Low residual twist value bead wire drawing production apparatus and method

Abstract

The application relates to a low-residual-torsion-value bead wire drawing production device and method, and belongs to the technical field of wire drawing processing. From front to back, the device comprises a rotary die device, a heat treatment device, a straightening device and a lead pot tempering device. The rotary die device comprises a die mounting seat and a rotary die. The straightening device comprises a straightening wheel assembly, and the straightening wheel assembly is provided with a straightening wheel which can move forward and backward. The lead pot tempering device comprises a lead pot, and the input end of the lead pot is provided with an input driving wheel and a temporary storage device. The output end of the lead pot is provided with an output driving wheel. The steel wire internal stress is effectively released through the rotary die device. The heat treatment device avoids various adverse phenomena such as steel wire crossing and wire combining. The straightening device further controls the residual torsion value of the steel wire. The lead pot tempering device improves the tempering treatment efficiency of the steel wire, and is beneficial to eliminating the residual internal stress of the steel wire. Through the improvement of multiple processes, the steel wire residual torsion value is reduced, and the flatness of the product is improved.

Description

Technical Field

[0001] This invention relates to a production apparatus and method for drawing bead wire with low residual torsion value, belonging to the field of wire drawing technology. Background Technology

[0002] In radial tire steel wire skeleton materials, the tire bead serves to fix the tire to the rim, ensuring the tire's stability during vehicle operation. It also increases the lateral force distribution of the tire on the road surface, ensuring tire lifespan. The tire bead is made of rubber material mixed with steel wire, with the steel wire accounting for more than 85% of the weight. This steel wire is high-carbon bronze-plated steel wire. The steel wire and rubber are vulcanized together by chemically coating the surface of the steel wire, and then fixed into a ring shape by equipment.

[0003] The straightness of the steel wire during the coiling process has a significant impact on coiling. Poor or unstable straightness can lead to issues such as wire misalignment and irregular bead formation after coiling. The residual torsion value of the entire coiled steel wire has a substantial influence on the stability of straightness. The residual torsion value is an indicator of the overall eccentric force on the steel wire during coiling, and it is affected by various factors including the wire drawing process, the use of drawing dies, the effectiveness of wire drawing lubrication, and the control of heat treatment processes. Currently, adjusting the residual torsion of domestic bead steel wire, especially wire with a diameter of less than 1mm, is quite cumbersome, and the stability of the residual torsion value cannot be effectively controlled, thus affecting the straightness of the finished product. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a production device and method for drawing bead wire with low residual torsion value, which reduces the residual torsion value of the wire and improves the straightness of the product through the improvement of multiple processes.

[0005] The low residual torsion value tire bead wire drawing production device of the present invention includes, from front to back, a rotary mold device, a heat treatment device, a straightening device and a lead pot tempering device.

[0006] The rotary die device includes a die mounting base and a rotary die, which are rotatably connected to the die mounting base. The die mounting base is provided with a wire drawing powder chamber and a cooling chamber. The wire drawing powder chamber is filled with wire drawing powder, which lubricates the steel wire to be drawn to ensure smooth wire drawing. The rotary die is located in the cooling chamber, which is connected to a coolant via a pipe. The coolant cools the rotary die to prevent it from failing due to high temperature.

[0007] The mold mounting base is rotatably connected to a worm gear, one end of which is connected to a mold rotary motor. A worm wheel is fitted on the rotary mold, and the worm wheel meshes with the worm gear. The mold rotary motor can drive the worm gear to rotate, which in turn drives the worm wheel to rotate, thereby causing the rotary mold to rotate.

[0008] The straightening device includes at least eight sets of identical straightening wheel assemblies, arranged in two columns and multiple rows, mirror-mounted on the straightening workbench; two straightening wheel assemblies in each row form a pair, and the rows spaced apart form a group, for a total of two groups; each straightening wheel assembly is equipped with a straightening wheel that can move back and forth, and each group of straightening wheel assemblies cooperates to straighten the steel wire, with the two groups working alternately. When one group is straightening the steel wire, the other group can be replaced or repaired without stopping production, avoiding continuous wear of the straightening wheels that affects the straightness of the steel wire; the straightening wheel is a V-grooved wheel;

[0009] The lead pot tempering device includes a lead pot. The input end of the lead pot is equipped with an input drive wheel and a temporary storage device, located between the input drive wheel and the lead pot. The temporary storage device is used to temporarily store the steel wire fed by the input drive wheel, extending the residence time of the front-end steel wire in the lead pot, improving the tempering effect, eliminating internal stress in the steel wire, and further reducing the residual torsion value of the steel wire. The output end of the lead pot is equipped with an output drive wheel. Both the input drive wheel and the output drive wheel are driven to rotate by a motor, with the output drive wheel rotating at a higher speed than the input drive wheel. The input drive wheel and the output drive wheel can pull the steel wire. The rear of the lead pot tempering device is also equipped with an integrated measuring and adjusting device for detecting and adjusting the tension of the steel wire.

[0010] Preferably, a stirring motor is also fixed on one side of the mold mounting base. The stirring motor is connected to the stirring rod for transmission. The stirring rod is rotatably mounted on the mold mounting base and passes through one side wall of the drawing powder chamber. The stirring motor can drive the stirring rod to rotate and stir the drawing powder in the drawing powder chamber to prevent the drawing powder from caking.

[0011] Preferably, the straightening wheel assembly includes a cylinder, which is fixedly connected to the straightening worktable via a cylinder mounting seat. A movable support is fixed to the end of the cylinder rod, and a straightening wheel is rotatably mounted on the top of the movable support. The two sides of the movable support are slidably connected to the cylinder mounting seat via guide rods, which guide and limit the movable support to prevent vibration when the straightening wheel moves back and forth.

[0012] Preferably, the heat treatment apparatus includes a heat treatment open flame furnace, and a wire separating frame is fixed inside the heat treatment open flame furnace. The wire separating frame can separate each wire from each other to avoid the wires crossing or getting tangled, so that the internal structure of the wires is more stable after heat treatment, thereby reducing the residual stress of the wires after heat treatment and facilitating further drawing.

[0013] The wire splitting frame includes a fixed frame, and multiple wire splitting plates are arranged in an array above the fixed frame. Several through holes are opened on the wire splitting plates to allow steel wires to pass through, and the through holes at corresponding positions on each wire splitting plate are coaxially arranged.

[0014] Preferably, the lead pot contains multiple sets of guide wheels, which are alternately arranged vertically to increase the extension distance of the steel wire within the lead pot. The temporary storage device includes a lifting bracket with lifting wheels movably mounted on it. A lifting motor is installed on the top of the lifting bracket, and lead screws are installed on both sides of the lifting bracket. Lead screws are driven by lead screw nuts, and the axles of the lifting wheels are fixedly connected to the lead screw nuts on both sides. The lifting motor is connected to the lead screws on both sides via belts and pulleys, and the lifting motor can drive the lifting wheels to move up and down.

[0015] The low residual torsion value tire bead wire drawing production method of the present invention includes the following steps:

[0016] S1. When the steel wire enters the rotary die device and passes through the drawing powder chamber, the drawing powder used for lubrication adheres to the surface of the steel wire. Then it passes through the rotary die, and after being squeezed and deformed by the rotary die, the residual internal stress is effectively released, eliminating the various bias forces remaining inside the steel wire, and reducing the deviation of the steel wire diameter during the drawing process. The rotary die can also avoid the die from rapid wear due to continuous local stress, thus extending the service life of the die.

[0017] The sizing zone height of the rotary die is determined by the working area angle 2β, the exit angle 2γ, and the target diameter of the steel wire. To implement control, the specific steps are as follows:

[0018] S11. Using a conical grinding needle with a cone angle of 2β, the working area of ​​the rotating mold is ground into a cone shape, the minimum diameter of which is... , The calculation formula is:

[0019]

[0020] in, To determine the target diameter of the steel wire to be produced, β is half of the working area angle, which is empirically taken as 10°; γ is half of the exit angle, which is empirically taken as 30°.

[0021] S12, using a diameter of The cylindrical grinding process involves secondary grinding of the working area of ​​the rotating mold to obtain a diameter of... A sizing belt with a height of h;

[0022] S2. After being drawn, the steel wire enters the heat treatment device for heat treatment. During the heat treatment process, the steel wire passes through the wire separating frame, which separates the steel wires in the furnace from each other to avoid various adverse phenomena such as wire crossing and wire bundling. This makes the internal structure of the steel wire more stable after heat treatment, thereby reducing the residual stress of the steel wire after heat treatment and facilitating subsequent processing.

[0023] S3. The heat-treated steel wire enters the straightening device, which controls the residual torsion of the steel wire. The straightening wheel with the corresponding groove width and V-groove angle is designed according to the steel wire specifications to further control the value of the residual torsion of the steel wire.

[0024] Each straightening wheel assembly works in conjunction to straighten the steel wire. The two sets work alternately; while one set is straightening the steel wire, the other set is idle. When the working straightening wheel assembly reaches the end of its service life and needs to be replaced, the cylinder of the idle straightening wheel assembly is activated, bringing the corresponding straightening wheel close to the steel wire. Then, the cylinder of the working straightening wheel assembly moves the corresponding straightening wheel away from the steel wire for replacement or repair. This allows for the replacement or repair of straightening wheels without interrupting production, avoiding continuous wear of the straightening wheels that affects the straightness of the steel wire, and preventing disruption to normal production.

[0025] S4. The straightened steel wire enters the lead pot tempering device and passes through the input drive wheel, temporary storage device, various guide wheels and output drive wheel in sequence. The steel wire is tempered at more than 400 degrees to eliminate its internal stress and keep the residual torsion of the steel wire stable. Among them, the input drive wheel continuously pulls the steel wire at a constant speed, the output drive wheel runs intermittently at a speed higher than the input drive wheel, and the lifting wheel of the temporary storage device moves up and down reciprocatingly.

[0026] Preferably, in step S3, the specific steps for designing the groove width of the straightening wheel are as follows:

[0027] A straightening wheel with a V-angle of 90° is selected. Let the groove width of the straightening wheel be L, the diameter of the steel wire be D, and the angle between the line connecting the center of the steel wire to one edge of the V-groove of the straightening wheel and the central plane of the straightening wheel be α. Based on past production experience, the range of α is 60° ≤ α ≤ 80°. Then:

[0028] tanα=

[0029] Therefore, 1.732≤ ≤5.67, calculated as: 1.72D≤L≤3.35D, that is, the range of values ​​for the groove width L.

[0030] Preferably, in step S4, when the output drive wheel stops, the lifting wheel of the temporary storage device moves downward under the action of the lifting motor, making the length of the steel wire between the input drive wheel and the lead pot longer, and temporarily storing the steel wire. At this time, the steel wire in the lead pot does not move. When the lifting wheel moves to the detection position below the lifting bracket, the output drive wheel moves, pulling the steel wire in the lead pot forward. At the same time, the lifting motor reverses, driving the lifting wheel to move upward to cooperate with the traction action of the output drive wheel, until the lifting wheel moves to the detection position above the lifting bracket. At this time, the steel wire is in a straight state, all the temporarily stored steel wire is consumed, the output drive wheel stops again, and the next cycle begins.

[0031] This movement method prolongs the residence time of the steel wire in the lead pot, improves the tempering efficiency, and helps eliminate the internal stress of the steel wire. At the same time, when the steel wire in the lead pot is suddenly started, it has a certain acceleration, which can shake off the molten wire drawing powder attached to the surface of the steel wire, reduce the residue on the surface of the steel wire, and avoid its impact on subsequent processes.

[0032] The beneficial effects of this invention compared to the prior art are:

[0033] The low residual torsion value tire bead wire drawing production device and method of the present invention effectively releases the internal stress of the steel wire through a rationally designed rotating die device, avoids various unfavorable phenomena such as wire crossing and wire bundling through a heat treatment device, further controls the residual torsion value of the steel wire through a straightening device, and improves the tempering efficiency of the steel wire through a lead pot tempering device, which is conducive to eliminating the residual internal stress of the steel wire. The present invention reduces the residual torsion value of the steel wire and improves the straightness of the product through improvements in multiple processes. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the rotating mold device;

[0035] Figure 2 This is a sectional view of the rotary mold assembly;

[0036] Figure 3 This is a cross-sectional view of the heat treatment apparatus;

[0037] Figure 4 This is a schematic diagram of the straightening device;

[0038] Figure 5 This is a schematic diagram illustrating the working principle of the lead pot tempering device and the tension measurement and adjustment integrated device.

[0039] Figure 6 This is the main view of the temporary storage device;

[0040] Figure 7 This is a schematic diagram of the integrated tension measurement and adjustment device;

[0041] Figure 8 This is a schematic diagram of the working state of the straight wheel;

[0042] Figure 9 This is a cross-sectional view of the rotary mold after processing in step S11;

[0043] Figure 10 This is a cross-sectional view of the rotary mold after processing in step S12.

[0044] In the diagram: 1. Rotary mold device; 11. Rotary mold; 12. Mold mounting base; 121. Wire drawing powder chamber; 122. Cooling chamber; 13. Stirring rod; 14. Stirring motor; 15. Mold rotary motor; 16. Worm gear; 17. Worm wheel; 2. Heat treatment device; 21. Heat treatment open flame furnace; 22. Wire separating frame; 221. Fixed frame; 222. Wire separating plate; 3. Straightening device; 31. Straightening workbench; 32. Straightening wheel assembly; 321. Straightening wheel; 322. Movable support; 323. Cylinder mounting. 324. Cylinder; 4. Lead pot tempering device; 41. Input drive wheel; 42. Temporary storage device; 421. Lifting motor; 422. Lifting bracket; 423. Lead screw; 424. Lead screw nut seat; 425. Lifting wheel; 43. Guide wheel; 44. Lead pot; 45. Output drive wheel; 5. Measurement and adjustment integrated device; 51. Tensioning wheel group; 52. Spring; 53. Guide rail slider assembly; 54. Tensioning support; 55. Electric cylinder; 56. Sliding plate; 57. Pressure sensor; 58. Guide column; 6. Steel wire. Detailed Implementation

[0045] Example 1

[0046] like Figures 1-7 As shown, the dry drawing steel wire surface residue removal device described in this embodiment includes, from front to back, a rotary mold device 1, a heat treatment device 2, a straightening device 3, and a lead pot tempering device 4.

[0047] The rotary mold device 1 includes a mold mounting base 12 and a rotary mold 11, which is rotatably connected to the mold mounting base 12. The mold mounting base 12 is provided with a wire drawing powder chamber 121 and a cooling chamber 122. The wire drawing powder chamber 121 is filled with wire drawing powder, which lubricates the steel wire 6 to be drawn to ensure smooth drawing of the steel wire 6. The rotary mold 11 is located in the cooling chamber 122, which is connected to a coolant through a pipe. The coolant cools the rotary mold 11 to prevent it from failing due to high temperature.

[0048] A worm gear 16 is rotatably connected to the mold mounting base 12. One end of the worm gear 16 is connected to the mold rotary motor 15. A worm wheel 17 is sleeved on the rotary mold 11. The worm wheel 17 meshes with the worm gear 16. The mold rotary motor 15 can drive the worm gear 16 to rotate, and then drive the worm wheel 17 to rotate through the worm gear 16, thereby causing the rotary mold 11 to rotate.

[0049] The straightening device 3 includes at least eight sets of straightening wheel assemblies 32 with identical structures. Each straightening wheel assembly 32 is arranged in two columns and multiple rows, and mirror-mounted on the straightening workbench 31. Two straightening wheel assemblies 32 in each row form a pair, and the rows that are spaced apart form a group, for a total of two groups. Each straightening wheel assembly 32 is equipped with a straightening wheel 321 that can move back and forth. Each group of straightening wheel assemblies 32 works together to straighten the steel wire 6. The two groups work alternately. When one group is straightening the steel wire 6, the other group can be replaced or repaired without stopping production, thus avoiding continuous wear of the straightening wheel 321 that affects the straightness of the steel wire 6. The straightening wheel 321 is a V-grooved wheel.

[0050] The lead pot tempering device 4 includes a lead pot 44. The input end of the lead pot 44 is provided with an input drive wheel 41 and a temporary storage device 42. The temporary storage device 42 is located between the input drive wheel 41 and the lead pot 44. The temporary storage device 42 is used to temporarily store the steel wire 6 fed by the input drive wheel, prolonging the residence time of the front end steel wire 6 in the lead pot 44, improving the tempering effect, eliminating the internal stress of the steel wire 6, and further reducing the residual torsion value of the steel wire 6. The output end of the lead pot is provided with an output drive wheel 45. Both the input drive wheel 41 and the output drive wheel 45 are driven to rotate by a motor. The rotation speed of the output drive wheel 45 is higher than that of the input drive wheel 41. The input drive wheel 41 and the output drive wheel 45 can pull the steel wire 6. The rear side of the lead pot tempering device 4 is also provided with a measuring and adjusting integrated device 5 for detecting and adjusting the tension of the steel wire.

[0051] In this embodiment, a stirring motor 14 is also fixed on one side of the mold mounting base 12. The stirring motor 14 is connected to the stirring rod 13. The stirring rod 13 is rotatably mounted on the mold mounting base 12 and passes through one side wall of the drawing powder chamber 121. The stirring motor 14 can drive the stirring rod 13 to rotate and stir the drawing powder in the drawing powder chamber 121 to avoid the drawing powder from caking.

[0052] The straightening wheel assembly 32 includes a cylinder 324, which is fixedly connected to the straightening worktable 31 via a cylinder mounting base 323. A movable support 322 is fixed to the end of the cylinder rod, and a straightening wheel 321 is rotatably mounted on the top of the movable support 322. The two sides of the movable support 322 are slidably connected to the cylinder mounting base 323 via guide rods. The guide rods guide and limit the movable support 322 to prevent vibration when the straightening wheel 321 moves back and forth.

[0053] The heat treatment device 2 includes a heat treatment open flame furnace 21. A wire separating frame 22 is fixed inside the heat treatment open flame furnace 21. The wire separating frame 22 can separate each steel wire 6 from each other to avoid the steel wires 6 crossing or twisting. This makes the internal structure of the steel wire 6 more stable after heat treatment, thereby reducing the residual stress of the steel wire 6 after heat treatment and facilitating further drawing.

[0054] The wire splitting frame 22 includes a fixed frame 221. Multiple wire splitting plates 222 are arranged in an array above the fixed frame 221. Several through holes are opened on the wire splitting plates 222 to allow the steel wires 6 to pass through. The through holes at corresponding positions on each wire splitting plate 222 are coaxially arranged.

[0055] The lead pot 44 is fixed with multiple sets of guide wheels 43, which are arranged alternately up and down to increase the extension distance of the steel wire 6 in the lead pot 44. The temporary storage device 42 includes a lifting bracket 422, on which lifting wheels 425 are movably arranged. A lifting motor 421 is installed on the top of the lifting bracket 422. Lead screws 423 are installed on both sides of the lifting bracket 422. Lead screws 424 are driven on the lead screws 423. The two ends of the wheel axle of the lifting wheel 425 are fixedly connected to the lead screws 424 on both sides. The lifting motor 421 is connected to the lead screws 423 on both sides through belt and pulley transmission. The lifting motor 421 can drive the lifting wheel 425 to move up and down.

[0056] The integrated measurement and adjustment device 5 includes a tensioning support 54, on which an electric cylinder 55 is fixed. The first end of the electric cylinder rod is fixedly connected to a sliding plate 56. The two sides of the sliding plate 56 are slidably connected to the tensioning support 54 through a guide rail slider assembly 53. A pressure sensor 57 is fixedly fixed on the sliding plate 56. The pressure sensor 57 is fixedly connected to one end of a spring 52. The other end of the spring 52 is fixedly connected to a tensioning wheel assembly 51. Guide posts 58 are fixed on both sides of the tensioning wheel assembly 51. The tensioning wheel assembly 51 is slidably connected to the sliding plate 56 through the guide posts 58, and the guide posts 58 guide and limit the tensioning wheel assembly 51.

[0057] When the integrated measurement and adjustment device 5 is working, the electric cylinder 55 pushes the sliding plate 56 to move horizontally. The sliding plate 56 pushes the tensioning wheel assembly 51 to move horizontally via the spring 52, contacting and pushing the steel wire 6 to form a certain tension. The tension of the steel wire 6 is adjusted by the electric cylinder 55 pushing the sliding plate 56 to compress or release the spring 52. The tension value is measured by the pressure sensor 57 and fed back to the control system. The control system then adjusts the electric cylinder 55 according to the set tension and the measured tension until the set tension value is reached, ensuring that the steel wire 6 maintains a reasonable tension throughout the production process. The control system model is LE-30CTN / LE-30CTA.

[0058] The elastic force generated by the spring 52 when compressed to its limit does not exceed the maximum value of the design tension of the steel wire 6. By setting the spring 52, the sliding plate 56 is elastically connected to the tensioning wheel assembly 51, so as to avoid the steel wire 6 from deforming or breaking due to rigid contact between the tensioning wheel assembly 51 and the steel wire 6.

[0059] Example 2

[0060] like Figures 8-10 As shown, the low residual torsion value tire bead wire drawing production method described in this embodiment includes the following steps:

[0061] S1. When the steel wire 6 enters the rotary die device 1 and passes through the drawing powder chamber 121, drawing powder for lubrication adheres to the surface of the steel wire 6. Then it passes through the rotary die 11. After being squeezed and deformed by the rotary die 11, the residual stress inside is effectively released, eliminating the various bias forces remaining inside the steel wire 6, and reducing the deviation of the steel wire diameter during the drawing process. The rotary die 11 can also avoid the die from rapid wear due to continuous local stress, thus extending the service life of the die.

[0062] The sizing zone height of the rotary die 11 passes through the working area angle 2β, the exit angle 2γ, and the target diameter of the steel wire. To implement control, the specific steps are as follows:

[0063] S11. Using a conical grinding needle with a cone angle of 2β, the working area of ​​the rotating mold 11 is ground into a cone shape, the minimum diameter of which is... , The calculation formula is:

[0064]

[0065] in, For the target diameter of the steel wire 6 to be produced, β is half of the working area angle, which is empirically taken as 10°; γ is half of the exit angle, which is empirically taken as 30°.

[0066] S12, using a diameter of The cylindrical grinding process involves secondary grinding of the working area of ​​the rotating mold 11 to obtain a diameter of... A sizing belt with a height of h;

[0067] Controlling the height of the sizing belt in this way can prevent the sizing belt from being too long, which would increase the internal stress of the steel wire 6 and lead to increased residual torsion. At the same time, it can also prevent the sizing belt from being too short and causing rapid wear.

[0068] S2. After being drawn, the steel wire 6 enters the heat treatment device 2 for heat treatment. During the heat treatment process, the steel wire 6 passes through the wire separating frame 22, which separates the steel wires 6 in the furnace from each other, avoiding various unfavorable phenomena such as crossing and twisting of the steel wires 6. This makes the internal structure of the steel wire 6 more stable after heat treatment, thereby reducing the residual stress of the steel wire 6 after heat treatment and facilitating subsequent processing.

[0069] S3. The heat-treated steel wire 6 enters the straightening device 3, which controls the residual torsion of the steel wire 6. The straightening device 3 controls the residual torsion of the steel wire 6. The straightening wheel 321 with the corresponding groove width and V-groove angle is designed according to the specifications of the steel wire 6 to further control the residual torsion value of the steel wire 6.

[0070] Each set of straightening wheel assemblies 32 works in conjunction to straighten the steel wire 6. The two sets work alternately. When one set is straightening the steel wire 6, the other set is idle. When the working straightening wheel assembly 32 reaches the end of its service life and needs to be replaced, the cylinder 324 of the idle straightening wheel assembly 32 is activated, bringing the corresponding straightening wheel 321 close to the steel wire 6. Then, the cylinder 324 of the working straightening wheel assembly 32 moves the corresponding straightening wheel 321 away from the steel wire 6 for replacement or repair. This allows for the replacement or repair of the straightening wheel 321 without interrupting production, avoiding continuous wear of the straightening wheel 321 that affects the straightness of the steel wire 6, and also avoiding disruption to normal production.

[0071] S4. The straightened steel wire 6 enters the lead pot tempering device 4 and passes through the input drive wheel 41, temporary storage device 42, each set of guide wheels 43 and output drive wheel 45 in sequence. The steel wire 6 is tempered at more than 400 degrees to eliminate its internal stress and keep its residual torsion stable. Among them, the input drive wheel 41 continuously pulls the steel wire 6 at a constant speed, the output drive wheel 45 runs intermittently at a speed higher than that of the input drive wheel 41, and the lifting wheel 425 of the temporary storage device 42 moves up and down reciprocatingly.

[0072] In step S3, the specific steps for designing the groove width of the straightening wheel 321 are as follows:

[0073] A straightening wheel 321 with a V-angle of 90° is selected. Let the groove width of the straightening wheel 321 be L, the diameter of the steel wire 6 be D, and the angle between the line connecting the center of the steel wire 6 to one edge of the V-groove of the straightening wheel 321 and the central plane of the straightening wheel 321 be α. Based on past production experience, the value of α ranges from 60° ≤ α ≤ 80°. Then:

[0074] tanα=

[0075] Therefore, 1.732≤ ≤5.67, calculated as: 1.72D≤L≤3.35D, which is the range of values ​​for the groove width L. Any V-groove within this range can be selected.

[0076] In step S4, when the output drive wheel 45 stops, the lifting wheel 425 of the temporary storage device 42 moves downward under the action of the lifting motor 421, making the length of the steel wire 6 between the input drive wheel 41 and the lead pot 44 longer, temporarily storing the steel wire 6. At this time, the steel wire 6 in the lead pot 44 remains stationary. When the lifting wheel 425 moves to the lower detection position of the lifting bracket 422, the output drive wheel 45 actuates, pulling the steel wire 6 in the lead pot 44 forward. At the same time, the lifting motor 421 reverses, driving the lifting wheel 425 to move upward to cooperate with the pulling action of the output drive wheel 45, until the lifting wheel 425 moves to the upper detection position of the lifting bracket 422. At this time, the steel wire 6 is in a straight state, all the temporarily stored steel wire 6 is consumed, the output drive wheel 45 stops again, and the next cycle begins. Both the lower and upper detection positions are equipped with proximity switches.

[0077] This motion method prolongs the residence time of the steel wire 6 in the lead pot 44, improves the tempering efficiency, and helps to eliminate the internal stress of the steel wire 6. At the same time, when the steel wire 6 in the lead pot 44 is suddenly started, it has a certain acceleration, which can shake off the molten wire drawing powder adhering to the surface of the steel wire 6, reduce the residue on the surface of the steel wire 6, and avoid its impact on subsequent processes.

Claims

1. A low residual torsion value tire bead wire drawing production device, characterized in that, From front to back, it includes a rotating mold device (1), a heat treatment device (2), a straightening device (3), and a lead pot tempering device (4); the lead pot tempering device (4) is also provided with a measuring and adjusting integrated device (5) for detecting and adjusting the tension of the steel wire. The rotary mold device (1) includes a mold mounting base (12) and a rotary mold (11), the rotary mold (11) being rotatably connected to the mold mounting base (12); the mold mounting base (12) is provided with a wire drawing powder chamber (121) and a cooling chamber (122), the rotary mold (11) being located in the cooling chamber (122); The mold mounting base (12) is rotatably connected to a worm (16), one end of which is connected to a mold rotary motor (15) for transmission. The rotary mold (11) is fitted with a worm wheel (17), which meshes with the worm (16). The straightening device (3) includes at least eight sets of straightening wheel assemblies (32) with the same structure. Each straightening wheel assembly (32) is arranged in two columns and multiple rows and mirrored on the straightening workbench (31). Two straightening wheel assemblies (32) in each row form a pair, and the rows that are spaced apart from each other form a group, for a total of two groups. The lead pot tempering device (4) includes a lead pot (44), and the input end of the lead pot (44) is provided with an input drive wheel (41) and a temporary storage device (42), and the temporary storage device (42) is located between the input drive wheel (41) and the lead pot (44); The lead pot (44) is provided with an output drive wheel (45) at the output end. Both the input drive wheel (41) and the output drive wheel (45) are driven to rotate by a motor. The speed of the output drive wheel (45) is higher than that of the input drive wheel (41). The lead pot (44) is fixed with multiple sets of guide wheels (43), and each set of guide wheels (43) is arranged alternately up and down; the temporary storage device (42) includes a lifting bracket (422), a lifting wheel (425) is movably arranged on the lifting bracket (422), a lifting motor (421) is installed on the top of the lifting bracket (422), and lead screws (423) are installed on both sides of the lifting bracket (422). A lead screw nut (424) is driven on the lead screw (423), and the two ends of the wheel axle of the lifting wheel (425) are fixedly connected to the lead screw nut (424) on both sides; the lifting motor (421) and the lead screws (423) on both sides are connected by belt and pulley transmission. The straightened steel wire (6) enters the lead pot tempering device (4) and passes through the input drive wheel (41), temporary storage device (42), each set of guide wheels (43) and output drive wheel (45) in sequence to temper the steel wire (6) at a temperature of more than 400 degrees to eliminate its internal stress and keep the residual torsion of the steel wire (6) stable. Among them, the input drive wheel (41) continuously pulls the steel wire (6) at a constant speed, the output drive wheel (45) runs intermittently at a speed higher than that of the input drive wheel (41), and the lifting wheel (425) of the temporary storage device (42) moves up and down.

2. The low residual torsion value bead wire drawing production apparatus according to claim 1, characterized in that, A stirring motor (14) is also fixed on one side of the mold mounting base (12). The stirring motor (14) is connected to the stirring rod (13) in a transmission. The stirring rod (13) is rotatably mounted on the mold mounting base (12) and passes through one side wall panel of the drawing powder chamber (121).

3. The low residual torsion value bead wire drawing production apparatus according to claim 1, characterized in that, The straightening wheel assembly (32) is equipped with straightening wheels (321) that can move back and forth. Each set of straightening wheel assemblies (32) cooperates with each other to straighten the steel wire (6), and the two sets work alternately. The straightening wheel assembly (32) includes a cylinder (324), which is fixedly connected to the straightening worktable (31) via a cylinder mounting seat (323). A movable support (322) is fixed at the end of the cylinder rod, and a straightening wheel (321) is rotatably mounted on the top of the movable support (322). The two sides of the movable support (322) are slidably connected to the cylinder mounting seat (323) via guide rods.

4. The low residual torsion value bead wire drawing production apparatus according to claim 1, characterized in that, The heat treatment device (2) includes a heat treatment open flame furnace (21), and a wire splitting frame (22) is fixed inside the heat treatment open flame furnace (21). The wire splitting frame (22) includes a fixed frame (221), and multiple wire splitting plates (222) are arranged in an array above the fixed frame (221). Several through holes are opened on the wire splitting plates (222) to allow steel wires to pass through. The through holes at corresponding positions on each wire splitting plate (222) are coaxially arranged.

5. A method for producing low residual torsion value tire bead wire by drawing, characterized in that, Includes the following steps: S1. When the steel wire (6) enters the rotary die device (1) and passes through the drawing powder chamber (121), the drawing powder used for lubrication adheres to the surface of the steel wire (6); then it passes into the rotary die (11). After being squeezed and deformed by the rotary die (11), the residual stress inside is effectively released, the residual bias forces inside the steel wire (6) are eliminated, and the deviation of the steel wire diameter during the drawing process is reduced. The rotary die (11) can also avoid the die from rapid wear due to continuous local stress, thus extending the service life of the die. The sizing zone height of the rotary die (11) is controlled by the working area angle 2β, the exit angle 2γ, and the target diameter of the steel wire. The specific steps are as follows: S11. Using a conical grinding needle with a cone angle of 2β, the working area of ​​the rotating mold (11) is ground into a cone shape, the minimum diameter of which is , The calculation formula is: in, For the target diameter of the steel wire (6) to be produced, β is half of the working area angle, which is taken as 10° based on experience; γ is half of the exit angle, which is taken as 30° based on experience. S12, using a diameter of The cylindrical grinding is performed on the working area of ​​the rotating mold (11) to obtain a diameter of A sizing belt with a height of h; S2. After being drawn, the steel wire (6) enters the heat treatment device (2) for heat treatment. During the heat treatment process, the steel wire (6) passes through the wire separating frame (22). The wire separating frame (22) separates the steel wires (6) in the furnace from each other, avoiding the phenomenon of steel wires (6) crossing or tangling. This makes the internal structure of the steel wire (6) more stable after heat treatment, thereby reducing the residual stress of the steel wire after heat treatment and facilitating subsequent processing. S3. The heat-treated steel wire (6) enters the straightening device (3), and the straightening device (3) controls the residual torsion of the steel wire (6); according to the specifications of the steel wire (6), a straightening wheel (321) with corresponding groove width and V-groove angle is designed to further control the residual torsion value of the steel wire (6); Each straightening wheel assembly (32) works together to straighten the steel wire (6). The two sets work alternately. When one set is straightening the steel wire (6), the other set is idle. When the working straightening wheel assembly (32) reaches the end of its service life and needs to be replaced, the cylinder (324) of the idle straightening wheel assembly (32) is activated, so that the corresponding straightening wheel (321) is close to the steel wire (6). Then the cylinder (324) of the working straightening wheel assembly (32) moves the corresponding straightening wheel (321) away from the steel wire (6) for replacement or repair. S4. The straightened steel wire (6) enters the lead pot tempering device (4) and passes through the input drive wheel (41), temporary storage device (42), each set of guide wheels (43) and output drive wheel (45) in sequence to temper the steel wire (6) at a temperature of more than 400 degrees to eliminate its internal stress and keep the residual torsion of the steel wire (6) stable. Among them, the input drive wheel (41) continuously pulls the steel wire (6) at a constant speed, the output drive wheel (45) runs intermittently at a speed higher than that of the input drive wheel (41), and the lifting wheel (425) of the temporary storage device (42) moves up and down.

6. The method for producing low residual torsion value bead wire according to claim 5, characterized in that, In step S3, the specific steps for designing the groove width of the straightening wheel (321) are as follows: A straightening wheel (321) with a V-angle of 90° is selected. Let the groove width of the straightening wheel (321) be L, the diameter of the steel wire (6) be D, and the angle between the line connecting the center of the steel wire (6) to one edge of the V-groove of the straightening wheel (321) and the central plane of the straightening wheel (321) be α. Based on past production experience, the value of α is in the range of 60°≤α≤80°. Then: tanα= Therefore, 1.732≤ ≤5.67, calculated as: 1.72D≤L≤3.35D, that is, the range of values ​​for the groove width L.

7. The method for producing low residual torsion value bead wire according to claim 5, characterized in that, In step S4, when the output drive wheel (45) stops, the lifting wheel (425) of the temporary storage device (42) moves downward under the action of the lifting motor (421), making the length of the steel wire (6) between the input drive wheel (41) and the lead pot (44) longer, and temporarily storing the steel wire (6). At this time, the steel wire (6) in the lead pot (44) does not move. When the lifting wheel (425) moves to the lower detection position of the lifting bracket (422), the output drive wheel (45) moves and pulls the steel wire (6) in the lead pot (44) forward. At the same time, the lifting motor (421) reverses and drives the lifting wheel (425) to move upward to cooperate with the traction action of the output drive wheel (45) until the lifting wheel (425) moves to the upper detection position of the lifting bracket (422). At this time, the steel wire (6) is in a straight state, all the temporarily stored steel wire (6) is consumed, the output drive wheel (45) stops again, and enters the next cycle.

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