A manufacturing method of a cable type bead for a passenger car tire

Abstract

The application provides a manufacturing method of a cable type bead for a car tire, which can be predicted, and comprises the following steps: adjusting the yield ratio of a qualified outer winding wire through a straightening tool, and controlling the yield ratio of the outer winding wire to be 70%-90%; the pressing amount of a straightening wheel of the straightening tool is 0-3mm, and the pressing mode of the straightening tool is that the pressing force decreases from top to bottom; finally, the adjusted outer winding wire is obtained; and the outer winding wire with the adjusted yield ratio is wound on a qualified core bead in a spiral winding mode according to the set twisting pitch and twisting direction. Through the effective control and adjustment of the yield ratio of the outer winding wire of the cable type bead through the straightening tool, the cable type bead can be deformed slightly before failure, the time of failure of the cable type bead is delayed, and accidents can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of tire carcass material technology, and in particular to a method for manufacturing a cable-type bead for passenger car tires that allows for prediction. Background Technology

[0002] As the skeleton material of a tire, the bead plays a crucial role. It not only anchors the tire to the wheel rim but also withstands various interactions between the tire and the rim during vehicle operation. For energy conservation and environmental protection, one of the demands of vehicle manufacturers on tire manufacturers is lightweight tires, and cable-type bead tires are favored by many tire manufacturers due to their unique structure.

[0003] The structure of the cable-type tire bead is as follows Figure 1 and Figure 2 As shown, the cable-type tire bead is formed by spirally winding the outer winding wire 2 onto the core ring 1 in a single layer or multiple layers. The core ring 1 is formed by pre-bending the steel wire and then welding the two ends together. Due to the special characteristics of its circular cross-section and spiral structure, the cable-type tire bead has a series of advantages such as high strength, light weight, uniform stress distribution, and stable shape.

[0004] Yield strength is a time-dependent stress parameter of a material before it fractures. The ratio of yield strength to tensile strength is called the yield-to-tensile strength ratio. A yield-to-tensile strength ratio that is too low means that the material is prone to plastic deformation, which is unacceptable for cable tire bead materials. As the skeleton material of the tire, it needs to withstand various interaction forces between the tire and the rim during vehicle operation. A yield-to-tensile strength ratio that is too high means that the cable tire bead will basically fracture and fail at the same time as yielding, without any obvious signs before fracture failure.

[0005] Although the special spiral structure and other advantages of cable bead tires greatly improve tire safety, existing cable bead tires generally have a very high yield strength ratio (greater than 93%) because they need to withstand various interaction forces between the tire and the rim during vehicle operation. This often leads to cable bead tires failing without warning, resulting in traffic accidents. Summary of the Invention

[0006] In view of this, the present invention proposes a method for manufacturing a cable-type bead for passenger car tires that allows for predictive testing. By using a straightening tool 3 to effectively control and adjust the yield strength ratio of the outer winding thread of the cable-type bead, keeping it within the range of 70%-90%, the cable-type bead undergoes a significant micro-deformation before failure. This significant micro-deformation delays the onset of cable-type bead failure, providing more time for people to identify tire failure and thus better and more effectively preventing accidents.

[0007] The technical solution of this invention is implemented as follows:

[0008] This invention provides a method for manufacturing a cable-type bead for passenger car tires that allows for predictive testing, comprising the following steps:

[0009] Step 1: Adjusting the yield strength ratio of the outer winding of the cable-type tire bead.

[0010] The yield strength ratio of the qualified outer winding is adjusted by straightening tool 3, and the yield strength ratio of the outer winding is controlled to be 70%-90%. The straightening wheel in straightening tool 3 is pressed in by 0-3mm, and the straightening tool 3 is pressed in a way that the pressing force decreases from top to bottom. Finally, the adjusted outer winding is obtained.

[0011] Step 2: Making cable-shaped tire bead

[0012] The outer winding thread with the adjusted yield strength ratio is wound into the core ring in a spiral manner according to the set twist pitch and twist direction.

[0013] See Figure 3 The straightening tool 3 includes a left row of straightening wheels 31 and a right row of straightening wheels 32 capable of moving in opposite directions. The left row of straightening wheels 31 and the right row of straightening wheels 32 are arranged alternately in the vertical direction. See [link to documentation]. Figure 4 The outer winding wire is inserted from top to bottom between the left straightening roller 31 and the right straightening roller 32. In the straightening tool 3, the pressing amount of the straightening roller is the overlap width between the tangent e of the left straightening roller 31 and the tangent f of the right straightening roller 32; after the outer winding wire is inserted from top to bottom, the left straightening roller 31 and the right straightening roller 32 move towards each other, and the tangents e and f approach each other until they overlap and intersect, as shown. Figure 4 In the process, when tangents e and f overlap and intersect, the yield strength ratio of the outer winding line is adjusted.

[0014] See Figure 3 In this invention, for ease of explanation, the straightening tool 3 is divided into four parts from top to bottom: part a, part b, part c, and part d. The straightening tool 3 is tightened by decreasing pressure from top to bottom. The pressure decreases as follows: the straightening wheel in part a is pressed in by 2-3 mm; in part b by 1-2 mm; in part c by 0.5-1 mm; and in part d by 0-0.5 mm, gradually decreasing from 0.5 mm to 0 mm. See also... Figure 4 As the straightening tool 3 moves from top to bottom, the width of the overlapping and intersecting tangents e and f gradually decreases due to the reduced clamping force. In other words, the amount of pressure pressed in by the straightening wheel gradually decreases, and the ellipticity of the outer winding line improves from top to bottom.

[0015] The routing of the outer winding wire in the straightening tool 3 includes S-shaped routing or serpentine routing. Since the S-shaped routing has a large force, the adjustment force for the yield strength ratio of the outer winding wire is too large. Therefore, the serpentine routing is selected in this invention to control the yield strength ratio of the outer winding wire to 70%-90%.

[0016] In step one above, the diameter of the outer winding wire that meets the requirements is φ1.00mm-φ3.00mm.

[0017] In step two above, the diameter of the core coil wire that meets the requirements is φ1.30mm-φ4.5mm.

[0018] The outer winding thread has a single, double, or triple layer structure, with each layer consisting of a single steel wire, and the ends are fixedly connected by a sleeve.

[0019] The quality of cable-type tire bead includes both a safety factor and ellipticity or flatness. A low safety factor directly affects the accident rate, while poor ellipticity or flatness renders the cable-type tire bead unusable, directly increasing the defect rate, production costs, and reducing production efficiency. In this invention, adjusting the yield strength ratio of the outer winding yarn inevitably affects the ellipticity of the outer winding yarn; that is, both the yield strength ratio and ellipticity of the outer winding yarn change simultaneously during adjustment. Therefore, while controlling the yield strength ratio of the outer winding yarn to 70%-90%, this invention also requires controlling the pressing amount of the straightening wheel in the straightening tool 3 to 0-3mm, and ensuring that the straightening tool 3's clamping method involves decreasing clamping force from top to bottom. Only in this way can both the yield strength ratio and ellipticity of the outer winding yarn be maintained at a good level.

[0020] Preferably, the yield strength ratio of the outer winding thread is 80-85%. When the yield strength ratio is adjusted to 80-85%, the safety factor of the resulting cable-type bead is relatively high, and the ovality or flatness is also relatively good.

[0021] This invention adjusts the yield strength ratio of the outer winding thread to produce a cable-shaped tire bead, which is mainly used for tubeless cars, but can also be used for tubeless tires on bicycles, electric vehicles, or motorcycles.

[0022] The method for manufacturing a cable-type bead for passenger car tires that allows for prediction, as described in this invention, has the following advantages over the prior art:

[0023] 1. The present invention relates to a cable-type tire bead for passenger cars. By adjusting the yield strength ratio of the outer winding thread to 70%-90%, the cable-type tire bead will undergo a larger micro-deformation than ordinary steel bead before it breaks and fails, thus delaying tire failure and providing users with more time to identify tire failure, thereby better preventing traffic accidents.

[0024] 2. In order to achieve the desired adjustment effect on the yield strength ratio of the outer winding, the straightening wheel in the straightening tool 3 should be pressed in by 0-3mm.

[0025] 3. After adjusting the yield strength ratio of the outer winding thread, it is also necessary to ensure the ellipticity of the outer winding thread. Therefore, the clamping method of the straightening tool 3 is set to decrease the clamping force from top to bottom. The clamping amount of the straightening wheel in the first part a is 2-3mm, the clamping amount of the straightening wheel in the second part b is 1-2mm, the clamping amount of the straightening wheel in the third part c is 0.5-1mm, and the clamping amount of the straightening wheel in the fourth part d is 0-0.5mm, and gradually decreases from 0.5mm to 0mm. The above clamping method not only ensures the adjustment of the yield strength ratio of the outer winding thread, but also ensures the ellipticity of the outer winding thread, improves the ellipticity and flatness of the finished cable-type tire bead, and thus improves the quality.

[0026] 4. The cable-type tire bead of the present invention for passenger cars retains a series of advantages of the original cable-type tire bead, such as high strength, light weight, uniform stress distribution, and stable shape; at the same time, the manufacturing process is simple, the cost is low, and the operation is highly controllable. Attached Figure Description

[0027] 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.

[0028] Figure 1 A three-dimensional view of a cable-type tire bead in the prior art;

[0029] Figure 2 Here is a cross-sectional view of a cable-type tire bead in the prior art:

[0030] Figure 3 This is a schematic diagram of the straightening tool structure;

[0031] Figure 4 A diagram illustrating the working state of a straightening tool for straightening externally wound lines.

[0032] In the diagram: core ring 1, outer winding line 2; straightening tool 3, left row of straightening rollers 31, right row of straightening rollers 32. Detailed Implementation

[0033] 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.

[0034] Example 1: Single-layer cable-type bead for passenger car tires

[0035] A method for manufacturing a cable-type bead for passenger car tires that allows for predictive behavior includes the following steps:

[0036] (1) Cable type tire bead: It consists of a ring core made of core wire and an outer winding line spirally wound on the ring core;

[0037] (2) Core wire: The core wire diameter of the cable-type tire bead for automobiles is φ2.20mm. The ends of the φ2.20mm core wire that meets the requirements are welded together and polished smooth.

[0038] (3) Outer winding line: The diameter of the steel wire for the outer winding line of the cable-type tire bead for passenger cars is φ1.55mm;

[0039] (4) Yield strength ratio adjustment and control: The φ1.55mm outer winding wire that meets the requirements is adjusted for yield strength ratio through a special straightening tool 3, with a control range of 75%. The outer winding wire is routed in a serpentine pattern in the straightening tool 3, and the clamping method is tight at the top and loose at the bottom. This clamping method not only ensures the adjustment of the yield strength ratio of the outer winding wire, but also ensures the ellipticity of the outer winding wire.

[0040] The straightening tool 3 is divided into four parts from top to bottom. The straightening tool 3 is clamped by decreasing clamping force from top to bottom. The clamping force decreases as follows: the straightening wheel in part a is pressed in by 2.5 mm, the straightening wheel in part b is pressed in by 1.6 mm, the straightening wheel in part c is pressed in by 0.7 mm, and the straightening wheel in part d is pressed in by 0.3 mm, gradually decreasing to 0 mm.

[0041] (5) Cable-type tire bead making: Fix the φ2.20mm core ring that meets the requirements on the cable-type tire bead making machine. Fix one end of the φ1.55mm outer winding wire with the adjusted yield strength ratio to the core ring through masking tape (adhesive paper of other materials or film with the same composition as tire rubber). The twist pitch is 170mm, the twist direction is S, and the number of twists is 50. Start the machine, and the outer winding wire will be evenly wound on the core ring in a spiral winding manner. After the winding is completed, remove the masking tape that fixes the end of the outer winding wire, and fix the beginning and end of the outer winding wire with a sleeve.

[0042] Table 1 shows a comparison of the data from Example 1 and Comparative Example 1.

[0043]

[0044] The following method was used to calculate the yield strength and elongation of the cable bead to breakage:

[0045] ① The force F required to yield and fracture

[0046] The breaking force test of the cable bead is conducted according to the national standard GB / T14450-2016. The breaking force of the cable bead at the breakage point is F1, and the breaking force at the yield point of the cable bead is F2. Then, the force F of the cable bead from yielding to breaking is:

[0047]

[0048] ② Elongation L from yield to fracture

[0049] The tensile test of the cable bead was conducted according to GB / T 228.1-2021 and GB / T14450-2016. We calculated the elongation L2 of the cable bead at the yield point based on its yield point elongation rate; and calculated the elongation L1 at fracture based on its breakage elongation rate. Therefore, the elongation L from yield to failure of the cable bead is:

[0050]

[0051] As shown in Table 1, the cable-type bead in Example 1 has an outer winding yield strength ratio of 75%. Even after yielding, the cable-type bead can still withstand a force of 8.25 kN, meaning it still has a certain safety margin. Furthermore, the cable-type bead in Example 1 exhibits a larger slight deformation of 59 mm from yielding to fracture compared to a regular steel bead (Elongation L from yielding to fracture of the cable-type bead in Table 1). This slight deformation provides more time for people to identify tire failure, thus better and more effectively preventing accidents.

[0052] Example 2: Single-layer cable-type bead for passenger car tires

[0053] A method for manufacturing a cable-type bead for passenger car tires that allows for predictive behavior includes the following steps:

[0054] (1) Cable type tire bead: It consists of a ring core made of core wire and an outer winding line spirally wound on the ring core;

[0055] (2) Core wire: The core wire diameter of the cable-type tire bead for automobiles is φ3.00mm. The ends of the φ3.00mm core wire that meets the requirements are welded together and polished smooth.

[0056] (3) Outer winding line: The diameter of the steel wire for the outer winding line of the cable-type tire bead for passenger cars is φ1.50mm;

[0057] (4) Yield strength ratio adjustment and control: The φ1.50mm outer winding wire that meets the requirements is adjusted for yield strength ratio through a special straightening tool 3, with a control range of 80%. The outer winding wire is routed in a serpentine pattern in the straightening tool 3, and the clamping method is tight at the top and loose at the bottom. This clamping method not only ensures the adjustment of the yield strength ratio of the outer winding wire, but also ensures the ellipticity of the outer winding wire.

[0058] The straightening tool 3 is divided into four parts from top to bottom. The clamping method of the straightening tool 3 is that the clamping force decreases from top to bottom. The clamping force decreases as follows: the straightening wheel in the first part a is pressed in by 2.7 mm, the straightening wheel in the second part b is pressed in by 1.6 mm, the straightening wheel in the third part c is pressed in by 0.5 mm, the straightening wheel in the fourth part d is pressed in by 0.4 mm, and gradually decreases to 0.

[0059] (5) Cable-type tire bead making: Fix the φ3.00mm core ring that meets the requirements on the cable-type tire bead making machine. Fix one end of the φ1.50mm outer winding wire with the adjusted yield strength ratio to the core ring through masking tape (adhesive paper of other materials or film with the same composition as tire rubber). The twist pitch is 184mm, the twist direction is S, and the number of twists is 65. Start the machine, and the outer winding wire will be evenly wound on the core ring in a spiral winding manner. After the winding is completed, remove the masking tape that fixes the end of the outer winding wire, and fix the beginning and end of the outer winding wire with a sleeve.

[0060] Table 2 shows a comparison of the data from Example 2 and Comparative Example 1.

[0061]

[0062] The calculation method for the force and elongation of the cable-type bead from yielding to fracture is the same as in Example 1.

[0063] As shown in Table 2, the cable-type bead in Example 2 has an outer winding yield strength ratio of 80%. Even after yielding, the cable-type bead can still withstand a force of 8.0 kN, meaning it still has a certain safety margin. Furthermore, the cable-type bead in this example exhibits a larger slight deformation of 68 mm from yielding to fracture compared to a regular steel bead (Elongation L from yielding to fracture of the cable-type bead in Table 2). This slight deformation provides more time for people to identify tire failure, thus better and more effectively preventing accidents.

[0064] Example 3: Double-layer cable-type bead for passenger car tires

[0065] A method for manufacturing a cable-type bead for passenger car tires that allows for predictive behavior includes the following steps:

[0066] (1) Cable type tire bead: It consists of a ring core made of core wire and an outer winding line spirally wound on the ring core;

[0067] (2) Core wire: The core wire diameter of the cable-type tire bead for passenger cars is φ1.50mm. The ends of the φ1.50mm core wire that meets the requirements are welded together and polished smooth.

[0068] (3) Outer winding wire: The diameter of the steel wire in the core ring of the cable-type tire bead for passenger cars is φ1.30mm;

[0069] (4) Yield strength ratio adjustment and control: The φ1.30mm outer winding wire that meets the requirements is adjusted for yield strength ratio through a special straightening tool 3, with a control range of 87%. The outer winding wire is routed in a serpentine pattern in the straightening tool 3, and the clamping method is tight at the top and loose at the bottom. This clamping method not only ensures the adjustment of the yield strength ratio of the outer winding wire, but also ensures the ellipticity of the outer winding wire.

[0070] The straightening tool 3 is divided into four parts from top to bottom. The clamping method of the straightening tool 3 is that the clamping force decreases from top to bottom. The clamping force decreases as follows: the straightening wheel in the first part a is pressed in by 2.2 mm, the straightening wheel in the second part b is pressed in by 1.3 mm, the straightening wheel in the third part c is pressed in by 0.6 mm, the straightening wheel in the fourth part d is pressed in by 0.2 mm, and gradually decreases to 0.

[0071] (5) Cable-type tire bead making: Fix the φ1.50mm core ring that meets the requirements on the cable-type tire bead making machine. Fix one end of the φ1.30mm outer winding wire with the adjusted yield strength ratio to the core ring through masking tape (adhesive tape of other materials or adhesive film with the same composition as tire rubber). The twist pitch is 171mm, the twist direction is Z, and the number of twists is 43. Start the machine, and the outer winding wire will be evenly wound on the core ring in a spiral winding manner. After the winding is completed, remove the masking tape that fixes the end of the outer winding wire, fix the beginning and end of the outer winding wire with a sleeve, and then perform the second layer of winding. The twist pitch of the second layer is 171mm, the twist direction is S, and the number of twists is 85. The winding method is the same as the first layer.

[0072] Table 3 shows a comparison of the data from Example 3 and Comparative Example 1.

[0073]

[0074] The calculation method for the force and elongation of the cable-type bead from yielding to fracture is the same as in Example 1.

[0075] As shown in Table 3, the cable-type bead in Example 3 has an outer winding yield strength ratio of 87%. Even after yielding, the cable-type bead can still withstand a force of 7.15 kN, meaning it still has a certain safety margin. Furthermore, the cable-type bead in this example exhibits a larger slight deformation of 70 mm from yielding to fracture compared to a regular steel bead (Elongation L from yielding to fracture of the cable-type bead in Table 3). This slight deformation provides more time for people to identify tire failure, thus better and more effectively preventing accidents.

[0076] Example 4: Single-layer cable-type bead for passenger car tires

[0077] A method for manufacturing a cable-type bead for passenger car tires that allows for predictive behavior includes the following steps:

[0078] (1) Cable type tire bead: It consists of a ring core made of core wire and an outer winding line spirally wound on the ring core;

[0079] (2) Core wire: The core wire diameter of the cable-type tire bead for passenger cars is φ2.15mm. Weld the ends of the φ2.15mm core wire that meets the requirements and grind it smooth.

[0080] (3) Outer winding line: The diameter of the steel wire for the outer winding line of the cable-type tire bead for passenger cars is φ1.30mm;

[0081] (4) Yield strength ratio adjustment and control: The φ1.30mm outer winding wire that meets the requirements is adjusted for yield strength ratio through a special straightening tool 3, with a control range of 70%. The outer winding wire is routed in a serpentine pattern in the straightening tool 3, and the clamping method is tight at the top and loose at the bottom. This clamping method not only ensures the adjustment of the yield strength ratio of the outer winding wire, but also ensures the ellipticity of the outer winding wire.

[0082] The straightening tool 3 is divided into four parts from top to bottom. The clamping method of the straightening tool 3 is that the clamping force decreases from top to bottom. The clamping force decreases as follows: the straightening wheel in the first part a is pressed in by 2.4 mm, the straightening wheel in the second part b is pressed in by 1.6 mm, the straightening wheel in the third part c is pressed in by 0.5 mm, the straightening wheel in the fourth part d is pressed in by 0.2 mm, and gradually decreases to 0 mm.

[0083] (5) Cable-type tire bead making: Fix the φ2.15mm core ring that meets the requirements on the cable-type tire bead making machine. Fix one end of the φ1.3mm outer winding wire with the adjusted yield strength ratio to the core ring through masking tape (adhesive paper of other materials or film with the same composition as tire rubber). The twist pitch is 175mm, the twist direction is S, and the number of twists is 49. Start the machine, and the outer winding wire will be evenly wound on the core ring in a spiral winding manner. After the winding is completed, remove the masking tape that fixes the end of the outer winding wire, and fix the beginning and end of the outer winding wire with a sleeve.

[0084] Table 4 shows a comparison of the data from Example 4 and Comparative Example 1.

[0085]

[0086] The calculation method for the force and elongation of the cable-type bead from yielding to fracture is the same as in Example 1.

[0087] As shown in Table 4, the cable-type bead in Example 4 has an outer winding yield strength ratio of 70%. Even after yielding, the cable-type bead can still withstand a force of 7.29 kN, meaning it still has a certain safety margin. Furthermore, the cable-type bead in Example 4 exhibits a larger micro-deformation of 50.3 mm from yielding to fracture compared to a regular steel bead (Elongation L from yielding to fracture of the cable-type bead in Table 4). This micro-deformation provides more time for people to identify tire failure, thus better and more effectively preventing accidents.

[0088] Example 5: Single-layer cable-type bead for passenger car tires

[0089] A method for manufacturing a cable-type bead for passenger car tires that allows for predictive behavior includes the following steps:

[0090] (1) Cable type tire bead: It consists of a ring core made of core wire and an outer winding line spirally wound on the ring core;

[0091] (2) Core wire: The core wire diameter of the cable-type tire bead for automobiles is φ4.00mm. The ends of the φ4.00mm core wire that meets the requirements are welded together and polished smooth.

[0092] (3) Outer winding wire: The diameter of the steel wire for the outer winding wire of the cable-type tire bead for passenger cars is φ2.20mm;

[0093] (4) Yield strength ratio adjustment and control: The φ2.20mm outer winding wire that meets the requirements is adjusted for yield strength ratio through a special straightening tool 3, with a control range of 90%. The outer winding wire is routed in a serpentine pattern in the straightening tool 3, and the clamping method is tight at the top and loose at the bottom. This clamping method not only ensures the adjustment of the yield strength ratio of the outer winding wire, but also ensures the ellipticity of the outer winding wire.

[0094] The straightening tool 3 is divided into four parts from top to bottom. The clamping method of the straightening tool 3 is that the clamping force decreases from top to bottom. The clamping force decreases as follows: the straightening wheel in the first part a is pressed in by 2.6 mm, the straightening wheel in the second part b is pressed in by 1.3 mm, the straightening wheel in the third part c is pressed in by 0.7 mm, the straightening wheel in the fourth part d is pressed in by 0.5 mm, and gradually decreases to 0 mm.

[0095] (5) Cable-type tire bead making: Fix the φ4.00mm core ring that meets the requirements on the cable-type tire bead making machine. Fix one end of the φ2.20mm outer winding wire with the adjusted yield strength ratio to the core ring through masking tape (adhesive paper of other materials or film with the same composition as tire rubber). The twist pitch is 215mm, the twist direction is S, and the number of twists is 49. Start the machine, and the outer winding wire will be evenly wound on the core ring in a spiral winding manner. After the winding is completed, remove the masking tape that fixes the end of the outer winding wire, and fix the beginning and end of the outer winding wire with a sleeve.

[0096] Table 5 shows a comparison of the data from Example 5 and Comparative Example 1.

[0097]

[0098] The calculation method for the force and elongation of the cable-type bead from yielding to fracture is the same as in Example 1.

[0099] As shown in Table 5, the cable-type bead in Example 5 has an outer winding yield strength ratio of 90%. Even after yielding, the cable-type bead can still withstand a force of 6.43 kN, meaning it still has a certain safety margin. Furthermore, the cable-type bead in Example 5 exhibits a larger micro-deformation of 70.95 mm from yielding to fracture compared to a regular steel bead (Elongation L from yielding to fracture of the cable-type bead in Table 5). This micro-deformation provides more time for people to identify tire failure, thus better and more effectively preventing accidents.

[0100] The data from the five embodiments above show that the yield strength ratio of the outer winding of the cable bead in the five embodiments is 70-90%, while the yield strength ratio of the outer winding of the cable bead in Comparative Example 1 is generally greater than 93%. The force that the cable bead in each embodiment can withstand after yielding is greater than that in Comparative Example 1, indicating that the safety factor of the cable bead in the embodiments is higher than that in Comparative Example 1. At the same time, the minute deformation generated from yielding to fracture of the cable bead in each embodiment is greater than that in Comparative Example 1, indicating that the cable bead in the embodiments provides more time for people to identify tire failure and can better prevent accidents.

[0101] Comparative Example 1

[0102] Use commercially available cable-type tire bead for passenger cars. (The yield strength ratio of the outer winding thread is greater than 93%)

[0103] The cable-type bead structure includes five types: 1x2.20+(7)x1.55, 1x3.0+(9)x1.50, 1x1.50+(6+12)x1.30, 1x2.15+(8)x1.30, and 1x4.0+(8)x2.2.

[0104] Comparative Example 2

[0105] Based on Example 2, the yield strength ratio of the outer winding of the cable-type bead was adjusted to 68%.

[0106] When the yield strength ratio is below 70%, the outer winding will undergo plastic deformation under relatively low external force, leading to the failure of the cable-type bead (taking 1x4.0+8x2.2 as an example, the cable-type bead can normally bear a load of about 60KN, but if the yield strength ratio of the outer winding drops to 60%, the load that the cable-type bead can bear will drop to about 40KN). In other words, a low yield strength ratio will result in the outer winding not being effectively utilized.

[0107] Comparative Example 3

[0108] Based on Example 2, the straightening tool 3 is pressed down with the same pressure from top to bottom, the straightening wheel is pressed in by 3.2 mm, and all other conditions are the same.

[0109] In this comparative example, the clamping method of the straightening tool 3 directly results in a large wavy shape and a very high degree of curvature in the outer winding thread, rendering the resulting cable-shaped tire bead unusable, increasing production costs, and reducing production efficiency. Simultaneously, the yield strength ratio of the outer winding thread is below 70%, meaning it will undergo plastic deformation under relatively low external force, thus rendering it unusable.

[0110] Comparative Example 4

[0111] Based on Example 2, the straightening tool 3 is pressed down with the same pressure from top to bottom, the straightening wheel is pressed in by 2.5 mm, and all other conditions are the same.

[0112] In this comparative example, the clamping method of the straightening tool 3 will directly result in the outer winding line having a wavy shape and a large degree of curvature. Although the curvature is slightly less than that in comparative example 3, it still makes the produced cable-shaped tire bead unusable, increasing production costs and reducing production efficiency.

[0113] Comparative Example 5

[0114] Based on Example 2, the straightening tool 3 is pressed down with the same pressure from top to bottom, the straightening wheel is pressed in by 1.3 mm, and all other conditions are the same.

[0115] In this comparative example, the clamping method of the straightening tool 3 directly results in the outer winding thread having a small wavy shape and minimal curvature. However, the resulting cable-shaped bead is still unusable and is a defective product, increasing production costs and reducing production efficiency. Simultaneously, the yield strength ratio of the outer winding thread is higher than 90%, meaning the cable-shaped bead can withstand very little force after yielding, making it prone to failure. The minute deformation from yielding to fracture in the cable-shaped bead is relatively small, failing to extend the failure time and increasing the risk of accidents.

[0116] Comparative Example 6

[0117] Based on Example 2, the straightening tool 3 is divided into two parts from top to bottom. The straightening tool 3 is pressed in such a way that the pressing force decreases from top to bottom. The pressing force decreases in the following way: the pressing amount of the straightening wheel in the first part is 2.5mm, and the pressing amount of the straightening wheel in the second part is 1.4mm. All other conditions are the same.

[0118] In this comparative example, the clamping method of the straightening tool 3 will directly cause the outer winding thread to have large and small waves appearing at intervals, resulting in curvature. The resulting cable-shaped tire bead cannot be used and is a defective product, which increases production costs and reduces production efficiency.

[0119] Comparative Example 7

[0120] Based on Example 2, the straightening tool 3 is divided into two parts from top to bottom. The straightening tool 3 is pressed in such a way that the pressing force decreases from top to bottom. The pressing force decreases in the following way: the pressing amount of the straightening wheel in the first part is 1.2 mm, and the pressing amount of the straightening wheel in the second part is 0.5 mm. All other conditions are the same.

[0121] In this comparative example, the clamping method of the straightening tool 3 directly results in the outer winding thread having intermittent large and small waves, exhibiting curvature. The resulting cable-shaped tire bead is unusable, a defective product, increasing production costs and reducing production efficiency. Simultaneously, the yield strength ratio of the outer winding thread is higher than 90%, meaning the cable-shaped tire bead can withstand very little force after yielding, making it very prone to failure. The minute deformation from yielding to fracture in the cable-shaped tire bead is relatively small, failing to prolong the failure time and easily leading to accidents.

[0122] Comparative Example 8

[0123] Based on Example 2, the straightening tool 3 is divided into three parts from top to bottom. The straightening tool 3 is pressed in such a way that the pressing force decreases from top to bottom. The pressing force decreases in the following ways: the pressing amount of the straightening wheel in the first part is 2.2 mm, the pressing amount of the straightening wheel in the second part is 1.4 mm, and the pressing amount of the straightening wheel in the third part is 0.6 mm.

[0124] In this comparative example, the clamping method of the straightening tool 3 will cause the outer winding line to still have a small wave shape and a small degree of curvature. The resulting cable-shaped tire bead will still be unusable and will be a defective product, increasing production costs and reducing production efficiency.

[0125] Comparative Example 9

[0126] Based on Example 1, only the yield strength ratio of the outer winding thread was adjusted to 70%, while all other conditions remained the same.

[0127] Comparative Example 10

[0128] Based on Example 1, only the yield strength ratio of the outer winding thread was adjusted to 80%, while all other conditions remained the same.

[0129] Comparative Example 11

[0130] Based on Example 1, only the yield strength ratio of the outer winding thread was adjusted to 85%, while all other conditions remained the same.

[0131] Comparative Example 12

[0132] Based on Example 1, only the yield strength ratio of the outer winding thread was adjusted to 90%, while all other conditions remained the same.

[0133]

[0134] As can be seen from Example 1 and Comparative Examples 9-12, for the same cable-type bead structure, only the yield strength ratio is changed: 70%, 75%, 80%, 85%, 90%.

[0135] When the yield strength ratio is 80%, the breaking force at the yield point of the cable bead is 26.4KN, indicating that the cable bead can withstand a large force. At the same time, the elongation from yield to fracture is 58mm, which is also relatively significant.

[0136] When the yield strength ratio is 85%, the breaking force at the yield point of the cable bead is 28.05KN. The cable bead can withstand a large force. At the same time, the elongation from yield to fracture is 57mm, which is also relatively significant.

[0137] When the yield strength ratio is 90%, the breaking force of the cable bead at the yield point is 29.7KN. Although the cable bead can withstand a large force, the elongation from yield to break is 55, which is relatively low.

[0138] When the yield strength ratio is 70% or 75%, the elongation of the cable bead from yield to fracture is relatively large, but the breaking force at the yield point is 24.75 or 23.1 kN, indicating that the cable bead can not withstand a large force.

[0139] Therefore, a yield strength ratio of 80%-85% can ensure both the effective utilization of the strength of the outer winding and a high safety factor. Based on comprehensive evaluation, the optimal yield strength ratio of the outer winding is 80-85%.

[0140] 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 manufacturing a cable-type bead for passenger car tires capable of prediction, characterized in that: Includes the following steps: Step 1: Adjust the yield strength ratio of the qualified outer winding wire using a straightening tool (3) to control the yield strength ratio of the outer winding wire to be 70%-90%; the straightening wheel in the straightening tool (3) is pressed in 0-3mm, and the straightening tool (3) is pressed in a way that the pressing force decreases from top to bottom; finally, the adjusted outer winding wire is obtained. The straightening tool (3) includes a left row of straightening wheels (31) and a right row of straightening wheels (32) capable of moving in opposite directions. The left row of straightening wheels (31) and the right row of straightening wheels (32) are arranged alternately in the vertical direction, and the outer winding wire passes between the left row of straightening wheels (31) and the right row of straightening wheels (32) from top to bottom. The straightening tool (3) decreases its pressing force from top to bottom in the following manner: the straightening wheel in the first part presses in 2-3 mm, the straightening wheel in the second part presses in 1-2 mm, the straightening wheel in the third part presses in 0.5-1 mm, the straightening wheel in the fourth part presses in 0-0.5 mm, and decreases from 0.5 mm to 0 mm. Step two involves winding the outer winding thread with the adjusted yield strength ratio onto the core ring in a spiral manner, according to the set twist pitch and twist direction.

2. The method for manufacturing a cable-type bead for passenger car tires capable of prediction as described in claim 1, characterized in that: The yield strength ratio of the outer winding thread is 80-85%.

3. The method for manufacturing a cable-type bead for passenger car tires capable of prediction as described in claim 1, characterized in that: The outer winding line is routed in a serpentine pattern in the straightening tool (3).

4. The method for manufacturing a cable-type bead for passenger car tires capable of prediction as described in claim 1, characterized in that: In step one, the diameter of the outer winding wire that meets the requirements is φ1.00mm-φ3.00mm.

5. The method for manufacturing a cable-type bead for passenger car tires capable of prediction as described in claim 1, characterized in that: In step two, the diameter of the core wire that meets the requirements is φ1.30mm-φ4.5mm.

6. The method for manufacturing a cable-type bead for passenger car tires capable of prediction as described in claim 1, characterized in that: The outer winding wire has a single, double, or triple layer structure, with each layer consisting of a single steel wire, and the ends are fixedly connected by a sleeve.

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