EP1983100B1 - Method and device for surface-aligning and restoring the profile of two rail portions welded together - Google Patents

Method and device for surface-aligning and restoring the profile of two rail portions welded together Download PDF

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Publication number
EP1983100B1
EP1983100B1 EP08103032.2A EP08103032A EP1983100B1 EP 1983100 B1 EP1983100 B1 EP 1983100B1 EP 08103032 A EP08103032 A EP 08103032A EP 1983100 B1 EP1983100 B1 EP 1983100B1
Authority
EP
European Patent Office
Prior art keywords
rail
milling
railway truck
weld
milling cutter
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.)
Active
Application number
EP08103032.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1983100A2 (en
EP1983100A3 (en
Inventor
Amedeo Iafrati
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.)
Plasser Italiana Srl
Original Assignee
Plasser Italiana Srl
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 Plasser Italiana Srl filed Critical Plasser Italiana Srl
Priority to PL08103032T priority Critical patent/PL1983100T3/pl
Publication of EP1983100A2 publication Critical patent/EP1983100A2/en
Publication of EP1983100A3 publication Critical patent/EP1983100A3/en
Application granted granted Critical
Publication of EP1983100B1 publication Critical patent/EP1983100B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
    • E01B31/02—Working rail or other metal track components on the spot
    • E01B31/12—Removing metal from rails, rail joints, or baseplates, e.g. for deburring welds, reconditioning worn rails
    • E01B31/13—Removing metal from rails, rail joints, or baseplates, e.g. for deburring welds, reconditioning worn rails by milling

Definitions

  • the present invention relates to a method and a railway truck for surface-aligning two rail portions welded together.
  • the rails used in known railway lines have to be welded together.
  • the common welding operations are carried out using a railway truck presenting at least one pair of grippers to grip the two rail portions to be welded together and press them forcibly against each other.
  • a flash weld is then made in the contact region between the two portions to partially fuse the constituent metal of the rails.
  • the result obtained by this process is a single rail presenting a cusp at the welded portion.
  • This cusp must necessarily be removed and the rail surface be levelled and aligned. Said cusp is currently removed by grinding the rail.
  • the grinding operations involve moving a portable grinding wheel from the top of the rail head to its inner side, to obtain a surface in the weld region which corresponds to the standard rail shape.
  • the critical machining operations are those on the top of the rail head and its inner part, on which the train wheels rest.
  • the object of the present invention is to provide a method and a railway truck which enable the weld region of two rails to be machined with precision, speed and reliability.
  • these show a device, indicated overall by the reference numeral 1, for surface-aligning two rail portions welded together in a weld region.
  • the device 1 comprises a pair of uprights 2 between which a double-T beam 3 is provided supporting a guide 4 composed of a pair of cylindrical elements 4A, 4B.
  • a plate 5 is slidably mounted on said guide 4.
  • the screw 8 passes without contact through suitable holes 10 provided in the engagement elements 6.
  • the plate 5 presents four guide elements 11 to engage in pairs with a guide formed by a pair of tubular elements 13A, B.
  • the tubular elements 13A, 13B are also fixed to said frame 21.
  • the milling head 16 comprises a milling cutter 18 rotated about its axis A by a suitable motor 20, preferably electric.
  • a locking gripper is fixed to each of the uprights 2, to grip a rail portion.
  • This locking gripper also presents a wheel for its resting and movement on said rail.
  • This described structure is fixed to a conventional railway truck, so that the structure can be raised from or lowered onto the rails, to enable the locking grippers to firmly grip them.
  • the clamping action of the grippers also enables the device to be maintained stable during the milling operation.
  • the milling cutter 18 mounted on the milling head 16 is of the type comprising fishbone teeth 19 and is well visible in Figure 3 . It presents a first milling surface 30 to machine the upper portion of said rail. This first surface 30 is of shape corresponding to the shape of the top of the head of said rail. Essentially it perfectly reproduces the shape of the top of the rail head in that part where no weld is present, hence where the shape of the rail head is standard.
  • the milling cutter also presents a second surface 31, adjacent to the first, to machine the inner side portion of the rail, and a third surface 32, also adjacent to the first, to machine the outer portion.
  • These second and third surfaces also have a shape corresponding to the lateral shape of the head of said rail where it does not comprise the weld and presents its original form.
  • the invention operates in the following manner.
  • the railway truck After welding two rails together, the railway truck is driven over the weld region. The wheels of the locking grippers are then rested on the rail, straddling the region comprising the weld.
  • the guide 4 is then substantially parallel to the rail 40.
  • the grippers are clamped and the motor of the milling cutter 18 is started.
  • the motor 15 is operated to lower the milling cutter 18 onto the rail.
  • the position of the milling cutter 18 is controlled by suitable sensors and drives.
  • the motor 9 When the cutter reaches the desired working position, i.e. that of Figure 3 , the motor 9 is operated to move the milling head longitudinally along the guide 4 and hence along the length of the rail 40.
  • the milling cutter proceeds to skim the rail but without machining it.
  • the cutter profile coincides with that of the rail, and the cutter rotates without touching it.
  • the cutter removes that material excessive to the ideal rail profile.
  • the joint region has been perfectly machined and its profile corresponds to that of the rail in any position in which no weld has been made. Consequently the surfaces of the two welded rails are perfectly aligned.
  • a milling cutter is provided of shape substantially similar to that shown in Figure 2 .
  • This cutter comprises only the first machining surface 30 and second machining surface 31 (which are identical to those already described), so that it machines the rail only on those surfaces which are essential for correct resting of a railway truck wheel on it.
  • means must be provided for aligning this milling cutter with the inner side of the rail.
  • further guides and guide means must be provided to enable the head to move along an axis parallel to the cutter axis A.
  • means can also be provided to adjust the axis of inclination of the cutting tool, again to obtain improved flexibility.
  • the described railway truck can also comprise a device (for example laser) for determining the geometric profile of the rail after milling, and/or a testing device using ultrasound, radiography, penetrating liquids, magnetic resonance, etc. for the welded region.
  • a geometrical and siderurgical report can be obtained for the welded and machined portion, to check its characteristics and tolerances.
  • the geometrical report will contain a graph representing differences in tenths of millimetres between the inner surface of the rail head and a perfectly straight line of length one metre and between the upper surface of the rail (rolling plane) and said line.
  • the siderurgical report obtained by a non-destructive method (penetrating liquids, radiography or the like), is intended to verify the weld quality, i.e. whether the material is integral and exactly identical to that of another region of the rail.
  • the overall objective of the invention is to restore the rail region (relative to its head) neighbouring the weld to the quality standard as supplied, and to demonstrate this fact.
  • the invention relates to a method for surface-aligning two rail portions welded together within a weld region, consisting of milling the top and at least the inner side of said rails in a single pass.
  • the method also comprises milling the rail outer side part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Milling Processes (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Escalators And Moving Walkways (AREA)
EP08103032.2A 2007-04-18 2008-03-27 Method and device for surface-aligning and restoring the profile of two rail portions welded together Active EP1983100B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08103032T PL1983100T3 (pl) 2007-04-18 2008-03-27 Sposób oraz urządzenie do wyrównywania powierzchniowego oraz przywrócenia profilu dwóch części szyn zespawanych ze sobą

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000797A ITMI20070797A1 (it) 2007-04-18 2007-04-18 Metodo e dispositivo per l'allineamento superficiale ed il ripristino del profilo di due porzioni di rotaia saldate tra loro

Publications (3)

Publication Number Publication Date
EP1983100A2 EP1983100A2 (en) 2008-10-22
EP1983100A3 EP1983100A3 (en) 2010-06-23
EP1983100B1 true EP1983100B1 (en) 2013-10-09

Family

ID=39643975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08103032.2A Active EP1983100B1 (en) 2007-04-18 2008-03-27 Method and device for surface-aligning and restoring the profile of two rail portions welded together

Country Status (4)

Country Link
EP (1) EP1983100B1 (es)
ES (1) ES2441418T3 (es)
IT (1) ITMI20070797A1 (es)
PL (1) PL1983100T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017147488A3 (en) * 2016-02-24 2017-10-05 Holland, L.P. Portable rail weld milling machine apparatus and methods of using the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007060215A1 (de) * 2007-12-12 2009-06-18 Laurent Goer Vorrichtung zum Bearbeiten einer Fahrkante
EP2947204B1 (de) * 2014-05-19 2017-01-11 Mevert Maschinenbau GmbH & Co.KG Verfahrbare Vorrichtung zum Fräsen von Schienenköpfen und Verfahren zum Wechsel von Schneidplatten bei einer derartigen Vorrichtung
US20180245292A1 (en) 2017-02-24 2018-08-30 Holland, L.P. Portable Weld Milling Machine Apparatus and Methods of Using the Same
US10654117B2 (en) 2016-03-03 2020-05-19 Kennametal Inc. Cutting tool assembly for milling a rail top

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889575A (en) * 1972-04-07 1975-06-17 Elektro Thermit Gmbh Device for profiling the rail head of vignoles rails
AT410951B (de) * 2000-07-17 2003-09-25 Linsinger Maschinenbau Gmbh Verfahren zum reprofilieren mindestens des fahrspiegels einer schiene sowie einrichtung hierzu
RU2279333C1 (ru) * 2004-12-22 2006-07-10 Федеральное государственное унитарное предприятие Всероссийский научно-исследовательский и конструкторско-технологический институт подвижного состава Министерства путей сообщения Российской Федерации (ФГУП ВНИКТИ МПС России) Фреза для обработки поверхности головки рельса

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017147488A3 (en) * 2016-02-24 2017-10-05 Holland, L.P. Portable rail weld milling machine apparatus and methods of using the same

Also Published As

Publication number Publication date
ITMI20070797A1 (it) 2008-10-19
PL1983100T3 (pl) 2014-03-31
ES2441418T3 (es) 2014-02-04
EP1983100A2 (en) 2008-10-22
EP1983100A3 (en) 2010-06-23

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