EP0988904B1 - Method and device for measuring the flatness of strips - Google Patents
Method and device for measuring the flatness of strips Download PDFInfo
- 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
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- European Patent Office
- Prior art keywords
- strip
- measuring
- braking force
- measuring region
- flatness
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- 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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Control Of Metal Rolling (AREA)
Abstract
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
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.
- 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
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
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
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
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
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
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
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
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-
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
Claims (12)
- 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. - 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).
- 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).
- 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).
- 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).
- 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.
- 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.
- 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). - 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.
- 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).
- 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).
- 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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843899 | 1998-09-24 | ||
DE19843899A DE19843899C1 (en) | 1998-09-24 | 1998-09-24 | Method and device for measuring flatness of strips |
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)
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 |
ATE270424T1 (en) * | 1999-05-28 | 2004-07-15 | Ims Messsysteme Gmbh | METHOD FOR DETERMINING THE FLATNESS OF A STRIP 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)
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 |
-
1998
- 1998-09-24 DE DE19843899A patent/DE19843899C1/en not_active Expired - Fee Related
-
1999
- 1999-08-14 EP EP99116003A patent/EP0988904B1/en not_active Expired - Lifetime
- 1999-08-14 AT AT99116003T patent/ATE260151T1/en active
- 1999-08-14 ES ES99116003T patent/ES2212429T3/en not_active Expired - Lifetime
- 1999-08-14 DE DE59908627T patent/DE59908627D1/en not_active Expired - Lifetime
- 1999-09-10 ZA ZA9905849A patent/ZA995849B/en unknown
- 1999-09-23 US US09/404,492 patent/US6164104A/en not_active Expired - Fee Related
- 1999-09-23 CA CA002283192A patent/CA2283192C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0988904A2 (en) | 2000-03-29 |
CA2283192A1 (en) | 2000-03-24 |
EP0988904A3 (en) | 2003-01-22 |
CA2283192C (en) | 2003-12-30 |
DE19843899C1 (en) | 2000-05-04 |
US6164104A (en) | 2000-12-26 |
ATE260151T1 (en) | 2004-03-15 |
ZA995849B (en) | 2000-04-04 |
DE59908627D1 (en) | 2004-04-01 |
ES2212429T3 (en) | 2004-07-16 |
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