EP0228691B1 - Rolling mill for mechanical pre-de-scaling of steel band - Google Patents

Rolling mill for mechanical pre-de-scaling of steel band Download PDF

Info

Publication number
EP0228691B1
EP0228691B1 EP86117915A EP86117915A EP0228691B1 EP 0228691 B1 EP0228691 B1 EP 0228691B1 EP 86117915 A EP86117915 A EP 86117915A EP 86117915 A EP86117915 A EP 86117915A EP 0228691 B1 EP0228691 B1 EP 0228691B1
Authority
EP
European Patent Office
Prior art keywords
rolls
steel strip
opposite directions
rolling
strip
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
EP86117915A
Other languages
German (de)
French (fr)
Other versions
EP0228691A1 (en
Inventor
Wilfried Bald
Karl-Ernst Boucke
Manfred Fritz
Friedrich Dr. Hollmann
Hans Römmen
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
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 SMS Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT86117915T priority Critical patent/ATE65949T1/en
Publication of EP0228691A1 publication Critical patent/EP0228691A1/en
Application granted granted Critical
Publication of EP0228691B1 publication Critical patent/EP0228691B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B13/00Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/45Scale remover or preventor
    • Y10T29/4517Rolling deformation or deflection
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00Gear cutting, milling, or planing
    • Y10T409/30Milling
    • Y10T409/3042Means to remove scale or raised surface imperfection

Definitions

  • the invention relates to a roll stand for the mechanical pre-descaling of hot-rolled steel strip by reducing rolls according to the push-rolling method.
  • a mechanical pre-descaling by grinding or milling according to DE-PS 886 585 does not allow the profile of the steel strip to be taken into account, so that metal is already removed in the middle if the scale has not yet been removed in the edge regions. Irradiating the surface of the steel strip with abrasive particles and a sludge-water mixture has not proven to be effective, so that here too, undesirable long lengths for a descaling line would be provided, and there is also a risk of damage to the belt surface (DE-PS 29 31 229).
  • DE-AS 12 48 600 proposed a method according to which the strip coming from the rolling mill should pass through a reducing roll stand under the action of strong tensile stresses.
  • the reducing roll stand has to be arranged in front of and behind corresponding roller assemblies which cause tensile forces, so that an undesirably long length is also required for descaling, and the effect achieved was considered inadequate.
  • an increased effectiveness of descaling is to be achieved by carrying out the reduction with simultaneous bending and pushing according to the push-rolling method.
  • a disadvantage here, as well as in the descaling according to DE-PS 29 31 229, is that the respective work rolls are wrapped around half by the incoming or outgoing steel strip, and a consideration of the strip profile is practically not possible, so that with conventional profiles the Steel strips with a slightly reinforced center of the roll gap can only be adapted to one load case of the roll gap by choosing the crowning.
  • the invention has for its object to provide a roll stand, with the help of a mechanical loosening, breaking or removing the scale is made possible without the running of the steel strip in this stand is complicated or it takes longer distances within the rolling line , and this brings about a reduction that can be uniformly adapted to different or changing profiles of steel strips.
  • the profile of the roll gap can be adapted to that of the steel strip, so that the steel strip is rolled out evenly over its entire width and, on the one hand, a uniform tendency to detach the scale layer is achieved while at the same time tension-free steel strip is reached.
  • the strip profile can be determined by detectors, so that the optimal axial displacement of the contoured rollers can be set independently and possibly also by means of a control device External bending forces that can be used to improve the roll gap profile formed can be determined.
  • predetermined further roll gap profiles by means of a preferably arbitrary further axial adjustment in order to thereby achieve corresponding profiles of the rolled steel strip.
  • the tensile stresses occurring in front of and behind the stand in the steel strip can be dimensioned such that no special drive apparatus or at least no rolls wrapped around the strip are required to maintain them, which could cause special problems when the strip runs in.
  • average peripheral speeds of the work rolls will be preferred, which lie between the pure push-rolling operation, in which one of the work rolls rotates at the strip inlet speed and the other at the strip outlet speed, and the usual peripheral speeds of the normal rolling operation, so that a mixed operation between normal rolling and push rollers is present.
  • the medium circumferential speed here denotes the circumferential speed occurring at a medium radius, in order to take into account that there is a special S-shaped bale cut, even if the amplitude of this S contour is only small.
  • the roll stands can be designed as two-roll stands or multi-roll stands, such as in particular four or six-roll stands.
  • the work rolls can be provided with the special grinding that shows S-shaped contours and can be designed to be axially displaceable; in the case of multi-roll stands, it is also possible to equip other rolls, for example intermediate rolls, with such a special grinding, and it is also possible to equip adjacent rolls, for example a work roll and an intermediate roll supporting it, with complementary special grinding.
  • the steel strip 1 schematically shows a cross section through a steel strip 1, both strengths and differences in strength being shown enlarged for better visibility.
  • the steel strip 1 has a symmetrical profile with a reinforced center, as is usually rolled, and which has proven itself with a slight center emphasis, in particular when inserting it into rolling stands.
  • the hot-rolled steel strip 1 is covered by a layer 2 of scale, which is to be removed before the subsequent cold rolling.
  • this steel strip designated 3 is passed between work rolls 4 and 5 of a roll stand, not shown.
  • the bales of these work rolls are provided with a special cut, which has an essentially S-shaped contour, and which is inversely provided for the two work rolls so that their contours complement one another as described, for example, in DE-PS 30 38 865 is.
  • the work rolls 4 and 5 are driven via spindles 6 and 7 by motors 8 and 9, optionally via interposed comb stands, so that they work according to the push-rolling method, more appropriately according to a mixing-push-rolling method:
  • the average peripheral speed of at least one of the work rolls is at the entry speed of the steel strip 3, while the other receives a peripheral speed that at most reaches the exit speed of the steel strip 3.
  • Hydraulic cylinders 12 and 13 act on the free roller journals 10 and 11, which, when acted on in opposite directions, also act in opposite directions Shifts of the work rolls in the direction of arrows 14 and 15 are able to cause.
  • the spindles 6 and 7 causing the drive are expedient for absorbing the displacement, constructed telescopically or through rotatably and axially displaceably comb rollers of a comb rolling stand.
  • Detectors 21 and 22 are directed onto the steel strip 3 both on the inlet side and in the outlet side, which in the illustrated case are designed as optical sensors and are intended to detect the surface of the strip and thus the profile.
  • the control device 23, shown as a block, is supplied with the output signals of the detectors from the left; on the upper side, it is supplied with actual values of the axial displacement, the setting, the setting and bending forces and the peripheral speeds of the work rolls, while the regulation of these values for flat or Tension-free steel strip are shown on the right-hand side: If necessary, the work rolls are expediently shifted in opposite directions by the same amount, and the adjustment as well as the bending forces and the peripheral speeds are set. If necessary, the determination of a specified profile can be initiated manually or by means of an additional medium.
  • the devices for moving the work rolls in opposite directions are expediently additionally provided on the drive side, and the scaffold supporting the work rolls, like the roll bending devices, can be designed in a customary and conventional manner.
  • the invention is not limited to the two-roll stand shown; the small diameter of the work rolls shown rather speaks for a four or six roll stand, although three and five roll stands are also possible. Any of these rollers can have the special bale cut, and the other rollers can be cylindrical or slightly spherical. However, it is also possible, for example, to equip four rolls with expediently differing special cuts in order to provide even further changes in the roll gap by axially displacing the rolls.
  • the breaking up of the scale but in particular the detachment of the scale layer, can be further improved while maintaining the desired profile by arranging two or possibly more of the stands in a row, and a further improvement, if necessary, is also possible by arranging grinding devices in particular.

Abstract

The rolling mill for mechanical descaling of hot rolled steel is constructed according to the slidable roll process with reducing rolls so that a unform operation with different and/or changing shape steel strips can obtained. This is attained when the rolling mill has at least two rolls slidable in opposite directions whose body surfaces are constructed with S-shape contours positioned inversely to each other so that these contours compliment each other flawlessly in one certain axial relative position. When sliding the rolls in opposite directions in one case the contour is decreased in the center region of the steel strip and when slid in the opposite directions in the other case the contour is increased in the center region. Thus the rolls can be adjusted to fit a gently convex steel strip profile by axially sliding the rolls in opposite directions as also rolled strips with a thickness centrally reduced in comparison to that of the edge regions can by appropriate sliding of the rolls opposite each other.

Description

Die Erfindung betrifft ein Walzgerüst zur mechanischen Vorentzunderung von warm gewalztem Stahlband durch Reduzierwalzen nach dem Schubwalzverfahren.The invention relates to a roll stand for the mechanical pre-descaling of hot-rolled steel strip by reducing rolls according to the push-rolling method.

Beim Warmwalzen von Bandstahl bildet sich oberflächlich eine harte Oxyd- bzw. Zunderschicht, die fest an der Metalloberfläche des Bandes haftet. Vor der weicheren Verarbeitung solcher Stahlbänder, insbesondere in einem Kaltwalzwerk, muß die Zunderschicht entfernt werden, um ein Einwalzen des Zunders in das Stahlband und damit Oberflächenmängel desselben zu vermeiden. Gebräuchlich ist es, den Zunder chemisch in einem Beizbad zu entfernen. Übliche Schichtdicken jedoch bedingen lange Reaktions- und damit Durchlaufzeiten, so daß sich unerwünscht große Abmessungen der Bäder ergeben und sowohl die Aufrechterhaltung der gewünschten Badkonzentration als auch die spätere Entsorgung Schwierigkeiten bereiten. Eine mechanische Vorentzunderung durch Schleifen oder Fräsen nach der DE-PS 886 585 erlaubt keine Berücksichtigung des Profiles des Stahlbandes, so daß bereits mittig Metall abgetragen wird, wenn in den Randbereichen der Zunder noch nicht entfernt ist. Das Bestrahlen der Oberfläche des Stahlbandes mit abrasiven Partikeln sowie einem Schlamm-Wasser-Gemisch hat sich nicht wirksam erwiesen, so daß auch hier unerwünscht große Längen für eine Entzunderungsstraße vorzusehen wären, und zusätzlich besteht die Gefahr der Beschädigung der Bandoberfläche (DE-PS 29 31 229). Auf der Suche nach Wegen zu einer problemlosen Entzunderung wurde durch die DE-AS 12 48 600 ein Verfahren vorgeschlagen, nach dem das aus der Walzstraße kommende Band unter Einwirkung starker Zugspannungen ein Reduzierwalzgerüst durchlaufen sollte. Um die gewünschten starken Züge aufbringen zu können, sind jedoch dem Reduzierwalzgerüst entsprechende Zugkräfte bewirkende Rollenanordungen vor- und nachzuordnen, so daß auch hier eine unerwünscht große Länge für die Entzunderung beansprucht wird, und die erzielte Wirkung wurde als unzureichend betrachtet.When hot-rolling strip steel, a hard oxide or scale layer forms on the surface, which adheres firmly to the metal surface of the strip. Before the softer processing of such steel strips, in particular in a cold rolling mill, the scale layer must be removed in order to prevent the scale from rolling into the steel strip and thus to avoid surface defects thereof. It is customary to chemically remove the scale in a pickling bath. However, usual layer thicknesses require long reaction times and thus throughput times, so that undesirably large dimensions of the baths result and both maintaining the desired bath concentration and later disposal pose difficulties. A mechanical pre-descaling by grinding or milling according to DE-PS 886 585 does not allow the profile of the steel strip to be taken into account, so that metal is already removed in the middle if the scale has not yet been removed in the edge regions. Irradiating the surface of the steel strip with abrasive particles and a sludge-water mixture has not proven to be effective, so that here too, undesirable long lengths for a descaling line would be provided, and there is also a risk of damage to the belt surface (DE-PS 29 31 229). In search of ways of problem-free descaling, DE-AS 12 48 600 proposed a method according to which the strip coming from the rolling mill should pass through a reducing roll stand under the action of strong tensile stresses. In order to be able to apply the desired strong pulls, however, the reducing roll stand has to be arranged in front of and behind corresponding roller assemblies which cause tensile forces, so that an undesirably long length is also required for descaling, and the effect achieved was considered inadequate.

Nach der SU-PS 560 657 soll eine erhöhte Wirksamkeit der Entzunderung erreicht werden, indem die Reduktion unter gleichzeitiger Biegung und Schiebung nach dem Schubwalzverfahren durchgeführt wird. Als nachteilig erweist sich hierbei wie auch bei der Entzunderung nach der DE-PS 29 31 229, daß die jeweiligen Arbeitswalzen etwa hälftig vom einlaufenden bzw. auslaufenden Stahlband umschlungen sind, und eine Berücksichtigung des Bandprofiles praktisch nicht möglich ist, so daß bei üblichen Profilen der Stahlbänder mit geringfügig verstärkter Mitte der Walzspalt durch Wahl der Bombierung nur einem Belastungsfall des Walzspaltes anpaßbar ist.According to SU-PS 560 657, an increased effectiveness of descaling is to be achieved by carrying out the reduction with simultaneous bending and pushing according to the push-rolling method. A disadvantage here, as well as in the descaling according to DE-PS 29 31 229, is that the respective work rolls are wrapped around half by the incoming or outgoing steel strip, and a consideration of the strip profile is practically not possible, so that with conventional profiles the Steel strips with a slightly reinforced center of the roll gap can only be adapted to one load case of the roll gap by choosing the crowning.

Die Erfindung geht von der Aufgabe aus, ein Walzgerüst zu schaffen, mit dessen Hilfe eines mechanisches Lockern, Brechen bzw. Entfernen des Zunders ermöglicht wird, ohne daß das Einlaufen des Stahlbandes in dieses Gerüst kompliziert wird oder es längere Strecken innerhalb der Walzlinie in Anspruch nimmt, und das eine Reduktion bewirkt, die sich gleichförmig auch unterschiedlichen bzw. wechselnden Profilen von Stahlbändern anpassen läßt.The invention has for its object to provide a roll stand, with the help of a mechanical loosening, breaking or removing the scale is made possible without the running of the steel strip in this stand is complicated or it takes longer distances within the rolling line , and this brings about a reduction that can be uniformly adapted to different or changing profiles of steel strips.

Gelöst wird diese Aufgabe mit den Merkmalen des Patentanspruches. Durch die Verwendung unterschiedlicher Umfangsgeschwindigkeiten entsprechend dem Schubwalzverfahren lassen sich im Umformungsbereich höhere Scherkräfte und Dehnungen als üblich erreichen, welche eine Aufteilung und Lockerung der Zunderschicht begünstigen. Die hierbei auftretenden Walzkräfte sind verhältnismäßig gering, so daß einerseits das Gerüst entsprechend der verringerten Belastung sich relativ leicht und kompakt ausführen läßt, und andererseits die oft bestehende Tendenz zum Einwalzen von Zunderstücken in die Oberfläche des Stahlbandes behoben wird. Durch gegensinnige axiale Verschiebung der mit S-förmigen Konturen ausgestatteten Walzen läßt sich das Profil des Walzspaltes dem des Stahlbandes anpassen, so daß das Stahlband über seine gesamte Breite hin gleichmäßig ausgewalzt wird und einerseits eine gleichmäßige Tendenz zum Ablösen der Zunderschicht erzielt wird, während gleichzeitig ein spannungsfreies Stahlband erreicht wird. Hierbei läßt sich das Bandprofil durch Detektoren ermitteln, so daß mittels einer Steuervorrichtung die optimale axiale Verschiebung der konturierten Walzen sich selbständig einstellen läßt und gegebenenfalls auch Walzen beanspruchende äußere Biegekräfte zur Verbesserung des gebildeten Walzspaltprofiles bestimmbar sind. Andererseits ist es aber auch möglich, durch eine vorzugsweise willkürliche weitere axiale Verstellung vorgegebene weitere Walzspaltprofile einzustellen, um damit diesen entsprechende Profile des gewalzten Stahlbandes zu erreichen.This object is achieved with the features of the patent claim. By using different peripheral speeds in accordance with the shear rolling method, higher shear forces and elongations than usual can be achieved in the forming area, which favor a division and loosening of the scale layer. The rolling forces that occur are relatively low, so that on the one hand the scaffold can be made relatively light and compact in accordance with the reduced load, and on the other hand the often existing tendency to roll scale pieces into the surface of the steel strip is eliminated. By opposing axial displacement of the rollers equipped with S-shaped contours, the profile of the roll gap can be adapted to that of the steel strip, so that the steel strip is rolled out evenly over its entire width and, on the one hand, a uniform tendency to detach the scale layer is achieved while at the same time tension-free steel strip is reached. Here, the strip profile can be determined by detectors, so that the optimal axial displacement of the contoured rollers can be set independently and possibly also by means of a control device External bending forces that can be used to improve the roll gap profile formed can be determined. On the other hand, however, it is also possible to set predetermined further roll gap profiles by means of a preferably arbitrary further axial adjustment in order to thereby achieve corresponding profiles of the rolled steel strip.

Durch entsprechende Einstellung der mittleren Umfangsgeschwindigkeiten der Arbeitswalzen lassen sich die vor und hinter dem Gerüst im Stahlband auftretenden Zugspannungen so bemessen, daß zu ihrer Aufrechterhaltung keine besonderen Treibapparate oder zumindest keine vom Band umschlungene Rollen erforderlich werden, die beim Einlaufen des Bandes besondere Probleme bewirken könnten. Im allgemeinen wird man mittlere Umfangsgeschwindigkeiten der Arbeitswalzen bevorzugen, die zwischen dem reinen Schubwalzbetrieb, bei dem eine der Arbeitswalzen mit der Bandeinlaufgeschwindigkeit und die andere mit der Bandauslaufgeschwindigkeit umlaufen, und den üblichen Umfangsgeschwindigkeiten des normalen Walzbetriebes liegen, so daß ein Mischbetrieb zwischen normalem Walzen und Schubwalzen vorliegt. Unter mittlerer Umfangsgeschwindigkeit wird hier die bei einem mittleren Radius auftretende Umfangsgeschwindigkeit bezeichnet, um zu berücksichtigen, daß ein spezieller S-förmiger Ballenschliff vorliegt, auch wenn die Amplitude dieser S-Kontur nur gering ist.By adjusting the average peripheral speeds of the work rolls, the tensile stresses occurring in front of and behind the stand in the steel strip can be dimensioned such that no special drive apparatus or at least no rolls wrapped around the strip are required to maintain them, which could cause special problems when the strip runs in. In general, average peripheral speeds of the work rolls will be preferred, which lie between the pure push-rolling operation, in which one of the work rolls rotates at the strip inlet speed and the other at the strip outlet speed, and the usual peripheral speeds of the normal rolling operation, so that a mixed operation between normal rolling and push rollers is present. The medium circumferential speed here denotes the circumferential speed occurring at a medium radius, in order to take into account that there is a special S-shaped bale cut, even if the amplitude of this S contour is only small.

Es hat sich gezeigt, daß auch zwei oder drei derartiger, nach dem Schubwalz- oder dem Misch-Schubwalz-Verfahren arbeitender Gerüste hintereinander vorgesehen und vom Stahlband nacheinander durchlaufen werden können. Das bzw. die Walzgerüste können als Zweiwalzengerüste oder Mehrwalzengerüste wie insbesondere Vier- oder Sechswalzengerüste ausgebildet sein. Zwar können grundsätzlich die Arbeitswalzen mit dem S-förmige Konturen zeigenden Spezialschliff versehen und axial verschiebbar ausgebildet sein; bei Mehrwalzengerüsten ist es aber auch möglich, andere Walzen, bspw. Zwischenwalzen, mit einem solchen Spezialschliff auszustatten, und es ist auch möglich, benachbarte Walzen, wie bspw. eine Arbeits- und eine diese abstützende Zwischenwalze, mit sich ergänzendem Spezialschliff auszustatten. Des weiteren ist es möglich, bei Mehrwalzengerüsten zwei unterschiedlich geformte Spezialschliffe vorzusehen und die sie aufweisenden Walzen axial zu verschieben.It has been shown that two or three such stands working according to the push-roll or the mixed push-roll method can also be provided in series and can be passed through one after the other by the steel strip. That or the roll stands can be designed as two-roll stands or multi-roll stands, such as in particular four or six-roll stands. In principle, the work rolls can be provided with the special grinding that shows S-shaped contours and can be designed to be axially displaceable; in the case of multi-roll stands, it is also possible to equip other rolls, for example intermediate rolls, with such a special grinding, and it is also possible to equip adjacent rolls, for example a work roll and an intermediate roll supporting it, with complementary special grinding. Furthermore, it is possible to provide two differently shaped special grindings in the case of multi-roll stands and to axially shift the rolls having them.

Im einzelnen sind die Merkmale der Erfindung anhand der folgenden Beschreibung eines Walzgerüstes in Verbindung mit dieses darstellenden Zeichnungen erläutert. Es zeigen hierbei:

Fig. 1
schematisch einen Schnitt durch ein Stahlband, und
Fig. 2
schematisch Arbeitswalzen eines Gerüstes mit ihnen zugeordneten Stell- und Steuervorrichtungen.
The features of the invention are explained in more detail with reference to the following description of a roll stand in conjunction with the drawings which illustrate the same. They show:
Fig. 1
schematically a section through a steel strip, and
Fig. 2
schematically work rolls of a scaffold with actuating and control devices assigned to them.

In der Fig. 1 ist schematisch ein Querschnitt durch ein Stahlband 1 gezeigt, wobei zur besseren Erkennbarkeit sowohl Stärken als auch Stärkenunterschiede vergrößert aufgezeigt sind. Das Stahlband 1 weist ein symmetrisches Profil mit verstärkter Mitte auf, wie es üblicherweise gewalzt wird, und das sich mit einer leichten Mittenbetonung insbesondere beim Einführen in Walzgerüste bewährt hat. Das warm gewalzte Stahlband 1 ist von einer Schicht 2 von Zunder überzogen, die vor dem folgenden Kaltwalzen zu entfernen ist.1 schematically shows a cross section through a steel strip 1, both strengths and differences in strength being shown enlarged for better visibility. The steel strip 1 has a symmetrical profile with a reinforced center, as is usually rolled, and which has proven itself with a slight center emphasis, in particular when inserting it into rolling stands. The hot-rolled steel strip 1 is covered by a layer 2 of scale, which is to be removed before the subsequent cold rolling.

In Fig. 2 wird dieses Stahlband, mit 3 bezeichnet, zwischen Arbeitswalzen 4 und 5 eines nicht dargestellten Walzgerüstes hindurchgeführt. Die Ballen dieser Arbeitswalzen sind mit einem Spezialschliff versehen, der eine im wesentlichen S-förmige Kontur aufweist, und der für die beiden Arbeitswalzen invers so vorgesehen ist, daß deren Konturen sich lückenlos ergänzen, wie es beispielsweise in der DE-PS 30 38 865 beschrieben ist.In Fig. 2, this steel strip, designated 3, is passed between work rolls 4 and 5 of a roll stand, not shown. The bales of these work rolls are provided with a special cut, which has an essentially S-shaped contour, and which is inversely provided for the two work rolls so that their contours complement one another as described, for example, in DE-PS 30 38 865 is.

Die Arbeitswalzen 4 und 5 werden über Spindeln 6 und 7 durch Motore 8 und 9, gegebenenfalls über zwischengeschaltete Kammgerüste, so angetrieben, daß sie nach dem Schubwalzverfahren, zweckmäßiger nach einem Misch-Schubwalzverfahren, arbeiten: Hierbei liegt die mittlere Umfangsgeschwindigkeit einer der Arbeitswalzen mindestens bei der Einlaufgeschwindigkeit des Stahlbandes 3, während die andere eine Umfangsgeschwindigkeit erhält, die höchstens die Austrittsgeschwindigkeit des Stahlbandes 3 erreicht. Diese Geschwindigkeitsrelationen können durch motorischen Betrieb eines der Motore und generatorischem Betrieb des anderen bewirkt werden; es ist aber auch möglich, mechanische Zwischengetriebe vorzusehen, die als Differentialgetriebe ausgebildet sein können.The work rolls 4 and 5 are driven via spindles 6 and 7 by motors 8 and 9, optionally via interposed comb stands, so that they work according to the push-rolling method, more appropriately according to a mixing-push-rolling method: Here, the average peripheral speed of at least one of the work rolls is at the entry speed of the steel strip 3, while the other receives a peripheral speed that at most reaches the exit speed of the steel strip 3. These speed relations can be brought about by motor operation of one of the motors and generator operation by the other; but it is also possible to provide mechanical intermediate gears, which can be designed as differential gears.

An die freien Walzenzapfen 10 und 11 greifen Hydraulikzylinder 12 und 13 an, welche, gegensinnig beaufschlagt, auch gegensinnige Verschiebungen der Arbeitswalzen in Richtung der Pfeile 14 und 15 zu bewirken vermögen. Die den Antrieb bewirkenden Spindeln 6 bzw. 7 sind zweckmäßig, um die Verschiebung aufzunehmen, teleskopartig aufgebaut oder durchgreifen drehfest und axial verschiebbar Kammwalzen eines Kammwalzgerüstes.Hydraulic cylinders 12 and 13 act on the free roller journals 10 and 11, which, when acted on in opposite directions, also act in opposite directions Shifts of the work rolls in the direction of arrows 14 and 15 are able to cause. The spindles 6 and 7 causing the drive are expedient for absorbing the displacement, constructed telescopically or through rotatably and axially displaceably comb rollers of a comb rolling stand.

Ebenso wie die Ständer nicht dargestellt sind, sind es auch die Anstellvorrichtungen, welche durch Pfeile 16 und 17 dargestellte Anstellkräfte der Arbeitswalzen 4 und 5 bewirken. Weiterhin greifen an die Walzenzapfen respektive an die ebenfalls nicht dargestellten, diese abstützenden Einbaustücke Biegekräfte an, die durch Pfeile 18 - 20 dargestellt sind, und die positiv und negativ gerichtet sein können.Just as the stands are not shown, it is also the adjusting devices which bring about the adjusting forces of the work rolls 4 and 5 shown by arrows 16 and 17. Furthermore, bending forces act on the roller journals or on the chocks which are also not shown and which support these, which are represented by arrows 18-20 and which can be directed positively and negatively.

Auf das Stahlband 3 sind sowohl auf der Einlauf- als auch in der Auslaufseite Detektoren 21 und 22 gerichtet, welche im dargestellten Fall als optische Sensoren ausgebildet sind und die Bandoberfläche und damit das Profil erfassen sollen. Der als Block dargestellten Steuervorrichtung 23 werden von links die Ausgangssignale der Detektoren zugeführt, auf der oberen Seite werden sie Istwerte der axialen Verschiebung, der Einstellung, der Anstell- und Biegekräfte sowie der Umfangsgeschwindigkeiten der Arbeitswalzen zugeführt, während die Regelung dieser Werte für planes bzw. spannungsfreies Stahlband auf der rechten Seite dargestellt sind: Im Bedarfsfalle werden die Arbeitswalzen zweckmäßig gegensinnig um gleiche Beträge verschoben, und es werden sowohl die Anstellung als auch die Biegekräfte sowie die Umfangsgeschwindigkeiten eingestellt. Im Bedarfsfalle kann durch einen zusätzlichen Eingriff manuell oder durch Datenträger die Bestimmung eines vorgegebenen Profiles eingeleitet werden.Detectors 21 and 22 are directed onto the steel strip 3 both on the inlet side and in the outlet side, which in the illustrated case are designed as optical sensors and are intended to detect the surface of the strip and thus the profile. The control device 23, shown as a block, is supplied with the output signals of the detectors from the left; on the upper side, it is supplied with actual values of the axial displacement, the setting, the setting and bending forces and the peripheral speeds of the work rolls, while the regulation of these values for flat or Tension-free steel strip are shown on the right-hand side: If necessary, the work rolls are expediently shifted in opposite directions by the same amount, and the adjustment as well as the bending forces and the peripheral speeds are set. If necessary, the determination of a specified profile can be initiated manually or by means of an additional medium.

Die in der Zeichnung gemachten Angaben dienen nur der Verdeutlichung. So werden zweckmäßig die Vorrichtungen zum gegensinnigen Verschieben der Arbeitswalzen zusätzlich auf der Antriebsseite vorgesehen, und das die Arbeitswalzen stützende Gerüst kann, wie auch die Walzenbiegevorrichtungen, in üblicher und herkömmlicher Weise ausgelegt werden. Ebenso ist die Erfindung nicht auf das dargestellte Zweiwalzengerüst beschränkt; der gezeigte geringe Durchmesser der Arbeitswalzen spricht vielmehr für ein Vier- oder Sechswalzengerüst, obwohl auch Dreiund Fünfwalzengerüste möglich sind. Hierbei können beliebige dieser Walzen den Spezialballenschliff aufweisen, und die anderen Walzen können zylindrisch oder schwachballig ausgeführt sein. Es ist aber auch möglich, beispielsweise vier Walzen mit zweckmäßog sich dann unterscheidenden Spezialschliffen auszustatten, um noch weitergehende Änderungen des Walzspaltes durch Axialverschiebung der Walzen vorzusehen.The information given in the drawing is for illustration purposes only. Thus, the devices for moving the work rolls in opposite directions are expediently additionally provided on the drive side, and the scaffold supporting the work rolls, like the roll bending devices, can be designed in a customary and conventional manner. Likewise, the invention is not limited to the two-roll stand shown; the small diameter of the work rolls shown rather speaks for a four or six roll stand, although three and five roll stands are also possible. Any of these rollers can have the special bale cut, and the other rollers can be cylindrical or slightly spherical. However, it is also possible, for example, to equip four rolls with expediently differing special cuts in order to provide even further changes in the roll gap by axially displacing the rolls.

In jedem Falle wird durch das Schubwalzen, besser MischSchubwalzen, unter Reduktion des gewalzten Stahlbandes um zweckmäßig mindestens 4% durch die Streckvorgänge in Verbindung mit der reduzierten Walzkraft mindestens ein Aufreißen, im wesentlichen jedoch ein Ablösen der Zunderschicht bewirkt, so daß folgende Beizbäder nicht der Stärke der ursprünglichen Zunderschicht anzupassen sind, sondern wesentlich kürzer ausgeführt werden können, da nur noch geringe, verbliebene Zunderreste zu entfernen sind. Damit wird aber auch die Gefahr des Überbeizens bereits freiliegender Metallflächen ebenso gemindert wie die Regeneration der Beizflüssigkeit und die Entsorgung überschüssiger Flüssigkeit erleichtert werden. Da die Walzen im gestreckten Lauf entlang der Walzlinie vom Stahlband durchsetzt werden, ergeben sich auch beim Lauf des Stahlbandes keine Schwierigkeiten und insbesondere das Einlaufen bzw. der Anstich werden stark vereinfacht.In any case, by pushing, better mixing-pushing, reduction of the rolled steel strip by at least 4% by means of the stretching processes in connection with the reduced rolling force, at least one tearing open, but essentially a detachment of the scale layer, so that the following pickling baths do not have the thickness the original scale layer must be adapted, but can be made much shorter, since only small, remaining scale residues are to be removed. However, this also reduces the risk of over-pickling of already exposed metal surfaces, as well as facilitating the regeneration of the pickling liquid and the disposal of excess liquid. Since the rolls are penetrated by the steel strip in the stretched run along the rolling line, there are no difficulties even when the steel strip runs, and in particular the running-in or tapping is greatly simplified.

Das Aufbrechen des Zunders, insbesondere aber die Ablösung der Zunderschicht kann unter Beibehaltung des angestrebten Profiles weiter verbessert werden, indem zwei oder gegebenenfalls mehrere der Gerüste hintereinander angeordnet sind, und eine gegebenenfalls weitere Verbesserung ist auch durch das Nachordnen von insbesondere Schleifvorrichtungen möglich.The breaking up of the scale, but in particular the detachment of the scale layer, can be further improved while maintaining the desired profile by arranging two or possibly more of the stands in a row, and a further improvement, if necessary, is also possible by arranging grinding devices in particular.

Claims (1)

  1. Roll stand for the preliminary mechanical descaling of hot-rolled steel strip by reduction rolling according to the shear rolling method, in which the working rolls display mean circumferential speeds one differing from the other, characterised thereby, that the roll stand displays at least two mutually complementary rolls (4, 5), which are axially displaceable in opposite sense and the barrel surfaces of which are executed inversely with S-shaped outlines in such a manner that these outlines augment each other gaplessly in a certain axial setting of the rolls one relative to the other, that the steel strip (3) runs through the working rolls stretched flat and without looping around the same and that the stand is associated with a control device (23), which sets the axial displacement of the rolls (4, 5) equipped with S-shaped outlines as well as the external bending forces (16 to 20) acting on the rolls in dependence on the scanning result of detectors (21, 22), which detect the strip profile, in such a manner that a stress-free steel strip (3) or a steel strip of preset profile is effected and that the control device (23) determines the reduction of the steel strip and also the rolling force as well as the circumferential speeds of the working rolls.
EP86117915A 1986-01-07 1986-12-22 Rolling mill for mechanical pre-de-scaling of steel band Expired - Lifetime EP0228691B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117915T ATE65949T1 (en) 1986-01-07 1986-12-22 ROLLER FOR MECHANICAL PRE-DESCALE OF STEEL STRIP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3600143 1986-01-07
DE19863600143 DE3600143A1 (en) 1986-01-07 1986-01-07 ROLLING DEVICES FOR MECHANICAL PRE-SCALING OF STEEL STRIP

Publications (2)

Publication Number Publication Date
EP0228691A1 EP0228691A1 (en) 1987-07-15
EP0228691B1 true EP0228691B1 (en) 1991-08-07

Family

ID=6291432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117915A Expired - Lifetime EP0228691B1 (en) 1986-01-07 1986-12-22 Rolling mill for mechanical pre-de-scaling of steel band

Country Status (6)

Country Link
US (1) US4831854A (en)
EP (1) EP0228691B1 (en)
JP (1) JPS62158519A (en)
CN (1) CN87100084A (en)
AT (1) ATE65949T1 (en)
DE (2) DE3600143A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3634367A1 (en) * 1986-10-09 1988-04-21 Schloemann Siemag Ag ROLLER ARRANGEMENT FOR DEFORM-FREE TREATMENT OF MOVING TAPE-SHAPED PRODUCTS
US4979556A (en) * 1989-04-04 1990-12-25 Hunter Engineering Company, Inc. Thickness control for a continuous caster
US6065319A (en) 1996-09-11 2000-05-23 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Rolling mill with laterally different velocities
DE19961351C1 (en) * 1999-12-17 2001-10-11 Sundwig Gmbh Method and device for joining the ends of metal strips by means of resistance welding
US6439883B1 (en) 2000-04-11 2002-08-27 Ajax Magnethermic Corporation Threading and scale removal device
CN102581046A (en) * 2012-02-06 2012-07-18 生田(苏州)精密机械有限公司 Moving mechanism of brush of dry brushing machine

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2012849A (en) * 1933-03-08 1935-08-27 United Eng Foundry Co Descaling and edging apparatus
DE886585C (en) * 1941-11-04 1953-08-17 Administration Sequestre Des R Descaling device for workpieces
GB748196A (en) * 1952-11-05 1956-04-25 Chem Fab Budenheim Ag Apparatus for removing scale or rust from wire, metal strip or like elongated metal
DE1248600B (en) * 1957-07-27 1967-08-31 United States Steel Corp Method and device for mechanical pre-descaling of steel strip
US4162627A (en) * 1972-07-17 1979-07-31 Hitachi, Ltd. Rolling mill
SU560657A1 (en) * 1975-05-26 1977-06-05 Предприятие П/Я Г-4586 The method of cleaning metal strip from scale
SU716662A1 (en) * 1978-05-04 1980-02-28 Днепропетровский Металлургический Институт Method of removing scale off strip surface
JPS5829171B2 (en) * 1978-09-05 1983-06-21 石川島播磨重工業株式会社 Descaling method for hot rolled steel strip
SU816600A1 (en) * 1979-06-07 1981-03-30 Магнитогорский Дважды Орденаленина И Ордена Трудового Kpac-Ного Знамени Металлургическийкомбинат Им. B.И.Ленина Method of removing scale
JPS56119609A (en) * 1980-02-28 1981-09-19 Nippon Kokan Kk <Nkk> Differential rolling mill
US4519233A (en) * 1980-10-15 1985-05-28 Sms Schloemann-Siemag Ag Roll stand with noncylindrical rolls
SU1093379A2 (en) * 1983-03-21 1984-05-23 Днепропетровский Металлургический Институт Им.Л.И.Брежнева Method of descaling strip surface
JPS603912A (en) * 1983-06-20 1985-01-10 Nippon Steel Corp Method for removing scale of surface layer of hot rolled sheet
US4656859A (en) * 1985-08-21 1987-04-14 Wean United, Inc. Rolling mill stand employing variable crown rolls and associated method

Also Published As

Publication number Publication date
EP0228691A1 (en) 1987-07-15
JPS62158519A (en) 1987-07-14
CN87100084A (en) 1987-08-12
DE3600143A1 (en) 1987-07-09
ATE65949T1 (en) 1991-08-15
DE3680776D1 (en) 1991-09-12
US4831854A (en) 1989-05-23

Similar Documents

Publication Publication Date Title
EP0230644B1 (en) Arrangement for de-scaling hot-rolled steel bands
DE19518144C2 (en) Process for producing hot strip and combined continuous casting and hot rolling plant
EP0266564B1 (en) Strip casting installation with a following multiple stand continuous rolling mill
EP0061441B1 (en) Apparatus for the hot rolling of striplike or tabular rolling stock
DE2206912A1 (en) Roll stand
DE2950473C2 (en)
DD207666A5 (en) PLANT FOR HOT ROLLING OF BELT OR TABLE FROZEN ROLLING
DE3234160A1 (en) METHOD AND WARMBAND STREET FOR PRODUCING THIN METAL STRIP, ESPECIALLY METAL BROADBAND, FROM WARM STRIP
DE4041206C2 (en) Process and plant for the production of hot-rolled steel strip, in particular for stainless steels from continuously cast primary material
EP0228691B1 (en) Rolling mill for mechanical pre-de-scaling of steel band
DE10102821A1 (en) Rolling mill used for producing planar strips comprises working rollers and support rollers axially arranged in a roll stand
DE4009861C2 (en) Process for the production of hot-rolled bar material such as fine steel or wire and plant for carrying out the process
DE4009860C2 (en) Process and plant for the production of hot-rolled steel strip, in particular for stainless steels, from strip-shaped continuous material
EP0560093B1 (en) Small section-/wire rod mill
DE2517536A1 (en) STRETCH-REDUCING MILL
EP0560115B1 (en) Method and rolling mill for precision rolling wire or stock having a circular cross-section
EP0914878B1 (en) Process and treatment line for producing metal strips having descaled surfaces
DE1934302B2 (en) Method and device for hot rolling metal slabs
DE2931229C2 (en) Process for mechanical pre-descaling of hot-rolled steel strip
EP1414596A2 (en) Hot rolling installation
DE3203581A1 (en) METHOD AND DEVICE FOR PRODUCING METAL STRIP FROM WARM STRIP, ESPECIALLY WARM BROAD STRIP
DE4417274A1 (en) Temper rolling various steel qualities in same mill stand
DE605439C (en) Process for cold machining of workpieces with a circular cross-section by straightening, rounding, smoothing and polishing in the helical rolling mill
DE3126974A1 (en) &#34;ROLLING METHOD AND ROLLING MILL&#34;
EP0870554B1 (en) Rolling train for rolling flat steel

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

17P Request for examination filed

Effective date: 19870120

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE FR GB IT

17Q First examination report despatched

Effective date: 19890314

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE FR GB IT

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

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19910807

Ref country code: GB

Effective date: 19910807

Ref country code: BE

Effective date: 19910807

REF Corresponds to:

Ref document number: 65949

Country of ref document: AT

Date of ref document: 19910815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3680776

Country of ref document: DE

Date of ref document: 19910912

EN Fr: translation not filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19911227

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

Ref country code: AT

Effective date: 19911231

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no 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
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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

Ref country code: DE

Payment date: 19990217

Year of fee payment: 13

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: 20001003