EP0230644A1 - Arrangement for de-scaling hot-rolled steel bands - Google Patents

Arrangement for de-scaling hot-rolled steel bands Download PDF

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Publication number
EP0230644A1
EP0230644A1 EP86117916A EP86117916A EP0230644A1 EP 0230644 A1 EP0230644 A1 EP 0230644A1 EP 86117916 A EP86117916 A EP 86117916A EP 86117916 A EP86117916 A EP 86117916A EP 0230644 A1 EP0230644 A1 EP 0230644A1
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EP
European Patent Office
Prior art keywords
grinding
steel strip
grinding rollers
arrangement according
rolls
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.)
Granted
Application number
EP86117916A
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German (de)
French (fr)
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EP0230644B1 (en
Inventor
Wilfried Bald
Karl-Ernst Boucke
Hans Römmen
Manfred Fritz
Friedrich Dr. Hollmann
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SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
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Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT86117916T priority Critical patent/ATE47058T1/en
Publication of EP0230644A1 publication Critical patent/EP0230644A1/en
Application granted granted Critical
Publication of EP0230644B1 publication Critical patent/EP0230644B1/en
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    • 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 an arrangement for removing scale from hot-rolled steel strips by grinding or milling, in particular before the same is introduced into a pickle.
  • Hot-rolled steel strip has a superficial, firmly adhering scale layer which must be removed in a cold rolling mill before further reduction, since it would otherwise be rolled into the surface of the strip steel and cause defects, in particular surface defects thereof.
  • the scale layer is usually removed by pickling in a pickling bath.
  • thick layers of scale require relatively long treatment times, so that the baths that are passed through disadvantageously have large dimensions; The necessary regeneration of the bath liquid and the disposal of the bath liquid that has been used have also proven to be disadvantageous. Attempts have therefore been made to loosen or break the scale layer by rolling in special stands in order to offer the bath liquid more favorable attachment areas and to partially remove scale layers before the bath is reached.
  • the invention has for its object to provide an arrangement of the type referred to, which enables effective and uniform grinding or milling of the scale layer of a hot-rolled steel strip with relatively little effort.
  • FIG. 1 shows a cross section through a hot-rolled steel strip 1, the profile curvatures of which are shown for illustration purposes.
  • the steel strip 1 has a layer 2 of scale on all sides. If this scale layer is to be removed by grinding or milling, it is necessary to take into account the contours of the profile of the steel strip; If this is not done and, for example, a simple, straight milling cutter is used, the cutting edges pull through the curvature as a chord, and not only is the scale layer removed, but an area 3 of the metal itself, so that the steel strip undergoes a profile change on the one hand and on the other hand, the workload is unreasonably high, since not only the scale, but at least in the middle areas also substantial metal parts are processed, which also result in a disadvantageous loss.
  • FIG. 2 an arrangement for grinding or milling a scale layer of a hot-rolled steel strip 4 is shown schematically.
  • grinding rollers 5 and 6 are provided, the bales of which are not, as usual, cylindrical or slightly cambered, but which are provided with a special grinding which gives slightly S-shaped contours.
  • the strength relationships are exaggerated to illustrate them and make them recognizable in the drawing. While the grinding roller 5, starting from the collar beginning shown on the drive side, initially increases in diameter and only passes through a minimum of the diameter in the second half, the diameter of the grinding roller 6 initially decreases and then increases to a maximum in the second half; the S-shaped contours run inversely.
  • the drive-side roller journals of the grinding rollers 5 and 6 are connected to drive motors 8 via spindles 7; since the grinding rollers are held axially displaceable, the spindles 7 are constructed telescopically, for example, to accommodate the displacement.
  • the bearing is symbolically illustrated on the operator-side roll neck 9 of the grinding roll 7.
  • An adjusting device 10 which is shown as a hydraulic cylinder for illustrative purposes, first acts on the bearing or chock supporting the roll neck, and a bending cylinder 11, which bends moments and, acts on the same roll pin or the bearing or chock surrounding it so that it can cause a certain deflection of the grinding roller 5. Furthermore, the piston of a displacement cylinder 12 is coupled to the roll neck 9.
  • this displacement cylinder 12 is additionally provided on the drive side.
  • the arrangement shown was chosen for the sake of a clear representation in the drawing, and for the same reasons corresponding arrangements of the grinding roller 6 are shown as little as the drive-side adjusting device and the drive-side bending cylinder of the grinding roller 5.
  • a detector 13 is provided above the steel strip 4, which allows the profile shape of the steel strip 4 to be recognized.
  • the steel strip 4 is passed between the grinding rollers 6 and 14 and 15, respectively, and these are guided against the steel strip 4 with appropriate pressure.
  • the profile shape of the steel strip 4 is determined by means of the detector 13 and specified to a control device 16.
  • the control device is also given the respective actual values of both the stroke and / or the force exerted by the adjusting device 10 as well as the actual values of the axial displacement of the grinding roller 5 and the bending force exerted by the bending cylinder 11. Based on these predetermined values, the control device 16 adjusts both the setting and the bending forces, but in particular the axial opposite displacement of the grinding rollers of a pair of rollers, for example the grinding rollers 5 and 6, in such a way that the gap formed between the grinding rollers of the profile shape of the steel strip 4 corresponds.
  • the grinding rollers can be equipped with an appropriate surface texture.
  • the determination of the profile shape of the steel strip 4 for specification to the control device 16 can be replaced by manual input or input by means of data carriers or can also be supported. There is also the possibility, for example, of using thickness gauges distributed over the bandwidth. In the case of superficial, for example optical scanning, this can be supplemented by scanning the underside. However, it is also possible to provide an optical scanning which reacts to light-dark values in such a way that it is able to distinguish the remaining scale and bare metal that has already been reached and, in this case, arrange them after the grinding roller arrangements in order to ensure the uniformity of the control the grinding effect achieved and, if necessary, correct the grinding effect by changing the profile of the gap formed.

Abstract

An apparatus is provided for removing scale from a hot rolled steel strip by rolls acting by grinding and/or milling so that these rolls are uniformly effective in all regions of the steel strip and an appropriate uniform removal of the scale layer occurs. This is attained when driven grinding rolls adjustable toward the surfaces of the steel strip are provided of which at least two opposing rolls are axially slidable in opposite directions and have inversely oriented S-shape contours. These contours complement each other completely flawlessly in one definite position of the grinding rolls. In one such position the rolls provide a uniform engagement on both sides of a steel strip with a nearly rectangular profile. In fact the rolls by appropriate axial sliding and application of bending forces if necessary may be adjusted to fit the actual profile of the steel strip so that a uniform engagement on the scale layer is guaranteed and a locally excessive grinding and/or milling in the central region of the steel strip is avoided.

Description

Die Erfindung betrifft eine Anordnung zum Entfernen von Zunder von warmgewalzten Stahlbändern durch Schleifen bzw. Fräsen, insbesondere vor dem Einbringen derselben in eine Beize.The invention relates to an arrangement for removing scale from hot-rolled steel strips by grinding or milling, in particular before the same is introduced into a pickle.

Warmgewalztes Stahlband weist eine oberflächliche, fest haf­tende Zunderschicht auf, die vor dem weiteren Reduzieren in einem Kaltwalzwerk entfernt werden muß, da sie sonst in die Oberfläche des Bandstahls eingewalzt wird und Fehlerstellen, insbesondere Oberflächenfehler desselben bewirkt. Üblicher­weise wird die Zunderschicht durch Beizen in einem Beizbad entfernt. Insbesondere starke Zunderschichten erfordern je­doch relativ lange Behandlungszeiten, so daß die durchlaufe­nen Bäder unvorteilhaft große Abmessungen einnehmen; als un­vorteilhaft erweist sich weiterhin das erforderliche Regene­rieren der Badflüssigkeit sowie der Entsorgung ausgebrachter Badflüssigkeit. Man hat daher versucht, die Zunderschicht durch Walzen in besonderen Gerüsten zu lockern bzw. zu bre­chen, um der Badflüssigkeit günstigere Ansatzflächen zu bie­ten, und um Zunderschichten bereits teilweise vor Ereichen des Bades zu entfernen.Hot-rolled steel strip has a superficial, firmly adhering scale layer which must be removed in a cold rolling mill before further reduction, since it would otherwise be rolled into the surface of the strip steel and cause defects, in particular surface defects thereof. The scale layer is usually removed by pickling in a pickling bath. In particular, thick layers of scale, however, require relatively long treatment times, so that the baths that are passed through disadvantageously have large dimensions; The necessary regeneration of the bath liquid and the disposal of the bath liquid that has been used have also proven to be disadvantageous. Attempts have therefore been made to loosen or break the scale layer by rolling in special stands in order to offer the bath liquid more favorable attachment areas and to partially remove scale layers before the bath is reached.

Es ist bereits versucht worden, Zunderschichten durch Band­schleifen zu entfernen. Trotz mehrfacher Bandumlenkung jedoch erweist sich ein solches Schleifen nicht als ausreichend, und es bereitet auch Schwierigkeiten, die für ein wirksames Schlei­fen erforderlichen Anpreßkräfte aufzubringen. Eine wirkungs­volle Abstützung der Schleifbänder jedoch ergibt keine groß­ flächige Auflage, so daß die Zunderschicht im wesentlichen nur in bestimmten Breitenbereichen angegriffen wird.Attempts have been made to remove scale layers by belt grinding. Despite multiple belt deflections, however, such grinding does not prove to be sufficient, and it also creates difficulties in applying the contact forces required for effective grinding. However, effective support of the sanding belts does not result in large flat support, so that the scale layer is attacked essentially only in certain width ranges.

In der DE-AS 10 09 584 wird empfohlen, ein zu entzunderndes Stahlband unter sowohl auf der Ein- als auch auf der Auslauf­seite aufgebrachten starken Zugkräften zwischen Biegewalzen hindurchzuführen; es hat sich jedoch die Entzunderungswirkung nicht als ausreichend erwiesen, und als nachteilig zeigte sich die durch das Biegen bewirkte Kaltverfestigung. Auch ein Re­duzierwalzen nach der US-PS 2 650 888 oder der DE-PS 28 08 299 hat sich nicht bewährt, da bei einem solchen Walzen ergibt sich infolge der aufzubringenden hohen Zugkräfte die Notwendig­keit zusätzlicher, vom Stahlband umschlossener Treibwalzen und damit sowohl ein erhöhter Aufwand als auch ein gesteigerter Platzbedarf, und es ist kaum möglich, der Profilform des Stahl­bandes so Rechnung zu tragen, daß am Ausgang ein spannungsfreies Walzband erzielt wird.In DE-AS 10 09 584 it is recommended that a steel strip to be descaled be passed between bending rollers under strong tensile forces applied to both the inlet and the outlet side; however, the descaling effect has not been found to be sufficient, and the work hardening caused by bending has been found to be disadvantageous. Even a reducing roller according to US Pat. No. 2,650,888 or DE-PS 28 08 299 has not proven itself, since with such rolling, the high tensile forces to be applied result in the need for additional drive rollers enclosed by the steel strip, and thus both an increased effort as well as an increased space requirement, and it is hardly possible to take the profile shape of the steel strip into account in such a way that a tension-free rolled strip is obtained at the exit.

Nach der DE-PS 886 585 wird empfohlen, das Stahlband zwischen einem Walzenpaar mit aufgerauhter Fläche hindurchzuführen, des­sen Walzen mit unterschiedlichen Umfangsgeschwindigkeiten so betrieben werden, daß zwar die Richtung der Umfangsgeschwindig­keiten der beiden an den beiden Seiten des Stahlbandes an die­sem anliegenden Ballenbereichen in untereinander gleichen Rich­tungen und gleichgerichtet mit der Laufgeschwindigkeit des Stahlbandes verlaufen, die eine aber relativ schneller umläuft als das Stahlband vorläuft, während die andere entsprechend langsamer ist. Hierdurch soll eine schleifende Abnahme der Zunderschicht erfolgen, die bei entsprechender Auslegung einer als Oberflächentextur vorgesehenen Riffelung auch fräserartig erfolgen kann. Auch hier ist es nicht möglich, die spezielle Form des Profiles des bearbeiteten Stahlbandes zu berücksich­tigen, so daß in stärkeren Bereichen des Stahlbandes bereits Metall abgearbeitet wird, während in schwächeren Bereichen die Zunderschicht kaum bzw. praktisch nicht angegriffen wird.According to DE-PS 886 585, it is recommended to pass the steel strip between a pair of rollers with a roughened surface, the rollers of which are operated at different peripheral speeds such that the direction of the peripheral speeds of the two on the two sides of the steel strip on the adjacent bale areas are identical to one another Directions and run in the same direction with the running speed of the steel belt, which rotates relatively faster than the steel belt runs, while the other is correspondingly slower. This is intended to result in a grinding removal of the scale layer, which can also be carried out in the manner of a milling cutter if the corrugation provided as the surface texture is designed accordingly. Again, it is not possible to take into account the special shape of the profile of the processed steel strip, so that metal is already being worked in thicker areas of the steel strip, while in weaker areas the scale layer is hardly or practically not attacked.

Die Erfindung geht von der Aufgabe aus, eine Anordnung der bezeichneten Gattung zu schaffen, welche ein wirkungsvolles und gleichförmiges Abschleifen bzw. -fräsen der Zunderschicht eines warmgewalzten Stahlbandes bei relativ geringem Aufwande ermöglicht.The invention has for its object to provide an arrangement of the type referred to, which enables effective and uniform grinding or milling of the scale layer of a hot-rolled steel strip with relatively little effort.

Gelöst wird diese Aufgabe durch die im Patentanspruch 1 ge­kennzeichneten Maßnahmen. Durch die Verwendung von gegensinnig axial verschieblichen Schleifwalzen in Verbindung mit einem Konturenschliff, wie er bspw. aus der DE-PS 30 38 865 bekannt ist, läßt sich die Form des von den Schleifwalzen eingeschlos­senen Spaltes dem Profil des jeweils zu entzundernden Stahl­bandes derart anpassen, daß ein gleichmäßiger Angriff an die gesamte Oberfläche des Stahlbandes ermöglicht ist und damit auch eine gleichförmige Entfernung gesichert wird.This object is achieved by the measures characterized in claim 1. By using oppositely axially displaceable grinding rollers in connection with a contour grinding, as is known for example from DE-PS 30 38 865, the shape of the gap enclosed by the grinding rollers can be adapted to the profile of the steel strip to be descaled in such a way that a uniform attack on the entire surface of the steel strip is made possible and thus a uniform removal is ensured.

Zweckmäßige und vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Useful and advantageous developments of the invention are characterized in the subclaims.

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

  • Figur 1 überhöht ein mögliches Profil eines Stahlbandes mit der Andeutung der mit üblichen Fräsern erzielbaren Wirkung, und
  • Figur 2 schematisch zwei jeweils zwei Schleifwalzen aufwei­sende Anordnungen.
The features of the invention are explained in detail on the basis of the following description of an exemplary embodiment in conjunction with the drawings which illustrate the same. They show:
  • Figure 1 exaggerates a possible profile of a steel strip with the indication of the effect that can be achieved with conventional cutters, and
  • Figure 2 shows schematically two arrangements each having two grinding rollers.

In der Fig. 1 ist ein Querschnitt durch ein warmgewalztes Stahlband 1 gezeigt, dessen Profilwölbungen zur Veranschau­lichung verstärkt dargestellt sind. Das Stahlband 1 weist allseitig eine Schicht 2 von Zunder auf. Soll diese Zunder­schicht durch Schleifen oder Fräsen entfernt werden, ist es erforderlich, die Konturen des Profils des Stahlbandes zu berücksichtigen; erfolgt dieses nicht und wird bspw. ein einfacher, gerade verlaufender Fräser verwendet, so durch­ziehen dessen Schneiden die Wölbung als Sehne, und es wird nicht nur die Zunderschicht entfernt, sondern ein Bereich 3 des Metalles selbst, so daß das Stahlband einerseits eine Profilveränderung erfährt und andererseits der Arbeitsaufwand unangemessen hoch ist, da ja nicht nur der Zunder, sondern zumindest in den mittleren Bereichen auch erhebliche Metall­anteile abgearbeitet werden, die sich darüber hinaus nachtei­lig als Verlust ergeben.FIG. 1 shows a cross section through a hot-rolled steel strip 1, the profile curvatures of which are shown for illustration purposes. The steel strip 1 has a layer 2 of scale on all sides. If this scale layer is to be removed by grinding or milling, it is necessary to take into account the contours of the profile of the steel strip; If this is not done and, for example, a simple, straight milling cutter is used, the cutting edges pull through the curvature as a chord, and not only is the scale layer removed, but an area 3 of the metal itself, so that the steel strip undergoes a profile change on the one hand and on the other hand, the workload is unreasonably high, since not only the scale, but at least in the middle areas also substantial metal parts are processed, which also result in a disadvantageous loss.

In Fig. 2 ist eine Anordnung zum Beschleifen oder Abfräsen einer Zunderschicht eines warmgewalzten Stahlbandes 4 schema­tisch dargestellt. Oberhalb und unterhalb des Stahlbandes 4 sind Schleifwalzen 5 bzw. 6 vorgesehen, deren Ballen nicht, wie üblich, zylindrisch oder leicht bombiert ausgeführt sind, sondern die mit einem Spezialschliff versehen sind, der leicht S-förmige Konturen ergibt. Auch hier sind die Stärkenverhält­nisse übertrieben dargestellt, um sie zu veranschaulichen und in der Zeichnung erkennbar zu machen. Während die Schleif­walze 5, ausgehend vom antriebsseitig dargestellten Bundan­fang, im Durchmesser zunächst ansteigt und erst in der zwei­ten Hälfte ein Minimum des Durchmessers durchläuft, nimmt der Durchmesser der Schleifwalze 6 zunächst ab und erhöht sich dann in der zweiten Hälfte zu einem Maximum; die S-­förmigen Konturen verlaufen damit invers.In Fig. 2, an arrangement for grinding or milling a scale layer of a hot-rolled steel strip 4 is shown schematically. Above and below the steel belt 4, grinding rollers 5 and 6 are provided, the bales of which are not, as usual, cylindrical or slightly cambered, but which are provided with a special grinding which gives slightly S-shaped contours. Here too, the strength relationships are exaggerated to illustrate them and make them recognizable in the drawing. While the grinding roller 5, starting from the collar beginning shown on the drive side, initially increases in diameter and only passes through a minimum of the diameter in the second half, the diameter of the grinding roller 6 initially decreases and then increases to a maximum in the second half; the S-shaped contours run inversely.

Die durch sie erzielte Wirkung ist bspw. in der DE-PS 30 38 865 ausführlich erläutert: In der mittleren, der symmetrischen Stellung der beiden Arbeitswalzen ergibt sich ein lückenloses Aneinanderschließen der Konturen, und beim Auseinanderfahren der Schleifwalzen ergibt sich zwischen Ihnen ein äquidistanter Spalt.The effect achieved by them is explained in detail, for example, in DE-PS 30 38 865: in the middle, the symmetrical position of the two work rolls, there is a gapless closing of the contours, and when the grinding rolls move apart, there is an equidistant gap between them.

Die antriebsseitigen Walzenzapfen der Schleifwalzen 5 und 6 sind über Spindeln 7 mit Antriebsmotoren 8 verbunden; da die Schleifwalzen axial verschiebbar gehalten sind, sind zur Aufnahme der Verschiebung die Spindeln 7 bspw. teles­kopartig aufgebaut. Anhand des bedienungsseitigen Walzen­zapfens 9 der Schleifwalze 7 ist symbolisch die Lagerung veranschaulicht. An das den Walzenzapfen tragende Lager bzw. Einbaustück greift zunächst eine Anstellvorrichtung 10 an, die zur Veranschaulichung als Hydraulikzylinder aufgezeigt ist, und in axialer Distanz greift an den gleichen Walzen­zapfen bzw. das diesen umschließende Lager bzw. Einbaustück ein Biegezylinder 11 an, der Biegemomente und damit eine ge­wisse Durchbiegung der Schleifwalze 5 zu bewirken vermag. Des weiteren ist mit dem Walzenzapfen 9 der Kolben eines Verschie­bezylinders 12 gekuppelt. In der Praxis jedoch wird man, um den Schleifwalzenaustausch zu vereinfachen, diesen Verschiebe­zylinder 12 zusätzlich auf der Antriebsseite vorsehen. Die aufgezeigte Anordnung wurde aus Gründen einer übersichtlichen Darstellung in der Zeichnung gewählt, und aus den gleichen Gründen sind entsprechende Anordnungen der Schleifwalze 6 eben­sowenig dargestellt wie die antriebsseitige Anstellvorrichtung und der antriebsseitige Biegezylinder der Schleifwalze 5.The drive-side roller journals of the grinding rollers 5 and 6 are connected to drive motors 8 via spindles 7; since the grinding rollers are held axially displaceable, the spindles 7 are constructed telescopically, for example, to accommodate the displacement. The bearing is symbolically illustrated on the operator-side roll neck 9 of the grinding roll 7. An adjusting device 10, which is shown as a hydraulic cylinder for illustrative purposes, first acts on the bearing or chock supporting the roll neck, and a bending cylinder 11, which bends moments and, acts on the same roll pin or the bearing or chock surrounding it so that it can cause a certain deflection of the grinding roller 5. Furthermore, the piston of a displacement cylinder 12 is coupled to the roll neck 9. In practice, however, in order to simplify the replacement of the grinding rollers, this displacement cylinder 12 is additionally provided on the drive side. The arrangement shown was chosen for the sake of a clear representation in the drawing, and for the same reasons corresponding arrangements of the grinding roller 6 are shown as little as the drive-side adjusting device and the drive-side bending cylinder of the grinding roller 5.

Oberhalb des Stahlbandes 4 ist ein Detektor 13 vorgesehen, welches es gestattet, die Profilform des Stahlbandes 4 zu er­kennen.A detector 13 is provided above the steel strip 4, which allows the profile shape of the steel strip 4 to be recognized.

Da in vielen Fällen und insbesondere bei starker Verzunderung ein Schleifwalzenpaar nicht ausreicht, sind dem Schleifwalzen­p-ar 5 und 6 weitere Schleifwalzenpaare, im Ausführungsbeispiel das Paar der Schleifwalzen 14 und 15, nachgeschaltet.Since in many cases and especially in the case of severe scaling, one pair of grinding rollers is not sufficient, 5 and 6 further pairs of grinding rollers, in the exemplary embodiment the pair of grinding rollers 14 and 15, are connected downstream of the pair of grinding rollers.

Im Betriebe wird das Stahlband 4 zwischen den Schleifwalzen und 6 bzw. 14 und 15 hindurchgeführt, und diese werden mit entsprechendem Andruck gegen das Stahlband 4 geführt.In operation, the steel strip 4 is passed between the grinding rollers 6 and 14 and 15, respectively, and these are guided against the steel strip 4 with appropriate pressure.

Um eine gleichmäßige Entzunderung zu erhalten, wird mittels des Detektors 13 die Profilform des Stahlbandes 4 ermittelt und einer Steuervorrichtung 16 vorgegeben. Der Steuervorrich­tung werden weiterhin die jeweiligen Istwerte sowohl des Hubes und/oder der ausgeübten Kraft der Anstellvorrichtung 10 eben­so vorgegeben wie die Ist-Werte der axialen Verschiebung der Schleifwalze 5 sowie der durch den Biegezylinder 11 ausgeübten Biegekraft. Aufgrund dieser vorgegebenen Werte stellt die Steuervorrichtung 16 eine sowohl die Anstellung als auch die Biegekräfte, insbesondere aber die axiale gegensinnige Ver­schiebung der Schleifwalzen eines Walzenpaare, bspw. der SChleifwalzen 5 und 6, derart ein, daß der zwischen den Schleifwalzen gebildete Spalt der Profilform des Stahlbandes 4 entspricht. Damit aber wird dessen Oberfläche gleichmäßig von den Schleifwalzen 5 und 6 erfaßt, und damit wird auch die Zun­derschicht praktisch gleichmäßig abgetragen. Zur Erzielung der Schleifwirkung können die Schleifwalzen mit einer entspre­chenden Oberflächentextur ausgestattet sein. Es hat sich aber auch bewährt, gegebenenfalls zusätzliche, den Schleifwalzen ein entsprechend abrasives Schleifmittel zuzuführen. Des wei­teren ist es auch möglich, die Schleifwalzen mit entsprechen­den Kanten oder Kanten aufweisenden Klingen auszustatten, wel­che ein Abarbeiten der Zunderschicht nach dem Fräserprinzip gestatten.In order to obtain a uniform descaling, the profile shape of the steel strip 4 is determined by means of the detector 13 and specified to a control device 16. The control device is also given the respective actual values of both the stroke and / or the force exerted by the adjusting device 10 as well as the actual values of the axial displacement of the grinding roller 5 and the bending force exerted by the bending cylinder 11. Based on these predetermined values, the control device 16 adjusts both the setting and the bending forces, but in particular the axial opposite displacement of the grinding rollers of a pair of rollers, for example the grinding rollers 5 and 6, in such a way that the gap formed between the grinding rollers of the profile shape of the steel strip 4 corresponds. But this means that its surface is evenly gripped by the grinding rollers 5 and 6, and thus the scale layer is also removed practically uniformly. To achieve the grinding effect, the grinding rollers can be equipped with an appropriate surface texture. However, it has also proven useful, if appropriate, to supply the grinding rollers with a correspondingly abrasive abrasive. Furthermore, it is also possible to equip the grinding rollers with corresponding edges or with blades which allow the scale layer to be worked off according to the milling cutter principle.

In jedem dieser Fälle hat es sich bewährt, daß durch axiale gegensinnige Verschiebung der mit dem Spezialschliff versehenen Schleifwalzen deren Berührungslinien mit dem Stahlband dessen Profil angepaßt sind. Eine noch weitergehende Anpassung kann durch das zusätzliche Aufbringen von Biegekräften und damit durch eine zusätzliche Durchbiegung der Walzen bewirkt werden, wobei die Biegemomente mit Hilfe der Abstützung durch die An­stellvorrichtungen erzielt werden können; es ist aber auch möglich, zusätzlich die Schleifwalzen mindestens innerhalb einer Längenzone abstützende Stützwalzen vorzusehen, deren Umfangsgeschwindigkeit der der Schleifwalzen entspricht.In each of these cases, it has been found that by axially opposing displacement of the grinding rollers provided with the special grinding, their contact lines with the steel belt are adapted to its profile. A still further adjustment can be brought about by the additional application of bending forces and thus by additional bending of the rollers, the bending moments being able to be achieved with the aid of the adjustment devices; however, it is also possible to additionally provide support rollers supporting the grinding rollers at least within a length zone, the peripheral speed of which corresponds to that of the grinding rollers.

Die Ermittlung der Profilform des Stahlbandes 4 zur Vor­gabe an die Steuervorrichtung 16 kann durch eine manuelle Eingabe oder eine Eingabe vermittels von Datenträgern er­setzt oder aber auch unterstützt werden. Es besteht darüber hinaus die Möglichkeit, bspw. über die Bandbreite verteilt angeordnete Dickenmesser zu verwenden. Bei einer oberfläch­lichen, bspw. optischen Abtastung kann diese durch eine Ab­tastung der Unterseite ergänzt werden. Es ist aber auch mög­lich, eine optische Abtastung vorzusehen, die auf Hell-Dunkel-­Werte so reagiert, daß sie in der Lage ist, verbliebenen Zun­der und schon erreichtes blankes Metall zu unterscheiden und diese in diesem Falle den Schleifwalzenanordnungen nachzuord­nen, um die Gleichmäßigkeit der erzielten Schleifwirkung zu kontrollieren und im Bedarfsfalle die Schleifwirkung durch Profiländerungen des gebildeten Spaltes zu korrigieren. Be­währt hat es sich auch, die Anordnung zum Schleifen bzw. Frä­sen einem nach dem Schubwalzverfahren arbeitenden, Zunder brechen­den bzw. lockernden Gerüst nachzuordnen. In allen diesen Fäl­len wird durch eine weitgehende und gleichmäßige Abarbeitung des Zunders eine erhebliche Entlastung nachgeordneter Bäder erzielt, so daß diese mit geringeren Verweilzeiten arbeiten und in geringeren Längen ausgeführt sein können.The determination of the profile shape of the steel strip 4 for specification to the control device 16 can be replaced by manual input or input by means of data carriers or can also be supported. There is also the possibility, for example, of using thickness gauges distributed over the bandwidth. In the case of superficial, for example optical scanning, this can be supplemented by scanning the underside. However, it is also possible to provide an optical scanning which reacts to light-dark values in such a way that it is able to distinguish the remaining scale and bare metal that has already been reached and, in this case, arrange them after the grinding roller arrangements in order to ensure the uniformity of the control the grinding effect achieved and, if necessary, correct the grinding effect by changing the profile of the gap formed. It has also proven useful to arrange the arrangement for grinding or milling a scaffolding that breaks or loosens using the push-rolling method. In all of these cases, extensive and uniform processing of the scale considerably relieves downstream baths, so that they work with shorter dwell times and can be made in shorter lengths.

Claims (9)

1. Anordnung zum Entfernen von Zunder von warmgewalztem Stahlband durch Schleifen bzw. Fräsen, insbesondere vor dem Einbringen desselben in eine Beize,
dadurch gekennzeichnet,
daß in einem Ständer gegen die Oberfläche des Stahlbandes (4) anstellbare, angetriebene Schleifwalzen (5, 6) vorge­sehen sind von denen mindestens zwei sich ergänzende axial gegensinnig verschiebbar sind, und deren Ballen mit invers gerichteten S-förmigen Konturen derart ausgestattet sind, daß die Konturen in einer bestimmten axialen Stellung der Schleifwalzen gegeneinander sich lückenlos ergänzen.
1. Arrangement for removing scale from hot-rolled steel strip by grinding or milling, in particular before it is introduced into a pickle,
characterized by
that in a stand against the surface of the steel belt (4) adjustable, driven grinding rollers (5, 6) are provided, of which at least two complementary are axially displaceable in opposite directions, and whose bales are equipped with inverse S-shaped contours such that the Contours complement each other in a certain axial position of the grinding rollers.
2. Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Ballen der Schleifwalzen (5, 6) mit einer abrasiven Oberflächentextur versehen sind.
2. Arrangement according to claim 1,
characterized by
that the bales of the grinding rollers (5, 6) are provided with an abrasive surface texture.
3. Anordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß den Ballen der Schleifwalzen (5, 6) ein Schleifmittel zuführbar ist.
3. Arrangement according to claim 1 or 2,
characterized by
that the bales of the grinding rollers (5, 6) can be supplied with an abrasive.
4. Anordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Ballen der Schleifwalzen (5, 6) mit Fräskanten ausgestattet sind.
4. Arrangement according to claim 1 or 2,
characterized by
that the bales of the grinding rollers (5, 6) are equipped with milling edges.
5. Anordnung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß den Lagerkörpern der Walzenzapfen (9) der Schleif­walzen (5, 6) Biegevorrichtungen (11) für die Schleif­walzen zugeordnet sind.
5. Arrangement according to one of claims 1 to 4,
characterized by
that the bearing bodies of the roller journals (9) of the grinding rollers (5, 6) are assigned bending devices (11) for the grinding rollers.
6. Anordnung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß den Schleifwalzen (5, 6) diese hinterfangende, minde­stens Ballenbereiche derselben abstützende Stützwalzen zugeordnet sind.
6. Arrangement according to one of claims 1 to 5,
characterized by
that the grinding rollers (5, 6) are associated with these backing, at least bale areas supporting support rollers.
7. Anordnung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß mehrere, mindestens zwei, Schleifrollensätze (5, 6; 14, 15) in Längsrichtung des Stahlbandes (4) hinterein­ander vorgesehen sind.
7. Arrangement according to one of claims 1 to 6,
characterized by
that several, at least two, grinding roller sets (5, 6; 14, 15) are provided one behind the other in the longitudinal direction of the steel belt (4).
8. Anordnung nach einem der Ansprüche 1 bis 7,
gekennzeichnet durch
eine Steuervorrichtung (16), die aufgrund vorgegebener und/oder durch Detektoren (13) ermittelter, das Profil des Stahlbandes (4) kennzeichnender Werte inverse axiale Verschiebungen der profilierten Schleifwalzen (5, 6) sowie gegebenenfalls Biegebeanspruchungen derselben bewirkt, welche die aufliegenden Mantellinien der Schleifwalzen (5, 6, 14, 15) der Profilwölbung des Stahlbandes anpassen.
8. Arrangement according to one of claims 1 to 7,
marked by
a control device (16) which, on the basis of predetermined values and / or values determined by detectors (13) and characterizing the profile of the steel belt (4), inverse axial displacements of the profiled grinding rollers (5, 6) and, if appropriate, bending stresses thereof, which causes the surface lines of the surface Adjust the grinding rollers (5, 6, 14, 15) to the profile curvature of the steel belt.
9. Anordnung nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
daß der Steuervorrichtung optische, die einander gegen­überliegenden Oberflächen des Stahlbandes erfassende Sen­soren zugeordnet sind, welche bei der Abtastung des Band­profiles ermitteln, in welchen Breitenbereichen noch Zun­derschichten vorhanden sind, und in welchen Breitenbereichen Stahl erkennbar ist.
9. Arrangement according to one of claims 1 to 8,
characterized by
that the control device is assigned optical sensors which detect the opposing surfaces of the steel strip and which, when the strip profile is scanned, determine in which width ranges there are still layers of scale and in which width ranges steel is recognizable.
EP86117916A 1986-01-07 1986-12-22 Arrangement for de-scaling hot-rolled steel bands Expired EP0230644B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117916T ATE47058T1 (en) 1986-01-07 1986-12-22 ARRANGEMENT FOR REMOVING SCALE FROM HOT ROLLED STEEL STRIPS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863600144 DE3600144A1 (en) 1986-01-07 1986-01-07 ARRANGEMENT FOR REMOVING TIN, FROM HOT ROLLED STEEL TAPES
DE3600144 1986-01-07

Publications (2)

Publication Number Publication Date
EP0230644A1 true EP0230644A1 (en) 1987-08-05
EP0230644B1 EP0230644B1 (en) 1989-10-11

Family

ID=6291433

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Application Number Title Priority Date Filing Date
EP86117916A Expired EP0230644B1 (en) 1986-01-07 1986-12-22 Arrangement for de-scaling hot-rolled steel bands

Country Status (6)

Country Link
US (1) US4862570A (en)
EP (1) EP0230644B1 (en)
JP (1) JPS62187515A (en)
CN (1) CN87100083A (en)
AT (1) ATE47058T1 (en)
DE (2) DE3600144A1 (en)

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Also Published As

Publication number Publication date
ATE47058T1 (en) 1989-10-15
DE3600144A1 (en) 1987-07-09
CN87100083A (en) 1987-09-23
EP0230644B1 (en) 1989-10-11
DE3666158D1 (en) 1989-11-16
JPS62187515A (en) 1987-08-15
US4862570A (en) 1989-09-05

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