EP0470512B1 - Method of dressing metal bands passing through - Google Patents
Method of dressing metal bands passing through Download PDFInfo
- Publication number
- EP0470512B1 EP0470512B1 EP91112996A EP91112996A EP0470512B1 EP 0470512 B1 EP0470512 B1 EP 0470512B1 EP 91112996 A EP91112996 A EP 91112996A EP 91112996 A EP91112996 A EP 91112996A EP 0470512 B1 EP0470512 B1 EP 0470512B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tensile
- strip
- bending
- stressing
- stretching
- 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.)
- Revoked
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/05—Stretching combined with rolling
Definitions
- Metal strips the thickness of which has been reduced to less than 5 mm by repeated rolling, are not flat. They are wavy and have bumps. For this reason, they are often not suitable for further processing. Therefore, such tapes are subjected to a straightening process.
- straightening and stretch-bending straightening.
- the strip is subjected to a tensile stress at which its yield strength is exceeded, so that the strip is plastically deformed, namely elongated.
- stretch bending straightening the strip is subjected to tensile stress and bent several times in opposite directions under tension. The yield stress in the area of the mutual bending is also exceeded and the strip is permanently elongated.
- the desired lengthening of the tape thus takes place on the contact sheet of the tensioning rollers, namely immediately before the point of deceleration of the braking roller or immediately after the point of impact of the pulling roller, because the tension introduced into the tape is higher at these points than in the actual train path, since here the a tensile stress generated by the tensioning rollers is superimposed on a bending tension which is dependent on the roller diameter, that is to say is added to this.
- tensioning rollers of this type practically always have a rubber coating, a defect that does not correspond to the internal tension of the strip to be straightened is generated by imperfections in the rubber coating, different layer thicknesses and uneven wear of the coating and changing rubber coating properties in the strip. The result is a tape that has significant residual stresses and thus flatness errors due to the large number of imponderables shown.
- the object of the invention is to develop a method which avoids the disadvantages mentioned above and with which not only a flat belt can be produced, but also a permanent flatness is achieved due to the treatment of the belt.
- This object is achieved procedurally in that the metal strip is subjected to tensile bending twice in one pass with different tensile stress, in that the bending deformation in the first tensile bending process is greater than in the second tensile bending process and in that the tensile stress in the second tensile bending process is at least 50% of the stretching limit stress of the strip and is substantially larger than the tensile stress during the first stretch bending process.
- the invention involves two tensile bending under different conditions. It has been shown that under the different tensile bending conditions during the first and second tensile bending processes, the band leaving the second tensile bending section is absolutely flat and not because of it the curvature awarded in the prior art has tensile bending treatment. This effect is due to the fact that in the second tension bending process the desired plastic deformation of the strip using the usual means for bending, such as roller straighteners with small radii of curvature of the straightening rollers, can be carried out much more precisely than in a pure stretching stretch. It is surprising that in this way not only the desired flatness of the tape is maintained, but this flatness is also maintained permanently.
- the strip should preferably be lengthened differently in the two tension bending sections, in particular in the first tension bending section being stretched more than in the second tension bending section.
- the device has two tensile bending sections 2-5 arranged one behind the other in the direction of travel of a strip B to be straightened.
- the belt B arrives via a pair of S-rollers 1, 1 'in the first tension bending section 2 and via a further driven S-pair of rollers 4.4' in the second tension bending section 5 and from here via a third driven S-roller pair 7,7 'to a reel, not shown.
- the drives of the S-roller pairs 1.1 ', 4.4', 7.7 ' are tension-controlled or degree of stretch-regulated.
- a roller straightening apparatus 3, 6, whose straightening rollers, which have a small radius of curvature, bend the continuous strip B several times in the opposite direction, is arranged in each train bending section 2, 5.
- the band B is subjected to a strong bending deformation and a weak tensile stress in the first tensile bending section 2 and a strong tensile stress and a weak bending deformation in the second tensile bending section 5.
- the tensile stress is 20 to 50% and in the second tensile bending section 5, 50 to 90% of the yield stress of the strip B.
- a bending stress is superimposed on the tension by adjusting the straightening rollers of the bending straighteners 3.6 , which leads to the desired elongation of the band. So that the tension can be set independently of one another in both tension bending sections 2.5, the pair of S-rollers 4, 4 'is driven and therefore has a decoupling effect on both tension bending sections 2.5.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Metal Rolling (AREA)
Description
Metallbänder, deren Dicke durch mehrmaliges Walzen auf unter 5 mm vermindert worden ist, sind nicht eben. Sie sind wellig und haben Beulen. Aus diesem Grunde sind sie häufig für die Weiterverarbeitung nicht geeignet. Deshalb werden solche Bänder einem Richtverfahren unterworfen. Beim Richten wird unterschieden zwischen einem Zugrecken und einem Streckbiegerichten. Beim Zugrecken wird das Band einer Zugspannung unterworfen, bei der dessen Streckgrenzspannung überschritten wird, so daß das Band plastisch verformt, und zwar gelängt wird. Beim Streckbiegerichten wird das Band einer Zugspannung unterworfen und unter Zug mehrfach gegensinnig gebogen. Dabei wird ebenfalls die Streckgrenzspannung im Bereich der wechselseitigen Biegung überschritten und das Band bleibend gelängt. Schließlich ist es auch bekannt, das Zugrecken und das Streckbiegerichten miteinander zu kombinieren, indem zunächst streckbiegegerichtet und danach zuggereckt wird. Das Zugrecken wird bei diesem Stand der Technik jedenfalls dann für erforderlich gehalten, wenn beim Streckbiegerichten mit einem Streckgrad > 1 % gearbeitet wird, weil dann angeblich aufgrund verbleibender Restspannungen im Band Wölbungen entstehen, die durch das nachfolgende reine Zugrecken im plastischen Bereich wieder beseitigt werden sollen (DE 35 25 343 C1). In der Praxis befriedigen die verschiedenen Richtverfahren, sei es das reine Zugrecken, sei es das Streckbiegerichten, sei es das kombinierte Streckbiegerichten und Zugrecken, nicht nur deshalb, weil das Band nach der Behandlung nicht befriedigend plan ist, sondern vor allem weil nach längerer Auslagerzeit sich wieder Unplanheiten einstellen.Metal strips, the thickness of which has been reduced to less than 5 mm by repeated rolling, are not flat. They are wavy and have bumps. For this reason, they are often not suitable for further processing. Therefore, such tapes are subjected to a straightening process. A distinction is made between straightening and stretch-bending straightening. During tensile stretching, the strip is subjected to a tensile stress at which its yield strength is exceeded, so that the strip is plastically deformed, namely elongated. During stretch bending straightening, the strip is subjected to tensile stress and bent several times in opposite directions under tension. The yield stress in the area of the mutual bending is also exceeded and the strip is permanently elongated. Finally, it is also known to combine tensile stretching and stretch bending straightening by first stretch stretching straightening and then is stretched. In this state of the art, tensile stretching is considered to be necessary in any case if a stretching degree of> 1% is used in the straightening bending straightening, because it is then allegedly due to remaining residual stresses in the strip that bulges arise which are to be eliminated again by the subsequent pure tensile stretching in the plastic area (DE 35 25 343 C1). In practice, the various straightening processes are satisfactory, whether it is pure stretch stretching, stretch bending straightening or combined stretch stretching straightening and stretch stretching, not only because the strip is not satisfactorily flat after the treatment, but above all because after a longer aging period again adjust the flatness.
Hinzu kommt, daß beim reinen Zugrecken und beim kombinierten Streckrichten und Zugrecken in der reinen Zugstrecke keine definierte Bandreckung über die Bandbreite gewährleistet werden kann. Da das Band zwischen zwei Spanntrommeln unter Zug gesetzt wird, kann nicht ohne weiteres gesagt werden, in welchem Bereich der Zugstrecke die Bandreckung (Längung) erfolgt. Definiert man die Zugstrecke als den Abstand der Mittelpunkte der beiden Spannrollen, so wird die erwünschte Bandlängung in diesem Bereich nicht auftreten, vielmehr muß davon ausgegangen werden, daß die Dehnungszone unmittelbar vor beziehungsweise hinter dem Scheitelpunkt der beiden Spannrollen liegt. Die gewünschte Bandlängung findet damit auf dem Kontaktbogen der Spannrollen und zwar unmittelbar vor dem Ablaufpunkt der bremsenden Rolle oder unmittelbar nach dem Auflaufpunkt der ziehenden Rolle statt, weil die in das Band eingebrachte Spannung an diesen Stellen höher ist als in der eigentlichen Zugstrecke, da hier der durch die Spannrollen erzeugten Zugspannung sich eine vom Rollendurchmesser abhängige Biegespannung überlagert, das heißt, zu dieser addiert.In addition, in the case of pure stretching and combined stretching and stretching in the pure stretch of train, no defined stretching of the strip can be guaranteed over the strip width. Since the belt is put under tension between two tensioning drums, it cannot be said without further ado in which area of the train path the belt stretching (elongation) takes place. If you define the distance as the distance between the centers of the two tensioning rollers, the desired belt elongation will not occur in this area, rather it must be assumed that the stretch zone is immediately in front of or behind the apex of the two tensioning rollers. The desired lengthening of the tape thus takes place on the contact sheet of the tensioning rollers, namely immediately before the point of deceleration of the braking roller or immediately after the point of impact of the pulling roller, because the tension introduced into the tape is higher at these points than in the actual train path, since here the a tensile stress generated by the tensioning rollers is superimposed on a bending tension which is dependent on the roller diameter, that is to say is added to this.
Die Bandverlängerung auf dem Umfang von Spannrollen weist erhebliche Nachteile auf. Da derartige Spannrollen praktisch immer einen Gummiüberzug haben, wird durch Formfehler der Gummierung, unterschiedliche Schichtstärken sowie ungleichmäßigen Verschleiß der Beschichtung und sich verändernde Gummierungseigenschaften im Band ein Spannungsbild erzeugt, das nicht dem inneren Spannungsbild des zu richtenden Bandes entspricht. Im Ergebnis entsteht ein Band, das wegen der Vielzahl der aufgezeigten Unwägbarkeiten deutliche Restspannungen und damit Planheitsfehler aufweist.The belt extension on the circumference of tensioning rollers has considerable disadvantages. Since tensioning rollers of this type practically always have a rubber coating, a defect that does not correspond to the internal tension of the strip to be straightened is generated by imperfections in the rubber coating, different layer thicknesses and uneven wear of the coating and changing rubber coating properties in the strip. The result is a tape that has significant residual stresses and thus flatness errors due to the large number of imponderables shown.
Aufgabe der Erfindung ist es, ein Verfahren zu entwickeln, welches die obengenannten Nachteile vermeidet und mit dem nicht nur ein planes Band hergestellt werden kann, sondern auch aufgrund der Behandlung des Bandes eine dauerhafte Planheit erzielt wird.The object of the invention is to develop a method which avoids the disadvantages mentioned above and with which not only a flat belt can be produced, but also a permanent flatness is achieved due to the treatment of the belt.
Diese Aufgabe wird verfahrensmäßig dadurch gelöst, daß das Metallband in einem Durchlauf zweimal mit unterschiedlicher Zugspannung zugbiegegerichtet wird, indem die Biegeverformung beim ersten Zugbiegevorgang größer als beim zweiten Zugbiegevorgang ist und indem die Zugspannung beim zweiten Zugbiegevorgang mindestens 50 % der Streckbiegegrenzspannung des Bandes beträgt und wesentlich größer als die Zugspannung beim ersten Streckbiegevorgang ist.This object is achieved procedurally in that the metal strip is subjected to tensile bending twice in one pass with different tensile stress, in that the bending deformation in the first tensile bending process is greater than in the second tensile bending process and in that the tensile stress in the second tensile bending process is at least 50% of the stretching limit stress of the strip and is substantially larger than the tensile stress during the first stretch bending process.
Bei der Erfindung wird in direktem Gegensatz zum Stand der Technik, bei dem zunächst zugbiegegereckt und anschließend nur zuggereckt wird, zweimal zugbiegegereckt unter verschiedenen Bedingungen. Es hat sich gezeigt, daß unter den verschiedenen Zugbiegebedingungen beim ersten und zweiten Zugbiegevorgang das die zweite Zugbiegestrecke verlassende Band absolut plan ist und nicht die ihm wegen der Zugbiegebehandlung im Stand der Technik zugesprochenen Wölbungen aufweist. Dieser Effekt ist darauf zurückzuführen, daß beim zweiten Zugbiegevorgang die gewünschte plastische Verformung des Bandes mit den gebräuchlichen Mitteln für die Biegung, wie Rollenrichtapparate mit kleinen Krümmungsradien der Richtrollen, wesentlich präziser als in einer reinen Zugreckstrecke durchführbar ist. Überraschend ist, daß auf diese Art und Weise nicht nur die gewünschte Planheit des Bandes erhalten wird, sondern diese Planheit auch dauerhaft erhalten bleibt.In direct contrast to the prior art, in which the tension is first stretched and then only stretched, the invention involves two tensile bending under different conditions. It has been shown that under the different tensile bending conditions during the first and second tensile bending processes, the band leaving the second tensile bending section is absolutely flat and not because of it the curvature awarded in the prior art has tensile bending treatment. This effect is due to the fact that in the second tension bending process the desired plastic deformation of the strip using the usual means for bending, such as roller straighteners with small radii of curvature of the straightening rollers, can be carried out much more precisely than in a pure stretching stretch. It is surprising that in this way not only the desired flatness of the tape is maintained, but this flatness is also maintained permanently.
Gute Erfahrungen hinsichtlich der Planheit und der Konservierung der Planheit hat man mit einer Zugspannung beim ersten Streckbiegevorgang von 20 % bis 50 % der Streckgrenzspannung des Bandes und/oder mit einer Zugspannung beim zweiten Streckbiegevorgang von etwa 80 % - 90 % der Grenzspannung des Bandes gemacht.Good experiences with regard to the flatness and the preservation of the flatness have been made with a tensile stress during the first stretch bending process of 20% to 50% of the yield stress of the band and / or with a tensile stress during the second stretch bending process of approximately 80% - 90% of the limit stress of the band.
Vorzugsweise sollte das Band in den beiden Zugbiegestrecken unterschiedlich gelängt werden, insbesondere in der ersten Zugbiegestrecke stärker als in der zweiten Zugbiegestrecke gelängt werden.The strip should preferably be lengthened differently in the two tension bending sections, in particular in the first tension bending section being stretched more than in the second tension bending section.
Im folgenden wird die Erfindung anhand einer ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert, die eine Vorrichtung zum Richten von Metallbändern im Durchlauf in schematischer Darstellung in Seitenansicht zeigt.In the following, the invention is explained in more detail with reference to a drawing illustrating an exemplary embodiment, which shows a device for straightening metal strips in a pass in a schematic representation in a side view.
Die Vorrichtung weist zwei in Durchlaufrichtung eines zu richtenden Bandes B hintereinander angeordnete Zugbiegestrecken 2-5 auf. Das Band B gelangt über ein S-Rollenpaar 1,1' in die erste Zugbiegestrecke 2 und über ein weiteres angetriebenes S-Rollenpaar 4,4' in die zweite Zugbiegestrecke 5 und von hier über ein drittes angetriebenes S-Rollenpaar 7,7' zu einer nicht dargestellten Aufwickelhaspel. Die Antriebe der S-Rollenpaare 1,1',4,4',7,7' sind zugspannungsgeregelt oder streckgradgeregelt. In jeder Zugbiegestrecke 2,5 ist ein Rollenrichtapparat 3,6 angeordnet, deren einen kleinen Krümmungsradius aufweisende Richtrollen das durchlaufende Band B mehrmals entgegengesetzt biegen.The device has two tensile bending sections 2-5 arranged one behind the other in the direction of travel of a strip B to be straightened. The belt B arrives via a pair of S-rollers 1, 1 'in the first
Bei der gezeigten Vorrichtung wird das Band B in der ersten Zugbiegestrecke 2 einer starken Biegeverformung und einer schwachen Zugspannung und in der zweiten Zugbiegestrecke 5 einer starken Zugspannung und einer schwachen Biegeverformung unterworfen. In der ersten Zugbiegestrecke liegt die Zugspannung bei 20 bis 50 % und in der zweiten Zugbiegestrecke 5 bei 50 bis 90 % der Streckgrenzspannung des Bandes B. In Abhängigkeit von der eingestellten Zugspannung wird durch Einstellung der Richtrollen der Biegerichtapparate 3,6 der Zugspannung eine Biegespannung überlagert, die zu der gewünschten Längung des Bandes führt. Damit in beiden Zugbiegestrecken 2,5 die Zugspannung unabhängig voneinander eingestellt werden kann, ist das S-Rollenpaar 4,4' angetrieben und wirkt deshalb zugspannungsentkoppelnd auf beide Zugbiegestrecken 2,5.In the device shown, the band B is subjected to a strong bending deformation and a weak tensile stress in the first
Claims (5)
- A process for levelling continuously moving metal strips exclusively by tensile rolling levelling, characterized in that in one pass the metal strip (B) is subjected to tensile rolling twice with different tensile stressing, the bending deformation in the first tensile rolling operation being greater than in the second tensile rolling operation, and the tensile stressing in the second tensile rolling operation being at least 50% of the yield point stressing of the strip and greater than the tensile stressing during the first tensile rolling operation.
- A process according to claim 1, characterized in that the tensile stressing in the first stretching-and-rolling operation is 20 to 50% of the yield point stressing of the strip.
- A process according to claims 1 or 2, characterized in that in the second stretching-and-rolling operation the tensile stressing is lower than 90% of the yield point stressing of the strip.
- A process according to one of claims 1 to 3, characterized in that the strip (B) is bent in the same direction at the start and end of a tensile rolling distance.
- A process according to one of claims 1 to 4, characterized in that the strip is curved in opposite directions at the start and end of a tensile rolling distance, more particularly the second tensile rolling distance.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4024794 | 1990-08-04 | ||
| DE4024794A DE4024794C2 (en) | 1990-08-04 | 1990-08-04 | Process for straightening metal strips |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0470512A2 EP0470512A2 (en) | 1992-02-12 |
| EP0470512A3 EP0470512A3 (en) | 1992-04-08 |
| EP0470512B1 true EP0470512B1 (en) | 1993-12-15 |
Family
ID=6411656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91112996A Revoked EP0470512B1 (en) | 1990-08-04 | 1991-08-02 | Method of dressing metal bands passing through |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5161400A (en) |
| EP (1) | EP0470512B1 (en) |
| JP (1) | JPH04262823A (en) |
| DE (2) | DE4024794C2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4124800C2 (en) * | 1991-07-26 | 1994-06-23 | Bwg Bergwerk Walzwerk | Process for treating metal strips |
| WO1997034715A1 (en) * | 1996-03-18 | 1997-09-25 | Nippon Steel Corporation | Cold tandem rolling method and cold tandem rolling mill |
| JP3590288B2 (en) * | 1999-02-15 | 2004-11-17 | 住友重機械工業株式会社 | Strip plate leveling method and leveling device |
| JP2001347318A (en) * | 2000-06-08 | 2001-12-18 | Mitsubishi Heavy Ind Ltd | Device and method for adjusting plate width |
| JP4562152B2 (en) * | 2000-07-11 | 2010-10-13 | キヤノン株式会社 | Substrate processing method |
| DE102016121448B4 (en) | 2016-11-09 | 2018-08-30 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and device for stretch bending of a metal strip |
| CN116921498B (en) * | 2023-09-18 | 2024-01-09 | 新乡巴山航空材料有限公司 | Radial device of rolling up suitable for level high mesh number wire mesh grid |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1219967A (en) * | 1968-04-30 | 1971-01-20 | Head Wrightson & Co Ltd | Improvements in the processing of strip metal |
| DE2350503B1 (en) * | 1973-10-08 | 1975-01-23 | Bwg Bergwerk Walzwerk | Method and device for descaling and leveling sheet metal strips |
| DE3525343C1 (en) * | 1985-04-20 | 1986-12-11 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg | Method and apparatus for the continuous levelling of metal strips |
| GB2174027B (en) * | 1985-04-20 | 1988-07-13 | Bwg Bergwerk Walzwerk | Process and equipment for continuous flattening of particularly thin metal strip |
| FR2617744B1 (en) * | 1987-07-08 | 1994-05-20 | Clecim | METHOD AND INSTALLATION FOR FLOORING A METAL STRIP |
-
1990
- 1990-08-04 DE DE4024794A patent/DE4024794C2/en not_active Expired - Lifetime
-
1991
- 1991-08-01 US US07/738,838 patent/US5161400A/en not_active Expired - Fee Related
- 1991-08-02 DE DE91112996T patent/DE59100726D1/en not_active Revoked
- 1991-08-02 EP EP91112996A patent/EP0470512B1/en not_active Revoked
- 1991-08-05 JP JP3282344A patent/JPH04262823A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US5161400A (en) | 1992-11-10 |
| DE59100726D1 (en) | 1994-01-27 |
| DE4024794A1 (en) | 1992-02-06 |
| DE4024794C2 (en) | 1993-11-25 |
| JPH04262823A (en) | 1992-09-18 |
| EP0470512A3 (en) | 1992-04-08 |
| EP0470512A2 (en) | 1992-02-12 |
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