EP2528702A1 - Methods of manufacturing a resilient rail clip - Google Patents
Methods of manufacturing a resilient rail clipInfo
- Publication number
- EP2528702A1 EP2528702A1 EP10796315A EP10796315A EP2528702A1 EP 2528702 A1 EP2528702 A1 EP 2528702A1 EP 10796315 A EP10796315 A EP 10796315A EP 10796315 A EP10796315 A EP 10796315A EP 2528702 A1 EP2528702 A1 EP 2528702A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bent rod
- amount
- load
- deflection
- predetermined
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/36—Making other particular articles clips, clamps, or like fastening or attaching devices, e.g. for electric installation
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
- E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
- E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
- E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
- E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
- E01B9/303—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped bar
Definitions
- the present invention relates to a method of manufacturing a resilient rail clip.
- Various forms of resilient rail clips are known, for example as shown and described in GB1510224A and EP0619852B.
- a known method of manufacturing a resilient rail clip comprises bending a metal rod (usually made of steel) into a predetermined shape and then subjecting the bent rod to a cold setting process to achieve the final form of the clip.
- Such rods have a common load-deflection characteristic with a common slope (clip stiffness) up to the elastic limit of the metal from which the bent rod is formed.
- Cold setting is intended to take the bent rod beyond that elastic limit, thereby inducing a permanent deflection (set) into the resulting clip, such that if it is then unloaded and taken up the load-deflection characteristic a second time, the load-deflection characteristic will be linear up to a much higher load, that is up to the load at which the new characteristic intercepts that for the original rod.
- One of the key problems in cold- setting is that the metal rods from which the clips are made themselves vary in hardness, typically between 44 and 48 Rockwell hardness.
- a method of manufacturing a resilient rail clip comprising bending a rod, made of metal having a hardness value falling within a known hardness value range, into a predetermined shape and then subjecting the bent rod to a cold setting process in order to induce in the bent rod a predetermined amount of permanent set
- the cold setting process comprises: applying a first load to part of the bent rod so as to cause a first amount of deflection of that part of the bent rod, which first load is a predetermined load having a value equal to or greater than that required to reach the yield point of metal having the highest hardness value in the said hardness value range; measuring the first amount of deflection of the said part of the bent rod achieved by applying the predetermined first load; determining, on the basis of the measured deflection amount, either (i) a second load, which, when applied to the said part of the bent rod, will cause the bent rod to acquire the predetermined amount of permanent set, or (ii) a second amount of
- a method of manufacturing a resilient rail clip comprising bending a rod, made of metal having a hardness value falling within a known hardness value range, into a predetermined shape and then subjecting the bent rod to a cold setting process in order to induce in the bent rod a predetermined amount of permanent set, wherein the cold setting process comprises: deflecting part of the bent rod by a predetermined first amount by applying a first load having a value equal to or greater than that required to reach the yield point of metal having the highest hardness value in the said hardness value range; measuring the amount of the first load required to achieve the
- predetermined first amount of deflection determining, on the basis of the measured first load, either (i) a second deflection amount required in order to bring about in the bent rod the predetermined amount of permanent set, or (ii) a second load, which, when applied to the said part of the bent rod, will cause the bent rod to acquire the predetermined amount of permanent set; and deflecting the said part of the bent rod by the determined second deflection amount or applying the determined second load to the said part of the bent rod.
- Figures 1A to 1 C show the load-deflection characteristics of two rail clips of different respective hardness which have been cold set according to a previously-proposed method
- FIGS. 2A and 2B show respective flow diagrams depicting two alternative cold setting processes used in embodiments of the present invention
- Figure 3A shows a rail clip undergoing part of a cold setting process used in an embodiment of the present invention and Figure 3B shows the same rail clip after cold setting with a set caused by that cold setting process;
- Figures 4A and 4B each show the load-deflection characteristics of two rail clips of different respective hardness, the thicker lines showing the characteristics after the clips have been cold set according to a method embodying the present invention and the thinner lines showing the characteristics of the clips before cold setting, in which Figures 4A and 4B correspond respectively to methods embodying the first aspect and the second aspect of the present invention.
- a rod of metal having a hardness value falling within a known hardness value range, is bent into a predetermined clip shape (see Figure 3A) and then subjected to a two-stage cold setting process, as shown in the flow diagrams of Figure 2A or 2B.
- the rod is loaded to a level equal to or beyond the yield point of a rod having a hardness value at the top of the hardness value range (STEP 1 ). Then, depending on the method being used, either a measurement is taken of how much deflection d x has resulted in STEP 1 from a fixed applied force F 0 (STEP 2, Figure 2A), or how much force F x has been required in STEP 1 to reach a fixed deflection d c (STEP 2, Figure 2B).
- the measured deflection d x is then used to determine the amount of force F 0 + ⁇ ⁇ or second deflection amount d x + Ad x (STEP 3, Figure 2A) required in order to induce in the bent rod a predetermined amount of permanent set S in a second stage of the process, during which the larger force or deflection is applied to the rod.
- the measured force F x is then used to determine the deflection d 0 + Ad x or second load F x + AF X (STEP 3, Figure 2B) required in order to induce in the bent rod a predetermined amount of permanent set S in a second stage of the process, during which the larger deflection or force is applied to the rod.
- the measured values are used by equipment (and/or by a person) to find the additional force/deflection required, for example by reference to a predetermined look-up table or by calculation.
- the rod is subjected to the force or deflection determined in STEP 3 of the preceding stage, the amount of which will vary depending on the hardness of the rod, such that the resulting clip (see Figure 3B) is always set to a point that lies along a line that is parallel to the initial load-deflection characteristic of the original rod, as shown in Figures 4A and 4B.
- each clip when unloaded will always fall back along an extension of this line, and thus all clips made using this method will have the same amount of set, and therefore the same finished geometry, as each other, regardless of the hardness of the rod.
- employing a method embodying the present invention allows the geometry of the clip after the cold- setting process to be closely defined, and in particular it may be more precisely defined than the geometry of the clip before the cold-setting process.
- Figure 4A shows the load-deflection characteristics for clips of different respective hardness, before (thinner lines) and after (thicker lines) cold setting by a method embodying the first aspect of the present invention, in which a measurement is taken of how much deflection, d H (hard clip) or d s (soft clip), has resulted from application to the clip of a fixed applied force F 0> and the measured deflection for that clip (d H /d s ) is then used to determine the amount of force, F 0 + AF H (hard clip) or F 0 + AF S (soft clip), or the amount of deflection, d H + Ad H (hard clip) or d s + Ad s (soft clip), required in order to achieve a predetermined amount of permanent set S.
- d H hard clip
- d s soft clip
- Figure 4B shows the load-deflection characteristics for clips of different respective hardness, before (thinner lines) and after (thicker lines) cold setting by a method embodying the second aspect of the present invention, in which a measurement is taken of how much force, F H (hard clip) or F s (soft clip), is required in order to achieve a fixed deflection d 0 of the clip, and the measured force for that clip (F H /F S ) is then used to determine the amount of deflection, d 0 + Ad H (hard clip) or d c + Ad s (soft dip), or the amount of feree, F H + AF H (hard clip) or F s + AF S (soft clip), required in order to achieve a predetermined amount of permanent set S.
- F H hard clip
- F s soft clip
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Clamps And Clips (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Railway Tracks (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL10796315T PL2528702T3 (en) | 2010-01-27 | 2010-12-03 | Methods of manufacturing a resilient rail clip |
SI201030911T SI2528702T1 (en) | 2010-01-27 | 2010-12-03 | Methods of manufacturing a resilient rail clip |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1001301A GB2477282A (en) | 2010-01-27 | 2010-01-27 | Method of manufacturing a resilient metal rail clip with hardness within a known range |
PCT/EP2010/068893 WO2011091893A1 (en) | 2010-01-27 | 2010-12-03 | Methods of manufacturing a resilient rail clip |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2528702A1 true EP2528702A1 (en) | 2012-12-05 |
EP2528702B1 EP2528702B1 (en) | 2015-02-18 |
Family
ID=42046114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10796315.9A Active EP2528702B1 (en) | 2010-01-27 | 2010-12-03 | Methods of manufacturing a resilient rail clip |
Country Status (18)
Country | Link |
---|---|
US (1) | US20130074559A1 (en) |
EP (1) | EP2528702B1 (en) |
JP (1) | JP5677466B2 (en) |
KR (1) | KR101779394B1 (en) |
CN (1) | CN102712028B (en) |
AU (1) | AU2010344043B2 (en) |
BR (1) | BR112012017549B1 (en) |
CA (1) | CA2787694C (en) |
DK (1) | DK2528702T3 (en) |
ES (1) | ES2531309T3 (en) |
GB (1) | GB2477282A (en) |
MX (1) | MX2012008685A (en) |
PL (1) | PL2528702T3 (en) |
PT (1) | PT2528702E (en) |
RU (1) | RU2543588C2 (en) |
SI (1) | SI2528702T1 (en) |
WO (1) | WO2011091893A1 (en) |
ZA (1) | ZA201205545B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024047524A1 (en) | 2022-08-29 | 2024-03-07 | Voestalpine Turnout Technology Zeltweg GmbH | Method for producing a rail fastening, method for increasing the vibrational resistance of a tension spring for holding down a track body element, and rail fastening |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL163277C (en) * | 1974-02-26 | 1984-03-16 | Everts & Van Der Weyden Nv | METHOD FOR MAKING A RAIL CLAMP. |
GB1510224A (en) * | 1975-11-07 | 1978-05-10 | Pandrol Ltd | Railway rail fastening clip and a railway rail-and-fastening assembly employing it |
NL182379C (en) | 1978-07-19 | 1988-03-01 | Everts & Van Der Weyden Nv | METHOD OF MANUFACTURING A C-SHAPED RAIL CLAMP. |
US4300380A (en) | 1978-10-13 | 1981-11-17 | Pandrol Limited | Apparatus and a method for use in making a railway rail-fastening clip |
ZA796441B (en) | 1978-11-29 | 1980-11-26 | Pandrol Ltd | A rail clip and apparatus for making it |
NL7906455A (en) * | 1979-08-28 | 1981-03-03 | Everts & Van Der Weyden Nv | RAIL CLAMP. |
DE2965999D1 (en) * | 1979-10-26 | 1983-09-01 | Mckay Ralph Ltd | A rail clip holder |
OA09065A (en) * | 1987-10-19 | 1991-10-31 | Pandrol Ltd | Fastening railway rails. |
IN185923B (en) | 1991-12-18 | 2001-05-19 | Pandrol Ltd | |
DE69422170D1 (en) * | 1993-06-02 | 2000-01-20 | Jude Odihackukwunma Igwemezie | IMPROVED RAILWAY SLEEPER |
GB2298442B (en) * | 1995-03-03 | 1999-01-13 | Pandrol Ltd | Railway rail-fastening clip and assembly |
US7383709B2 (en) * | 2005-08-04 | 2008-06-10 | Custom Machining Services, Inc. | System and process for crimping a fitting to a fluid conduit |
JP4842758B2 (en) * | 2006-10-06 | 2011-12-21 | 太平工業株式会社 | Rail fastening method with wire spring clip |
JP5170089B2 (en) * | 2007-05-09 | 2013-03-27 | 新日鐵住金株式会社 | Thin plate press forming apparatus and press forming method |
ITRM20080078A1 (en) * | 2008-02-12 | 2009-08-13 | Cml Intarnational S P A | METHOD OF VERIFICATION AND COMMAND TO CURVE IN AN CONTINUOUS WAY A PIECE EXTENDED ACCORDING TO VARIABLE CURCATORS SPOKES AND MACHINE SO COMMANDED |
HUP0800082A2 (en) * | 2008-02-12 | 2009-10-28 | Robert Csepke | Clamping device for fastening railway rails on cross-sleeper and fastener spring thereof |
AU2010201544A1 (en) * | 2009-04-21 | 2010-11-04 | Betaswage Pty Ltd | Control of metal cold forming machines |
IT1394105B1 (en) * | 2009-05-06 | 2012-05-25 | Cml Int Spa | MACHINE TO TURN CONTINUOUSLY AN EXTENDED PIECE ACCORDING TO PREDETERMINATED RAYS |
-
2010
- 2010-01-27 GB GB1001301A patent/GB2477282A/en not_active Withdrawn
- 2010-12-03 KR KR1020127022098A patent/KR101779394B1/en active IP Right Grant
- 2010-12-03 MX MX2012008685A patent/MX2012008685A/en active IP Right Grant
- 2010-12-03 CN CN201080062326.7A patent/CN102712028B/en active Active
- 2010-12-03 ES ES10796315T patent/ES2531309T3/en active Active
- 2010-12-03 PL PL10796315T patent/PL2528702T3/en unknown
- 2010-12-03 US US13/520,522 patent/US20130074559A1/en not_active Abandoned
- 2010-12-03 WO PCT/EP2010/068893 patent/WO2011091893A1/en active Application Filing
- 2010-12-03 SI SI201030911T patent/SI2528702T1/en unknown
- 2010-12-03 PT PT107963159T patent/PT2528702E/en unknown
- 2010-12-03 RU RU2012136430/02A patent/RU2543588C2/en active
- 2010-12-03 JP JP2012550340A patent/JP5677466B2/en active Active
- 2010-12-03 AU AU2010344043A patent/AU2010344043B2/en active Active
- 2010-12-03 DK DK10796315.9T patent/DK2528702T3/en active
- 2010-12-03 BR BR112012017549A patent/BR112012017549B1/en active IP Right Grant
- 2010-12-03 EP EP10796315.9A patent/EP2528702B1/en active Active
- 2010-12-03 CA CA2787694A patent/CA2787694C/en active Active
-
2012
- 2012-07-23 ZA ZA2012/05545A patent/ZA201205545B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2011091893A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024047524A1 (en) | 2022-08-29 | 2024-03-07 | Voestalpine Turnout Technology Zeltweg GmbH | Method for producing a rail fastening, method for increasing the vibrational resistance of a tension spring for holding down a track body element, and rail fastening |
Also Published As
Publication number | Publication date |
---|---|
ZA201205545B (en) | 2013-04-24 |
ES2531309T3 (en) | 2015-03-12 |
KR20120116006A (en) | 2012-10-19 |
JP5677466B2 (en) | 2015-02-25 |
CN102712028A (en) | 2012-10-03 |
PT2528702E (en) | 2015-02-27 |
SI2528702T1 (en) | 2015-05-29 |
PL2528702T3 (en) | 2015-07-31 |
AU2010344043B2 (en) | 2014-07-17 |
US20130074559A1 (en) | 2013-03-28 |
BR112012017549B1 (en) | 2020-04-22 |
GB201001301D0 (en) | 2010-03-10 |
AU2010344043A1 (en) | 2012-08-16 |
RU2012136430A (en) | 2014-03-10 |
WO2011091893A1 (en) | 2011-08-04 |
RU2543588C2 (en) | 2015-03-10 |
MX2012008685A (en) | 2012-08-23 |
CA2787694A1 (en) | 2011-08-04 |
CN102712028B (en) | 2014-11-05 |
CA2787694C (en) | 2017-02-07 |
JP2013518196A (en) | 2013-05-20 |
KR101779394B1 (en) | 2017-09-18 |
EP2528702B1 (en) | 2015-02-18 |
BR112012017549A2 (en) | 2016-06-28 |
DK2528702T3 (en) | 2015-05-26 |
GB2477282A (en) | 2011-08-03 |
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