The continuous belt 1 is subjected to a predetermined belt tensile force F z , which is applied via a pull roller set 2 and a brake roller set 3. The arrangement may be made in principle as it is shown in DE-OS 39 12 676 or DE-OS 26 25 414 (see FIG. 2). In the exemplary embodiment according to FIG. 1, the required belt tensile force F z is generated without contact by means of a linear motor 4 or more or a series of linear motors. According to the enlarged detail in FIG. 1, this linear motor 4 has a stator or inductor 5 and an armature 1. This armature 1 is the metal strip 1. The metal strip 1 moves over the linear motor 4, which can generate tension and / or pressure in the metal strip 1. The stator 5 has coils arranged next to one another in slots between transverse teeth.

Vorliegend sind zwei mit Spalt sich gegenüberliegende Statoren 5 vorgesehen, zwischen denen das Metallband 1 hindurchgeführt wird. Diese Vorgehensweise läßt sich dadurch erklären, daß der Anker 1 aus üblicherweise nichtferromagnetischem Material in undefinierter Weise vom Stator 5 abgestoßen wird. Derartiges liegt daran, daß das im Anker 1 induzierte Feld und das Statorfeld gleichgerichtet sind. Jedenfalls läßt sich ein derartiger Anker 1 bzw. das Metallband 1 einwandfrei in Linearrichtung am einfachsten für den Fall fortbewegen, daß es zwischen den beiden mit Spalt gegenüberliegend angeordneten Statoren 5 geführt wird. Denn durch diese Anordnung heben sich die jeweils entgegengesetzten Abstoßungskräfte in bezug auf den jeweiligen Anker 1 gegenseitig auf, so daß gleichsam ein "Schwebezustand" des Metallbandes 1 erreichbar ist.There are two stators opposite each other with a gap 5 provided between which the metal strip 1 is passed becomes. This procedure can be done explain that the armature 1 is made of usually non-ferromagnetic Material from stator 5 in an undefined manner is repelled. Such is because the anchor in the 1st induced field and the stator field are rectified. In any case, such an anchor 1 or that Metal strip 1 is easiest in the linear direction in case it gets between the two with Stator 5 arranged opposite gap becomes. Because of this arrangement, each one stands out opposite repulsive forces with respect to each Anchor 1 on each other, so that as it were "Floating state" of the metal strip 1 can be reached.

Darüber hinaus findet sich ein Meßbereich M innerhalb dessen eine Meßvorrichtung 6 vorgesehen ist. Dieser Meßbereich M ist als vertikale Meßstrecke ausgeführt, wobei seine Länge im wesentlichen der maximalen Bandbreite entspricht. Die Meßvorrichtung 6 ist in vorgegebenem Abstand A von der Bandoberfläche angeordnet und detektiert Bandunplanheiten. In addition, there is a measuring range M within it a measuring device 6 is provided. This measuring range M is designed as a vertical measuring section, with its Length essentially corresponds to the maximum bandwidth. The measuring device 6 is at a predetermined distance A from the Belt surface arranged and detected belt unevenness.

Innerhalb des Meßbereiches M und/oder unmittelbar davor wird die Bandzugkraft Fz gezielt verringert, um bandzugbedingte Fehler bei der Planheitsmessung ausschließen zu können. Zu diesem Zweck wird im Meßbereich M mit einer im Vergleich zur Bandzugkraft Fz entgegengesetzt gerichteten Bremskraft B gearbeitet. Diese Bremskraft B wird von einer Bremskraftvorrichtung 7 aufgebracht. Bei dieser Bremskraftvorrichtung 7 handelt es sich nach dem Ausführungsbeispiel in Fig. 1 um einen Linearmotor 7, während in dem Ausführungsbeispiel nach Fig. 2 jeweils zwei S-Rollensätze 7a, 7b vorgesehen sind. Ausweislich der Fig. 1 ist die Bremskraftvorrichtung 7 innerhalb des Meßbereiches M angeordnet, während nach der Darstellung in Fig. 2 eine Anordnung davor (und dahinter) verfolgt wird. Selbstverständlich sind auch Mischformen denkbar.Within the measuring range M and / or immediately before it, the strip tensile force F z is deliberately reduced in order to be able to rule out strip tension-related errors in the flatness measurement. For this purpose, in the measuring range M the braking force B is opposite to that of the strip tensile force F z . This braking force B is applied by a braking force device 7. This braking force device 7, according to the exemplary embodiment in FIG. 1, is a linear motor 7, while in the exemplary embodiment according to FIG. 2, two S-roller sets 7a, 7b are provided. 1, the braking force device 7 is arranged within the measuring range M, while, as shown in FIG. 2, an arrangement in front of it (and behind it) is tracked. Mixed forms are of course also conceivable.

Der Linearmotor 7 nach Fig. 1 arbeitet berührungslos und erzeugt die Bremskraft B an dieser Stelle dergestalt, daß das Metallband 1 mit einem im Vergleich zum Linearmotor 4 entgegengesetzt gerichteten fortlaufenden Feld beaufschlagt wird. Jedenfalls sind Bandzugkraft Fz und Bremskraft B entgegengesetzt gerichtet, wie die zugehörigen Kraftvektoren in den Figuren deutlich machen. Selbstverständlich liegen auch Winkelstellungen im Rahmen der Erfindung, wobei sich für diesen Fall die tatsächlich wirkende Bremskraft B anhand der in Bandzugrichtung bzw. Bandzugkraftrichtung liegenden Horizontalkomponente BH bemißt, wie dieses in Fig. 1 angedeutet ist. Bv bezeichnet hierbei die korrespondierende Vertikalkomponente der Bremskraft B. - Die vorgenannte Darstellung macht darüber hinaus deutlich, daß die Bremskraft B (bzw. BH) und die Bandzugkraft Fz betragsmäßig nahezu gleich groß ausgebildet sind.The linear motor 7 according to FIG. 1 operates contactlessly and generates the braking force B at this point in such a way that the metal strip 1 is acted upon by a continuous field which is opposite to the linear motor 4. In any case, belt tension F z and braking force B are directed in opposite directions, as the associated force vectors make clear in the figures. Of course, angular positions are also within the scope of the invention, in which case the actually acting braking force B is measured on the basis of the horizontal component B H lying in the direction of the strip tension or the direction of the force of the strip, as is indicated in FIG. 1. B v designates the corresponding vertical component of the braking force B. - The above illustration also makes it clear that the braking force B (or B H ) and the band tension force F z are of almost equal magnitude.

Das durchlaufende Band bzw. Metallband 1 wird über zumindest eine vor oder in dem Meßbereich M angeordnete Umlenkrolle 8 geführt. Zusätzlich kann eine weitere, nach dem Meßbereich M angeordnete Umlenkrolle 9 vorgesehen sein. Dieses gilt auch für die ferner innerhalb des Meßbereiches verwirklichte Umlenkrolle 10. Jedenfalls ist die dem Meßbereich M vorgeordnete Umlenkrolle 8 als Zugmeßrolle 8 ausgebildet und dient zur Bestimmung der Bandzugkraft Fz innerhalb des Meßbereiches M.The continuous strip or metal strip 1 is guided over at least one deflection roller 8 arranged in front of or in the measuring area M. In addition, a further deflection roller 9 arranged after the measuring range M can be provided. This also applies to the deflection roller 10 which is also implemented within the measuring range. In any case, the deflection roller 8 upstream of the measuring range M is designed as a tension measuring roller 8 and is used to determine the tape tensile force F z within the measuring range M.

Nach dem Ausführungsbeispiel in Fig. 1 ist ferner eine Regelanlage 11 vorgesehen, an welche die dem Meßbereich M vorgeordnete Zugmeßrolle 8 angeschlossen ist. Die vorgenannte Zugmeßrolle 8 liefert dabei Ist-Werte der Bandzugkraft -Fz an die vorgenannte Regelanlage 11, wobei diese zur Steuerung der Bremskraft B und Einstellung der gewünschten Bandzugkraft Fz im Meßbereich M die Bremskraftvorrichtung 7 entsprechend beeinflußt. Zu diesem Zweck ist die Bremskraftvorrichtung 7 an die Regelanlage 11 angeschlossen und wird mit abgeleiteten Vorgabewerten beaufschlagt.According to the exemplary embodiment in FIG. 1, a control system 11 is also provided, to which the tension measuring roller 8 upstream of the measuring range M is connected. The aforementioned tension measuring roller 8 supplies actual values of the tape tension force -F z to the aforementioned control system 11, which influences the braking force device 7 accordingly in order to control the braking force B and to set the desired tape tension force F z in the measuring range M. For this purpose, the braking force device 7 is connected to the control system 11 and is subjected to derived default values.

Denkbar ist es in diesem Zusammenhang, daß die Regelanlage 11 die dem jeweils zugehörigen Stator 5 des Linearmotors 7 zugeführte elektrische Leistung und damit die Bremskraft B steuert. Selbstverständlich läßt sich auf diese Weise generell auch die Stromlaufrichtung beeinflussen, wenngleich diese vorliegend immer so gewählt ist, daß die Bremskraft B entgegengesetzt zur Bandzugkraft Fz gerichtet ist.It is conceivable in this connection that the control system 11 controls the electrical power supplied to the respectively associated stator 5 of the linear motor 7 and thus the braking force B. Of course, the direction of the current flow can also generally be influenced in this way, although in the present case this is always chosen such that the braking force B is directed counter to the belt tensile force F z .

Bei der Meßvorrichtung 6 handelt es sich nach der gezeigten Darstellung um eine CCD-Kamera. Selbstverständlich ist an dieser Stelle auch ein laseroptischer Abstandsmesser denkbar. In gleicher Weise können induktive oder kapazitive Sensoren zum Einsatz kommen. Auch Moiré-Verfahren können zur Planheitsmessung verwirklicht werden. Jedenfalls ist die Meßvorrichtung 6 in Vertikalrichtung V im Vergleich zum durchlaufenden Band 1 mit vorgegebenem Abstand A oberhalb der Bandoberfläche angeordnet und arbeitet nach dem Ausführungsbeispiel berührungslos. Außerdem erfolgt eine Erfassung von beispielsweise Abstandsänderungen oder Bandunregelmäßigkeiten bzw. Bandunplanheiten über die gesamte Bandbreite des Metallbandes 1. Generell ist hier (das heißt an dieser Stelle) auch der Einsatz von Planheitsmeßrollen denkbar, wenngleich nicht bevorzugt.The measuring device 6 is as shown Representation around a CCD camera. Of course is on a laser-optical distance meter is also conceivable at this point. In the same way, inductive or capacitive Sensors are used. Moiré processes can also be used for flatness measurement. Anyway the measuring device 6 in the vertical direction V compared to continuous band 1 with a predetermined distance A above arranged the band surface and works according to the embodiment without contact. There is also an entry for example changes in distance or band irregularities or band unevenness over the entire Band width of the metal strip 1. Generally here (that is at this point) also the use of flatness measuring rollers conceivable, although not preferred.

Nach dem Ausführungsbeispiel in Fig. 2 wird die Bremskraft B über dortige S-Rollensätze 7a, 7b mit zugehörigen Andrückrollen 12 aufgebracht. Diese S-Rollensätze 7a, 7b können grundsätzlich mit unterschiedlichen Geschwindigkeiten gefahren werden, so daß der gewünschte Abbau der Bandzugkraft Fz bzw. die Aufbringung der Bremskraft B problemlos dargestellt werden kann. Dieses geschieht üblicherweise über den jeweiligen S-Rollensätzen 7a, 7b zugeordnete Getriebe mit Geschwindigkeitsregelung, die im einzelnen nicht dargestellt sind. According to the exemplary embodiment in FIG. 2, the braking force B is applied via local S-roller sets 7a, 7b with associated pressure rollers 12. These S-roller sets 7a, 7b can in principle be driven at different speeds, so that the desired reduction in the belt tensile force F z or the application of the braking force B can be represented without problems. This is usually done via the gearboxes with speed control assigned to the respective S-roller sets 7a, 7b, which are not shown in detail.

Im Rahmen der Erfindung wird man zumindest eine der Rollen 13 des dem Meßbereich M nachgeschalteten S-Rollensatzes 7b mit entsprechend variierbarem Rollenmantel versehen. Dabei kann die Wahl der entsprechenden Wölbung des Rollenmantels in Abhängigkeit von den mittels der Meßvorrichtung 6 erfaßten Meßwerte erfolgen. Das heißt, im Rahmen der Erfindung ist nach dem Ausführungsbeipiel in Fig. 2 zusätzlich eine weitere Regelvorrichtung bzw. Planheitsregelanlage 14 vorgesehen, welche die Aus- bzw. Einwölbung der S-Rolle 13 im S-Rollensatz 7b beeinflußt, und zwar in Abhängigkeit von durch die Meßvorrichtung 6 ermittelten Planheitsmeßwerten. Hierdurch wird eine besonders kompakte und vorteilhafte Ausgestaltung erzielt, weil der dem Meßbereich M nachgeschaltete S-Rollensatz 7b nicht nur zur Erzeugung der erforderlichen Bremskraft B herangezogen wird, sondern gleichzeitig Planierungsfunktionen für das Metallband 1 übernehmen kann.Within the scope of the invention one becomes at least one of the roles 13 of the S-roller set 7b connected downstream of the measuring range M. provided with a correspondingly variable roller jacket. there can choose the appropriate curvature of the roll cover as a function of the measuring device 6 recorded measured values take place. That is, within the The invention is based on the exemplary embodiment in FIG. 2 an additional control device or flatness control system 14 provided, which the bulge the S-roll 13 in the S-roll set 7b, and depending on the determined by the measuring device 6 Planheitsmeßwerten. This makes one special compact and advantageous design achieved because of S-roller set 7b downstream of measuring range M not only used to generate the required braking force B. but at the same time planning functions for the Metal strip 1 can take over.

Claims (12)

  1. A method of measuring the flatness of strip (1), particularly metal strip (1), during the passage thereof through strip processing installations, rolling mills or the like, for example,
    wherein the strip (1) passing through is acted upon by a predetermined strip tension force (Fz),
    wherein regions of strip unevenness are detected in a contactless manner by means of at least one measuring device (6) disposed in a measuring region (M) at a predetermined distance (A) from the strip surface,
    and wherein the strip tension force (Fz) is deliberately reduced upstream of and/or in the measuring region (M) so as to be able to exclude errors in the flatness measurement which are due to the strip tension.
  2. A method according to claim 1, characterised in that the strip (1) passing through is acted upon upstream of and/or in the measuring region (M) by a braking force (B) which is oriented substantially opposite to the strip tension force (Fz), wherein the magnitude of the braking force (B) almost corresponds to that of the strip tension force (Fz).
  3. A method according to claim 1 or 2, characterised in that the strip (1) passing through is passed over at least one deflection roll (8) disposed upstream of, downstream of and/or in the measuring region (M), wherein said deflection roll (8) is formed as a tension measuring roll (8) and is employed for determining the strip tension force (Fz) in the measuring region (M).
  4. A method according to any one of claims 1 to 3, characterised in that the strip tension force (Fz) is controlled in the measuring region (M), wherein the strip tension force (Fz) which is determined by the tension measuring roll (8), for example, is measured as an input quantity in the measuring region (M) and wherein corresponding control signals are transmitted as a correcting variable to a braking force device (7).
  5. A method according to any one of claims 1 to 4, characterised in that the braking force device (7) acts upon the strip (1) passing through, without contact, with the braking force (B) which is oriented opposite to the strip tension force (F).
  6. A method according to any one of claims 1 to 5, characterised in that the measuring device (6) operates in a vertical direction (V) with respect to the strip (1) passing through and over the entire strip width thereof.
  7. A method according to any one of claims 1 to 6, characterised in that the flatness values determined by the measuring device (6) are fed as input quantities into a flatness control arrangement (14), wherein actuators (13) connected thereto are correspondingly influenced in order to control the flatness.
  8. An apparatus for measuring the flatness of strip (1), particularly metal strip (1), which passes through with a predetermined strip tension force, for carrying out the method according to any one of claims 1 to 7,
       comprising at least one measuring device (6), for the contactless detection of regions of strip unevenness, which is disposed in a measuring region (M) at a predetermined distance (A) from the strip surface,
    wherein a braking force device (7) for the deliberately reducing the strip tension force (Fz) and for applying a braking force (B) is disposed upstream of and/or in the measuring region (M).
  9. An apparatus according to claim 8, characterised in that the braking force device (7) is formed as at least one linear motor (7) which operates in a contactless manner.
  10. An apparatus according to claim 8 or 9, characterised in that the braking force device (7) is formed as at least one set of S-rolls (7a, 7b) which optionally comprises a contact pressure roll (12) and which is disposed upstream of the measuring region (M).
  11. An apparatus according to any one of claims 8 to 10, characterised in that at least one tension measuring roll (8) is provided which is disposed upstream or downstream of the measuring region (M) and/or in the measuring region (M) and which supplies feedback values of the strip tension force (Fz) in the measuring region (M) to a connected control arrangement (11), wherein the control arrangement (11) correspondingly influences the braking force device (7) in order to control the braking force (B) and to determine the desired strip tension force (Fz) in the measuring region (M).
  12. An apparatus according to any one of claims 8 to 11, characterised in that the measuring region (M) is formed as a vertical measuring section and the length of the measuring section optionally corresponds to the maximum strip width.
EP99116003A 1998-09-24 1999-08-14 Method and device for measuring the flatness of strips Expired - Lifetime EP0988904B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843899A DE19843899C1 (en) 1998-09-24 1998-09-24 Method and device for measuring flatness of strips
DE19843899 1998-09-24

Publications (3)

Publication Number Publication Date
EP0988904A2 EP0988904A2 (en) 2000-03-29
EP0988904A3 EP0988904A3 (en) 2003-01-22
EP0988904B1 true EP0988904B1 (en) 2004-02-25

Family

ID=7882157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116003A Expired - Lifetime EP0988904B1 (en) 1998-09-24 1999-08-14 Method and device for measuring the flatness of strips

Country Status (7)

Country Link
US (1) US6164104A (en)
EP (1) EP0988904B1 (en)
AT (1) ATE260151T1 (en)
CA (1) CA2283192C (en)
DE (2) DE19843899C1 (en)
ES (1) ES2212429T3 (en)
ZA (1) ZA995849B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU757340B2 (en) 1999-04-02 2003-02-20 Hunter Douglas Industries Bv Method and arrangement for automatic bow adjustment
ES2223334T3 (en) * 1999-05-28 2005-03-01 Ims-Messsysteme Gmbh PROCEDURE FOR THE DETERMINATION OF THE FLAVOR OF A BAND OF MATERIAL.
DE10224938B4 (en) * 2002-06-04 2010-06-17 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method and device for flatness measurement of bands
US20070006644A1 (en) * 2005-07-06 2007-01-11 Alcoa Inc. Continuous web stress distribution measurement sensor
EP3138639B1 (en) 2015-09-03 2021-03-24 SMS group GmbH Method for manufacturing a metallic belt by means of endless rolling
DE102015223600A1 (en) 2015-09-03 2017-03-09 Sms Group Gmbh Method for producing a metallic strip by endless rolling
EP3168570A1 (en) * 2015-11-10 2017-05-17 Primetals Technologies France SAS Method and device for measuring the planarity of a metal product
CN111085549B (en) * 2019-12-27 2021-05-18 山东钢铁集团日照有限公司 Method for automatically and sectionally discharging strip steel plate shape on line
CN114659435B (en) * 2022-03-18 2022-11-01 广东嘉元科技股份有限公司 Electrolytic copper foil warpage testing machine tool based on ear material and testing method

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2625414C2 (en) * 1976-06-05 1985-10-10 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Tensioning device for continuously running belts, especially metal belts
JPS588458B2 (en) * 1977-03-30 1983-02-16 株式会社日立製作所 shape detection device
DE3430034A1 (en) * 1984-08-16 1986-02-27 Mannesmann AG, 4000 Düsseldorf PLANNING REGULATION ON ROLLING MILLS
SU1219196A1 (en) * 1984-12-26 1986-03-23 Магнитогорский горно-металлургический институт им.Г.И.Носова Method of automatic control of planarity of strip in cold-rolling mills
US4860212A (en) * 1986-10-08 1989-08-22 Kabushiki Kaisha Kobe Seiko Sho Rolled strip shape detecting device with high accuracy
DE3912676A1 (en) * 1989-04-18 1990-10-25 Bwg Bergwerk Walzwerk METHOD AND DEVICE FOR CONTINUOUSLY REACHING THIN BANDS, ESPECIALLY METAL BANDS
JPH0523723A (en) * 1991-07-24 1993-02-02 Toshiba Corp Flatness measuring device and controller for continuous rolling mill provided with this flatness measuring device
US5471307A (en) * 1992-09-21 1995-11-28 Phase Shift Technology, Inc. Sheet flatness measurement system and method
US5546779A (en) * 1994-03-24 1996-08-20 Danieli United, Inc. Interstand strip gauge and profile conrol
DE19524729A1 (en) * 1995-07-07 1997-01-16 Sundwiger Eisen Maschinen Method and device for rolling strips with a non-uniform thickness and / or length distribution across their width
DE19719994B4 (en) * 1997-05-13 2005-01-05 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method for influencing the stress distribution in metal strips or sheets of, in particular, non-ferromagnetic material

Also Published As

Publication number Publication date
DE19843899C1 (en) 2000-05-04
CA2283192C (en) 2003-12-30
US6164104A (en) 2000-12-26
EP0988904A3 (en) 2003-01-22
ATE260151T1 (en) 2004-03-15
EP0988904A2 (en) 2000-03-29
ZA995849B (en) 2000-04-04
CA2283192A1 (en) 2000-03-24
DE59908627D1 (en) 2004-04-01
ES2212429T3 (en) 2004-07-16

Similar Documents

Publication Publication Date Title
EP2519365B1 (en) Method of controlling side guides of a metal strip
DE112004002903B4 (en) Roll wedge setting / control method for rolling plate-shaped material
EP0988904B1 (en) Method and device for measuring the flatness of strips
DE19719994B4 (en) Method for influencing the stress distribution in metal strips or sheets of, in particular, non-ferromagnetic material
DE1933887A1 (en) Method and device for controlling the shape of metal strips
DE2458606B2 (en) Method for detecting the flatness of a cold-rolled ferromagnetic strip and device for carrying out the method
EP1116952A2 (en) Method and device for contact-free measurement of the planarity of ferromagnetic metal sheets
WO2003054236A1 (en) Method and device for controlled straightening and cooling of a wide metal strip, especially a steel strip or sheet metal, running out of a hot rolled strip rolling mill
DE2735402C2 (en) Method and device for tracing the path on the basis of marking points
DE1773088A1 (en) Method and arrangement for the determination of local irregularities of strips
DE19725726C2 (en) Method for measuring flatness of strips, in particular metal strips
AT513568B1 (en) Tensile strength soft-sensor for positive-locking and stretch-bending machines
DE2129629A1 (en) Control system
DE19844305A1 (en) Combined control system for generating certain product properties when rolling steel grades in the austenitic, mixed austenitic-ferritic and ferritic range
DE2723720B2 (en) Stretch bending machine for metal strips
DE202015106767U1 (en) Tape Thickness Gauge
WO2006037456A1 (en) Device for the continuous lengthening of a metal strip by traction, and method for operating one such device
DE3837101A1 (en) Method for controlling the running of the strip during rolling in a mill train
DE102019006788A1 (en) Process for determining the flatness of a strip as well as system for carrying out the process and strip treatment plant
EP0045441B1 (en) Device for measuring the thickness of a strip running out of a rolling mill
EP0004598B1 (en) Process and circuit for interstand tension control in a continuous rolling mill having individual drives
DE102015121662A1 (en) Method for carrying out a strip thickness measurement and strip thickness measuring device
EP0279173A2 (en) Device for measuring the thickness variation of profile in sheet material, particularly in photographic base paper
DE1935726A1 (en) Method and device for measuring the degree of stretching of rolled magnetic sheet
DE2237049A1 (en) DEVICE FOR RELAXING AND MEASURING THE LENGTH OF A FABRIC

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20030205

17Q First examination report despatched

Effective date: 20030526

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

AKX Designation fees paid

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040225

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040225

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040225

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: GERMAN

REF Corresponds to:

Ref document number: 59908627

Country of ref document: DE

Date of ref document: 20040401

Kind code of ref document: P

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20040419

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040525

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040525

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2212429

Country of ref document: ES

Kind code of ref document: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040831

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040831

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040831

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20041126

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040725

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20090813

Year of fee payment: 11

Ref country code: NL

Payment date: 20090814

Year of fee payment: 11

Ref country code: LU

Payment date: 20090820

Year of fee payment: 11

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20110301

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100814

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100815

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20120821

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20130726

Year of fee payment: 15

Ref country code: AT

Payment date: 20130813

Year of fee payment: 15

Ref country code: ES

Payment date: 20130829

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20130823

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20130828

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20130823

Year of fee payment: 15

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20130814

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130814

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59908627

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 260151

Country of ref document: AT

Kind code of ref document: T

Effective date: 20140814

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140831

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140814

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59908627

Country of ref document: DE

Effective date: 20150303

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140814

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20150430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150303

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140901

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20150925

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140815