WO2010059286A1 - Crampon pour sabot de chenille résistant à l’abrasion - Google Patents

Crampon pour sabot de chenille résistant à l’abrasion Download PDF

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Publication number
WO2010059286A1
WO2010059286A1 PCT/US2009/057629 US2009057629W WO2010059286A1 WO 2010059286 A1 WO2010059286 A1 WO 2010059286A1 US 2009057629 W US2009057629 W US 2009057629W WO 2010059286 A1 WO2010059286 A1 WO 2010059286A1
Authority
WO
WIPO (PCT)
Prior art keywords
grouser
track
distal edge
covering
tungsten carbide
Prior art date
Application number
PCT/US2009/057629
Other languages
English (en)
Inventor
Keith D. Fischer
Mark S. Diekevers
Curt Douglas Afdahl
Kevin Lee Steiner
Christopher Barnes
Original Assignee
Caterpillar Inc.
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 Caterpillar Inc. filed Critical Caterpillar Inc.
Priority to AU2009318053A priority Critical patent/AU2009318053B2/en
Priority to CA2743574A priority patent/CA2743574C/fr
Publication of WO2010059286A1 publication Critical patent/WO2010059286A1/fr
Priority to ZA2011/03407A priority patent/ZA201103407B/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/26—Ground engaging parts or elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/26—Ground engaging parts or elements
    • B62D55/28—Ground engaging parts or elements detachable
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process

Definitions

  • This patent disclosure relates generally to track-type vehicles and, more particularly, to a track shoe with at least one grouser incorporating a capping surface of enhanced abrasion resistance across the distal edge and adjacent lateral surfaces of the grouser.
  • the tracks may be covered by shoes incorporating outwardly projecting grousers which engage the ground and provide enhanced traction during use.
  • traction decreases. This decrease in traction gives rise to enhanced slippage when the machine is moving heavy loads.
  • an operator may be required to reduce the average mass per load being transported. Over time, this correlates to a reduction in overall productivity.
  • the overall productivity of a dozer having worn grousers may be reduced by about 30% relative to a dozer with new grousers. That is, in a given time, the dozer with worn grousers moves about
  • This reference advocates milling or machining a groove along the tip of the grouser and brazing an insert or a strip of a composite hard wear resistant alloy in the slot. It is also known to apply a wear resistant hardfacing treatment of material such as steel with embedded tungsten carbide particles across the upper face of the grouser.
  • the track shoe includes a base plate and a grouser projecting away from the base plate.
  • the grouser includes a distal edge surface facing away from the base plate.
  • the grouser further includes first and second lateral faces adjacent the distal edge surface.
  • the track shoe further includes a capping surface structure of substantially horseshoe shaped cross-sectional profile.
  • the capping surface structure includes a first covering segment disposed in covering relation to at least a portion of the first lateral face adjacent to the distal edge surface, a second covering segment disposed in covering relation to at least a portion of the second lateral face adjacent to the distal edge surface, and a third covering segment disposed at least partially across the distal edge surface.
  • the capping surface structure is formed from a material characterized by enhanced wear resistance relative to the substrate material of the grouser underlying the capping surface structure.
  • this disclosure describes a method of enhancing wear resistance of a track shoe for a track-type vehicle.
  • the track shoe includes a base plate and a grouser projecting away from the base plate.
  • the method includes applying a capping surface structure in overlying relation to a distal portion of the grouser.
  • a first covering segment is applied in covering relation to at least a portion of a first lateral face adjacent to a distal edge surface of the grouser and a second covering segment is applied in covering relation to at least a portion of a second lateral face adjacent to the distal edge surface.
  • a third covering segment is applied at least partially across the distal edge surface between the first covering segment and the second covering segment to define a substantially horseshoe shaped cross section.
  • Segments of the capping surface structure are formed from a material characterized by enhanced wear resistance relative to portions of the grouser substrate material face structure.
  • Figure 1 is a diagrammatic side view of an exemplary track-type machine.
  • Figure 2 is a diagrammatic side view of an exemplary track shoe for use on a track-type machine.
  • Figure 3 is a diagrammatic view illustrating an exemplary hardfacing process for application of an abrasion resistant surface covering to a surface of a grouser or other work piece.
  • Figure 4 is a diagrammatic view illustrating an exemplary pattern for application of a hardfacing treatment to a surface of a grouser or other work piece.
  • Figures 5-7 are sequential diagrammatic views illustrating an exemplary sequence for building a capping surface structure about a tip portion of a grouser.
  • Figure 8 is a diagrammatic perspective view illustrating track shoes on a machine with an applied capping surface structure of abrasion resistant material in covering relation to tip portions of the grousers.
  • Figure 9 is a diagrammatic view similar to Figure 7 illustrating an alternative configuration for a capping surface structure of abrasion resistant material about a tip portion of a grouser.
  • Figure 10 is a diagrammatic view of a cross-section of an applied abrasion resistant surface covering overlying a grouser surface. -A-
  • Figure 11 is a micrograph showing a section view of an applied abrasion resistant surface covering incorporating particles within a first size distribution.
  • Figure 12 is a micrograph showing a portion of the section view of Figure 11 at enhanced magnification.
  • Figure 13 is a micrograph showing a section view of an applied abrasion resistant surface covering incorporating particles within a second size distribution at the same magnification as Figure 11.
  • Figure 14 is a micrograph showing a portion of the section view of Figure 13 at the same magnification as Figure 12.
  • Figure 1 illustrates an exemplary machine 10 that performs some type of operation associated with an industry such as mining, construction, farming, transportation, or any other industry known in the art.
  • the machine 10 includes a track 12 with an arrangement of track shoes 14 at the exterior of the track 12.
  • the track shoes 14 are adapted to engage the ground during operation.
  • the machine 10 may be an earth moving machine such as a dozer excavator, loader, or the like.
  • the machine 10 may be any other track-type vehicle as may be desired.
  • an exemplary track shoe 14 may include a base plate 16 and a grouser 18 projecting away from the base plate 16.
  • the grouser 18 normally extends across the base plate 16 so as to be oriented in substantially transverse relation to the travel direction of the track 12 during operation. As the track 12 moves, the grouser 18 digs into the ground and provides enhanced traction.
  • the grouser 18 is characterized by a generally pyramidal cross-section including a grouser base 20 in proximal relation to the base plate 16 and a distal edge surface 22 def ⁇ ning a relatively narrow width plateau in elevated relation to the grouser base.
  • a first lateral face 24 and a second lateral face 26 extend in diverging, angled relation away from opposing perimeter edges the distal edge surface 22 towards the grouser base 20.
  • the intersection between the distal edge surface 22 and the first lateral face 24 defines a first corner transition zone 28.
  • the intersection between the distal edge surface 22 and the second lateral face 26 defines a second corner transition zone 30.
  • the first corner transition zone 28 and/or the second corner transition zone 30 may be slightly rounded as illustrated or may incorporate sharp corners if desired.
  • the track shoe 14 may be formed by a rolling operation applied to an ingot such that the base plate 16 and the grouser 18 are integrally formed from a common ductile material such as a plain machineable carbon steel or the like.
  • ductile materials may aid in formation of the track shoe 14, such materials may also be susceptible to wear during use in an abrasive environment.
  • a capping surface structure 32 ( Figure 7) defining an abrasion resistant surface covering is disposed in covering relation to the distal edge surface 22 and adjacent portions of the first lateral face 24 and the second lateral face 26.
  • the capping surface structure 32 includes a first covering segment 34 extending along the first lateral face 24, a second covering segment 36 extending along the second lateral face 26 and a third covering segment 38 oriented in substantially bridging relation across the distal edge surface 22 between the first covering segment 34 and the second covering segment 36.
  • one or more segments of the capping surface structure 32 may be formed using hardfacing techniques wherein a heating device such as a torch, welding head or the like is used to form a liquid pool of molten metal across a surface of the grouser 18 and particles of a wear- resistant material such as cemented tungsten carbide or the like are deposited into the formed pool to yield a composite alloy of enhanced wear resistance when the pool resolidifies.
  • a heating device such as a torch, welding head or the like is used to form a liquid pool of molten metal across a surface of the grouser 18 and particles of a wear- resistant material such as cemented tungsten carbide or the like are deposited into the formed pool to yield a composite alloy of enhanced wear resistance when the pool resolidifies.
  • Figure 3 illustrates one exemplary practice for application of an abrasion resistant surface covering across a surface of the grouser 18 using a hardfacing treatment.
  • Figure 3 illustrates an exemplary technique for application of the first covering segment 34 across portions of the first lateral face 24
  • similar application techniques may likewise be used for application of the second covering segment 36 and/or the third covering segment 38 as may be desired.
  • the surface being treated may be positioned in generally opposing relation to a welding head 50 including an electrode 52 of consumable mild steel wire or the like. As an arc is developed between the welding head 50 and the opposing surface, the electrode 52 is liquefied and forms a liquid pool 53.
  • a portion of the underlying substrate material may also undergo melting to a relatively shallow depth, thereby providing additional liquid to the liquid pool 53.
  • the liquid pool 53 may be developed progressively by moving the welding head 50 relative to the surface being treated indicated by the directional arrow. Of course, it is also contemplated that the welding head 50 may remain stationary with relative movement of the grouser 18 if desired.
  • the use of the welding head 50 with an electrode 52 of consumable character may be beneficial in many environments of use, it is contemplated that virtually any localized heating technique may be used to form the liquid pool 53 across the surface being treated.
  • the electrode 52 may be of non-consumable character such that the weld pool is formed exclusively from the material forming the surface of the grouser 18.
  • a torch or other heating device may be used in place of the welding head 50 either with or without a consumable member. Accordingly, the formation of the liquid pool 53 is in no way dependent upon the use of any particular equipment or process.
  • particles 56 of wear resistant material are delivered to the liquid pool 53 for development of a wear resistant composite alloy upon resolidification of the liquid pool 53.
  • one suitable material for the particles 56 is cemented tungsten carbide bonded together with cobalt.
  • One potentially useful source of suitable particles 56 is cemented tungsten carbide recovered from ground drill bits used in machining operations. However, other materials may likewise be utilized if desired.
  • the particles 56 may be formed from other materials including, without limitation, cast tungsten carbide, macrocrystalline tungsten carbide, as well as carbides of other metals including molybdenum, chromium, vanadium, titanium, tantalum, beryllium, columbium, and blends thereof characterized by enhanced wear resistance relative to the substrate material forming the grouser 18.
  • the resultant abrasion resistant surface covering includes the particles 56 of the wear-resistant material within a matrix of steel or other base metal that previously formed the liquid pool 53.
  • the liquid pool 53 is disposed at a relatively localized position and remains in a liquid state for a limited period of time before resolidification takes place.
  • one exemplary particle delivery practice may utilize a drop tube 58 of substantially hollow construction which moves along a path generally behind the welding head 50.
  • the particles 56 are typically applied at a level of about of about 0.1 to about 0.3 grams per square centimeter of the treatment zone, although higher or lower levels may be used if desired.
  • the treatment zone width 60 provided by a pass of the welding head 50 and the drop tube 58 may be controlled by the pattern of movement of the welding head 50.
  • the welding head 50 may move in a substantially straight line with the drop tube 58 following directly behind.
  • Such a straight line pattern may typically be used to yield a treatment zone width 60 of about 15 millimeters or less.
  • the welding head may be moved in a generally zigzag pattern 62 such as is shown in Figure 4 with the drop tube 58 trailing in a generally straight line 63 along the middle of the zigzag pattern 62.
  • the zigzag pattern 62 provides a wider liquid pool 53 for acceptance of the particles 56 which may be deposited at the midpoint of the formed pool.
  • the welding head 50 may make multiple passes in adjacent relation to one another to substantially cover any portion of the surface as may be desired.
  • the liquid pool 53 During the hardfacing procedure, surface tension characteristics cause the liquid pool 53 to form a generally convex raised bead across the surface of the treatment zone.
  • the introduction of the particles 56 may tend to enhance the volume of this raised bead.
  • This raised bead structure is generally retained upon resolidification of the abrasion resistant surface covering.
  • the final solidified abrasion resistant surface covering may be raised about 4 millimeters relative to the plane of the treated surface and extend to a depth of about 2 millimeters below the plane of the treated surface due to melting of the base material. However, these levels may be increased or decreased as desired.
  • a first phase of forming the capping surface structure 32 along the tip of the grouser 18 may involve applying the first covering segment 34 along the first lateral face 24 in adjacent relation to the distal edge surface 22 as illustrated in Figure 3. As shown, the first covering segment projects outwardly from the surface of the first lateral face 24 and to a position at least partially covering the first corner transition zone 28 ( Figure 2). As shown in
  • a second phase of forming the capping surface structure 32 may involve applying the second covering segment 36 along the second lateral face 26 in adjacent relation to the distal edge surface 22.
  • the second covering segment 36 projects outwardly from the surface of the second lateral face 26 and to a position at least partially covering the second corner transition zone 30 ( Figure 2).
  • a third phase of forming the capping surface structure 32 may involve applying the third covering segment 38 along the distal edge surface 22 in bridging relation to the previously formed first covering segment 34 and second covering segment 36.
  • the first covering segment 34, the second covering segment 36 and the third covering segment 38 thus cooperatively define the capping surface structure 32 of generally horseshoe shaped cross-sectional configuration.
  • the capping surface structure 32 may be substantially continuous along the length of the grouser 18. However, the capping surface structure 32 may likewise be discontinuous along the length of the grouser 18 if desired.
  • first covering segment 34 and the second covering segment 36 extend an effective distance downwardly towards the grouser base 20 to provide coverage to portions of the first lateral face 24 and the second lateral face 26 engaging rocks and other abrasive structures at or near the surface of the ground during use.
  • extending the first covering segment 34 and the second covering segment 36 a distance of about 6 millimeters to about 30 millimeters downwardly from the distal edge surface may be useful in many applications.
  • Extending the first covering segment 34 and the second covering segment 36 a distance of about 6 millimeters to about 15 millimeters downwardly from the distal edge surface may be particularly desirable in many applications, although greater or lesser distances may be used if desired.
  • first covering segment 34 and the second covering segment 36 typically may be formed by using straight line movement of the welding head 50 in substantially adjacent, parallel relation to the first corner transition zone 28 and to the second corner transition zone 30 respectively.
  • the third covering segment 38 typically may be formed using a single pass of the welding head 50 following a zigzag pattern 62 as shown in Figure 4. However, multiple passes may be used on any surface if additional coverage is desired.
  • crevices 64 may extend along the intersections between the covering segments at positions generally above the corner transitions.
  • Figure 9 illustrates an alternative configuration wherein elements corresponding to those previously described are designated by like reference numerals with a prime.
  • the first covering segment 34' is of multi-sectioned construction including a first corner cover section 70' disposed generally over the first corner transition zone 28' and a cooperating first lateral face cover section 72'.
  • Each of the first corner cover section 70' and the first lateral face cover section 72' may be formed by a discrete hardfacing pass or other suitable technique.
  • the second covering segment 36' is of multi-sectioned construction including a second corner cover section 74' disposed generally over the second corner transition zone 30' and a cooperating second lateral face cover section 76'.
  • Each of the second corner cover section 74' and the second lateral face cover section 76' may be formed by a discrete hardfacing pass or other suitable technique.
  • the first covering segment 34' and the second covering segment 36' cooperate with the third covering segment 38' to define a substantially horseshoe shaped cross-sectional profile. It is contemplated that multi-sectioned configurations may be beneficial in providing enhanced protection to corners or other defined regions. Accordingly, while various covering segments of unitary construction may be useful for many applications, the use of multiple sections in adjacent relation to one another may likewise be utilized if desired. Thus, it is contemplated that any of the covering segments may be made up of single or multiple sections that cooperatively define a generally horseshoe shaped cross-section.
  • Benefits associated with introducing wear resistant material in covering relation to the distal edge and lateral surfaces of a grouser may be understood through reference to the following non- limiting working examples 1- 8.
  • selected surfaces of a grouser on a track shoe for a CATERPILLAR® DlO bulldozer were treated with an abrasion resistant material applied by hardfacing techniques to provide either a horseshoe pattern covering substantially as shown and described in relation to Figure 7 or, alternatively, a covering across the distal edge only.
  • the abrasion resistant material utilized cemented tungsten carbide particles with a size range of +14 - 24 mesh applied in a hardfacing procedure at a drop rate of 250 grams per minute using a weld head with a wire speed of 350 inches per minute, a travel speed of 10.8 inches per minute and a voltage of 29 volts.
  • the track shoe was then used on one track of the bulldozer in a defined environment until the grouser was worn down to a height of about 1.5 inches thereby corresponding to a level typically requiring track shoe replacement.
  • the hours worked before replacement was required were then compared to the replacement hours for untreated track shoes used on the other track of the same machine.
  • the abrasion resistant material was applied in a pattern corresponding to the configuration illustrated in Figure 7 with such material substantially covering the distal edge surface and extending a distance of approximately 30 millimeters downwardly from the distal edge surface along the adjacent lateral faces towards the track shoe base to form a substantially horseshoe profile.
  • the same abrasion resistant material was applied by the same hardfacing procedure at the same thickness in complete covering relation to the distal edge surface but without coverage along adjacent lateral surfaces. Such coverage exclusively across the distal edge surface is consistent with current industry practice.
  • test procedures as outlined above were carried out on a machine operated at a location in Arizona, USA, characterized by igneous rock ground cover.
  • test procedures as outlined above were carried out on a machine operated at a location in Nevada, USA, characterized by igneous rock ground cover.
  • test procedures as outlined above were carried out on a machine operated at a location in Kentucky, USA, characterized by sandstone ground cover.
  • test procedures as outlined above were carried out on a machine operated at a location in West Virginia, USA, characterized by sandstone ground cover.
  • the grousers provided with abrasion resistant material across the distal edge and adjacent surfaces displayed increased life substantially beyond untreated grousers and well beyond grousers having equivalent abrasion resistant material applied across the distal edge only.
  • the overall productivity of a dozer having worn grousers may be reduced by about 30% relative to a dozer with new grousers. That is, in a given time, the dozer with worn grousers moves about 30% less material between two defined locations.
  • prolonging the useful life of the most distal portion of the grousers correlates directly to improved productivity of the machine.
  • packing factor refers to the ratio of the volume of the composite alloy occupied by the applied particles in the solidified state relative to the total volume of the abrasion resistant surface covering .
  • an abrasion resistant surface covering in which the applied particles occupy 50% of the total volume will have a packing factor of 0.50.
  • one or more cross-sections may be cut through the capping surface structure 32 and the underlying portion of the grouser 18 as shown diagrammatically in Figure 10. As shown, the particles 56 are concentrated in a band extending away from the grouser 18.
  • an outer zone 65 having very few particles may be disposed at the extreme outer surface. This outer zone 65 is formed substantially from the matrix material generated by the melting electrode 52. As will be appreciated, when subjected to an abrasive environment, the outer zone 65 may tend to exhibit initial rapid wear until a zone having an enhanced concentration of particles 56 becomes exposed.
  • Figures 11-14 present micrographs of applied capping surface structures showing representative orientations corresponding substantially to Figure 10.
  • the boxes in Figures 11 and 13 extend generally from the underlying work piece to the lower edge of the outer zone, thereby illustrating the concentration of particles in that region.
  • the cross sections may be etched and polished to display the particles 56 within the matrix.
  • a measurement zone 66 may then be defined within the etched and polished surface.
  • the ratio of the surface area occupied by the particles 56 within the measurement zone 66 to the total area of the measurement zone 66 defines an area occupancy ratio which may be used as a measurement of the packing factor.
  • evaluating the surface area occupied by the particles 56 in a standardized measurement zone extending from the surface of the grouser 18 to a position about 3 millimeters above the surface of the grouser 18 may be useful in evaluating the packing factor in portions of the capping surface structure 32 adjacent to the surface of the grouser 18 having high concentrations of particles 56.
  • a single sample may be used, enhanced accuracy may be achieved by evaluating multiple samples and averaging the area occupancy ratios in those samples.
  • the particles 56 of wear resistant material may be of fractal dimensionality characterized by an effective diameter in the range of about +14 -120 mesh. That is, the particles will be small enough to pass through a U.S. Standard 14 mesh screen and will be blocked from passing through a U.S. Standard 120 mesh screen. Within this broad range, it may be desirable for significant percentages of particles to occupy sub-ranges to provide a diverse population of particle sizes. Such a diverse particle size distribution permits smaller particles to cooperatively fill spaces between the larger particles to enhance the overall packing factor .
  • Table I one exemplary size distribution for the applied particles 56 is set forth in Table I below. Table I
  • a size distribution for applied particles of wear resistant material which may be particularly desirable for some applications is set forth in Table II below.
  • the exemplary size distributions may be adjusted to substantially reduce or eliminate particles in the +14 - 22 mesh range thereby shifting the distribution towards smaller effective diameters corresponding to higher mesh numbers.
  • the presence of such larger particles may provide additional stability in highly abrasive environments such as may be present if the grouser 18 engages quarts, igneous rock, slag or other similar media of significant abrasive character.
  • minor percentage of particles having an effective diameter greater than 14 mesh or smaller than 120 mesh may be applied if desired. However, in some applications it may be useful for about 95% or more by weight of the particles to be within the +14 - 120 mesh range.
  • Figures 11 and 12 are cross-sectional micrographs of an abrasion resistant surface covering of tungsten carbide particles within a steel matrix utilizing cemented tungsten carbide particles with a size range of +14 -120 mesh.
  • the abrasion resistant material utilized cemented tungsten carbide particles with a size range of +14 -120 mesh.
  • Approximately 64% by weight of the applied particle mass was in the size range +14 - 22 mesh.
  • Approximately 16% by weight of the applied particle mass was in the size range +22 - 33 mesh.
  • Approximately 16% by weight of the applied particle mass was in the size range +33 - 60 mesh.
  • Approximately 4% by weight of the applied particle mass was in the size range +60 - 120 mesh.
  • the particles were applied in a hardfacing procedure at a drop rate of 350 grams per minute using a weld head with a wire speed of 350 inches per minute, a travel speed of 10.8 inches per minute and a voltage of 29volts. Based on relative area occupancy, the packing factor of the tungsten carbide particles was in the range of 0.6 to 0.7.
  • Example 9 The procedures as outlined in Example 9 were repeated in all respects except that the abrasion resistant material utilized cemented tungsten carbide particles with a size range of +14 - 24 mesh.
  • the resultant abrasion resistant surface covering of tungsten carbide particles within a steel matrix is shown in the micrographs at Figures 12 and 13. Based on relative area occupancy, the packing factor of the tungsten carbide particles was in the range of 0.4 to 0.5.
  • a track shoe including a grouser with a capping surface structure consistent with the present disclosure may find application in virtually any track- type vehicle using tracks to engage the ground during movement.
  • track-type vehicles may include crawler- type bulldozers, rippers, pipelayers, loaders, excavators and the like.
  • the track shoe defines a ground-engaging surface at the exterior of a track.
  • the capping surface structure provides enhanced abrasion resistance across the distal edge and adjacent lateral surfaces of the grouser thereby prolonging useful life and overall machine productivity.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
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Abstract

L'invention concerne un sabot de chenille pour un véhicule du type à chenilles. Le sabot de chenille comprend une plaque de base et un crampon faisant saillie à distance de la plaque de base. Une structure de surface de recouvrement à coupe sensiblement en forme de fer à cheval est disposée en travers d'une partie distale du crampon. La structure de surface de recouvrement recouvre des parties d'une surface de bord distale et des surfaces latérales adjacentes. La structure de surface de recouvrement est formée à partir d'un matériau caractérisé par une résistance améliorée à l'usure par rapport aux parties du crampon se trouvant sous la structure de surface de recouvrement.
PCT/US2009/057629 2008-11-21 2009-09-21 Crampon pour sabot de chenille résistant à l’abrasion WO2010059286A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2009318053A AU2009318053B2 (en) 2008-11-21 2009-09-21 Abrasion resistant track shoe grouser
CA2743574A CA2743574C (fr) 2008-11-21 2009-09-21 Crampon pour sabot de chenille resistant a l'abrasion
ZA2011/03407A ZA201103407B (en) 2008-11-21 2011-05-10 Abrasion resistant track shoe grouser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11698908P 2008-11-21 2008-11-21
US61/116,989 2008-11-21

Publications (1)

Publication Number Publication Date
WO2010059286A1 true WO2010059286A1 (fr) 2010-05-27

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PCT/US2009/057629 WO2010059286A1 (fr) 2008-11-21 2009-09-21 Crampon pour sabot de chenille résistant à l’abrasion

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US (2) US8424980B2 (fr)
AU (1) AU2009318053B2 (fr)
CA (1) CA2743574C (fr)
WO (1) WO2010059286A1 (fr)
ZA (1) ZA201103407B (fr)

Cited By (1)

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US20100141027A1 (en) 2010-06-10
CA2743574A1 (fr) 2010-05-27
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US20130221739A1 (en) 2013-08-29
AU2009318053A1 (en) 2010-05-27
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US8678522B2 (en) 2014-03-25
US8424980B2 (en) 2013-04-23

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