Method and equipment for designing curved hole of bare copper wire drawing die

Abstract

The invention is suitable for the technical field of industrial robots, and particularly relates to a method and equipment for designing a curved hole of a bare copper wire drawing die, and the method comprises the steps: obtaining an initial diameter, a target diameter and a material parameter of a bare copper wire; based on the initial diameter of the bare copper wire and the copper wire friction coefficient, obtaining an inlet area parameter of the wire drawing die; based on the inlet area angle, the inlet area length, the target diameter and the material plasticity parameters of the bare copper wire, diameter reducing area parameters of the wire drawing die are determined; determining outlet area parameters of the wire drawing die based on the diameter reducing area parameters of the wire drawing die and the copper wire rebound coefficient; according to the inlet area parameters, the reducing area parameters, the target sizing area parameters and the outlet area parameters, a curve type hole contour equation set of the wire drawing die is constructed; and based on the curve type hole contour equation set, designing the curve type hole of the wire drawing die of the bare copper wire. By means of the method, the problem that the material is not matched with the curve type hole parameters, and consequently the wire breaking rate is high can be solved.

Description

Technical Field

[0001] This application belongs to the field of metal plastic processing technology, and in particular relates to the design method and equipment for curved hole of bare copper wire drawing die. Background Technology

[0002] Wire drawing dies have a wide range of applications. High-precision wires used in electronic devices, radar, television, instruments and aerospace, as well as commonly used tungsten wire, molybdenum wire, stainless steel wire, wire and cable wire and various alloy wires are all drawn using wire drawing dies.

[0003] Traditional wire drawing die design methods do not link plasticity parameters, springback coefficients and hole parameters, and use uniform parameters to adapt to all materials. High plasticity copper wire is prone to excessive deformation, and high springback copper wire has a large springback in finished size. There is a mismatch between material and curved hole parameters, resulting in a high wire breakage rate. Summary of the Invention

[0004] This application provides a method and equipment for designing curved holes in bare copper wire drawing dies, which can solve the problem of high wire breakage rate caused by mismatch between material and curved hole parameters.

[0005] In a first aspect, embodiments of this application provide a method for designing curved holes in bare copper wire drawing dies, including: Obtain the initial diameter, target diameter, and material parameters of the bare copper wire; wherein, the material parameters include the material plasticity parameter, springback coefficient, and friction coefficient of the bare copper wire; Based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire, the inlet region parameters of the wire drawing die are obtained; wherein, the inlet region parameters reflect the inlet region angle and the inlet region length; Based on the entrance region angle, the entrance region length, the target diameter, and the material plasticity parameters of the bare copper wire, the diameter reduction region parameters of the wire drawing die are determined; Based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire, the exit zone parameters of the wire drawing die are determined. Based on the inlet area parameters, the reduction area parameters, the target sizing area parameters, and the outlet area parameters, a set of equations for the curved hole profile of the wire drawing die is constructed; wherein, the set of equations for the curved hole profile is a multi-segment set of equations; the target sizing area parameters include a preset sizing area length and a preset sizing area diameter tolerance, wherein the sizing area diameter is equal to the target diameter; Based on the aforementioned set of curved hole contour equations, the curved hole of the wire drawing die for the bare copper wire is designed.

[0006] The technical solutions described in this application embodiment have at least the following technical effects: The method for designing curved holes in bare copper wire drawing dies provided in this application involves obtaining the initial diameter, target diameter, and material parameters of the bare copper wire. The material parameters include the plasticity parameters, springback coefficient, and friction coefficient of the bare copper wire. Based on the initial diameter and friction coefficient, the entry zone parameters of the drawing die are obtained, reflecting the entry zone angle and length. Based on the entry zone angle, length, target diameter, and plasticity parameters, the reduction zone parameters are determined. Based on the reduction zone parameters and springback coefficient, the exit zone parameters are determined. According to the entry zone parameters, reduction zone parameters, target sizing zone parameters, and exit zone parameters, a set of curved hole contour equations for the drawing die is constructed. This set of equations is a multi-segment equation set. The target sizing zone parameters include a preset sizing zone length and a preset sizing zone diameter tolerance, where the sizing zone diameter equals the target diameter. Based on the curved hole contour equations, the curved hole of the bare copper wire drawing die is designed. This application obtains the initial diameter, target diameter, and material parameters of the bare copper wire, systematically considers the material parameters of the bare copper wire, and obtains the corresponding inlet region parameters, reduction region parameters, target sizing region parameters, and outlet region parameters. Based on these parameters, a set of equations for the curved hole profile of the wire drawing die is constructed. Finally, the curved hole of the wire drawing die is designed to ensure that the final curved hole corresponds to the material parameters, thereby reducing the wire breakage rate. This method solves the problem of high wire breakage rates caused by mismatch between material and curved hole parameters.

[0007] Secondly, embodiments of this application provide a curved hole design system for bare copper wire drawing dies, applied to electronic devices, for implementing the curved hole design method for bare copper wire drawing dies described in any one of the first aspects above. The curved hole design system for bare copper wire drawing dies includes: The acquisition unit is used to acquire the initial diameter, target diameter, and material parameters of the bare copper wire; wherein, the material parameters include the material plasticity parameter, springback coefficient, and friction coefficient of the bare copper wire. An inlet unit is used to obtain inlet zone parameters of the wire drawing die based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire; the inlet zone parameters reflect the inlet zone angle and the inlet zone length; A diameter reduction unit is used to determine the diameter reduction parameters of the wire drawing die based on the inlet region parameters, the target diameter, and the material plasticity parameters of the bare copper wire. An exit unit is used to determine the exit zone parameters of the wire drawing die based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire. An equation unit is used to construct a set of equations for the curved hole profile of the wire drawing die based on the inlet region parameters, the reduction region parameters, the target sizing region parameters, and the outlet region parameters; wherein the set of equations for the curved hole profile is a multi-segment set of equations; the target sizing region parameters include a preset sizing region length and a preset sizing region diameter tolerance, wherein the sizing region diameter is equal to the target diameter; The design unit is used to design the curved hole of the drawing die for the bare copper wire based on the curved hole profile equation set.

[0008] Thirdly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method as described in any of the foregoing aspects.

[0009] Fourthly, embodiments of this application provide a computer program product that, when run on an electronic device, causes the electronic device to perform the method described in any one of the first aspects above.

[0010] It is understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a flowchart illustrating the method for designing curved holes in a bare copper wire drawing die according to an embodiment of this application. Figure 2 This is a schematic diagram illustrating the operation of a curved hole design method for bare copper wire drawing die provided in an embodiment of this application; Figure 3 This is a cross-sectional schematic diagram of the wire drawing die provided in the embodiments of this application.

[0013] Figure 4 This is a top view schematic diagram of the wire drawing die provided in the embodiments of this application.

[0014] Figure 5 This is a schematic diagram of the curved hole design system for bare copper wire drawing dies provided in this application embodiment; Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0015] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0016] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0017] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0018] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0019] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0021] Traditional wire drawing die design methods in related technologies do not correlate plasticity parameters, springback coefficients, and hole parameters. They use uniform parameters to suit all materials, leading to excessive deformation in high-plasticity copper wires and significant dimensional springback in high-springback copper wires. This mismatch between material properties and curved hole parameters results in a persistently high wire breakage rate. For example, under the same reduction ratio, different material parameters require different wire drawing dies. High-plasticity or high-springback copper wires, in particular, require specific curved hole parameters. Traditional methods simply use dies with a uniform reduction ratio and adjust equipment operating parameters for drawing, resulting in a mismatch between material parameters and curved hole parameters, leading to a persistently high wire breakage rate.

[0022] To address the aforementioned issues, embodiments of this application provide a method and equipment for designing curved holes in bare copper wire drawing dies. This method involves obtaining the initial diameter, target diameter, and material parameters of the bare copper wire. The material parameters include the copper wire's plasticity, springback coefficient, and friction coefficient. Based on the initial diameter and friction coefficient, the entry zone parameters of the drawing die are obtained, reflecting the entry zone angle and length. Based on the entry zone angle, length, target diameter, and copper wire's plasticity, the reduction zone parameters are determined. Based on the reduction zone parameters and springback coefficient, the exit zone parameters are determined. According to the entry zone parameters, reduction zone parameters, target sizing zone parameters, and exit zone parameters, a set of curved hole contour equations for the drawing die is constructed. This set of curved hole contour equations is a multi-segment equation set. The target sizing zone parameters include a preset sizing zone length and a preset sizing zone diameter tolerance, where the sizing zone diameter equals the target diameter. Based on the curved hole contour equations, the curved hole of the bare copper wire drawing die is designed. This application obtains the initial diameter, target diameter, and material parameters of the bare copper wire, systematically considers the material parameters of the bare copper wire, and obtains the corresponding inlet region parameters, reduction region parameters, target sizing region parameters, and outlet region parameters. Based on these parameters, a set of equations for the curved hole profile of the wire drawing die is constructed. Finally, the curved hole of the wire drawing die is designed to ensure that the final curved hole corresponds to the material parameters, thereby reducing the wire breakage rate. This method solves the problem of high wire breakage rates caused by mismatch between material and curved hole parameters.

[0023] The method for designing curved holes in bare copper wire drawing dies provided in this application can be applied to electronic devices. In this case, the electronic device is the executing entity of the method for designing curved holes in bare copper wire drawing dies provided in this application. This application does not impose any restrictions on the specific type of electronic device.

[0024] For example, electronic devices can be industrial control computers, edge computing gateways, production scheduling servers, cloud servers, industrial tablets, or intelligent scheduling terminals. Electronic devices include memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the methods described in any of the foregoing aspects.

[0025] To better understand the curved hole design method for bare copper wire drawing dies provided in this application embodiment, the specific implementation process of the curved hole design method for bare copper wire drawing dies provided in this application embodiment will be described by way of example below.

[0026] Figure 1 A flowchart illustrating the method for designing curved holes in bare copper wire drawing dies provided in an embodiment of this application is shown. Figure 2 This illustration shows a schematic diagram of the operation of the curved hole design method for bare copper wire drawing dies provided in an embodiment of this application. The curved hole design method for bare copper wire drawing dies includes: S100: Obtain the initial diameter, target diameter, and material parameters of the bare copper wire. The material parameters include the plasticity parameter, springback coefficient, and friction coefficient of the bare copper wire.

[0027] The initial diameter refers to the diameter of the bare copper wire before drawing, which can be obtained by averaging three different cross-sections measured with a micrometer. For example, the initial diameter of the bare copper wire is measured to be 2.0 mm. The target diameter refers to the diameter of the bare copper wire to be drawn from the initial diameter, which can be obtained by pre-inputting it into an electronic device. For example, the preset target diameter is 1.0 mm. The material parameters represent the relevant performance parameters of the bare copper wire to be drawn, which directly affect the drawing deformation effect and the mold compatibility. Among them, the material plasticity parameter can be characterized by the material plasticity parameter n (reflecting the copper wire's ability to resist plastic deformation), the copper wire springback coefficient μ (representing the degree of elastic recovery of the wire after drawing), and the copper wire friction coefficient f (representing the degree of friction between the copper wire and the inner wall of the mold). The material parameters can be obtained by consulting the material testing report provided by the supplier through the purchase channel of the bare copper wire to be drawn, or by experimental determination. For example, the report shows that the material plasticity parameter n=0.3, the copper wire springback coefficient μ=0.05, and the copper wire friction coefficient f=0.12.

[0028] S200, based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire, yields the entry zone parameters of the wire drawing die. These entry zone parameters reflect the entry zone angle and entry zone length.

[0029] The entry zone is the section in the wire drawing die that guides the bare copper wire smoothly into the deformation area inside the die. The entry zone parameters are core parameters describing the geometric characteristics of the deformation area, including the entry zone angle and length. The entry zone angle refers to the angle between the inner wall of the entry zone and the die axis, and the entry zone length refers to the axial length of the entry zone along the die axis. By establishing a correlation between the initial diameter (e.g., 2.0 mm) and the copper wire friction coefficient (e.g., 0.12), suitable entry zone parameters are obtained. For example, combining these two parameters, the entry zone angle α1 = 8° and the entry zone length L1 = 5 mm are calculated, ensuring smooth copper wire entry and reducing frictional resistance during entry.

[0030] As an optional embodiment of this application, in step S200, based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire, the inlet region parameters of the wire drawing die are obtained, including: S210, based on the copper wire friction coefficient of bare copper wire, determines the entrance area angle of the wire drawing die.

[0031] It is understandable that the coefficient of friction of the copper wire directly affects the frictional resistance when the copper wire enters the mold. A higher coefficient of friction, if the entrance angle is too large, can easily lead to scratches on the copper wire surface or lubricant failure. Therefore, it is necessary to match the entrance angle according to the coefficient of friction. The entrance angle can be determined through a preset correlation rule between the coefficient of friction and the entrance angle. This correlation rule includes the entrance angle and the coefficient of friction, and there is a one-to-one correspondence between them. The correlation rule can be obtained by consulting relevant literature. For example, when the coefficient of friction f = 0.12, the corresponding matching entrance angle is 8°. If the coefficient of friction increases to 0.2, the entrance angle needs to be adjusted to 6° to reduce friction.

[0032] In one possible implementation, S210, based on the copper wire friction coefficient of the bare copper wire, determines the entry zone angle of the wire drawing die, including: S211, the copper wire friction coefficient of the bare copper wire is feature extracted to obtain the copper wire friction coefficient level of the bare copper wire.

[0033] It can be understood that the friction coefficient level of copper wire is a classification result after dividing the friction coefficient into intervals, used to simplify the angle matching logic. Feature extraction is to determine the measured friction coefficient according to the preset friction coefficient interval threshold. For example, the preset friction coefficient level division rule is: low friction level (f≤0.1), medium friction level (0.1<f≤0.2), and high friction level (f>0.2). Feature extraction of f=0.12 can be performed to determine that it belongs to the medium friction level.

[0034] S212, based on the copper wire friction coefficient level and the preset entry zone angle range, determines the entry zone angle of the wire drawing die.

[0035] It is understandable that the preset entry zone angle range is a reasonable angle range pre-set based on the frictional resistance characteristics corresponding to different friction coefficient levels, ensuring smooth copper wire introduction. For example, the preset entry zone angle range is 8°-12° for low friction level, 6°-10° for medium friction level, and 4°-8° for high friction level. Combining the medium friction level obtained above, the entry zone angle can be determined to be 8° within the 6°-10° range, and the entry zone angle can balance the introduction efficiency and frictional resistance.

[0036] By adopting the above steps S211 to S212, the matching logic of the entrance area angle is simplified, avoiding the cumbersome calculation problem caused by directly matching the friction coefficient and angle. At the same time, the accuracy of angle matching is improved, and the technical problems of copper wire surface scratches, lubricant failure or low introduction efficiency caused by improper adaptation of entrance area angle under different friction coefficients are solved, ensuring that the copper wire is smoothly introduced into the mold.

[0037] S220, based on the initial diameter of the bare copper wire and the angle of the entry area of ​​the drawing die, the length of the entry area of ​​the drawing die is obtained.

[0038] It is understandable that the length of the entry zone needs to be compatible with the initial diameter and the entry zone angle to ensure that the copper wire can smoothly transition to the subsequent diameter reduction zone and avoid stress concentration during introduction. The entry zone length L1 can be derived by the trigonometric function of the initial diameter and the entry angle: L1=kr×tanα1×D0÷2, where D0 is the initial diameter, α1 is the entry zone angle, and kr is the structural correction coefficient of the mold entry zone. The structural correction coefficient corresponds one-to-one with the entry zone angle. For example, given D0=2.0mm, α1=8°, and kr=5, substituting into the formula, we get the entry zone length L1≈0.7mm. Therefore, the entry zone length is 0.7mm.

[0039] S230, based on the entrance area angle and entrance area length of the wire drawing die, the entrance area parameters are obtained.

[0040] It can be understood that the entrance region parameters are a set of entrance region angles and entrance region lengths, used to fully characterize the geometric features of the entrance region and facilitate subsequent steps. For example, by integrating the obtained entrance region angle of 8° and entrance region length of 0.7mm, the entrance region parameters are obtained as {α1=8°, L1=0.7mm}.

[0041] By adopting the above steps S210 to S230, it is helpful to establish a precise correlation between the initial diameter, friction coefficient and entrance region parameters, solve the technical problems of traditional entrance region parameter design relying on experience and poor adaptability, realize the standardized calculation of entrance region parameters, and make the entrance region angle and length adaptable in a coordinated manner, which reduces the frictional resistance when copper wire is introduced and avoids stress concentration during the introduction process.

[0042] S300 determines the diameter reduction parameters of the wire drawing die based on the entrance region angle, entrance region length, target diameter, and the material plasticity parameters of the bare copper wire.

[0043] It can be understood that the reduction zone is the core deformation area of ​​the wire drawing die, used to achieve the plastic shrinkage deformation of the bare copper wire from the initial diameter to the target diameter. The reduction zone parameters are the core parameters describing the geometric characteristics of the core deformation area, including the reduction zone angle, the effective length of the reduction zone, and the radius of curvature of the reduction zone curve. Combining the entrance zone parameters (e.g., α1=8°, L1=0.7mm), the target diameter (e.g., 1.0mm), and the material plasticity parameters (e.g., n=0.3), a correlation is established through the principle of plastic deformation to ensure that the copper wire deforms uniformly and does not break during the reduction process. For example, the final reduction zone angle α2=12°, the effective length of the reduction zone L2=1.9mm, and the radius of curvature R=1.0mm are determined.

[0044] As an optional embodiment of this application, S300, based on the entrance region angle, entrance region length, target diameter, and the material plasticity parameters of the bare copper wire, determines the diameter reduction region parameters of the wire drawing die, including: S310, determine the diameter reduction zone angle of the wire drawing die based on the inlet zone angle, inlet zone length, and the material plasticity parameters of the bare copper wire.

[0045] It is understandable that the reduction zone angle refers to the angle between the inner wall of the reduction zone and the mold axis. Its size directly affects the deformation rate and stress distribution of the copper wire. It needs to be adapted to the entrance zone angle to avoid stress concentration caused by abrupt angle changes. At the same time, it needs to match the material plasticity parameters (e.g., n=0.3). Copper wires with better plasticity can be adapted to a slightly larger reduction zone angle. For example, combining the entrance zone angle of 8°, the entrance zone length of 0.7mm, and the material plasticity parameter of 0.3, the reduction zone angle α2=12° is determined through deformation stress analysis. The deformation stress analysis is specifically based on the two-stage plastic deformation mechanical characteristics of copper wire drawing, and constructs a logical closed loop by combining the mold geometric connection constraints and the material plasticity parameters: First, through the geometric relationship of the entrance zone... , where D t For transition diameter, The diameter at the entrance of the reduction zone. The length of the entrance area. The inlet angle is represented by α1 = 8°, and the transition diameter D is calculated from the given inlet angle α1 = 8° and inlet length L1 = 0.7 mm. t Meanwhile, to avoid stress concentration caused by abrupt angle changes, the geometric constraint of continuous tangent direction between the reduction zone and the entrance zone must be satisfied (i.e., α2>α1); subsequently, a plastic deformation stress equation is established based on the Hill yield criterion, and the material plasticity parameter n=0.3 is substituted into the equivalent stress formula. Based on the balance between axial stress and contact compressive stress in the diameter reduction zone, a positive correlation between the axial stress change rate and α2 is derived. Simultaneously, based on the value of n, the angle amplification factor k0 = 1.5 is determined (n = 0.3 corresponds to moderate to high plasticity, and k0 ranges from 1.5 to 1.8). Then, the initial candidate value of 12° is calculated using α2 = k0 × α1. Next, through deformation rate constraint verification, α2 = 12° is substituted into the deformation rate formula. ,in, Indicates the deformation rate. Indicates wire drawing speed. Indicates the transition diameter. Indicates the target diameter. This represents the initial candidate value for the reduction zone angle. The drawing speed can be the average speed from historical data. Confirm that the deformation rate is within the maximum allowable deformation rate for copper wire with n=0.3. Within the range, the maximum deformation rate can be obtained by looking up a table to avoid brittle fracture caused by high deformation rate; finally, through finite element simulation verification, the stress distribution under different α2 (10°, 12°, 14°) is compared to verify that the stress gradient is uniform and there is no local stress concentration when α2=12°, and the deformation efficiency and mold wear control are taken into account. Finally, α2=12° is determined to be the optimal solution for the diameter reduction zone angle.

[0046] S320, based on the reduction zone angle and target diameter of the wire drawing die, determines the reduction zone parameters of the wire drawing die.

[0047] It is understandable that the core of the diameter reduction zone parameters is the effective length of the diameter reduction zone (the core working section length of the diameter reduction zone that enables the copper wire to plastically deform from the diameter reduction zone entrance diameter to the target diameter). It needs to be calculated by combining the diameter reduction zone angle (e.g., 12°) and the target diameter (e.g., 1.0 mm) through geometric relationships and the principle of constant deformation volume. Then, the diameter reduction zone angle, radius of curvature and other parameters are integrated to form the complete diameter reduction zone parameters. For example, the final diameter reduction zone parameters are {α2=12°, L2=1.9 mm, R=1.0 mm}.

[0048] By adopting the above steps S310 to S320, it is helpful to achieve precise matching between the parameters of the reduction zone and the parameters of the entrance zone, as well as the plasticity of the copper wire material. This solves the stress concentration caused by the abrupt transition between the angles of the reduction zone and the entrance zone, and the technical problems such as uneven deformation and wire breakage caused by the mismatch between the parameters of the reduction zone and the plasticity of the copper wire. At the same time, it ensures the balance between the deformation efficiency and the wear of the mold during the reduction process, providing core geometric guarantee for the copper wire to stably complete the plastic shrinkage deformation.

[0049] In one possible implementation, S320, based on the reduction zone angle of the wire drawing die and the target diameter, determines the reduction zone parameters of the wire drawing die, including: S321, based on the reduction zone angle, reduction zone inlet diameter, and target diameter of the wire drawing die, the effective length of the reduction zone is obtained. The reduction zone inlet diameter is obtained through geometric conversion from the inlet zone length and inlet zone angle.

[0050] It can be understood that the inlet diameter of the reduction zone is the diameter of the copper wire corresponding to the end of the inlet zone, that is, the initial diameter of the copper wire when it enters the reduction zone. It can be obtained by converting it using the geometric formula D1=D0-2L1×tanα1, where D1 represents the inlet diameter of the reduction zone, D0 represents the initial diameter, L1 represents the length of the inlet zone, and α1 represents the angle of the inlet zone. For example, substituting D0=2.0mm, L1=0.7mm, and α1=8°, we can calculate D1=2.0-2×0.7×tan8°≈1.8mm. The effective length of the reduction zone is the length of the core working section within the reduction zone that enables the copper wire to shrink from D1 (1.8mm) to the target diameter D2 (1.0mm). It can be calculated using the formula L2=(D1-D2)÷(2×tanα2), where D1 represents the entry diameter of the reduction zone, D2 represents the target diameter, L2 represents the length of the reduction zone, and α2 represents the angle of the reduction zone. Substituting α2=12°, D1=1.8mm, and D2=1.0mm, we get L2=(1.8-1.0)÷(2×tan12°)≈1.88mm, which is rounded down to 1.9mm in engineering.

[0051] S322, determine the parameters of the reduction zone based on the effective length and target diameter of the reduction zone of the wire drawing die.

[0052] It is understandable that the parameters of the reduction zone need to fully characterize the geometric features of the reduction zone to support the curved hole design. In addition to the effective length of the reduction zone (1.9mm) and the angle of the reduction zone (12°), the radius of curvature of the reduction zone curve also needs to be determined (to ensure uniform deformation). The radius of curvature of the reduction zone curve can be determined based on the target diameter (1.0mm) and the angle of the reduction zone using the formula R=k×D2÷tanα2 (where k1 is the plastic fit coefficient, R is the radius of curvature of the reduction zone curve, D2 is the target diameter, α2 represents the angle of the reduction zone, k1 is taken as 0.1-0.3, here it is taken as 0.213, and the plastic fit coefficient can be obtained by looking up the fit parameter table of bare copper wire). The calculated value is R=0.213×1.0÷tan12°≈1.0mm. Finally, the integrated parameters of the reduction zone are {α2=12°, L2=1.9mm, R=1.0mm}.

[0053] By adopting the above steps S321 to S322, it is helpful to accurately quantify the effective length of the reduction zone, solve the problem of incomplete deformation caused by insufficient reduction zone length or increased mold wear caused by excessive length. At the same time, by reasonably determining the radius of curvature, it is possible to avoid local stress concentration caused by the overly stiff inner wall of the reduction zone, ensure the uniformity of plastic deformation of copper wire in the reduction zone, and further improve the dimensional accuracy and surface quality of copper wire after reduction.

[0054] S400 determines the exit zone parameters of the wire drawing die based on the diameter reduction zone parameters and the springback coefficient of the copper wire.

[0055] It is understandable that the exit zone is the section that guides the drawn copper wire to smoothly leave the mold. The exit zone parameters are the core parameters describing the geometric characteristics of the exit zone, including the exit zone angle and the exit zone length. Due to the springback effect of the drawn copper wire (copper wire springback coefficient μ=0.05), the exit zone parameters need to be matched with the diameter reduction zone parameters (such as {α2=12°, L2=1.9mm, R=1.0mm}) to avoid springback causing the finished product dimensions to exceed tolerances. For example, the final exit zone angle α3=12.12° and the exit zone length L3=0.96mm were determined.

[0056] As an optional embodiment of this application, S400, based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire, determines the exit zone parameters of the wire drawing die, including: S410, based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire, obtains the initial value of the exit zone angle of the wire drawing die.

[0057] It is understandable that the initial value of the exit zone angle is the angle between the inner wall of the exit zone and the mold axis, which is initially determined based on the reduction zone angle and the copper wire springback coefficient. This angle needs to be matched with the reduction zone angle to ensure a smooth transition and compensate for the springback effect. This can be achieved using formula α3. 0 =α2×(1+0.2μ) is calculated, where α3 0 Let α1 represent the initial angle of the exit zone, α2 represent the angle of the reduction zone, and μ represent the springback coefficient of the copper wire. Substituting α2 = 12° and μ = 0.05, we obtain α3. 0 =12°×(1+0.2×0.05)=12.12°, and 12.12° is used as the initial value of the exit area angle.

[0058] S420, based on the initial value of the exit zone angle, determines the length of the exit zone of the wire drawing die.

[0059] It can be understood that the length of the exit zone is the axial length of the exit zone along the mold axis. Its size needs to be matched with the initial value of the exit zone angle to ensure that the copper wire detaches smoothly and is fully shaped, compensating for springback deformation. This is calculated by dividing the initial value of the exit zone angle into intervals with a matching proportional coefficient, and then combining this with the effective length of the reduction zone. For example, α3 mentioned earlier...0 =12.12° corresponds to a matching export ratio coefficient β=0.5, and the final calculated export zone length is 0.96mm.

[0060] In one possible implementation, S420, based on the initial value of the exit zone angle, determines the exit zone length of the wire drawing die, including: S421, divide the area into intervals according to the initial value of the exit zone angle and match the exit ratio coefficient. The exit ratio coefficient is the ratio of the exit zone length to the effective length of the reduction zone.

[0061] It is understandable that the exit ratio coefficient is the core coefficient relating the exit zone length and the effective length of the reduction zone, ensuring their compatibility. This is achieved through a preset matching rule between the initial exit zone angle value and the exit ratio coefficient. The matching rule includes the initial exit zone angle value and the exit ratio coefficient, which have a one-to-one correspondence. Optionally, the matching rule can be established by consulting relevant literature. The initial exit zone angle value α3 mentioned earlier... 0 =12.12°, corresponding to a matching export ratio coefficient β=0.5.

[0062] S422, based on the exit ratio coefficient and the effective length of the reduction zone, the initial value of the exit zone length is obtained.

[0063] It can be understood that the initial value of the exit zone length is obtained by multiplying the exit ratio coefficient by the effective length of the reduction zone, as shown in the formula L3. 0 =β×L2, substituting β=0.5 and L2=1.9mm, we can calculate L3. 0 =0.5×1.9=0.95mm, that is, the initial value of the length of the exit area is 0.95mm.

[0064] S423, based on the initial value of the exit zone length, the copper wire springback coefficient, and the preset springback correction coefficient, determine the exit zone length of the wire drawing die.

[0065] It is understood that the springback correction factor is used to compensate for the springback effect of copper wire, with a preset value range of 0.1-0.2; here, 0.15 is chosen. This is calculated using the formula L3=L3. 0 The final exit region length is obtained by correcting the result by multiplying by (1+kμ×μ), where L3 represents the exit region length. 0 This represents the initial value of the exit zone length, kμ represents the preset springback correction coefficient, and μ represents the copper wire springback coefficient. Substituting these values ​​into L3... 0 =0.95mm, kμ=0.15, μ=0.05, and the calculated L3=0.95×(1+0.15×0.05)≈0.96mm is used as the final exit zone length in the project.

[0066] By adopting the above steps S421 to S423, it is possible to ensure that the length of the exit zone meets the requirements for smooth copper wire separation, while also providing sufficient shaping time for the copper wire, thus ensuring the dimensional stability of the finished copper wire.

[0067] S430, determine the exit zone parameters of the wire drawing die based on the initial value of the exit zone angle and the exit zone length.

[0068] It can be understood that the exit zone parameters are a set of exit zone angles and exit zone lengths, used to fully characterize the geometric features of the exit zone. For example, by integrating the exit zone angle (12.12°) and exit zone length (0.96mm) obtained above, the exit zone parameters are {α3=12.12°, L3=0.96mm}.

[0069] By adopting the above steps S410 to S430, it is helpful to achieve a smooth transition of the copper wire from the diameter reduction zone to its exit from the mold, thereby further improving the quality stability of the finished copper wire.

[0070] S500, based on the parameters of the inlet area, the reduction area, the target sizing area, and the outlet area, constructs a set of equations for the curved hole profile of the wire drawing die. This set of equations is a multi-segment system. The target sizing area parameters include a preset sizing area length and a preset sizing area diameter tolerance; the sizing area diameter is equal to the target diameter.

[0071] It can be understood that the equation system for the curved hole profile is a mathematical equation describing the geometric shape of the inner wall of the wire drawing die hole. Since the hole is divided into four functional sections: the inlet area, the reduction area, the sizing area, and the outlet area, the equation system is a multi-segment equation system. The sizing area is the core section that ensures the dimensional accuracy of the finished copper wire. The diameter of the sizing area is equal to the target diameter (1.0 mm). The target sizing area parameters include the preset sizing area length (the axial length along the axis, determined by the empirical formula L4=(3-5)×D2, here taken as 4×1.0=4.0 mm) and the preset sizing area diameter tolerance (to control the dimensional accuracy of the finished product, here taken as ±0.001 mm). By integrating the parameters of the inlet region ({α1=8°, L1=0.7mm}), the diameter reduction region ({α2=12°, L2=1.9mm, R=1.0mm}), the target sizing region ({L4=4.0mm, tolerance ±0.001mm}), and the outlet region ({α3=12.12°, L3=0.96mm}), a multi-segment curve profile equation covering the entire hole type is constructed.

[0072] As an optional embodiment of this application, in step S500, a set of equations for the curved hole profile of the wire drawing die is constructed based on the inlet region parameters, the reduction region parameters, the target sizing region parameters, and the outlet region parameters, including: S510, using the center symmetry point of the cross-sectional view of the wire drawing die as the origin, establish the die hole coordinate system.

[0073] It can be understood that the die hole coordinate system is a two-dimensional coordinate system used to quantify the hole profile, which facilitates the derivation of the equations for each functional segment. The origin O is any point on the die axis in the cross-sectional view of the wire drawing die. The die axis is the x-axis (the direction along the copper wire drawing direction is the positive direction), and the direction perpendicular to the die axis is the y-axis (the direction pointing to the inner wall of the hole is the positive direction). For example, the origin O can be any position in the sizing zone. The positive direction of the x-axis points to the exit zone, and the negative direction of the x-axis points to the entrance zone. The x-axis represents the distance from the entrance zone to the exit zone of the wire drawing die, and the y-axis represents the diameter of the wire drawing die.

[0074] S520, based on the parameters of the inlet area, the reduction area, the target sizing area, and the outlet area, as well as the die profile coordinate system, yields multiple functional segment equations. These functional segment equations include the inlet area curve equation, the reduction area curve equation, the sizing area equation, and the outlet area equation.

[0075] It is understandable that the equations for each functional segment are mathematical expressions derived based on the corresponding region parameters and coordinate system, used to accurately describe the geometry of the inner wall of each segment's aperture. For example, the inlet region curve equation, based on an inlet region angle of 8° and a length of 0.7mm, is derived as the arc equation (x+5.0)²+(y-3.7)²=2.8² (x∈[-5.7,-5.0]). The reduction region curve equation, based on a reduction region angle of 12°, an effective length of 1.9mm, and a radius of curvature of 1.0mm, is derived as the parabola equation y=-0.2227x²-2.0144x-3.6045 (x∈[-5.0,-3.1]). The sizing region equation, based on a sizing region diameter of 1.0mm and a length of 4.0mm, is derived as the straight line equation y=0.5 (x∈[-3.1,0.9]). The exit zone equation is derived from the exit zone angle of 12.12° and length of 0.96mm, and is a straight line equation y=0.213x+0.3083 (x∈[0.9,1.86]). The range of x values ​​for each equation corresponds to the distribution interval of each functional segment along the x-axis.

[0076] S530, based on the inlet area curve equation, the reduction area curve equation, the sizing area equation, and the outlet area equation, constructs a set of curve hole profile equations for wire drawing dies.

[0077] It is understandable that the curved hole profile equation set is a multi-segment equation set formed by integrating the equations of each functional segment in the axial order of the hole shape. It is necessary to ensure the geometric continuity of adjacent functional segments at the connection points. For example, the equations of the inlet area, the reduction area, the sizing area, and the outlet area are integrated in the order from the negative x-axis to the positive x-axis, clarifying the applicable range of each equation, and finally forming a complete multi-segment profile equation for subsequent mold hole design.

[0078] By adopting the above steps S510 to S530, it is helpful to realize the digital and precise characterization of the hole profile, provide a unified and reliable mathematical basis for the processing and manufacturing of mold hole profiles, and ensure processing accuracy.

[0079] In one possible implementation, S530, based on the inlet region curve equation, the reduction region curve equation, the sizing region equation, and the outlet region equation, a set of curved hole profile equations for the wire drawing die is constructed, including: S531, based on the inlet region curve equation, the reduction region curve equation, the sizing region equation, and the outlet region equation, determines the continuity value of the connection between the equations of each functional segment. The continuity value is a characteristic parameter used to quantify the geometric continuity between the equations of two adjacent functional segments at the connection point.

[0080] It can be understood that the continuity value is a parameter characterizing the geometric smoothness at the connection point between adjacent functional segments. Its core components include the first-order continuity value (the derivatives of adjacent equations at the connection point are equal, i.e., the tangent directions are consistent) and the second-order continuity value (the second derivatives of adjacent equations at the connection point are equal, i.e., the curvature is consistent). For example, if the coordinates of the connection point between the entrance region and the reduction region are (-5.0, 0.9), the first derivative of the entrance region curve equation at the connection point between the entrance region and the reduction region is 0.139, and the first derivative of the reduction region equation at the connection point between the entrance region and the reduction region is also 0.139. Therefore, the first-order continuity value is 1 (indicating that first-order continuity is satisfied), and the second-order continuity value is 0.8 (indicating that it is close to second-order continuity).

[0081] S532, based on the continuous values ​​of the inlet curve equation, the reduction curve equation, the sizing equation, the outlet equation, and the equations of each functional segment, obtains multiple functional segment correction equations.

[0082] It is understandable that if the continuity value of the connection does not meet the preset requirements (e.g., the first-order continuity value needs to be ≥1, and the second-order continuity value needs to be ≥0.8), then the equations of the corresponding functional segments are modified to ensure smooth connection. For example, if the first-order continuity value of the diameter reduction zone and the diameter fixing zone is 0.9 (not meeting the requirements), then the coefficients of the parabola equation of the diameter reduction zone are adjusted, and a new curve equation for the diameter reduction zone is obtained after modification, so that the first-order continuity value at the connection point reaches 1.0, and finally the modified equations of each functional segment are obtained.

[0083] S533, based on the modified equations of multiple functional segments, constructs a set of equations for the curved hole profile of the wire drawing die.

[0084] It is understandable that by integrating the corrected equations for the inlet, reduction, sizing, and outlet regions in axial order, and clarifying the applicable x-axis intervals for each equation, a complete set of multi-segment curved hole profile equations is formed. For example, the integrated profile equations are: when x∈[-5.7,-5.0], y satisfies the corrected circular arc equation for the inlet region. When x∈[-5.0,-3.1], y satisfies the corrected parabolic equation for the reduction region. When x∈[-3.1,0.9], y=0.5. When x∈[0.9,1.86], y satisfies the corrected straight line equation for the outlet region. This multi-segment curved hole profile equation set can be directly used for the machining design of mold holes.

[0085] By adopting the above steps S531 to S533, it is helpful to improve the accuracy of the contour equation through equation correction, ensure a smooth transition of the inner wall of the mold hole, and further improve the wire drawing quality and the service life of the mold.

[0086] S600, based on the curve hole profile equation set, designs the curve hole of the drawing die for bare copper wire.

[0087] It is understandable that designing the curved holes in a bare copper wire drawing die based on the curved hole profile equations involves transforming the constructed multi-segment curved hole profile equations into an actual die processing scheme. This is achieved by importing the equations into CAD or other drawing software to generate two-dimensional cross-sectional and top-view diagrams of the die hole, clarifying the overall dimensions of the die and the required machining accuracy of the hole's inner wall. Please refer to [link / reference]. Figure 4 and Figure 5 For example, based on the equation set of curved hole contours, a two-dimensional cross-sectional view and a two-dimensional top view of the wire drawing die are generated, providing a precise basis for the subsequent processing and manufacturing of the die, and finally completing the design of the curved hole of the wire drawing die adapted to bare copper wire (initial diameter 2.0mm, target diameter 1.0mm).

[0088] By adopting the above steps S100 to S600, it is helpful to achieve precise matching between the die hole shape and the characteristics of the bare copper wire, significantly improve the dimensional accuracy, surface quality and production stability of the drawn wire products, while reducing the wire breakage rate and the error rate of die processing and manufacturing, thereby improving production efficiency and economic benefits.

[0089] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0090] Corresponding to the bare copper wire drawing die curved hole design method described in the above embodiments, this application embodiment also provides a bare copper wire drawing die curved hole design system, the various units of which can realize the various steps of the bare copper wire drawing die curved hole design method. Figure 5The diagram shows a structural block diagram of the curved hole design system for bare copper wire drawing die provided in an embodiment of this application. For ease of explanation, only the parts related to the embodiment of this application are shown.

[0091] Reference Figure 5 The system includes: The acquisition unit is used to acquire the initial diameter, target diameter, and material parameters of the bare copper wire. The material parameters include the plasticity parameter, springback coefficient, and friction coefficient of the bare copper wire.

[0092] The entry unit is used to obtain the entry zone parameters of the wire drawing die based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire. The entry zone parameters reflect the entry zone angle and the entry zone length.

[0093] The diameter reduction unit is used to determine the diameter reduction parameters of the wire drawing die based on the inlet region parameters, the target diameter, and the material plasticity parameters of the bare copper wire.

[0094] The exit unit is used to determine the exit zone parameters of the wire drawing die based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire.

[0095] The equation unit is used to construct a set of equations for the curved hole profile of the wire drawing die based on the parameters of the inlet region, the reduction region, the target sizing region, and the outlet region. The curved hole profile equation set is a multi-segment equation set. The target sizing region parameters include a preset sizing region length and a preset sizing region diameter tolerance, where the sizing region diameter is equal to the target diameter.

[0096] The design unit is used to design the curved holes of the drawing die for bare copper wire based on the curved hole profile equation set.

[0097] It should be noted that the information interaction and execution process between the above-mentioned units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, which will not be repeated here.

[0098] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units is merely an example. In practical applications, the above functions can be assigned to different functional units as needed, that is, the internal structure of the system can be divided into different functional units to complete all or part of the functions described above. The functional units in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0099] This application also provides an electronic device. Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 6 As shown, the electronic device 6 of this embodiment includes: at least one processor 60 ( Figure 4 Only one is shown in the image), at least one memory 61 ( Figure 4 (Only one is shown in the image) and a computer program 62 stored in the at least one memory 61 and executable on the at least one processor 60, wherein when the processor 60 executes the computer program 62, it causes the electronic device 6 to perform the steps in any of the above embodiments of the bare copper wire drawing die curved hole design method, or causes the electronic device 6 to perform the functions of the units in the above embodiments of the system.

[0100] For example, the computer program 62 may be divided into one or more units, which are stored in the memory 61 and executed by the processor 60 to complete this application. The one or more units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 62 in the electronic device 6.

[0101] The electronic device 6 may be an industrial control computer, an edge computing gateway, a production scheduling server, a cloud server, an industrial tablet computer, or an intelligent scheduling terminal, etc. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method described in any of the foregoing aspects. The electronic device 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will understand that... Figure 6This is merely an example of electronic device 6 and does not constitute a limitation on electronic device 6. It may include more or fewer components than shown, or combine certain components, or different components, such as input / output devices, network access devices, buses, etc.

[0102] The processor 60 can be a Central Processing Unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0103] In some embodiments, the memory 61 may be an internal storage unit of the electronic device 6, such as a hard disk or memory of the electronic device 6. In other embodiments, the memory 61 may be an external storage device of the electronic device 6, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the electronic device 6. Furthermore, the memory 61 may include both internal and external storage units of the electronic device 6. The memory 61 is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory 61 can also be used to temporarily store data that has been output or will be output.

[0104] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.

[0105] This application provides a computer program product that, when run on an electronic device, causes the electronic device to perform the steps in any of the above method embodiments.

[0106] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or system capable of carrying computer program code to an electronic device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks.

[0107] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0108] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0109] In the embodiments provided in this application, it should be understood that the disclosed method, system, and electronic device for designing curved holes in bare copper wire drawing dies can be implemented in other ways. For example, the embodiments of the bare copper wire drawing die curved hole design system and electronic device described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units may be electrical, mechanical, or other forms.

[0110] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0111] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for designing curved holes in bare copper wire drawing dies, characterized in that, include: Obtain the initial diameter, target diameter, and material parameters of the bare copper wire; wherein, the material parameters include the material plasticity parameter, springback coefficient, and friction coefficient of the bare copper wire; Based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire, the inlet region parameters of the wire drawing die are obtained; wherein, the inlet region parameters are used to reflect the inlet region angle and the inlet region length; Based on the entrance region angle, the entrance region length, the target diameter, and the material plasticity parameters of the bare copper wire, the diameter reduction region parameters of the wire drawing die are determined; Based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire, the exit zone parameters of the wire drawing die are determined. Based on the inlet area parameters, the reduction area parameters, the target sizing area parameters, and the outlet area parameters, a set of equations for the curved hole profile of the wire drawing die is constructed; wherein, the set of equations for the curved hole profile is a multi-segment set of equations; the target sizing area parameters include a preset sizing area length and a preset sizing area diameter tolerance, and the sizing area diameter is equal to the target diameter; Based on the aforementioned set of curved hole contour equations, the curved hole of the wire drawing die for the bare copper wire is designed.

2. The method for designing curved holes in bare copper wire drawing dies according to claim 1, characterized in that, The process of obtaining the entry zone parameters of the wire drawing die based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire includes: Based on the coefficient of friction of the bare copper wire, the entry angle of the wire drawing die is determined; The length of the inlet area of ​​the wire drawing die is obtained based on the initial diameter of the bare copper wire and the inlet area angle of the wire drawing die. Based on the inlet angle and inlet length of the drawing die, the inlet parameters are obtained.

3. The method for designing curved holes in bare copper wire drawing dies according to claim 2, characterized in that, The determination of the entry angle of the wire drawing die based on the friction coefficient of the bare copper wire includes: The friction coefficient of the bare copper wire is extracted to obtain the friction coefficient level of the bare copper wire. The entry angle of the wire drawing die is determined based on the friction coefficient level of the copper wire and the preset entry angle range.

4. The method for designing curved holes in bare copper wire drawing dies according to claim 1, characterized in that, The determination of the diameter reduction zone parameters of the wire drawing die based on the entrance zone angle, the entrance zone length, the target diameter, and the material plasticity parameters of the bare copper wire includes: The reduction zone angle of the wire drawing die is determined based on the entrance zone angle, the entrance zone length, and the material plasticity parameters of the bare copper wire. Based on the reduction zone angle of the wire drawing die and the target diameter, the reduction zone parameters of the wire drawing die are determined.

5. The method for designing curved holes in bare copper wire drawing dies according to claim 4, characterized in that, The determination of the reduction zone parameters of the wire drawing die based on the reduction zone angle of the wire drawing die and the target diameter includes: The effective length of the reduction zone of the wire drawing die is obtained based on the reduction zone angle, the reduction zone inlet diameter, and the target diameter; wherein, the reduction zone inlet diameter is obtained by geometric conversion from the inlet zone length and the inlet zone angle. The parameters of the reduction zone are determined based on the effective length of the reduction zone of the wire drawing die and the target diameter.

6. The method for designing curved holes in bare copper wire drawing dies according to claim 1, characterized in that, The determination of the exit zone parameters of the wire drawing die based on the diameter reduction zone parameters of the wire drawing die and the copper wire springback coefficient includes: Based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire, the initial value of the exit zone angle of the wire drawing die is obtained; Based on the initial value of the exit zone angle, the length of the exit zone of the wire drawing die is determined; The exit zone parameters of the wire drawing die are determined based on the initial value of the exit zone angle and the exit zone length.

7. The method for designing curved holes in bare copper wire drawing dies according to claim 6, characterized in that, Determining the length of the exit zone of the wire drawing die based on the initial value of the exit zone angle includes: The exit area is divided into intervals according to the initial value of the exit area angle and the exit ratio coefficient is matched; wherein, the exit ratio coefficient is the ratio of the exit area length to the effective length of the diameter reduction area; Based on the exit ratio coefficient and the effective length of the reduction zone, the initial value of the exit zone length is obtained; The length of the exit zone of the wire drawing die is determined based on the initial value of the exit zone length, the copper wire springback coefficient, and the preset springback correction coefficient.

8. The method for designing curved holes in bare copper wire drawing dies according to claim 1, characterized in that, The step of constructing the curved hole profile equation set of the wire drawing die based on the inlet region parameters, the reduction region parameters, the target sizing region parameters, and the outlet region parameters includes: A die hole coordinate system is established with the center symmetry point of the cross-sectional view of the wire drawing die as the origin; Based on the inlet region parameters, the reduction region parameters, the target sizing region parameters, the outlet region parameters, and the mold die shape coordinate system, multiple functional segment equations are obtained; wherein, the functional segment equations include the inlet region curve equation, the reduction region curve equation, the sizing region equation, and the outlet region equation; Based on the inlet region curve equation, the reduction region curve equation, the sizing region equation, and the outlet region equation, a set of curve-shaped hole contour equations for the wire drawing die is constructed.

9. The method for designing curved holes in bare copper wire drawing dies according to claim 8, characterized in that, The process of constructing a set of curved hole contour equations for the wire drawing die based on the inlet region curve equation, the reduction region curve equation, the sizing region equation, and the outlet region equation includes: Based on the inlet region curve equation, the reduction region curve equation, the sizing region equation, and the outlet region equation, the connection continuity value of each functional segment equation is determined; wherein, the connection continuity value is a characteristic parameter used to quantify the geometric continuity of two adjacent functional segment equations at the connection point. Based on the connection continuity values ​​of the inlet region curve equation, the reduction region curve equation, the sizing region equation, the outlet region equation, and the equations of each functional segment, multiple functional segment correction equations are obtained. Based on the multiple functional segment correction equations, a set of equations for the curved hole profile of the wire drawing die is constructed.

10. A curved hole design system for bare copper wire drawing dies, characterized in that, include: The acquisition unit is used to acquire the initial diameter, target diameter, and material parameters of the bare copper wire; wherein, the material parameters include the material plasticity parameter, springback coefficient, and friction coefficient of the bare copper wire. An inlet unit is used to obtain inlet zone parameters of the wire drawing die based on the initial diameter of the bare copper wire and the coefficient of friction of the copper wire; the inlet zone parameters reflect the inlet zone angle and the inlet zone length; A diameter reduction unit is used to determine the diameter reduction parameters of the wire drawing die based on the inlet region parameters, the target diameter, and the material plasticity parameters of the bare copper wire. An exit unit is used to determine the exit zone parameters of the wire drawing die based on the diameter reduction zone parameters of the wire drawing die and the springback coefficient of the copper wire. An equation unit is used to construct a set of equations for the curved hole profile of the wire drawing die based on the inlet region parameters, the reduction region parameters, the target sizing region parameters, and the outlet region parameters; wherein the set of equations for the curved hole profile is a multi-segment set of equations; the target sizing region parameters include a preset sizing region length and a preset sizing region diameter tolerance, wherein the sizing region diameter is equal to the target diameter; The design unit is used to design the curved hole of the drawing die for the bare copper wire based on the curved hole profile equation set.

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