• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for producing a wheel tire made of metal for a rail wheel and is characterized in that the wheel tire is cast, which leads to a reduction of the weight of the rail wheel.
    公开号:AT516736A4
    申请号:T50121/2015
    申请日:2015-02-17
    公开日:2016-08-15
    发明作者:Johannes Hirtenlechner；Franz-Josef Weber；La Prida Caballero Ruben De
    申请人:Siemens Ag Österreich；
    IPC主号:
    专利说明:

    description
    Wheel tire for a rail wheel Technical field
    The invention relates to a method for producing a wheel tire made of metal for a rail wheel, ie for a wheel of a rail vehicle, as well as a wheel tire and a rail wheel. The finished rail wheel thus consists of a wheel body and the tire, both parts are made separately from each other and then joined together to form the rail.
    Relevant rail wheels are characterized by the fact that the wheel tire has a flange.
    State of the art
    The manufacturer of wheel sets for rail vehicles strives that the wheelsets have as little weight as possible, so the wheels and tires should be as light as possible, but still meet the necessary technical characteristics, such as minimum wear and high strength. Weight can be reduced by optimizing the shape of the rail wheels and / or by using lighter materials.
    Basically, it is known, for example from DE 203 06 253 Ul, to produce a solid wheel for wheelsets of rail vehicles made of ausferritischem cast iron with nodular iron (Austempered Ductile Iron, ADI), which is lighter than cast steel or steel forgings. Steel has a density of 7850 kg / m3, while non-ferritic ductile iron (ADI) or spheroidal graphite cast iron (GJS) has a density of only 7100 kg / m3.
    Lighter materials, such as the elimination of rolled or forged steel, but often at the expense of the desired high strength of the rail wheel.
    Object of the invention
    It is therefore an object of the invention to overcome the disadvantages of the prior art and to provide a wheel tire which is designed in view of the strength and low wear of the rail wheel.
    Presentation of the invention
    This object is achieved by a method having the features of claim 1, after which the wheel tire is cast.
    Cast materials usually have the advantage of having a lower specific gravity than forged materials. Due to the composition of the alloying constituents as well as the process control, in particular temperature control, nevertheless favorable properties of the wheel tire can be achieved in terms of strength and low wear.
    In addition, the associated wheel body can optionally also be made of a cast material or manufactured differently, for example conventionally forged. Another method of manufacturing the wheel body has the advantage that the wheel body can then have properties that the cast tire can not offer, or so any disadvantages of the cast tire can be compensated.
    An embodiment of the invention provides that the wheel tire is made of cast iron. Cast iron has a lower density than steel at about 7200 kg / m3 and therefore requires at least a weight saving.
    Further weight savings can be achieved if the wheel tire is made from nodular cast iron.
    The tire is preferably heat treated after casting to obtain the desired properties.
    In particular, the wheel tire may be made of Ausferritic ductile iron (ADI),
    So-called ausferritic ductile iron is referred to in English as the Austempered Ductile Iron (ADI), the abbreviation ADI also being used in German. ADI is an austenitic-ferritic ductile iron, while the mechanical properties of ADI are described in the European standard EN 1564, for example. ADI is a low-warpage isothermally tempered cast iron with nodular graphite. It is characterized by a very favorable combination of strength and elongation as well as high resistance to change and favorable wear behavior.
    The basis for ADI is cast iron with nodular graphite. In order to achieve isothermal conversion without pearlite or bainite formation, the melts destined for ADI are typically alloyed with small amounts of copper, molybdenum, manganese and nickel. Due to the necessary macro- and micro-homogeneity, high quality requirements are placed on the ADI castings.
    The usually custom machined workpieces are placed in an oven under protective atmosphere on the
    Austenitizing temperature of 850-950 ° C heated. The holding time is determined by the wall thickness and the chemical composition of the castings. After complete austenitization, the casting is quickly transferred to the quench bath and cooled (quenched) to the desired isothermal transformation temperature. As a quenching medium, a salt bath is often used. The transformation temperature is between 220 and 450 ° C. The conversion time is several hours. Too little holding leads to metastable retained austenite, too long holding for conversion to (real) bainite (ferrite with integrated carbide precipitation). Both are unfavorable for the typical ADI properties.
    The temperature of the isothermal transformation affects the resulting structure and thereby the mechanical properties of the castings. The lower the temperature, the higher the resulting hardness and strength of the material (or the lower the retained austenite content).
    The wheel tire can also be made from other grades of ferritic or pearlitic ductile iron cast iron, as well as from cast steel, whereby one selects alloys that have a particularly high wear resistance.
    The casting of the wheel tire allows a reduction in manufacturing costs because it requires less energy than, say, forging. With appropriate selection of the casting material, even the wear characteristics can be improved compared to forged steel and the acoustic properties of the tire can be improved by reduced tread roughness and / or by the internal damping of the casting material, especially when using ADI.
    In addition, molding can produce tire molds that are more favorable in strength than forged tires.
    In the case of the selected cast materials, care must be taken to ensure that those required for railway wheels
    Material properties are met. As a rule, a hardness of at least 270 HB, a tensile strength of at least 800 MPa and an elongation at break of at least 10% are required.
    If a wheel body is combined with a wheel tire according to the invention, the following materials would be favorable for the wheel body: cast aluminum, because of the low weight; Gray cast iron or - better - nodular cast iron (spheroidal graphite cast iron), because of the low material costs, nodular cast iron also because of the good internal damping; Cast Steel, ADI.
    The wheel tire according to the invention is particularly suitable for so-called light rail applications, such as for vehicles up to max. 12.5 tons, because of the low masses and speeds. In light rail applications, multi-piece wheels are common because of the acoustic characteristics.
    权利要求:
    Claims (18)
    [1]
    claims
    1. A method for producing a wheel tire made of metal for a rail wheel, characterized in that the wheel tire is cast.
    [2]
    2. The method according to claim 1, characterized in that the wheel tire is made of cast iron.
    [3]
    3. The method according to claim 2, characterized in that the wheel rim is made of cast iron with nodular graphite.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the wheel tire is heat treated after casting.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the wheel rim is made of ausferritischem cast iron with nodular graphite.
    [6]
    6. The method according to any one of claims 1 to 3, characterized in that the wheel tire is made of ferritic or pearlitic cast iron with nodular graphite.
    [7]
    7. The method according to claim 1, characterized in that the wheel tire is made of cast steel.
    [8]
    8. wheel tire made of metal for a rail wheel, characterized in that the wheel tire consists of a cast material.
    [9]
    9. tire according to claim 8, characterized in that the wheel tire is made of cast iron.
    [10]
    10. Wheel tire according to claim 9, characterized in that the wheel tire consists of ausferritischem cast iron with nodular graphite.
    [11]
    11. Wheel tire according to claim 9, characterized in that the wheel tire consists of ferritic or pearlitic cast iron with nodular graphite.
    [12]
    12. Wheel tire according to claim 8, characterized in that the wheel tire consists of cast steel.
    [13]
    13. Rail wheel with a wheel tire according to one of claims 8 to 12 and with a wheel body made of cast aluminum, gray cast iron, cast iron with nodular graphite, ADI or cast steel. New claims
    [1]
    1. wheel of cast iron material for a rail wheel, characterized in that the wheel tire made of cast iron with nodular graphite.
    [2]
    2. tire according to claim 1, characterized in that the wheel tire made of ausferritischem cast iron with nodular graphite.
    [3]
    3. tire according to claim 1, characterized in that the wheel tire made of ferritic or pearlitic cast iron with nodular graphite.
    [4]
    4. A method for producing a wheel tire according to any one of claims 1 to 3, characterized in that the wheel tire is heat treated after casting.
    [5]
    5. rail wheel with a tire according to one of claims 1 to 3, characterized in that the wheel body made of cast aluminum, gray cast iron, cast iron with nodular graphite, ADI or cast steel.
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    同族专利:
    公开号 | 公开日
    AT516736B1|2016-08-15|
    WO2016131701A1|2016-08-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2979A|1843-02-24|creed |
    US3037A|1843-04-10|Manner of constrttcting cast-iron wheels for locomotive steam-engines |
    US509409A|1893-11-28|Robert|
    DE1118472B|1958-05-21|1961-11-30|Kurt Dies Dr Ing|Use of quenched and tempered light metal cast alloys as a material for rail vehicle wheels with a shrunk-on steel wheel rim|CN112725685A|2020-12-10|2021-04-30|山东卢斯得机械股份有限公司|Brake component material based on steel wires in waste tires, brake component prepared from brake component material and preparation method of brake component|CA499958A|1954-02-16|Greenberg Leon|Railway or other trackline wheel and method of making the same|
    CN102560228B|2012-02-16|2013-12-11|扬州华铁铁路配件有限公司|Method for producing wheel made of austempered ductile iron material|
    CN103952617A|2014-05-14|2014-07-30|扬州大学|Novel Austempered ductile iron train wheel material alloy and melting technique thereof|
    法律状态:
    2020-10-15| MM01| Lapse because of not paying annual fees|Effective date: 20200217 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50121/2015A|AT516736B1|2015-02-17|2015-02-17|Wheel tire for a rail wheel|ATA50121/2015A| AT516736B1|2015-02-17|2015-02-17|Wheel tire for a rail wheel|
    PCT/EP2016/052905| WO2016131701A1|2015-02-17|2016-02-11|Tire for a rail wheel|
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