NL8403322A - IMPROVEMENT OF FATIGUE STRENGTH OF RAILS. - Google Patents

IMPROVEMENT OF FATIGUE STRENGTH OF RAILS. Download PDF

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Publication number
NL8403322A
NL8403322A NL8403322A NL8403322A NL8403322A NL 8403322 A NL8403322 A NL 8403322A NL 8403322 A NL8403322 A NL 8403322A NL 8403322 A NL8403322 A NL 8403322A NL 8403322 A NL8403322 A NL 8403322A
Authority
NL
Netherlands
Prior art keywords
fatigue strength
rail
rails
stress
high temperature
Prior art date
Application number
NL8403322A
Other languages
Dutch (nl)
Original Assignee
Ir C Esveld Dr
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 Ir C Esveld Dr filed Critical Ir C Esveld Dr
Priority to NL8403322A priority Critical patent/NL8403322A/en
Priority to DE19853529379 priority patent/DE3529379A1/en
Publication of NL8403322A publication Critical patent/NL8403322A/en

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Classifications

    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • 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
    • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
    • C21D9/06—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails with diminished tendency to become wavy

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Description

Verbetering vermceiingssierkte van railsImproving the multiplication of rails

Da uitvinding heeft betrekking on ssn werkwijze j-jg yar_ moeiingasterkte van rails te varhogan door koud vervormen.The invention relates to the method of working on the strength of rails to be varhogan by cold-forming.

uat koud varvormen op zich is aan bskands techniek dia al'=._ maan gebruikt wordt om rails ts richten. Tijdens dit zogenoemds 5 rollsn-richten ontstaan sigensoanningen die aan nadelige invio=d 33 da sterkte en taaiheidseigenschaooen van de rail hebben. Da=r^m Jordan er in ranaalde gevallen technieken toagaoast om daza aicen-soanningan ta neutraliseren, waarvan ds bekendstsn zijn scannings-arm gloeien en axiaal rekken.Cold shaping in itself is a matter of bskands technique slide al '= ._ moon is used to align rails ts. During this so-called 5-roll alignment, sig- nance strains are created which have an adverse invi dition strength and toughness properties of the rail. In Jordan, there are also techniques to neutralize daza aicen-soanningan ta in rancid cases, of which the best known are annealing scanning arms and stretching axially.

10 Hst doel van da uitvinding is om via het (rollen}-richtcroces zodanig georiantaerde aigansoanningen te creëren, dat daze de varmoeiingssterkta verhogen. Dit voorscarinen geschiedt door de rail in vertikale zin via een continu verlopend proces elastisch te deformeren in de richting van de door het railverkeer uit ta oefenen 15 zwaartekrachtsbelasting. Dit principe ligt eveneens ten grondslag aande in octrooiaanvraag nr. 34G2S90 beschreven werkwijze om de vermoeiingsstarkta van raillassen te verbeteren. De voor ds las toegeoaste locale vervorming rondom de las vindt voor de rail op continue wijze plaats, waarbij dezelfde voorsoanmaat ter grootte 20 van ongeveer 10 mm cp een basis van 1.20 m kan worden toegepast. Analoog aan het locale voorspanprincipe valt met het continue voorspanproces eveneens een verhoging van de vermoeiinqssterkte te bereiken in de orde van enkele tientallen procenten, □aar koud vervormen in zijdelingse richting een sterk nega-25 tieve invloed blijkt ts hebben co de vermoeiingssterkts in vartikale richting, diant het zijdelings richten zodanig te geschieden, dat hiarcij gaen noamansuaardige residuals scanningan ontstaan. In vertikala zin moet de rail spanningsvrij zodanig gekromd zijn, dat daze oc aen basis van 1.20 m ongeveer 10 mm omhoog staat, alvorens 30 het voorsoannen door koud vervormen kan plaatsvinden. Aan daza voorwaarden kan worden voldaan door de rail bij een voldoend hoge temperatuur (boven SOO^C), zoals direct na het walsoroces het geval is, eerst zijdelings ts richten en vervolgens de gewenste vertikala kromming (bol) te geven met aen constante positieve qijlmaat.The aim of the invention is to create, via the (rolling} straightening process), oriented air loads in such a way that they increase the fatigue strength. the rail traffic exerting a gravitational load 15. This principle is also the basis of the method described in patent application No. 34G2S90 to improve the fatigue strength of rail welds. the same prestressing size of about 10 mm cp a base of 1.20 m can be used Analogous to the local prestressing principle, the continuous prestressing process also achieves an increase in fatigue strength of the order of several tens of percent, lateral direction appears to have a strong negative influence the fatigue strengths in the vertical direction, such as the lateral alignment, must be done in such a way that high-quality residuals scanningan are created. In a vertical sense, the rail must be curved stress-free in such a way that its base of 1.20 m is raised about 10 mm before the pre-sunning by cold-forming can take place. These conditions can be met by first orienting the rail at a sufficiently high temperature (above SOO ^ C), as is the case immediately after the rolling process, and then giving the desired vertical curvature (sphere) with a constant positive arrow size. .

35 Vanwege de symmetrie van het railcrofiel zal de rail tijdens het 8403322 - 2 - natuurlijke afkoelproces zijdelings niet scheeftrekken.Due to the symmetry of the rail profile, the rail will not skew laterally during the 8403322 - 2 - natural cooling process.

Nadat de rail is afgekoeld kan deze via een continu (rollen)-richtproces door koud vervormen in vertikale richting worden rechtgebogen, waarbij automatisch da beoogde voorspanning ontstaat.After the rail has cooled, it can be straightened in a vertical direction through cold (deformation) through a continuous (rolling) straightening process, whereby the intended pre-tension is automatically created.

84033228403322

Claims (3)

1. 'Jerkwijze tot het voorspannen van rails met het kenmerk, dat door een continu koud vervormingsoroces in de richting van de dominante gebruiksbelasting, dat uil zeggen de vertikale trein-bslasting in de richting van de zwaartekracht, de vermoeiingssterkte 5 met enkele tientallen procenten valt te verhogen.1. A method of prestressing rails, characterized in that due to a continuous cold deformation process in the direction of the dominant utilization load, that is to say the vertical train load in the direction of gravity, the fatigue strength 5 falls by a few tens of percent. increase. 2. Jerkwijzs volgens conclusie 1 met het kenmerk, dat om de voorsoanning te kunnen aanbrengen de rail met een uniforme kromminc (constante straal), overeenkomend met de voorsoanmaat bol dient te staan, c.q. ta worden gezet, zonder dat daarbij noemenswaardige jjj. 10 residuele spanningen worden geïntroduceerd. Dit'voorkrommen dient derhalve plaats te vinden bij een voldoend hoge temperatuur.2. Jerking method according to claim 1, characterized in that in order to be able to apply the pre-stress, the rail must be convex, with a uniform curvature (constant radius) corresponding to the pre-stress, without any significant yyyy. 10 residual stresses are introduced. This pre-curving should therefore take place at a sufficiently high temperature. 3. Jsrkwijze volgens conclusie 1 met als kenmerk, dat het horizontaal richten van de rail eveneens bij een voldoend hoge temperatuur dient te geschieden om het introduceren van eigen- 15 spanningen te voorkomen; koud vervormen in zijdelingse richting leidt tot ββπ drastische verlaging van de vermoeiingssterkte in vertikale richting, /*" verftka.lt’ = >0 33223. Method according to claim 1, characterized in that the horizontal alignment of the rail should also take place at a sufficiently high temperature in order to prevent the introduction of self-voltages; cold deformation in the lateral direction drastically decreases the fatigue strength in the vertical direction, / * "verftka.lt" => 0 3322
NL8403322A 1984-11-02 1984-11-02 IMPROVEMENT OF FATIGUE STRENGTH OF RAILS. NL8403322A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL8403322A NL8403322A (en) 1984-11-02 1984-11-02 IMPROVEMENT OF FATIGUE STRENGTH OF RAILS.
DE19853529379 DE3529379A1 (en) 1984-11-02 1985-08-16 Process for increasing the fatigue strength of rails

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8403322 1984-11-02
NL8403322A NL8403322A (en) 1984-11-02 1984-11-02 IMPROVEMENT OF FATIGUE STRENGTH OF RAILS.

Publications (1)

Publication Number Publication Date
NL8403322A true NL8403322A (en) 1986-06-02

Family

ID=19844693

Family Applications (1)

Application Number Title Priority Date Filing Date
NL8403322A NL8403322A (en) 1984-11-02 1984-11-02 IMPROVEMENT OF FATIGUE STRENGTH OF RAILS.

Country Status (2)

Country Link
DE (1) DE3529379A1 (en)
NL (1) NL8403322A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0904859A1 (en) * 1997-09-26 1999-03-31 British Steel Plc Method for the development of beneficial residual stresses in rails or beams

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521883B1 (en) * 1982-02-19 1985-08-30 Sacilor METHOD FOR DRESSING A RAILWAY RAIL AND DRESSE RAILWAY RAIL

Also Published As

Publication number Publication date
DE3529379C2 (en) 1987-05-27
DE3529379A1 (en) 1986-07-10

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