EP0971825A1 - Procede d'amelioration des proprietes des roues pour voies ferroviaires et roue correspondante - Google Patents

Procede d'amelioration des proprietes des roues pour voies ferroviaires et roue correspondante

Info

Publication number
EP0971825A1
EP0971825A1 EP98914206A EP98914206A EP0971825A1 EP 0971825 A1 EP0971825 A1 EP 0971825A1 EP 98914206 A EP98914206 A EP 98914206A EP 98914206 A EP98914206 A EP 98914206A EP 0971825 A1 EP0971825 A1 EP 0971825A1
Authority
EP
European Patent Office
Prior art keywords
base material
surface layer
railway
wheel
completing
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Withdrawn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
EP98914206A
Other languages
German (de)
English (en)
Inventor
Johan Lennart Olofsson
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.)
Duroc AB
Original Assignee
Duroc AB
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 Duroc AB filed Critical Duroc AB
Publication of EP0971825A1 publication Critical patent/EP0971825A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B17/00—Wheels characterised by rail-engaging elements
    • B60B17/0006—Construction of wheel bodies, e.g. disc wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
    • B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Definitions

  • the present invention relates to a method for improving the properties of railway wheels.
  • the invention also relates to a railway wheel.
  • the object of the present invention is to provide a method which improves the properties of railway wheels regarding inter alia surface fatigue and when they are brought to high rolling speeds and heavy loads and when they are exposed to air and rain pollutions. This is arri- ved at according to the invention by providing the initially defined method with the characterizing steps primarily of subsequent claim 1.
  • fig. 1 is a perspective view of a part of a railway wheel from which base material portions which might crack or have cracked have been removed by turning;
  • fig. 2 is the same view of the railway wheel as in fig. 1, said wheel being completed with surface layers ;
  • fig. 3 is the same view of the railway wheel as in fig. 1, said wheel being completed with a surface layer having another location than in fig. 2;
  • fig. 4 is the same view of the railway wheel as in fig. 1, said wheel being completed with a surface layer having another location than in fig. 2 and 3;
  • fig. 5 is a section through the railway wheel of fig. 1 during application of a completing surface layer.
  • FIG. 1 A part of a railway wheel 1 which shall be completed with a surface layer is shown in the drawings.
  • the illustrated railway wheel 1 is made of a base material 2, e.g. steel, and is provided with a wheel tread surface 3 and a wheel flange 4.
  • reference numerals 5 and 6 refer to those portions of the tread surface 3 which are subjected to high stresses when the railway wheel 1 rolls on the rail.
  • Said portions 5, 6 may e.g. consist of such portions of the tread surface which have cracks or are expected to crack due to fatigue of the base material 2, e.g. if the railway wheel 1 is used on high-velocity trains.
  • a surface layer 7 and 8 of the base material 2 is removed within said portions 5 and 6.
  • the railway wheel 1 may e.g. for this purpose be placed in a rotary device (not shown) for rotation relative to a surface layer processing or machining device, e.g. a turning chisel (not shown).
  • a surface layer processing or machining device e.g. a turning chisel (not shown).
  • the railway wheel 1 can be placed in another rotary device (not shown) for rotation relative to an assembly 11.
  • This assembly 11 is adapted to subject the base material 2 at the recesses 9, 10 to heat radiation, preferably to high-energy radiation in the form of laser radiation 12, for melting said base material 2 in the bottom of the recesses 9, 10.
  • the assembly 11 is adapted, while said base material 2 is brought to melt, to simultaneously add to the melt 13 one or more additives 14, 15 of such type that when the melt 13 has cooled, completing surface layers 16, 17 are formed, having other properties than the base material 2.
  • This melting and addition of material is carried through such that the completing surface layers 16, 17 are formed of elongated strings 18 which are made by forming said melt 13 and letting it solidify.
  • the strings 18 can be located so close to each other that they partly overlap each other (as is shown in fig. 2 and 4) or be located spaced from each other such that the railway wheel 1 in the spaces 19 therebetween has an outer surface 20 of base material 2.
  • one completing surface layer 16 can be located on the wheel tread surface 3 close to inner portions of the railway wheel 1 and the other completing surface layer 17 close to the wheel flange 4.
  • the width A of the completing surface layer 16 can be chosen such that said width corresponds to about one third of the total width B of the tread surface 3
  • the width C of the completing surface layer 17 can be chosen such that this width is less than said width A.
  • the completing surface layers 16, 17 can be located at such distance from each other that a space 21 is defined therebetween having an outer surface 20 of base material 2 and this space 21 can be chosen to have a width D which is somewhat less than the width A of the completing surface layer 16.
  • the strings 18 can be located such that they extend around the railway wheel 1 (as is shown in fig. 2 or 3 ) or such that they run obliquely relative to the axis of the railway wheel 1 and define an angle 0C of 20 - 90° with said axis (the direction of which is marked with A in fig. 4) .
  • Additive or additives 14, 15 is/are added to the melt 13 such that the completing surface layer or layers 16, 17 provide for, inter alia, a) improved resistance to crack formation compared to the base material 2 and/or b) improved resistance to surface fatigue compared to the base material 2 and/or c) improved properties regarding the preservation of the circular shape of the wheel tread surface 3 compared to the base material 2 and/or d) improved resistance to corrosion in comparison with if the railway wheel 1 is made only of the base material 2.
  • Such an additive or additives 14, 15 can also be added to the melt 13 that the completing surface layers 16, 17 get electrically conducting properties for obtaining at least a certain electric contact between the railway wheel 1 and a rail in contact therewith, through said completing surface layers 16, 17 even if this electric contact is not as good as the electric contact obtainable with the base material 2.
  • the completing surface layers 16, 17 can be located so that the outer surfaces 20 of the base material 2 can get in contact with the rail for providing electric contact between the base material 2 and said rail . Furthermore, the completing surface layers 16, 17 can be located so that the outer surfaces 20 of the base material 2 on at least one of the railway wheels 1 on a railway- waggon will engage the rail when said waggon is driven thereon, so that there will always be electric contact between at least one of the railway wheels 1 and the rail.
  • the additive 14, 15 is chosen preferably also with regard to the type of base material 2 for the railway wheel 1 and/or the extent of improvement of said properties you desire. Thus, the additive 14, 15 can be a metal, a metal alloy or a metal mixture and/or at least a ceramic.
  • Said metallic material 14 can be e.g. iron, cobalt or nickel and said ceramics 15 can be e.g. tungsten, carbide, titanium carbide, vanadium, niobium carbide or tantalum carbide.
  • inventive method and inventive object is not limited to what is described above and shown in the drawings, but may vary within the scope of the following claims.
  • one or more completing surface layers 16, 17 can be provided on the wheel flange 4, that the railway wheel 1 can be provided with one or more completing surface layers 16, 17 on the wheel flange 4, that said recesses 9, 10 preferably can be filled with completing sur- face layers 16, 17 so that the outer surfaces 22 thereof, eventually after a smoothing surface treatment such as grinding, will be flush with the outer surfaces 20 of adjoining base material 2 and that the portions of the railway wheel 1 to be provided with completing surface layers 16, 17 are preheated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne pour voies ferroviaires et un procédé permettant d'améliorer les propriétés de ces roues (1). Selon ce procédé, des parties du matériau de base (2) de la roue (1) sont enlevées et remplacées par des couches extérieures de complément (16, 17) réalisées par formation d'une masse fondue sur lesdites parties du matériau de base (2) et ce, de préférence, par rayonnement laser. Un matériau d'apport, ajouté à cette masse fondue, confère aux couches extérieures de complément (16, 17) des propriétés supplémentaires par rapport aux propriétés inhérentes au matériau de base (2).
EP98914206A 1997-04-01 1998-03-30 Procede d'amelioration des proprietes des roues pour voies ferroviaires et roue correspondante Withdrawn EP0971825A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9701173 1997-04-01
SE9701173A SE511411C2 (sv) 1997-04-01 1997-04-01 Förfarande för att förbättra egenskaper på järnvägshjul och järnvägshjul
PCT/SE1998/000586 WO1998043834A1 (fr) 1997-04-01 1998-03-30 Procede d'amelioration des proprietes des roues pour voies ferroviaires et roue correspondante

Publications (1)

Publication Number Publication Date
EP0971825A1 true EP0971825A1 (fr) 2000-01-19

Family

ID=20406379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98914206A Withdrawn EP0971825A1 (fr) 1997-04-01 1998-03-30 Procede d'amelioration des proprietes des roues pour voies ferroviaires et roue correspondante

Country Status (6)

Country Link
EP (1) EP0971825A1 (fr)
JP (1) JP2001517177A (fr)
AU (1) AU6861398A (fr)
BR (1) BR9808634A (fr)
SE (1) SE511411C2 (fr)
WO (1) WO1998043834A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2786129B1 (fr) 1998-11-19 2000-12-29 Alstom Tech Roue de securite, procede de fabrication d'une telle roue et bogie equipe d'une telle roue
CA2872008C (fr) * 2012-04-30 2017-10-31 Craig MERCIER Procede et systeme pour rechaper une roue de vehicule ferroviaire
KR101470481B1 (ko) * 2013-05-03 2014-12-08 한국철도기술연구원 철도차량용 코팅 차륜
GB2553097A (en) * 2016-08-18 2018-02-28 Bae Systems Plc Additive layer manufacturing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2610157C2 (de) * 1976-03-11 1986-09-18 Elaugen GmbH Schweiß-und Schleiftechnik, 4300 Essen Schienenfahrzeugrad
SE422550B (sv) * 1978-01-10 1982-03-15 Asea Ab Hjul for relsgaende fordon
DE3509582C1 (de) * 1985-03-16 1986-02-20 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Metallrad, insbesondere Eisenbahnrad

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9843834A1 *

Also Published As

Publication number Publication date
JP2001517177A (ja) 2001-10-02
AU6861398A (en) 1998-10-22
SE511411C2 (sv) 1999-09-27
SE9701173L (sv) 1998-10-02
SE9701173D0 (sv) 1997-04-01
WO1998043834A1 (fr) 1998-10-08
BR9808634A (pt) 2000-05-16

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