EP0916407B1 - Method for manufacturing a milling roller - Google Patents
Method for manufacturing a milling roller Download PDFInfo
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- EP0916407B1 EP0916407B1 EP98120943A EP98120943A EP0916407B1 EP 0916407 B1 EP0916407 B1 EP 0916407B1 EP 98120943 A EP98120943 A EP 98120943A EP 98120943 A EP98120943 A EP 98120943A EP 0916407 B1 EP0916407 B1 EP 0916407B1
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- Prior art keywords
- roll
- hard
- tyre
- build
- welding
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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 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 0.1 to 2.5% and a compressive strength of 1,000 to 1,800 MPa is produced, with a preferred maximum value of the aforementioned elongation at break is 2.0%.
- an elongation at break of the cast material and thus the roll shell of at least 0.5% i.e. an elongation at break from 0.5 to 2.5%, particularly preferably from 0.5 to 2.0%, and a compressive strength of 1,200 to 1,600 MPa selected.
- roller jacket has a hardness of 42 to 55 HRc, preferably 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)
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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 grobstükkigen 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.
In der Fachzeitschrift "ZKG International", Nr. 7/1997, Seiten 348 bis 392, sind "Betriebserfahrungen mit dem Verschleißschutz bei Hochdruck-Rollenmühlen" (Gutbett-Walzenmühlen) beschrieben, wobei es insbesondere um die Ausbildung der dort verwendeten Walzen hinsichtlich der Verschleißfestigkeit verschiedener Werkstoffe für die zugehörigen Walzenmäntel und beim Einsatz dieser Walzenmühlen in der Zementindustrie geht. Im Hinblick auf den Verschleißschutz werden vor allem drei verschiedene Ausführungen hervorgehoben, nämlich die sogenannte Auftragsschweißung, die bandagierte oder segmentierte Gußpanzerung und die sogenannte Noppenpanzerung. Als eine besonders positive Entwicklung wird dabei der Einsatz von Bandagen aus legiertem Sphäroguß bezeichnet. Auf S.388, linke Sp., letzter Abs., ist erwähnt, daß Sphäroguß durch Zulegierung eine hohe Druckfestigkeit erreichen kann; er in bezug auf seine Härte jedoch unter dem Hartgußwerkstoff Ni-Hard 4 liegt. Seine Verschleißfestigkeit sei deshalb wesentlich geringer als bei anderen Hartgußwerkstoffen. Sphäroguß habe jedoch den Vorteil, schweißbar zu sein, so daß der Verschleißschutz über Hartlagenaufschweißung aufgebracht werden könne, wobei die Bruchdehnung beim Sphäroguß höher als bei anderen Gußwerkstoffen liege. Nähere Angaben für die Bruchdehnung, die Druckfestigkeit oder für die Legierungszusammensetzungen sind in dieser Veröffentlichung nicht enthalten. In the trade journal "ZKG International", No. 7/1997, Pages 348 to 392, are "Operating Experience with the Wear protection for high-pressure roller mills "(material bed roller mills) described, in particular the Training of the rollers used there with regard to Wear resistance of various materials for the associated roller jackets and when using these roller mills in the cement industry. With regard the wear protection are mainly three different Emphasized versions, namely the so-called surfacing, the bandaged or segmented cast armor and the so-called stud armor. As one Use is particularly positive called bandages made of alloyed nodular cast iron. On S.388, left column, last paragraph, it is mentioned that nodular cast iron achieve high compressive strength through alloying can; he however under in terms of his harshness the hard cast material Ni-Hard 4. Its wear resistance is therefore much less than that of others Hartgußwerkstoffen. Ductile iron did, however Advantage of being weldable, so that wear protection be applied by hard layer welding can, the elongation at break being higher than nodular cast iron with other cast materials. Details for elongation at break, compressive strength or for the alloy compositions are in this release not included.
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 0,1 bis 2,5 % und einer Druckfestigkeit von 1.000 bis 1.800 MPa hergestellt wird, wobei ein bevorzugter Höchstwert der zuvor genannten Bruchdehnung bei 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 0.1 to 2.5% and a compressive strength of 1,000 to 1,800 MPa is produced, with a preferred maximum value of the aforementioned elongation at break is 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 0,5 %, also eine Bruchdehnung von 0,5 bis 2,5 %, besonders bevorzugt von 0,5 bis 2,0 %, und eine Druckfestigkeit von 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 0.5%, i.e. an elongation at break from 0.5 to 2.5%, particularly preferably from 0.5 to 2.0%, and a compressive strength of 1,200 to 1,600 MPa selected.
Für besonders vorteilhaft wird es ferner angesehen, wenn hierbei der Walzenmantel mit einer Härte von 42 bis 55 HRc, bevorzugt von 45 bis 50 HRc, d.h. Härte nach Rockwell, hergestellt wird.It is also considered particularly advantageous if if the roller jacket has a hardness of 42 to 55 HRc, preferably 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 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 äuβerst 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 The cast material used is extremely 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 Versions. 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 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 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-% - 5,0 % Kohlenstoff, 2,0 % Mangan, 1,5 % Silizium, 22,0 % Chrom, 7,2 % Niobium und 0,5 % Vanadium gebildet.According to a typical example, the hard overlay welding material through a hard alloy with - in % By weight - 5.0% carbon, 2.0% manganese, 1.5% silicon, 22.0% chromium, 7.2% niobium and 0.5% vanadium formed.
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.
- 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 shell made from ductile bainitic nodular cast iron has particularly good toughness properties, which means that it has particularly high security against brittle failure or brittle fractures;
- through sensible variations in the chemical analysis of the cast material and through 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)
- Method of producing a grinding roll for the comminution of brittle feed materials in a material bed roll mill in which two grinding rolls which can be driven in rotation in opposite directions are pressed against one another with a high pressure, wherein a roll tyre is firmly applied to a basic roll body and this roll tyre is produced from a highly wear-resistant bainitic cast material, characterised in that the roll tyre is produced from a ductile bainitic spheroidal graphite cast material with a breaking elongation of 0.1 to 2.5% and a compression strength of 1,000 to 1,800Mpa.
- Method as claimed in Claim 1, characterised in that a breaking elongation of the cast material and thus of the roll tyre of at least 0.5% and a compression strength of 1,200 to 1,600 MPa is chosen.
- Method as claimed in Claim 1, characterised in that the roll tyre is produced with a hardness of 42 to 55 HRc (Rockwell hardness).
- Method as claimed in Claim 1, characterised in that a surface profiling is applied to the outer circumferential surface of the grinding roll.
- Method as claimed in Claim 4, characterised in that the surface profiling is formed by build-up welding of hard material onto the outer circumferential surface of the roll tyre.
- Method as claimed in Claim 4, characterised in that first of all a plurality of complete additional layers of hard material are applied by build-up welding onto the outer circumferential surface of the roll tyre and the surface profilings of hard material are formed on the outermost additional layer, likewise by hard build-up welding.
- Method as claimed in Claim 5 or 6, characterised in that a highly wear-resistant chromium/carbon alloy in which special carbides form apart from chromium carbides is used as hard build-up welding material.
- Method as claimed in Claim 7, characterised in that the hard build-up welding material is formed by a hard alloy with - in % by weight - 5.0% carbon, 3.0% manganese, 1.5% silicon, 22.0% chromium, 7.2% niobium and 0.5% vanadium.
- Method as claimed in Claim 5 or 6, characterised in that the hard material is formed by highly wear-resistant tungsten carbide build-up welds.
- Method as claimed in claim 1, characterised in that for the production of the roll tyre a ductile bainitic spheroidal graphite cast material consisting of 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 chosen.
- Method as claimed in Claim 1 or 10, characterised in that the material characteristics of the ductile bainitic spheroidal graphite cast material are set by controlled cooling and/or heat treatment of the roll tyre.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19750144A DE19750144A1 (en) | 1997-11-12 | 1997-11-12 | Process for producing a grinding roller |
DE19750144 | 1997-11-12 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0916407A1 EP0916407A1 (en) | 1999-05-19 |
EP0916407B1 true EP0916407B1 (en) | 2002-04-03 |
EP0916407B2 EP0916407B2 (en) | 2005-08-03 |
Family
ID=7848513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98120943A Expired - Lifetime EP0916407B2 (en) | 1997-11-12 | 1998-11-04 | Method for manufacturing a milling roller |
Country Status (7)
Country | Link |
---|---|
US (1) | US6203588B1 (en) |
EP (1) | EP0916407B2 (en) |
BR (1) | BR9804606A (en) |
DE (2) | DE19750144A1 (en) |
DK (1) | DK0916407T4 (en) |
ES (1) | ES2174373T5 (en) |
ZA (1) | ZA9810026B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013104098A1 (en) | 2013-04-23 | 2014-10-23 | Thyssenkrupp Industrial Solutions Ag | Device for the comminution of abrasive materials |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10332580B4 (en) * | 2003-07-17 | 2010-02-11 | Gigaset Communications Gmbh | Telephone handset and acoustic transducer for such a telephone handset |
DE102004043562B4 (en) | 2004-09-09 | 2016-09-29 | Khd Humboldt Wedag Gmbh | Press roller ring bandage and method for its production |
DE102006008115A1 (en) * | 2006-02-20 | 2007-08-30 | Siemens Ag | Milling tool e.g. rod mill, for milling of stone, has coating that is made of wear-resistant material and has ductile metallic base material with hard material particles, where base material is nickel or nickel alloy |
US20100151268A1 (en) * | 2008-12-11 | 2010-06-17 | Flsmidth A/S | Wear-resistant hard surfacing method and article |
DE102010024221A1 (en) | 2010-06-18 | 2011-12-22 | Khd Humboldt Wedag Gmbh | Profiled bandage for a roller press |
JP5542104B2 (en) * | 2011-08-09 | 2014-07-09 | 住友ゴム工業株式会社 | Method for evaluating the wear resistance of tires |
US9375718B2 (en) | 2011-10-18 | 2016-06-28 | Diamond Power International, Inc. | Shaft-to-roller attachment for clinker grinder roller |
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 |
Family Cites Families (15)
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US2771358A (en) * | 1954-07-16 | 1956-11-20 | Int Nickel Co | Machine elements for crushers |
DE1120242B (en) * | 1959-06-24 | 1961-12-21 | Hoesch Ag | Process for applying wear-resistant layers to rollers u. like |
DE3116227C2 (en) * | 1981-04-23 | 1983-12-01 | Kubota Ltd., Osaka | Composite cast work roll and method for making the same |
US4396442A (en) * | 1981-05-15 | 1983-08-02 | Kubota Ltd. | Ductile cast iron roll and a manufacturing method thereof |
FR2522291A1 (en) * | 1982-03-01 | 1983-09-02 | Pont A Mousson | CENTRIFUGAL CAST IRON WITH SPHEROIDAL GRAPHITE AND MANUFACTURING METHOD THEREOF |
US4541878A (en) * | 1982-12-02 | 1985-09-17 | Horst Muhlberger | Cast iron with spheroidal graphite and austenitic-bainitic mixed structure |
US4484953A (en) * | 1983-01-24 | 1984-11-27 | Ford Motor Company | Method of making ductile cast iron with improved strength |
FR2575683B1 (en) * | 1985-01-04 | 1987-01-30 | Pont A Mousson | PROCESS AND PLANT FOR THE CONTINUOUS MANUFACTURE OF CAST IRON PIPES WITH SPHEROIDAL GRAPHITE WITH CONTROLLED STRUCTURE |
US4880477A (en) * | 1988-06-14 | 1989-11-14 | Textron, Inc. | Process of making an austempered ductile iron article |
DE3926232A1 (en) * | 1988-09-22 | 1990-03-29 | Kloeckner Humboldt Deutz Ag | WEAR-RESISTANT ROLL COATING FOR THE ROLLERS OF ROLLING PRESSES AND METHOD FOR CONSTRUCTING THE ROLLING COATING |
JP2709103B2 (en) * | 1988-11-28 | 1998-02-04 | 日本ピストンリング株式会社 | Rocker arm |
DE3843173A1 (en) * | 1988-12-22 | 1990-07-05 | Kloeckner Humboldt Deutz Ag | WEAR-RESISTANT SURFACE ARMORING FOR THE ROLLS OF ROLLING MACHINES, IN PARTICULAR HIGH PRESSURE ROLLING PRESSES |
DE4134134A1 (en) * | 1991-10-15 | 1993-04-22 | Castolin Sa | Coating cast iron@ parts with wear-resistant layer - utilises nickel@, cobalt@, or iron@-based alloy with copper@ or chromium@ or silicon@ or boron@ and additives to avoid high transitional hardness gradients |
DE4210395A1 (en) * | 1992-03-30 | 1993-10-07 | Krupp Polysius Ag | Roller mill |
SE504707C2 (en) * | 1995-07-14 | 1997-04-07 | Sandvik Ab | Composite wall with cemented carbide and cast iron |
-
1997
- 1997-11-12 DE DE19750144A patent/DE19750144A1/en not_active Withdrawn
-
1998
- 1998-11-03 ZA ZA9810026A patent/ZA9810026B/en unknown
- 1998-11-04 EP EP98120943A patent/EP0916407B2/en not_active Expired - Lifetime
- 1998-11-04 ES ES98120943T patent/ES2174373T5/en not_active Expired - Lifetime
- 1998-11-04 DK DK98120943T patent/DK0916407T4/en active
- 1998-11-04 DE DE59803601T patent/DE59803601D1/en not_active Expired - Lifetime
- 1998-11-10 BR BR9804606-3A patent/BR9804606A/en not_active IP Right Cessation
- 1998-11-11 US US09/189,667 patent/US6203588B1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013104098A1 (en) | 2013-04-23 | 2014-10-23 | Thyssenkrupp Industrial Solutions Ag | Device for the comminution of abrasive materials |
WO2014173877A2 (en) | 2013-04-23 | 2014-10-30 | Thyssenkrupp Industrial Solutions Ag | Device for comminuting abrasive materials |
Also Published As
Publication number | Publication date |
---|---|
US6203588B1 (en) | 2001-03-20 |
DE19750144A1 (en) | 1999-06-02 |
BR9804606A (en) | 1999-11-03 |
EP0916407A1 (en) | 1999-05-19 |
DE59803601D1 (en) | 2002-05-08 |
ES2174373T3 (en) | 2002-11-01 |
DK0916407T4 (en) | 2005-12-12 |
ZA9810026B (en) | 1999-05-05 |
EP0916407B2 (en) | 2005-08-03 |
DK0916407T3 (en) | 2002-07-29 |
ES2174373T5 (en) | 2006-02-01 |
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