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EP0620065A1 - Verfahren zur Herstellung von Kompositverschleissteilen und so hergestellte Verschleissteile - Google Patents

Verfahren zur Herstellung von Kompositverschleissteilen und so hergestellte Verschleissteile Download PDF

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Publication number
EP0620065A1
EP0620065A1 EP94200689A EP94200689A EP0620065A1 EP 0620065 A1 EP0620065 A1 EP 0620065A1 EP 94200689 A EP94200689 A EP 94200689A EP 94200689 A EP94200689 A EP 94200689A EP 0620065 A1 EP0620065 A1 EP 0620065A1
Authority
EP
European Patent Office
Prior art keywords
inserts
support
wear
mold
cores
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Withdrawn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
EP94200689A
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English (en)
French (fr)
Inventor
Norbert Guerard
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.)
Magotteaux International SA
Original Assignee
Magotteaux International SA
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 Magotteaux International SA filed Critical Magotteaux International SA
Publication of EP0620065A1 publication Critical patent/EP0620065A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal

Definitions

  • the present invention relates to a method of manufacturing a composite wear part, in particular a wear part for vertical or cylindrical grinders comprising inserts and a body according to which said body is cast around the inserts arranged in a mold. .
  • the invention also relates to wearing parts produced by the implementation of this method.
  • European patent application EP-0 476 496 describes a method in which longitudinal inserts, comprising at least one projecting radial rib, are arranged against each other on the circumference of a mold with axial symmetry. This way of operating ensures that the inserts are not displaced by the casting of the second metal.
  • this method can only be used for relatively large inserts in a mold with axial symmetry and a high insertion rate since the inserts must be in mutual contact.
  • the aim of the present invention is to propose a method for manufacturing composite wearing parts which makes it possible to maintain the inserts in their position during the casting of the second metal, without the inserts having to be in direct contact with the neighboring inserts.
  • the present invention provides a method of manufacturing a composite wearing part comprising inserts and a body in which the body is poured around the inserts in a mold and which is characterized in that said inserts are fixed on a temporary destructible support and that this support is used as the delimitation surface of the mold.
  • the support is a cylindrical envelope.
  • the inserts can be fixed to this support by mechanical means, such as screws, rivets or circlips, by adhesive means, such as high temperature ceramic glues, or by welding.
  • the support can be perforated at the places where the inserts will be placed.
  • the support for example made of sheet metal, can be coated with a refractory to allow it, during casting, to withstand the temperature of the cast metal at least until the inserts are caught in it.
  • the support can be removed, for example by machining, abrasion, fusion, etc., if the operating conditions of the part require it.
  • the support advantageously has a first surface which, in the mold, at least partially delimits the wear surface, and the inserts are fixed directly to this first mold surface.
  • the support consists of cores of parallelipiped shape with a length corresponding to the width of the wearing part. These cores are made of foundry sand hardened with a binder. Several inserts are fixed to each core by partial immersion before hardening of the sand.
  • insert-holder cores are then erected on edge and juxtaposed to form a peripheral belt in the mold.
  • the inserts are asymmetrically aligned on their cores, which allows, by erecting them alternately in one direction and in the other, to automatically realize the staggered configuration of the network of inserts.
  • the inserts can advantageously be subjected to a homogenization heat treatment and / or coated with a refractory before being fixed to the support.
  • the inserts can be of varied shape, for example: cylindrical, frustoconical, polygonal or can have the shape of a truncated pyramid. They may also include at least one re-entrant radial groove and / or at least one projecting radial rib so as to be well anchored in the body of the part by their particular geometric shape.
  • the inserts are advantageously made of a metal alloy having a high resistance to wear, for example, of chromium cast iron containing complex carbides of chromium (Cr), niobium (Nb), vanadium (V) and / or molybdenum (Mo).
  • the inserts can also be made of molten tungsten carbides and infiltrated by brazing based on nickel (Ni) or copper (Cu).
  • the body of the part for its part, is advantageously made of a metal alloy combining good mechanical properties with an average resistance to wear.
  • the average temperature of the inserts being lower than the average temperature of the material forming the body of the part during its solidification, the material forming the body contracts more than the inserts during cooling after casting of the body of the part. Of this way, the inserts are held in position by the contraction forces exerted by the body.
  • the mass ratio of the inserts / total mass of the part is advantageously between 5 and 40%.
  • the part may have a bore which may be either cylindrical or conical.
  • the face for laying on the bore can be flat so as to allow easier machining of the part and, in this case obviously, the shaft on which the segments will be mounted is polygonal.
  • the distribution of the inserts is regular and forms a network of which the mesh is a centered hexagon made up of equilateral elementary triangles.
  • the arrangement and the distance between the inserts can be chosen so that the structure formed by the ductile metal gives the assembly a high resistance to mechanical stresses.
  • Other distributions of the inserts are also possible, such as for example in the form of a network whose mesh is a square or a centered square. Tests have shown that, for hoops for mills, the diameter of the inserts is advantageously between 10 and 100 mm and that the optimal spacing between the inserts is between 2 and 40 mm.
  • the resistance to wear, the diameter of the inserts, the distribution of the inserts and the density of the inserts can be adapted to the local intensity of the abrasion to avoid irregular wear along the generator and thus eliminate costly operations of periodic adjustments or loss of grinding efficiency.
  • the arrangement of the inserts in the shredder frets is determined so that the different hardness of the metals promotes the appearance of a macro-roughness which reduces slippage between the material to be ground and the grinding surface to increase the throughput and reduce wear on the parts.
  • Such mills are, for example, used to grind ores, coal or clinker. They essentially consist of two juxtaposed cylindrical rollers 21, 22 which rotate in opposite directions. The material to be ground 23 is introduced through a feed channel (not shown). It is gripped between the two cylinders 21, 22 and ground under high pressure. The ground material 24 then falls on a conveyor belt which discharges it to a storage place for example.
  • the composite wear parts can also advantageously be used in a vertical roller mill as shown diagrammatically in FIG. 2.
  • Such shredders essentially consist of a rotary track 30 on which grinding rollers 32 move. material to be ground is introduced through a central feed channel 34 and falls on track 30 where it is crushed and ground between this track and the rollers 32. The ground material is captured, at the periphery of track 30, by a current ascending hot air and separated at the same time under the effect of gravity and a separator 36 according to the particle size.
  • the rollers 32 must have a frustoconical shape as shown in Figure 2 and be slightly inclined.
  • the grinding rollers are, in general, constituted by a frustoconical or cylindrical annular hoop, mounted on a hub. On the one hand, they must have sufficient resistance to wear caused by grinding and, at the same time, be able to be machined to be mounted on the hub.
  • the known hoops are generally cast in Ni-hard cast iron or in chromium cast iron and then machined with great precision before being mounted on the hub.
  • the wear of such a hoop is uniform over the circumference of the hoop.
  • wear is generally variable, along the same generator, the ends, especially the peripheral ends, wear out less quickly than the central part.
  • there is a gradual polishing of the work surface with the consequence of an increased risk of slippage between the hoop and the material to be ground.
  • the profile of the working surfaces changes and the backlash adjustment system no longer makes it possible to restore optimal grinding conditions.
  • the sliding between the material to be ground and the surface of the hoop accelerates wear and reduces the flow rate, especially if the material to be ground is wet.
  • FIGS. 3, 4 and 5 Examples of different modes of distribution of the inserts on a hoop or a grinding cylinder are represented in FIGS. 3, 4 and 5.
  • FIG. 3 we see a unitary mesh in the form of a centered hexagon whose elements are actually equilateral triangles.
  • the unit cells shown in Figures 4 and 5 have the shape of a centered square, respectively a square. It will be noted that, due to the fixing of the inserts, the difference between the latter can be significant, which makes it possible to give the assembly a high resistance to mechanical stresses. In any case, the configuration according to Figure 3 allows the achievement of the highest insertion rate.
  • Figures 6A, 7A and 8A show different forms of inserts.
  • the geometric shape of the inserts is important for the life of the hoop and for its mechanical stability.
  • the inserts shown comprise, in the three illustrated cases, two re-entrant peripheral radial grooves 16 which improve the anchoring of the inserts in the body of the part.
  • Figures 6B, 7B and 8B show three preferred cross-sectional shapes of the inserts: circular, square or hexagonal respectively.
  • the shape of the base surface of the inserts is important because it determines, with the diameter of the inserts and their spacing, the percentage of the wear surface formed by the material of the inserts, respectively by the material of the hoop body. ie the insertion rate.
  • Figure 9 shows an example of a particular distribution on the working surface of a hoop. Larger diameter 6 '' inserts are placed in the middle of the work surface while smaller diameter 6 'inserts are located at the peripheral ends.
  • This particular distribution of the inserts is advantageous because the wear of a hoop is, in general, not regular. Indeed, the wear of a hoop is circumferentially uniform. On the other hand, wear is generally variable the along the same generator. Indeed, the peripheral ends wear less quickly than the central part. It follows that the profile of the working surfaces changes and that ultimately, the backlash system no longer allows to work in optimal conditions. The frets must then be dismantled and rectified.
  • a grinding track such as that shown at 30 in FIG. 2 can also be produced with inserts.
  • Figures 10 and 11 illustrate a first embodiment of a method of casting a hoop 2 of a grinding roller consisting of a body 14 of annular cylindrical shape in a relatively ductile material in which are embedded the periphery of the inserts 6 according to FIG. 6A in an alloy with high wear resistance.
  • the inserts 6 are first fixed to the inner wall of a cylindrical support 4, for example made of sheet metal. In the example shown, this fixing is carried out using screws 8.
  • This support 4 is then placed with its lining of inserts 6 in a mold which is delimited internally by a cylindrical part to form a central cylindrical bore 12 defining the inner surface 10 of the hoop 2.
  • the metal can thus fill the entire volume 14 delimited internally by the mold and externally by the support 4.
  • the material forming the body contracts more during cooling. In this way, the inserts 6 are also maintained by the pressure stresses exerted by the material forming the body of the hoop 2 on the inserts 6.
  • the part shown in broken lines in FIG. 10 is obtained in which the support 4 remains attached to the inserts 6. Since casting does not allow smooth and finished surfaces to be produced, the part is preferably subjected to machining on a lathe until the hoop 2 shown in solid lines is obtained. This machining eliminates at the same time the temporary support 4.
  • Figures 12 to 16 illustrate a second embodiment of the method according to the present invention. Although suitable for the different configurations of Figures 3 to 5, this embodiment is particularly suitable for the staggered configuration according to Figure 3.
  • provisional assemblies are first produced by bringing together several inserts 6 using the cores 40 to form combs of the kind shown on Figures 12 and 13.
  • These cores 40 which are ingots of parallelipiped shape, are formed in what is called a core box. It is a tank of shape complementary to that of the cores 40, the bottom of which has cavities of shape complementary to that of the inserts 6.
  • the inserts 6 are placed in their respective cavities and the tank is filled with foundry sand and of binder to form the cores 40 which, by hardening thanks to the binder, retain the inserts 6.
  • each core carries three inserts.
  • the particularity of this embodiment is that, with a view to achieving a configuration according to FIG. 3, the three inserts 6 are arranged asymmetrically in their core 40, that is to say that the two outer inserts are located at different distances from the two ends of the nuclei.
  • annular mold For the casting of the cylinders, an annular mold is used which is delimited externally and internally by cylindrical surfaces 42 and 44.
  • the cores 40 are then erected edge: one next to the other along the outer wall taking care to take advantage of the asymmetrical arrangement of the inserts 6 in their cores 40 to place the cores 40 alternately in one direction and in the other so that the inserts 6 after their installation are presented according to the staggered configuration of FIG. 14.
  • the cores 40 can be bonded to each other and to the wall of the mold.
  • the cores 40 have, in section, as shown in FIG. 13, a slightly frustoconical shape so that, as shown in FIG. 15, the cores 40 can be juxtaposed without play and take place by the simple arch effect without the need for glue.
  • the disassembly and unhooking of the peripheral ring constituted by the cores is carried out in order to obtain a rough part from which protrude the parts of the inserts 6 which previously were coated by the pits.
  • These projecting parts are then removed by a usual cutting process such as for example with a disc, a flame, a band saw, etc.
  • the simplest way, however, is a shock break. This rupture can be facilitated and controlled by making in each insert, for example during their casting or by machining, a notch at the desired place of the rupture.
  • the remnants of the inserts thus detached can be reused for example for pouring other inserts.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Earth Drilling (AREA)
  • Crushing And Grinding (AREA)
EP94200689A 1993-04-14 1994-03-17 Verfahren zur Herstellung von Kompositverschleissteilen und so hergestellte Verschleissteile Withdrawn EP0620065A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU88246A LU88246A1 (fr) 1993-04-14 1993-04-14 Procédé de fabrication de pièces d'usure composite et pièces réalisées par ce procédé
LU88246 1993-04-14

Publications (1)

Publication Number Publication Date
EP0620065A1 true EP0620065A1 (de) 1994-10-19

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EP94200689A Withdrawn EP0620065A1 (de) 1993-04-14 1994-03-17 Verfahren zur Herstellung von Kompositverschleissteilen und so hergestellte Verschleissteile

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LU (1) LU88246A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19515568A1 (de) * 1995-04-27 1996-10-31 Krupp Polysius Ag Mahlelement und Verfahren zu dessen Herstellung
FR2777928A1 (fr) * 1998-04-22 1999-10-29 Lupato Antonio Er Srl Dispositif pour bouchardes rotatives longue duree
CN102350391A (zh) * 2011-09-07 2012-02-15 成都利君实业股份有限公司 硬质合金柱钉辊面
WO2012159894A3 (de) * 2011-05-25 2013-02-07 Thyssenkrupp Polysius Ag Mahlwalze sowie eine hochdruck-walzenmühle
WO2013083419A1 (de) * 2011-12-06 2013-06-13 Khd Humboldt Wedag Gmbh Mahlwalze mit in die oberfläche eingesetzten hartkörpern
WO2013189759A1 (de) * 2012-06-19 2013-12-27 Khd Humboldt Wedag Gmbh Profilierte bandage für eine rollenpresse
CN105413804A (zh) * 2015-12-03 2016-03-23 中钢集团安徽天源科技股份有限公司 一种高压辊磨机辊面结构及制作方法
WO2017091859A1 (en) * 2015-12-02 2017-06-08 Crushing And Mining Equipment Pty Ltd A wear element, a composite wear surface liner for a crusher or a chute, a method and system for casting wear liners for crushers and a retainer for use therewith

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1692725A (en) * 1926-02-09 1928-11-20 American Abrasive Metals Compa Manufacture of articles adapted to resist abrasion
US2155215A (en) * 1936-02-27 1939-04-18 Beament Thomas Geoffrey Method of producing composite wear-resisting bodies
DE2457449A1 (de) * 1974-12-05 1976-06-10 Wolfgang Gummelt Verbundgusstueck
EP0476496A1 (de) * 1990-09-20 1992-03-25 Magotteaux International Verfahren zur Herstellung eines bimetallischen Gussstückes und Verschleissteil nach diesem Verfahren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1692725A (en) * 1926-02-09 1928-11-20 American Abrasive Metals Compa Manufacture of articles adapted to resist abrasion
US2155215A (en) * 1936-02-27 1939-04-18 Beament Thomas Geoffrey Method of producing composite wear-resisting bodies
DE2457449A1 (de) * 1974-12-05 1976-06-10 Wolfgang Gummelt Verbundgusstueck
EP0476496A1 (de) * 1990-09-20 1992-03-25 Magotteaux International Verfahren zur Herstellung eines bimetallischen Gussstückes und Verschleissteil nach diesem Verfahren

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19515568A1 (de) * 1995-04-27 1996-10-31 Krupp Polysius Ag Mahlelement und Verfahren zu dessen Herstellung
FR2777928A1 (fr) * 1998-04-22 1999-10-29 Lupato Antonio Er Srl Dispositif pour bouchardes rotatives longue duree
ES2167144A1 (es) * 1998-04-22 2002-05-01 Lupato Antonio Er S R L Herramienta para rotoescodadora de duracion prolongada.
WO2012159894A3 (de) * 2011-05-25 2013-02-07 Thyssenkrupp Polysius Ag Mahlwalze sowie eine hochdruck-walzenmühle
CN102350391A (zh) * 2011-09-07 2012-02-15 成都利君实业股份有限公司 硬质合金柱钉辊面
WO2013083419A1 (de) * 2011-12-06 2013-06-13 Khd Humboldt Wedag Gmbh Mahlwalze mit in die oberfläche eingesetzten hartkörpern
DE102011120178C5 (de) * 2011-12-06 2016-04-14 Khd Humboldt Wedag Gmbh Mahlwalze mit in die Oberfläche eingesetzten Hartkörpern
WO2013189759A1 (de) * 2012-06-19 2013-12-27 Khd Humboldt Wedag Gmbh Profilierte bandage für eine rollenpresse
WO2017091859A1 (en) * 2015-12-02 2017-06-08 Crushing And Mining Equipment Pty Ltd A wear element, a composite wear surface liner for a crusher or a chute, a method and system for casting wear liners for crushers and a retainer for use therewith
CN105413804A (zh) * 2015-12-03 2016-03-23 中钢集团安徽天源科技股份有限公司 一种高压辊磨机辊面结构及制作方法

Also Published As

Publication number Publication date
LU88246A1 (fr) 1994-12-01

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