• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The method allows the fabrication of a multi-conductor cable (46) of 1xN structure comprising a single layer (48) of N strands (50) helically wound. Each strand (50) includes an inner layer (52) of M inner wires (54) and an outer layer (56) of P outer wires (58). The method comprises: - an individual assembly step of each of the N strands (50) during which, and in chronological order: - the M internal wires (54) are wound, - the external P wires are wound ( 58), and the inner threads (54) and the outer threads (58) are elongated so that each outer thread (58) has an elongation length greater than an elongation length of each inner thread. (54), a collective assembly step N strands (50) during which the N strands (50) are wound to form the cable (46).
    公开号:FR3032978A1
    申请号:FR1551378
    申请日:2015-02-19
    公开日:2016-08-26
    发明作者:Natacha Pironneau；Emmanuel Clement；Thibault Rapenne；Eric Colin；Pascal Chavarot
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] The invention relates to a method of manufacturing a multistrand cable, a multistrand cable that can be obtained by this method and a tire comprising this cable. [2] There is known from the state of the art a tire for civil engineering vehicle with a radial carcass reinforcement comprising a tread, two inextensible beads, two flanks connecting the beads to the tread and a crown reinforcement, disposed circumferentially between the carcass reinforcement and the tread. This crown reinforcement comprises several layers of rubber, possibly reinforced by reinforcing elements such as metal cables. [3] The crown reinforcement comprises a work frame, a protective frame and possibly other frames, for example a hooping frame. [4] The protective armor comprises one or more protection plies comprising a plurality of protective reinforcing elements at an angle of between 15 ° and 30 ° to the circumferential direction of the tire. Generally, each protective reinforcement element is a cable comprising several metal single wires. [5] Document W02011 / 134900 discloses a cable for reinforcing such protective plies. The cable is of the multitoron type and has a 1xN structure. The cable comprises a single layer of N = 4 strands wound helically. Each strand comprises, on the one hand, an inner layer of M = 4 internal wires helically wound and an outer layer of P = 9 outer wires wound helically around the inner layer. [006] The cable manufacturing method comprises a first step of individual assembly of each of the N strands and a second step of collective assembly of N strands during which the N strands are helically wound to form the cable. Then, during a subsequent calendering step, is simultaneously coated several cables on either side by two strips of rubber thus forming a protective layer. [007] However, during the second step of collective assembly of N strands, it was noted that some of the M internal son radially out between the outer son. This output of internal wires is present when there are gaps between the P son of the outer layer, but also when there are no gaps between the P son of the outer layer. Thus, the cable has a variable diameter, the latter being higher at the locations where the internal wire outlets are located. Such a variation of diameter is particularly problematic during the passage of the cable in the cable manufacturing tools, especially in the calendering step. One solution for avoiding such diameter variations is to insulate the portion of the cable having the output of internal wires, cut it and then abut the two resulting ends of the cable cutting. However, external wire outputs appearing at a frequency of the order of the assembly step of the collective assembly step (every 15 mm in the case of W02011 / 134900 cable), such a solution is industrially unthinkable . [8] The object of the invention is to enable the manufacture of a cable devoid of or almost free of internal wires radially outgoing between the outer wires. [9] For this purpose, the subject of the invention is a method of manufacturing a multi-structure cable of 1xN structure comprising a single layer of N helically wound strands, each strand comprising: an inner layer of M internal helically wound wires An outer layer of P external yarns wound helically around the inner layer, the method comprising: an individual assembly step of each of the N strands in which, and in chronological order: helically winds the inner threads to form the inner layer, the outer threads P are wound helically around the inner layer, and the inner and outer threads are elongated so that each outer thread has length of elongation greater than an elongation length of each M inner wire, - a collective assembly step of N strands during which the N strands are helically wound to form the cable. [010] With the method according to the invention, the cable is devoid or virtually devoid of radial output of internal son between the outer son. Indeed, the inventors at the origin of the invention have demonstrated that during the step 30 of collective assembly of N strands during which the N strands are helically wound to form the cable, the internal wires were placed in radial compression by external wires. This compression, generated by a shortening of the pitch of the outer threads greater than the shortening of the pitch of the internal threads during the collective assembly step N strands, had, in the state of the art, the effect of 35 radially out the internal wires between the outer wires. P10-3546_EN 3032978 - 3 - [11] In the invention, the elongation of the M internal wires and P external wires is due to the plastic deformation of each wire. The inventors at the origin of the invention have discovered that by lengthening the outer P-wires more than the internal threads M during the individual assembly step of each of the N strands, compression of the wires is avoided. during the collective assembly stage of the N strands. Indeed, the elongation length of the external P-wires makes it possible to give an over-length to the external wires with respect to the internal wires. This over-length makes it possible, during the collective assembly step N strands, to ensure that even if the shortening of the steps is different between the inner and outer layers, the internal threads 10 are not put in compression by the external wires. [12] The length of elongation is the difference between the length of each wire after and before the step of elongation of the wire. [13] According to a preferred embodiment, the inner and outer threads M are elongated by imposing an additional twist on each strand after the helical winding of the outer P-wires around the inner layer. [14] The additional twist is the twist imposed on each strand after the winding step of the outer P-wires. Thus, after this additional twist, each strand has a final twist equal to the sum of the initial torsion imposed by the assembly of the inner and outer layers and the additional torsion. [015] Preferably, the additional torsion is imposed on each strand by means of a member mounted to rotate about an axis of rotation substantially parallel to the direction of travel of each strand in the member. [016] More preferably, the rotatably mounted member comprises at least one pulley around at least a portion of which is scrolled each strand. [017] Still more preferably, Method according to the preceding claim, wherein the rotatably mounted member comprises at least two pulleys, each next strand in the member, a path defining at least one loop around at least one one of the pulleys. [018] In an advantageous embodiment, during the individual assembly step 30 of each of the N strands, a tensile stress is applied to the inner layer and a tension in tension to the outer layer. tension tension applied to the inner layer being greater than or equal to the tension tension applied to the outer layer.
    [0002] 35 P10-3546_EN 3032978 - 4 - [19] The tensile stresses applied to the inner and outer layers allow elastically deforming each inner and outer wire. Thus, during the individual assembly step of each of the N strands, the inner wires are brought closer to each other so as to make the inner layer more compact. Thus, the aeration of the inner layer is reduced. Therefore, the radial outlets of the internal wires between the outer wires are reduced. [20] Another object of the invention is a 1xN multi-structure cable obtainable by a method as defined above. [21] As described above, the cable according to the invention is devoid of or almost devoid of radial output of internal wires on each strand. By lacking or virtually devoid of radial output, it is meant that each strand comprises at most 10 radial outputs of internal threads per meter of strand, preferably at most 5 radial outputs of internal threads per meter of strand and more preferably 2 radial outputs of strands internals per meter of strand. [022] A radial output of an inner wire corresponds to an inner wire extending radially at least partly radially outside the theoretical circle in which the internal wires should be inscribed. Thus, a radial output can take place when an inner wire is interposed in part or totally in the outer layer. A radial output may also occur when an inner wire extends at least partly outside the theoretical circle in which the outer wires are inscribed. [23] Advantageously, N = 3 or N = 4, preferably N = 4. [24] Advantageously, M = 3, 4 or 5, preferably M = 3. [25] Advantageously, P = 7, 8, 9, 10 or 11, preferably P = 8. [26] Preferably, the outer layer of each strand is non-compact. [027] By definition, a non-compact layer is such that there are gaps between the layers of the layer. [28] Preferably, the outer layer of each strand is unsaturated. [29] By definition, an unsaturated layer of yarns is such that there is sufficient space in this layer to add at least one (X + 1) th yarn of the same diameter as the X yarns of the layer, several yarns. can then be in contact with each other. Conversely, this layer is said to be saturated if there is not enough space in this layer to add at least one (X + 1) th thread of the same diameter as the N son of the layer. [30] Thus, the cable according to the invention is particularly advantageous because it does not have radial outputs of internal son while the outer layer being unsaturated, the latter would be facilitated unlike a cable whose layer P10-3546_EN 3032978 - 5 - external of each strand would be saturated. The unsaturated outer layer thus makes it possible to obtain excellent penetrability of the rubber in each strand without it having no or almost no radial output of internal wires. [31] Advantageously, the inner threads M being helically wound at pitch p1, pl ranges from 3 to 11 mm, preferably from 5 to 9 mm. [32] Advantageously, the outer P-wires being helically wound at pitch p2, p2 is 6 to 14 mm, preferably 8 to 12 mm. [33] Advantageously, the N strands being helically wound at pitch p3, p3 is from 10 to 30 mm, preferably from 15 to 25 mm. [034] The values of the steps p1, p2 and p3 may be adapted by those skilled in the art in order to obtain the desired characteristics for the cable. Depending on the values chosen, a person skilled in the art will be able to determine the value of the elongation of the external P-wires to prevent the radial output of the latter. [35] Preferably, the diameter of the internal and / or external wires is from 0.12 mm to 0.50 mm, preferably from 0.25 mm to 0.45 mm and more preferably from 0.30 to 0, 40 mm. [36] In one embodiment, each strand consists of the inner layer and the outer layer. Thus, each strand is of the two-layer type. [37] The invention further relates to a tire for a civil engineering vehicle comprising a multistrand cable as described above. [38] Preferably, the tire comprises a tread and a crown reinforcement arranged radially inside the tread, the crown reinforcement comprising: - a protective reinforcement comprising at least one reinforcing element, said protection device, comprising a multistrand cable as described above; and a working armature arranged radially inside the protective armature. [39] In one embodiment, the protective armature is interposed radially between the tread and the armature. [40] Advantageously, the protective armor comprising at least one protective ply 30 comprising one or more protective reinforcing elements, the protective reinforcing element or elements forming an angle of at least 10 °, preferably ranging from 10 ° to 35 ° and more preferably 15 ° to 30 ° with the circumferential direction of the tire. [41] In one embodiment, the work reinforcement comprising at least one working ply comprising reinforcing elements, referred to as working elements, the working reinforcing elements make an angle at most equal to 60 °, preferably from 15 ° to 40 ° P10-3546_EN 3032978 - 6 - with the circumferential direction of the tire. [42] Advantageously, the crown reinforcement comprises a hooping reinforcement comprising at least one hooping sheet. [43] In one embodiment, each shrink web comprising reinforcing elements, called shrinking elements, the hooping reinforcing elements make an angle at most equal to 10 °, preferably ranging from 5 ° to 10 ° with the circumferential direction of the tire. [44] Preferably, the hooping frame is arranged radially inside the working frame. [045] Advantageously, the tire comprising a carcass reinforcement comprising at least one carcass ply comprising carcass reinforcement elements, the carcass reinforcement elements make an angle greater than or equal to 65 °, preferably 80 ° C. ° with respect to the circumferential direction of the tire. [46] In one embodiment, the tire has a WR U-type dimension with lik35, preferably Uk49 and more preferably lik57. This designation of the tire size is in accordance with the ETRTO nomenclature ("European Tire and Rim Technical Organization"). [47] Preferably, the M internal threads and the P external threads are metallic. By metal, is meant by definition a unitary wire consisting, in mass, majority (that is to say for more than 50% of these son) or integrally (for 100% son) of a metallic material, by example of steel. By metallic unit wire, is meant by definition a monofilament consisting predominantly (that is to say for more than 50% of its mass) or integrally (for 100% of its mass) of a metallic material. Each monofilament is preferably made of steel, more preferably of pearlitic (or ferrito-pearlitic) carbon steel, hereinafter referred to as "carbon steel", or else of stainless steel (by definition, steel comprising at least 11% of chromium and at least 50% iron). [48] When carbon steel is used, its carbon content (% by weight of steel) is preferably between 0.5% and 0.9%. It is preferable to use a steel of the steel cord type with normal resistance (called "NT" for "Normal Tensile") or with high resistance (called "HT" for "High Tensile") whose tensile strength (Rm) is preferably greater than 2000 MPa, more preferably greater than 2500 MPa and less than 3000 MPa (measurement carried out in traction according to the ISO 6892-1 standard of 2009. [049] In the present application, any range of values designated by the expression "Between a and b" represents the range of values from more than a to less than (b) (i.e., terminals a and b excluded) while any range of values designated by "expression" from a to b "means the range of values from the" a "terminal to the" b "terminal, that is to say including the strict" a "and" b "terminals. [050] The invention will be better understood on reading the description which will follow, given solely by way of nonlimited example. tative and made with reference to the drawings in which: - Figure 1 is a simplified sectional view of a tire according to the invention; FIG. 2 is a detailed view of part I of the tire of FIG. 1; Figure 3 is a schematic sectional view perpendicular to the axis of the cable 10 (assumed rectilinear and at rest) of a cable according to a first embodiment of the invention; Figure 4 is a schematic sectional view perpendicular to the axis of the cable (assumed rectilinear and at rest) of a cable according to a second embodiment of the invention; FIGS. 5 and 6 are diagrammatic views of an installation making it possible to implement the method according to the invention; FIG. 7 is a schematic view of an element of the installation of FIG. 5; and FIG. 8 is a graph illustrating the force-elongation curves of a strand 20 of one of the cables according to the invention of FIGS. 3 and 4 and of a strand of the state of the art. [51] EXAMPLE OF PNEUMATIC TIRES AND CABLES ACCORDING TO THE INVENTION [52] In the figures, there is shown a reference X, Y, Z respectively corresponding to the usual axial, radial and circumferential orientations of a tire. [53] FIGS. 1 and 2 show a vehicle tire of the civil engineering type, for example of the "dumper" type, and designated by the general reference 10. Thus, the tire 10 has a WRU-type dimension, for example example 40.00 30 R 57 or else 59/80 R 63. [54] In a manner known to those skilled in the art, W, denotes: when it is in the H / B form, the nominal aspect ratio H / B as defined by ETRTO (H being the height of the section of the tire and B being the width of the tire section) - when it is in the form H.00 or B.00, where H = B, H and B being as defined above. U represents the diameter, in inches, of the seat of the rim on which the tire is intended to be mounted, R denotes the type of carcass reinforcement of the tire, here radial. We have lik35, preferably Uk49 and more preferably lik57. [55] The tire 10 has a top 12 reinforced by a crown reinforcement 14, two sidewalls 16 and two beads 18, each of these beads 18 being reinforced with a rod 20. The top 12 is surmounted by a tread 22. The crown reinforcement 14 is arranged radially inside the tread 22. A carcass reinforcement 24, arranged radially inside the crown reinforcement 14, is anchored in each bead 18, here 10 wrapped around each rod 20 and comprises an upturn 26 disposed towards the outside of the tire 10 which is shown here mounted on a rim 28. [56] The carcass reinforcement 24 comprises at least one carcass ply 30 comprising elements reinforcement, called carcass (not shown). The carcass reinforcement elements are at an angle greater than or equal to 65 °, preferably 80 ° with respect to the circumferential direction Z of the tire 10. Examples of such carcass reinforcement elements are described in EP0602733 or else still EP0383716. [57] The tire 10 also comprises a sealing ply 32 made of an elastomer, for example butyl (commonly called "inner rubber") which defines the radially inner face 34 of the tire 10 and which is intended to protect the carcass ply 30 of the air diffusion coming from the interior of the tire 10. [58] The crown reinforcement 14 comprises, radially from the outside towards the inside of the tire 10, a protective reinforcement 36 arranged radially inside the tread 22, a working armature 38 arranged radially inside the protective armature 36 and a shrinking armature 39 arranged radially inside the armature 38. Thus, the protective reinforcement 36 is interposed radially between the tread 22 and the working reinforcement 38. [59] The protective reinforcement 36 comprises first and second protective plies 42, 44, first na protection pin 42 being arranged radially inside the second protective ply 44. The first and second protective plies 42, 44 comprise so-called protective reinforcing elements (not shown). [60] The protective reinforcement elements are arranged side by side parallel to each other in a main direction substantially perpendicular to the general direction in which these reinforcing elements extend. The protective reinforcement elements are crossed from one protective ply 42, 44 to the other. Each protective reinforcement element, here the general direction in which these reinforcing elements extend, makes an angle at least equal to 10 °, preferably ranging from 10 ° to 35 ° and more preferably from 15 ° to 30 ° with the circumferential direction Z of the tire 10. Here, the angle is equal to 24 °. [061] With reference to FIG. 3, each protective reinforcement element comprises a multi-structure cable 46 of structure 1xN. The cable 46 comprises a single layer 48 of N strands 50 helically wound in a pitch p3. The N strands 50 are wound in either a Z or S direction. Each strand 50 comprises an inner layer 52 of M internal wires 54 helically wound in a pitch p1 and an outer layer 56 of P external wires 58 wound helically. around the inner layer 52 in a step p2. In this case, each strand 50 consists of the inner layer 52 and the outer layer 56. Each strand 50 is thus devoid of hoop wire. [063] Each inner and outer wire 54 has a diameter of from 0.12 mm to 0.50 mm, preferably from 0.25 mm to 0.45 mm and more preferably from 0.30 to 0.40 mm. and here equal to 0.35 mm. Each inner wire 54 and outer 58 is metallic, here steel grade HT ("High Tensile") with a breaking strength equal to 2765 MPa. Other steel grades can of course be used. In other embodiments, the diameter of the inner wires 54 may be different from the diameter of the outer wires 58. [64] The outer layer 56 of each strand 50 is non-compact and unsaturated. [65] The pitch of the winding pl M inner son 54 is from 3 to 11 mm, preferably from 5 to 9 mm and is here equal to 6.7 mm. The pitch P2 of winding of the outer wires 58 is from 6 to 14 mm, preferably from 8 to 12 mm and is here equal to 10 mm. Finally, the pitch p 3 of winding N strands 50 is 10 to 30 mm, preferably 15 to 25 mm and is here equal to 20 mm. [66] The inner wires 54, the outer wires 58 and the N strands are wound in the same direction, Z or S. Preferably, the N strands 50, the inner wires 54 and the outer wires 58 are all wound in the Same direction. [67] In the first embodiment illustrated in FIG. 3, N = 3 or N = 4, and here N = 4. We also have M = 3, 4 or 5 and here M = 3. We finally have P = 7, 8, 9, 10 or 11 and here P = 8. [68] In the second embodiment of the cable 46 illustrated in FIG. 4, there are 35 N = 3, M = 3 and P = 8. P10-3546_EN 3032978 -10- [69] Returning to FIG. 2, the working armature 38 comprises first and second working plies 60, 62, the first working ply 60 being arranged radially inside the second working ply 62. The first and second working plies 60, 62 comprise reinforcement elements, called working elements (not shown). [70] The reinforcing elements are arranged side by side parallel to each other in a main direction substantially perpendicular to the general direction in which these reinforcing elements extend. The reinforcing elements are crossed from a working ply 60, 62 to the other. Each reinforcing element 10, here the general direction in which these reinforcing elements extend, makes an angle at most equal to 60 °, preferably ranging from 15 ° to 40 ° with the circumferential direction Z of the tire 10. Here, the angle of the reinforcing elements of the first working ply is equal to 19 ° and the angle of the reinforcement elements of the second working ply is equal to 33 °. [071] Examples of such reinforcing elements are described in EP0602733 or EP0383716. [72] The hoop reinforcement 39, also called limiter block, whose function is to partially recover the mechanical stresses of inflation, comprises first and second hooping plies 64, 66, the first hooping sheet 64 being arranged radially inside the second shrink web 66. [73] Each shrink web 64, 66 comprises reinforcing metal reinforcing elements (not shown), for example metal cables as described in FR 2 419 181 or FR 2 419 182 and making an angle at most equal to 10 °, preferably ranging from 5 ° to 10 ° with the circumferential direction Z of the tire 10. Here the angle is equal to 8 °. The hoop reinforcing elements are crossed from one hooping web 64, 66 to the other. [74] EXAMPLE OF A PROCESS FOR MANUFACTURING A MULTITORON CABLE IN ACCORDANCE WITH THE INVENTION [075] FIGS. 5, 6 and 7 illustrate an installation 68 making it possible to manufacture the cable 46 as described above. [076] The installation 68 comprises an installation 70 for manufacturing each strand 50 shown in FIG. 5 and an installation 72 for assembling the strands 50 shown in FIG. 6.
    [0003] It will be recalled that there are two possible techniques for assembling metal wires: either by wiring: in such a case, the wires do not undergo torsion around their own axis, because synchronous rotation before and after the point of assembly; - By twisting: in such a case, the son undergo both a collective twist and an individual twist around their own axis, which generates a torque of detorsion on each of the son and the strand or the cable itself . [78] The manufacturing installation 70 of each strand 50 comprises, upstream to downstream 10 in the direction of travel of the strand 50, means 74 for supplying the M internal wires 54, means 76 for assembling the M internal wires 54, means 77 for rotating the M inner wires assembled, means 78 for supplying P external wires 58, means 80 for assembling P external wires 58 around the inner layer 52, means 81 each of the strands 50, means 82 for lengthening the P external wires, means 83 for pulling the strand 50 and means 84 for storing the strand 50. [79] The installation 72 for assembling the strands 50. strands 50 comprises, from upstream to downstream, in the direction of travel of the cable 46, feed means 86 of N strands 50, means 88 for assembling N strands 50 together, means 89 for rotating cable 46, means 90 for pulling cable 46 and means 91 for storing cable 46. [80] Referring to FIG. 5, the feed means 74 of the internal threads M 54 comprise unwinding rolls 92 of each inner thread 54. The assembly means 76 of the inner threads M include a tundish 94 and an assembly thread 96. defining an assembly point P1. The rotation means 77 comprise two flywheels 97 arranged downstream of the assembly point P1. So we talk about rotating food. [81] The supply means 78 of the external P-wires 58 comprise unwinding coils 98 of each outer wire 58. The connecting means 80 of the outer P-wires comprise a splitter 100 and an assembly spline 102. defining an assembly point P2. The rotating means 81 comprise two flywheels 103 arranged downstream of the assembly point P2. We therefore speak of rotating reception. [82] With reference to FIG. 7, the elongation means 82 of the external P-wires 35 comprise a member 104 mounted to rotate about an axis of rotation X substantially parallel to the direction D of travel of each strand 50 in P10. The member 104. The rotatably mounted member 104 comprises at least one pulley 106 around at least a portion of which each strand 50 is scrolled. In this case, the rotatably mounted member 104 comprises several pulleys, here two pulleys 106. In the member 104, each strand 50 follows a path defining at least one loop around at least one of the pulleys 106. Here, each strand follows a path defining an "8" lying down and is wrapped around each pulley 106. Here, the member 104 is a two-pulley twister. [083] The means 83 for pulling each strand 50 comprise one or more capstans 108 and the means 84 for storing each strand 50 comprise a coil 110 for winding each strand 50. [084] Each strand 50 is assembled here by twisting. [085] With reference to FIG. 6, the supply means 86 of the N strands 50 comprise unwinding coils 112 of each strand 50. The means 88 for assembling the N strands 50 together comprise a distributor 114 as well as a assembly pin 116 defining an assembly point P3. The means 89 for rotating the cable 46 comprise two flywheels 118 arranged downstream of the assembly point P3. The means 90 for pulling the cable 46 comprise one or more capstans 120 and the means 91 for storing the cable 46 comprise a coil 122 for winding the cable 46. [086] A method of manufacturing the cable 46 used will now be described. implemented by means of the installation 68 described above. [87] The process comprises two assembly steps. The first step is an individual assembly step of each of the N strands 50 implemented by means of the installation 70. The second step is a collective assembly step N 25 strands 50 implemented by means of the Installation 72. [88] In the first step of individual assembly by twisting, the inner threads 54 are wound at a pitch p1 in a helix to form the inner layer 52. Here p1 '= 10 mm. [89] Then, again in this first step of individual twisting, the outer P-wires 58 are wrapped around the inner layer 52 at a pitch p2 ', in a helix. Here, p2' = 20 mm. [90] Then, again in this first individual assembly step, the inner threads 54 and outer threads 58 are lengthened so that each outer thread 58 has an elongation length greater than an elongation length of Each inner wire 54. The inner threads 54 and outer threads 58 are elongated 58 by plastic deformation by means 82. In this case, the inner threads 54 and the inner threads 54 are elongated. P external son 58 by plastic deformation by imposing an additional twist to each strand 50 after the helical winding P external son 58 around the inner layer 52. Then, each strand 50 thus obtained is stored on the storage means 84. The additional torsion is imposed by adjusting the value of the rotational speed of the rotating member 104 around the X axis. The skilled person will be able to find the value of this rotational speed as a function of the lengths of elongation desired. . [91] During the individual assembly step of each of the N strands 50, a tensile tension T1 is applied to the inner layer 52. During this step 10 of individual assembly of each of the N strands 50, it is applied also a tensile tension T2 to the outer layer 56. The tension tension T1 applied to the inner layer 52 is greater than the tensile tension T2 applied to the outer layer 56. [92] During the second assembly step collective N strands 50, is wound in a helix, at pitch p3, N strands 50 to form the cable pitch p3 as shown in Figure 6. [93] COMPARATIVE TESTS [94] We compared below a cable of the state of the art CO and two cables 46 and 47 according to the invention. The characteristics of these cables CO, 46 and 47 are summarized in Table 1 below. [95] The CO cable was manufactured according to a method according to the state of the art, that is to say without a step of elongation of the M internal wires and P external wires. The method of the state of the art is associated with the reference "1". [096] The cables 46 and 47 according to the invention were manufactured using a method according to the invention. The cable 46 is obtained by implementing the method according to the invention described above which is associated with the reference "2". The cable 47 is obtained by implementing a method according to the invention, which is associated with the reference "3", in which during the individual assembly step of each of the N 30 strands, the same voltage is applied. traction to the inner layer and the outer layer. [097] The measure of force at break noted Fm (maximum load in N) is performed in traction according to the standard ISO 6892-1 of October 2009 on cables directly from the manufacturing process. [098] The number of internal wire outlets per meter of Ns strand was measured by disassembling the tested cable and counting, for each strand, the number of internal wire outlets. Thus, for N strands, we obtain a total number of internal wire outlets per meter of cable. Dividing this total number by N gives the number Ns of internal wire outlets per meter of strand. [099] The number of internal wire buckling observed by 5 meter of strand Nf was also measured in a similar manner. A buckling corresponds to an abnormally large curvature of a wire without this constituting a radial output. Cable Structure Process Grade steel pl p2 p3 Fm Ns Nf (mm) (mm) (mm) (N) m-1 m 1) CO 4x (3 + 8) x0.35 1 HT 6,7 10 20 9173 20> 20 46 4x (3 + 8) x0.35 2 HT 6.7 10 20 9612 0 2 47 4x (3 + 8) x0.35 3 HT 6.7 10 20 9495 0 4 10 Table 1 [0100] Being lacking or almost lacking internal wire outputs, the cables 46 and 47 do not have a variable diameter. This avoids all the problems related to this variation of the cable diameter which makes it less tedious its manufacture and reduces its cost. It will be noted that, during the individual assembly step of each of the N strands (cable 46, method 2), a tension tension is applied to the inner layer greater than the tension tension applied. to the outer layer further reduces the number of internal wire burrs relative to a method comprising an assembly step during which the tensile tension applied to the inner layer is equal to the tensile tension applied to the outer layer (Cable 47, Method 3). FIG. 8 shows the force-elongation curve I of a strand (3 + 8) x0.35 of the cable CO and the force-elongation curve II of a strand of the cable 46. Each of these curves represents the variation of the elongation A (in%, in abscissa) as a function of the force F (in Newton, in the ordinate) that is imposed on it. Note that the curve I comprises two parts. The first part corresponds to the approximation of the internal threads of each other. The second part corresponds on the one hand to a rapprochement of the outer son of each other and on the other hand to the elastic elongation of the internal and external son. Curve II has three parts. In a similar way to the curve I, the first part corresponds to the approximation of the internal threads of each other. The second part corresponds to the approximation of the outer wires of each other. P10-3546_EN 3032978 -15- It is noted that, given the over-length applied to external wires, this second part makes it possible to obtain a strand having much more elongation than the strand of curve I. Finally, the third part corresponds to the elastic elongation of the internal and external wires. In addition, it is noted that identical structure, the cables 46 and 47 allow a gain of 5% in breaking force relative to the CO cable. A posteriori, the inventors at the origin of the invention discovered that, on the one hand, in the CO cable, the internal wires coming out between the outer wires rubbed between these, which caused a drop in the breaking force. cable. On the other hand, the inventors postulate, a posteriori, the hypothesis according to which, the internal wires having no over-length in the cable according to the invention, the latter contribute, during a tensioning of the cable , at the same time as the external wires to the mechanical strength of the cable. On the contrary, in the cable of the state of the art, the internal wires having an over-length, they do not participate, during a tensioning of the cable, at the same time as the external son resistance mechanical cable, which reduces the breaking strength of the cable of the state of the art with respect to the cable of the invention. The invention is not limited to the embodiments described above. Indeed, each strand may also comprise an intermediate layer 20, interposed between the inner layer and the outer layer, the son of the intermediate layer being wound helically around the inner layer and the outer layer of son being wound helically around the middle layer. In this embodiment, the cable consists of the inner layer, the intermediate layer and the outer layer. P10-3546_FR
    权利要求:
    Claims (15)
    [0001]
    REVENDICATIONS1. A method of manufacturing a multistrand cable (46) of 1xN structure comprising a single layer (48) of N helically wound strands (50), each strand (50) comprising: - an inner layer (52) of M internal wires ( 54) helically wound, - an outer layer (56) of P external wires (58) wound helically around the inner layer (52), the method being characterized in that it comprises: - an individual assembly step of each of the N strands (50) during which, and in chronological order: - the inner threads (54) are helically wound to form the inner layer (52), - the external P-wires are wound in a helix (58) around the inner layer (52), and - the inner threads (54) and outer threads (58) are lengthened so that each outer thread (58) has an elongation length greater than one length of elongation of each M inner wire (54), - a collective assembly step N strands (50) during which is wound in propeller the N strands (50) to form the cable (46).
    [0002]
    2. Method according to the preceding claim, wherein the M inner son (54) and the P external son (58) are extended by imposing an additional twist on each strand (50) after the helical winding of the P external wires (58). around the inner layer (52).
    [0003]
    3. Method according to the preceding claim, wherein the additional torsion is imposed on each strand (50) by means of a member (104) rotatably mounted about an axis of rotation (X) substantially parallel to the direction (D). scrolling each strand (50) in the member (104).
    [0004]
    4. Method according to the preceding claim, wherein the rotatably mounted member (104) comprises at least one pulley (106) around at least a portion of which is scrolled each strand (50).
    [0005]
    5. Method according to the preceding claim, wherein the rotatably mounted member (104) comprises at least two pulleys (106), each strand (50) following in the member (104), a path defining at least one loop around at least one of the pulleys (106). P10-3546_EN 3032978 -17-
    [0006]
    6. Method according to any one of the preceding claims, wherein, during the individual assembly step of each of the N strands (50), is applied: - a tension in tension to the inner layer (52) and - a tensile stress to the outer layer (56), the tensile tension applied to the inner layer (52) being greater than the tension tension applied to the outer layer (56).
    [0007]
    7. Multitone cable (46) 1xN structure, characterized in that it is obtainable by a method according to any one of the preceding claims. 10
    [0008]
    The multistrand cable (46) according to claim 7, wherein N = 3 or N = 4, preferably N = 4.
    [0009]
    9. Multitone cable (46) according to claim 7 or 8, wherein M = 3, 4 or 5, preferably M = 3.
    [0010]
    The multistrand cable (46) according to any one of claims 7 to 9, wherein P = 7, 8, 9, 10 or 11, preferably P = 8.
    [0011]
    The multistrand cable (46) according to any one of claims 7 to 10, wherein the outer layer (56) of each strand (50) is non-compact.
    [0012]
    The multistrand cable (46) according to any one of claims 7 to 11, wherein, the M inner wires (54) being helically wound at pitch p1, pl is from 3 to 11 mm, preferably from 5 to 10 mm. 9 mm.
    [0013]
    13. multistrand cable (46) according to any one of claims 7 to 12, wherein, the P external son (58) being helically wound at pitch p2, p2 ranges from 6 to 14 mm, preferably from 8 to 12 mm.
    [0014]
    The multistrand cable (46) according to any one of claims 7 to 13, wherein, the N strands (50) being helically wound at pitch p3, p3 is 10 to 30 mm, preferably 15 to 25 mm.
    [0015]
    15. Pneumatic tire (10) for civil engineering vehicle, characterized in that it comprises a multistrand cable (46) according to any one of claims 7 to 14. P10-3546_EN
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    同族专利:
    公开号 | 公开日
    EP3259400B1|2021-07-07|
    CN107580642B|2020-10-09|
    CN107580642A|2018-01-12|
    US10704195B2|2020-07-07|
    JP6762309B2|2020-09-30|
    EP3259400A1|2017-12-27|
    US20180010294A1|2018-01-11|
    KR20170118081A|2017-10-24|
    JP2018506659A|2018-03-08|
    WO2016131862A1|2016-08-25|
    FR3032978B1|2017-10-27|
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    法律状态:
    2016-02-18| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-26| PLSC| Search report ready|Effective date: 20160826 |
    2017-02-17| PLFP| Fee payment|Year of fee payment: 3 |
    2018-02-23| PLFP| Fee payment|Year of fee payment: 4 |
    2019-10-25| ST| Notification of lapse|Effective date: 20191006 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1551378A|FR3032978B1|2015-02-19|2015-02-19|MULTITORON 1XN STRUCTURE CABLE FOR PNEUMATIC PROTECTION FRAME|FR1551378A| FR3032978B1|2015-02-19|2015-02-19|MULTITORON 1XN STRUCTURE CABLE FOR PNEUMATIC PROTECTION FRAME|
    US15/546,468| US10704195B2|2015-02-19|2016-02-17|Multi-strand cable of 1×N structure for protective reinforcement of a tire|
    JP2017543980A| JP6762309B2|2015-02-19|2016-02-17|1xN multi-strand cable for tire protection reinforcement|
    EP16705143.2A| EP3259400B1|2015-02-19|2016-02-17|Multi-strand cable of 1xn structure for protective reinforcement of a tire|
    PCT/EP2016/053347| WO2016131862A1|2015-02-19|2016-02-17|Multi-strand cable of 1xn structure for protective reinforcement of a tire|
    CN201680011171.1A| CN107580642B|2015-02-19|2016-02-17|Method for manufacturing a multi-strand cable of 1xN construction and product obtained by said method|
    KR1020177022762A| KR20170118081A|2015-02-19|2016-02-17|Multi-strand cable with 1 × N structure for protective reinforcement of tires|
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