EP0509350A1 - Roll support device for correcting the cross section of a strip due to elastic deformation of a multi-roll mill for strip material - Google Patents

Roll support device for correcting the cross section of a strip due to elastic deformation of a multi-roll mill for strip material Download PDF

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Publication number
EP0509350A1
EP0509350A1 EP92105839A EP92105839A EP0509350A1 EP 0509350 A1 EP0509350 A1 EP 0509350A1 EP 92105839 A EP92105839 A EP 92105839A EP 92105839 A EP92105839 A EP 92105839A EP 0509350 A1 EP0509350 A1 EP 0509350A1
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EP
European Patent Office
Prior art keywords
support
roll
support rollers
eccentric rings
eccentricity
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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.)
Withdrawn
Application number
EP92105839A
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German (de)
French (fr)
Inventor
Bernd Dr.-Ing. Berger
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.)
Sundwiger Eisenhuette Maschinenfabrik & Co GmbH
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Sundwiger Eisenhuette Maschinenfabrik & Co GmbH
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Application filed by Sundwiger Eisenhuette Maschinenfabrik & Co GmbH filed Critical Sundwiger Eisenhuette Maschinenfabrik & Co GmbH
Publication of EP0509350A1 publication Critical patent/EP0509350A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-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
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls

Definitions

  • the invention relates to a roll support device for correcting the strip cross section due to elastic deformations of a multi-roll mill stand for strip material with at least one set of support rollers assigned to each work roll, which are distributed over the entire axial length of the work roll and rotatable on a support axis held in the roll stand of the roll stand are supported, which is supported on support saddles arranged between the support rollers and carried by the roller stand, at least the support rollers arranged between the end support rollers can be adjusted to different eccentricity by means of eccentric rings, the support axis is held in the roller stand so as to be rotatably adjustable, and the eccentric rings for the individual support rollers are non-rotatably on the support axis are arranged with eccentricity effective to different degrees when the support axis is rotated.
  • a similar set of support rollers is assigned to each work roller.
  • the eccentric rings which are assigned to the two opposite support rollers, have a mirror-image eccentricity and are arranged between the support saddles and the support axes of the support rollers.
  • the eccentric rings of opposing support saddles are adjusted by a common rack with double-sided toothing, in which pinions carried by the eccentric rings engage.
  • Each rack is driven by its own drive so that different eccentricities can be set on the individual support rollers according to the desired correction.
  • the drives of the various racks are controlled by a control device.
  • Such a roller support device enables the strip cross-section to be corrected as a result of the elastic deformations, but the effort involved is considerable.
  • a roll support device with which the correction of the strip cross section can be carried out with less effort is known from the US Pat. No. 3,528,274.
  • support rollers are arranged on a rotationally adjustable support axis.
  • the support axle is mounted in eccentric rings that are supported by support saddles. Through the Eccentricity of the eccentric rings, the support axis is arched during their rotation adjustment, so that the support rollers press against the work roll in a curved line.
  • the disadvantage of this device is that, in addition to the resistance to deformation of the working shaft, the resistance to deformation of the support shaft must also be overcome when it is rotated. Therefore, large driving forces are required for the rotary adjustment of the supporting axis.
  • the invention has for its object to provide a roller support device of the type mentioned, with which it is possible with comparatively little effort and low adjustment forces to correct the strip cross section due to the different elastic deformations.
  • the eccentric rings are arranged in a rotationally fixed manner on the supporting axis, it is possible to carry out the desired correction of the deflection of the work roller simply by rotating the supporting axis.
  • the different eccentricity for correcting the deflection of the work rolls in the axial direction can already be taken into account when dimensioning the individual eccentric rings, so that it is not necessary to make different adjustments on the individual eccentric rings.
  • the design effort required for the roll support device according to the invention is therefore comparatively small.
  • Eccentric rings of support rollers for work rolls, which are wedged onto the supporting axles, are known, but they cannot be used to correct deflection of work rolls.
  • the wedged support rollers which are only arranged in pairs at the ends of the work rolls on rotatable support axles, serve to turn on the work rolls (DE-PS 559414).
  • Both roller support devices have support rollers 1 - 5 in the form of races, which are rotatably supported by bearings 6 - 10 on rings 11 - 15.
  • the rings 11-15 are arranged on a support shaft 16 which is held in a rotatably adjustable manner in a stand 17, only indicated in the drawing, of the multi-roll mill stand, which is otherwise not shown.
  • the support axle 16 is supported on support seats 18-23 arranged between the individual support rollers 1-5 and supported by the roller stand 17. Rings 24-29 are arranged between the individual support saddles 18-23 and the support axle 16.
  • the support rollers 1-5 support a work roll W1 laterally in the upper area.
  • Each work roll W1 is supported not only by the set of support rollers 1-5 but also by a set of support rollers arranged in mirror image.
  • the middle rings 12, 13, 14 are designed as eccentric rings and wedged onto the support shaft 16 in a rotationally fixed manner.
  • the eccentric rings 12, 13, 14 either have such a different eccentricity or are rotatably offset from one another with respect to their maximum eccentricity that when the support axis 16 rotates, the support rollers 2-4 shift radially in such a way that an arcuate support line for the work roll W1 results.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)

Abstract

The invention relates to a roll support device for correcting the cross-section of a strip due to elastic deformation of a multi-roll mill for strip material, having at least one set of support rollers (1 - 5) assigned to each working roll (W1, W2), which support rollers are distributed over the entire axial length of the working roll (W1) and are mounted so as to be rotatable on a carrying axle (16) which is held in the roll housing (17) of the roll mill and supported on support saddles (18 - 23) arranged between the support rollers (1 - 5) and carried by roll housings (17, 47), at least the support rollers (2 - 4) arranged between the terminal support rollers (1, 5) being adjustable by means of eccentric rings (12 - 14) to different degrees of eccentricity, the carrying axle (16, 46) being held so as to be rotationally adjustable in the roll housing (17) and the eccentric rings (12 - 14) for the individual support rollers (2 - 4) being arranged so as to be rotationally fixed on the carrying axle (16, 46), with an eccentricity of varying effectiveness on rotation of the carrying axle (16). To correct, in operation, the deflection of the working roll (W1) at low adjusting forces, eccentric rings (12 - 14) are arranged between the carrying axle (16) and the support rollers (2 - 4). <IMAGE>

Description

Die Erfindung bezieht sich auf eine Walzenstützvorrichtung zur Korrektur des Bandquerschnittes infolge elastischer Verformungen eines Vielwalzen-Walzgerüstes für Bandmaterial mit mindestens eine einer jeden Arbeitswalze zugeordneten Satz Stützrollen, die über die gesamte axiale Länge der Arbeitswalze verteilt angeordnet und auf einer im Walzenständer des Walzgerüstes gehaltene Tragachse drehbar gelagert sind, die an zwischen den Stützrollen angeordneten, vom Walzenständer getragenen Stützsätteln abgestützt ist, wobei zumindest die zwischen den endseitigen Stützrollen angeordneten Stützrollen mittels Exzenterringen auf unterschiedliche Exzentrizität einstellbar sind, die Tragachse drehverstellbar im Walzenständer gehalten ist und die Exzenterringe für die einzelnen Stützrollen drehfest auf der Tragachse mit bei Verdrehung der Tragachse unterschiedlich stark wirksamer Exzentrizität angeordnet sind.The invention relates to a roll support device for correcting the strip cross section due to elastic deformations of a multi-roll mill stand for strip material with at least one set of support rollers assigned to each work roll, which are distributed over the entire axial length of the work roll and rotatable on a support axis held in the roll stand of the roll stand are supported, which is supported on support saddles arranged between the support rollers and carried by the roller stand, at least the support rollers arranged between the end support rollers can be adjusted to different eccentricity by means of eccentric rings, the support axis is held in the roller stand so as to be rotatably adjustable, and the eccentric rings for the individual support rollers are non-rotatably on the support axis are arranged with eccentricity effective to different degrees when the support axis is rotated.

Ohne eine solche Walzenstützvorrichtung ist es praktisch nicht möglich, Bänder mit einem fehlerfreien Bandquerschnitt, also nicht mit einem balligen sondern planen Bandquerschnitt, zu erhalten. Solche Fehler beim Walzen sind darauf zurückzuführen, daß die Walzkraft eine elastische Formänderung an den sehr belasteten Walzgerüstteilen bewirkt. Dazu gehören beispielsweise eine Dehnung und eine Biegung des Walzenständers, eine Stauchung der Anstellteile, Abplattungen und Stauchungen der Drehteile usw.Without such a roller support device, it is practically not possible to obtain strips with an error-free strip cross-section, that is to say not with a spherical but flat strip cross-section. Such errors in rolling are due to the fact that the rolling force elastic deformation of the very stressed roll stand parts. This includes, for example, expansion and bending of the roll stand, compression of the adjustment parts, flattening and compression of the turned parts, etc.

Bei einer aus der Praxis bekannten Walzenstützvorrichtung eines Zwanzigwalzengerüstes der eingangs genannten Art, mit der solche Walzfehler vermeidbar sind, ist jeder Arbeitswalze ein gleichartiger Satz Stützrollen zugeordnet. Die Exzenterringe, die den beiden oben gegenüberliegenden Stützrollen zugeordnet sind, haben eine spiegelbildliche Exzentrizität und sind zwischen den Stützsätteln und den Tragachsen der Stützrollen angeordnet. Verstellt werden die Exzenterringe gegenüberliegender Sützsättel von einer jeweils gemeinsamen Zahnstange mit zweiseitiger Verzahnung, in die von den Exzenterringen getragene Zahnritzel eingreifen. Damit entsprechend der gewünschten Korrektur unterschiedliche Exzentrizitäten an den einzelnen Stützrollen eingestellt werden können, wird jede Zahnstange von einem eigenen Antrieb angetrieben. Die Antriebe der verschiedenen Zahnstangen werden von einer Steuereinrichtung gesteuert.In a roller support device of a type known from practice of a twenty-roll stand of the type mentioned at the beginning, with which such rolling errors can be avoided, a similar set of support rollers is assigned to each work roller. The eccentric rings, which are assigned to the two opposite support rollers, have a mirror-image eccentricity and are arranged between the support saddles and the support axes of the support rollers. The eccentric rings of opposing support saddles are adjusted by a common rack with double-sided toothing, in which pinions carried by the eccentric rings engage. Each rack is driven by its own drive so that different eccentricities can be set on the individual support rollers according to the desired correction. The drives of the various racks are controlled by a control device.

Eine solche Walzenstützvorrichtung ermöglicht zwar die Korrektur des Bandquerschnittes infolge der elastischen Verformungen, doch ist der Aufwand dafür erheblich.Such a roller support device enables the strip cross-section to be corrected as a result of the elastic deformations, but the effort involved is considerable.

Eine Walzstützvorrichtung, mit der die Korrektur des Bandquerschnittes mit geringerem Aufwand vorgenommen werden kann, ist aus der amerikanischen Patentschrift US-PS 3 528 274 bekannt. Bei dieser Vorrichtung sind Stützrollen auf einer drehverstellbaren Tragachse angeordnet. Die Tragachse ist in Exzenterringen gelagert, die von Tragsätteln getragen werden. Durch die Exzentrizität der Exzenterringe wird die Tragachse bei ihrer Drehverstellung durchbogen, so daß die Stützrollen in einer gekrümmten Linie gegen die Arbeitswalze drücken.A roll support device with which the correction of the strip cross section can be carried out with less effort is known from the US Pat. No. 3,528,274. In this device, support rollers are arranged on a rotationally adjustable support axis. The support axle is mounted in eccentric rings that are supported by support saddles. Through the Eccentricity of the eccentric rings, the support axis is arched during their rotation adjustment, so that the support rollers press against the work roll in a curved line.

Nachteilig ist bei dieser Vorrichtung, daß neben dem Verformungswiderstand der Arbeitswelle auch der Verformungswiderstand der Tragachse bei deren Drehverstellung überwunden werden muß. Daher sind große Antriebskräfte zur Drehverstellung der Tragachse erforderlich.The disadvantage of this device is that, in addition to the resistance to deformation of the working shaft, the resistance to deformation of the support shaft must also be overcome when it is rotated. Therefore, large driving forces are required for the rotary adjustment of the supporting axis.

Der Erfindung liegt die Aufgabe zugrunde, eine Walzenstützvorrichtung der eingangs genannten Art zu schaffen, mit der es bei vergleichsweise geringem Aufwand und geringen Verstellkräften möglich ist, den Bandquerschnitt infolge der unterschiedlichen elastischen Verformungen zu korrigieren.The invention has for its object to provide a roller support device of the type mentioned, with which it is possible with comparatively little effort and low adjustment forces to correct the strip cross section due to the different elastic deformations.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Exzenterringe zwischen der Tragachse und den Stützrollen angeordnet sind.This object is achieved in that the eccentric rings are arranged between the support shaft and the support rollers.

Da bei der erfindungsgemäßen Walzenstützvorrichtung die Exzenterringe drehfest auf der Tragachse angeordnet sind, ist es allein durch Verdrehung der Tragachse möglich, die gewünschte Korrektur der Durchbiegung der Arbeitswalze vorzunehmen. Die für die Korrektur der Durchbiegung der Arbeitswalzen in Achsrichtung unterschiedliche Exzentrizität läßt sich schon bei der Dimensionierung der einzelnen Exzenterringe berücksichtigen, so daß es nicht notwendig ist, an den einzelnen Exzenterringen unterschiedliche Verstellungen vorzunehmen. Der für die erfindungsgemäße Walzenstützvorrichtung erforderliche konstruktive Aufwand ist deshalb vergleichsweise klein.Since in the roller support device according to the invention the eccentric rings are arranged in a rotationally fixed manner on the supporting axis, it is possible to carry out the desired correction of the deflection of the work roller simply by rotating the supporting axis. The different eccentricity for correcting the deflection of the work rolls in the axial direction can already be taken into account when dimensioning the individual eccentric rings, so that it is not necessary to make different adjustments on the individual eccentric rings. The design effort required for the roll support device according to the invention is therefore comparatively small.

Bei einer Drehverstellung wird die Tragachse bei der erfindungsgemäßen Stützvorrichtung im Gegensatz zu der aus der US 3 528 274 bekannten Vorrichtung nicht gekrümmt, sondern behält ihre gerade Ausrichtung bei. Daher sind bei der Erfindung die für die Drehverstellung erforderlichen Kräften erheblich geringer als bei der bekannten Stützvorrichtung.In the case of a rotary adjustment, in contrast to the device known from US Pat. No. 3,528,274, the supporting axis in the support device according to the invention is not curved, but maintains its straight alignment. Therefore, in the invention, the forces required for the rotary adjustment are considerably lower than in the known support device.

Zwar sind auf den Tragachsen aufgekeilte Exzenterringe von Stützrollen für Arbeitswalzen bekannt, doch läßt sich mit ihnen eine Durchbiegung von Arbeitswalzen nicht korrigieren. In diesem Fall dienen die aufgekeilten, nur an den Enden der Arbeitswalzen paarweise auf drehverstellbaren Tragachsen angeordneten Stützrollen dazu, die Arbeitswalzen anzustellen (DE-PS 559414).Eccentric rings of support rollers for work rolls, which are wedged onto the supporting axles, are known, but they cannot be used to correct deflection of work rolls. In this case, the wedged support rollers, which are only arranged in pairs at the ends of the work rolls on rotatable support axles, serve to turn on the work rolls (DE-PS 559414).

Im folgenden wird die Erfindung anhand einer zwei Ausführungsbeispiele darstellenden Zeichnungen näher erläutert. Im einzelnen zeigen

Figur 1
eine Walzenstützvorrichtung für eine Arbeitswalze im Axialschnitt und im Ausschnitt,
Figur 2
die Walzenstützvorrichtung gemäß Figur 1 im Querschnitt,
Figur 3
die Walzenstützvorrichtung gemäß Figur 1 in einer zu Figur 1 anderen Arbeitsstellung.
The invention is explained in more detail below with reference to drawings showing two exemplary embodiments. Show in detail
Figure 1
a roll support device for a work roll in axial section and in the cutout,
Figure 2
1 in cross section,
Figure 3
the roller support device according to Figure 1 in a different working position to Figure 1.

Beide Walzenstützvorrichtungen weisen Stützrollen 1 - 5 in Form von Laufringen auf, die mit Lagern 6 - 10 auf Ringen 11 - 15 drehbar gelagert sind. Die Ringe 11 - 15 sind auf einer Tragachse 16 angeordnet, die in einem in der Zeichnung nur angedeuteten Ständer 17 des im übrigen nicht dargestellten Vielwalzen-Walzgerüstes drehverstellbar gehalten ist.Both roller support devices have support rollers 1 - 5 in the form of races, which are rotatably supported by bearings 6 - 10 on rings 11 - 15. The rings 11-15 are arranged on a support shaft 16 which is held in a rotatably adjustable manner in a stand 17, only indicated in the drawing, of the multi-roll mill stand, which is otherwise not shown.

Die Tragachse 16 ist abgestützt an zwischen den einzelnen Stützrollen 1 - 5 angeordneten, vom Walzenständer 17 getragenen Stützsätten 18 - 23. Zwischen den einzelnen Stützsätteln 18 - 23 und der Tragachse 16 sind Ringe 24 - 29 angeordnet.The support axle 16 is supported on support seats 18-23 arranged between the individual support rollers 1-5 and supported by the roller stand 17. Rings 24-29 are arranged between the individual support saddles 18-23 and the support axle 16.

Die Stützrollen 1 - 5 stützen eine Arbeitswalze W1 im oberen Bereich seitlich ab. Jede Arbeitswalze W1 ist nicht nur von dem Satz Stützrollen 1 - 5 sondern auch von einem dazu spiegelbildlich angeordneten Satz Stützrollen abgestützt.The support rollers 1-5 support a work roll W1 laterally in the upper area. Each work roll W1 is supported not only by the set of support rollers 1-5 but also by a set of support rollers arranged in mirror image.

Die mittleren Ringe 12, 13, 14 sind als Exzenterringe ausgebildet und drehfest auf der Tragachse 16 aufgekeilt. Die Exzenterringe 12, 13, 14 haben entweder eine derart unterschiedliche Exzentrizität oder sind bezüglich ihrer maximalen Exzentrizität derart gegeneinander drehversetzt, daß bei Drehung der Tragachse 16 sich die Stützerrollen 2 - 4 radial derart verlagern, daß sich eine bogenförmige Stützlinie für die Arbeitswalze W1 ergibt.The middle rings 12, 13, 14 are designed as eccentric rings and wedged onto the support shaft 16 in a rotationally fixed manner. The eccentric rings 12, 13, 14 either have such a different eccentricity or are rotatably offset from one another with respect to their maximum eccentricity that when the support axis 16 rotates, the support rollers 2-4 shift radially in such a way that an arcuate support line for the work roll W1 results.

Claims (3)

Walzenstützvorrichtung zur Korrektur des Bandquerschnittes infolge elastischer Verformungen eines Vielwalzen-Walzgerüsts für Bandmaterial mit mindestens eine einer jeden Arbeitswalze (W1, W2) zugeordneten Satz Stützrollen (1 - 5), die über die gesamte axiale Länge der Arbeitswalze (W1) verteilt angeordnet und auf einer im Walzenständer (17) des Walzgerüstes gehaltene Tragachse (16) drehbar gelagert sind, die an zwischen den Stützrollen (1 - 5) angeordneten, vom Walzenständer (17, 47) getragenen Stützsätteln (18 - 23) abgestützt ist, wobei zumindest die zwischen den endseitigen Stützrollen (1, 5) angeordneten Stützrollen (2 - 3) mittels Exzenterringen (12 - 14) auf unterschiedliche Exzentrizität einstellbar sind, die Tragachse (16, 46) drehverstellbar im Walzenständer (17) gehalten ist und die Exzenterringe (12 - 14) für die einzelnen Stützrollen (2 - 4) drehfest auf der Tragachse (16) 46) mit bei Verdrehung der Tragachse (16) unterschiedlich stark wirksamer Exzentrizität angeordnet sind,
dadurch gekennzeichnet, daß die Exzenterringe (12 - 14) zwischen der Tragachse (16) und den Stützrollen (2 - 4) angeordnet sind.Roller support device for correcting the strip cross section due to elastic deformations of a multi-roll mill stand for strip material with at least one set of support rollers (1 - 5) assigned to each work roll (W1, W2), which are distributed over the entire axial length of the work roll (W1) and arranged on one in the roll stand (17) of the roll stand, the supporting shaft (16) is rotatably supported, which is supported on support saddles (18 - 23) arranged between the support rollers (1-5) and carried by the roll stand (17, 47), at least the between the end support rollers (1, 5) arranged support rollers (2 - 3) can be adjusted to different eccentricity by means of eccentric rings (12 - 14), the support axis (16, 46) is held in the roller stand (17) so as to be rotatable and the eccentric rings (12 - 14) for the individual support rollers (2 - 4) rotatably on the support shaft (16) 46) with an eccentric effect of different degrees when the support shaft (16) is rotated are arranged,
characterized in that the eccentric rings (12 - 14) are arranged between the support shaft (16) and the support rollers (2 - 4). Walzenstützvorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß die Exzenterringe (12 - 14) eine unterschiedliche Exzentrizität haben.Roller support device according to claim 1,
characterized in that the eccentric rings (12 - 14) have a different eccentricity. Walzenstützvorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die Exzenterringe (12-14) bezüglich ihrer Exzentrizität gegeneinander drehversetzt sind.Roller support device according to claim 1 or 2,
characterized in that the eccentric rings (12-14) are rotationally offset from one another with respect to their eccentricity.
EP92105839A 1991-04-16 1992-04-04 Roll support device for correcting the cross section of a strip due to elastic deformation of a multi-roll mill for strip material Withdrawn EP0509350A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914112392 DE4112392A1 (en) 1991-04-16 1991-04-16 ROLLER SUPPORT DEVICE FOR CORRECTING THE TAPE CROSS SECTION IN RESPECT OF THE ELASTIC DEFORMATIONS IN A MULTI-ROLLER ROLLER FOR STRIP MATERIAL
DE4112392 1991-04-16

Publications (1)

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EP0509350A1 true EP0509350A1 (en) 1992-10-21

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EP92105839A Withdrawn EP0509350A1 (en) 1991-04-16 1992-04-04 Roll support device for correcting the cross section of a strip due to elastic deformation of a multi-roll mill for strip material

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237947C1 (en) * 1992-11-06 1993-10-28 Mannesmann Ag Multi-roll strip mill - with two work rolls, intermediate back-up rolls and support roller units adjustable by eccentric ring to provide roll camber for control of strip flatness

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01237011A (en) * 1988-03-16 1989-09-21 Mitsubishi Heavy Ind Ltd Crown control apparatus for split reinforced roll
JPH02295609A (en) * 1989-05-08 1990-12-06 Nisshin Steel Co Ltd Roll wiper

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528274A (en) * 1967-10-11 1970-09-15 Textron Inc Roll bending

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01237011A (en) * 1988-03-16 1989-09-21 Mitsubishi Heavy Ind Ltd Crown control apparatus for split reinforced roll
JPH02295609A (en) * 1989-05-08 1990-12-06 Nisshin Steel Co Ltd Roll wiper

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