EP0199706A2 - Procédé et dispositif pour éviter le bosselage de rails dans la zone de transition entre l'extrémité et le profil de l'aiguille - Google Patents

Procédé et dispositif pour éviter le bosselage de rails dans la zone de transition entre l'extrémité et le profil de l'aiguille Download PDF

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Publication number
EP0199706A2
EP0199706A2 EP86890076A EP86890076A EP0199706A2 EP 0199706 A2 EP0199706 A2 EP 0199706A2 EP 86890076 A EP86890076 A EP 86890076A EP 86890076 A EP86890076 A EP 86890076A EP 0199706 A2 EP0199706 A2 EP 0199706A2
Authority
EP
European Patent Office
Prior art keywords
rail
tongue
heat treatment
temperature
burner
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.)
Granted
Application number
EP86890076A
Other languages
German (de)
English (en)
Other versions
EP0199706B1 (fr
EP0199706A3 (en
Inventor
Franz Dipl.-Ing. Rotter
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.)
Voestalpine Turnout Technology Zeltweg GmbH
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0199706A2 publication Critical patent/EP0199706A2/fr
Publication of EP0199706A3 publication Critical patent/EP0199706A3/de
Application granted granted Critical
Publication of EP0199706B1 publication Critical patent/EP0199706B1/fr
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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
    • 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

Definitions

  • the invention relates to a method for preventing the indentation of rails in the transition area between the tongue end and tongue profile, and to an apparatus for performing this method.
  • Bulging the tongue rail end onto the Vignol rail profile is usually done by hot forming in the die.
  • the heating to the forming temperature required for this takes place in special annealing furnaces, the rails being inserted into the furnace to a corresponding length.
  • the agglomeration process is usually divided into three work stages, between which reheating to the forming temperature is required.
  • a temperature transition area is created in the profile towards the cold rail end, which results in a metallurgical change in the material structure.
  • This structural change which occurs in particular in a temperature range of 750 to 760 ° C with pearlitic rail steel, has a kind of soft annealing effect. The longer the rail steel is in this temperature range, the greater this soft annealing effect and thus the decrease in strength.
  • the length of the structural change zone is directly dependent on the forming temperature and the duration of the hot forming process.
  • the drop in strength of the hardness trough reaches orders of magnitude of 150 to 200 N / mm 2, and the wheel overflow results in a dent length which is in a range of approximately 120 mm. Dents can only be prevented if the length range in which a drop in hardness or a hardness trough is observed is limited to approximately 30 mm, since plastic deformation due to Hertzian surface pressure depending on the wheel diameter and thus a dent formation is reliably prevented. If the structure change zone is limited to such lengths, the support of the edge zone structure is sufficient to avoid plastic deformation.
  • DE-AS 25 41 978 already shows a process in which rails are heat-treated for the purpose of forming a fine pearlitic structure.
  • the heating covers the entire length of the rail, using a continuous process.
  • cooling is carried out in a controlled manner using compressed air or compressed air with a liquid medium.
  • the method according to the invention essentially consists in that the heat treatment is carried out simultaneously with or immediately after the hot forming of the tongue rail end, that the transition region has a depth of at least 7 mm, preferably at least 10 mm, and preferably at most 25 mm , is heated above the austenitizing temperature, in particular above 860 ° C., and is cooled in still air after reaching the austenitizing temperature.
  • This heat treatment restores the original state of the pearlitic structure, the selected depth of penetration being chosen with a view to the fact that the maximum stress is usually about 7 mm below the workpiece surface.
  • An essential factor for heat treatment is the shortest possible heating time to the forming temperature in order to prevent the heat from spreading to the cold rail end.
  • the workpieces are in a temperature range of approx. 400 to 450 ° C in the area of the microstructure change zone, whereby the heating-up time for the subsequent heat treatment can be shortened considerably by the fact that the heat treatment immediately after the hot shaping of the tongue rail end is made. In this way, the heat treatment can be limited to a short length.
  • the heat treatment is advantageously limited to the rail head.
  • the cooling then takes place in still air, whereby the original structural state is reached before the forming.
  • the procedure according to the invention is such that a length range of at least 150 mm, preferably at least 300 mm, is subjected to the heat treatment at the transition zone between the standard rail profile and the tongue end.
  • the maximum length range can vary depending on the duration of the hot forming process This is usually limited to less than 900 mm.
  • the control of the heat treatment is preferably carried out in such a way that the length of the structural change zone formed by reshaping the tongue is kept less than 30 mm in the longitudinal direction of the rail.
  • the device according to the invention for carrying out this method is essentially characterized in that a burner with a controllable flame temperature is mounted such that it can be moved over the surface of the rail, the travel of which is limited, preferably by adjustable limit switches, that the burner is mounted in a support with a reversible drive and that a temperature measuring device is provided for detecting the surface temperature of the rail.
  • the design is such that the fuel gas and / or combustion air or.
  • Oxygen supply and / or the linear travel speed of the burner along the rail is regulated as a function of temperature measurement values, the temperature measurement device preferably being connected via control lines to a process computer which is connected to a controllable valve arrangement of a gas-oxygen mixing device for the burner.
  • a process computer-controlled system has proven to be particularly advantageous.
  • the burner bundles are mounted on a support and the heat treatment length can be optimally adjusted using limit switches.
  • the introduction of heat can be monitored via a temperature measuring device, for example as a miliscope or pyrometer, whereby the hardness of the flame can be regulated by a process computer and in particular is operated with a hard flame in the heating process and is only operated with a soft flame in the holding stage. In this way, overheating of the areas that are already at the transition temperature can be ruled out.
  • FIG. 1 shows a schematic side view of the device according to the invention and FIG. 2 shows a view in the direction of arrow II in FIG. 1 shows a movable support 1 which carries burner 2.
  • the burners 2 are water-cooled bundle burners, the flame direction of which is directed towards the head 3 of a rail 4.
  • the burners are connected via gas lines 5 to a valve arrangement of a gas-oxygen mixing device which is shown schematically in FIG.
  • limit switches 7 and 8 are arranged, which serve to limit the path of the support.
  • Above the rail is a temperature measuring device 9, which is connected to a process computer 11 via signal lines 10.
  • a display device for the measured temperature is designated by 12.
  • the drive 13 for the support is arranged on the side next to the rail.
  • the limit switches 7 and 8 for path limitation are also located in the area of the movable drive.
  • the support can be moved on a table 14 and is supported on this table 14.
  • the travel range of the support is usually limited to 600 to 900 mm, whereby the minimum travel path is usually chosen to be around 300 mm. Cooling in still air has proven to be sufficient to avoid undesired hardening and only to restore the state that prevailed before heating to the hot forming temperature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Articles (AREA)
  • Screw Conveyors (AREA)
  • Chutes (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Seats For Vehicles (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Paper (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Railway Tracks (AREA)
EP86890076A 1985-03-25 1986-03-24 Procédé et dispositif pour éviter le bosselage de rails dans la zone de transition entre l'extrémité et le profil de l'aiguille Expired - Lifetime EP0199706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0088785A AT391707B (de) 1985-03-25 1985-03-25 Verfahren zum verhindern der eindellung von schienen im uebergangsbereich sowie vorrichtung zur durchfuehrung dieses verfahrens
AT887/85 1985-03-25

Publications (3)

Publication Number Publication Date
EP0199706A2 true EP0199706A2 (fr) 1986-10-29
EP0199706A3 EP0199706A3 (en) 1987-05-13
EP0199706B1 EP0199706B1 (fr) 1990-03-14

Family

ID=3502117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890076A Expired - Lifetime EP0199706B1 (fr) 1985-03-25 1986-03-24 Procédé et dispositif pour éviter le bosselage de rails dans la zone de transition entre l'extrémité et le profil de l'aiguille

Country Status (9)

Country Link
EP (1) EP0199706B1 (fr)
AT (2) AT391707B (fr)
CS (1) CS266577B2 (fr)
DD (1) DD244990A5 (fr)
DE (1) DE3669538D1 (fr)
HU (1) HU195545B (fr)
NO (1) NO161632C (fr)
PL (1) PL145456B1 (fr)
YU (2) YU44545B (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB448416A (en) * 1933-09-06 1936-05-27 Oxweld Railroad Service Compan Improvements in or relating to the surface hardening of rails and to rails treated thereby
US2484897A (en) * 1946-10-22 1949-10-18 Linde Air Prod Co Apparatus for heat-treating surfaces of rails
DE800867C (de) * 1949-10-25 1950-12-11 Deutsche Bundesbahn Verfahren und Vorrichtung zum Beseitigen von Riffeln auf Schienen
BE626486A (fr) * 1961-12-27
DE2541978C3 (de) * 1975-09-20 1978-08-24 Butzbacher Weichenbau Gmbh, 6308 Butzbach Verfahren zur Wärmebehandlung von Weichenteilen im Durchlaufverfahren
DE2821227C2 (de) * 1978-05-16 1982-12-23 Krupp Stahl Ag, 4630 Bochum Verfahren zur Herstellung von Schienen mit verminderter Riffelbildung

Also Published As

Publication number Publication date
CS266577B2 (en) 1990-01-12
YU44545B (en) 1990-08-31
HUT43655A (en) 1987-11-30
HU195545B (en) 1988-05-30
PL145456B1 (en) 1988-09-30
CS193786A2 (en) 1989-04-14
YU36586A (en) 1988-06-30
EP0199706B1 (fr) 1990-03-14
NO161632B (no) 1989-05-29
NO161632C (no) 1989-09-06
EP0199706A3 (en) 1987-05-13
ATE51036T1 (de) 1990-03-15
NO861149L (no) 1986-09-26
YU44642B (en) 1990-10-31
DE3669538D1 (de) 1990-04-19
YU164387A (en) 1988-12-31
AT391707B (de) 1990-11-26
DD244990A5 (de) 1987-04-22
ATA88785A (de) 1990-05-15

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