EP3784423A1 - Cross-rolling mill with hydraulic roller actuator - Google Patents

Cross-rolling mill with hydraulic roller actuator

Info

Publication number
EP3784423A1
EP3784423A1 EP19719287.5A EP19719287A EP3784423A1 EP 3784423 A1 EP3784423 A1 EP 3784423A1 EP 19719287 A EP19719287 A EP 19719287A EP 3784423 A1 EP3784423 A1 EP 3784423A1
Authority
EP
European Patent Office
Prior art keywords
rolling
work rolls
block
roll
mill
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
EP19719287.5A
Other languages
German (de)
French (fr)
Other versions
EP3784423B1 (en
Inventor
Frank D'HONE
Martin Sauerland
Matthias Krahn
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 Group GmbH
Original Assignee
SMS Group GmbH
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 Group GmbH filed Critical SMS Group GmbH
Publication of EP3784423A1 publication Critical patent/EP3784423A1/en
Application granted granted Critical
Publication of EP3784423B1 publication Critical patent/EP3784423B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
    • 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
    • B21B13/008—Skew rolling stands, e.g. for rolling rounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B21B2271/04—Screw-down speed, draft speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the invention relates to a cross rolling mill for rolling a block over a mandrel into a hollow block, comprising a plurality of work rolls each applying a substantially radially directed rolling force to the block, the work rolls being carried in a rolling stand and the gap between the work rolls, Preferably, the orientation of the roll axis of at least one of the work rolls relative to the block, is variable. Furthermore, the invention relates to a method for producing a hollow block from a block by means of such a cross rolling mill. 2. State of the art
  • a preheated block in steel preheated to about 1,250 ° C block, rolled by means of two or more main working rolls on a mandrel located between the mandrel to a hollow block.
  • the work rolls exert on the block a substantially radially directed rolling force and are supported and supported for support in a rolling stand, a so-called rolling stand, such that at least the rolling gap between the work rolls is set to the respective desired wall thickness of the hollow block to be produced can be.
  • mechanical spindle drives have been used for decades, which allow at least one nip setting before and after the rolling process. A roll gap setting during the rolling process, in particular an automated roll gap adjustment even during the rolling process itself, this is nevertheless not possible.
  • a cross rolling mill for rolling a block over a mandrel to a hollow block, in which instead of the previously used mechanical Anstellelemente such as spindle drives, hydraulic Anstellelemente, preferably hydraulic capsules are provided for, the change in the roll gap, preferably Also, the alignment of the roll axis of at least one of the work rolls against the block to effect.
  • the change of the roll gap by means of hydraulic setting elements in relation to the block as a workpiece is understood to mean that the work rolls are realigned to one another as required, whereby the roll gap dimension and geometry also remains variable during the rolling process.
  • an alignment with respect to the block to be formed into a hollow block takes place between the respective rolling processes and, during the rolling processes, the alignment of at least one of the roll axes also or alternatively with respect to the other work roll (s).
  • the hydraulic Anstellelemente are preferably connected in a usual manner with chocks, via which the work rolls are mounted adjustable in the respective rolling mill.
  • a beveling mill is provided for the first time, which allows a change in the roll gap geometry or any other type of Stördorfnkompensation even during the rolling process due to the hydraulic Anstellelemente.
  • the work rolls are pre-set by the hydraulic setting elements to a certain distance from one another, the so-called roll gap.
  • Symmetrically between the work rolls is located in the inventive slanting mill held by a mandrel mandrel, above which the block is then rolled to form a hollow block. Due to the oblique position of the work rolls, the forming of the block takes place in a hollow block over the mandrel fixedly arranged in the nip and due to the force applied by the oblique position of the work rolls on the block propulsion.
  • the roll gap increases as a result, and the symmetry of the arrangement of Work rolls and possibly the dome to each other shifts, especially because, for example, the upper and lower work rolls are different in design, for example, moved up or down.
  • the center of the work rolls shifts to each other and the mandrel and thus the outlet side of the cross rolling mill, which leads to undesirable effects on the quality of the hollow block produced.
  • the wall thickness distribution of the hollow block occur due to the displacement of the work roll centers to each other increasingly eccentricities, which are ultimately to be found even in the finished rolled-out tube
  • hydraulic setting elements overcomes this disadvantage of previously existing cross rolling mills.
  • the use of hydraulic setting elements preferably hydraulic capsules, enables the dynamic minimization or complete compensation of the stator expansion and the associated displacement of the roll position relative to each other.
  • Changes in the roll gap preferably also the alignment of the roll axis of at least one of the work rolls against the block or any other work roll, preferably to compensate as far as possible.
  • manipulated variables are preferably used for the hydraulic adjusting elements of the work rolls Stördorfnausregelungen acting horizontally in the x direction transverse to the rolling direction, in the y direction vertical to the rolling direction and in the z direction in the rolling direction to the outlet side.
  • the inventive cross rolling mill according to the first aspect of the invention has, in addition to the work rolls, preferably the upper and lower work rolls, the roll gap laterally delimiting disks or guide shoes, via which a central positioning of the block and the outgoing hollow block can be influenced within the roll gap.
  • Diescheremian usually have a circumferential profile in the form of the hollow block to be rolled and are arranged relative to the hollow block an explicat within the cross rolling mill. It is preferred in this context, although the Diescheremian or the guide shoes have hydraulic Anstellelemente that preferably support or can cause a dynamic and online-acting Störuccnkompensation.
  • a measuring means is provided with which a change in the roll gap geometry and / or the roll gap displacement and / or the position of the work rolls in space and their change during the rolling operation can be determined.
  • this measuring means is connected to an evaluation unit which is suitable for determining the disturbance variables to be compensated.
  • a cross rolling mill is provided, which is capable of dynamically and permanently preferably to determine any change in the rolling process, for example, based on a measured stator expansion and the associated change in the arrangement of the work rolls and possibly the dome to each other.
  • the measuring means may in principle be arranged at any point of the roll stand or of its built-in elements, wherein a
  • an indirect measurement for example on a guide element such as a Diescheremia or a guide shoe still allows a correlation on a correlation on a conclusion on the position of the work rolls or the individual guide elements in the stand under load rolling stand.
  • the measuring means comprises an optical image detection unit, which makes it possible to separate the measuring unit away from the rolling stand and the circumstances otherwise acting thereon on the measuring unit and interfering with the measurement result.
  • the measuring means comprises a camera, preferably a CCD camera. By means of such a camera, the measuring unit in the rolling mill can be positioned almost anywhere on the roll stand and at the same time, optionally after a corresponding calibration, provide all the desired measurement results.
  • the measuring means is capable of a connected to the rolling stand picture element, preferably one or more connected to the adjusting elements for the work rolls
  • Image elements to capture and then able to determine their position and / or shape change during the rolling process are particularly preferred if the at least one picture element is an active luminous element which, in an extremely preferred embodiment of the invention, is circular and of defined diameter or oval with a defined shape. It is also preferred if the picture element is square or rectangular, for example, then the evaluation of the change of one or more picture element diagonals under load allows an indication of the rolling stand expansion or distortion. In this way, on the one hand, the possibility is created to measure each roll stand strain and / or distortion directly and directly, on the other hand, the image acquisition is advantageously supported by particularly simple means by the design of the picture element as an active light.
  • the calibration of the measurement is supported by particularly simple means by the preferred embodiment of the pixel with circular shape and defined diameter or oval with predetermined shape or square or rectangular with known diagonal dimensions, on the other hand also created the possibility, not only the change in position of the pixel during roll stand stretch, but also any shape change of the pixel due to any other type of distortion of the roll stand.
  • This can be used particularly advantageously if the optical image acquisition not only the center (in a circular shape) or the intersection of the major axes (oval shape) or the intersection of the surface diagonal (square or rectangular shape) of a pixel, but the entire surface, but at least the picture element edge and its center, is able to capture.
  • change hydraulic adjusting preferably hydraulic capsules, which are directly or indirectly connected to the work rolls, for example via roll chocks, during the Rolling the nip, preferably also the orientation of the roll axis of at least one of the work rolls relative to the block.
  • the change in the roll gap is effected if disturbances are determined by an evaluation unit in advance by means of measured changes in the roll gap geometry and / or the roll gap displacement and / or the position of the work rolls in space and their change during the rolling operation have been.
  • a signal for the control variable compensation is output to the hydraulic setting elements.
  • the evaluation unit is connected to a measuring means, preferably an optical measuring means located remotely from the rolling stand, in particular a measuring means with an optical image detection unit.
  • this measuring device can detect a picture element connected to the rolling stand, preferably one or more picture elements connected to the setting elements for the work rolls, and determine their position and / or shape changes during the rolling process.
  • the movement of the picture elements is preferably detected with high precision by means of the optical measuring means, the changes Ax1 (t) and Ay1 (t) of the upper work roll or Ax2 (t), Ay2 (t) of the lower work roll preferably being determined online and by means of the evaluation unit is transmitted to the control and regulation unit for minimizing or compensating the manipulated variables.
  • the control and regulation unit for minimizing or compensating the manipulated variables.
  • the upper and / or lower work rolls also or exclusively the position and / or position of the dome and in addition to this or independent of other changes, the position and / or position of the Diescherrion for Block or hollow block is changed dynamically, so as to effect the compensation of previously determined disturbances or at least support.
  • the invention allows the dynamic compensation of the expansion of the rolling mill during rolling and the reduction or elimination of errors in the pipe to be produced by the cross rolling mill.
  • the data acquisition is preferably carried out without contact and removed from the rolling stand, thus free of the measurement result disturbing influences near the roll gap, and allows the highest possible flexibility of the arrangement of the measuring means to the rolling mill depending on local conditions.
  • movements of the roll stand can be detected and compensated during subsequent rolling, possibly also during the ongoing rolling process.
  • the measuring means can be permanently mounted but also designed to be mobile.
  • an optical image acquisition can be used which uses the CaliView® measuring device. It can measure contours from a distance of 8 m to 40 m with an accuracy of 0.1 mm, with CaliView® also having a continuous scan function for checking the measurement.
  • the measurement can thus record during the rolling process movements of the roll stand and the resulting changes in the roll gap and the roll gap geometry and use during operation for readjustment of the work rolls or other manipulated variables. Due to the preferred known shape and dimension of the picture element on the roll stand can also be provided in the arrangement of the measuring means in relation to the rolling mill an angular offset, which should then be considered in the calibration of the meter. Flier die the influence of the vapors occurring during the cross rolling and other influences disturbing the measurement result can be limited to the unavoidable minimum.
  • FIG. 1 shows a schematic view of a part of a cross rolling mill according to a first embodiment of the invention
  • Figure 2 shows a schematic representation of a part of a
  • FIG. 3 shows a flow diagram for the application of a device according to the invention
  • FIG. 1 shows, in a first embodiment, the mode of action of a bevelling mill comprising an upper work roll 1 and a lower work roll 2.
  • the upper and lower work rolls 1, 2 are in the form of two truncated cones connected together at their large end face and act in the transformation of a block 3 in a direction from left to right (z-direction) in Figure 1 with a mandrel 4 arranged on a mandrel 5 together.
  • the block 3 is at a suitable position of the upper and lower work rolls 1, 2 relative to the block 3 by the rotation of the upper and lower work rolls 1, 2 about their longitudinal axes 1 a and 2a through the nip between the upper and lower work rolls 1, 2nd and conveyed across the mandrel 5 from the input side 6 to the output side 7.
  • hydraulic adjusting 8a, 8b, and 9a, 9b are arranged, via which the position of the work rolls 1, 2 to each other and in relation to the block 3 is almost arbitrarily variable, in particular the manner shown in a y-direction vertical to the rolling direction.
  • FIG. 2 shows another embodiment of an essential part of a rolling mill according to the invention, comprising an upper work roll 1 and a lower work roll 2, each showing a truncated cone shape with unsteady coat course.
  • a nip 10 is formed, in which the block 3 enters by movement in the direction of z on the mandrel 5 and there in cooperation of the upper and lower work rolls 1, 2 with the locally fixed piercing pin fifth is converted to a (not shown) hollow block.
  • hydraulic adjusting elements 8a, 8b and 9a, 9b are arranged, by means of which a change of the roll gap 10 and the local position of the roll axes 1a, 1b can be effected
  • FIG. 3 shows a schematic flow diagram of the method according to the invention by means of a skew rolling mill 11 according to the invention, which carries an upper work roll 1 and a lower work roll 2.
  • Image elements MM1 and MM2 are arranged roll stand of the roll stand 11 and are permanently monitored during the rolling operation with high precision and dynamically both in terms of their location and their form of a remote and not pictorially illustrated camera.
  • Each change of position in the x-direction and y-direction Dx1 (t), Ay1 (t) for the upper work roll 1 and Dx2 (t), Ay2 (t) for the lower work roll 2 are detected by the (not shown) measuring unit and on a (also not shown) transmitted evaluation.
  • this evaluation unit determines whether the positional changes of the picture elements MM1, MM2 detected by the image unit (not shown) are to be regarded as correcting variables to be compensated. If this is the case, the disturbances determined by the evaluation unit are forwarded to the HGC controller as a control and regulation unit (hydraulic gap control controller).
  • HGC control and regulation unit
  • control commands Y1, Y2 are output to the hydraulic Anstellelemente 8, 9.
  • These hydraulic adjusting elements 8, 9 change by adjusting the upper work roll 1 and / or the lower work roll 2 with respect to the (not shown) mandrel the roll gap geometry and optionally the orientation of the (not shown) roll axes to each other. This makes it possible to output during the rolling process highly dynamic with constant detection and evaluation of measurement data online control and regulation commands that are able to positively influence the rolling result and the course of the cross rolling process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Abstract

The invention relates to a cross-rolling mill (11) for rolling a block over a mandrel so as to form a hollow block, comprising a plurality of working rollers (1, 2), each of which exerts a substantially radially aligned rolling force onto the block. The working rollers are supported in a roll stand, and the gap between the working rollers and preferably also the alignment of the rolling axis of at least one of the working rollers relative to the block can be modified. Hydraulic actuators (8, 9), preferably hydraulic capsules, are provided in order to modify the rolling gap and preferably also the alignment of the rolling axis of at least one of the working rollers relative to the block. The invention additionally relates to a method for producing a hollow block out of a block using a cross-rolling mill (11) for rolling a block over a mandrel. The cross-rolling mill comprises a plurality of working rollers (1, 2), each of which exerts a substantially radially aligned rolling force onto the block. The working rollers are supported in a roll stand, and the gap between the working rollers and preferably also the alignment of the rolling axis of at least one of the working rollers relative to the block can be modified. Hydraulic actuators (8, 9), preferably hydraulic capsules, modify the rolling gap and preferably also the alignment of the rolling axis of at least one of the working rollers relative to the block during the rolling process.

Description

Schrägwalzwerk mit hydraulischer Walzenanstellung  Cross rolling mill with hydraulic roller adjustment
1. Gebiet der Erfindung 1. Field of the invention
Die Erfindung betrifft ein Schrägwalzwerk zum Walzen eines Blocks über einem Dorn zu einem Hohlblock, umfassend eine Mehrzahl von Arbeitswalzen, die jeweils eine im Wesentlichen radial gerichtete Walzkraft auf den Block ausüben, wobei die Arbeitswalzen in einem Walzgerüst getragen sind und der Spalt zwischen den Arbeitswalzen, vorzugsweise auch die Ausrichtung der Walzenachse zumindest einer der Arbeitswalzen gegenüber dem Block, veränderbar ist. Des Weiteren betrifft die Erfindung ein Verfahren zum Herstellen eines Hohlblocks aus einem Block mittels eines solchen Schrägwalzwerks. 2. Stand der Technik The invention relates to a cross rolling mill for rolling a block over a mandrel into a hollow block, comprising a plurality of work rolls each applying a substantially radially directed rolling force to the block, the work rolls being carried in a rolling stand and the gap between the work rolls, Preferably, the orientation of the roll axis of at least one of the work rolls relative to the block, is variable. Furthermore, the invention relates to a method for producing a hollow block from a block by means of such a cross rolling mill. 2. State of the art
Beim Walzen eines metallischen Hohlblocks über einem Dorn mittels des sogenannten Mannesmann-Verfahrens wird ein vorerwärmter Block, bei Stahl ein auf ca. 1.250°C vorerwärmter Block, mittels zweier oder mehr Hauptarbeitswalzen über einem zwischen den Walzen befindlichen Dorn zu einem Hohlblock gewalzt. Die Arbeitswalzen üben während des Walzvorgangs auf den Block eine im Wesentlichen radial gerichtete Walzkraft aus und werden zur Abstützung in einem Walzgerüst, einem sogenannten Walzwerksständer, so gelagert und abgestützt, dass zumindest der Walzspalt zwischen den Arbeitswalzen auf die jeweils gewünschte Wanddicke des zu erzeugenden Hohlblocks eingestellt werden kann. Hierzu werden seit Jahrzehnten mechanische Spindelantriebe verwendet, die zumindest eine Walzspalteinstellung vor und nach dem Walzvorgang ermöglichen. Eine Walzspalteinstellung während des Walzvorgangs, insbesondere eine automatisierte Walzspalteinstellung auch während des Walzvorgangs selbst, ist hierdurch gleichwohl nicht möglich. 3. Aufgabe der Erfindung When rolling a metallic hollow block over a mandrel by means of the so-called Mannesmann method, a preheated block, in steel preheated to about 1,250 ° C block, rolled by means of two or more main working rolls on a mandrel located between the mandrel to a hollow block. During the rolling process, the work rolls exert on the block a substantially radially directed rolling force and are supported and supported for support in a rolling stand, a so-called rolling stand, such that at least the rolling gap between the work rolls is set to the respective desired wall thickness of the hollow block to be produced can be. For this purpose, mechanical spindle drives have been used for decades, which allow at least one nip setting before and after the rolling process. A roll gap setting during the rolling process, in particular an automated roll gap adjustment even during the rolling process itself, this is nevertheless not possible. 3. Object of the invention
Es war daher eine Aufgabe der Erfindung, ein Schrägwalzwerk sowie ein Verfahren zum Walzen eines Blocks über einem Dorn zu einem Hohlblock anzugeben, mittels derer die aus dem Stand der Technik bekannten Probleme gelöst und eine vorzugsweise während des Walzvorgangs und automatisierte Kompensation von ermittelten Störgrößen ermöglicht wird. It was therefore an object of the invention to provide a cross rolling mill and a method for rolling a block over a mandrel to a hollow block, by means of which the problems known from the prior art solved and a preferably during the rolling process and automated compensation of determined disturbances is possible ,
Diese Aufgabe wird im erfindungsgemäßen Sinne mit einem Schrägwalzwerk, umfassend die Merkmale des Anspruchs 1 , sowie einem Verfahren, umfassend die Merkmale des Anspruchs 13, gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen sowie in der nachfolgenden Beschreibung dargelegt. 4. Zusammenfassung der Erfindung This object is achieved in the sense of the invention with a cross rolling mill comprising the features of claim 1 and a method comprising the features of claim 13. Advantageous embodiments of the invention are set forth in the dependent claims and in the following description. 4. Summary of the invention
Gemäß einem ersten Aspekt der Erfindung wird ein Schrägwalzwerk zum Walzen eines Blocks über einem Dorn zu einem Hohlblock angegeben, bei dem anstelle der bisher verwendeten mechanischen Anstellelemente wie etwa Spindelantrieben, hydraulische Anstellelemente, vorzugsweise hydraulische Kapseln, dafür vorgesehen sind, die Veränderung des Walzspalts, vorzugsweise auch die Ausrichtung der Walzenachse zumindest einer der Arbeitswalzen gegenüber dem Block, zu bewirken. Die Veränderung des Walzspalts mittels hydraulischer Anstellelemente gegenüber dem Block als Werkstück wird so verstanden, dass die Arbeitswalzen zueinander je nach Bedarf neu ausgerichtet werden, wodurch die Walzspaltdimension und -geometrie auch während des Walzvorgangs veränderlich bleibt. Während des Walzvorgangs erfolgt somit eine Ausrichtung gegenüber dem zu einem Hohlblock umzuformenden Block, zwischen den jeweiligen Walzprozessen und während der Walzprozesse erfolgt die Ausrichtung zumindest einer der Walzenachsen demnach auch oder alternativ gegenüber der oder den anderen Arbeitswalze(n). Die hydraulischen Anstellelemente sind dabei vorzugsweise in fachüblicher Weise mit Einbaustücken verbunden, über die die Arbeitswalzen in dem jeweiligen Walzgerüst anstellbar gelagert werden. Hierdurch wird erstmals ein Schrägwalzwerk zur Verfügung gestellt, das aufgrund der hydraulischen Anstellelemente eine Veränderung der Walzspaltgeometrie oder jeder anderen Art von Störgrößenkompensation auch während des Walzvorgangs erlaubt. Die Arbeitswalzen werden über die hydraulischen Anstellelemente erfindungsgemäß auf einen bestimmten Abstand zueinander, den sogenannten Walzspalt, voreingestellt. Symmetrisch zwischen den Arbeitswalzen befindet sich im erfindungsgemäßen Schrägwalzwerk der von einer Dornstange gehaltene Dorn, über dem der Block dann zu einem Hohlblock abgewalzt wird. Aufgrund der Schräganstellung der Arbeitswalzen erfolgt die Umformung des Blocks zu einem Hohlblock über den im Walzspalt fest angeordneten Dorn und aufgrund des durch die Schräganstellung der Arbeitswalzen auf den Block aufgebrachten Vortriebs. According to a first aspect of the invention, a cross rolling mill is provided for rolling a block over a mandrel to a hollow block, in which instead of the previously used mechanical Anstellelemente such as spindle drives, hydraulic Anstellelemente, preferably hydraulic capsules are provided for, the change in the roll gap, preferably Also, the alignment of the roll axis of at least one of the work rolls against the block to effect. The change of the roll gap by means of hydraulic setting elements in relation to the block as a workpiece is understood to mean that the work rolls are realigned to one another as required, whereby the roll gap dimension and geometry also remains variable during the rolling process. Thus, during the rolling process, an alignment with respect to the block to be formed into a hollow block takes place between the respective rolling processes and, during the rolling processes, the alignment of at least one of the roll axes also or alternatively with respect to the other work roll (s). The hydraulic Anstellelemente are preferably connected in a usual manner with chocks, via which the work rolls are mounted adjustable in the respective rolling mill. As a result, a beveling mill is provided for the first time, which allows a change in the roll gap geometry or any other type of Störgrößenkompensation even during the rolling process due to the hydraulic Anstellelemente. According to the invention, the work rolls are pre-set by the hydraulic setting elements to a certain distance from one another, the so-called roll gap. Symmetrically between the work rolls is located in the inventive slanting mill held by a mandrel mandrel, above which the block is then rolled to form a hollow block. Due to the oblique position of the work rolls, the forming of the block takes place in a hollow block over the mandrel fixedly arranged in the nip and due to the force applied by the oblique position of the work rolls on the block propulsion.
Während des Walzens entstehen jedoch enorme Kräfte, die unter anderem die Arbeitswalzen auseinanderdrücken. Der gesamte Walzwerksständer wird durch die auf die Arbeitswalzen einwirkenden Kräfte in seiner Form gedehnt oder auf andere Art verzerrt, was schlussendlich auch zu einer Änderung des vorab eingestellten Walzspalts und seiner Geometrie führt. Üblicherweise bewegen sich die Arbeitswalzen, beispielsweise die obere und untere Arbeitswalze, in verschiedenen Raumrichtungen unterschiedlich stark. Dies gilt umso mehr, wenn eine oder mehrere der Arbeitswalzen fest mit dem Walzgerüst und/oder dem Fundament verbunden ist und somit nur minimalen Bewegungen unter Last unterliegt. Dabei geht die vorab eingestellte Anordnung sowohl der Arbeitswalzen als auch gegebenenfalls des Doms verloren. Der Walzspalt vergrößert sich infolge dessen und die Symmetrie der Anordnung der Arbeitswalzen und gegebenenfalls des Doms zueinander verschiebt sich, insbesondere da beispielsweise die obere und untere Arbeitswalze konstruktionsbedingt unterschiedlich stark beispielsweise nach oben oder unten verschoben werden. Letztlich verschiebt sich die Mitte der Arbeitswalzen zueinander und zum Dorn und damit zur Auslaufseite des Schrägwalzwerks, was zu unerwünschten Auswirkungen auf die Qualität des erzeugten Hohlblocks führt. In der Wanddickenverteilung des Hohlblocks treten durch die Verschiebung der Arbeitswalzenmitten zueinander verstärkt Exzentritäten auf, die letztlich auch im fertig ausgewalzten Rohr noch zu finden sind During rolling, however, tremendous forces arise which, among other things, force the work rolls apart. The entire mill stand is stretched or otherwise distorted by the forces acting on the work rolls in its shape, ultimately leading to a change in the pre-set roll gap and its geometry. Usually, the work rolls, for example, the upper and lower work roll, move in different directions in different directions. This is all the more true when one or more of the work rolls is firmly connected to the rolling stand and / or the foundation and thus subject to minimal movement under load. The pre-set arrangement of both the work rolls and possibly the dome is lost. The roll gap increases as a result, and the symmetry of the arrangement of Work rolls and possibly the dome to each other shifts, especially because, for example, the upper and lower work rolls are different in design, for example, moved up or down. Ultimately, the center of the work rolls shifts to each other and the mandrel and thus the outlet side of the cross rolling mill, which leads to undesirable effects on the quality of the hollow block produced. In the wall thickness distribution of the hollow block occur due to the displacement of the work roll centers to each other increasingly eccentricities, which are ultimately to be found even in the finished rolled-out tube
Bisher konnten derartige Störgrößen erst nach Beendigung des Walzvorgangs ermittelt und durch eine Nachjustierung der Arbeitswalzen zueinander vor einem folgenden Walzvorgang kompensiert werden. Eine dynamische Störgrößenkompensation, insbesondere eine während des Walzvorgangs auf Grundlage von online ermittelten Messdaten erfolgende Stellgrößenkompensation, war bisher nicht möglich. Die erfindungsgemäße Verwendung hydraulischer Anstellelemente überwindet diesen Nachteil bisher bestehender Schrägwalzwerke. Erfindungsgemäß wird durch die Verwendung hydraulischer Anstellelemente, vorzugsweise hydraulischer Kapseln, die dynamische Minimierung oder vollständige Kompensation der Ständeraufdehnung und der damit einhergehenden Verschiebung der Walzenposition zueinander ermöglicht. Insbesondere wird erstmals ermöglicht, auch bei wechselnden Lastverhältnissen, z. B. beim Anwalzen, vorzugsweise in Echtzeit, die Störgrößen der Walzspaltänderungen und Walzspaltverschiebungen durch geeigneteSo far, such disturbances could only be determined after completion of the rolling process and compensated for each other by a readjustment of the work rolls before a subsequent rolling process. A dynamic disturbance compensation, in particular a control variable compensation taking place during the rolling process on the basis of measurement data determined online, has not been possible up to now. The use according to the invention of hydraulic setting elements overcomes this disadvantage of previously existing cross rolling mills. According to the invention, the use of hydraulic setting elements, preferably hydraulic capsules, enables the dynamic minimization or complete compensation of the stator expansion and the associated displacement of the roll position relative to each other. In particular, it is possible for the first time, even with changing load conditions, eg. B. during rolling, preferably in real time, the disturbances of the roll gap changes and roll gap displacements by suitable
Veränderungen des Walzspalts, vorzugsweise auch der Ausrichtung der Walzenachse zumindest einer der Arbeitswalzen gegenüber dem Block oder jeder anderen Arbeitswalze, vorzugsweise weitestgehend zu kompensieren. Als Stellgrößen dienen vorzugsweise für die hydraulischen Anstellelemente der Arbeitswalzen Störgrößenausregelungen, die in x-Richtung horizontal quer zur Walzrichtung, in y-Richtung vertikal zur Walzrichtung sowie in z-Richtung in Walzrichtung zur Auslaufseite hin wirken. Changes in the roll gap, preferably also the alignment of the roll axis of at least one of the work rolls against the block or any other work roll, preferably to compensate as far as possible. As manipulated variables are preferably used for the hydraulic adjusting elements of the work rolls Störgrößenausregelungen acting horizontally in the x direction transverse to the rolling direction, in the y direction vertical to the rolling direction and in the z direction in the rolling direction to the outlet side.
Vorzugsweise weist das erfindungsgemäße Schrägwalzwerk gemäß dem ersten Aspekt der Erfindung zusätzlich zu den Arbeitswalzen, vorzugsweise den oberen und unteren Arbeitswalzen den Walzspalt seitlich begrenzende Scheiben oder Führungsschuhe auf, über die eine mittige Positionierung des Blocks und des auslaufenden Hohlblocks innerhalb des Walzspalts beeinflusst werden kann. Diese sogenannten Diescherscheiben weisen üblicherweise ein umlaufendes Profil in der Form des zu walzenden Hohlblocks auf und sind gegenüber dem Hohlblock anstellbar innerhalb des Schrägwalzwerks angeordnet. Bevorzugt wird in diesem Zusammenhang, wenn auch die Diescherscheiben oder die Führungsschuhe hydraulische Anstellelemente aufweisen, die vorzugsweise eine dynamische und online wirkende Störgrößenkompensation unterstützen oder bewirken können. Preferably, the inventive cross rolling mill according to the first aspect of the invention has, in addition to the work rolls, preferably the upper and lower work rolls, the roll gap laterally delimiting disks or guide shoes, via which a central positioning of the block and the outgoing hollow block can be influenced within the roll gap. These so-called Diescherscheiben usually have a circumferential profile in the form of the hollow block to be rolled and are arranged relative to the hollow block anstellbar within the cross rolling mill. It is preferred in this context, although the Diescherscheiben or the guide shoes have hydraulic Anstellelemente that preferably support or can cause a dynamic and online-acting Störgrößenkompensation.
In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Schrägwalzwerks ist ein Messmittel vorgesehen, mit dem eine Veränderung der Walzspaltgeometrie und/oder der Walzspaltverschiebung und/oder der Lage der Arbeitswalzen im Raum sowie deren Veränderung während des Walzbetriebs bestimmbar ist. Besonders bevorzugt wird in diesem Zusammenhang, wenn dieses Messmittel mit einer Auswerteeinheit verbunden ist, die dazu geeignet ist, die zu kompensierenden Störgrößen zu ermitteln. Hierdurch wird ein Schrägwalzwerk zur Verfügung gestellt, welches in der Lage ist, dynamisch und permanent vorzugsweise jedwede Veränderung des Walzvorgangs, beispielsweise anhand einer zu messenden Ständeraufdehnung und der damit verbundenen Veränderung der Anordnung der Arbeitswalzen und gegebenenfalls des Doms zueinander zu ermitteln. Das Messmittel kann prinzipiell an jeder Stelle des Walzgerüsts oder von dessen Einbauelementen angeordnet sein, wobei eine im Wesentlichen direkte Messung an den Arbeitswalzen bevorzugt wird, eine indirekte Messung, beispielsweise an einem Führungselement wie etwa einer Diescherscheibe oder einem Führungsschuh erlaubt gleichwohl über eine entsprechende Korrelationsbetrachtung auch einen Rückschluss auf die Position der Arbeitswalzen bzw. der einzelnen Führungselemente im unter Last stehenden Walzgerüst. In a further preferred embodiment of the skew rolling mill according to the invention, a measuring means is provided with which a change in the roll gap geometry and / or the roll gap displacement and / or the position of the work rolls in space and their change during the rolling operation can be determined. In this connection, it is particularly preferred if this measuring means is connected to an evaluation unit which is suitable for determining the disturbance variables to be compensated. In this way, a cross rolling mill is provided, which is capable of dynamically and permanently preferably to determine any change in the rolling process, for example, based on a measured stator expansion and the associated change in the arrangement of the work rolls and possibly the dome to each other. The measuring means may in principle be arranged at any point of the roll stand or of its built-in elements, wherein a However, an indirect measurement, for example on a guide element such as a Diescherscheibe or a guide shoe still allows a correlation on a correlation on a conclusion on the position of the work rolls or the individual guide elements in the stand under load rolling stand.
Besonders bevorzugt wird dabei, wenn das Messmittel eine optische Bilderfassungseinheit umfasst, wodurch ermöglicht wird, die Messeinheit entfernt vom Walzgerüst und den dort auf die Messeinheit andernfalls einwirkende und das Messergebnis störend beeinflussende Umständen zu trennen. Besonders bevorzugt wird, wenn das Messmittel eine Kamera, vorzugsweise eine CCD- Kamera, umfasst. Mittels einer derartigen Kamera kann die Messeinheit im Walzwerk nahezu beliebig zum Walzgerüst positioniert werden und gleichzeitig, gegebenenfalls nach einer entsprechenden Kalibrierung, sämtliche gewünschten Messergebnisse bereitstellen. In this case, it is particularly preferred if the measuring means comprises an optical image detection unit, which makes it possible to separate the measuring unit away from the rolling stand and the circumstances otherwise acting thereon on the measuring unit and interfering with the measurement result. It is particularly preferred if the measuring means comprises a camera, preferably a CCD camera. By means of such a camera, the measuring unit in the rolling mill can be positioned almost anywhere on the roll stand and at the same time, optionally after a corresponding calibration, provide all the desired measurement results.
Besonders bevorzugt wird in diesem Zusammenhang, wenn das Messmittel in der Lage ist, ein mit dem Walzgerüst verbundenes Bildelement, vorzugsweise ein oder mehrere mit den Anstellelementen für die Arbeitswalzen verbundeneParticularly preferred in this context, if the measuring means is capable of a connected to the rolling stand picture element, preferably one or more connected to the adjusting elements for the work rolls
Bildelemente, zu erfassen und dann in der Lage ist, deren Lage- und/oder Formveränderung während des Walzvorgangs zu ermitteln. Besonders bevorzugt wird in diesem Zusammenhang, wenn das wenigstens eine Bildelement ein aktiver Leuchtkörper ist, der in einer überaus bevorzugten Ausführungsform der Erfindung kreisrund und mit definiertem Durchmesser oder oval mit definierter Form ausgebildet ist. Ebenso bevorzugt wird, wenn das Bildelement quadratisch oder rechteckig ausgebildet ist, wobei dann beispielsweise die Bewertung der Veränderung einer oder mehrerer Bildelement-Diagonalen unter Last einen Flinweis auf die Walzgerüst-Aufdehnung oder -Verzerrung erlaubt. Hierdurch wird einerseits die Möglichkeit geschaffen, jede Walzgerüstdehnung und/oder -Verzerrung direkt und unmittelbar zu messen, andererseits wird durch die Ausgestaltung des Bildelements als aktiver Leuchtkörper die Bilderfassung mit besonders einfachen Mitteln vorteilhaft unterstützt. Schließlich wird durch die bevorzugte Ausgestaltung des Bildelements mit kreisrunder Form und definiertem Durchmesser oder oval mit vorab festgelegter Form oder quadratisch oder rechteckig mit bekannten Diagonalmaßen einerseits eine Kalibrierung der Messung mit besonders einfachen Mitteln unterstützt, andererseits auch die Möglichkeit geschaffen, nicht nur die Lageänderung des Bildelements während der Walzgerüstaufdehnung zu erfassen, sondern auch jede Formveränderung des Bildelements aufgrund jeder anderen Art von Verzerrung des Walzgerüsts. Dies wird dann besonders vorteilhaft nutzbar, wenn die optische Bilderfassung nicht nur den Mittelpunkt (bei kreisrunder Form) oder den Schnittpunkt der Hauptachsen (bei ovaler Form) oder den Schnittpunkt der Flächendiagonalen (bei quadratischer oder rechteckiger Form) eines Bildelements, sondern dessen gesamte Fläche, zumindest jedoch den Bildelementrand und dessen Mittelpunkt, zu erfassen in der Lage ist. Der Vorteil dieses Messverfahrens ist, dass die Möglichkeit geschaffen wird, zur Bestimmung eines einzelnen Punkts viele Punkte des flächigen Bildelements auswerten zu können. Dies reduziert die Störanfälligkeit gegenüber einer üblichen Lasermessung, die nur eine einzelne Punktbetrachtung erlaubt. Die Flächenbetrachtung erlaubt zudem eine einmalige Kalibrierung des Messgeräts unabhängig von ihrem Ort, die Position des Messgeräts kann somit frei gewählt und von einer Messung zur nächsten sogar bei bedarf verändert werden. Gemäß einem zweiten Aspekt der Erfindung wird ein Verfahren zum Herstellen eines Hohlblocks aus einem Block mittels eines Schrägwalzwerks zum Walzen eines Blocks über einem Dorn, besonders bevorzugt eines Schrägwalzwerks gemäß dem ersten Aspekt der Erfindung, zur Verfügung gestellt. Erfindungsgemäß verändern hydraulische Anstellelemente, vorzugsweise hydraulische Kapseln, die direkt oder indirekt mit den Arbeitswalzen, beispielsweise über Walzeneinbaustücke, verbunden sind, während des Walzvorgangs den Walzspalt, vorzugsweise auch die Ausrichtung der Walzenachse zumindest einer der Arbeitswalzen gegenüber dem Block. Hierdurch wird ein Verfahren zur Verfügung gestellt, welches erstmals ermöglicht, während des Walzvorgangs Veränderungen der Walzspaltgeometrie vorzunehmen und hierdurch etwaig ermittelten Störgrößen zum Zwecke der Qualitätssicherung oder -Optimierung des Walzvorgangs zu begegnen. Image elements to capture and then able to determine their position and / or shape change during the rolling process. In this connection, it is particularly preferred if the at least one picture element is an active luminous element which, in an extremely preferred embodiment of the invention, is circular and of defined diameter or oval with a defined shape. It is also preferred if the picture element is square or rectangular, for example, then the evaluation of the change of one or more picture element diagonals under load allows an indication of the rolling stand expansion or distortion. In this way, on the one hand, the possibility is created to measure each roll stand strain and / or distortion directly and directly, on the other hand, the image acquisition is advantageously supported by particularly simple means by the design of the picture element as an active light. Finally, the calibration of the measurement is supported by particularly simple means by the preferred embodiment of the pixel with circular shape and defined diameter or oval with predetermined shape or square or rectangular with known diagonal dimensions, on the other hand also created the possibility, not only the change in position of the pixel during roll stand stretch, but also any shape change of the pixel due to any other type of distortion of the roll stand. This can be used particularly advantageously if the optical image acquisition not only the center (in a circular shape) or the intersection of the major axes (oval shape) or the intersection of the surface diagonal (square or rectangular shape) of a pixel, but the entire surface, but at least the picture element edge and its center, is able to capture. The advantage of this measurement method is that the possibility is created to be able to evaluate many points of the two-dimensional image element in order to determine a single point. This reduces the susceptibility to interference with a conventional laser measurement, which allows only a single point observation. The area view also allows a one-time calibration of the meter regardless of their location, the position of the meter can thus be freely selected and changed from one measurement to the next even when needed. According to a second aspect of the invention, there is provided a method of making a block ingot by means of a cross rolling mill for rolling a block over a mandrel, more preferably a cross rolling mill according to the first aspect of the invention. According to the invention change hydraulic adjusting, preferably hydraulic capsules, which are directly or indirectly connected to the work rolls, for example via roll chocks, during the Rolling the nip, preferably also the orientation of the roll axis of at least one of the work rolls relative to the block. In this way, a method is provided, which makes it possible for the first time during the rolling process to make changes in the roll gap geometry and thereby counteract any determined disturbances for the purpose of quality assurance or optimization of the rolling process.
Besonders bevorzugt wird, wenn die Veränderung des Walzspalts, wie oben beschrieben, dann bewirkt wird, wenn von einer Auswerteeinheit vorab mittels gemessener Änderungen der Walzspaltgeometrie und/oder der Walzspaltverschiebung und/oder der Lage der Arbeitswalzen im Raum sowie deren Veränderung während des Walzbetriebs Störgrößen bestimmt worden sind. Besonders vorteilhaft wird dann im Zusammenwirken einer geeigneten Steuerungs- und Regeleinheit mit der Auswerteeinheit ein Signal zur Stellgrößenkompensation an die hydraulischen Anstellelemente ausgegeben. It is particularly preferred if the change in the roll gap, as described above, is effected if disturbances are determined by an evaluation unit in advance by means of measured changes in the roll gap geometry and / or the roll gap displacement and / or the position of the work rolls in space and their change during the rolling operation have been. In a particularly advantageous manner, in cooperation with a suitable control and regulating unit with the evaluation unit, a signal for the control variable compensation is output to the hydraulic setting elements.
Besonders bevorzugt wird in diesem Zusammenhang, wenn die Auswerteeinheit mit einem Messmittel, vorzugsweise einem vom Walzgerüst entfernt angeordneten optischen Messmittel, insbesondere einem Messmittel mit optischer Bilderfassungseinheit, verbunden ist. Dieses Messmittel kann in einer bevorzugten Ausführungsform der Erfindung ein mit dem Walzgerüst verbundenes Bildelement, vorzugsweise ein oder mehrere mit den Anstellelementen für die Arbeitswalzen verbundene Bildelemente, erfassen sowie deren Lage- und/oder Formveränderungen während des Walzvorgangs ermitteln. Die Bewegung der Bildelemente wird mittels des optischen Messmittels vorzugsweise hochgenau dynamisch erfasst, wobei die Änderungen Ax1 (t) und Ay1 (t) der oberen Arbeitswalze bzw. Ax2(t), Ay2(t) der unteren Arbeitswalze vorzugsweise online ermittelt und mittels der Auswerteeinheit an die Steuerungs- und Regelungseinheit zur Minimierung oder Kompensation der Stellgrößen übermittelt wird. Vorzugsweise werden dann online über geeignete Algorithmen neue Stellgrößen für die hydraulischen Anstellelemente der oberen Arbeitswalze und/oder der unteren Arbeitswalze errechnet und die jeweiligen Walzenpositionen so angepasst, dass der absolute Walzspaltfehler minimiert und die Symmetrie zur ursprünglichen Mitte wieder hergestellt werden kann. Hierdurch wird ein Verfahren zur Verfügung gestellt, welches mit einfachen und störunanfälligen sowie genauen und online verwendbaren Mitteln eine sehr genaue und hochdynamische Störgrößenkompensation erlaubt, wodurch erstmals während des Walzprozesses im Schrägwalzwerk ein Einfluss auf den derzeit laufenden Walzbetrieb ausgeübt werden kann In this connection, it is particularly preferred if the evaluation unit is connected to a measuring means, preferably an optical measuring means located remotely from the rolling stand, in particular a measuring means with an optical image detection unit. In a preferred embodiment of the invention, this measuring device can detect a picture element connected to the rolling stand, preferably one or more picture elements connected to the setting elements for the work rolls, and determine their position and / or shape changes during the rolling process. The movement of the picture elements is preferably detected with high precision by means of the optical measuring means, the changes Ax1 (t) and Ay1 (t) of the upper work roll or Ax2 (t), Ay2 (t) of the lower work roll preferably being determined online and by means of the evaluation unit is transmitted to the control and regulation unit for minimizing or compensating the manipulated variables. Preferably, then via suitable algorithms new manipulated variables for the hydraulic setting elements of the upper work roll and / or the lower work roll and the respective roll positions adjusted so that the absolute nip error can be minimized and the symmetry to the original center can be restored. In this way, a method is provided which allows with simple and störunanfälligen and accurate and usable online means a very accurate and highly dynamic Störgrößenkompensation, which for the first time during the rolling process in the cross rolling mill an influence on the currently ongoing rolling operation can be exercised
Hierzu ist es auch von Vorteil, wenn zusätzlich zur Position der Arbeitswalzen, vorzugsweise der oberen und/oder unteren Arbeitswalzen auch oder ausschließlich die Position und/oder Lage des Doms sowie zusätzlich hierzu oder unabhängig von anderen Änderungen die Position und/oder Lage der Diescherscheiben zum Block oder Hohlblock dynamisch verändert wird, um so die Kompensation vorab ermittelter Störgrößen zu bewirken oder zumindest zu unterstützen. For this purpose, it is also advantageous if in addition to the position of the work rolls, preferably the upper and / or lower work rolls also or exclusively the position and / or position of the dome and in addition to this or independent of other changes, the position and / or position of the Diescherscheiben for Block or hollow block is changed dynamically, so as to effect the compensation of previously determined disturbances or at least support.
Insgesamt ermöglicht die Erfindung gemäß beiden oben näher erläuterten Aspekten die dynamische Kompensation der Aufdehnung des Walzwerks beim Walzen und die Verringerung oder Eliminierung von Fehlern im durch das Schrägwalzwerk zu produzierenden Rohr. Die Messwerterfassung erfolgt vorzugsweise berührungslos und entfernt vom Walzgerüst, somit frei von den das Messergebnis störenden Einflüssen nahe des Walzspalts, und erlaubt eine höchstmögliche Flexibilität der Anordnung des Messmittels zum Walzgerüst je nach örtlichen Gegebenheiten. Während des Walzprozesses können Bewegungen des Walzgerüsts erfasst werden und bei folgenden Walzungen, gegebenenfalls auch während des laufenden Walzprozesses, ausgeglichen werden. Zur Erfassung der zur Kompensation erforderlichen Daten kann an mehreren Punkten gleichzeitig gemessen werden, das Messmittel kann zudem fest montiert aber auch mobil ausgestaltet sein. Für die Messung kann in einer überaus bevorzugten Weise eine optische Bilderfassung verwendet werden, die das Messgerät CaliView® verwendet. Diese kann Konturen aus einem Abstand von 8 m bis 40 m mit einer Genauigkeit von 0,1 mm vermessen, wobei CaliView® darüber hinaus über eine Serienbildfunktion zur Überprüfung der Messung verfügt. Overall, the invention according to both explained in more detail above allows the dynamic compensation of the expansion of the rolling mill during rolling and the reduction or elimination of errors in the pipe to be produced by the cross rolling mill. The data acquisition is preferably carried out without contact and removed from the rolling stand, thus free of the measurement result disturbing influences near the roll gap, and allows the highest possible flexibility of the arrangement of the measuring means to the rolling mill depending on local conditions. During the rolling process, movements of the roll stand can be detected and compensated during subsequent rolling, possibly also during the ongoing rolling process. In order to acquire the data required for the compensation, it is possible to measure at several points at the same time; in addition, the measuring means can be permanently mounted but also designed to be mobile. For the measurement, in an extremely preferred manner, an optical image acquisition can be used which uses the CaliView® measuring device. It can measure contours from a distance of 8 m to 40 m with an accuracy of 0.1 mm, with CaliView® also having a continuous scan function for checking the measurement.
Die Messung kann somit während des Walzvorgangs ermittelte Bewegungen des Walzgerüsts sowie daraus resultierende Veränderungen des Walzspalts und der Walzspaltgeometrie aufnehmen und während des Betriebs zur Nachjustierung der Arbeitswalzen oder anderer Stellgrößen verwenden. Durch die bevorzugt bekannte Form und Dimension des Bildelements auf dem Walzgerüst kann zudem bei der Anordnung des Messmittels in Relation zum Walzgerüst ein Winkelversatz vorgesehen sein, der dann bei der Kalibrierung des Messgeräts berücksichtigt werden sollte. Flierdurch kann der Einfluss der beim Schrägwalzprozess auftretenden Dämpfe und sonstigen das Messergebnis störenden Einflüsse auf das unvermeidbare Minimum beschränkt werden. The measurement can thus record during the rolling process movements of the roll stand and the resulting changes in the roll gap and the roll gap geometry and use during operation for readjustment of the work rolls or other manipulated variables. Due to the preferred known shape and dimension of the picture element on the roll stand can also be provided in the arrangement of the measuring means in relation to the rolling mill an angular offset, which should then be considered in the calibration of the meter. Flierdurch the influence of the vapors occurring during the cross rolling and other influences disturbing the measurement result can be limited to the unavoidable minimum.
5. Kurze Beschreibung der Figuren 5. Brief description of the figures
Die Erfindung wird nachfolgend unter Bezugnahme auf eine Reihe von zeichnerischen Darstellungen näher erläutert, wobei in diesen Figuren nur exemplarische und schematische Darstellungen der Erfindung angegeben sind. The invention will be explained in more detail below with reference to a number of drawings, wherein in these figures only exemplary and schematic representations of the invention are given.
Figur 1 zeigt eine schematische Ansicht eines Teils eines Schrägwalzwerks gemäß einer ersten Ausführungsform der Erfindung, FIG. 1 shows a schematic view of a part of a cross rolling mill according to a first embodiment of the invention,
Figur 2 zeigt eine schematische Darstellung eines Teils eines Figure 2 shows a schematic representation of a part of a
Schrägwalzwerks gemäß einer zweiten Ausführungsform der Slanting mill according to a second embodiment of the
Erfindung, und Invention, and
Figur 3 zeigt ein Ablaufschaubild zur Anwendung eines erfindungsgemäßen FIG. 3 shows a flow diagram for the application of a device according to the invention
Verfahrens.  Process.
6. Detaillierte Beschreibung der Figuren Figur 1 zeigt in einer ersten Ausführungsform die Wirkweise eines Schrägwalzwerks, umfassend eine obere Arbeitswalze 1 sowie eine untere Arbeitswalze 2. Die oberen und unteren Arbeitswalzen 1 , 2 sind in der Form zweier miteinander an ihrer großen Stirnfläche verbundener Kegelstümpfe ausgebildet und wirken bei der Umformung eines Blocks 3 in einer Richtung von links nach rechts (z-Richtung) in Figur 1 mit einem auf einer Dornstange 4 angeordneten Dorn 5 zusammen. Der Block 3 wird bei geeigneter Anstellung der oberen und unteren Arbeitswalzen 1 , 2 relativ zum Block 3 durch die Rotation der oberen und unteren Arbeitswalzen 1 , 2 um deren Längsachsen 1 a bzw. 2a durch den Walzspalt zwischen den oberen und unteren Arbeitswalzen 1 , 2 und über den Dorn 5 hinweg von der Eingangsseite 6 zur Ausgangsseite 7 befördert. An den jeweiligen Enden der oberen bzw. unteren Arbeitswalzen 1 , 2 sind hydraulische Anstellelemente 8a, 8b, sowie 9a, 9b angeordnet, über die die Lage der Arbeitswalzen 1 , 2 zueinander und in Bezug auf den Block 3 nahezu beliebig veränderbar ist, insbesondere in der dargestellten Weise in einer y-Richtung vertikal zur Walzrichtung. Durch die Vertikalverstellung der hydraulischen Anstellelemente 8a, 8b, 9a, 9b kann auch der Walzspalt zwischen den oberen und unteren Arbeitswalzen 1 , 2 zumindest sowohl in y-Richtung als auch in z-Richtung verändert werden. Figur 2 zeigt eine weitere Ausgestaltungsform eines wesentlichen Teils eines erfindungsgemäßen Walzwerks, umfassend eine obere Arbeitswalze 1 sowie eine untere Arbeitswalze 2, die jeweils eine Kegelstumpfform mit unstetem Mantelverlauf zeigt. Zwischen den oberen und unteren Arbeitswalzen 1 , 2 ist wiederum ein Walzspalt 10 ausgebildet, in den der Block 3 durch Bewegung in Richtung z auf den Dorn 5 hin eintritt und dort im Zusammenwirken der oberen und unteren Arbeitswalzen 1 , 2 mit dem örtlich feststehenden Lochdorn 5 zu einem (nicht dargestellten) Hohlblock umgeformt wird. An beiden Enden der oberen und unteren Arbeitswalzen 1 , 2 sind hydraulische Anstellelemente 8a, 8b bzw. 9a, 9b angeordnet, mittels derer eine Veränderung des Walzspalts 10 sowie der örtlichen Lage der Walzenachsen 1a, 1 b bewirkt werden kann 6. DETAILED DESCRIPTION OF THE FIGURES FIG. 1 shows, in a first embodiment, the mode of action of a bevelling mill comprising an upper work roll 1 and a lower work roll 2. The upper and lower work rolls 1, 2 are in the form of two truncated cones connected together at their large end face and act in the transformation of a block 3 in a direction from left to right (z-direction) in Figure 1 with a mandrel 4 arranged on a mandrel 5 together. The block 3 is at a suitable position of the upper and lower work rolls 1, 2 relative to the block 3 by the rotation of the upper and lower work rolls 1, 2 about their longitudinal axes 1 a and 2a through the nip between the upper and lower work rolls 1, 2nd and conveyed across the mandrel 5 from the input side 6 to the output side 7. At the respective ends of the upper and lower work rolls 1, 2 hydraulic adjusting 8a, 8b, and 9a, 9b are arranged, via which the position of the work rolls 1, 2 to each other and in relation to the block 3 is almost arbitrarily variable, in particular the manner shown in a y-direction vertical to the rolling direction. As a result of the vertical adjustment of the hydraulic setting elements 8a, 8b, 9a, 9b, the roll gap between the upper and lower work rolls 1, 2 can also be changed at least both in the y direction and in the z direction. Figure 2 shows another embodiment of an essential part of a rolling mill according to the invention, comprising an upper work roll 1 and a lower work roll 2, each showing a truncated cone shape with unsteady coat course. Between the upper and lower work rolls 1, 2, in turn, a nip 10 is formed, in which the block 3 enters by movement in the direction of z on the mandrel 5 and there in cooperation of the upper and lower work rolls 1, 2 with the locally fixed piercing pin fifth is converted to a (not shown) hollow block. At both ends of the upper and lower work rolls 1, 2 hydraulic adjusting elements 8a, 8b and 9a, 9b are arranged, by means of which a change of the roll gap 10 and the local position of the roll axes 1a, 1b can be effected
Figur 3 zeigt ein schematisches Ablaufdiagramm des erfindungsgemäßen Verfahrens mittels eines erfindungsgemäßen Schrägwalzwerks 11 , welches eine obere Arbeitswalze 1 sowie eine untere Arbeitswalze 2 trägt. Bildelemente MM1 und MM2 sind Walzenständer des Walzgerüsts 11 angeordnet und werden während des Walzbetriebs permanent hochgenau und dynamisch sowohl was ihre Lage als auch ihre Form angeht von einer entfernt angeordneten und bildlich nicht dargestellten Kamera überwacht. Jede Lageveränderung in x-Richtung und y- Richtung Dx1 (t), Ay1 (t) für die obere Arbeitswalze 1 sowie Dx2(t), Ay2(t) für die untere Arbeitswalze 2 werden von der (nicht dargestellten) Messeinheit erfasst und an eine (ebenfalls nicht dargestellte) Auswerteeinheit übermittelt. In dieser Auswerteeinheit wiederum wird ermittelt, ob die von der (nicht dargestellten) Bildeinheit erfassten Lageveränderungen der Bildelemente MM1 , MM2 als zu kompensierende Stellgrößen zu betrachten sind. Ist dies der Fall, werden die von der Auswerteeinheit bestimmten Störgrößen an den HGC-Regler als Steuerungs- und Regeleinheit (Hydraulic Gap Control-Regler) weitergeleitet. In die Steuerungs- und Regeleinheit (HGC) gehen weitere Prozessparameter ein, so dass auf Grundlage vorab festgelegter Algorithmen Steuerbefehle Y1 , Y2 an die hydraulischen Anstellelemente 8, 9 ausgegeben werden. Diese hydraulischen Anstellelemente 8, 9 verändern durch Verstellung der oberen Arbeitswalze 1 und/oder der unteren Arbeitswalze 2 gegenüber dem (nicht dargestellten) Dorn die Walzspaltgeometrie sowie gegebenenfalls die Ausrichtung der (nicht dargestellten) Walzenachsen zueinander. Hierdurch wird ermöglicht, während des Walzvorgangs hochdynamisch unter ständiger Erfassung und Bewertung von Messdaten online Steuer- und Regelbefehle auszugeben, die in der Lage sind, das Walzergebnis und den Verlauf des Schrägwalzprozesses positiv zu beeinflussen. FIG. 3 shows a schematic flow diagram of the method according to the invention by means of a skew rolling mill 11 according to the invention, which carries an upper work roll 1 and a lower work roll 2. Image elements MM1 and MM2 are arranged roll stand of the roll stand 11 and are permanently monitored during the rolling operation with high precision and dynamically both in terms of their location and their form of a remote and not pictorially illustrated camera. Each change of position in the x-direction and y-direction Dx1 (t), Ay1 (t) for the upper work roll 1 and Dx2 (t), Ay2 (t) for the lower work roll 2 are detected by the (not shown) measuring unit and on a (also not shown) transmitted evaluation. In turn, it is determined in this evaluation unit whether the positional changes of the picture elements MM1, MM2 detected by the image unit (not shown) are to be regarded as correcting variables to be compensated. If this is the case, the disturbances determined by the evaluation unit are forwarded to the HGC controller as a control and regulation unit (hydraulic gap control controller). In the control unit (HGC) enter further process parameters, so that on the basis of predetermined algorithms control commands Y1, Y2 are output to the hydraulic Anstellelemente 8, 9. These hydraulic adjusting elements 8, 9 change by adjusting the upper work roll 1 and / or the lower work roll 2 with respect to the (not shown) mandrel the roll gap geometry and optionally the orientation of the (not shown) roll axes to each other. This makes it possible to output during the rolling process highly dynamic with constant detection and evaluation of measurement data online control and regulation commands that are able to positively influence the rolling result and the course of the cross rolling process.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Arbeitswalze 1 stripper
1 a, b Walzenachse 1 a, b roll axis
2 Arbeitswalze  2 stripper
2a, b Walzenachse  2a, b roll axis
3 Block  3 block
5 Dorn  5 thorn
8 Anstellelement8 setting element
8a, 8b Anstellelement8a, 8b Anstellelement
9 Anstellelement9 setting element
9a, 9b Anstellelement9a, 9b adjusting element
10 Walzspalt 10 rolling gap
1 1 Schrägwalzwerk 1 1 cross rolling mill
HGC Hydraulic Gap ControlHGC Hydraulic Gap Control
MM1 Bildelement MM1 picture element
MM2 Bildelement MM2 picture element

Claims

Patentansprüche claims
1 Schrägwalzwerk (11 ) zum Walzen eines Blocks (3) über einem Dorn (5) zu einem Hohlblock, umfassend eine Mehrzahl von Arbeitswalzen (1 , 2), die jeweils eine im Wesentlichen radial gerichtete Walzkraft auf den Block (3) ausüben, wobei die Arbeitswalzen (1 , 2) in einem Walzgerüst getragen sind und der Walzspalt (10) zwischen den Arbeitswalzen (1 , 2), vorzugsweise auch die Ausrichtung der Walzenachse (1 a, 2a) zumindest einer der Arbeitswalzen (1 , 2) gegenüber dem Block (3), veränderbar ist, dadurch gekennzeichnet, dass hydraulische Anstellelemente (8, 9), vorzugsweise hydraulische Kapseln, dafür vorgesehen sind, die Veränderung des Walzspalts (10), vorzugsweise auch die Ausrichtung der Walzenachse (1a, 2a) zumindest einer der Arbeitswalzen (1 , 2) gegenüber dem Block (3), zu bewirken. A cross rolling mill (11) for rolling a block (3) over a mandrel (5) into a hollow block comprising a plurality of work rolls (1, 2) each applying a substantially radially directed rolling force to the block (3) the work rolls (1, 2) are carried in a roll stand and the roll gap (10) between the work rolls (1, 2), preferably also the orientation of the roll axis (1a, 2a) at least one of the work rolls (1, 2) relative to the Block (3) is variable, characterized in that hydraulic adjusting elements (8, 9), preferably hydraulic capsules, are provided for the change of the roll gap (10), preferably also the orientation of the roll axis (1a, 2a) at least one of Work rolls (1, 2) relative to the block (3) to effect.
2 Schrägwalzwerk (11 ) gemäß Anspruch 1 , dadurch gekennzeichnet, dass die hydraulischen Anstellelemente (8 ,9) in der Lage sind, eine Walzgerüst- Ausdehnung während des Walzbetriebs durch Veränderung der Anstellung der Arbeitswalzen (1 , 2) zueinander, vorzugsweise zudem durch Ausrichtung der Walzenachse (1 a, 2a) zumindest einer der Arbeitswalzen (1 , 2) gegenüber dem Block (3), auszugleichen. 2 skewing rolling mill (11) according to claim 1, characterized in that the hydraulic adjusting elements (8, 9) are capable of a roll stand expansion during the rolling operation by changing the employment of the work rolls (1, 2) to each other, preferably also by alignment the roller axis (1 a, 2 a) at least one of the work rolls (1, 2) relative to the block (3), compensate.
3 Schrägwalzwerk (11 ) gemäß einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass zusätzlich zu den Arbeitswalzen (1 , 2) seitlich den Walzspalt (10) begrenzende Scheiben, sog. Diescherscheiben und/oder Führungsschuhe, vorgesehen sind, die vorzugsweise ebenfalls mit hydraulischen Anstellelementen verbunden sind. 3 skewing rolling mill (11) according to one of the preceding claims, characterized in that in addition to the work rolls (1, 2) laterally the roll gap (10) limiting discs, so-called. Diescherscheiben and / or guide shoes, are provided, which preferably also with hydraulic adjusting elements are connected.
4. Schrägwalzwerk (11 ) gemäß einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass zusätzlich ein Messmittel vorgesehen ist, mit dem eine Veränderung der Walzspaltgeometrie und/oder Walzspaltverschiebung und/oder der Lage der Arbeitswalzen (1 , 2) im Raum sowie deren Veränderung während des Walzbetriebs bestimmbar ist. 4. beveling mill (11) according to one of the preceding claims, characterized in that in addition a measuring means is provided, with a change in the roll gap geometry and / or roll gap displacement and / or the position of the work rolls (1, 2) in space and their change during of the rolling operation is determinable.
5. Schrägwalzwerk (11 ) gemäß Anspruch 4, dadurch gekennzeichnet, dass das Messmittel mit einer Auswerteeinheit verbunden ist, die dazu geeignet ist, Störgrößen zu ermitteln. 5. beveling mill (11) according to claim 4, characterized in that the measuring means is connected to an evaluation unit which is adapted to determine disturbance variables.
6. Schrägwalzwerk (11 ) gemäß voranstehenden Ansprüche, dadurch gekennzeichnet, dass eine Steuerungs- und Regeleinheit (HGC) vorgesehen ist, die mit den hydraulischen Anstellelementen (8, 9) so verbunden ist, dass vorab ermittelten Änderungen der Walzspaltgeometrie und/oder Walzspaltverschiebung und/oder der Lage der Arbeitswalzen (1 ,6. beveling mill (11) according to the preceding claims, characterized in that a control and regulating unit (HGC) is provided, which is connected to the hydraulic Anstellelementen (8, 9), that previously determined changes in the roll gap geometry and / or roll gap displacement and / or the position of the work rolls (1,
2) im Raum sowie deren Veränderung während des Walzbetriebs durch Veränderung des Walzspalts (10), vorzugsweise auch der Ausrichtung der Walzenachse (1a, 1 b) zumindest einer der Arbeitswalzen (1 , 2) gegenüber dem Block (3), entgegengewirkt werden kann. 2) in the room and their change during the rolling operation by changing the roll gap (10), preferably also the orientation of the roll axis (1a, 1b) at least one of the work rolls (1, 2) relative to the block (3), can be counteracted.
7. Schrägwalzwerk (11 ) gemäß Anspruch 6, dadurch gekennzeichnet, dass die Steuerungs- und Regeleinheit (HGC) mit der Auswerteeinheit gemäß Anspruch 4 verbunden ist. 7. helical rolling mill (11) according to claim 6, characterized in that the control and regulation unit (HGC) is connected to the evaluation unit according to claim 4.
8. Schrägwalzwerk (11 ) gemäß einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass das Messmittel eine optische Bilderfassungseinheit umfasst. 8. A cross rolling mill (11) according to any one of claims 4 to 7, characterized in that the measuring means comprises an optical imaging unit.
9. Schrägwalzwerk (11 ) gemäß einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass das Messmittel in der Lage ist, ein mit dem9. slanting mill (11) according to one of claims 4 to 8, characterized in that the measuring means is capable of one with the
Walzgerüst verbundenes Bildelement (MM1 , MM2), vorzugsweise ein oder mehrere mit den Anstellelementen (8, 9) für die Arbeitswalzen (1 , 2) verbundene Bildelemente (MM1 , MM2), zu erfassen sowie dessen oder deren Lage- und/oder Formveränderung zu ermitteln. Roll stand connected image element (MM1, MM2), preferably one or a plurality of with the adjusting elements (8, 9) for the work rolls (1, 2) associated image elements (MM1, MM2) to detect and to determine its or their position and / or shape change.
10. Schrägwalzwerk (11 ) gemäß Anspruch 9, dadurch gekennzeichnet, dass das wenigstens eine Bildelement (MM1 , MM2) ein aktiver Leuchtkörper ist. 10. Slanting mill (11) according to claim 9, characterized in that the at least one picture element (MM1, MM2) is an active filament.
11. Schrägwalzwerk (11 ) gemäß einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass das Bildelement (MM1 , MM2) kreisrund mit definiertem Durchmesser, oder quadratisch oder rechteckig mit bekannten11. A cross rolling mill (11) according to any one of claims 8 or 9, characterized in that the picture element (MM1, MM2) circular with a defined diameter, or square or rectangular with known
Diagonalmaßen, oder oval mit definitiver Form ist. Diagonal measurements, or oval with definite shape.
12. Schrägwalzwerk (11 ) gemäß voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Position des Doms (5) innerhalb des Walzspalts (10) veränderbar ist. 12. beveling mill (11) according to the preceding claims, characterized in that the position of the dome (5) within the roll gap (10) is variable.
13. Verfahren zum Herstellen eines Hohlblocks aus einem Block (3) mittels eines Schrägwalzwerks (11 ) zum Walzen eines Blocks (3) über einem Dorn (5), wobei das Schrägwalzwerk (11 ) eine Mehrzahl von Arbeitswalzen (1 , 2) umfasst, die jeweils eine im Wesentlichen radial gerichtete Walzkraft auf den Block (3) ausüben, wobei die Arbeitswalzen (1 , 2) in einem Walzgerüst getragen sind und der Walzspalt (10) zwischen den Arbeitswalzen (1 , 2), vorzugsweise auch die Ausrichtung der Walzenachse (1 a, 2a) zumindest einer der Arbeitswalzen (1 , 2) gegenüber dem Block (3), veränderbar ist, dadurch gekennzeichnet, dass während des Walzvorgangs hydraulische Anstellelemente (8, 9), vorzugsweise hydraulische Kapseln, die Veränderung des Walzspalts (10), vorzugsweise auch die Ausrichtung der Walzenachse zumindest einer derMethod for producing a hollow block from a block (3) by means of a cross rolling mill (11) for rolling a block (3) over a mandrel (5), the cross rolling mill (11) comprising a plurality of work rolls (1, 2), each having a substantially radially directed rolling force on the block (3), wherein the work rolls (1, 2) are carried in a rolling stand and the nip (10) between the work rolls (1, 2), preferably also the orientation of the roll axis (1 a, 2 a) at least one of the work rolls (1, 2) relative to the block (3), is variable, characterized in that during the rolling process hydraulic adjusting elements (8, 9), preferably hydraulic capsules, the change of the roll gap (10 ), preferably also the orientation of the roll axis of at least one of
Arbeitswalzen gegenüber dem Block, verändern. Work rolls opposite the block, change.
14. Verfahren gemäß Anspruch 13, dadurch gekennzeichnet, dass die Veränderung des Walzspalts (10), vorzugsweise auch die Ausrichtung der Walzenachse (1a, 2a) zumindest einer der Arbeitswalzen (1 , 2) gegenüber dem Block (3), dann bewirkt wird, wenn von einer Auswerteeinheit vorab mittels eines Messmittels gemessene Änderungen der Walzspaltgeometrie und/oder Walzspaltverschiebung und/oder der Lage der Arbeitswalzen (1 , 2) im Raum sowie deren Veränderung während des Walzbetriebs, ermittelt und als Störgrößen eingeordnet worden sind. 14. The method according to claim 13, characterized in that the change of the roll gap (10), preferably also the alignment of the roll axis (1a, 2a) of at least one of the work rolls (1, 2) relative to the block (3), then causes if changes in the roll gap geometry and / or roll gap displacement and / or the position of the work rolls (1, 2) in the room and their change during the rolling operation measured by an evaluation unit beforehand have been determined and classified as disturbance variables.
15. Verfahren gemäß Anspruch 14, dadurch gekennzeichnet, dass eine15. The method according to claim 14, characterized in that a
Steuerungs- und Regeleinheit (HGC) mit der Auswerteeinheit verbunden ist und Signale zur Störgrößenkompensation an die hydraulischen Anstellelemente (8, 9) ausgibt. Control unit (HGC) is connected to the evaluation unit and outputs signals for Störgrößenkompensation to the hydraulic adjusting elements (8, 9).
16. Verfahren gemäß einem der Ansprüche 14 oder 15, dadurch gekennzeichnet, dass die Auswerteeinheit mit einem Messmittel, vorzugsweise einem vom Walzgerüst entfernt angeordneten optischen Messmittel, insbesondere einem Messmittel mit optischer Bilderfassungseinheit, verbunden ist. 16. The method according to any one of claims 14 or 15, characterized in that the evaluation unit with a measuring means, preferably a remote from the mill stand arranged optical measuring means, in particular a measuring means with optical imaging unit is connected.
17. Verfahren gemäß Anspruch 16, dadurch gekennzeichnet, dass das17. The method according to claim 16, characterized in that the
Messmittel eine mit dem Walzgerüst verbundenes Bildelement, vorzugsweise ein oder mehrere mit den Anstellelementen (8, 9) für die Arbeitswalzen (1 , 2) verbundene Bildelemente (MM1 , MM2), erfasst sowie dessen oder deren Lage- und/oder Formveränderung während des Walzvorgangs ermittelt. Measuring means a connected to the rolling mill picture element, preferably one or more with the Anstellelementen (8, 9) for the work rolls (1, 2) connected image elements (MM1, MM2) detected, and its or their position and / or shape change during the rolling process determined.
18. Verfahren gemäß einem der Ansprüche 14 bis 17, dadurch gekennzeichnet, dass die Lage und/oder Ausrichtung des Doms (5) innerhalb des Walspalts (10) während des Walzvorgangs zur Kompensation vorab ermittelter Störgrößen verändert wird. 18. The method according to any one of claims 14 to 17, characterized in that the position and / or orientation of the mandrel (5) within the Walspalts (10) during the rolling process to compensate for previously determined disturbances is changed.
19. Verfahren gemäß einem der Ansprüche 12 bis 18, dadurch gekennzeichnet, dass es mit einem Schrägwalzwerk (11 ) gemäß einem der Ansprüche 1 bis19. The method according to any one of claims 12 to 18, characterized in that it comprises a cross rolling mill (11) according to one of claims 1 to
12 durchgeführt wird. 12 is performed.
EP19719287.5A 2018-04-27 2019-04-24 Cross-rolling mill with hydraulic roller actuator Active EP3784423B1 (en)

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See also references of WO2019206958A1

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ES2932865T3 (en) 2023-01-27
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