EP2994572A1 - Roll - Google Patents

Roll

Info

Publication number
EP2994572A1
EP2994572A1 EP14709275.3A EP14709275A EP2994572A1 EP 2994572 A1 EP2994572 A1 EP 2994572A1 EP 14709275 A EP14709275 A EP 14709275A EP 2994572 A1 EP2994572 A1 EP 2994572A1
Authority
EP
European Patent Office
Prior art keywords
coating
roll
roller
roller according
roll shell
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
EP14709275.3A
Other languages
German (de)
French (fr)
Other versions
EP2994572B1 (en
Inventor
Alexander Etschmaier
Franz Grohmann
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.)
Voith Patent GmbH
Original Assignee
Voith Patent 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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2994572A1 publication Critical patent/EP2994572A1/en
Application granted granted Critical
Publication of EP2994572B1 publication Critical patent/EP2994572B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0246—Hard rolls

Definitions

  • the invention relates to a roller, in particular for use in a machine for producing and / or refining a fibrous web, such as a paper, board or tissue web, according to the preamble of claim 1.
  • rollers are available in a variety of positions and with a variety of functions in the above-mentioned machines.
  • rolls with soft cover layers are suitable for pressing and dewatering the fibrous web.
  • rollers with hard surfaces in particular also with a heating device, are mainly used for smoothing and drying.
  • a roller with a coating of a metal oxide is known, for example, from EP 0870867 B1.
  • the ceramic layer has 50 to 95% and preferably 55 to 80% of Cr 2 O 3 and 3 to 50% and preferably 20 to 45% of ⁇ 2 and possibly other metal oxides.
  • the sole input of energy into the material to be applied and a cooling rate of up to 10 6 K / s merely lead to a mechanical connection or clamping of the raw material to the roll core.
  • a careful preparatory surface treatment such as sandblasting and the like is needed, which is complicated and time-consuming.
  • the coating structure is closed in a porous state up to open porosity.
  • the porosity can lead to increased corrosion tendency and adhesion problems. Accordingly, the surface of the sprayed layer must be filled, for example by final sealing with a polymer.
  • thermal spraying due to the poor efficiency of the order powder powder with respect to the ⁇ per stroke and the percentage of remaining on the roller powder is not an economical and no ecological process.
  • the object is achieved by the characterizing features of claim 1 in combination with the generic features.
  • a coating of a metallic, ceramic and / or a cermet material is present or at least partially comprises such, wherein an alloy region is formed between the roll shell and the coating.
  • the alloy region has a thickness of 0.5 to 3%, preferably 1%, of the layer thickness of the coating.
  • a metallurgical bond between the material and the material of the roll shell can exist in the alloy region.
  • the coating may preferably be made using an inductive device, a plasma gun or a laser.
  • the material may be in powder, rod or wire form.
  • the coating may comprise at least one layer produced by a single stroke, or preferably several layers generated by several strokes.
  • Fig. 2 is a highly schematic representation of the order of a coating according to the invention.
  • FIG. 1 for ease of orientation, a thermal spray coating according to the prior art (FIG. 1A) is compared with a coating (FIG. 1B) produced according to the invention by laser cladding.
  • roller coating can range from “only wear-resistant” to “only corrosion-resistant”. Common to all positions, however, is the requirement for good adhesion of the roll coating on the roll core.
  • the above-mentioned disadvantages can be alleviated by an improved adhesion of the coating to the roll core to the effect that the connection of the coating material is not based on a purely mechanical clamping, but on a metallurgical bond.
  • the improved adhesion with a reduced porosity of the coating can also increase the corrosion resistance compared to a conventional thermal spray coating.
  • FIG. 1A a section of a roll 1 with a conventional thermal spray layer 2 is strong shown schematized cut.
  • the spray layer 2 is applied to a roller body 3, which consists of metal, preferably of steel.
  • the sprayed layer 2 of metallic, ceramic or cermet materials may at least partially exist.
  • the connection of the materials to the roll shell 3 is effected only by a mechanical or positive clamping of the molten particles on the material of the correspondingly prepared roll shell 3.
  • the interface 4 thus formed has seen in the radial direction no significant expansion. The attachment is thus limited.
  • corrosion by infiltration of water and punctual mechanical overloads such as the passage of a foreign body through a nip between two rollers 1 is thus to be expected that the sprayed layer 2 partially dissolves the roll shell 3. This can lead to endangerment of the operating personnel and damage to subsequent machine parts.
  • FIG. 1B in the same view as FIG. 1A, a cross-section through a coating 5 produced according to the invention by laser cladding is shown.
  • the connection of the materials which are built up to the coating 5, to the surface of the roll shell 3, is present here to an increased extent, since the energy input is higher overall and not only melted the materials, but also thermal energy in the surface of the roll shell 3 is entered.
  • Characterized the roll shell 3 is melted to a small extent, so that the material which is applied by a suitable applicator, can alloy into the material of the roll shell and thus enters into a metallurgical connection with the material of the roll shell 3.
  • the kinetic energy thus hardly contributes to the coating process, in contrast to thermal spraying.
  • an alloy region 6 constitutes about 0.1 to 3%, preferably 1% of the layer thickness of the coating 5 to be built up. This is to be regarded as positive in view of the likewise known process of build-up welding. On the one hand, the alloy region 6 is smaller, so that a finer processing of the materials is possible, which improves the surface quality of the coating 5 and reduces subsequent work steps.
  • the coating 5 produced by the laser cladding is usually produced in several strokes, wherein an alloy region also arises between the layers of the individual strokes, since each time the underlying region is remelted and alloyed with the further layer lying thereon. This in turn results in increased adhesion and corrosion resistance.
  • FIG. 2 shows a highly schematic view of the structure of a coating 5 on a roll 1.
  • the roller 1 is rotatably mounted and is suitably driven so that it rotates away under a preferably axially displaceable along the roller 1 application device 7. Thereby, the entire surface of the roll 1 can be coated in a continuous spiral line in at least one or more strokes.
  • the application device 7 essentially comprises a material supply 8 and an energy source 9, in which the usually powdery material is introduced.
  • energy source 9 inductive and plasma-generating devices and lasers of various types such as CO2 laser, HDPL (High Power Diode Laser) or DDL (Direct Diode Laser) are conceivable.
  • the construction of a coating 5 by means of laser cladding represents the most technologically feasible variant.
  • a major economic advantage of the process is the high separation efficiency compared to thermal coatings with increased layer thickness per stroke ( ⁇ / pass).

Landscapes

  • Coating By Spraying Or Casting (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

The invention relates to a roll (1) for use in a machine for the production and/or further processing of a fibrous web, such as a paper-, paperboard-, or tissue web, said roll comprising a roll cover (3), at least some sections of which consist of a metal material and which comprises a coating (5) formed on the cover. The coating (5) consists of a metal-, ceramic- and/or cermet material, or at least some sections of said coating comprise one of said materials, an alloy region (6) being situated between the roll cover (3) and the coating (5).

Description

Walze  roller
Die Erfindung geht aus von einer Walze insbesondere zur Verwendung in einer Maschine zur Herstellung und/oder Veredelung einer Faserstoffbahn wie einer Papier-, Karton- oder Tissuebahn nach dem Oberbegriff von Anspruch 1 . The invention relates to a roller, in particular for use in a machine for producing and / or refining a fibrous web, such as a paper, board or tissue web, according to the preamble of claim 1.
Derartige Walzen sind in einer Vielzahl von Positionen und mit einer Vielzahl von Funktionen in den oben genannten Maschinen vorhanden. So sind Walzen mit weichen Bezugsschichten zum Pressen und Entwässern der Faserstoffbahn geeignet, Walzen mit harten Oberflächen insbesondere auch mit einer Heizvorrichtung kommen vor allem zum Glätten und Trocknen zur Anwendung. Such rollers are available in a variety of positions and with a variety of functions in the above-mentioned machines. Thus, rolls with soft cover layers are suitable for pressing and dewatering the fibrous web. Rollers with hard surfaces, in particular also with a heating device, are mainly used for smoothing and drying.
Die letztgenannten Walzen sind dabei früher vielfach aus Granit hergestellt und mit hoher Güte geschliffen worden. Neuere Konzepte sahen Stahlwalzen vor, welche ebenfalls poliert wurden. Da diese Walzen allesamt verschiedene Nachteile wie beispielsweise das hohe Gewicht im Fall der Granitwalzen oder die Anfälligkeit für Korrosion im Fall der Stahlwalzen aufweisen, setzten sich mit der Zeit neue Verfahren zum Beschichten von Walzenkörpern aus Stahl oder aus Verbundwerkstoffen durch, welche eine metallische, keramische oder Cermet-Spritzschicht mittels Verfahren wie HVOF- oder Flammspritzen auf dem Walzenkörper ausbilden. Derartige Walzen sind seit längerer Zeit bekannt und bilden den derzeitigen Stand der Technik beispielsweise bei Zentralpresswalzen, Trockenzylindern und Leitwalzen. Der Prozess des thermischen Beschichtens sieht dabei vor, dass Pulver oder Drähte mittels Eintrags von thermischer Energie erschmolzen und auf den zu beschichtenden Walzenkern kinetisch beschleunigt. Die Eigenschaften und Möglichkeiten der Spritzprozesse sind im Wesentlichen von dem Verhältnis der kinetischen zur thermischen Energie gegeben. The latter rolls are often made in the past many times from granite and ground with high quality. Newer concepts provided for steel rolls, which were also polished. Since these rollers all have various disadvantages such as the high weight in the case of granite rolls or the susceptibility to corrosion in the case of steel rolls, new processes for coating roll bodies of steel or composites comprising a metallic, ceramic or composite material have been established over time Form cermet sprayed coating on the roll body by means such as HVOF or flame spraying. Such rolls have been known for some time and form the current state of the art, for example in central press rolls, drying cylinders and guide rolls. The process of thermal coating provides that powder or wires are melted by the introduction of thermal energy and accelerated kinetically on the roll core to be coated. The properties and possibilities of the injection processes are essentially given by the ratio of kinetic to thermal energy.
Eine Walze mit einer Beschichtung aus einem Metalloxid ist beispielsweise aus der EP 0870867 B1 bekannt. Dort wird eine Walze für eine Papiermaschine, Kartonmaschine oder eine Finishing-Maschine mit einer keramischen Lage in einer Dicke von 100 bis 2000 μητι beschrieben, die auf die Oberfläche der Walze aufgetragen wird, wobei die Rauhigkeit Ra der Außenfläche der Walze 0,2 bis 2,0 μητι und vorzugsweise 0,4 bis 1 ,5 μητι beträgt. Die keramische Lage weist 50 bis 95 % und vorzugsweise 55 bis 80 % an Cr2O3 und 3 bis 50 % und vorzugsweise 20 bis 45 % an ΤΊΟ2 und möglicherweise andere Metalloxide auf. A roller with a coating of a metal oxide is known, for example, from EP 0870867 B1. There is a roller for a paper machine, Board machine or a finishing machine with a ceramic layer in a thickness of 100 to 2000 μητι described, which is applied to the surface of the roller, wherein the roughness Ra of the outer surface of the roller 0.2 to 2.0 μητι and preferably 0.4 to 1, 5 μητι amounts. The ceramic layer has 50 to 95% and preferably 55 to 80% of Cr 2 O 3 and 3 to 50% and preferably 20 to 45% of ΤΊΟ 2 and possibly other metal oxides.
Die bekannten Verfahren sowie die dadurch erzeugbaren metallischen, keramischen oder Cermet-Beschichtungen sind dabei mit diversen Nachteilen behaftet. The known processes and the metallic, ceramic or cermet coatings which can be produced thereby are associated with various disadvantages.
Einerseits kommt es durch den alleinigen Energieeintrag in das aufzubringende Material und eine Abkühlgeschwindigkeit bis zu 106 K/s lediglich zu einer mechanischen Verbindung bzw. Verklammerung des Rohstoffs auf dem Walzenkern. Um diese Verklammerung so effektiv wie möglich zu gestalten, ist eine sorgfältige vorbereitende Oberflächenbehandlung wie Sandstrahlen und dergleichen vonnöten, welche aufwendig und zeitintensiv ist. On the one hand, the sole input of energy into the material to be applied and a cooling rate of up to 10 6 K / s merely lead to a mechanical connection or clamping of the raw material to the roll core. To make this clamping as effective as possible, a careful preparatory surface treatment such as sandblasting and the like is needed, which is complicated and time-consuming.
Andererseits ist die Beschichtungsstruktur je nach Material und/oder Herstellungsprozess geschlossen porös bis hin zu offener Porosität. Die Porosität kann zu erhöhter Korrosionsneigung und zu Haftungsproblemen führen. Entsprechend muss die Oberfläche der Spritzschicht beispielsweise durch abschließende Versiegelung mit einem Polymer verfüllt werden. On the other hand, depending on the material and / or manufacturing process, the coating structure is closed in a porous state up to open porosity. The porosity can lead to increased corrosion tendency and adhesion problems. Accordingly, the surface of the sprayed layer must be filled, for example by final sealing with a polymer.
Des Weiteren ist thermisches Spritzen aufgrund der schlechten Auftragseffizienz des Pulvers hinsichtlich der μιτι pro Hub und dem Prozentanteil des auf der Walze verbleibenden Pulvers kein ökonomisches und auch kein ökologisches Verfahren. Furthermore, thermal spraying due to the poor efficiency of the order powder powder with respect to the μιτι per stroke and the percentage of remaining on the roller powder is not an economical and no ecological process.
Es ist dementsprechend Aufgabe der Erfindung, eine Walze anzugeben, deren Beschichtung hinsichtlich ihrer Haftung am Walzenkern und ihrer Korrosionsbeständigkeit den Anforderungen genügt, die durch Papier-, Karton- oder Tissuemaschinen hinsichtlich Temperaturen, Feuchtigkeit und Belastung durch Chemikalien gestellt werden. Die Aufgabe wird gelöst durch die kennzeichnenden Merkmale von Anspruch 1 in Kombination mit den gattungsbildenden Merkmalen. Erfindungsgemäß ist dabei vorgesehen, dass eine Beschichtung aus einem metallischen, keramischen und/oder einem Cermet-Werkstoff vorhanden ist oder einen solchen zumindest bereichsweise umfasst, wobei zwischen dem Walzenmantel und der Beschichtung ein Legierungsbereich ausgebildet ist. Weitere vorteilhafte Ausgestaltungsvarianten und Aspekte der Erfindung gehen aus den Unteransprüchen hervor. It is accordingly an object of the invention to provide a roller whose coating satisfies the requirements of its adhesion to the roll core and its corrosion resistance, which are made by paper, board or tissue machines in terms of temperature, humidity and exposure to chemicals. The object is achieved by the characterizing features of claim 1 in combination with the generic features. According to the invention, it is provided that a coating of a metallic, ceramic and / or a cermet material is present or at least partially comprises such, wherein an alloy region is formed between the roll shell and the coating. Further advantageous embodiments and aspects of the invention will become apparent from the dependent claims.
Bevorzugt kann vorgesehen sein, dass der Legierungsbereich eine Stärke von 0,5 bis 3%, vorzugsweise von 1 % der Schichtstärke der Beschichtung aufweist. It can preferably be provided that the alloy region has a thickness of 0.5 to 3%, preferably 1%, of the layer thickness of the coating.
Gemäß einem vorteilhaften Aspekt der Erfindung kann in dem Legierungsbereich eine metallurgische Verbindung zwischen dem Werkstoff und dem Material des Walzenmantels bestehen. Die Beschichtung kann bevorzugt unter Verwendung einer induktiven Vorrichtung, einer Plasmakanone oder eines Lasers hergestellt sein. According to an advantageous aspect of the invention, a metallurgical bond between the material and the material of the roll shell can exist in the alloy region. The coating may preferably be made using an inductive device, a plasma gun or a laser.
Vorteilhafterweise kann der Werkstoff in Pulverform, in Stabform oder als Draht vorliegen. Advantageously, the material may be in powder, rod or wire form.
Gemäß vorteilhafter Aspekte der Erfindung kann die Beschichtung zumindest eine Schicht, die durch einen einzelnen Hub erzeugt ist, oder bevorzugt mehrere Schichten, die durch mehrere Hübe erzeugt sind, aufweisen. Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnungen ohne Einschränkung der Allgemeinheit näher beschrieben. In den Figuren zeigen: Fig. 1A-1 Beine stark schematisierte geschnittene Ansicht durch eine thermische Spritzschicht und eine erfindungsgemäße Beschichtung, und According to advantageous aspects of the invention, the coating may comprise at least one layer produced by a single stroke, or preferably several layers generated by several strokes. The invention will be described in more detail below with reference to the drawings without limiting the generality. In the figures show: Fig. 1A-1 legs highly schematic sectional view through a thermal spray coating and a coating according to the invention, and
Fig. 2 eine stark schematisierte Darstellung des Auftrags einer erfindungsgemäßen Beschichtung. Fig. 2 is a highly schematic representation of the order of a coating according to the invention.
In Fig. 1 ist zur leichteren Orientierung eine thermische Spritzschicht gemäß dem Stand der Technik (Fig. 1A) einer erfindungsgemäß durch Laser Cladding erzeugten Beschichtung (Fig. 1 B) gegenübergestellt. In FIG. 1, for ease of orientation, a thermal spray coating according to the prior art (FIG. 1A) is compared with a coating (FIG. 1B) produced according to the invention by laser cladding.
Die grundsätzliche Aufgabe einer Walzenbeschichtung kann je nach Position in der Papier-, Karton- oder Tissuemaschine von„nur verschleißbeständig" bis hin zu„nur korrosionsbeständig" reichen. Allen Positionen gemein jedoch ist die Forderung nach guter Haftung der Walzenbeschichtung am Walzenkern. Die weiter oben angeführten Nachteile können durch eine verbesserte Haftung der Beschichtung am Walzenkern dahingehend gemildert werden, dass die Anbindung des Beschichtungsmatenals nicht auf einer rein mechanischen Verklammerung, sondern auf einer metallurgischen Bindung beruht. Durch diese „echte" Haftung, die nur in einem Bereich von 0,5 bis 3% der Schichtdicke vorhanden sein muss, kann eine Steigerung der Haftzugfestigkeit um bis zu 80% gegenüber einer thermischen Spritzschicht erzielt werden. Dieser Anstieg in der Haftung bringt vor allem je nach Position im Bereich der Sicherheit bei Bespannungsrissen und anderen auch lokalen Überlastungen eine erhöhte Laufzeit. Depending on the position in the paper, board or tissue machine, the basic task of roller coating can range from "only wear-resistant" to "only corrosion-resistant". Common to all positions, however, is the requirement for good adhesion of the roll coating on the roll core. The above-mentioned disadvantages can be alleviated by an improved adhesion of the coating to the roll core to the effect that the connection of the coating material is not based on a purely mechanical clamping, but on a metallurgical bond. This "true" adhesion, which must be present only in a range of 0.5 to 3% of the layer thickness, an increase in the adhesive tensile strength can be achieved by up to 80% compared to a thermal sprayed layer.This increase in adhesion brings above all depending on the position in the area of safety in case of tearing cracks and other also local overloads an increased duration.
In Kombination der verbesserten Haftung mit einer verringerten Porosität der Beschichtung kann zudem die Korrosionsbeständigkeit gegenüber einer herkömmlichen thermischen Spritzschicht erhöht werden. Betrachtet man Fig. 1 , so ist in der linken Darstellung, Fig. 1A, ein Ausschnitt aus einer Walze 1 mit einer herkömmlichen thermischen Spritzschicht 2 stark schematisiert geschnitten dargestellt. Die Spritzschicht 2 ist auf einem Walzenkörper 3 aufgebracht, der aus Metall, vorzugsweise aus Stahl besteht. In combination, the improved adhesion with a reduced porosity of the coating can also increase the corrosion resistance compared to a conventional thermal spray coating. Referring to FIG. 1, in the left-hand illustration, FIG. 1A, a section of a roll 1 with a conventional thermal spray layer 2 is strong shown schematized cut. The spray layer 2 is applied to a roller body 3, which consists of metal, preferably of steel.
Wie weiter oben erläutert, kann die Spritzschicht 2 aus metallischen, keramischen oder Cermet-Werkstoffen zumindest teilweise bestehen. Die Anbindung der Werkstoffe an den Walzenmantel 3 erfolgt lediglich durch eine mechanische bzw. formschlüssige Verklammerung der erschmolzenen Partikel am Material des entsprechend präparierten Walzenmantels 3. Das so gebildete Interface 4 hat in radialer Richtung gesehen keine signifikante Ausdehnung. Die Anhaftung ist somit begrenzt. Insbesondere bei Korrosion durch Unterwanderung von Wasser und bei punktuellen mechanischen Überbelastungen wie beispielsweise beim Durchgang eines Fremdkörpers durch einen Walzenspalt zwischen zwei Walzen 1 ist somit damit zu rechnen, dass sich die Spritzschicht 2 bereichsweise vom Walzenmantel 3 löst. Dies kann zu Gefährdung des Bedienpersonals und zu Schädigungen nachfolgender Maschinenteile führen. As explained above, the sprayed layer 2 of metallic, ceramic or cermet materials may at least partially exist. The connection of the materials to the roll shell 3 is effected only by a mechanical or positive clamping of the molten particles on the material of the correspondingly prepared roll shell 3. The interface 4 thus formed has seen in the radial direction no significant expansion. The attachment is thus limited. In particular, when corrosion by infiltration of water and punctual mechanical overloads such as the passage of a foreign body through a nip between two rollers 1 is thus to be expected that the sprayed layer 2 partially dissolves the roll shell 3. This can lead to endangerment of the operating personnel and damage to subsequent machine parts.
Demgegenüber ist in Fig. 1 B in gleicher Ansicht wie Fig. 1A ein Querschnitt durch eine erfindungsgemäß mittels Laser Cladding hergestellten Beschichtung 5 dargestellt. Die Anbindung der Werkstoffe, die zu der Beschichtung 5 aufgebaut werden, an die Oberfläche des Walzenmantels 3, ist hier in einem verstärkten Maße vorhanden, da der Energieeintrag insgesamt höher ist und nicht nur die Werkstoffe erschmolzen, sondern auch thermische Energie in die Oberfläche des Walzenmantels 3 eingetragen wird. Dadurch wird der Walzenmantel 3 in geringem Maße angeschmolzen, so dass der Werkstoff, der durch eine geeignete Auftragsvorrichtung aufgetragen wird, in das Material des Walzenmantels einlegieren kann und somit eine metallurgische Verbindung mit dem Material des Walzenmantels 3 eingeht. Die kinetische Energie trägt hier somit kaum zum Beschichtungsprozess bei, im Gegensatz zum thermischen Spritzen. Dabei ist es ausreichend, wenn ein Legierungsbereich 6 ca. 0,1 bis 3%, bevorzugt 1 % der aufzubauenden Schichtstärke der Beschichtung 5 ausmacht. Dies ist in Hinblick auf das ebenfalls bekannte Verfahren des Auftragsschweißens als positiv zu bewerten. Einerseits ist der Legierungsbereich 6 kleiner, so dass eine feinere Verarbeitung der Werkstoffe möglich ist, was die Oberflächenqualität der Beschichtung 5 verbessert und nachfolgende Arbeitsschritte reduziert. In contrast, in FIG. 1B, in the same view as FIG. 1A, a cross-section through a coating 5 produced according to the invention by laser cladding is shown. The connection of the materials which are built up to the coating 5, to the surface of the roll shell 3, is present here to an increased extent, since the energy input is higher overall and not only melted the materials, but also thermal energy in the surface of the roll shell 3 is entered. Characterized the roll shell 3 is melted to a small extent, so that the material which is applied by a suitable applicator, can alloy into the material of the roll shell and thus enters into a metallurgical connection with the material of the roll shell 3. The kinetic energy thus hardly contributes to the coating process, in contrast to thermal spraying. It is sufficient if an alloy region 6 constitutes about 0.1 to 3%, preferably 1% of the layer thickness of the coating 5 to be built up. This is to be regarded as positive in view of the likewise known process of build-up welding. On the one hand, the alloy region 6 is smaller, so that a finer processing of the materials is possible, which improves the surface quality of the coating 5 and reduces subsequent work steps.
Andererseits wird die durch das Laser Cladding hergestellte Beschichtung 5 gewöhnlich in mehreren Hüben hergestellt, wobei zwischen den Lagen der einzelnen Hübe ebenfalls wieder ein Legierungsbereich entsteht, da jedes Mal der darunterliegende Bereich erneut angeschmolzen und mit der darauf liegenden weiteren Lage legiert wird. Daraus ergibt sich wiederum erhöhte Haftung und Korrosionsbeständigkeit. On the other hand, the coating 5 produced by the laser cladding is usually produced in several strokes, wherein an alloy region also arises between the layers of the individual strokes, since each time the underlying region is remelted and alloyed with the further layer lying thereon. This in turn results in increased adhesion and corrosion resistance.
In Fig. 2 ist in stark schematisierter Ansicht der Aufbau einer Beschichtung 5 auf eine Walze 1 dargestellt. FIG. 2 shows a highly schematic view of the structure of a coating 5 on a roll 1.
Die Walze 1 ist dabei rotierend gelagert und wird geeignet angetrieben, so dass sie sich unter einer vorzugsweise axial entlang der Walze 1 verschieblichen Auftragsvorrichtung 7 hinwegdreht. Dadurch kann die gesamte Oberfläche der Walze 1 in einer kontinuierlichen Spirallinie in zumindest einem oder mehreren Hüben beschichtet werden. Es ist jedoch auch möglich, die Beschichtung 5 in anderer Weise aufzubringen, z. B. in radialen Ringen oder axialen Streifen. Die Auftragsvorrichtung 7 umfasst im Wesentlichen eine Werkstoffzufuhr 8 und eine Energiequelle 9, in welche der gewöhnlich pulverförmige Werkstoff eingetragen wird. Als Energiequelle 9 sind induktive sowie plasmaerzeugende Vorrichtungen und Laser verschiedener Typen wie CO2-Laser, HDPL (High Power Diode Laser) oder DDL (Direct Diode Laser) denkbar. Der Aufbau einer Beschichtung 5 mittels Laser Cladding stellt dabei die technologisch am einfachsten zu realisierende Variante dar. Ein großer ökonomischer Vorteil des Verfahrens ist in der hohen Abscheideeffizienz gegenüber thermischen Beschichtungen bei erhöhter Schichtstärke pro Hub (μηη/pass) zu sehen. The roller 1 is rotatably mounted and is suitably driven so that it rotates away under a preferably axially displaceable along the roller 1 application device 7. Thereby, the entire surface of the roll 1 can be coated in a continuous spiral line in at least one or more strokes. However, it is also possible to apply the coating 5 in a different manner, for. B. in radial rings or axial stripes. The application device 7 essentially comprises a material supply 8 and an energy source 9, in which the usually powdery material is introduced. As energy source 9 inductive and plasma-generating devices and lasers of various types such as CO2 laser, HDPL (High Power Diode Laser) or DDL (Direct Diode Laser) are conceivable. The construction of a coating 5 by means of laser cladding represents the most technologically feasible variant. A major economic advantage of the process is the high separation efficiency compared to thermal coatings with increased layer thickness per stroke (μηη / pass).

Claims

Patentansprüche claims
1 . Walze (1 ) zur Verwendung in einer Maschine zur Herstellung und/oder Weiterverarbeitung einer Faserstoffbahn wie einer Papier-, Karton- oder Tissuebahn, umfassend einen Walzenmantel (3), der zumindest bereichsweise aus einem metallischen Werkstoff besteht, und einer darauf ausgebildeten Beschichtung (5), dadurch gekennzeichnet, dass die Beschichtung (5) aus einem metallischen, keramischen und/oder einem Cermet-Werkstoff besteht oder einen solchen zumindest bereichsweise umfasst, wobei zwischen dem Walzenmantel (3) und der Beschichtung (5) ein Legierungsbereich (6) ausgebildet ist. 1 . Roller (1) for use in a machine for the production and / or further processing of a fibrous web, such as a paper, board or tissue web, comprising a roll shell (3), which at least partially consists of a metallic material, and a coating (5) formed thereon ), characterized in that the coating (5) consists of a metallic, ceramic and / or a cermet material or at least partially comprises, wherein formed between the roll shell (3) and the coating (5) an alloy region (6) is.
2. Walze nach Anspruch 1 , dadurch gekennzeichnet, dass der Legierungsbereich (6) eine Stärke von 0,5 bis 3%, vorzugsweise von 1 % der Schichtstärke der2. Roller according to claim 1, characterized in that the alloy region (6) has a thickness of 0.5 to 3%, preferably 1% of the layer thickness of
Beschichtung (5) aufweist. Coating (5).
3. Walze nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in dem3. Roller according to claim 1 or 2, characterized in that in the
Legierungsbereich (6) eine metallurgische Verbindung zwischen dem Werkstoff und dem Material des Walzenmantels (3) besteht. Alloy area (6) is a metallurgical connection between the material and the material of the roll shell (3).
4. Walze nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die4. Roller according to one of claims 1 to 3, characterized in that the
Beschichtung (5) unter Verwendung einer induktiven Vorrichtung, einer Plasmakanone oder eines Lasers hergestellt ist. Coating (5) using an inductive device, a plasma gun or a laser is made.
5. Walze nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der5. Roller according to one of claims 1 to 4, characterized in that the
Werkstoff in Pulverform, als Draht oder in Stangenform vorliegt. Material in powder form, as a wire or in rod form.
6. Walze nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die6. Roller according to one of claims 1 to 5, characterized in that the
Beschichtung (5) zumindest eine Schicht, die durch einen einzelnen Hub erzeugt ist, bevorzugt mehrere Schichten, die durch mehrere Hübe erzeugt sind, aufweist. Coating (5) at least one layer, which is produced by a single stroke, preferably a plurality of layers, which are produced by a plurality of strokes.
EP14709275.3A 2013-05-06 2014-03-11 Roll Active EP2994572B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013208254 2013-05-06
PCT/EP2014/054651 WO2014180588A1 (en) 2013-05-06 2014-03-11 Roll

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EP2994572A1 true EP2994572A1 (en) 2016-03-16
EP2994572B1 EP2994572B1 (en) 2017-10-18

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WO (1) WO2014180588A1 (en)

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WO2016071299A1 (en) * 2014-11-06 2016-05-12 Voith Patent Gmbh Roller and method for producing such a roller
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DE102016114014B4 (en) * 2016-07-29 2018-05-17 Voith Patent Gmbh Process for coating a drying cylinder
CN113680590B (en) * 2021-08-12 2022-06-24 上海交通大学 Device and method for preparing electrically-assisted gradient coating of fuel cell polar plate substrate

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Also Published As

Publication number Publication date
EP2994572B1 (en) 2017-10-18
CN105189866B (en) 2017-12-15
WO2014180588A1 (en) 2014-11-13
US20160130756A1 (en) 2016-05-12
CN105189866A (en) 2015-12-23
US9863091B2 (en) 2018-01-09

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