EP0627521B1 - Traitement d'un câble d'acier - Google Patents

Traitement d'un câble d'acier Download PDF

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Publication number
EP0627521B1
EP0627521B1 EP19940200999 EP94200999A EP0627521B1 EP 0627521 B1 EP0627521 B1 EP 0627521B1 EP 19940200999 EP19940200999 EP 19940200999 EP 94200999 A EP94200999 A EP 94200999A EP 0627521 B1 EP0627521 B1 EP 0627521B1
Authority
EP
European Patent Office
Prior art keywords
steel cord
process according
false twister
steel
tension
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.)
Expired - Lifetime
Application number
EP19940200999
Other languages
German (de)
English (en)
Other versions
EP0627521A1 (fr
Inventor
Johan De Waegenaere
Luc Sabbe
Frans Van Giel
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
Priority to EP19940200999 priority Critical patent/EP0627521B1/fr
Publication of EP0627521A1 publication Critical patent/EP0627521A1/fr
Application granted granted Critical
Publication of EP0627521B1 publication Critical patent/EP0627521B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B3/00—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material
    • D07B3/08—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position
    • D07B3/10—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position with provision for imparting more than one complete twist to the ropes or cables for each revolution of the take-up reel or of the guide member
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/022—Measuring or adjusting the lay or torque in the rope
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/20—Type of machine
    • D07B2207/204—Double twist winding
    • D07B2207/206—Double twist winding with means for providing less than double twist, e.g. counter rotating means
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/40—Machine components
    • D07B2207/4072—Means for mechanically reducing serpentining or mechanically killing of rope

Definitions

  • the present invention relates to a process of treatment of a steel cord adapted for the reinforcement of rubber products, wherein the steel cord comprises steel filaments (see e.g. GB-A- 2 028 393).
  • Steel cords are widely known and used for the reinforcement of rubber products such as tyres, conveyor belts, timing belts and hoses.
  • the steel cords In order to fulfill their reinforcement function in a proper way, the steel cords must have a high tensile strength, a sufficient resistance to compression once embedded in rubber, a good fatigue and corrosion resistance, a sufficient adhesion to rubber and a high impact resistance.
  • Both the first and second properties are supposed to be fulfilled between narrow specified limits. It is a difficult task, if not a rather impossible one, for a cord manufacturer to meet all these requirements. This task is thwarted by the fact that, during the entire process of manufacturing of a steel cord, the result of measures taken to meet one property is wholly or partially nullified by measures taken in order to meet another property in the downstream part of the process. The consequence is that a compromise must be sought or that one or more properties must be sacrified in favour of the other properties.
  • part of the tensile strength of the steel filaments gets lost during the subsequent twisting process.
  • part of the degree of preforming may be lost during the downstream false twisting or during the downstream straightening.
  • a process of treatment of a steel cord adapted for the reinforcement of rubber products.
  • the steel cord comprises steel filaments which have been twisted to a final twist pitch.
  • the process comprises
  • the terms 'process of treatment of a steel cord' do not necessarily mean that the process can only be carried out as a so-called post-treatment on an already finished steel cord.
  • the terms 'process of treatment of a steel cord' also include processes of manufacturing a steel cord whereby the process comprises the above mentioned steps (i) to (iv) carried out on a set of steel filaments which have just been twisted or cabled in an upstream step.
  • Overtwisting the steel cord means twisting the steel cord until a twist pitch which is smaller than the twist pitch before overtwisting.
  • Plastically deforming the steel filaments by overtwisting the steel cord means that the degree of overtwisting is such that the steel filaments are deformed beyond their elastical limit.
  • Plastically deforming the steel filaments by over-twisting may decrease the radius of curvature of the steel filaments in a controllable way. The higher the degree of overtwisting in the plastical region, the smaller the radius of curvature.
  • a small radius of curvature, if small enough, corresponds to an open cord structure, which allows rubber penetration even when the cord is put under a tensile tension of about twenty to fifty Newton. This openness at tensile torsions between twenty and fifty Newton may be quantified by a P.L.E.-value in the case of single-strand constructions of the type 1xn.
  • P.L.E. means part load elongation and is the elongation of the cord at a predetermined tensile tension between twenty and fifty Newton.
  • the degree of plastical deformation of the steel filaments determines to a large extent the total elongation at fracture of the steel cord.
  • the subsequent and downstream steps (iii) and (iv) are done in order to bring the number of residual torsions to zero or to a predetermined value.
  • the advantage of the present invention is that during the steps (iii) and (iv) the steel cord is not stretched in such a way that the small radius of curvature of the steel filaments is increased again.
  • the untwisting tension is lower than 25 Newton, preferably lower than 20 Newton or 15 Newton, e.g. about 10 Newton.
  • the steel cord may be a high-elongation cord.
  • a cord comprises two to seven strands.
  • Each strand comprises two to seven steel filaments with a filament diameter between 0.10 mm and 0.35 mm.
  • the twisting direction of the filaments in a strand is equal to the twisting direction of the strands in the high-elongation cord.
  • the elongation at break of a high-elongation cord conveniently ranges from 5 to 10 %.
  • steps (i) and (ii) may be done by means of a first false twister.
  • the rotational speed of the overtwister determines the degree of overtwisting, and consequently also the degree of plastically deforming the steel filaments.
  • Steps (iii) and (iv) may be done by means of a second false twister.
  • the rotational speed of the second false twister is conveniently smaller than the rotational speed of the first false twister.
  • the process may include further steps of straightening the steel cord and/or of rolling the steel cord.
  • an apparatus for carrying out a treatment of a steel cord comprises following successive units :
  • the overtwisting means is a first false twister, the pull-though means a capstan, and the untwisting means a second false twister.
  • three steel filaments 2 are drawn from three bobbins 4 and are led to a double twister via a guiding pulley 6 where the filaments receive a first torsion.
  • the twisted steel filaments 2 are further guided by means of a flyer 8 to a reversing pulley 10 where the filaments receive a second torsion.
  • the steel cord 12 After the reversing pulley 10 the steel cord 12 has already obtained its final twist pitch.
  • the steel cord 12 passes through a first false twister 14 which overtwists the steel cord until a twist pitch which is smaller than the final twist pitch and which subsequently untwists the steel cord until its final twist pitch.
  • the false twister 14 may comprise a pair of pulleys 16, 18 around which the steel cord 12 may be wrapped a number of times.
  • False twisters are known as such in the art.
  • US-A-3,771,304 describes a false twister functioning as an overtwister.
  • the twist pitch of the steel cord is decreased, i.e. the radius of curvature of the composing steel filaments 2 is decreased. If the speed of the false twister 14 is high enough with respect to the pull through speed of the steel cord 12, the steel filaments 2 are plastically deformed.
  • a capstan 20 functions as a drive unit and draws the steel cord 12 through the upstream parts of the apparatus.
  • the tension upstream the capstan 20 is in the range 40 to 70 Newton, the tension downstream the capstan 20 is below half the tension upstream the capstan 20, and may be 10 to 20 Newton.
  • a second false twister 22 rotates in the opposite sense as the first false twister 14 and partially untwists the steel cord 12 further to a twist pitch greater than the final twist and subsequently twists again the steel cord to its final twist pitch. This is done in order to reduce or to control the residual torsions.
  • the untwisting tension is low. In fact, the untwisting tension needs only to be high enough to overcome the friction in the second false twister 22 and in the winding unit 24. This low tension avoids that the small radius of curvature of the plastically deformed steel filaments gets lost due to stretching.
  • the first false twister 14 functions as a controller of the openness, in the case of single-strand steel cords of the 1xn-type and, in the case of a high-elongation cord, as a controller of the elongation, while the second false twister 22 functions as a controller of the degree of residual torsions. Both function independently of each other thanks to the low tension level under which the second false twister is operating.
  • FIGURE 2 shows a schematic configuration of another embodiment of the present invention.
  • four steel filaments 2 are drawn from the supply bobbins 4 and are guided to a false twister 14 which is a 'first' false twister in the sense as described hereabove.
  • False twister 14 rotates with a rotational speed which is higher than twice the rotational speed of flyer 8 (the rotational speed of flyer 8 determines the final twist pitch). In this way, the steel cord 12 is overtwisted.
  • Capstan 20 draws the steel cord 12 through the upstream parts of the apparatus.
  • the overtwisting tension upstream the capstan 20 is in the range 40 to 70 Newton
  • the tension down-stream the capstan 20 is below half the overtwisting tension, and may be in the range of 10 to 20 Newton.
  • the steel cord 12 is further led to still another false twister 22 which is a 'second' false twister in the sense as described hereabove. False twister 22 rotates in the same sense as false twister 14 but at a speed which is lower than the speed of false twister 14 and lower than twice the rotational speed of flyer 8. The result is that the steel cord 12 is partially untwisted.
  • the steel cord 12 is then led over a guiding pulley 6, a flyer 8, a reversing pulley 10, a straightener 26, a roller 28 and a capstan 30 to a winding up unit 24.
  • the tension created by the capstan 28 needs only be high enough to compensate for the friction exercised by the parts of the apparatus which are downstream the first capstan 20 and is substantially lower than the tension created by the first capstan 20. Care must be exercised that the plastic deformation of the steel filaments 12 is not destroyed during the other downstream treatments such as rolling and/or straightening.
  • false twister 14 functions as a controller of the openness of the steel cord, in the case of single-strand construction of the type 1xn and, in the case of a high-elongation cord as a controller of the elongation, whereas false twister 22 functions as a controller of the residual torsions of the cord.

Landscapes

  • Ropes Or Cables (AREA)

Claims (17)

  1. Procédé de traitement d'un câble (12) d'acier conçu pour le renforcement de produits en caoutchouc, ledit câble d'acier comprenant des filaments (2) d'acier qui ont été tordus jusqu'à un pas de torsion final,
    ledit procédé comprenant :
    - une étape (i) de déformation plastique des filaments d'acier par surtordage du câble d'acier jusqu'à un pas de torsion qui est plus petit que le pas de torsion final,
    - une étape (ii) de détordage du câble d'acier jusqu'au pas de torsion final,
    - une étape (iii) de détordage supplémentaire du câble d'acier jusqu'à un pas de torsion qui est plus grand que le pas de torsion final,
    - une étape (iv) de tordage du câble d'acier à nouveau jusqu'à son pas de torsion final,
    les étapes (i) et (ii) étant conduites sous une première tension et les étapes (iii) et (iv) étant conduites sous une seconde tension, la seconde tension étant inférieure à la moitié de la première tension.
  2. Procédé selon la revendication 1, dans lequel le câble d'acier (12) comprend deux à cinq filaments (2) d'acier ayant un diamètre de filament compris entre 0,10 mm et 0,40 mm.
  3. Procédé selon la revendication 2, dans lequel la seconde tension est inférieure à 25 newtons.
  4. Procédé selon la revendication 2, dans lequel le degré de surtordage dans l'étape (i) est fixé pour déterminer l'allongement final sous charge partielle du câble d'acier (12).
  5. Procédé selon la revendication 2, dans lequel le degré de détordage supplémentaire dans l'étape (iii) est fixé pour déterminer le nombre final de torsions résiduelles du câble d'acier (12).
  6. Procédé selon la revendication 1, dans lequel le câble d'acier (12) est un câble à allongement élevé comprenant deux à sept torons, chaque toron comprenant deux à sept filaments (2) avec un diamètre de filament compris entre 0,10 et 0,35 mm.
  7. Procédé selon la revendication 6, dans lequel le degré de surtordage dans l'étape (i) est fixé pour déterminer l'allongement final du câble d'acier (12).
  8. Procédé selon la revendication 6, dans lequel le degré de détordage supplémentaire dans l'étape (iii) est fixé pour déterminer le nombre final de torsions résiduelles du câble d'acier (12).
  9. Procédé selon la revendication 1, dans lequel les étapes (i) et (ii) sont conduites au moyen d'une première machine (14) à faire des fausses torsions.
  10. Procédé selon la revendication 9, dans lequel les étapes (iii) et (iv) sont conduites au moyen d'une seconde machine (22) à faire des fausses torsions.
  11. Procédé selon la revendication 10, dans lequel la seconde machine (22) à faire des fausses torsions tourne dans le sens contraire de la première machine (14) à faire des fausses torsions.
  12. Procédé selon la revendication 10, dans lequel la seconde machine (22) à faire des fausses torsions tourne dans le même sens que la première machine (14) à faire des fausses torsions.
  13. Procédé selon la revendication 9, dans lequel la vitesse de rotation de la seconde machine (22) à faire des fausses torsions est plus petite que la vitesse de rotation de la première machine (14) à faire des fausses torsions.
  14. Procédé selon la revendication 1, dans lequel le procédé comprend une étape supplémentaire de dressage du câble d'acier (12).
  15. Procédé selon la revendication 1, dans lequel le procédé comprend une étape supplémentaire de laminage du câble d'acier (12).
  16. Appareil pour réaliser le traitement d'un câble d'acier (12), ledit appareil comprenant comme unités successives :
    - (i) un moyen de surtordage,
    - (ii) un moyen de traction,
    - (iii) un moyen de détordage.
  17. Appareil selon la revendication 16, dans lequel le moyen de surtordage est une première machine (14) à faire des fausses torsions, le moyen de traction est un cabestan (20) et le moyen de détordage est une seconde machine (22) à faire des fausses torsions.
EP19940200999 1993-04-20 1994-04-13 Traitement d'un câble d'acier Expired - Lifetime EP0627521B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19940200999 EP0627521B1 (fr) 1993-04-20 1994-04-13 Traitement d'un câble d'acier

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP93201130 1993-04-20
EP93201130 1993-04-20
EP19940200999 EP0627521B1 (fr) 1993-04-20 1994-04-13 Traitement d'un câble d'acier

Publications (2)

Publication Number Publication Date
EP0627521A1 EP0627521A1 (fr) 1994-12-07
EP0627521B1 true EP0627521B1 (fr) 1997-11-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940200999 Expired - Lifetime EP0627521B1 (fr) 1993-04-20 1994-04-13 Traitement d'un câble d'acier

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19535595C2 (de) * 1995-09-25 2000-12-07 Drahtcord Saar Gmbh & Co Kg Verfahren zur Herstellung eines spiralförmigen Drahtfilament, insbesondere zur Verstärkung von Gummi- oder Kunststoffartikeln, Vorrichtung zur Durchführung des Verfahrens und nach dem Verfahren herstelltes Drahtfilament
DE19912192C2 (de) * 1999-03-18 2001-03-08 Drahtcord Saar Gmbh & Co Kg Falschdraller und Verfahren insbesondere zum Herstellen von spiralförmigen Filamenten
DE60016582T2 (de) * 1999-12-27 2005-05-25 Fuji Seiko Co. Ltd. Herstellungsvorrichtung für einen gummibeschichteten strang
FR2990962B1 (fr) * 2012-05-25 2014-06-27 Michelin & Cie Procede de fabrication d'un cable metallique multi-torons a deux couches.
CN112813711B (zh) * 2019-11-18 2022-12-16 宝钢金属有限公司 一种精确控制钢帘线扭转波动的生产方法及其装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771304A (en) * 1971-03-16 1973-11-13 Sumitomo Electric Industries Twisting motion and process for producing wire cords
FR2433989A1 (fr) * 1978-08-22 1980-03-21 Sodetal Cable metallique et procede de fabrication
US4397141A (en) * 1981-04-15 1983-08-09 National-Standard Company Method and apparatus for making balanced metallic strand

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Publication number Publication date
EP0627521A1 (fr) 1994-12-07

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