EP2445637A1 - Cylindre résistant à l'usure - Google Patents

Cylindre résistant à l'usure

Info

Publication number
EP2445637A1
EP2445637A1 EP10734318A EP10734318A EP2445637A1 EP 2445637 A1 EP2445637 A1 EP 2445637A1 EP 10734318 A EP10734318 A EP 10734318A EP 10734318 A EP10734318 A EP 10734318A EP 2445637 A1 EP2445637 A1 EP 2445637A1
Authority
EP
European Patent Office
Prior art keywords
roller
wear
flexible band
resistant
layer
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.)
Withdrawn
Application number
EP10734318A
Other languages
German (de)
English (en)
Inventor
David Dam Olsen
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.)
FLSmidth AS
Original Assignee
FLSmidth AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FLSmidth AS filed Critical FLSmidth AS
Publication of EP2445637A1 publication Critical patent/EP2445637A1/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/004—Shape or construction of rollers or balls
    • B02C15/005—Rollers or balls of composite construction

Definitions

  • the present invention relates to a method for producing a wear-resistant roller for processing very abrasive materials, such as crude ore, by which method a layer of wear-resistant material is provided on at least a part of the surface of the roller where high resistance to wear is needed.
  • the wear-resistant roller may for example be used in a high-pressure roller press, in a vertical roller mill or in similar equipment for processing of particulate material.
  • a wear-resistant roller of the aforementioned kind is known from US6086003. In this
  • a wear-resistant layer consisting of two different powder metallurgical steels is applied on the surface of a roller by means of diffusion welding.
  • the advantage of using powder metallurgical steels is that a surface with a very high content of hard phases and a high toughness can be achieved due to a fine microstructure and small well-distributed carbides.
  • the powder metallurgical technology furthermore allows for a composition of hard phases which is difficult or impossible to achieve by other techniques. Hexagonal tiles are preformed using a first material and placed on the surface of a roller covering the largest area of the surface and a second material is placed between the tiles.
  • the second material has a lower content of carbides and therefore a higher wear rate but also a higher toughness, i.e. high resistance to crack propagation.
  • This difference in wear and mechanical properties of the two materials will ensure that an autogenous wear protection is obtained and that fractures in the surface due to tramp metal etc. are avoided.
  • the diffusion welding technique used is Hot Isostatic Pressing (HIP) where the metallurgical powder is consolidated to 100% density by applying a pressure above 1000 bar and a temperature above 1000 0 C.
  • the high pressure of the HIP process is a significant disadvantage as the equipment for the process must be designed to withstand such a high pressure. At present the diameter of the roller is limited to 1500 mm in diameter due to the equipment for the HIP process.
  • the European patent 0516952B 1 describes a roller press in which the rollers comprise a plurality of cylindrical pins embedded in the crushing surface.
  • the cylindrical pins which are made of wear-resistant material, are inserted in drilled holes in the crushing surface of the roller and secured by means of a shrink fit connection or a similar arrangement. A part of the pins protrudes from the surface of the roller. Given that the pins and holes must fit each other exactly in order to withstand the high loads occurring during operation they must be manufactured with a relatively high degree of precision and since the entire circumference of the roller is covered with pins it is a very time-consuming process to manufacture such a roller. As a consequence hereof, the manufacture of such rollers involves significant costs.
  • the bands are described as being flexible since they can be shaped and easily cut prior to sintering. The flexibility is provided since the bands are saturated with a mixture of metal powder which is not influenced by neither handling nor pre-cutting the band before sintering.
  • the powder mixture consists of braze material and wear-resistant particles.
  • the wear-resistant particles may be cemented tungsten carbides.
  • the flexible band is provided with a number of holes and/ or grooves prior being formed and fitted to the curvature of the surface of the roller.
  • the holes or grooves may be provided to the flexible band by means of a rolling technique.
  • the holes or grooves in the flexible band may have any conceivable shapes as long as the texture of the layer of sintered wear-resistant material offers suitable protection for the roller and/or establishes an autogenous wear protection.
  • the holes may have a polygonal or oval shape and the grooves may for example have a zig-zag shape in the axial direction of the roller or around the circumference of the roller.
  • the area of the holes or grooves in the surface of the finished wear-resistant roller exceed the area in the surface without holes or grooves.
  • the holes or grooves may go through the whole layer of flexible band or just extend a small distance into the band.
  • the flexible band is provided with through-going cylindrical holes since these will effectively establish the autogenous wear protection and they are easy and fast to cut in the flexible band.
  • more layers of flexible bands are bonded to the roller.
  • the layers are bonded on top of each other and the thickness of the layers may vary. Multiple layers will increase the lifetime of the roller. It is preferred that only the outermost layer is provided with holes or grooves. In this way the roller material onto which the layers are provided will not be subjected to wear until the innermost layer of flexible band is worn down.
  • the roller should preferably be provided with two layers of flexible band where the inner layer has a greater ductility than the outer layer, with the outer layer having a higher hardness than the inner layer. In this way the harder outer layer provides good protection against wear and the inner layer, which not is subject to severe wear, is very resistant to crack propagation.
  • a buffer layer prior to sintering is provided between the flexible band and the roller. In this way it is possible to achieve an even stronger bond between the roller and the flexible band when the wear-resistant layer is sintered to the roller. In addition to this a greater variety of materials for both the roller and the flexible band will be available since to some degree the buffer layer may compensate for the properties of the two materials.
  • the flexible band is divided into more sections which are fixed to the roller in either circumferential or axial direction of the roller.
  • the roller is a hollow cylinder divided into a number of annular sections on each of which the flexible band is formed, fitted and sintered for subsequently being shrink- fitted to a roller body.
  • the annular sections can be produced in specialized workshops and be transported to another location, e.g. the site where the rollers are in operation, for being shrink- fitted to the roller body. It may also be possible to change a worn-out or damaged annular section on site if it is shrink- fitted to the roller body.
  • FIG. Ia, Fig. Ib and Fig. Ic show embodiments of rollers provided with flexible bands according to the invention.
  • FIG. 2a and Fig. 2b show a cross-sectional view of the outer part of a wear-resistant roller.
  • FIG. 3 shows an embodiment of a wear-resistant roller surface.
  • FIG. 4 shows flexible bands according to the invention fixed to the surface of a number of roller tyres.
  • Fig. Ia shows a wear-resistant roller for processing abrasive materials.
  • the roller 1 is provided with a flexible band 2 being at least partially saturated with wear-resistant particles.
  • the flexible band 2 is formed and fitted, without any need for heating, to the curvature of the surface of the roller 1 and subsequently bonded to the roller 1 by means of a sintering process.
  • Prior sintering holes 5 are provided in the flexible band 2 in order to establish an autogenous wear protection during the operation of the wear- resistant roller.
  • Fig. Ib shows an embodiment of a wear-resistant roller where the flexible band 2 is divided into multiple sections and fixed to the roller 1 in the circumferential direction of the roller surface.
  • Fig. Ic also shows a wear-resistant roller where the flexible band is divided into multiple sections but in this embodiment the sections of flexible band 2 are much smaller and fixed in the axial direction of the roller surface.
  • Fig. 2a shows a cross-sectional view of the outer part of a wear-resistant roller.
  • An inner layer of flexible band 3 and an outer layer of flexible band 2 are fixed to the roller 1.
  • a buffer layer 4 is provided between the roller 1 and the inner layer of flexible band 3. In this way it is possible to achieve an even stronger bond between the roller 1 and the inner layer of flexible band 3 when the wear-resistant layers of flexible band 2,3 are sintered to the roller 1.
  • the layers of flexible band 2,3 are bonded on top of each other and the thickness of the layers may vary.
  • the outer layer of flexible band 2 is provided with holes 5 before sintering.
  • the flexible band 2 Prior to sintering it is very easy to provide the flexible band 2 with holes 5, which means it is a fast and effective way of achieving a desired texture on the surface of the wear-resistant roller.
  • the holes 5 will be filled with fine particles of crushed material. The fine material will become compacted in the holes whereby an autogenous wear protection is established.
  • the inner layer of flexible band 3 has a greater ductility than the outer layer of flexible band 2 and the outer layer of flexible band 2 has a higher hardness than the inner layer of flexible band 3.
  • Fig. 2b also shows a cross-sectional view of the outer part of a wear- resistant roller.
  • only one layer of flexible band 2 is bonded to the roller 1.
  • the holes 5 only extend a small distance into the layer of flexible band 2. In this way the roller will not be subject to wear before the flexible band 2 is worn down. This might be a preferred embodiment if only one layer of flexible band 2 is used.
  • Fig. 3 shows an embodiment of a section of two flexible bands 2,3 on top of each other wherein a combination of holes 5 and grooves 6 are cut in the outer layer of the flexible band 2.
  • the flexible bands 2,3 are shown prior being formed and fitted to the curvature of the surface of the roller and prior to being bonded to the roller 1 by means of a sintering process.
  • the holes 5 and the grooves 6, which have a zig-zag shape, extend through the whole layer of the flexible band 2. In other embodiments the holes 5 and/or grooves 6 may just extend a small distance into the flexible band 2.
  • Fig. 4 shows an embodiment where the roller is a hollow cylinder divided into a number of annular sections 7 on each of which the flexible band 2 is formed, fitted and sintered whereafter the annular sections 7 are shrink- fitted to a roller body.
  • the annular sections 7 can be produced in specialized workshops and be transported to another location for being shrink-fitted to a roller body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

L'invention se rapporte à un procédé de production d'un cylindre résistant à l'usure destiné à traiter des matériaux abrasifs, tels que du minerai brut. Par ce procédé, une couche de matériau résistant à l'usure est disposée sur au moins une partie de la surface du cylindre (1) où une résistance à l'usure élevée est nécessaire. Le procédé se caractérise en ce que ladite couche de matériau résistant à l'usure comprend une bande flexible (2) au moins partiellement saturée en particules résistant à l'usure, ladite bande flexible (2), sans nécessiter de chauffage, étant formée et ajustée sur la courbure de la surface du cylindre (1) pour une liaison ultérieure au cylindre (1) au moyen d'un processus de frittage. De cette façon, il sera relativement facile et rapide de fabriquer un cylindre résistant à l'usure et il sera possible de fabriquer des cylindres ayant un diamètre très important, sans être limité par un équipement qui doit pouvoir résister à des pressions élevées.
EP10734318A 2009-06-26 2010-06-24 Cylindre résistant à l'usure Withdrawn EP2445637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200900799 2009-06-26
PCT/IB2010/052901 WO2010150225A1 (fr) 2009-06-26 2010-06-24 Cylindre résistant à l'usure

Publications (1)

Publication Number Publication Date
EP2445637A1 true EP2445637A1 (fr) 2012-05-02

Family

ID=42801802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10734318A Withdrawn EP2445637A1 (fr) 2009-06-26 2010-06-24 Cylindre résistant à l'usure

Country Status (2)

Country Link
EP (1) EP2445637A1 (fr)
WO (1) WO2010150225A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102302965B (zh) * 2011-07-22 2014-05-07 宁波富仕达电力工程有限责任公司 磨煤机磨辊堆焊结构
JP2015528857A (ja) * 2012-07-31 2015-10-01 エフ・エル・スミス・エー・エス 耐摩耗性ローラー部材を製造するための方法
CN107243383A (zh) * 2017-08-14 2017-10-13 合肥明英富海生物科技有限公司 一种饲料添加剂加工粉碎机的挤压辊的制造工艺
DE102018113440A1 (de) * 2018-06-06 2019-12-12 Maschinenfabrik Köppern Gmbh & Co. Kg Walzenpresse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE428473A (fr) *
FR1411152A (fr) * 1964-08-04 1965-09-17 Socam Sa Appareil à cylindres pour la réduction de grosseur de produits, notamment de produits de minoterie
DE4132474A1 (de) 1991-05-28 1992-12-03 Kloeckner Humboldt Deutz Ag Verschleissfeste mahlwalze fuer die verwendung in walzenmaschinen, insbesondere in hochdruckwalzenpressen
WO1995003126A1 (fr) 1993-07-20 1995-02-02 Maschinenfabrik Köppern Gmbh & Co. Kg Presses a rouleaux, notamment pour broyer des substances fortement abrasives
DE19515568A1 (de) * 1995-04-27 1996-10-31 Krupp Polysius Ag Mahlelement und Verfahren zu dessen Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010150225A1 *

Also Published As

Publication number Publication date
WO2010150225A1 (fr) 2010-12-29

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