R-angle optimized heteromorphic filament drawing die
By optimizing the radius angle design and cooling device, the problems of stress concentration and high temperature in the irregular single wire drawing die were solved, achieving high-quality forming and stable production of copper wire.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TONGLING CHANG JIANG COPPER IND
- Filing Date
- 2025-05-26
- Publication Date
- 2026-06-09
AI Technical Summary
The unreasonable R-angle design of traditional irregular single wire drawing dies leads to stress concentration, resulting in surface cracks and high temperatures, which affects the conductivity and toughness of copper wire.
A non-circular single-wire drawing die with optimized radius (R) is designed. Through multi-stage gradual radius (R) and cooling device, compressive stress is released in layers and temperature is controlled and cooled quickly to ensure the forming quality and surface finish of the copper wire.
It effectively inhibits surface cracks and high-temperature structural performance degradation, improves the forming quality and process stability of copper wire, and ensures dimensional accuracy and surface finish.
Smart Images
Figure CN224333113U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tamping hammer technology, and in particular to a non-circular single-wire drawing die with optimized radius (R-angle) and its processing method. Background Technology
[0002] The continuous drawing process of copper wire mainly includes three parts: drawing, online annealing after drawing, and stranding. Drawing copper wire involves using drawing dies to induce plastic deformation. Drawing dies are a crucial and easily consumable tool in the production of various metal wires, and their cost accounts for a significant proportion of the total drawing cost. Therefore, for wire manufacturers, reducing costs while achieving stable and long-term drawing, precise dimensions, and good surface quality is of paramount importance.
[0003] Most irregularly shaped monofilament drawing dies suffer from the following problems: Sharp corners in traditional dies (such as the 90° angle when drawing a round copper wire to a rectangle) easily lead to stress concentration, causing surface cracks in the copper wire or die chipping. Furthermore, an improperly designed radius (R-angle) increases contact resistance, affecting cable conductivity. Additionally, the copper wire generated after drawing from the die reaches high temperatures; without rapid cooling, wire breakage or insufficient toughness in the newly drawn wire can easily occur. Therefore, we propose an irregularly shaped monofilament drawing die with optimized radius and its processing method. Utility Model Content
[0004] The purpose of this invention is to solve the problems of unreasonable radius angle and inadequate cooling, and to provide an irregularly shaped monofilament drawing die with optimized radius angle and its processing method.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A non-circular single-wire drawing die with optimized radius (R-angle) includes a drawing powder box. The die is characterized by: a copper single wire being slidably mounted through the outer wall of the drawing powder box; an optimized die being fixedly mounted at the left end of the drawing powder box; a cooling device being provided at the top of the drawing powder box; and the inner wall of the optimized die having an entry section, a buffer section, an R-angle optimization section, an R-angle reduction section, a diameter reduction section, a springback section, and an exit section. The entry section is located on the inner wall of the optimized die near the drawing powder box; the buffer section is located on the inner wall of the optimized die near the entry section; the R-angle optimization section is located on the inner wall of the optimized die near the buffer section; the R-angle reduction section is located on the inner wall of the optimized die at the middle of the inner wall; the diameter reduction section is located on the inner wall of the optimized die near the R-angle reduction section; the springback section is located on the inner wall of the optimized die near the diameter reduction section; and the exit section is located on the inner wall of the optimized die away from the drawing powder box.
[0007] Preferably, the entry angle of the mold section is relatively large, the buffer section is a downward-sloping trapezoidal shape, the entry angle of the angle optimization section is a gentle arc surface, the angle of the angle optimization section entering the angle reduction section is a sharp downward arc, the reduction section is a quadrilateral shape, the four corners of the angle reduction section entering the reduction section are gentle angles, and the middle of the reduction section is a downward-sloping surface, the angle of the reduction section entering the springback section is slightly upward-sloping, and the exit section is an open angle.
[0008] Preferably, the cooling device includes a water tank, a water pipe, a water pump, a guide tube, a limiting block, a rotating shaft, a connecting plate, and a dispersing plate. The water tank is fixedly installed on the top of the drawing powder box. One end of the water pipe is fixedly installed on the outer wall of the water tank. The input end of the water pump is fixedly installed on the other end of the water pipe. The guide tube is fixedly installed on the output end of the water pump. The limiting block is fixedly installed on the outer wall of the guide tube at the end away from the water pump. The rotating shaft is fixedly installed on the inner wall of the limiting block. The connecting plate is rotatably installed on the outer wall of the rotating shaft. The dispersing plate is fixedly installed on the end of the connecting plate away from the rotating shaft.
[0009] Preferably, the outlet of the conduit is located at the outlet of the mold ejection section of the optimized mold, a torsion spring is provided between the connecting plate and the rotating shaft, the dispersion plate is inclined and located at the outlet of the conduit.
[0010] A method for processing an irregularly shaped monofilament drawing die with optimized radius (R-angle) includes the following steps:
[0011] S1. When copper wire is cold drawn, the beginning of the copper wire will first enter the mold entry section of the optimized mold. Through the large opening and R-angle design of the mold entry section, the compressed part of the copper wire is pre-guided by the R-angle when it is pre-reduced in diameter.
[0012] S2. Turn on the water pump. The water pump draws cooling water into the water tank through the water pipe. The drawn cooling water is then pumped out through the outlet at the other end of the pipe.
[0013] By employing the above technical solution, this utility model provides an optimized R-angle irregular monofilament drawing die and its processing method. It possesses at least the following beneficial effects:
[0014] (1) By setting the R-angle optimization section, the copper monofilament is released in layers during the cold drawing process through the setting of multi-level gradual R-angle, which completely suppresses the generation of surface cracks. At the same time, the springback compensation mechanism ensures the product size accuracy and surface smoothness, significantly improving the forming quality and process stability of the shaped copper wire.
[0015] (2) By setting the dispersion plate, the water jet will be sprayed in a fan shape onto the surface of the copper single wire, thereby achieving the effect of quickly controlling the temperature and reducing the wire temperature. This effectively inhibits the degradation of the structure properties caused by high temperature, and at the same time eliminates the accumulation of thermal stress, avoiding dimensional deviations or surface microcracks caused by uneven thermal expansion. Attached Figure Description
[0016] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:
[0017] Figure 1 This is a front view schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a cross-sectional schematic diagram of the optimized mold in this embodiment;
[0019] Figure 3 This is a cross-sectional schematic diagram of the cooling device in Embodiment 2;
[0020] Figure 4 This is an enlarged schematic diagram of the second embodiment.
[0021] In the diagram: 1. Wire drawing powder box; 11. Copper monofilament; 21. Optimized mold; 22. Mold entry section; 23. Buffer section; 24. R-angle optimization section; 25. R-angle diameter reduction section; 26. Diameter reduction section; 27. Springback section; 28. Mold exit section; 3. Cooling device; 31. Water tank; 32. Water pipe; 33. Water pump; 34. Conduit; 35. Limiting block; 36. Rotating shaft; 37. Connecting plate; 38. Dispersion plate. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Example 1
[0024] An R-angle optimized irregular monofilament drawing die and its processing method, such as Figures 1-2As shown, the device includes a wire drawing powder box 1. A copper monofilament 11 is slidably mounted through the outer wall of the wire drawing powder box 1. An optimization mold 21 is fixedly mounted on the left end of the wire drawing powder box 1. A cooling device 3 is provided on the top of the wire drawing powder box 1. The inner wall of the optimization mold 21 has an entry section 22, a buffer section 23, a radius optimization section 24, a radius reduction section 25, a diameter reduction section 26, a springback section 27, and an exit section 28. The entry section 22 is located on the inner wall of the optimization mold 21 near the wire drawing powder box 1. The buffer section 23 is located on the inner wall of the optimized mold 21 near the entry section 22. The R-angle optimization section 24 is located on the inner wall of the optimized mold 21 near the buffer section 23. The R-angle reduction section 25 is located on the middle inner wall of the optimized mold 21. The reduction section 26 is located on the inner wall of the optimized mold 21 near the R-angle reduction section 25. The springback section 27 is located on the inner wall of the optimized mold 21 near the reduction section 26. The exit section 28 is located on the inner wall of the optimized mold 21 away from the drawing powder box 1.
[0025] The entry point of the mold section 22 has a large radius (R-angle). The buffer section 23 is a downward-sloping trapezoidal shape. The entry point of the radius optimization section 24 has a gentle arc surface. The radius of the radius optimization section 24 entering the radius reduction section 25 is a sharp downward arc. The diameter reduction section 26 is a quadrilateral shape. The four corners of the radius reduction section 25 entering the diameter reduction section 26 have gentle radius angles. The middle of the diameter reduction section 26 has a downward-sloping surface. The radius of the diameter reduction section 26 entering the springback section 27 is slightly upward-sloping. The exit section 28 has an open radius angle.
[0026] This utility model discloses an optimized R-angle drawing die for irregularly shaped monofilaments and its processing method. When producing irregularly shaped copper monofilaments 11 using the drawing process, the copper monofilament 11 is drawn to the other side of the optimized die 21 via the traction end and pulled out. During cold drawing, the beginning of the copper wire first enters the die entry section 22 of the optimized die 21. Through the larger opening and R-angle design of the die entry section 22, the compressed portion of the copper wire is pre-guided by the R-angle during pre-diameter reduction. When the copper wire enters through an opening slightly smaller than the die entry section 22... In buffer section 23, the copper wire releases the contraction stress generated by the diameter reduction in layers through a trapezoidal decreasing manner. When the copper wire enters the R-angle optimization section 24, the R-angle of the entry section is a gentle arc surface, dispersing most of the compressive stress. The compressive stress of the copper wire entering the R-angle optimization section 24 has been gradually reduced. However, when the R-angle optimization section 24 enters the R-angle diameter reduction section 25, the diameter of the exit of the R-angle optimization section 24 and the entrance of the R-angle diameter reduction section 25 drops sharply. Due to the gradual reduction of the compressive stress before, the compressive stress generated at this time is relatively small, even with the sharp drop. This design also prevents surface cracks from forming on the copper wire. When the R-angle reduction section 25 enters the reduction section 26, the gentle R-angle setting, combined with its rounded transition structure, effectively suppresses surface crack formation again, ensuring the accuracy of the shape transition and the surface finish. The downward-decreasing slope design of the reduction section 26 is the drawing diameter of the pre-shrunken copper wire 11. At the exit and the springback section 27, the R-angle is slightly inclined upward, allowing the pre-shrunken copper wire 11 to spring back to the required size. After entering the die exit section 28 from the springback section 27... The open radius (R-angle) of the exit section 28 eliminates springback stress. The combination of the R-angle pre-guidance of the entry section 22 and the trapezoidal stress layering release of the buffer section 23 effectively reduces the initial peak compressive stress. The arc surface of the R-angle optimization section 24, combined with the stress reduction mechanism of the sharp-turn R-angle reduction section 25, precisely controls the compression deformation gradient. The inclined surface of the reduction section 26 and the tilted R-angle of the springback section 27 work together to ensure elastic springback compensation and achieve the required dimensional springback adjustment. The springback section 27, in conjunction with the open radius (R-angle) of the exit section 28, finally eliminates residual stress. By setting a multi-level gradually changing radius (R-angle), the compressive stress of the copper monofilament 11 is released layer by layer during cold drawing, completely suppressing the generation of surface cracks. At the same time, the springback compensation mechanism ensures the dimensional accuracy and surface finish of the product, significantly improving the forming quality and process stability of the shaped copper wire.
[0027] Example 2
[0028] This embodiment, based on embodiment 1, specifically includes the following:
[0029] like Figures 3-4As shown, the cooling device 3 includes a water tank 31, a water pipe 32, a water pump 33, a conduit 34, a limiting block 35, a rotating shaft 36, a connecting plate 37, and a dispersing plate 38. The water tank 31 is fixedly installed on the top of the drawing powder box 1. One end of the water pipe 32 is fixedly installed on the outer wall of the water tank 31. The input end of the water pump 33 is fixedly installed on the other end of the water pipe 32. The conduit 34 is fixedly installed on the output end of the water pump 33. The limiting block 35 is fixedly installed on the outer wall of the conduit 34 away from the water pump 33. The rotating shaft 36 is fixedly installed on the inner wall of the limiting block 35. The connecting plate 37 is rotatably installed on the outer wall of the rotating shaft 36. The dispersing plate 38 is fixedly installed on the end of the connecting plate 37 away from the rotating shaft 36.
[0030] The outlet of the conduit 34 is located at the outlet of the mold section 26 of the optimized mold 21. A torsion spring is provided between the connecting plate 37 and the rotating shaft 36. The dispersion plate 38 is inclined and located at the outlet of the conduit 34.
[0031] A method for processing an irregularly shaped monofilament drawing die with optimized radius (R-angle) includes the following steps:
[0032] S1. When the copper wire is cold drawn, the beginning of the copper wire will first enter the mold section 22 of the optimized mold 21. Through the larger opening and R-angle design of the mold section 22, the compressed part of the copper wire is pre-guided by the R-angle when it is pre-reduced in diameter.
[0033] S2, the dispersing plate 38 drives the connecting plate 37 to pry upward, and the connecting plate 37 is reset by the torsion spring on the outer wall of the rotating shaft 36, while the sprayed water will be sprayed in a fan shape onto the surface of the copper monofilament 11 due to the dispersing plate 38.
[0034] In the application of this utility model, an R-angle optimized irregular monofilament drawing die and its processing method, the high temperature on the surface of the copper wire after drawing is caused by the combined effect of intense plastic deformation and frictional heat. Under high-speed drawing, the heat cannot dissipate in time, and the superposition of multiple heat sources causes the surface temperature to rise sharply, directly affecting the microstructure of the material and the processing stability. At this time, the water pump 33 is turned on, and the water pump 33 draws cooling water into the water tank 31 through the water pipe 32. The drawn cooling water is then drawn out through the outlet at the other end of the conduit 34. The drawn water will first contact the inclined dispersion plate 38, causing the dispersion plate 38 to drive the connecting plate 37 to pry upward. The connecting plate 37 is reset by the torsion spring on the outer wall of the rotating shaft 36. The sprayed water will be sprayed in a fan shape onto the surface of the copper monofilament 11 due to the dispersion plate 38, thereby achieving the effect of rapid temperature control and reducing the temperature of the wire. This effectively inhibits the degradation of the microstructure caused by high temperature, eliminates the accumulation of thermal stress, and avoids dimensional deviations or surface microcracks caused by uneven thermal expansion.
[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A non-circular monofilament drawing die with optimized radius (R), comprising a drawing powder box (1), characterized in that: A copper monofilament (11) is slidably mounted through the outer wall of the drawing powder box (1). An optimization mold (21) is fixedly mounted on the left end of the drawing powder box (1). A cooling device (3) is provided on the top of the drawing powder box (1). The inner wall of the optimization mold (21) is provided with an entry section (22), a buffer section (23), an R-angle optimization section (24), an R-angle diameter reduction section (25), a diameter reduction section (26), a springback section (27), and an exit section (28). The entry section (22) is located on the inner wall of the optimization mold (21) near the drawing powder box (1). The buffer section... (23) is opened on the inner wall of the optimized mold (21) near the mold entry section (22), the R-angle optimization section (24) is opened on the inner wall of the optimized mold (21) near the buffer section (23), the R-angle reduction section (25) is opened on the middle inner wall of the optimized mold (21), the reduction section (26) is opened on the inner wall of the optimized mold (21) near the R-angle reduction section (25), the springback section (27) is opened on the inner wall of the optimized mold (21) near the reduction section (26), and the exit section (28) is opened on the inner wall of the optimized mold (21) away from the drawing powder box (1).
2. The irregular monofilament drawing die with optimized radius (R-angle) according to claim 1, characterized in that: The entry section (22) has a large radius (R) at its entrance. The buffer section (23) is a downward-sloping trapezoidal shape. The entry radius (R) of the radius optimization section (24) is a gentle arc surface. The radius (R) of the radius optimization section (24) entering the radius reduction section (25) is a sharp downward arc. The radius reduction section (26) is a quadrilateral shape. The four corners of the radius reduction section (25) entering the radius reduction section (26) are gentle radius angles. The middle of the radius reduction section (26) is a downward-sloping surface. The radius (R) of the radius reduction section (26) entering the springback section (27) is slightly upward-sloping. The exit section (28) has an open radius (R).
3. The irregular monofilament drawing die with optimized radius (R-angle) according to claim 2, characterized in that: The cooling device (3) includes a water tank (31), a water pipe (32), a water pump (33), a conduit (34), a limiting block (35), a rotating shaft (36), a connecting plate (37), and a dispersing plate (38). The water tank (31) is fixedly installed on the top of the drawing powder box (1). One end of the water pipe (32) is fixedly installed on the outer wall of the water tank (31). The input end of the water pump (33) is fixedly installed on the other end of the water pipe (32). The conduit (34) is fixedly installed on the output end of the water pump (33). The limiting block (35) is fixedly installed on the outer wall of the conduit (34) away from the water pump (33). The rotating shaft (36) is fixedly installed on the inner wall of the limiting block (35). The connecting plate (37) is rotatably installed on the outer wall of the rotating shaft (36). The dispersing plate (38) is fixedly installed on the end of the connecting plate (37) away from the rotating shaft (36).
4. The irregular monofilament drawing die with optimized radius (R-angle) according to claim 3, characterized in that: The outlet of the conduit (34) is located at the outlet of the mold section (28) of the optimized mold (21). A torsion spring is provided between the connecting plate (37) and the rotating shaft (36). The dispersing plate (38) is inclined and located at the outlet of the conduit (34).