EP3212839A1 - Câble d'acier sans évasement et procédé correspondant - Google Patents

Câble d'acier sans évasement et procédé correspondant

Info

Publication number
EP3212839A1
EP3212839A1 EP15763032.8A EP15763032A EP3212839A1 EP 3212839 A1 EP3212839 A1 EP 3212839A1 EP 15763032 A EP15763032 A EP 15763032A EP 3212839 A1 EP3212839 A1 EP 3212839A1
Authority
EP
European Patent Office
Prior art keywords
steel
cord
filaments
steel cord
local region
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.)
Withdrawn
Application number
EP15763032.8A
Other languages
German (de)
English (en)
Inventor
Jan GALLET
Rik Mullebrouck
Hennie PAUWELS
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Publication of EP3212839A1 publication Critical patent/EP3212839A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B9/00—Binding or sealing ends, e.g. to prevent unravelling
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/104—Rope or cable structures twisted
    • D07B2201/106—Pitch changing over length
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2026—Pitch changing over length
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2015—Killing or avoiding twist

Definitions

  • the invention relates to a steel cord without flare and to a method of
  • Flare is the phenomenon that after cutting of a steel cord spreading of the filament ends or strand ends is observed. Due to the springy nature of high-carbon steel filaments, residual torsions either on cord level or on filament level or on both are present and cause the spreading if no precautions are taken.
  • a steel cord having two ends and comprising steel filaments. At least some of the steel filaments are twisted along the length of the steel cord - except for a local region at at least one of the two ends - with a cord lay length L c .
  • the steel cord has been additionally cold twisted, i.e. cold over-twisted, in a local region at at least one of the two ends in the same twisting direction of the filaments with the cord lay length L c , so that locally the steel filaments with an original lay length L c have a lay length that is less than 60%, e.g. less than 45%, e.g. less than 30%, e.g. less than 20% of the cord lay length L c in order to avoid flare.
  • a local region at at least one of the two ends means that the local region comprises the end of the steel cord or is very close to the steel cord end.
  • the invention has the advantage that no other material needs to be added and that welding and any other heat treatment is be avoided.
  • the invention is a simple measure.
  • the over-twisted steel cord end according to the invention has also shown to be more robust than a welded or burnt steel cord end. Indeed, in case the welded or burnt steel cord end hits a hard material or a spool, one or more individual filaments may become loose due to the brittleness introduced during with welding. This is not the case with an over-twisted steel cord end.
  • the local region has a length that is at least one time, preferably two or three or more times the cord lay length l_c. Usually the length of the local region corresponds to a few centimetre.
  • the invention is particularly relevant for steel cords comprising filaments that have a different torsion saturation level.
  • the torsion saturation level of a steel filament is the level at which the residual torsions no longer increase despite the increasing number of applied torsions.
  • the torsion saturation level of a steel filament is dependent upon the filament diameter, the tensile strength and the filament material, i.e. the steel composition. These steel cords often have flare, if no appropriate measures are taken.
  • tensile strength levels are normal tensile strength, high-tensile strength, super-high-tensile strength and ultra-high-tensile strength;
  • - a high-tensile strength has values ranging from 2400 MPa to 3200 MPa
  • a super-high-tensile strength has values ranging from 3200 MPa to 3800 MPa
  • - an ultra-high-tensile strength has values ranging from 3800 MPa to 4500 MPa
  • composition is different from the second steel composition; examples can be a steel composition for normal tensile strength with typically a carbon content of about 0.70 weight per cent and a steel composition for higher tensile strengths with typically a carbon content of 0.80 weight per cent and higher and possibly with micro alloying elements such as chromium in amounts greater than 0.20 weight per cent.
  • the invention is particularly appropriate for small steel cords, i.e. steel cords with a limited number of steel filaments, e.g. between two and nine, e.g. between two and six and with filament diameters below 0.40 mm, e.g. below 0.30 mm.
  • the invention has proved to be particularly useful for a steel cord with a core group and a sheath group.
  • the core group comprises core steel filaments.
  • the sheath group comprises sheath steel filaments.
  • the core steel filaments are untwisted or have a lay length greater than 300 mm - except in the local region.
  • the sheath group and the core group are twisted around each other with a cord lay length - except in said local region. This cord lay length is much smaller than 300 mm, e.g. smaller than 100 mm.
  • the core steel filaments may have a diameter di and the sheath filaments a diameter 02, where di is substantially different from 02. For example, di is greater than 02.
  • the core group may have two to four steel filaments.
  • the sheath group may have one to six steel filaments.
  • a spool filled with a steel cord according to the first aspect of the invention.
  • the local region with the over-twisting is situated at full spool. So only one steel cord end, namely the steel cord end at full spool (not the steel cord end at empty spool) needs to be over-twisted. The reason is that the steel cord end at full spool is the one which is first unwound and led to inserts.
  • a method of manufacturing a steel cord according to the first aspect comprises the following steps:
  • Figure 1 illustrates the prior art practice of welding.
  • Figure 2 illustrates the invention on particular steel cord.
  • Figure 3 illustrates the general principle of the invention.
  • Figure 1 is a longitudinal view of a steel cord 10 with a core group of three steel filaments 12 with a diameter of 0.265 mm and a sheath group of three steel filaments 14 with a diameter of 0.17 mm.
  • the lay length Lc of the cord is 14 mm.
  • one end 16 of the steel cord 10 has been burnt to weld the individual ends of the steel filaments 12, 14 together to avoid spread.
  • Figure 2 is a longitudinal view of a steel cord 20 with a core group of three steel filaments 22 with a filament diameter of 0.265 mm and a sheath group of three steel filaments 24 with a filament diameter 0.17 mm.
  • the cord lay length is 14 mm.
  • one end of the steel cord 20 has been over-twisted over a local region 26 of about 3 cm to have locally a lay length of only 3.5 mm.
  • Other specific examples are:
  • Figure 3 illustrates the general principle of the invention.
  • Figure 3 is a longitudinal view of a steel cord 30 with steel filaments 32.
  • the lay length of the steel cord is L c . At one end, over a local region /, the lay length has been reduced to L e to avoid flare.
  • the steel composition of steel cords adapted for the reinforcement of rubber products such as tyres is along the following lines: a carbon content (% C) ranging from 0.60% to 1 .20%, e.g. 0.80% to 1 .1 %;
  • a manganese content (% Mn) ranging from 0.10% to 1 .0%, e.g. from 0.20% to 0.80%;
  • a silicon content (% Si) ranging from 0.10% to 1 .50%, e.g. from 0.15% to 0.70%;
  • Steel filaments adapted for the reinforcement of tyres typically have filaments with a final diameter ranging from 0.05 mm to 0.60 mm, e.g. from 0.10 mm to 0.40 mm.
  • filament diameters are 0.10 mm, 0.12 mm, 0.15 mm, 0.175 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.245 mm, 0.28 mm, 0.30 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.40 mm.
  • Steel cords adapted for the reinforcement of rubber usually have a coating which promotes the adhesion with rubber such as a brass coating or a ternary alloy coating.

Abstract

L'invention concerne un câble d'acier (20, 30) qui a deux extrémités et comprend des filaments d'acier (32). Au moins certains des filaments d'acier (32) sont torsadés le long de la longueur du câble d'acier (20, 30), à l'exception d'une région locale (26, I) au niveau d'au moins une des deux extrémités, avec une longueur de disposition de câble Lc. Le câble d'acier (20, 30) est en outre torsadé à froid dans ladite région locale (26, I) de telle sorte que, localement, au moins certains des filaments d'acier (32) ont une longueur de disposition qui est inférieure à 60 % de la longueur de disposition de câble Lc de façon à éviter l'évasement/effilochage et faciliter un traitement ultérieur. La présente invention concerne également un procédé correspondant.
EP15763032.8A 2014-10-30 2015-09-16 Câble d'acier sans évasement et procédé correspondant Withdrawn EP3212839A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14191069 2014-10-30
PCT/EP2015/071205 WO2016066319A1 (fr) 2014-10-30 2015-09-16 Câble d'acier sans évasement et procédé correspondant

Publications (1)

Publication Number Publication Date
EP3212839A1 true EP3212839A1 (fr) 2017-09-06

Family

ID=51900107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15763032.8A Withdrawn EP3212839A1 (fr) 2014-10-30 2015-09-16 Câble d'acier sans évasement et procédé correspondant

Country Status (4)

Country Link
EP (1) EP3212839A1 (fr)
CN (1) CN107002356B (fr)
BR (1) BR112017007522B1 (fr)
WO (1) WO2016066319A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2051900A (en) * 1932-12-10 1936-08-25 Bendix Brake Co Method of making cable ends
CH277423A (de) * 1949-12-05 1951-08-31 Weinmann & Co Verfahren zur Befestigung von Kupplungsstücken an den Enden des Kabels von Bowdenzügen.
JPS57151403A (en) * 1981-03-12 1982-09-18 Bridgestone Corp Pneumatic tyre
US5238177A (en) 1992-08-10 1993-08-24 Flexible Steel Lacing Company Method and apparatus for forming conveyor belt hinge pins
EP1365063A1 (fr) 2002-05-23 2003-11-26 N.V. Bekaert S.A. Câble métallique
CN101829764A (zh) * 2010-04-17 2010-09-15 贵州钢绳股份有限公司 一种钢丝绳绳头熔融金属浇铸方法
FR2959517B1 (fr) * 2010-04-28 2012-09-21 Michelin Soc Tech Cable metallique multitorons elastique a haute permeabilite.
CN103958154A (zh) * 2011-11-28 2014-07-30 贝卡尔特公司 用于挤出工艺的钢绳以及所述钢绳的装置、方法和使用
US20150099068A1 (en) 2011-11-28 2015-04-09 Nv Bekaert Sa Steel cord for extrusion process, an apparatus and method and use of said steel cord

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016066319A1 *

Also Published As

Publication number Publication date
WO2016066319A1 (fr) 2016-05-06
BR112017007522B1 (pt) 2022-05-24
CN107002356B (zh) 2020-11-03
BR112017007522A2 (pt) 2017-12-19
CN107002356A (zh) 2017-08-01

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