Special diamond drawing die for multi-end drawing
By using a three-section compression die and polycrystalline diamond core design for multi-head diamond wire drawing dies, the problems of wear and insufficient die design in traditional wire drawing dies during high-speed drawing are solved, achieving high-precision and high-efficiency wire production.
Patent Information
- Application Number
- CN202522140289.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-10
AI Technical Summary
Traditional wire drawing dies are prone to wear and deformation in high-speed drawing or high surface area reduction processing scenarios. The lack of targeted hole design leads to problems such as uneven stress on the wire, wire breakage and surface scratches, making it difficult to meet the production needs of high-precision wires.
It adopts a multi-head diamond wire drawing die, combined with a three-section compression die, polycrystalline diamond die core and high-efficiency lubrication and heat dissipation design, including stainless steel die sleeve, diamond die core, sintered body and die cover. It is designed with a reasonable compression angle and sizing zone length, and is equipped with an elastic buffer layer to absorb vibration and ensure stable wire quality.
It has achieved stability in wire quality and extended mold life, improved wire surface finish and dimensional accuracy, achieved a finished product qualification rate of over 98%, and increased mold life by 30%.
Smart Images
Figure CN224673491U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a wire drawing die, specifically a diamond wire drawing die for multi-head drawing. Background Technology
[0002] In the field of metal wire drawing, dies are core components, and their performance directly affects the dimensional accuracy, surface quality, and production efficiency of the wire. Traditional wire drawing dies often face two key problems: First, the overall structural design and material matching of the die are insufficient. Some dies use a single material or a combination of a common metal outer casing and a low-hardness die core, leading to easy wear of the die core and deformation of the outer casing. It is difficult to balance the structural stability and long-term accuracy of the die, especially in high-speed drawing or high reduction ratio processing scenarios, where the problem of short die life and frequent replacement is prominent. Second, the die hole design lacks targeted optimization. The angle of the compression zone is mostly a fixed value, which cannot be adapted to the stress changes and reduction ratio requirements during the wire drawing process. This easily leads to uneven stress on the wire in the deformation zone and insufficient lubrication film, resulting in defects such as wire breakage and surface scratches. At the same time, unreasonable design of the sizing zone length also affects the dimensional consistency and surface finish of the wire. In addition, the rough control of the processing technology further exacerbates the problems of insufficient die accuracy and poor surface quality, restricting the stable production of high-precision wire. Therefore, developing a wire drawing die that combines a high-strength outer jacket, a high-wear-resistant core, and a scientifically designed die hole has become a key requirement for improving the quality and production efficiency of metal wire drawing. Utility Model Content
[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a special diamond wire drawing die for multi-head drawing. The die has a reasonable structural design and achieves stable quality of multi-head drawn wires and extends die life by more than 30% through a three-section compression orifice, polycrystalline diamond die core, and efficient lubrication and heat dissipation design.
[0004] To achieve the above objectives, this utility model employs the following technical solution: a multi-head diamond wire drawing die, comprising a stainless steel die sleeve, a diamond die core, a sintered body, and a die cover. The diamond die core is housed within the stainless steel die sleeve, and the space between the diamond die core and the stainless steel die sleeve is filled with the sintered body. The inlet end of the stainless steel die sleeve is secured to the diamond die core within the stainless steel die sleeve via the die cover, with the stainless steel die sleeve and die cover having an interference fit. The stainless steel die sleeve has a flared wire inlet and outlet hole at both ends, respectively. A die cavity exists between the inlet and outlet holes, comprising an inlet area, a lubrication area, a compression area, a sizing area, and an outlet area. The compression area comprises a first compression area, a second compression area, and a third compression area. The compression angle of the first compression area is 17°-19°, the compression angle of the second compression area is 15°-17°, and the compression angle of the third compression area is 13°-15°. The length of the sizing area 74 is 0.25 to 0.35 times the target diameter D of the wire.
[0005] Preferably, the diamond mold core is a polycrystalline diamond mold core.
[0006] Preferably, the sintered body is a metal powder sintered layer, used to fix the diamond mold core and transmit stress.
[0007] Preferably, the inner wall of the lubrication zone is provided with a spiral oil groove with a depth of 0.1-0.3 mm, a pitch of 5-8 mm, and an angle of 30°-45° between the oil groove and the axis of the die hole.
[0008] Preferably, the inner wall of the mold cover is provided with an elastic buffer layer to absorb the impact vibration during the drawing process.
[0009] Preferably, the diamond mold core has a rounded corner at the entrance edge with a radius of 0.5-1.0 mm, and a chamfer of 0.3×45° at the exit edge.
[0010] The beneficial effects of this utility model are:
[0011] 1. This utility model adopts a three-section compression zone design (compression angle 17°-19°, 15°-17°, 13°-15°), combined with the sizing zone length (0.25-0.35D), which can be adapted to the deformation requirements according to the wire reduction ratio, reducing stress concentration during the drawing process and effectively avoiding wire breakage; the inner wall roughness of the polycrystalline diamond die core is ≤Ra0.02μm and the nano-diamond coating (hardness ≥HV3000) significantly improves the surface finish and dimensional accuracy of the wire.
[0012] 2. The polycrystalline diamond mold core has both high hardness and wear resistance. Combined with a metal powder sintered layer containing nano-tungsten carbide particles, it enhances the uniformity of stress transmission and avoids local cracking of the mold core. The stainless steel mold sleeve has annular cooling water channels and turbulence columns on the outer wall, which can quickly dissipate the heat of drawing and reduce the risk of high-temperature wear of the mold core. The mold life is increased by more than 30% compared with the traditional structure.
[0013] 3. The elastic buffer layer of the mold cover (made of polytetrafluoroethylene) absorbs the pulling vibration, reduces noise and protects the mold core; the overall structural design takes into account the precision and strength of the mold, and can meet the needs of simultaneous pulling of multiple wires in multi-head wire drawing scenarios. Through stable stress distribution and lubrication control, it ensures the consistency of multiple wire dimensions and improves the finished product qualification rate to over 98%. Attached Figure Description
[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the mold hole of this utility model. Detailed Implementation
[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0018] Reference Figure 1-2 This specific embodiment adopts the following technical solution: a multi-head diamond wire drawing die, including a stainless steel die sleeve 1, a diamond die core 2, a sintered body 3, and a die cover 4. The diamond die core 2 is disposed inside the stainless steel die sleeve 1, and the sintered body 3 fills the space between the diamond die core 2 and the stainless steel die sleeve 1. The diamond die core 2 is fixed inside the stainless steel die sleeve 1 by the die cover 4, and the stainless steel die sleeve 1 and the die cover 4 are interference-fitted. The two ends of the stainless steel die sleeve 1 are respectively provided with a trumpet-shaped wire inlet hole 5 and a wire outlet hole. Between hole 6, inlet hole 5, and outlet hole 6 is die hole 8. Die hole 8 includes inlet area 71, lubrication area 72, compression area 73, sizing area 74, and outlet area 75. Compression area 73 includes a first compression area, a second compression area, and a third compression area. The compression angle of the first compression area is 17°-19°, the compression angle of the second compression area is 15°-17°, and the compression angle of the third compression area is 13°-15°. The length of sizing area 74 is 0.25 to 0.35 times the target diameter D of the wire.
[0019] It is worth noting that the diamond core 2 is a polycrystalline diamond core.
[0020] It is worth noting that the sintered body 3 is a metal powder sintered layer, which is used to fix the diamond mold core and transmit stress.
[0021] It is worth noting that the inner wall of the lubrication zone 72 is provided with a spiral oil groove with a depth of 0.1-0.3 mm and a pitch of 5-8 mm, and the angle between the oil groove and the axis of the die hole 7 is 30°-45°.
[0022] It is worth noting that the inner wall of the mold cover 4 is provided with an elastic buffer layer to absorb the impact vibration during the drawing process.
[0023] In addition, the diamond mold core 2 has a rounded corner at the entrance edge with a radius of 0.5-1.0 mm, and a chamfer of 0.3×45° at the exit edge.
[0024] This specific implementation adopts a combination structure of stainless steel jacket and diamond die core, which takes into account both high precision and long service life of the die; through repeated experiments, a suitable die shape for drawing metal wire was designed, in which the compression angle is designed in segments according to the reduction rate (first segment 18°±1°, second segment 16°±1°, third segment 14°±1°), and the sizing zone length is designed to be 0.25-0.35D, which effectively ensures that the wire does not break during drawing; at the same time, through precise control of the processing technology, the dimensional accuracy and surface finish of the drawing are ensured.
[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A diamond wire drawing die for multi-head drawing, characterized in that, The system includes a stainless steel mold sleeve (1), a diamond mold core (2), a sintered body (3), and a mold cover (4). The diamond mold core (2) is disposed inside the stainless steel mold sleeve (1), and the sintered body (3) is filled between the diamond mold core (2) and the stainless steel mold sleeve (1). The diamond mold core (2) is fixed inside the stainless steel mold sleeve (1) by the mold cover (4), and the stainless steel mold sleeve (1) and the mold cover (4) are interference-fitted. The stainless steel mold sleeve (1) has a flared wire inlet hole (5) and a wire outlet hole (6) at both ends. The wire inlet hole (5) is... Between the wire and the outlet hole (6) is a die hole (7), which includes an inlet area (71), a lubrication area (72), a compression area (73), a sizing area (74) and an outlet area (75). The compression area (73) includes a first compression area, a second compression area and a third compression area. The compression angle of the first compression area is 17°-19°, the compression angle of the second compression area is 15°-17°, and the compression angle of the third compression area is 13°-15°. The length of the sizing area (74) is 0.25 to 0.35 times the target diameter D of the wire.
2. The multi-head diamond wire drawing die according to claim 1, characterized in that, The diamond core (2) mentioned above is a polycrystalline diamond core.
3. The multi-head diamond wire drawing die according to claim 1, characterized in that, The sintered body (3) is a metal powder sintered layer used to fix the diamond mold core and transmit stress.
4. The multi-head diamond wire drawing die according to claim 1, characterized in that, The inner wall of the lubrication area (72) is provided with a spiral oil groove with a depth of 0.1-0.3 mm and a pitch of 5-8 mm. The angle between the oil groove and the axis of the mold hole (8) is 30°-45°.
5. The multi-head diamond wire drawing die according to claim 1, characterized in that, The inner wall of the mold cover (4) is provided with an elastic buffer layer to absorb the impact vibration during the drawing process.
6. The multi-head diamond wire drawing die according to claim 1, characterized in that, The diamond mold core (2) has a rounded corner at the entrance end with a radius of 0.5-1.0 mm, and a chamfer of 0.3×45° at the exit end.