EP1804973B9 - Press roller annular casing and method for production thereof - Google Patents

Press roller annular casing and method for production thereof Download PDF

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Publication number
EP1804973B9
EP1804973B9 EP05783028.3A EP05783028A EP1804973B9 EP 1804973 B9 EP1804973 B9 EP 1804973B9 EP 05783028 A EP05783028 A EP 05783028A EP 1804973 B9 EP1804973 B9 EP 1804973B9
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Prior art keywords
casing
annular casing
roller
spaced
annular
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German (de)
French (fr)
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EP1804973B1 (en
EP1804973A1 (en
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Alexander Hagedorn
Meinhard Frangenberg
Dieter Brendler
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KHD Humboldt Wedag AG
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KHD Humboldt Wedag AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers

Definitions

  • the invention relates to a ring bandage with a wear-resistant surface for a press roll for the compressive stress of granular material, in particular for roller presses for Gutbettzerkleintation. Moreover, the invention relates to a method for manufacturing such a press roll ring bandage.
  • They should have a high wear resistance, can be produced inexpensively, can be repaired by the operator of the roller press, and also have a good intake behavior for the material to be shredded.
  • the invention has for its object to provide in particular for the press rolls of roller presses for crushing granular material a ring bandage whose outer surface always has a high wear resistance, without embedded carbide body such. B. need to apply powder-metallurgically produced stud bolts.
  • the material of the ring bandage according to the invention for a press roll in particular for the comminution fine granular material consists of cast iron with nodular graphite bainitic structure with retained austenite, this material is adjusted in its property that it has such a ductility that the ring bandage whose wall thickness to may amount to about 500 mm, without risk of breakage on a roll body with shaft journals shrink down. Surprisingly, it has been shown that through external pressure load of the bandage surface of the casting material hardens on its surface and in its peripheral layers by formation of martensite.
  • the greatest hardness and wear resistance is substantially at the surface and in the edge layers of the bandage and not in the radially inner regions of the bandage.
  • the hardness in the marginal layers of the bandage forms and renews itself during operation of the roll machine again and again until the bandage is consumed after a long service life to the structurally necessary residual wall thickness.
  • the ring bandage according to the invention thus forms self-hardening surface layers.
  • spaced-apart recesses are formed, for. B. molded during casting and / or formed by mechanical processing, in particular grooving, so that is pressed during operation of the rolling machine in the recesses of the profiled outer surface of the ring bandage to be treated
  • Gutmaterial which remains there during the roller revolutions, forms an autogenous wear protection for the drum surfaces and due to its roughness also has a good intake behavior.
  • lying between the spaced groove recesses profiling protrusions of the drum surface are still armored by existing hard material surfacing worms.
  • This additional armor of the ring bandage according to the invention creates no problems, since the welding stresses arising during buildup welding are almost neutralized by the dimensioning and geometric distribution of the material bumps between the spaced grooves and thus the cracking of the annular bandage material is avoided by welding in this way.
  • the method for producing a press roller ring bandage for the compressive stress granular material especially for roller presses for Gutbettzerkleintation is according to the invention is characterized in that the annular bandage is cast first of nodular cast iron with at least the alloying elements Ni and Mo while avoiding a pearlitic structure and by a subsequent heat treatment and subsequent controlled cooling of the cast body is given a bainitic structure with retained austenite, wherein pressure exerted by the outer surface of the annular bandage in their operation whose outer surface layers are cured again and again to form martensite.
  • the shaping of the surface profiling of the ring bandage is accomplished in particular by grooving.
  • Fig. 1 is on a roller body 8 with shaft journals 9a, 9b a ring bandage 10 with a wall thickness of z. B. 170 mm to 500 mm attached, in particular by shrinking.
  • the material of the bandage 10 consists of nodular cast iron with bainitic structure with retained austenite.
  • the roll surface contains high martensite portions, which are formed again and again by external pressure loading of the bandage surface, in particular during operation of the press roll.
  • the occurring in the Gutbettzerkleintation in the nip of a roller press pressure can, for. B. greater than 100 MPa and the specific pressing force z. B. 8 to 10 t / cm roll width.
  • the hardness of the ring bandage according to the invention can, for. B. be about 40 HRC.
  • the hardness and wear resistance form and renew during operation of the press roll over and over again until after a long life, the ring bandage is consumed.
  • Fig. 2 are recesses formed in the outer surface of the annular band 10, 11 spaced apart grooves, namely grooves 12, 13, which may be formed by casting, but are made in particular by mechanical processing such as grooving.
  • grooves 12, 13 which may be formed by casting, but are made in particular by mechanical processing such as grooving.
  • Profiltechniksvorsprünge the bandage surface can still be armored by hard-facing welding beads 14 or by other hard materials.

Description

Die Erfindung betrifft eine Ringbandage mit verschleißfester Oberfläche für eine Presswalze für die Druckbeanspruchung körnigen Gutes, insbesondere für Rollenpressen zur Gutbettzerkleinerung. Außerdem betrifft die Erfindung ein Verfahren zur Fertigung einer solchen Presswalzen-Ringbandage.The invention relates to a ring bandage with a wear-resistant surface for a press roll for the compressive stress of granular material, in particular for roller presses for Gutbettzerkleinerung. Moreover, the invention relates to a method for manufacturing such a press roll ring bandage.

Bei Walzenmühlen wird körniges sprödes Mahlgut in den Walzenspalt, durch den die beiden drehbar gelagerten gegenläufig rotierbaren Walzen voneinander getrennt sind, eingezogen und dort einer Druckzerkleinerung unterworfen. Bekannt ist auch die sogenannte Gutbettzerkleinerung im Walzenspalt einer Hochdruck-Walzenmühle, auch Rollenpresse genannt, bei der die einzelnen Partikel des durch Reibung in den Walzenspalt eingezogenen Mahlgutes in einem Gutbett, d. h. in einer zwischen den beiden Walzenoberflächen zusammengedrückten Materialschüttung bei Anwendung eines hohen Druckes gegenseitig zerquetscht werden. Dabei sind die Walzenoberflächen einer hohen Verschleißbeanspruchung ausgesetzt, so dass an solche Walzenoberflächen wenigstens die folgenden Anforderungen gestellt werden:In roll mills, granular, brittle material to be ground is introduced into the nip, by which the two rotatably mounted counterrotatable rolls are separated from one another, where they are subjected to pressure comminution. Also known is the so-called Gutbettzerkleinerung in the nip of a high-pressure roller mill, also called roller press, in which the individual particles of the drawn by friction in the nip grinding material in a bed of good, d. H. be crushed each other in a compressed between the two roll surfaces bulk material when using a high pressure. The roll surfaces are exposed to a high level of wear, so that at least the following requirements are imposed on such roll surfaces:

Sie sollen eine hohe Verschleißwiderstandsfähigkeit haben, kostengünstig hergestellt werden können, durch den Betreiber der Rollenpresse repariert werden können, und auch ein gutes Einzugsverhalten für das zu zerkleinernde Gut besitzen.They should have a high wear resistance, can be produced inexpensively, can be repaired by the operator of the roller press, and also have a good intake behavior for the material to be shredded.

Aus dem Aufsatz der Fachzeitschrift " ZKG International" Nr. 7/1997, Seiten 384 bis 392 ist es auf Seite 384 Absatz 1 zum Verschleißschutz bei Hochdruck-Rollenpressen bekannt, dass Walzen-Bandagen aus Hartguss wegen ihrer hohen Druckfestigkeit vorteilhaft sein können und dass mit Bandagen aus legiertem Sphäroguss hohe Standzeiten der Rollenpresse erreicht werden können, wobei man in der Werkstoffkunde unter dem Begriff Sphäroguss Gusseisen mit Kugelgraphit versteht. Bekannt ist ferner aus dem Nachdruck aus der Fachzeitschrift "konstruieren + gießen" 1988 Nr. 1 der Zentrale für Gußverwendung, Düsseldorf mit dem Aufsatz "Gusseisen mit Kugelgraphit" (Duktiles Gusseisen) Seiten 13-16 , dem Kugelgraphitguss durch eine spezielle Wärmebehandlung, dem sogenannten Bainitvergüten eine hohe Duktilität und Druckfestigkeit zu geben.From the essay of the journal " ZKG International "No. 7/1997, pages 384 to 392 it is known on page 384 paragraph 1 for wear protection in high-pressure roller presses that roll bandages made of chilled cast iron can be advantageous because of their high compressive strength and that can be achieved with bandages of alloyed nodular cast iron long life of the roller press, where in the material under the Term ductile iron Cast iron with nodular graphite understands. It is also known from the reprint from the journal "design + pour" 1988 No. 1 of the headquarters for casting use, Dusseldorf with the essay "cast iron with nodular graphite" (Ductile cast iron) pages 13-16 , To give the nodular cast iron by a special heat treatment, the so-called Bainitvergüten a high ductility and compressive strength.

Aus der EP-A 0 563 564 und EP-A 0 916 407 ist es bekannt, den Hartguss-Walzenmantel einer Mahlwalze aus einer bainitischen Gusseisenlegierung herzustellen und zur Erhöhung der Verschleißfestigkeit und der Mahlguteinzugsfähigkeit auf der Außenumfangsfläche des Walzenmantels eine Oberflächenprofilierung aus Hartauftragsschweißwerkstoffen aufzubringen. Auftragsschweißraupen sind zwar in der Lage, zur Verbesserung des Einzugsverhaltens des Aufgabegutes beizutragen, aber nicht zum autogenen Verschleißschutz, weil Auftragsschweißraupen mit ihrem typischen abgerundeten Profil das in die Zwischenräume zwischen den Schweißraupen gelangende Gutmaterial nicht dauerhaft festhalten können.From the EP-A 0 563 564 and EP-A 0 916 407 It is known to produce the chilled cast iron roll shell of a bainitic cast iron alloy grinding roll and to apply a surface profiling of hardfacing materials to increase the wear resistance and Mahlguteinzugsfähigkeit on the outer peripheral surface of the roll shell. Hardfacing beads are indeed able to contribute to improving the intake behavior of the feed material, but not for autogenous wear protection, because hardfacing beads with their typical rounded profile can not permanently hold the reaching into the spaces between the weld beads good material.

Schließlich ist es aus der EP-B 0 516 952 Fig. 2 bekannt, die Walzenoberfläche von Rollenpressen dadurch verschleißfester zu machen, indem auf der Walzenoberfläche eine Vielzahl von vorgefertigten Hartmetallkörpern wie z. B. Noppenbolzen angeordnet wird, die in entsprechende Sacklochbohrungen des Walzenmantels eingelagert sind. Bei dieser sogenannten Rasterpanzerung stehen die Noppenbolzen mit einer so großen Höhe nach außen von der Walzenoberfläche vor und sie sind mit einem solchen Abstand voneinander angeordnet, dass im Betrieb der Rollenpresse auf der Walzenoberfläche die Zwischenräume zwischen den Noppenbolzen mit dem zusammengepressten feinkörnigen Gutmaterial ausgefüllt bleiben, welches einen autogenen Verschleißschutz für die Walzenoberflächen bildet und aufgrund seiner Rauhigkeit auch ein gutes Einzugsverhalten aufweist. Diese bekannte Walzenoberflächenpanzerung mit abwechselnd Zonen hochverschleißfesten Werkstoffes und Zwischenraumzonen anderer Verschleißfestigkeit hat sich bei der Gutbettzerkleinerung insbesondere von Erzmaterial in der Praxis bewährt.Finally it is off the EP-B 0 516 952 Fig. 2 Known to make the roller surface of roller presses wear-resistant by a variety of prefabricated hard metal bodies such. B. knob stud is arranged, which are incorporated in corresponding blind holes of the roll shell. In this so-called grid armor stand the stud bolts with such a large amount outwards from the roll surface and they are spaced apart such that, during operation of the roll press on the roll surface, the spaces between the stud bolts remain filled with the compressed fine-grained material forming autogenous wear protection for the roll surfaces and due to its roughness also has a good intake behavior. This known roll surface armor with alternately zones highly wear-resistant material and gap zones other wear resistance has been proven in the Gutbettzerkleinerung particular ore material in practice.

Der Erfindung liegt die Aufgabe zugrunde, insbesondere für die Presswalzen von Rollenpressen zur Druckzerkleinerung körnigen Gutes eine Ringbandage zu schaffen, deren Außenoberfläche immer eine hohe Verschleißwiderstandsfähigkeit aufweist, ohne eingelagerte Hartmetallkörper wie z. B. pulvermetallurgisch hergestellte Noppenbolzen anwenden zu müssen.The invention has for its object to provide in particular for the press rolls of roller presses for crushing granular material a ring bandage whose outer surface always has a high wear resistance, without embedded carbide body such. B. need to apply powder-metallurgically produced stud bolts.

Diese Aufgabe wird gemäß der Erfindung mit der im Anspruch 1 beanspruchten Ringbandage gelöst, die mit dem Verfahren mit den Merkmalen des Anspruchs 4 hergestellt wird. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved according to the invention with the claimed in claim 1 ring bandage, which is produced by the method with the features of claim 4. Advantageous embodiments of the invention are specified in the subclaims.

Der Werkstoff der erfindungsgemäßen Ringbandage für eine Presswalze insbesondere für die Gutbettzerkleinerung körnigen Gutes besteht aus Gusseisen mit Kugelgraphit mit bainitischem Gefüge mit Restaustenit, wobei dieser Werkstoff in seiner Eigenschaft so eingestellt ist, dass er eine derartige Duktilität aufweist, dass sich die Ringbandage, deren Wanddicke bis zu etwa 500 mm betragen kann, ohne Bruchgefahr auf einen Walzengrundkörper mit Wellenzapfen fest aufschrumpfen lässt. Überraschend hat sich gezeigt, dass durch äußere Druckbelastung der Bandagenoberfläche der Gusswerkstoff an seiner Oberfläche und in seinen Randschichten durch Bildung von Martensit aufhärtet. Das heißt, bei der erfindungsgemäßen Ringbandage liegt die größte Härte und Verschleißfestigkeit im wesentlichen an der Oberfläche und in den Randschichten der Bandage und nicht in den radial inneren Bereichen der Bandage. Die Härte in den Randschichten der Bandage bildet und erneuert sich beim Betrieb der Walzenmaschine immer wieder, bis die Bandage nach langer Standzeit bis auf die konstruktiv notwendige Restwandstärke verbraucht ist. Die erfindungsgemäße Ringbandage bildet also selbsthärtende Randschichten.The material of the ring bandage according to the invention for a press roll in particular for the comminution fine granular material consists of cast iron with nodular graphite bainitic structure with retained austenite, this material is adjusted in its property that it has such a ductility that the ring bandage whose wall thickness to may amount to about 500 mm, without risk of breakage on a roll body with shaft journals shrink down. Surprisingly, it has been shown that through external pressure load of the bandage surface of the casting material hardens on its surface and in its peripheral layers by formation of martensite. That is, in the ring bandage according to the invention the greatest hardness and wear resistance is substantially at the surface and in the edge layers of the bandage and not in the radially inner regions of the bandage. The hardness in the marginal layers of the bandage forms and renews itself during operation of the roll machine again and again until the bandage is consumed after a long service life to the structurally necessary residual wall thickness. The ring bandage according to the invention thus forms self-hardening surface layers.

In die Außenoberfläche der Ringbandage sind voneinander beabstandete Vertiefungen eingeformt, z. B. beim Gießen eingeformt und/oder durch mechanische Bearbeitung insbesondere Nutenschleifen eingeformt, so dass im Betrieb der Walzenmaschine in die Nutenvertiefungen der profilierten Außenoberfläche der Ringbandage zu behandelndes Gutmaterial eingepresst wird, welches dort während der Walzenumdrehungen verbleibt, einen autogenen Verschleißschutz für die Bandagenoberflächen bildet und aufgrund seiner Rauhigkeit auch ein gutes Einzugsverhalten aufweist. Dabei sind die zwischen den beabstandeten Nutenvertiefungen liegenden Profilierungsvorsprünge der Bandagenoberfläche noch durch aus Hartstoff bestehende Auftragsschweißraupen gepanzert. Diese zusätzliche Panzerung der erfindungsgemäßen Ringbandage schafft keine Probleme, da die beim Auftragsschweißen entstehenden Schweißspannungen durch die Dimensionierung und geometrische Verteilung der Material-Höcker zwischen den beabstandeten Nuten nahezu neutralisiert werden und somit auf diese Weise die Rissbildung des Ringbandagenwerkstoffes durch Schweißen vermieden wird.In the outer surface of the annular bandage spaced-apart recesses are formed, for. B. molded during casting and / or formed by mechanical processing, in particular grooving, so that is pressed during operation of the rolling machine in the recesses of the profiled outer surface of the ring bandage to be treated Gutmaterial which remains there during the roller revolutions, forms an autogenous wear protection for the drum surfaces and due to its roughness also has a good intake behavior. In this case, lying between the spaced groove recesses profiling protrusions of the drum surface are still armored by existing hard material surfacing worms. This additional armor of the ring bandage according to the invention creates no problems, since the welding stresses arising during buildup welding are almost neutralized by the dimensioning and geometric distribution of the material bumps between the spaced grooves and thus the cracking of the annular bandage material is avoided by welding in this way.

Das Verfahren zur Fertigung einer Presswalzen-Ringbandage für die Druckbeanspruchung körnigen Gutes insbesondere für Rollenpressen zur Gutbettzerkleinerung ist erfindungsgemäß dadurch gekennzeichnet, dass die Ringbandage zunächst aus Gusseisen mit Kugelgraphit mit wenigstens den Legierungselementen Ni und Mo unter Vermeidung eines perlitischen Gefüges gegossen wird und durch eine anschließende Wärmebehandlung und nachfolgende kontrollierte Abkühlung dem Gusskörper ein bainitisches Gefüge mit Restaustenit gegeben wird, wobei durch Druckbelastung der Außenoberfläche der Ringbandage bei deren Betrieb deren äußere Randschichten unter Ausbildung von Martensit immer wieder neu gehärtet werden. Das Einformen der Oberflächenprofilierung der Ringbandage wird insbesondere durch Nutenschleifen bewerkstelligt.The method for producing a press roller ring bandage for the compressive stress granular material especially for roller presses for Gutbettzerkleinerung is according to the invention is characterized in that the annular bandage is cast first of nodular cast iron with at least the alloying elements Ni and Mo while avoiding a pearlitic structure and by a subsequent heat treatment and subsequent controlled cooling of the cast body is given a bainitic structure with retained austenite, wherein pressure exerted by the outer surface of the annular bandage in their operation whose outer surface layers are cured again and again to form martensite. The shaping of the surface profiling of the ring bandage is accomplished in particular by grooving.

Die Erfindung und deren weitere Merkmale und Vorteile werden anhand des in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert.The invention and its further features and advantages will be explained in more detail with reference to the embodiment schematically illustrated in the drawing.

Es zeigt:

Fig. 1:
die Ansicht einer Presswalzenwelle einer Gutbettzerkleinerungs-Rollenpresse mit aufgeschrumpfter Ringbandage im Schnitt gezeichnet, und
Fig. 2:
einen äußeren Ausschnitt aus dem Umfang der Ringbandage der Fig. 1 gezeigt im Vertikalschnitt quer zur Walzenachse.
It shows:
Fig. 1:
the view of a press roll shaft of a Gutbettzerkleinerungs roller press with shrunk ring bandage drawn in section, and
Fig. 2:
an outer section of the circumference of the ring bandage the Fig. 1 shown in vertical section transverse to the roll axis.

Nach Fig. 1 ist auf einem Walzengrundkörper 8 mit Wellenzapfen 9a, 9b eine Ringbandage 10 mit einer Wanddicke von z. B. 170 mm bis 500 mm befestigt, insbesondere durch Aufschrumpfen.To Fig. 1 is on a roller body 8 with shaft journals 9a, 9b a ring bandage 10 with a wall thickness of z. B. 170 mm to 500 mm attached, in particular by shrinking.

Der Werkstoff der Bandage 10 besteht aus Kugelgraphitguss mit bainitischem Gefüge mit Restaustenit. In der Randschicht 11 der Ringbandage 10 enthält die Walzenoberfläche hohe Martensitanteile, die durch äußere Druckbelastung der Bandagenoberfläche insbesondere beim Betrieb der Presswalze immer wieder neu gebildet werden. Der bei der Gutbettzerkleinerung im Walzenspalt einer Rollenpresse auftretende Pressdruck kann z. B. größer 100 MPa und die spezifische Presskraft z. B. 8 bis 10 t/cm Walzenbreite betragen. Die Härte der erfindungsgemäßen Ringbandage kann z. B. etwa 40 HRC betragen. Die Härte und Verschleißfestigkeit bilden und erneuern sich während des Betriebes der Presswalze immer wieder, bis nach langer Standzeit die Ringbandage verbraucht ist.The material of the bandage 10 consists of nodular cast iron with bainitic structure with retained austenite. In the surface layer 11 of the annular bandage 10, the roll surface contains high martensite portions, which are formed again and again by external pressure loading of the bandage surface, in particular during operation of the press roll. The occurring in the Gutbettzerkleinerung in the nip of a roller press pressure can, for. B. greater than 100 MPa and the specific pressing force z. B. 8 to 10 t / cm roll width. The hardness of the ring bandage according to the invention can, for. B. be about 40 HRC. The hardness and wear resistance form and renew during operation of the press roll over and over again until after a long life, the ring bandage is consumed.

Gemäß dem zeichnerischen Ausführungsbeispiel der Fig. 2 sind in die Außenoberfläche der Ringbandage 10, 11 voneinander beabstandete Vertiefungen eingeformt, nämlich Nuten 12, 13, die gießtechnisch eingeformt sein können, aber insbesondere durch mechanische Bearbeitung wie Nutenschleifen hergestellt sind. Dabei können die zwischen den beabstandeten Vertiefungen 12, 13 liegenden Profilierungsvorsprünge der Bandagenoberfläche noch durch Hartauftragsschweißraupen 14 oder durch andere Hartstoffe gepanzert sein.According to the drawing embodiment of Fig. 2 are recesses formed in the outer surface of the annular band 10, 11 spaced apart grooves, namely grooves 12, 13, which may be formed by casting, but are made in particular by mechanical processing such as grooving. In this case, lying between the spaced recesses 12, 13 Profilierungsvorsprünge the bandage surface can still be armored by hard-facing welding beads 14 or by other hard materials.

Das beim Betrieb der Rollenpresse während der Gutbettzerkleinerung in die Vertiefungen 12, 13 mit einer Nutbreite von z. B. 10 bis 15 mm eingepresste Gutmaterial bildet einen autogenen Verschleißschutz, wodurch die ohnehin schon hohe Verschleißwiderstandfähigkeit der Oberfläche der erfindungsgemäßen Ringbandage 10 noch erhöht wird.During operation of the roller press during the comminution in the recesses 12, 13 with a groove width of z. B. 10 to 15 mm pressed material forms an autogenous wear protection, whereby the already high wear resistance of the surface of the ring bandage 10 according to the invention is still increased.

Claims (4)

  1. Annular casing with wear-resistant surface for a pressing roller for the pressure treatment of granular substances, in particular for roller presses for comminuting a bed of particles,
    characterized by the following features:
    a) the material of the casing (10, 11) consists of nodular cast iron comprising at least the alloying elements Ni and Mo and has a bainitic structure with residual austenite,
    b) the peripheral layers (11) of the annular casing (10), for the purpose of achieving a hard surface, contain martensite, which is constantly renewed as a result of the casing surface being subjected to external pressure loading during operation of the pressing roller,
    c) spaced-apart depressions (12, 13) for autogenous wear protection are formed in the outer surface of the casing (10, 11),
    wherein profiling protrusions of the casing surface, which are located between the spaced-apart depressions (12, 13), are provided with further armour-plating by deposition-weld beads (14) consisting of hard materials.
  2. Annular casing according to Claim 1,
    characterized in that the depressions (12, 13) formed in the outer surface of the casing are produced by groove grinding.
  3. Annular casing according to Claim 1,
    characterized in that the casing (10) has a wall thickness of up to approximately 500 mm and is shrink-fitted on a basic roller body with shaft journals.
  4. Method of producing a press-roller annular casing for subjecting granular substances to pressure, in particular for roller presses for comminuting a bed of particles,
    characterized by the combination of the following features:
    a) the annular casing (10, 11) is cast from nodular cast iron comprising at least the alloying elements Ni and Mo,
    b) subsequent heat treatment followed by controlled cooling gives the casting a bainitic structure with residual austenite,
    c) the peripheral layers of the annular casing (10, 11) are constantly re-hardened, with martensite being formed in the process, by virtue of the outer surface of the annular casing being subjected to pressure loading,
    d) spaced-apart depressions (12, 13) are formed in the outer surface of the annular casing (10, 11), prior to the latter being used in the roller press, by casting and/or by machining, in particular groove grinding,
    wherein profiling protrusions of the casing surface, which are located between the spaced-apart depressions (12, 13), are provided with further armour-plating by deposition-weld beads (14) consisting of hard materials.
EP05783028.3A 2004-09-09 2005-09-07 Press roller annular casing and method for production thereof Active EP1804973B9 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004043562.6A DE102004043562B4 (en) 2004-09-09 2004-09-09 Press roller ring bandage and method for its production
PCT/EP2005/009574 WO2006027215A1 (en) 2004-09-09 2005-09-07 Press roller annular casing and method for production thereof

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EP1804973A1 EP1804973A1 (en) 2007-07-11
EP1804973B1 EP1804973B1 (en) 2013-06-05
EP1804973B9 true EP1804973B9 (en) 2016-09-21

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US (2) US7832671B2 (en)
EP (1) EP1804973B9 (en)
CN (1) CN100581652C (en)
DE (1) DE102004043562B4 (en)
DK (1) DK1804973T3 (en)
WO (1) WO2006027215A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102007007276B4 (en) * 2007-02-14 2019-12-05 Khd Humboldt Wedag Gmbh Armoring of the surfaces of roller press rolls
DE102010024221A1 (en) * 2010-06-18 2011-12-22 Khd Humboldt Wedag Gmbh Profiled bandage for a roller press
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CN102962652B (en) * 2012-12-17 2015-03-11 重庆京庆重型机械股份有限公司 Processing method for roller sleeve of roller press
DE102014006427A1 (en) * 2014-05-02 2015-11-05 Khd Humboldt Wedag Gmbh Roller with wear protection layer for a roller press
DE102018111621B4 (en) * 2018-05-15 2020-01-23 Helmut Prihoda Processes to improve the productivity of grinding plants
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US20080191074A1 (en) 2008-08-14
DK1804973T3 (en) 2013-09-08
WO2006027215A1 (en) 2006-03-16
DE102004043562B4 (en) 2016-09-29
DE102004043562A1 (en) 2006-03-30
US7832671B2 (en) 2010-11-16
CN100581652C (en) 2010-01-20
US20110061773A1 (en) 2011-03-17
EP1804973B1 (en) 2013-06-05
US8388772B2 (en) 2013-03-05
EP1804973A1 (en) 2007-07-11
CN101039752A (en) 2007-09-19

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