A method for preparing a lightweight cable-type bead with improved performance

Abstract

This invention relates to the field of tire carcass materials and proposes a method for preparing a lightweight cable-type tire bead with improved performance. The steps are as follows: adjusting the yield strength ratio of the metal outer winding to 75-90%; adjusting the self-forming bead diameter D of the non-metallic outer winding and the metal outer winding. x , making D x With cable-type tire bead inner diameter D c The ratios are all: 0.5 ≤ D x / D c ≤1.0; Set the ratio of the winding twist L to the cross-sectional diameter D of the cable-type bead to: 10≤L / D≤35; The adjusted metal and non-metal outer winding wires are spirally wound onto the core ring according to the twist L. In summary, this invention, by adjusting the yield strength ratio and self-forming loop diameter of the metal outer winding wire, adjusting the self-forming loop diameter of the non-metal outer winding wire, and the twist pitch of the non-metal or metal outer winding wires, reduces the weight of the lightweight cable-type bead by 15-60%, while maintaining strength, formability, and stiffness comparable to conventional cable-type bead.

Description

Technical Field

[0001] This invention relates to the field of tire carcass material technology, and in particular to a method for preparing a lightweight cable-type bead with improved performance. Background Technology

[0002] As the skeleton material of a tire, the bead plays a crucial role. Cable beads are favored by major tire manufacturers due to their superior performance. Compared to ordinary beads, the advantages of the cable bead structure are considerable. To maximize the structural advantages of cable beads, researchers have been experimenting with various lightweight materials to replace metal materials, allowing cable beads to achieve optimal performance with minimal weight.

[0003] Current technologies mostly use non-metallic core rings instead of metallic ones. Because the core ring is non-metallic, its support capacity is weaker, resulting in poor bead formation. To improve the bead formation, the core ring diameter needs to be increased to varying degrees, which leads to an increase in the cross-sectional diameter of the bead, ultimately affecting tire forming and manufacturing. Furthermore, due to the softer nature of non-metallic core rings, their clamping force on the tire is also relatively weak.

[0004] Patent CN 101784403 A discloses annular concentric stranded bead cord, its manufacturing method, and a vehicle thereof, providing annular concentric stranded bead cord and its manufacturing method that can reduce weight while maintaining strength. This technology solves the problem of reducing bead weight by improving the strength utilization rate of the sidewall cord and reducing the number of sidewall wires wound. The aforementioned patent achieves this improvement through heat tempering, which is costly, difficult to operate, and prone to damaging the plating on the sidewall surface if not properly controlled. Summary of the Invention

[0005] In view of this, the present invention proposes a method for preparing a lightweight cable-type bead with improved performance. By adjusting the yield strength ratio and self-forming bead diameter of the metal outer winding wire, adjusting the self-forming bead diameter of the non-metal outer winding wire, and adjusting the twist pitch of the non-metal or metal outer winding wire, the weight of the lightweight cable-type bead is reduced by 15-60%, while having strength, formability and stiffness comparable to conventional cable-type bead.

[0006] The technical solution of this invention is implemented as follows:

[0007] This invention provides a method for preparing a lightweight cable-type bead with improved performance, comprising the following steps:

[0008] Step 1: Use a metal wire with a diameter of D0 to make the core coil;

[0009] Step 2: Prepare the non-metallic outer winding wire and the metallic outer winding wire for the outer layer. The wire diameter of the non-metallic outer winding wire and the metallic outer winding wire are the same, both being D1.

[0010] Step 3: Adjust the pressing amount of the straightener to 0.5-3.0mm and adjust the yield strength ratio of the outer metal winding wire to 75-90%.

[0011] Step four involves adjusting the pressing amount of the straightener on the splitter to 0.5-3.0mm, and adjusting the self-forming coil diameter D of the non-metallic outer winding wire and the metallic outer winding wire with the yield strength ratio adjusted in step three. x This makes the self-forming loop diameter D of the non-metallic outer winding wire and the metallic outer winding wire... x With cable-type tire bead inner diameter D c The ratios are all: 0.5 ≤ D x / D c ≤1.0;

[0012] Step 5: Calculate and set the ratio of the winding twist L to the diameter D of the cable bead section as follows: 10≤L / D≤35; when the diameter D1 of the non-metallic or metallic outer winding wire is greater than 1.30mm, 10≤L / D≤25; when the diameter D1 of the non-metallic or metallic outer winding wire is less than or equal to 1.30mm, 20≤L / D≤35.

[0013] Step six involves spirally winding the metal outer winding thread, whose yield strength ratio and self-forming coil diameter have been adjusted through steps three and four, and the non-metal outer winding thread, whose self-forming coil diameter has been adjusted through step four, onto the core ring made in step one, with a certain twist direction and according to the twist pitch L calculated in step five.

[0014] In this invention:

[0015] The inner diameter of the cable-type tire bead is D. c The diameter of the cable-type tire bead cross-section is D;

[0016] The core diameter is D0;

[0017] The diameter of the non-metallic wound wire is the same as that of the metallic wound wire, both being D1; the self-forming loop diameter of the non-metallic wound wire and the metallic wound wire is D. x .

[0018] The core is made of metal. Among one or more outer layers spirally wound around the core, at least one outer layer uses a non-metallic outer winding thread. The metal and non-metallic outer winding threads in the outer layers have the same diameter.

[0019] The working principle of this invention is as follows:

[0020] First, by controlling the yield strength ratio of the metal outer winding, the strength utilization rate of the metal outer winding is improved, which can compensate for the strength reduction caused by the non-metal outer winding.

[0021] After adjusting the strength utilization rate of the metal outer winding, the problem of reduced stiffness caused by the non-metal outer winding is compensated by controlling the ratio of the self-forming loop diameter of the non-metal outer winding and the metal outer winding to the inner diameter of the cable-type tire bead.

[0022] In the above design, the yield strength ratio of the metal outer winding wire needs to be adjusted first, and then the forming coil diameter of the non-metallic outer winding wire and the metal outer winding wire itself needs to be adjusted. Otherwise, if the yield strength ratio of the metal outer winding wire does not meet the standard, then D... x / D c It becomes impossible to control the stiffness within the range of 0.5-1.0, which makes it impossible to compensate for the reduction in stiffness caused by the non-metallic outer winding wire;

[0023] After adjusting the properties of the non-metallic and metallic outer windings, the ratio of the lay length of the non-metallic or metallic outer winding to the cross-sectional diameter of the bead is controlled to reduce the loss of the elastic modulus of the non-metallic or metallic outer winding and reduce the stiffness loss caused by the winding process.

[0024] By controlling the reduction in strength and stiffness through the above three steps, a method for preparing a lightweight cable bead with improved performance is finally obtained. This cable bead has the same structure, size, strength, formability and stiffness as conventional cable beads, and its weight is reduced by 15% to 60% compared with conventional cable beads.

[0025] In this invention, the non-metallic outer winding wire can be a single layer or multiple layers. The non-metallic outer winding wire can be in direct contact with the core ring or in direct contact with the metallic outer winding wire. Preferably, the non-metallic outer winding wire is in direct contact with the metallic outer winding wire, that is, the metallic outer winding wire is in contact with the core wire of the core ring, thereby improving the adhesion between the core wire and the metallic outer winding wire and improving the quality of the cable-type bead.

[0026] When multiple layers of non-metallic outer winding yarn are provided, the non-metallic outer winding yarn layers and the metallic outer winding yarn layers can be arranged adjacently or alternately. Preferably, the multiple layers of non-metallic outer winding yarn are arranged alternately; since the friction between metallic and non-metallic outer winding yarns is lower than the friction between metallic outer winding yarns, the alternating arrangement helps to extend the service life of the tire.

[0027] Preferably, the non-metallic outer winding is aramid thread, or it can be aramid cord. The weight-to-strength ratio of aramid thread or aramid cord is only 1 / 6 that of steel wire; however, the strength of aramid thread or aramid cord can be comparable to that of steel wire of the same diameter. But the processing technology for aramid thread or aramid cord of this strength is more complex and the production cost is higher. Therefore, in order to reduce production costs, the aramid thread or aramid cord produced by ordinary processes in this invention has a strength slightly lower than that of steel wire of equivalent diameter.

[0028] The improved lightweight cable-type bead manufacturing method of the present invention has the following advantages over the prior art:

[0029] 1. Because the diameter of the non-metallic outer winding wire and the metallic outer winding wire are the same, the cable-type tire bead of the present invention has the same size, the same structural regularity and structural stability as the conventional cable-type tire bead.

[0030] 2. By adjusting and controlling the yield strength ratio, the strength utilization rate of the metal outer winding wire is improved, which makes up for the strength reduction caused by the non-metal outer winding wire, so that the cable-type tire bead has a strength level comparable to that of the conventional cable-type tire bead.

[0031] 3. By adjusting the ratio of the self-forming diameter of the metal and non-metal outer winding yarn to the inner diameter of the cable-type bead, the problem of reduced stiffness caused by the non-metal outer winding yarn is compensated, making the cable-type bead closer to the stiffness level of the conventional cable-type bead; at the same time, the production process is smoother and the production efficiency is effectively improved.

[0032] 4. By controlling the ratio of the winding twist pitch to the cross-sectional diameter of the cable bead, the loss of elastic modulus during winding is reduced, which also reduces the loss of stiffness during winding, thereby further improving the stiffness of the lightweight cable bead itself.

[0033] 5. Since the weight-to-strength ratio of the non-metallic outer winding wire is only 1 / 6 that of the steel wire, the weight of the cable-type bead of this invention can be reduced by 15-60% compared with the conventional cable-type bead while maintaining a comparable strength level (because the number of layers of the outer winding wire is different for different cable-type beads, and the number of layers of the non-metallic outer winding wire used in the outer winding wire is also different, therefore, the weight reduction ratio of different cable-type beads is different).

[0034] 6. The manufacturing process of the cable-type tire bead of this invention is the same as that of the conventional cable-type tire bead, and only minor modifications are required to the equipment, making it highly feasible. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 The self-forming loop diameter D of the non-metallic or metallic outer winding wire of the present invention is... x Logo image;

[0037] Figure 2 The inner diameter D of the cable-type bead of the present invention c Logo image;

[0038] Figure 3 This diagram shows the cross-sectional diameter D of the cable-type tire bead, the core bead diameter D0, the wire diameter D1 of the non-metallic outer winding wire, and the wire diameter D1 of the metallic outer winding wire in this invention. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] Taking a 13-inch 1x1.60+(6+12)x1.30 cable bead as an example, the +6 layer is non-metallic braided wire:

[0042] (1) Use metal wire with a diameter of 1.60mm to make the core ring;

[0043] (2) Prepare non-metallic outer winding wire and metallic outer winding wire for winding the outer layer. The wire diameter of the non-metallic outer winding wire is the same as that of the metallic outer winding wire, which is 1.30mm.

[0044] (3) By adjusting the pressing amount of the straightener to 2.4mm, the yield strength ratio of the metal outer winding wire reaches 75%;

[0045] (4) Adjust the forming coil diameter D of the metal and non-metal outer winding wires by adjusting the pressing amount of the straightener of the plate divider to 2.0mm. x The inner diameter D of the cable-type tire bead is 260mm. c If the value is 334mm, then: D x / D c=0.78;

[0046] (5) Calculate and set the winding twist L to 175mm and the diameter of the cable bead cross section D to 6.80mm, then: L / D=26;

[0047] (6) The 1.30mm non-metallic outer winding wire is spirally wound around the core ring made in step (1) with a diameter of 260mm, a twist direction of Z, and a twist distance of 175mm, for 6 turns;

[0048] (7) A 1.30 mm metal outer winding wire with a yield strength ratio of 75% is spirally wound onto the outer layer of the non-metallic outer winding wire prepared in step (6) with a turn diameter of 260 mm, a twist direction of S, and a twist pitch of 175 mm, for 12 turns;

[0049] (8) Make a standard lightweight cable bead with a non-metallic outer winding wire in the +6 layer according to the manufacturing steps of a standard cable bead.

[0050] (9) Make ordinary cable bead according to the manufacturing steps of ordinary cable bead. All outer winding wires of ordinary cable bead are made of metal outer winding wire.

[0051] Table 1 below compares the data of ordinary cable-type tire bead and ordinary lightweight cable-type tire bead with those of Example 1:

[0052]

[0053] Note:

[0054] 1. The method of using the straightener in steps (3) and (4) is the same as the method of using the straightener in the steel wire industry, except that the final purpose is different. The steel wire industry aims to obtain steel wire with good straightness, while this patent aims to obtain metal outer winding wire with controllable yield strength ratio.

[0055] 2. Stiffness coefficient in the table: Here, the stiffness of the ordinary cable bead is regarded as 1. The ratio of the stiffness of the ordinary lightweight cable bead and the stiffness of Example 1 to that of the ordinary cable bead is the stiffness coefficient in the table above. The larger the stiffness coefficient, the greater the stiffness of the lightweight cable bead.

[0056] 3. The breaking tensile force in the table refers to the force required to break the cable bead, which is different from the sum of the breaking tensile forces of a single filament of the cable bead.

[0057] Example 2:

[0058] Taking an 18-inch 1x1.20+(6+12)x0.96 cable-type bead as an example, the +6 layer is non-metallic braided wire:

[0059] (1) Use metal wire with a diameter of 1.20mm to make the core ring;

[0060] (2) Prepare non-metallic outer winding wire and metallic outer winding wire for winding the outer layer. The wire diameter of the non-metallic outer winding wire is the same as that of the metallic outer winding wire, which is 0.96mm.

[0061] (3) By adjusting the pressing amount of the straightener to 0.8mm, the yield strength ratio of the metal outer winding wire reaches 80%;

[0062] (4) Adjust the forming coil diameter D of the metal and non-metal outer winding wires by adjusting the pressing amount of the straightener of the splitter to 1.2mm. x The inner diameter D of the cable-type tire bead is 240mm. c If the value is 466mm, then: D x / D c =0.52;

[0063] (5) Calculate and set the winding twist L to 162mm and the diameter of the cable bead cross section D to 5.04mm, then: L / D=32;

[0064] (6) The 0.96mm non-metallic outer winding wire is spirally wound around the core ring made in step (1) with a diameter of 240mm, a twist direction of Z, and a twist pitch of 162mm, for 6 turns;

[0065] (7) A 0.96mm metal outer winding wire with a yield strength ratio of 80% is spirally wound onto the outer layer of the non-metallic outer winding wire prepared in step (6) with a turn diameter of 240mm, a twist direction of S, and a twist pitch of 162mm, and wound 12 turns.

[0066] (8) Make a standard lightweight cable bead with a non-metallic outer winding wire in the +6 layer according to the manufacturing steps of a standard cable bead.

[0067] (9) Make ordinary cable bead according to the manufacturing steps of ordinary cable bead. All outer winding wires of ordinary cable bead are made of metal outer winding wire.

[0068] Table 2 below compares the data of ordinary cable-type tire bead and ordinary lightweight cable-type tire bead with those of Example 2:

[0069]

[0070] Note: Same as Example 1.

[0071] Example 3:

[0072] Taking a 21-inch 1x6.0+(11+17+23)x2.2 cable bead as an example, the +11 and +17 layers are non-metallic braided wires:

[0073] (1) Use metal wire with a diameter of 6.0mm to make the core ring;

[0074] (2) Prepare non-metallic outer winding wire and metallic outer winding wire for winding the outer layer. The wire diameter of the non-metallic outer winding wire is the same as that of the metallic outer winding wire, which is 2.2mm.

[0075] (3) By adjusting the pressing amount of the straightener to 3.0mm, the yield strength ratio of the metal outer winding wire reaches 85%;

[0076] (4) Adjust the forming coil diameter D of the metal and non-metal outer winding wires by adjusting the pressing amount of the straightener of the plate divider to 2.5mm. x The inner diameter D of the cable-type tire bead is 450mm. c If the value is 532mm, then: D x / D c =0.85;

[0077] (5) Calculate and set the winding twist L to 277mm and the diameter of the cable bead cross section D to 19.2mm, then: L / D=14;

[0078] (6) The 2.2mm non-metallic outer winding wire is spirally wound around the core ring made in step (1) with a diameter of 450mm, a twist direction of S, and a twist pitch of 277mm, for 11 turns;

[0079] (7) The 2.2mm non-metallic outer winding wire is spirally wound onto the non-metallic outer winding wire layer prepared in step (6) with a loop diameter of 450mm, a twist direction of Z, and a twist pitch of 277mm, and wound 17 times.

[0080] (8) A 2.2 mm metal outer winding with a yield strength ratio of 85% is spirally wound onto the outer layer of the non-metallic outer winding prepared in step (7) with a turn diameter of 450 mm, a twist direction of S, and a twist pitch of 277 mm, for 23 turns;

[0081] (9) Make ordinary lightweight cable-type tire bead with non-metallic outer winding wire in +11 and +17 layers according to the ordinary cable-type tire bead making steps;

[0082] (10) Make ordinary cable bead according to the manufacturing steps of ordinary cable bead. All outer winding lines of ordinary cable bead are made of metal outer winding lines.

[0083] Table 3 below compares the data of ordinary cable-type tire bead and ordinary lightweight cable-type tire bead with those of Example 3:

[0084]

[0085]

[0086] Note: Same as Example 1.

[0087] Example 4:

[0088] Taking a 20-inch 1x5+(10+16+22+28+34)x2 cable bead as an example, the +16 and +28 layers are non-metallic braided wires:

[0089] (1) Use metal wire with a diameter of 5.0mm to make the core ring;

[0090] (2) Prepare non-metallic outer winding wire and metallic outer winding wire for winding the outer layer. The wire diameter of the non-metallic outer winding wire is the same as that of the metallic outer winding wire, which is 2.0mm.

[0091] (3) By adjusting the pressing amount of the straightener to 1.7mm, the yield strength ratio of the metal outer winding wire reaches 90%;

[0092] (4) Adjust the forming coil diameter D of the metal and non-metal outer winding wires by adjusting the pressing amount of the straightener of the splitter to 1.7mm. x The inner diameter D of the cable-type tire bead is 520mm. c If the value is 525mm, then: D x / D c =1.00;

[0093] (5) Calculate and set the winding twist L to 330mm and the diameter D of the cable bead cross section to 25mm, then: L / D=13;

[0094] (6) A 2.0 mm metal outer winding thread with a yield strength ratio of 90% is spirally wound around the core ring made in step (1) with a diameter of 520 mm, a twist direction of S, and a twist pitch of 330 mm, for 10 turns;

[0095] (7) The 2.0mm non-metallic outer winding wire is spirally wound onto the metal outer winding wire layer made in step (6) with a loop diameter of 520mm, a twist direction of Z, and a twist pitch of 330mm, for 16 turns;

[0096] (8) A 2.0 mm metal outer winding thread with a yield strength ratio of 90% is spirally wound onto the non-metallic outer winding thread layer prepared in step (7) with a turn diameter of 520 mm, a twist direction of S, and a twist pitch of 330 mm, for 22 turns;

[0097] (9) The 2.0mm non-metallic outer winding wire is spirally wound onto the metal outer winding wire layer made in step (8) with a loop diameter of 520mm, a twist direction of Z, and a twist pitch of 330mm, for 28 turns;

[0098] (10) A 2.0 mm metal outer winding thread with a yield strength ratio of 90% is spirally wound onto the non-metallic outer winding thread layer prepared in step (9) with a turn diameter of 520 mm, a twist direction of S, and a twist pitch of 330 mm, for 34 turns;

[0099] (11) Make ordinary lightweight cable-type tire bead with +16 layers and +28 layers of non-metallic outer winding wire according to the ordinary cable-type tire bead making steps;

[0100] (12) Make ordinary cable bead according to the manufacturing steps of ordinary cable bead. All outer winding lines of ordinary cable bead are made of metal outer winding lines.

[0101] Table 4 below compares the data of ordinary cable-type bead and ordinary lightweight cable-type bead with those of Example 4:

[0102]

[0103]

[0104] Note: Same as Example 1.

[0105] From the data in the table above, we can see that compared with ordinary lightweight cable bead, the weight of ordinary cable bead is significantly reduced, but the breaking tensile strength and stiffness are reduced to varying degrees. The cable bead in the four embodiments of the present invention has the advantage of weight reduction of ordinary lightweight cable bead. At the same time, by controlling the yield strength ratio of the metal outer winding wire, the strength utilization rate of the metal outer winding wire is improved. Therefore, the cable bead in the four embodiments has a breaking tensile strength level that is comparable to or even slightly higher than that of ordinary cable bead. By adjusting and controlling the ratio of the forming loop diameter of the outer winding wire (non-metallic outer winding wire, metallic outer winding wire) to the inner diameter of the cable bead, and the ratio of the winding twist pitch to the cross-sectional diameter of the cable bead, the stiffness of the lightweight cable bead is effectively improved, making it closer to the stiffness level of ordinary cable bead. At the same time, because the loop diameter of the outer winding wire (non-metallic outer winding wire, metallic outer winding wire) is effectively controlled, the production process is easier, the average winding time is reduced to varying degrees, and the production efficiency is effectively improved.

[0106] Comparative Example 1

[0107] Based on Example 1, step 3 is deleted, so that the yield strength ratio of the metal outer winding is the same as that of the ordinary cable-type tire bead metal outer winding, and all other conditions are the same.

[0108]

[0109] As can be seen from the data in Table 5, when the yield strength ratio of the metal outer winding is 93%, the breaking strength of the cable-type bead is lower than that of the ordinary cable-type bead. Because the yield strength ratio of the metal winding is 93%, Dx / Dc cannot be adjusted to the level of 0.5-1.0, so the average winding time is higher than that in Example 1.

[0110] Comparative Example 2

[0111] Based on Example 1, step 4 is deleted so that Dx / Dc is the same as that of ordinary cable bead, and all other conditions are the same.

[0112]

[0113]

[0114] As can be seen from the data in Table 6, when Dx / Dc = 2.4, the stiffness coefficient of the cable bead is significantly reduced, the average winding time is significantly higher than that in Example 1, and the production efficiency is reduced.

[0115] Comparative Example 3

[0116] Based on Example 1, step 5 is deleted so that the L / D is the same as that of a regular cable bead, and all other conditions are the same.

[0117]

[0118] As can be seen from the data in Table 7, when L / D = 19, the stiffness coefficient of the cable bead is lower than that of Example 1. At the same time, because L / D is smaller, the winding twist is smaller, the number of winding turns is more, the average winding time is increased, and the production efficiency is reduced.

[0119] Comparative Example 4

[0120] Based on Example 2, steps 3 and 4 are deleted, while all other conditions remain the same.

[0121]

[0122] As can be seen from the data in Table 8, when the yield strength ratio of the metal wire is the same as that of the ordinary cable bead, and Dx / Dc is the same as that of the ordinary cable bead, the breaking tensile force, stiffness coefficient and production efficiency of the cable bead are all lower than those of Example 2.

[0123] Comparative Example 5

[0124] Based on Example 2, steps 3 and 5 are deleted, while all other conditions remain the same.

[0125]

[0126] As can be seen from the data in Table 9, when the yield strength ratio of the metal wire is the same as that of the ordinary cable-type bead metal wire, and the L / D is the same as that of the ordinary cable-type bead, the breaking tensile force and stiffness coefficient of the cable-type bead are lower than those of Example 2. At the same time, because the yield strength ratio of the metal winding wire is 93%, Dx / Dc cannot be adjusted to the level of 0.5-1.0, so the average winding time is higher than that of Example 1.

[0127] Comparative Example 6

[0128] Based on Example 2, steps 4 and 5 are deleted, while all other conditions remain the same.

[0129]

[0130] As can be seen from the data in Table 10, when Dx / Dc and L / D are kept at the same level as ordinary cable bead, the stiffness coefficient and production efficiency of cable bead are lower than those in Example 2.

[0131] Comparative Example 7

[0132] Based on Example 2, the order of steps 3 and 4 is adjusted, while all other conditions remain the same.

[0133] Specifically, the forming diameter of the non-metallic and metallic outer winding wires is first adjusted by adjusting the straightener of the splitting machine, and then the yield strength ratio of the metallic winding wire is adjusted by adjusting the pressing amount of the straightener.

[0134] This method of operation will destroy the adjusted diameter of the outer winding wire when adjusting the yield strength ratio of the metal outer winding wire, thus failing to achieve the desired process result.

[0135] Comparative Example 8

[0136] Based on Example 3, in step 3, the yield strength ratio is 65% (<75%), and all other conditions are the same.

[0137]

[0138] As can be seen from the data in Table 10, when the yield strength ratio of the metal winding is 65%, the cable-type bead has the same level of performance as the cable-type bead in Example 3 as listed in the table above.

[0139] Although they have the same level of performance as listed in the table, when the yield strength ratio is 65%, the outer winding (metallic and non-metallic outer winding) will undergo plastic deformation under a lower external force of 404.3KN, resulting in cable bead failure. In other words, the lower yield strength ratio will lead to the outer winding not being effectively utilized.

[0140] Comparative Example 9

[0141] Based on Example 4, in step 4, D x / D c =0.35 (<0.5), all other conditions are the same.

[0142] Specifically, the outer winding yarn's forming diameter is adjusted by increasing the pressure of the straightener on the splitter, so that its ratio to the inner diameter of the cable-type tire bead is 0.35.

[0143] In this method, because the outer winding itself has a small forming diameter, the outer winding thread and the core ring cannot maintain good contact and fixation during the winding process. The outer winding thread layer and the core thread of the entire cable-type bead exhibit obvious delamination and separation, resulting in poor integrity.

[0144] Comparative Example 10

[0145] Based on Example 4, in step 5, L / D = 9 (< 10), and all other conditions are the same.

[0146]

[0147] As can be seen from the data in Table 12, when L / D = 9, the decrease in the winding twist pitch leads to an increase in the loss of elastic modulus during the winding process, resulting in an increase in the stiffness loss of the cable bead. The stiffness coefficient of Comparative Example 10 is lower than that of Example 4. Simultaneously, the decrease in the winding twist pitch leads to an increase in the total number of winding turns, thus increasing the average winding time and reducing the effectiveness.

[0148] Comparative Example 11

[0149] Based on Example 4, in step 5, L / D = 39 (>35), and all other conditions are the same.

[0150] In this situation, with a twist pitch of 875mm, there are only 2 twist pitches when wrapping the cable-type tire bead core wire once. The outer winding wire cannot make good contact and fixation with the core wire, resulting in the cable-type tire bead being unable to be wound.

[0151] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a lightweight cable-type bead with improved performance, characterized in that, Includes the following steps: Step 1: Use a metal wire with a diameter of D0 to make the core coil; Step 2: In one or more outer layers spirally wound around the core ring, at least one outer layer uses a non-metallic outer winding wire; prepare the non-metallic outer winding wire and the metallic outer winding wire for winding the outer layers, the wire diameter of the non-metallic outer winding wire and the wire diameter of the metallic outer winding wire are the same, both are D1; Step 3: Adjust the yield strength ratio of the outer metal winding wire to 75-90% by adjusting the pressing amount of the straightener; Step four involves adjusting the pressing amount of the straightener on the splitter to adjust the self-forming loop diameter D of the non-metallic outer winding wire and the metallic outer winding wire with the yield strength ratio adjusted in step three. x This makes the self-forming loop diameter D of the non-metallic outer winding wire and the metallic outer winding wire... x With cable-type tire bead inner diameter D c The ratios are all: 0.5 ≤ D x / D c ≤1.0; Step 5 involves spirally winding the metal outer winding wire, whose yield strength ratio and self-forming coil diameter have been adjusted in steps 3 and 4, and the non-metal outer winding wire, whose self-forming coil diameter has been adjusted in step 4, onto the core ring made in step 1 according to the predetermined twist pitch and twist direction. Between steps four and five, the twist pitch also needs to be set. Specifically, the ratio of the winding twist pitch L to the diameter D of the cable bead section is calculated and set. When the diameter D1 of the non-metallic outer winding wire and the metallic outer winding wire is greater than 1.30 mm, 10 ≤ L / D ≤ ​​25; when the diameter D1 of the non-metallic outer winding wire and the metallic outer winding wire is less than 1.30 mm, 20 ≤ L / D ≤ ​​35.

2. A lightweight cable-type bead prepared by the preparation method according to claim 1, characterized in that: In the lightweight cable-type bead, the non-metallic outer winding wire is in direct contact with the core bead, or in direct contact with the metallic outer winding wire.

3. The lightweight cable-type tire bead as described in claim 2, characterized in that: The non-metallic outer winding wire is in direct contact with the metallic outer winding wire.

4. The lightweight cable-type tire bead as described in claim 2, characterized in that: In the lightweight cable-type bead, when the non-metallic outer winding is multi-layered, the non-metallic outer winding layers and the metallic outer winding layers are arranged adjacently or alternately.

5. The lightweight cable-type tire bead as described in claim 4, characterized in that: The non-metallic outer windings of the multilayers are arranged alternately.

6. The lightweight cable-type tire bead as described in claim 2, characterized in that: The non-metallic outer winding thread is aramid thread.

7. The method for preparing the performance-improved lightweight cable-type bead as described in claim 1, characterized in that: In step three, the pressing amount of the straightener is 0.5-3.0mm; in step four, the pressing amount of the straightener of the plate divider is 0.5-3.0mm.

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