EP0770726B1 - Câble d'acier à plusieurs torons - Google Patents

Câble d'acier à plusieurs torons Download PDF

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Publication number
EP0770726B1
EP0770726B1 EP19960202786 EP96202786A EP0770726B1 EP 0770726 B1 EP0770726 B1 EP 0770726B1 EP 19960202786 EP19960202786 EP 19960202786 EP 96202786 A EP96202786 A EP 96202786A EP 0770726 B1 EP0770726 B1 EP 0770726B1
Authority
EP
European Patent Office
Prior art keywords
strands
strand
cord
steel cord
diameter
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
EP19960202786
Other languages
German (de)
English (en)
Other versions
EP0770726A1 (fr
Inventor
Luc Bourgois
Paul Soenen
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 EP19960202786 priority Critical patent/EP0770726B1/fr
Publication of EP0770726A1 publication Critical patent/EP0770726A1/fr
Application granted granted Critical
Publication of EP0770726B1 publication Critical patent/EP0770726B1/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
    • 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
    • D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope configuration
    • 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
    • D07B2207/00—Rope or cable making machines
    • D07B2207/20—Type of machine
    • D07B2207/204—Double twist winding
    • D07B2207/205—Double twist winding comprising flyer
    • 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
    • D07B2207/207—Sequential double twisting devices

Definitions

  • the present invention relates to a steel cord comprising a number of strands twisted together, which is a so-called multi-strand steel cord.
  • multi-strand steel cords were the standard cords for reinforcing elastomeric products such as rubber tires, conveyor belts, transmission belts.
  • multi-strand steel cords are still common in reinforcing heavy tires such as off-the-road tires, conveyor belts, timing belts and transmission belts.
  • Most multi-strand steel cords are manufactured in an expensive way the last steps of which may be summarized as follows :
  • step (b), which must be carried out for each individual strand of the final cord, e.g. seven times in case of a 7x19-cord, is disadvantageous to the productivity and efficiency of the multi-strand steel cord making process.
  • FR-A-837 683 discloses a multi-strand steel cord where each of the strands is coreless.
  • a steel cord which comprises eight or more strands twisted together.
  • Each of the strands has a substantially same cord twisting direction and a substantially same cord twisting pitch.
  • Each of said strands consists of two to five individual filaments twisted together.
  • the terms "cord twisting pitch" refer to the axial distance required to make a 360 degree revolution of a strand in the final cord.
  • the fact that the strands have the same cord twisting direction and the same cord twisting pitch allow the multi-strand steel cord to be made in an economical and highly efficient way.
  • the fact that each of the strands consists of only two to five individual filaments and, as a consequence, comprises no core filament allows the make the multi-strand steel cord without experiencing problems of core filament migration in the individual strands.
  • the individual steel filaments of every strand have the same strand twisting direction and substantially the same strand twisting pitch.
  • strand twisting pitch refer to the axial distance required to make a 360 degree revolution of a filament in a strand of the final cord.
  • the number of strands in the multi-strand steel cord according to the invention is at least eight, and can be nine, twelve,fifteen... in order to provide for a suitable alternative for the prior art cord constructions 7x7, 7x19, 7x31.
  • Preferable configurations comprise twelve, nineteen or twenty-seven strands and are respectively designated by 12xn-, 19xn- and 27xn-cords, where n is the number of filaments in each strand and ranges from two to five.
  • a 12xn-cord has three center strands and nine outer strands.
  • a 19xn-cord has one center strand, six intermediate strands and twelve outer strands.
  • a 27xn-cord has three center strands, nine intermediate strands and fifteen outer strands.
  • the center strand or center strands In order to prevent the center strand or center strands from migrating out of the cord under the influence of repeated external bending forces, it is preferable that the center strand or center strands have a larger diameter than the diameter of the outer strands and/or intermediate strands.
  • the strand twisting direction may be equal to or opposite to the cord twisting direction.
  • the strand twisting pitch may be equal to or different from the cord twisting pitch.
  • the multi-strand steel cord is preferably adapted to reinforce elastomeric products, which means that it has either alone or in combination one or more of following properties :
  • the multi-strand cord according to the invention may have been covered with a synthetic material such as polyamide.
  • FIGURE 1 shows a transversal cross-section of a 12x2 multi-strand steel cord 10.
  • the cord 10 comprises three center strands 12 and nine outer strands 14.
  • Each of the center strands 12 and each of the outer strands 14 consists of only two filaments 16.
  • Each of the the center 12 and each of the outer strands 14 have the same cord twisting pitch and same cord twisting direction in the final cord 10, for example : 12 x 2 x 0.20
  • FIGURE 2 shows a transversal cross-section of a 12x3 multi-strand steel cord.
  • Steel cord 10 comprises three center strrands 12 and nine outer strands 14.
  • the diameter of the center strands 12 is somewhat larger than the diameter of the outer strands 14 because the filaments 18 of the center strands have a filament diameter that is larger than the filaments 16 of the outer strands.
  • An example is as follows : 3 x 3 x 0.175
  • FIGURE 3 shows a cross-section of another embodiment cord which comprises also three center strands 12 and nine outer strands 14.
  • the center strands 18 have a diameter larger than the diameter of the outer strands 18 by the fact that they consist of three filaments 18 while the outer strands 14 consist only of two filaments 16.
  • the filaments 18 of the center strands and the filaments 16 of the outer strands have an equal diameter.
  • An example is : 3 x 3 x 0.15
  • FIGURE 4 shows a cross-section of a 19x4 multi-strand steel cord 10.
  • the cord comprises one center strand 12, six intermediate strands 20 and twelve outer strands 14.
  • Each of the strands consists of four filaments.
  • the four filaments of the center strand 12 have a diameter that is somewhat larger than the diameter of the filaments of the intermediate strands 20 and outer strands 14.
  • FIGURE 5 shows a cross-section of a 27x2 multi-strand steel cord 10.
  • the cord comprises three center strands 12, nine intermediate strands 20 and fifteen outer strands 14.
  • Each of the strands consists of two filaments.
  • the two filaments 18 of the center strand 12 have a diameter that is somewhat larger than the diameter of the filaments 16 of the intermediate strands 20 and outer strands 14.
  • the multi-strand steel cords according to the invention may be used to replace the common multi-strand steel cords without loss in breaking load or in other mechanical properties.
  • FIGURE 6 illustrates how a 12x3 multi-strand steel cord according to the invention can be made in one single cord making step, thus avoiding the multiple steps of making the individual strands.
  • three individual filaments 16 are drawn from one supply spool 22 or from three separate supply spools 22.
  • the filaments 16 are guided via a reversing pulley 23, over a flyer 24 to a guiding pulley 25.
  • Flyer 24 rotates at a rotational speed n RAD and gives to the filaments 16 two twists per rotation so that a (provisional) strand 14 is made. This is done twelve times simultaneously.
  • the whole set of twelve supply spools 22 and the corresponding flyers 24 form a so-called rotating pay-off installation.
  • the twelve provisional strands are brought together at an assembly point 26 and are guided to a false twister 28 which rotates at twice the rotational speed n B of a downstream double-twister.
  • the function of this false twister 28 is to draw the exact lengths of the strands they need in the final cord since at the level of false twister 28 the cord temporarily reaches its final cord twisting pitch.
  • the assembled strands are led via a guiding pulley 30, over a flyer 32 and a reversing pulley 34 and are eventually wound on a spool 36.
  • Flyer 32 rotates at a rotational speed n B , gives two twists per rotation to the assembled strands and lays down the final cord twisting pitch of multi-strand cord 10 and also (together with rotating flyers 24) the final strand twisting pitch.
  • This second example illustrates an advantageous embodiment of the multi-strand cord according to the invention. If the cord twisting direction and the strand twisting direction are equal, the twists given by the flyers of the rotating pay-off installation are added to the twists given by the flyer of the double-twister so that the final twists are obtained with a minimum of twisting energy (compare the much higher rotational speeds of the first example with the rotational speeds of the second example !).
  • the rotational speed n RAD of the flyers of the rotating pay-off installation is in any way different from the rotational speed n B of the flyer of the double-twister in order to avoid a situation where the twists given by the flyers of the rotating pay-off installation would be hundred per cent compensated by the twists given by the flyer of the double-twister, which would result in steel cords where the difference between the strands would disappear and result in so-called compact steel cords consisting only of filaments having the same cord twisting pitch and cord twisting direction which are equal to the strand twisting pitch and strand twisting direction.

Landscapes

  • Ropes Or Cables (AREA)

Claims (14)

  1. Câblé d'acier (10) comprenant au moins huit torons (12, 14) retordus ensemble, chacun desdits torons ayant à peu près une même direction de torsion de câble, chacun desdits torons consistant en deux à cinq filaments individuels (16, 18) retordus ensemble, caractérisé en ce que chacun desdits torons a à peu près un même pas de torsion de câble dans ledit câble d'acier.
  2. Câblé d'acier selon la revendication 1, dans lequel les filaments individuels de chacun desdits torons, ont été retordus dans une même direction de torsion de toron et avec un même pas de torsion de toron.
  3. Câblé d'acier selon la revendication 1 ou 2, dans lequel le nombre de torons dans le câble d'acier est de 12 : trois torons centraux et neuf torons extérieurs.
  4. Câblé d'acier selon la revendication 3, tous lesdits torons extérieurs ayant à peu près un même diamètre de toron extérieur, et au moins l'un desdits torons centraux ayant un diamètre de toron supérieur au diamètre de toron des torons extérieurs.
  5. Câblé d'acier selon la revendication 4, tous lesdits torons extérieurs comportant des filaments ayant à peu près un même diamètre de filament, ledit au moins un toron central comprenant des filaments ayant un diamètre supérieur au diamètre de filament des filaments des torons extérieurs.
  6. Câblé d'acier selon la revendication 4 ou 5, tous lesdits torons extérieurs comportant un même nombre de filaments, ou ledit au moins un toron central comprenant plus de filaments que les torons extérieurs.
  7. Câblé d'acier selon la revendication 1 ou 2, dans lequel le nombre de torons dans le câble d'acier est de dix-neuf, un toron central, six torons intermédiaires et douze torons extérieurs.
  8. Câblé d'acier selon la revendication 7, tous lesdits torons intermédiaires ayant à peu près un même diamètre et tout lesdits torons extérieurs ayant à peu près un même diamètre, le toron central ayant un diamètre supérieur au diamètre des torons intermédiaires, et supérieur au diamètre des torons extérieurs.
  9. Câblé d'acier selon la revendication 1 ou 2, dans lequel le nombre de torons dans le câble d'acier est de vingt-sept, trois torons centraux, neuf torons intermédiaires et quinze torons extérieurs.
  10. Câblé d'acier selon la revendication 9, tous lesdits torons intermédiaires ayant à peu près un même diamètre et tous lesdits torons extérieurs ayant à peu près un même diamètre, au moins l'un desdits torons centraux ayant un diamètre supérieur au diamètre des torons intermédiaires, et supérieur au diamètre des torons extérieurs.
  11. Câblé d'acier selon l'une quelconque des revendications 2 à 10, dans lequel ladite direction de torsion de câble est la même que ladite direction de portion de toron.
  12. Câblé d'acier selon l'une quelconque des revendications 2 à 10, dans lequel ladite direction de torsion de câble est opposée à ladite direction de torsion de toron.
  13. Câblé d'acier selon l'une quelconque des revendications 2 à 12, dans lequel ledit pas de torsion de câble est à peu près égal.
  14. Câblé d'acier selon l'une quelconque des revendications 2 à 12, dans lequel ledit pas de torsion de câble est différent dudit pas de torsion de toron.
EP19960202786 1995-10-27 1996-10-07 Câble d'acier à plusieurs torons Expired - Lifetime EP0770726B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19960202786 EP0770726B1 (fr) 1995-10-27 1996-10-07 Câble d'acier à plusieurs torons

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95202911 1995-10-27
EP95202911 1995-10-27
EP19960202786 EP0770726B1 (fr) 1995-10-27 1996-10-07 Câble d'acier à plusieurs torons

Publications (2)

Publication Number Publication Date
EP0770726A1 EP0770726A1 (fr) 1997-05-02
EP0770726B1 true EP0770726B1 (fr) 2000-12-06

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ID=26139745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960202786 Expired - Lifetime EP0770726B1 (fr) 1995-10-27 1996-10-07 Câble d'acier à plusieurs torons

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EP (1) EP0770726B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3090496A3 (fr) * 2018-12-19 2020-06-26 Michelin & Cie Procédé de fabrication d’un câble multi-torons à deux couches
FR3090495A3 (fr) * 2018-12-19 2020-06-26 Michelin & Cie Procédé de fabrication d’un câble multi-torons à deux couches

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE426853A (fr) * 1937-03-11
FR997343A (fr) * 1945-07-13 1952-01-04 Dunlop Sa Perfectionnements aux câbles applicables notamment aux enveloppes de bandages pneumatiques
FR2001714A1 (fr) * 1968-02-12 1969-10-03 Pirelli
JP2659072B2 (ja) * 1988-12-16 1997-09-30 住友電気工業株式会社 ゴム補強用スチールコード

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EP0770726A1 (fr) 1997-05-02

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