EP0659108A1 - Presses a rouleaux, notamment pour broyer des substances fortement abrasives - Google Patents

Presses a rouleaux, notamment pour broyer des substances fortement abrasives

Info

Publication number
EP0659108A1
EP0659108A1 EP94925371A EP94925371A EP0659108A1 EP 0659108 A1 EP0659108 A1 EP 0659108A1 EP 94925371 A EP94925371 A EP 94925371A EP 94925371 A EP94925371 A EP 94925371A EP 0659108 A1 EP0659108 A1 EP 0659108A1
Authority
EP
European Patent Office
Prior art keywords
wear
roll
resistant
base body
hard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94925371A
Other languages
German (de)
English (en)
Other versions
EP0659108B1 (fr
Inventor
Werner Plagemann
Wolfgang Schütze
Harald Günter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Koeppern GmbH and Co KG
Original Assignee
Maschinenfabrik Koeppern GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6493278&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0659108(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Maschinenfabrik Koeppern GmbH and Co KG filed Critical Maschinenfabrik Koeppern GmbH and Co KG
Priority to DE9422077U priority Critical patent/DE9422077U1/de
Publication of EP0659108A1 publication Critical patent/EP0659108A1/fr
Application granted granted Critical
Publication of EP0659108B1 publication Critical patent/EP0659108B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y10T29/49563—Fabricating and shaping roller work contacting surface element with coating or casting about a core

Definitions

  • Roller presses especially for crushing highly abrasive substances
  • the invention relates to a roller press, in particular for crushing strongly abrasive materials, with at least two press rollers, each of which has a wear layer arranged on a base body, the wear layer having essentially flat zones made of a highly wear-resistant material and the spaces between the highly wear-resistant zones are filled with a material of different wear resistance.
  • Roller presses have been widely used in industry, and their uses can essentially be divided into three groups of briquetting, compacting and comminution. In all three cases, the press rollers exert a more or less high pressure load on the materials to be processed. Depending on the profiling of the press rolls, in addition to this pressure load, there is also a sliding load on the roll surface. The intensity of the sliding stress essentially depends on the amount of pressure applied to the rollers, the profile of the roller surface and the properties of the materials to be processed. This stress can cause severe wear on the rollers, particularly when there are high pressing forces.
  • REPLACEMENT & L ⁇ TT abrasive substances such as glass powder, slag or iron and non-ferrous metals must be processed.
  • Autogenous wear protection is known in the case of comminution, in which the roller surface is covered by particles of the substance to be processed which settle into the interstices of knobs arranged on the roller surface. This oxy-fuel wear protection is not suitable for briquetting and offers no security against bursting out of the stored, fine-grained particles of the material to be processed.
  • cladding there are process-related restrictions regarding the alloy composition of the weld metal.
  • a generic roller press in particular a grinding roller, is known from EP-A-0516952.
  • a roller press is described, in which numerous basic holes are arranged in the peripheral area, into which pin-shaped pieces of material are inserted.
  • the main part of each stattför ige ⁇ material piece is in the roll body, while the rest protrudes from this.
  • the spaces between the hedgehog-shaped pin-shaped material pieces protruding from the roller base body can be filled with a ceramic material mixed with plastic.
  • As the wear-resistant pieces of material generally wear out more slowly than the material in the gaps, a profiled roller surface forms during operation. -The advantage is the better draw-in capacity and thus the higher throughput.
  • the manufacture of such known roller presses is very time-consuming due to the introduction of the numerous anchoring base holes in the roller base body and is therefore associated with high costs. Furthermore, the risk of pins breaking out is very great with this solution.
  • roller press of the type mentioned at the outset has a long service life and can be used for all applications (briquetting, compacting and crushing) and is easy to manufacture.
  • the object of the present invention is achieved in that the intermediate material is a sinterable composite material and the highly wear-resistant zones are formed from hard bodies produced by hot isostatic pressing, the intermediate material and the material of the wear-resistant zones being fastened to the base body by a hot isostatic pressing process and the wear resistance of
  • Intermediate material is essentially slightly higher or lower than the wear resistance of the hard body in accordance with a desired profiling which is established by wear.
  • the wear layer according to the invention is impure powder metallurgical hard layer, which has flat zones and filled interspaces with different wear properties in each case. This results in a profiling on the roller surface after a certain period of use, which brings about the desired better absorption of the material to be processed. Since the zone material and the composite material are in each case powder-metallurgically manufactured materials, these can be attached to the roller base body by hot isostatic pressing. The hot isostatic pressing process ensures that the entire wear layer has a connection to the roller base body which is so strong that individual components of the wear layer cannot be removed from it. Powder-metallurgical hard layers which are produced by hot isostatic pressing are known in the prior art. However, they have never been used as a wear layer in roller presses.
  • Hard body material or the interspace material is surrounded by a relatively ductile material.
  • an anchor of certain components of the wear layer in the roll body is no longer necessary with hot isostatic J mounting.
  • the solution according to the invention is, as it were, suitable for the briquetting, compacting and comminution of strongly abrasive substances, the service life being appreciably increased.
  • the ratio of the wear resistance of the composite material and the wear resistance of the hard body can be matched to the abrasive material to be processed. This is not a noteworthy problem, particularly in the production of such a wear layer, because the powder-metallurgical materials with respect to their composition in each case can be coordinated according to the application.
  • the overall level of wear resistance of the two materials can also be raised or lowered.
  • the hard bodies are preferably at least partially connected to the composite material in a cohesive manner on their circumference embedded in the composite material. Such a connection can inevitably be achieved by the hot isostatic pressing process and is therefore very easy to carry out.
  • the hard bodies and the interspace material each have a diffusion area at their contact points, which leads to very strong adhesion of the two materials to one another. .
  • Optimal profiling can be achieved in the operation of the roller press in that the area of the hard body takes up approx. 60% to 90% of the total area of the active wear layer.
  • the active wear layer is understood to mean the area of the wear layer that takes part in the processing of the abrasive substances.
  • the highly wear-resistant zones are particularly easy to manufacture if the hard bodies are in the form of platelets.
  • Such platelet-shaped hard bodies can e.g. applied in advance on the roller body and then the spaces are filled with composite material.
  • the shape of the platelet-shaped hard body can be arbitrary.
  • the service life can in particular be increased considerably if the wear layer has ceramic components.
  • the wear layer preferably has a very fine-grained structure, as a result of which greater strength, hardness, toughness and notch impact energy is achieved.
  • the wear layer is applied over the entire surface of the working area of the press roll.
  • An embodiment is also preferred in which the wear layer is arranged between the circumferential webs which laterally delimit the work area and which extend radially outward to the roller base body.
  • the hard layer is surrounded at its edge by an enclosure formed by means of the webs, which prevents the lateral edges of the hard layer from breaking out due to impact and edge loads.
  • a further embodiment suggests that a plurality of pocket-shaped depressions are introduced into the outer jacket of the roll base body in the working area of the press roll, in each case the wear layer being accommodated, in each case uniformly distributed over the circumference.
  • the press roll can have a profiled surface, preferably a briquette profile.
  • the wear layer particularly keeps the sliding movements on the surface of the individual briquette profiles in the press roll stand, whereby a desired shape tolerance can be provided during a significant service life.
  • the roller base body can advantageously have an essentially cylindrical receiving region, on the circumference of which a plurality of base body segments carrying the powder-metallurgical wear layer on the outside are detachably arranged.
  • the wear layer can be produced particularly easily, even with relatively large press roll diameters.
  • the base body segments preferably form a closed ring around the receiving area.
  • the wear layer is applied to a closed bandage, which is arranged on the roller base body in a form-fitting or frictional manner.
  • the hard layer can be arranged on the roller base body with relatively little effort.
  • appropriate setting of the material, especially a ductile material the webs the formation of cracks due to shrinkage stresses are avoided.
  • the process includes the following steps: a) applying a highly wear-resistant material to a base part, for example a roller base body, so that essentially flat, evenly distributed zones are formed;
  • the method offers the advantage of producing a wear layer that has very different wear properties by merely changing some process or material parameters. For this reason, e.g. the wear layer of a press roll can be adapted in its wear behavior to the abrasive material to be processed.
  • hard bodies can be produced from the highly wear-resistant material by hot isostatic pressing before it is applied to the base part.
  • the hard bodies can thus have any shape and be applied to the base part in accordance with the profile desired later.
  • the hot isostatic pressing process can be controlled in such a way that the wear resistance of the hard body and the wear resistance of the composite materials filling the interstices differ only slightly, the wear resistance of the hard body being higher or lower depending on the desired profiling caused by the wear than the wear resistance of the interspace material . Since the wear resistance deviates only slightly from one another, it is ensured that the overall wear resistance of the wear layer is relatively high, but a prefiltration is set to improve the absorption of the abrasive material to be processed.
  • the wear resistance can be adjusted accordingly by the hard phase p content supplied in the hard body material or in the composite material.
  • the wear behavior of the zones and the filled interstices can thus be set by simple different mixing ratios of the selected powder metallurgical materials, - which also changes the overall wear behavior of the wear layer.
  • FIG. 2 shows a second embodiment of a press roll with a bandage
  • FIG. 3 is a part of the bandage from FIG. 2 in an enlarged view
  • Fig. 5 shows a third embodiment of a press roll with base body segments
  • FIG. 6 shows a basic body segment from FIG. 5 in an enlarged representation.
  • Fig. 1 shows a press roll 1, which is provided with a press roll of the same construction for use in a roll press for press compacting or for crushing highly abrasive substances.
  • the press roll 1 consists essentially of a cylindrical roll base body 2 on which bearing journals 3 arranged coaxially are provided on both sides.
  • the press roll 1 has a powder-metallurgical wear layer 4 which is arranged on the base body 2 and is produced by hot isostatic pressing.
  • the wear layer consists of zones 5, of a highly wear-resistant material and a wear-resistant composite material filling the spaces 6 of the zones 5. The wear behavior of the zones 5 and the spaces 6 is matched to the property of the abrasive material to be processed.
  • the zones 5 and the spaces 6 have different wear behavior, which results in a surface profile of the press rolls 1 during operation of the roll press.
  • the zones 5 are formed by hard bodies 7 (see FIG. 3), which are produced by hot isostatic pressing.
  • the wear resistance of such hard bodies 7 is determined by the process of hot isostatic pressing and the material composition of the powder metallurgical substance.
  • the hard bodies 7 extend to the circumference of the roller base body 2.
  • the spaces 6 are, as already mentioned, filled with a composite material, the wear properties of which are also determined by a hot isostatic pressing process and by the powder-metallurgical material composition of the composite material.
  • the composite and the hard bodies 7 are fastened together on the base body 2 by a hot isostatic pressing process.
  • the powder-metallurgical wear layer 4 accordingly has a wear behavior which is adapted to the properties of the material to be processed.
  • highly wear-resistant powder-metallurgical materials which can also contain ceramic components, for example, are preferably used as the starting product for the production of the wear layer
  • the carbide part of the hard body material and the space material can be up to 65%
  • the combination of relatively tough roller body 2 with a very wear-resistant powder-metallurgical wear layer 4, which consists of zones 5 and spaces 6 with different wear properties, results in a relatively high wear resistance, in which operating conditions prevailing during, for example, briquetting, compacting and comminution, such a press roll 1 for use in a roll press according to the invention withstands even high pressure loads that act on the powder metallurgical wear layer 4 with simultaneous sliding stress along the roller surface.
  • the press rolls 1 are particularly well suited for press compaction or comminution of highly abrasive substances, such as, for example, glass powder, slag or iron or nonferrous metal ores.
  • the area of the highly wear-resistant zones 5 usually takes up approximately 60 to 90% of the total area of the active wear layer 4.
  • the size of the area of a wear-resistant zone 5 is usually 1 to 20 cm 2 . This creates a correspondingly desired profile in later operation.
  • a press roll 1 is shown, on the outer circumference of the roller base body 2, a circumferentially closed bandage 8 is arranged, which is attached to the roller base body 2 in a form-fitting or frictional manner.
  • the wear layer 4 is applied to the outer surface of the bandage 8. Because the bandage 8 serves as a carrier medium for the wear layer 4, the wear layer can be applied more easily to the roller base body 2.
  • the shape of the hard body 7 can, however, be arbitrary and can be selected in accordance with the conditions of use.
  • FIG. 4 A second variant of a bandage 8 is shown in FIG. 4, in which the wear layer is arranged between the circumferential webs 9 which laterally delimit the work area A.
  • the webs 9 extend radially outward to the roller base body 2 and have a height which corresponds approximately to the thickness of the wear layer 4. Due to the webs 9, the wear layer 4 is completely bordered on the side, as a result of which the sides can break out due to excessive pressure loading in the edge region.
  • FIG. 5 shows a third variant of a press roll for use in a roll press of the present invention, the roll base body 2 of which has an essentially cylindrical receiving area 10, on the circumference of which a plurality of base body segments 11 carrying the wear layer 4 on the outside are detachably arranged.
  • the base body segments 11 are positively placed on the receiving area 10 of the roller base body 2.
  • the base body segments 11 form a closed ring around the receiving area 10.
  • the segments 11 are connected to one another by means of a displacement and tongue and groove connections (see FIG. 6), so that a closed roller surface is formed on the outside.
  • the wear layer 4 can then be arranged on the outside of the segments 11 according to one of the variants of FIGS. 3 and 4.
  • the process for producing the wear layer 4 is characterized in that a highly wear-resistant material is first applied to the roller base body 2, so that essentially flat, evenly distributed zones 5 are formed. The spaces 6 of the flat zones 5 are then filled with a wear-resistant composite material. The zone material and the interspace material are subsequently attached to the base body 2 by a hot isostatic pressing process.
  • a hot isostatic pressing process There are now two process variants of how the hard bodies 7 forming the zones 5 can be produced by a hot isostatic pressing process.
  • the hard body 7 is produced from the highly wear-resistant material by hot isostatic pressing before it is applied to the basic roller body 2.
  • the platelet-shaped hard bodies 7 produced in this way can be applied to the roller base body 2 in any desired arrangement and in any desired shape, and the spaces 6 can then be filled with a wear-resistant composite material.
  • the composite material in the spaces 6 is then compressed accordingly and the entire wear layer 4 is attached to the roller base body 2.
  • the hard bodies 7 can be produced from the highly wear-resistant material by the hot isostatic pressing process for attaching the zone material.
  • a mold can be provided into which powder-metallurgical materials selected according to the desired composition can be filled. The mold then positions the corresponding zone material and interspace material on the base part.
  • the hard bodies 7 are simultaneously produced, the composite material is compressed in the spaces 6, and the entire wear layer 4 is attached to the base part.
  • the hot isostatic pressing process can be controlled so that the wear resistance of the hard body 7 and the wear resistance of the composite material filling the gaps 6 differ only slightly from one another.
  • the slightly less wear-resistant material range offers only slight differences in wear resistance the other material area has sufficient hold on the roller base body 2.
  • the wear resistance of the hard body 7 can be higher or lower, depending on the desired profiling caused by wear, than the wear resistance of the intermediate material. Which variant you choose depends on the desired profiling in later operation.
  • the wear resistance can be set very easily by setting the respective hard phase content in the hard body material and in the composite material accordingly.
  • different wear layers 4 which are correspondingly adapted to the materials to be processed, can be applied to the base part, in particular in the second process variant, as quickly as possible and without costly retrofitting of the machines.
  • a wear layer 4 By attaching such a wear layer 4 to a tough base part, a combination is achieved which is particularly insensitive to impact and pressure, in particular when processing highly abrasive substances such as e.g. Glass powder, slag or iron and nonferrous metal ores.
  • a powder-metallurgical wear layer 4 with different wear zones has a long service life, although in addition to the large pressure load, the surface is also subjected to sliding stress. This supports the dimensional stability of the molds on the roll surface to a positive degree. Furthermore, the present invention offers the advantage that the "wear layer system" can be used in all applications, such as briquetting, compacting and shredding. As a result, the application range of the roller press according to the invention is considerably expanded while the service life is increased.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Powder Metallurgy (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

L'invention concerne une presse à rouleaux, servant notamment au broyage de substances extrêmement abrasives, qui comprend au moins deux rouleaux presseurs comportant chacun une couche résistant à l'usure appliquée sur un corps de base. Cette couche résistant à l'usure présente des zones sensiblement planes réalisées dans un matériau très résistant à l'usure, les espaces situés entre les zones très résistantes à l'usure étant remplis d'un matériau présente une résistance à l'usure différente. De plus, le matériau qui remplit les espaces situés entre les zones planes est un matériau composite frittable et les zones très résistantes à l'usure sont formées de corps durs réalisés par compression isostatique à température élevée. Le matériau qui remplit les espaces situés entre les zones et le matériau qui constitue lesdites zones résistantes à l'usure sont fixés au corps de base par compression isostatique à température élevée. La résistance à l'usure du matériau composite est légèrement supérieure ou inférieure à celle des corps durs, conformément au profilage souhaité auquel l'usure donne lieu. L'invention concerne par ailleurs un procédé de production d'une couche de résistance à l'usure de ce type.
EP94925371A 1993-07-20 1994-07-20 Presses a rouleaux, notamment pour broyer des substances fortement abrasives Expired - Lifetime EP0659108B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9422077U DE9422077U1 (de) 1993-07-20 1994-07-20 Walzenpresse, insbesondere zum Zerkleinern von stark abrasiven Stoffen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4324344 1993-07-20
DE4324344 1993-07-20
PCT/EP1994/002394 WO1995003126A1 (fr) 1993-07-20 1994-07-20 Presses a rouleaux, notamment pour broyer des substances fortement abrasives

Publications (2)

Publication Number Publication Date
EP0659108A1 true EP0659108A1 (fr) 1995-06-28
EP0659108B1 EP0659108B1 (fr) 1998-10-07

Family

ID=6493278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94925371A Expired - Lifetime EP0659108B1 (fr) 1993-07-20 1994-07-20 Presses a rouleaux, notamment pour broyer des substances fortement abrasives

Country Status (6)

Country Link
US (2) US5755033A (fr)
EP (1) EP0659108B1 (fr)
JP (1) JPH08501731A (fr)
AU (1) AU7531894A (fr)
DE (1) DE59407047D1 (fr)
WO (1) WO1995003126A1 (fr)

Cited By (1)

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EP1077087A1 (fr) * 1999-08-14 2001-02-21 KHD Humboldt-Wedag AG Rouleau broyeur et procédé de fabrication correspondente

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US6086003A (en) 2000-07-11
JPH08501731A (ja) 1996-02-27
AU7531894A (en) 1995-02-20
DE59407047D1 (de) 1998-11-12
EP0659108B1 (fr) 1998-10-07
US5755033A (en) 1998-05-26
WO1995003126A1 (fr) 1995-02-02

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