EP0880621A1 - Fabrication de pinces a rail elastiques - Google Patents

Fabrication de pinces a rail elastiques

Info

Publication number
EP0880621A1
EP0880621A1 EP97904527A EP97904527A EP0880621A1 EP 0880621 A1 EP0880621 A1 EP 0880621A1 EP 97904527 A EP97904527 A EP 97904527A EP 97904527 A EP97904527 A EP 97904527A EP 0880621 A1 EP0880621 A1 EP 0880621A1
Authority
EP
European Patent Office
Prior art keywords
rail
clamp
blank
workpiece
tie
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
EP97904527A
Other languages
German (de)
English (en)
Other versions
EP0880621B1 (fr
Inventor
Hartley Frank Young
Barry Marshall
Brian George Conroy
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.)
Pandrol Ltd
Original Assignee
Pandrol Ltd
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
Priority claimed from PCT/GB1996/000319 external-priority patent/WO1997030224A1/fr
Priority claimed from GBGB9620203.1A external-priority patent/GB9620203D0/en
Application filed by Pandrol Ltd filed Critical Pandrol Ltd
Publication of EP0880621A1 publication Critical patent/EP0880621A1/fr
Application granted granted Critical
Publication of EP0880621B1 publication Critical patent/EP0880621B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • E01B9/306—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped plate

Definitions

  • This invention relates to manufacturing elastic rail clamps used in rail fastening systems, and particularly, although not exclusively, to a method of manufacturing rail clamps of the kind which are applied at right angles to the rails.
  • a method of manufacturing a rail clamp for fastening a rail to an underlying rail plate or rail tie, of the type comprising a pair of substantially parallel members folded into a D configuration so as to have a front portion adapted to seat on a flange of the rail, which front portion is formed by respective free ends of the substantially parallel members, and a base portion adapted to seat in a slot in the rail plate or rail tie or in an anchoring device secured to the rail plate or rail tie, in which method the said rail clamp is made from a blank formed of round bar stock which is pressed such that the blank has rounded edges .
  • Figs . 1 to 5 illustrate steps of a previously considered method for manufacturing an elastic rail clamp
  • Figs. 6 to 10 illustrate steps of methods embodying the present invention
  • Figs. 11 shows a blank used in the previously- considered method of Figs. 1 to 5 ;
  • Fig. 12 is a side view of a clamp manufactured in accordance with the method of Figures 1 to 5 ;
  • Fig. 13 is a perspective view of a workpiece used in a method embodying the present invention
  • Fig. 14 is a perspective view of a blank manufactured in accordance with a method embodying the present invention.
  • Figs. 1 to 5 Steps of a previously-considered method of manufacturing an elastic rail clamp are shown in Figs. 1 to 5.
  • the method starts with the production of a rectangular blank 1 (Fig. 1) .
  • the blank would normally be formed from steel.
  • the rectangular blank is then split into two substantially U-shaped blanks 2 (Fig. 2) .
  • Each U-shaped blank 2 forms the basis of a rail clamp.
  • the U-shaped blank is cropped to length and the sharp edges are coined to produce smooth edges (Fig. 3) .
  • the cropping and coining operations are usually done with a hot blank. The rounding of the edges by the coining operation is necessary to avoid undue stress concentrations in the finished clamp.
  • Coining is a well-established process which attempts to improve a sheared edge to that of an edge normally associated with hot rolled steel.
  • the process is usually carried out in a power press employing a pair of dies.
  • the raw blank is placed in the dies and squeezed to form the round edges on the blank.
  • This operation is critical to the fatigue life of a spring clamp manufactured from sheared flat material and requires a high degree of quality control during processing.
  • the cropped and coined blank is then hot formed into the clamp shape shown in Fig. 4, by bending the free ends over to form toe portions 7 which bear on the rail when the clamp is in use.
  • a base portion is produced by bending the central portion of the U-shaped blank. The base portion is for engagement with the baseplate in which the clamp will be used.
  • the clamp is then subjected to a scragging operation in which the base portion 5 of the clamp is held rigidly between two jaws 6.
  • a force is applied to the toe portions 7 so as to overdeflect the clamp.
  • the force is then released.
  • the force may be applied and released more than once, for example three times, and then the clamp is removed from the jaws 6.
  • Such an operation produces a clamp 8 having the required initial stress distribution and shape.
  • Figs. 6, 7, 8 and 9 illustrate various steps of manufacturing methods embodying the present invention.
  • a round bar of material usually steel
  • a starting workpiece 10 of generally U-shaped form, having two limbs 14 interconnected by an arcuate portion 16.
  • the limbs 14 are parallel, and in the Fig. 6b workpiece the limbs 14 converge towards their free ends.
  • Figs. 7a and 7b show blanks 11 produced from the workpiece of Fig. 6a and 6b respectively.
  • the blanks are produced by heating the workpiece 10 and pressing it in an open die pressing operation.
  • the configuration of the plates of the press depends upon the final clamp shape which is required.
  • An example of such a press is shown in side elevation in Fig. 8.
  • the workpiece is placed in a lower die 22.
  • An upper die 21 is brought into contact with the workpiece 10 in the direction of arrow f in Fig. 8.
  • the blank 11 is pressed until the upper die 21 reaches stops 24 on the lower die 22.
  • the shaping of the pressure surface 23 of the upper die imparts the required shape to the blank 11.
  • the shaping of the pressure surface 23 has been exaggerated in Fig. 8 for the sake of clarity.
  • the inner and outer side faces 18, 20 of the limbs 14c and the inner surface of the arcuate portion 16 are not constrained by the plates of the press, and so the material of the workpiece 10 can flow unimpeded in the direction away from the centreline of the limbs 14 and inwardly of the arcuate portion 16 as the workpiece is pressed. Consequently, while the upper and lower faces of the workpiece 10 are flattened, the inner and outer side faces assume a rounded shape with no sharp edges.
  • the workpiece 10 may be flattened by means of a closed die pressing operation to produce a blank 11 as shown in Fig. 9a.
  • Figs. 9b and 9c show cross-sections through the lines IX ⁇ -IX ⁇ and IX C -IX C respectively.
  • the shape of the die used in the closed die pressing operation is such that the excess material overflows about the centre line of the blank and all the external edges of the blank have appropriate radii, since the die itself may be made so as to have no sharp edges, all being rounded appropriately.
  • a final "clipping" operation to remove excess material is required before the blank is hot formed into the final clip shape.
  • the thickness of the blank 11 may be varied according to the geometric shape requirements of the clamp and the stress levels which will be present in the various parts of the finished and installed clamp.
  • an end region 12 of the blank 11, corresponding to the arcuate portion 16 of the workpiece 10 of Fig. 6a, has been tapered. Such tapering may be required so that the clamp can be engaged with a baseplate.
  • the shape of the remaining parts of the blank 11 are chosen to optimise the stiffness of and the stress distribution in the finished clamp. For example, high stress regions may be thicker than low stress regions . Thinner low stress regions would allow greater deflection of the clamp when in use.
  • the flattened blank 11 is formed into a clamp 13 of the required shape.
  • the clamp shown in Fig. 10 is of the type described in US Patent No. 4,313,563, although the method would be applicable to other shapes of clamp, for example those described in International Patent Application No. PCT/GB96/00319 or U.S. Patent No. 3,067,947.
  • the clamp 13 is formed by bending the free ends of the blank 11 to form toe portions 14 which will bear on the rail when the clamp is in use.
  • a base portion is formed by bending the tapered end portion 12 of the blank 11 over the central portion of the blank.
  • the blank 2 (Fig. 2) used in the previously- considered manufacturing method is cut from a rolled steel sheet produced by rolling steel ingots. Such ingots contain impurities or inclusions particularly in central regions of the ingots. As shown in Fig. 11, these inclusions 31 are concentrated in a central region of the rolled sheet 30. Blanks 32 and 33 are cut from the sheet 30, and so the finished clamp will contain inclusions at its edges as shown in Fig. 12. Lines AA and BB in Fig. 11 show the positions of highest stress in the finished clamp. As will be appreciated from Fig. 11 there are three sheared edges having inclusions 31 in the regions of highest stress in the finished clamp. Fatigue failures can initiate and grow from these inclusions.
  • the inclusions are kept within the clamp and are not present at the edges of the finished clamp.
  • inclusions 31 in the bar stock are concentrated within the bar 34.
  • the inclusions 31 are kept within the pressed blank 35 and hence away from the edges of the finished clamp, as shown in Fig. 14. Such a distribution of inclusions in the clamp reduces the likelihood of fatigue failure of the clamp.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forging (AREA)
  • Railway Tracks (AREA)
  • Body Structure For Vehicles (AREA)
  • Clamps And Clips (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

Dans un procédé de production de pinces à rail (13) destinées à assujettir un rail à une plaque sous-jacente ou traverse, on fabrique la pince à partir d'une ébauche consistant en une barre ronde sur laquelle a été exercée une pression de manière à obtenir une ébauche aux bords arrondis. Ce procédé est applicable à la production d'une pince à rail du type comportant, d'une part, deux éléments sensiblement parallèles (14) pliés en D de manière à avoir une partie antérieure à même de porter sur un rebord du rail, cette partie antérieure étant formée par les extrémités libres respectives des éléments sensiblement parallèles et, d'autre part, une partie servant de base (12) à même de se placer dans une rainure de la plaque de rail ou traverse ou bien dans un dispositif ancré fixé à la plaque ou traverse de rail.
EP97904527A 1996-02-13 1997-02-11 Fabrication de pinces a rail elastiques Expired - Lifetime EP0880621B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
WOPCT/GB96/00319 1996-02-13
PCT/GB1996/000319 WO1997030224A1 (fr) 1996-02-13 1996-02-13 Crapauds elastiques
GBGB9620203.1A GB9620203D0 (en) 1996-09-27 1996-09-27 Manufacturing elastic rail clamps
GB9620203 1996-09-27
PCT/GB1997/000381 WO1997030225A1 (fr) 1996-02-13 1997-02-11 Fabrication de pinces a rail elastiques

Publications (2)

Publication Number Publication Date
EP0880621A1 true EP0880621A1 (fr) 1998-12-02
EP0880621B1 EP0880621B1 (fr) 2000-09-06

Family

ID=26308440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97904527A Expired - Lifetime EP0880621B1 (fr) 1996-02-13 1997-02-11 Fabrication de pinces a rail elastiques

Country Status (8)

Country Link
EP (1) EP0880621B1 (fr)
AU (1) AU1730297A (fr)
BG (1) BG102681A (fr)
DE (1) DE69703029D1 (fr)
EA (1) EA000383B1 (fr)
PL (1) PL183779B1 (fr)
TR (1) TR199801560T2 (fr)
WO (1) WO1997030225A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2270299A1 (fr) 1998-10-14 2000-04-14 Jude Igwemezie Dispositif de retention de rail
CN102642122B (zh) * 2012-04-25 2014-04-16 安阳市利达铁路器材有限责任公司 轨卡切割工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982692A (en) * 1974-07-19 1976-09-28 R. Stahl Aufzuege Gmbh Clamping means for elevator guide rails and the like
US4313563A (en) * 1978-06-27 1982-02-02 Ralph Mckay Limited Rail fastener
DE3606964A1 (de) * 1985-03-06 1986-09-11 Günter Dipl.-Ing. 5600 Wuppertal Marcus Verfahren und gesenk zum herstellen einer winkelfuehrungsplatte
AU630250B2 (en) * 1989-11-13 1992-10-22 General And Railway Supplies Pty Ltd Resilient rail retaining clip

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9730225A1 *

Also Published As

Publication number Publication date
AU1730297A (en) 1997-09-02
TR199801560T2 (xx) 1998-11-23
PL183779B1 (pl) 2002-07-31
PL328327A1 (en) 1999-01-18
BG102681A (en) 1999-04-30
EA000383B1 (ru) 1999-06-24
DE69703029D1 (de) 2000-10-12
WO1997030225A1 (fr) 1997-08-21
EP0880621B1 (fr) 2000-09-06
EA199800716A1 (ru) 1999-04-29

Similar Documents

Publication Publication Date Title
CN101873901B (zh) 冲压装置用模具及开放式拉深成形方法
US3142891A (en) Method of forming rigid contact tails
CN1026086C (zh) 传送带连接件及其生产方法
JPH04284921A (ja) 曲げ加工型
CN111867747A (zh) 冲压成型用的金属板、冲压成型装置和冲压部件的制造方法
JPS6134003B2 (fr)
EP0150818A2 (fr) Procédé et appareil de formage par presse
EP0880621B1 (fr) Fabrication de pinces a rail elastiques
EP0468460B1 (fr) Borne de contact électrique et procédé pour sa fabrication
US4825541A (en) Method of making contact springs
CN107666974B (zh) 半开口式冲压件的成型
US5238511A (en) Double C-shaped clamp
JP7564448B2 (ja) プレス成形品の製造方法及び製造設備
CZ241298A3 (cs) Způsob výroby pružných kolejnicových svorek
EP1755805B1 (fr) Procede de pressage a froid d'une plaque metallique sans plissage, pour fabriquer un logement d'essieu
JPH08126263A (ja) 電気機器の積層鉄心およびその製造方法
CA1042644A (fr) Methode de faconnage d'un collier de fixation a vis de serrage
JP2644456B2 (ja) ベルト連結用金具およびその製造方法
US6353980B1 (en) Spur with a U-shaped heel section and a neck
WO2024210110A1 (fr) Dispositif de moulage à la presse et procédé de production d'un article moulé à la presse
WO1997030224A9 (fr) Crapauds elastiques
WO1997030224A1 (fr) Crapauds elastiques
US20230302519A1 (en) Press-forming method
US1452225A (en) Process of forming curved flanged bars
JPH0330447B2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19980908

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FI FR GR IT NL

AX Request for extension of the european patent

Free format text: LT PAYMENT 980908;RO PAYMENT 980908;SI PAYMENT 980908

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19991022

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FI FR GR IT NL

AX Request for extension of the european patent

Free format text: LT PAYMENT 19980908;RO PAYMENT 19980908;SI PAYMENT 19980908

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20000906

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000906

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000906

REF Corresponds to:

Ref document number: 69703029

Country of ref document: DE

Date of ref document: 20001012

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20001207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20001208

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20070227

Year of fee payment: 11

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20080901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080901