EP0916407A1 - Method for manufacturing a milling roller - Google Patents

Method for manufacturing a milling roller Download PDF

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Publication number
EP0916407A1
EP0916407A1 EP98120943A EP98120943A EP0916407A1 EP 0916407 A1 EP0916407 A1 EP 0916407A1 EP 98120943 A EP98120943 A EP 98120943A EP 98120943 A EP98120943 A EP 98120943A EP 0916407 A1 EP0916407 A1 EP 0916407A1
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EP
European Patent Office
Prior art keywords
roll shell
roller
hard
shell
bainitic
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Granted
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EP98120943A
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German (de)
French (fr)
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EP0916407B2 (en
EP0916407B1 (en
Inventor
Heinz Dipl.-Ing. Schröder
Helmut Dipl.-Ing. Lücke
Ludger Dr.-Ing. Rübbelke
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Schwaebische Huettenwerke Automotive GmbH
ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Classifications

    • 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 method for manufacturing a grinding roller for the comminution of brittle regrinds in a material bed roller mill, according to the Preamble of claim 1.
  • roller surfaces are straight very much with the brittle and abrasive grinding materials mentioned high demands both with regard to abrasion (Wear) and exposed to the pressures the roller shell will be used here every Grinding roller made of accordingly resistant and especially made of wear-resistant material.
  • roller materials mainly include chilled cast iron as well Alloyed hard materials by cladding be applied to the base material. At this Crushing in a material bed roller mill causes this occurring on the roll surfaces or roll shells high pressures that after appropriate running or Operating times of the roller material, especially those of today mostly used surfaced roll shells tired especially near the surface, apart from the sometimes considerable wear. This material fatigue leads to the The service lives of these grinding rollers are limited; leave with it the roller shells also no longer regenerate sensibly.
  • EP-B-563 564 there is therefore a material bed roller mill proposed to be used in the grinding rollers which according to the preamble of claim 1 are manufactured, i.e. which in particular a roller shell from a wear-resistant chilled cast iron, at which is among others from a highly wear-resistant bainitic Cast material can act.
  • the special thing about this known grinding rollers is that on the Surface of the chill roll shell of each grinding roller Profiles in the form of welding beads made of wear-resistant Cladding material applied are. It has been shown that by this production the milling castors made of chilled cast iron with build-up welding a significantly higher compressive strength and thus longer life in terms of wear than with the above-mentioned weld-welded grinding rollers can be achieved.
  • the chilled cast iron or the chilled cast iron material is a relative has brittle behavior.
  • the latter can especially in the case of relatively intermittent or striking Shredding work or stress on the grinding rollers, as is especially the case with very brittle and large pieces Regrind is often the case, cause the hard cast material breaks spontaneously.
  • it can already undesirable during the manufacture of the grinding rollers Breaks come; this can already happen with oneshrinking the roll cover onto the roll base due to shrinkage stresses happen.
  • the invention is therefore based on the object Method of the prerequisite in the preamble of claim 1 Way to further improve in such a way that still relatively high wear and pressure resistance particularly high operational reliability of the roll shell (and thus the entire grinding roller) against breakage can be achieved.
  • the roll shell consists of a ductile bainitic nodular cast iron with an elongation at break of about 0.1 to about 2.5% and a compressive strength of about 1,000 to 1,800 MPa is produced, with a preferred maximum value of the aforementioned elongation at break is around 2.0%.
  • an elongation at break of the cast material and thus the roll shell of at least about 0.5%, i.e. an elongation at break from about 0.5 to 2.5%, particularly preferably from about 0.5 to 2.0%, and a compressive strength of about 1,200 to 1,600 MPa selected.
  • the roll shell with a hardness of about 42 to 55 HRc, preferably from about 45 to 50 HRc, i.e. Rockwell hardness.
  • a grinding roller are examples of typical below Called compositions.
  • the roll shell i.e. for the real one Sheath body
  • the hard overlay welding material is preferably one highly wear-resistant chrome-carbon alloy used, in addition to chrome carbides there are also special carbides form.
  • the hard material can also thanks to highly wear-resistant tungsten carbide surfacing be formed.
  • the roll shell can affect the material properties of ductile bainitic ductile iron by controlled cooling and / or heat treatment of the roll shell in the desired or required Way to be set.
  • the invention manufactured grinding roller in a constructive or structural In terms of general terms and shape can be carried out in the same way as it is with Gutbett roll mills well known and also essentially is described in the mentioned EP-B 563 564.
  • this grinding roller generally in two parts from the roller body (sometimes also as roller shaft referred to) and firmly attached to it Roll jacket exists.
  • the roller body can manufactured in the usual way as a forged component be on which the roller shell, for example, by a removable shrink fit firmly and reliably attached becomes.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

A roller mill grinding roller is produced by weld depositing a ductile bainitic spheroidal graphite cast iron onto a core. A core is covered with a highly wear resistant casing of a ductile bainitic spheroidal graphite cast iron which has an elongation at fracture of 0.1-2.5% and a compressive strength of 1000-1800 MPa. Preferred Feature: The roller has a profiled surface formed by weld deposition a hard facing of a chromium-carbon alloy which typically contains (by wt.) 5.0% C, 3.0% Mn, 1.5% Si, 22.0% Cr, 7.2% Nb and 0.5% V.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Mahlwalze für die Zerkleinerung von spröden Mahlgütern in einer Gutbett-Walzenmühle, entsprechend dem Oberbegriff des Anspruches 1.The invention relates to a method for manufacturing a grinding roller for the comminution of brittle regrinds in a material bed roller mill, according to the Preamble of claim 1.

Es ist bereits allgemein bekannt, daß relativ spröde Mahlgüter, wie z.B. Zementrohmaterialien, Zementklinker, Erzmaterial, Kohle u.dgl. besonders wirtschaftlich bzw. energiesparend in einer sogenannten Gutbett-Walzenmühle zerkleinert werden können, in der zwei gegenläufig rotierend antreibbare Mahlwalzen mit verhältnismäßig hohem Druck gegeneinandergedrückt werden (vgl. z.B. Walter Duda, Cement-Data-Book, Bd.1, 3.Aufl., 1985, S.255 bis 261).It is already well known that relatively brittle Regrind such as Cement raw materials, cement clinker, Ore material, coal and the like particularly economical or energy-saving in a so-called Gutbett roll mill can be crushed in two in opposite directions rotating drivable grinding rollers with relatively high pressure against each other (cf. e.g. Walter Duda, Cement Data Book, Vol. 1, 3rd ed., 1985, pp. 255 to 261).

Da die Walzenoberflächen (Außenumfangsflächen) gerade bei den erwähnten spröden und abrasiven Mahlgütern sehr hohen Beanspruchungen sowohl hinsichtlich des Abriebs (Verschleißes) als auch hinsichtlich der Drücke ausgesetzt sind, wird der Walzenmantel jeder hier verwendeten Mahlwalze aus entsprechend widerstandsfähigem und insbesondere verschleißfestem Werkstoff hergestellt. Zu diesen Walzenwerkstoffen zählen vor allem Hartguß sowie legierte Hartwerkstoffe, die durch Auftragsschweißungen auf das Grundmaterial aufgebracht werden. Bei dieser Zerkleinerung in einer Gutbett-Walzenmühle bewirken die an den Walzenoberflächen bzw. Walzenmänteln auftretenden hohen Drücke, daß nach entsprechenden Lauf- bzw. Betriebszeiten der Walzenwerkstoff vor allem der heutzutage meistens verwendeten auftragsgeschweißten Walzenmäntel insbesondere im oberflächennahen Bereich ermüdet, abgesehen von dem zum Teil erheblichen Verschleiß. Diese Werkstoffermüdung führt dazu, daß die Standzeiten dieser Mahlwalzen begrenzt sind; dabei lassen sich die Walzenmäntel auch nicht mehr sinnvoll regenerieren.Because the roller surfaces (outer peripheral surfaces) are straight very much with the brittle and abrasive grinding materials mentioned high demands both with regard to abrasion (Wear) and exposed to the pressures the roller shell will be used here every Grinding roller made of accordingly resistant and especially made of wear-resistant material. To These roller materials mainly include chilled cast iron as well Alloyed hard materials by cladding be applied to the base material. At this Crushing in a material bed roller mill causes this occurring on the roll surfaces or roll shells high pressures that after appropriate running or Operating times of the roller material, especially those of today mostly used surfaced roll shells tired especially near the surface, apart from the sometimes considerable wear. This material fatigue leads to the The service lives of these grinding rollers are limited; leave with it the roller shells also no longer regenerate sensibly.

In der EP-B-563 564 ist daher eine Gutbett-Walzenmühle vorgeschlagen worden, in der Mahlwalzen verwendet werden, die entsprechend dem Oberbegriff des Anspruches 1 hergestellt sind, d.h. die insbesondere einen Walzenmantel aus einem verschleißfesten Hartguß besitzen, bei dem es sich u.a. aus einem hochverschleißfesten bainitischen Gußwerkstoff handeln kann. Das Besondere bei diesen bekannten Mahlwalzen besteht darin, daß auf die Oberfläche des Hartguß-Walzenmantels jeder Mahlwalze Profilierungen in Form von Schweißraupen aus verschleißfestem Auftragsschweißwerkstoff aufgebracht sind. Es hat sich zwar gezeigt, daß durch diese Herstellung der Mahlwalzen aus Hartguß mit Auftragsschweißungen eine deutlich höhere Druckfestigkeit und damit höhere Lebensdauer hinsichtlich Verschleiß als bei den weiter oben genannten auftragsgeschweißten Mahlwalzen erzielt werden kann. Bei diesen bekannten Mahlwalzen mit einem Walzenmantel aus Hartguß ist jedoch zu beachten, daß der Hartguß bzw. der Hartgußwerkstoff ein verhältnismäßig sprödes Verhalten besitzt. Letzteres kann vor allem bei verhältnismäßig stoßweiser bzw. schlagender Zerkleinerungsarbeit bzw. Beanspruchung der Mahlwalzen, wie es vor allem bei sehr spröden und grobstückigen Mahlgütern häufig der Fall ist, dazu führen, daß der Hartgußwerkstoff spontan bricht. Außerdem kann es bereits bei der Herstellung der Mahlwalzen zu unerwünschten Brüchen kommen; dies kann bereits bei einem Aufschrumpfen des Walzenmantels auf den Walzengrundkörper durch dabei entstehende Schrumpfspannungen geschehen.In EP-B-563 564 there is therefore a material bed roller mill proposed to be used in the grinding rollers which according to the preamble of claim 1 are manufactured, i.e. which in particular a roller shell from a wear-resistant chilled cast iron, at which is among others from a highly wear-resistant bainitic Cast material can act. The special thing about this known grinding rollers is that on the Surface of the chill roll shell of each grinding roller Profiles in the form of welding beads made of wear-resistant Cladding material applied are. It has been shown that by this production the milling castors made of chilled cast iron with build-up welding a significantly higher compressive strength and thus longer life in terms of wear than with the above-mentioned weld-welded grinding rollers can be achieved. With these known grinding rollers with a chilled cast iron roller jacket, please note that the chilled cast iron or the chilled cast iron material is a relative has brittle behavior. The latter can especially in the case of relatively intermittent or striking Shredding work or stress on the grinding rollers, as is especially the case with very brittle and large pieces Regrind is often the case, cause the hard cast material breaks spontaneously. Besides, it can already undesirable during the manufacture of the grinding rollers Breaks come; this can already happen with one Shrinking the roll cover onto the roll base due to shrinkage stresses happen.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der im Oberbegriff des Anspruches 1 vorausgesetzten Art in der Weise weiter zu verbessern, daß bei weiterhin relativ hoher Verschleiß- und Druckfestigkeit eine besonders hohe Betriebssicherheit des Walzenmantels (und damit der ganzen Mahlwalze) gegenüber Brüchen erzielt werden kann.The invention is therefore based on the object Method of the prerequisite in the preamble of claim 1 Way to further improve in such a way that still relatively high wear and pressure resistance particularly high operational reliability of the roll shell (and thus the entire grinding roller) against breakage can be achieved.

Diese Aufgabe wird erfindungsgemäß durch das Kennzeichen des Anspruches 1 gelöst.This object is achieved according to the invention by the indicator of claim 1 solved.

Vorteilhafte Ausgestaltungen und Weiterbildungen dieser Erfindung sind Gegenstand der Unteransprüche.Advantageous refinements and developments of these Invention are the subject of the dependent claims.

Ein wesentlicher Gedanke der vorliegenden Erfindung wird darin gesehen, daß der Walzenmantel aus einem duktilen bainitischen Sphäroguß mit einer Bruchdehnung von etwa 0,1 bis etwa 2,5 % und einer Druckfestigkeit von etwa 1.000 bis 1.800 MPa hergestellt wird, wobei ein bevorzugter Höchstwert der zuvor genannten Bruchdehnung bei etwa 2,0 % liegt. Im Vergleich zu den weiter oben beschriebenen bekannten Mahlwalzen (aus EP-B-563 564), bei denen der Walzenmantel aus relativ sprödem Hartguß hergestellt ist, ergibt sich durch die erfindungsgemäße Herstellung von Mahlwalzen ein Walzenmantel-Werkstoff, der sich neben seiner hohen Druckfestigkeit und Verschleißfestigkeit durch eine relativ große Zähigkeit auszeichnet, wodurch dieser Werkstoff und somit der daraus hergestellte Walzenmantel eine besonders hohe Sicherheit gegenüber Brüchen des Walzenmantels gewährleistet. Bei den der Erfindung zugrundeliegenden umfangreichen Versuchen konnte diese hohe Sicherheit gegenüber Brüchen sowie eine relativ hohe Druckfestigkeit des Werkstoffes nachgewiesen werden, d.h. bei diesem Walzenmantelwerkstoff treten auch bei relativ großen und ungleichmäßigen Belastungen während der Zerkleinerung von spröden Mahlgütern in einer Gutbettwalzenmühle keine Werkstoffermüdungen auf.An essential idea of the present invention is seen in the fact that the roll shell consists of a ductile bainitic nodular cast iron with an elongation at break of about 0.1 to about 2.5% and a compressive strength of about 1,000 to 1,800 MPa is produced, with a preferred maximum value of the aforementioned elongation at break is around 2.0%. Compared to the ones above known grinding rollers described (from EP-B-563 564), where the roll shell is made of relatively brittle chilled cast iron is produced, results from the invention Production of grinding rolls a roll shell material, which in addition to its high compressive strength and wear resistance due to its relatively high toughness distinguishes what this material and thus the roller jacket made therefrom a particularly high Security against breakage of the roller jacket guaranteed. In the extensive underlying the invention This high security could try Fractures and a relatively high compressive strength of the material, i.e. at this Roller jacket material also occur with relatively large ones and uneven loads during shredding of brittle regrind in a material bed roller mill no material fatigue.

Gemäß einer bevorzugten Ausführung der Erfindung wird eine Bruchdehnung des Gußwerkstoffes und somit des Walzenmantels von wenigstens etwa 0,5 %, also eine Bruchdehnung von etwa 0,5 bis 2,5 %, besonders bevorzugt von etwa 0,5 bis 2,0 %, und eine Druckfestigkeit von etwa 1.200 bis 1.600 MPa gewählt.According to a preferred embodiment of the invention an elongation at break of the cast material and thus the roll shell of at least about 0.5%, i.e. an elongation at break from about 0.5 to 2.5%, particularly preferably from about 0.5 to 2.0%, and a compressive strength of about 1,200 to 1,600 MPa selected.

Für besonders vorteilhaft wird es ferner angesehen, wenn hierbei der Walzenmantel mit einer Härte von etwa 42 bis 55 HRc, bevorzugt von etwa 45 bis 50 HRc, d.h. Härte nach Rockwell, hergestellt wird.It is also considered particularly advantageous if if here the roll shell with a hardness of about 42 to 55 HRc, preferably from about 45 to 50 HRc, i.e. Rockwell hardness.

Um bei der Zerkleinerung von spröden Mahlgütern in einer Gutbett-Walzenmühle stets ein zuverlässiges Einziehen von Mahlgut in den zwischen den beiden Mahlwalzen gebildeten Walzenspalt gewährleisten zu können, wird bei dieser erfindungsgemäßen Walzenherstellung auf der Außenumfangsfläche des Walzenmantels eine an sich bekannte Oberflächenprofilierung angebracht. Obwohl diese Oberflächenprofilierung generell bereits beim Gießen der Walzenmantels hergestellt bzw. ausgebildet werden kann, wird es im allgemeinen vorgezogen, diese Oberflächenprofilierung durch eine Auftragsschweißung von Hartwerkstoff auf die Außenumfangsfläche des Walzenmantels auszubilden. In order to shred brittle regrinds in one Gutbett roll mill always reliable feeding of regrind in the between the two grinding rollers To be able to ensure the nip formed in this roll production according to the invention on the Outer peripheral surface of the roll shell is known per se Surface profiling attached. Although these Surface profiling generally already during casting the roll shell are manufactured or formed , it is generally preferred to use this surface profiling by a weld overlay from Hard material on the outer circumferential surface of the roll shell to train.

Gemäß einer vielfach zweckmäßigen Ausführungsvariante besteht ferner die Möglichkeit, auf die Außenumfangsfläche des Walzenmantels zunächst mehrere komplette Zusatzschichten aus Hartwerkstoff durch Aufschweißung aufzubringen und auf die äußerste Zusatzschicht die Oberflächenprofilierungen aus Hartwerkstoff ebenfalls durch Hartauftragsschweißung zu bilden.According to a multi-purpose design variant there is also the possibility of on the outer peripheral surface of the roll shell initially several complete additional layers made of hard material by welding apply and on the outermost additional layer Surface profiling made of hard material also to be formed by hard surfacing.

Bei den genannten Versuchen konnte festgestellt und bestätigt werden, daß der erfindungsgemäß für den Walzenmantel verwendete Gußwerkstoff die zuvor erwähnten Auftragsschweißungen ausgezeichnet verträgt. Da bei diesem Gußwerkstoff - wie oben erwähnt - keine Werkstoffermüdung auftritt, ergibt sich der weitere Vorteil, daß verschlissene Auftragsschweißungen beliebig wiederholt und somit die Verschleißoberfläche des Walzenmantels entsprechend leicht und oft regeneriert werden kann. Aufgrund dieser Auftragsschweißungen auf den erfindungsgemäß verwendeten Gußwerkstoff ergibt sich ein äußerst verschleißfester Walzenmantel, der somit eine im Vergleich zu den bekannten Ausführungen besonders lange Lebensdauer besitzt. Letzteres wird noch dadurch unterstützt, daß - wie die Versuche ebenfalls gezeigt haben - der durch Auftragsschweißung aufgebrachte Hartwerkstoff noch härter ist als bei den oben erwähnten bekannten Ausführungen. Selbst wenn sich beim Erkalten des Hartauftragsschweißwerkstoffes Risse bilden sollten, dann handelt es sich doch nur um verhältnismäßig kurze Risse, die für die Verschleißfestigkeit und Druckfestigkeit und somit für die Lebensdauer des so hergestellten Walzenmantels unschädlich sind. In the experiments mentioned it was possible to determine and confirm be that the invention for the roll shell cast material used the previously mentioned surfacing tolerates excellently. Because with this Cast material - as mentioned above - no material fatigue occurs, there is the further advantage that worn overlay welds repeated any number of times and thus the wear surface of the roll shell can be regenerated accordingly easily and often. Because of these build-up welds on the invention used casting material results in an extreme wear-resistant roller jacket, which is therefore a Particularly long compared to the known versions Has lifespan. The latter is supported by that - as the experiments have also shown - the hard material applied by build-up welding is even harder than the known ones mentioned above Executions. Even if it cools down of the hard surfacing welding material should form cracks, then it is only a matter of proportion short cracks for wear resistance and Compressive strength and thus for the life of the sun manufactured roll shell are harmless.

Für die erfindungsgemäße Herstellung des Walzenmantels einer Mahlwalze seien nachfolgend Beispiele für typische Zusammensetzungen genannt.For the production of the roll shell according to the invention a grinding roller are examples of typical below Called compositions.

Für die Herstellung des Walzenmantels, d.h. für den eigentlichen Mantelkörper, kann ein duktiler bainitischer Sphäroguß aus einer Gußlegierung mit - in Gew-% - 3,0 - 3,5 % Kohlenstoff, 1,5 - 2,0 % Silizium, 0,3 - 0,4 % Mangan, 0,05 % Phosphor, 1,5 - 4,0 % Nickel, 0,7 - 1,0 % Molybdän und 0,04 - 0,07 % Magnesium ausgewählt werden, wobei bei einer bevorzugten Ausführung der Anteil an Silizium auch etwa 1,8 bis 2,0 Gew.-% betragen kann.For the manufacture of the roll shell, i.e. for the real one Sheath body, can be a ductile bainitic Ductile iron from a cast alloy with - in% by weight - 3.0 - 3.5% carbon, 1.5 - 2.0% silicon, 0.3 - 0.4% Manganese, 0.05% phosphorus, 1.5 - 4.0% nickel, 0.7 - 1.0 % Molybdenum and 0.04 - 0.07% magnesium are selected, in a preferred embodiment the proportion of silicon can also be about 1.8 to 2.0% by weight.

Als Hartauftragsschweißwerkstoff wird vorzugsweise eine hochverschleißfeste Chrom-Kohlenstoff-Legierung verwendet, in der sich neben Chromkarbiden noch Sonderkarbide ausbilden. Alternativ dazu kann der Hartwerkstoff auch durch hochverschleißfeste Wolframkarbid-Auftragsschweißungen gebildet werden.As the hard overlay welding material is preferably one highly wear-resistant chrome-carbon alloy used, in addition to chrome carbides there are also special carbides form. Alternatively, the hard material can also thanks to highly wear-resistant tungsten carbide surfacing be formed.

Nach einem typischen Beispiel wird der Hartauftragsschweißwerkstoff durch eine Hartlegierung mit - in Gew-% - etwa 5,0 % Kohlenstoff, etwa 2,0 % Mangan, etwa 1,5 % Silizium, etwa 22,0 % Chrom, etwa 7,2 % Niobium und etwa 0,5 % Vanadium gebildet.According to a typical example, the hard overlay welding material through a hard alloy with - in % By weight - about 5.0% carbon, about 2.0% manganese, about 1.5% silicon, about 22.0% chromium, about 7.2% niobium and formed about 0.5% vanadium.

Bei dieser erfindungsgemäßen Herstellung der Mahlwalze und insbesondere des Walzenmantels können die Werkstoffeigenschaften des duktilen bainitischen Sphärogusses durch gesteuerte Abkühlung und/oder Wärmebehandlung des Walzenmantels in der gewünschten bzw. erforderlichen Weise eingestellt werden. In this production of the grinding roller according to the invention and in particular the roll shell can affect the material properties of ductile bainitic ductile iron by controlled cooling and / or heat treatment of the roll shell in the desired or required Way to be set.

Es sei noch darauf hingewiesen, daß die erfindungsgemäß hergestellte Mahlwalze in konstruktiver bzw. baulicher Hinsicht sowie in ihrer Formgebung ansonsten generell gleichartig ausgeführt sein kann, wie es bei Gutbett-Walzenmühlen allgemein bekannt und auch im wesentlichen in der erwähnten EP-B 563 564 beschrieben ist. Dies bedeutet somit, daß diese Mahlwalze generell zweiteilig aus dem Walzengrundkörper (teilweise auch als Walzenwelle bezeichnet) und dem darauf fest aufgebrachten Walzenmantel besteht. Der Walzengrundkörper kann dabei in üblicher Weise als geschmiedeter Bauteil hergestellt sein, auf den der Walzenmantel beispielsweise durch einen lösbaren Schrumpfsitz fest und zuverlässig befestigt wird.It should also be noted that the invention manufactured grinding roller in a constructive or structural In terms of general terms and shape can be carried out in the same way as it is with Gutbett roll mills well known and also essentially is described in the mentioned EP-B 563 564. this means thus that this grinding roller generally in two parts from the roller body (sometimes also as roller shaft referred to) and firmly attached to it Roll jacket exists. The roller body can manufactured in the usual way as a forged component be on which the roller shell, for example, by a removable shrink fit firmly and reliably attached becomes.

Schließlich seien nochmals einige wesentliche Vorteile des aus duktilem, bainitischem Sphäroguß hergestellten Walzenmantels angeführt:

  • der erfindungsgemäße Walzenmantel besitzt eine ähnlich hohe Druckfestigkeit wie bekannte Walzen aus Hartgußwerkstoffen, ohne daß bei ihm jedoch Werkstoffermüdungen auftreten, mit der Folge einer besonders hohen Standzeit;
  • die hohe Druckfestigkeit des duktilen bainitischen Sphärogusses erlaubt höhere Mahldrücke als bei auftragsgeschweißten Mahlwalzen;
  • neben der ausgezeichneten Druckfestigkeit besitzt der aus dem duktilen bainitischen Sphäroguß hergestellte Walzenmantel besonders gute Zähigkeitseigenschaften, wodurch er besonders hohe Sicherheiten gegenüber einem spröden Versagen bzw. Sprödbrüchen aufweist;
  • durch sinnvolle Variationen in der chemischen Analyse des Gußwerkstoffes sowie durch eine gesteuerte Abkühlung und/oder Wärmebehandlung des Walzenmantels nach dem Guß können die Werkstoffeigenschaften optimal den Beanspruchungen bei der Zerkleinerung in einer Gutbett-Walzenmühle angepaßt werden.
Finally, there are some key advantages of the roll shell made from ductile, bainitic nodular cast iron:
  • the roll shell according to the invention has a similarly high compressive strength as known rolls made of hard cast materials, but without material fatigue occurring, with the consequence of a particularly long service life;
  • The high compressive strength of the ductile bainitic nodular cast iron allows higher grinding pressures than with welded-on grinding rollers;
  • In addition to the excellent compressive strength, the roll jacket made from ductile bainitic nodular cast iron has particularly good toughness properties, as a result of which it has particularly high security against brittle failure or brittle fractures;
  • through sensible variations in the chemical analysis of the cast material as well as through a controlled cooling and / or heat treatment of the roll shell after casting, the material properties can be optimally adapted to the stresses during comminution in a material bed roll mill.

Claims (11)

Verfahren zur Herstellung einer Mahlwalze für die Zerkleinerung von spröden Mahlgütern in einer Gutbett-Walzenmühle, in der zwei gegenläufig rotierende Mahlwalzen mit hohem Druck gegeneinandergedrückt werden, wobei auf einem Walzengrundkörper ein Walzenmantel fest aufgebracht und dieser Walzenmantel aus einem hochverschleißfesten bainitischen Gußwerkstoff hergestellt wird,
dadurch gekennzeichnet,
daß der Walzenmantel aus einem duktilen bainitischen Sphäroguß mit einer Bruchdehnung von etwa 0,1 bis etwa 2,5 % und einer Druckfestigkeit von etwa 1.000 bis etwa 1.800 MPa hergestellt wird.Process for producing a grinding roller for the comminution of brittle grinding materials in a material bed roller mill, in which two counter-rotating grinding rollers are pressed against one another with high pressure, a roller shell being firmly applied to a roller base body and this roller shell being produced from a highly wear-resistant bainitic cast material,
characterized,
that the roll shell is made from a ductile bainitic nodular cast iron with an elongation at break of about 0.1 to about 2.5% and a compressive strength of about 1,000 to about 1,800 MPa. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine Bruchdehnung des Walzenmantels von wenigstens etwa 0,5 % und eine Druckfestigkeit von etwa 1.200 bis 1.600 MPa gewählt wird.A method according to claim 1, characterized in that an elongation at break of the roll shell of at least about 0.5% and a compressive strength of about 1,200 to 1,600 MPa is selected. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Walzenmantel mit einer Härte von etwa 42 bis 55 HRc (Härte nach Rockwell) hergestellt wird.A method according to claim 1, characterized in that the roll shell with a hardness of about 42 to 55 HRc (Rockwell hardness) is produced. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß auf der Außenumfangsfläche des Walzenmantels eine Oberflächenprofilierung aufgebracht wird.A method according to claim 1, characterized in that on the outer peripheral surface of the roll shell surface profiling is applied. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Oberflächenprofilierung durch eine Auftragsschweißung von Hartwerkstoff auf die Außenumfangsfläche des Walzenmantels gebildet wird.A method according to claim 4, characterized in that the surface profiling by surfacing of hard material on the outer peripheral surface of the roll shell is formed. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß auf die Außenumfangsfläche des Walzenmantels zunächst mehrere komplette Zusatzschichten aus Hartwerkstoff durch Auftragsschweißung aufgebracht und auf die äußerste Zusatzschicht die Oberflächenprofilierungen aus Hartwerkstoff ebenfalls durch Hartauftragsschweißung gebildet werden.A method according to claim 4, characterized in that on the outer peripheral surface of the roll shell initially several complete additional layers made of hard material applied by surfacing and on the outermost additional layer the surface profiles made of hard material also by hard overlay welding be formed. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß als Hartauftragsschweißwerkstoff eine hochverschleißfeste Chrom-Kohlenstoff-Legierung verwendet wird, in der sich neben Chromkarbiden noch Sonderkarbide ausbilden.A method according to claim 5 or 6, characterized in that that as a hard overlay welding material highly wear-resistant chrome-carbon alloy used in which there is still chromium carbide Form special carbides. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß der Hartauftragswerkstoff durch eine Hartlegierung mit - in Gew-% - etwa 5,0 % Kohlenstoff, etwa 3,0 % Mangan, etwa 1,5 % Silizium, etwa 22,0 % Chrom, etwa 7,2 % Niobium und etwa 0,5 % Vanadium gebildet wird.A method according to claim 7, characterized in that the hard coating material is made of a hard alloy with - in% by weight - about 5.0% carbon, about 3.0% manganese, about 1.5% silicon, about 22.0% Chromium, about 7.2% niobium and about 0.5% vanadium is formed. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß der Hartwerkstoff durch hochverschleißfeste Wolframkarbid-Auftragsschweißungen gebildet wird.A method according to claim 5 or 6, characterized in that that the hard material through highly wear-resistant Tungsten carbide build-up welds formed becomes. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß für die Herstellung des Walzenmantels ein bainitischer Sphäroguß aus einer Gußlegierung mit - in Gew-% - 3,0 - 3,5 % Kohlenstoff, 1,5 - 2,0 % Silizium, 0,3 - 0,4 % Mangan, 0,05 % Phosphor, 1,5 - 4,0 % Nickel, 0,7 - 1,0 % Molybdän und 0,04 - 0,07 % Magnesium ausgewählt wird.A method according to claim 1, characterized in that for the manufacture of the roll shell a bainitic Ductile iron from a cast alloy with - in % By weight - 3.0 - 3.5% carbon, 1.5 - 2.0% silicon, 0.3 - 0.4% manganese, 0.05% phosphorus, 1.5 - 4.0% nickel, 0.7 - 1.0% molybdenum and 0.04 - 0.07% magnesium is selected. Verfahren nach Anspruch 1 oder 10, dadurch gekennzeichnet, daß die Werkstoffeigenschaften des bainitischen Sphärogusses durch gesteuerte Abkühlung und/oder Wärmebehandlung des Walzenmantels eingestellt werden.A method according to claim 1 or 10, characterized in that that the material properties of the bainitic Ductile iron through controlled cooling and / or heat treatment of the roll shell set become.
EP98120943A 1997-11-12 1998-11-04 Method for manufacturing a milling roller Expired - Lifetime EP0916407B2 (en)

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DE19750144 1997-11-12
DE19750144A DE19750144A1 (en) 1997-11-12 1997-11-12 Process for producing a grinding roller

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CN103658551A (en) * 2013-11-27 2014-03-26 湖州中联机械制造有限公司 Manufacturing method for grinding roller of large-scale cement grinding mill
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DE102004043562A1 (en) * 2004-09-09 2006-03-30 Khd Humboldt Wedag Gmbh Press roller ring bandage and method for its production
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WO2014173877A3 (en) * 2013-04-23 2014-12-24 Thyssenkrupp Industrial Solutions Ag Device for comminuting abrasive materials
CN103658551A (en) * 2013-11-27 2014-03-26 湖州中联机械制造有限公司 Manufacturing method for grinding roller of large-scale cement grinding mill

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DE59803601D1 (en) 2002-05-08
ES2174373T3 (en) 2002-11-01
DK0916407T4 (en) 2005-12-12
EP0916407B2 (en) 2005-08-03
DK0916407T3 (en) 2002-07-29
DE19750144A1 (en) 1999-06-02
ZA9810026B (en) 1999-05-05
EP0916407B1 (en) 2002-04-03
ES2174373T5 (en) 2006-02-01
US6203588B1 (en) 2001-03-20
BR9804606A (en) 1999-11-03

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