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 PDFInfo
- 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
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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.
Description
- The present invention relates to a method and a railway truck for surface-aligning two rail portions welded together.
- As is well known to the expert of the art, 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 machining of these portions by a grinding wheel is a lengthy procedure with only approximate machining precision.
- 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.
- Further characteristics and advantages of the invention will be more apparent from the description of a preferred but non-exclusive embodiment of the method and railway truck for surface-aligning two rail portions welded together in a weld region according to the invention, illustrated by way of non-limiting example in the accompanying drawings, in which:
-
Figure 1 is a section through a rail to be machined by a device of the present invention; -
Figure 2 is a view of the milling cutter of a device for surface-aligning two rail portions welded together in a weld region; -
Figure 3 is a view of an alternative embodiment of the milling cutter ofFigure 2 ; -
Figure 4 is a schematic side view of a device for surface-aligning two rail portions welded together, while machining two rails welded together; -
Figure 5 is a simplified section taken on the line A-A ofFigure 4 ; -
Figure 6 is a plan view of a detail of the device ofFigure 4 ; -
Figure 7 is a side view of the detail ofFigure 6 ; and -
Figure 8 is a front view of the detail ofFigure 6 . - With reference to said figures, 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 ofcylindrical elements plate 5 is slidably mounted on said guide 4. To theplate 5 there are welded twoelements 6 for its engagement with the guide 4 and anelement 7 with a threaded through hole in which ascrew 8 is engaged, rotatably fixed between the twouprights 2 and rotated by a respective motor 9. Thescrew 8 passes without contact throughsuitable holes 10 provided in theengagement elements 6. - On the opposite face to that on which the
engagement elements 6 are fixed, theplate 5 presents fourguide elements 11 to engage in pairs with a guide formed by a pair oftubular elements 13A, B. On the same face there is also provided, welded in a central position, anelement 12 with a threaded through hole engaged by a screw (not shown) rotated by asecond motor 15 and rotatably fixed to aframe 21 rigid with the milling head and supporting themotor 15. Thetubular elements 13A, 13B are also fixed to saidframe 21. Themilling head 16 comprises amilling cutter 18 rotated about its axis A by asuitable motor 20, preferably electric. - To complete the description of the said device it should be noted that 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 themilling head 16 is of the type comprisingfishbone teeth 19 and is well visible inFigure 3 . It presents afirst milling surface 30 to machine the upper portion of said rail. Thisfirst 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 asecond surface 31, adjacent to the first, to machine the inner side portion of the rail, and athird 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.
- 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 themilling cutter 18 is started. Themotor 15 is operated to lower themilling cutter 18 onto the rail. The position of themilling cutter 18 is controlled by suitable sensors and drives. When the cutter reaches the desired working position, i.e. that ofFigure 3 , the motor 9 is operated to move the milling head longitudinally along the guide 4 and hence along the length of therail 40. - The milling cutter proceeds to skim the rail but without machining it. In this respect the cutter profile coincides with that of the rail, and the cutter rotates without touching it. When the cutter has been advanced by the motor 9 to the deformed weld region, the cutter removes that material excessive to the ideal rail profile. On termination of the operation, 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.
- In an alternative embodiment, a milling cutter is provided of shape substantially similar to that shown in
Figure 2 . This cutter comprises only thefirst 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. In this embodiment, means must be provided for aligning this milling cutter with the inner side of the rail. In other words, further guides and guide means must be provided to enable the head to move along an axis parallel to the cutter axis A. - These means can also be suitably provided in the first described embodiment, in particular to make the use of the device more flexible.
- In a further embodiment, 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. In this manner on termination of machining, 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.
- Essentially, 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. In an alternative embodiment, the method also comprises milling the rail outer side part.
Claims (10)
- A railway truck drivable along a rail track comprising a support structure (21) of a milling head (16) for surface-aligning two rail portions located under the railway truck and welded together within a weld region, said support structure being fixed to said railway truck, means (13A, 13B, 15) for positioning said milling head (16) relative to at least one of said rail portions and means (8, 9, 10) for longitudinally moving said milling head (16) along said weld region, said milling head (16) comprising at least one milling cutter (18) with a first milling surface (30) for machining the upper portion of said rail, said first surface having a shape corresponding to the upper shape of said rail in at least one portion not involving said weld, characterized in that said positioning means comprise at least one pair of locking grippers to rest on and grip the rail, said longitudinal movement means comprise at least one longitudinal guide (4A, 4B) to be brought by said positioning means into a position substantially parallel to said rail, and a second actuator (9) to drive said milling head (16) along said longitudinal guide, said milling cutter (18) comprising a second milling surface (31) for machining the inner lateral portion of said rail simultaneously with the upper portion, said second surface presenting a shape corresponding to the inner lateral shape of said rail in at least one portion not involving said weld.
- A railway truck as claimed in claim 1, characterised in that said milling cutter (18) comprises a third milling surface (32) for machining an outer lateral portion of said rail, said third surface presenting a shape corresponding to the outer lateral shape of said rail in at least one portion not involving said weld.
- A railway truck as claimed in claim 1, characterised in that said locking grippers each comprise at least one wheel.
- A railway truck as claimed in claim 3, characterised in that said positioning means comprise at least one guide transverse (13A, 13B) to said rail, and a first actuator (15) to drive said milling head along said transverse guide (13A, 13B), such as to regulate the height of said milling cutter (18) over said rail.
- A railway truck as claimed in one or more of the preceding claims, characterised in that said first and second actuator (9, 15) comprise at least one motor for rotating at least one screw (8).
- A railway truck as claimed in claim 1, characterised by comprising a device for determining the geometric profile of the rail.
- A railway truck as claimed in claim 1, characterised by comprising a device for ultrasonic testing of said weld region.
- A method for surface-aligning two rail portions welded together within a weld region with a railway truck according to claim 1, comprising the steps of by driving the railway truck over the weld region, clamping the grippers to the rail, and milling with the same milling cutter during the same pass the top part and at least the inner side part of said rail.
- A method as claimed in claim 8, characterised by milling the outer side part of said rails.
- A method as claimed in claims 9, characterised by milling the outer side part of said rails with the same milling cutter during the same pass.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL08103032T PL1983100T3 (en) | 2007-04-18 | 2008-03-27 | Method and device for surface-aligning and restoring the profile of two rail portions welded together |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000797A ITMI20070797A1 (en) | 2007-04-18 | 2007-04-18 | METHOD AND DEVICE FOR SURFACE ALIGNMENT AND RESTORATION OF THE PROFILE OF TWO RAILED PORTIONS BETWEEN THEM |
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 (en) |
ES (1) | ES2441418T3 (en) |
IT (1) | ITMI20070797A1 (en) |
PL (1) | PL1983100T3 (en) |
Cited By (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007060215A1 (en) * | 2007-12-12 | 2009-06-18 | Laurent Goer | Device for processing a running edge |
EP2947204B1 (en) * | 2014-05-19 | 2017-01-11 | Mevert Maschinenbau GmbH & Co.KG | Moveable device for milling rail heads and method for changing the cutting inserts in such a device |
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)
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 (en) * | 2000-07-17 | 2003-09-25 | Linsinger Maschinenbau Gmbh | METHOD FOR REPROFILING AT LEAST THE TRAVEL MIRROR OF A RAIL AND DEVICE THEREFOR |
RU2279333C1 (en) * | 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) | Milling cutter for working surface of rail head |
-
2007
- 2007-04-18 IT IT000797A patent/ITMI20070797A1/en unknown
-
2008
- 2008-03-27 PL PL08103032T patent/PL1983100T3/en unknown
- 2008-03-27 EP EP08103032.2A patent/EP1983100B1/en active Active
- 2008-03-27 ES ES08103032.2T patent/ES2441418T3/en active Active
Cited By (1)
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 |
---|---|
EP1983100A3 (en) | 2010-06-23 |
PL1983100T3 (en) | 2014-03-31 |
ITMI20070797A1 (en) | 2008-10-19 |
EP1983100A2 (en) | 2008-10-22 |
ES2441418T3 (en) | 2014-02-04 |
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