A poly-crystal strand die

Abstract

The utility model discloses a kind of polycrystal stranded wire dies, it relates to wire rod drawing die technical field. Including die sleeve, die core, sintered body and die cover, die sleeve is hollow cylinder structure, the die core adopts polycrystal silicon-based coarse particle die core, the die core is fixed in die sleeve by sintered body, the die cover is covered in die sleeve end portion and with sintered body abuts to each other;The die cover and sintered body are embedded by barb and cooperate, die cover and die sleeve interference fit or thread cooperation.The utility model realizes the balance of processing convenience, high accuracy, long life and low cost, improves metal wire rod drawing efficiency and surface quality.

Description

Technical Field

[0001] This utility model relates to the field of metal wire drawing die technology, specifically to a polycrystalline stranded wire die. Background Technology

[0002] Existing wire drawing dies mostly use single-crystal diamond or fine-grained polycrystalline diamond materials. Although they offer high precision, they suffer from problems such as high processing difficulty, high cost, and limited lifespan. Furthermore, traditional stranding die designs often suffer from poor lubrication and improper compression angles, leading to surface scratches and insufficient dimensional accuracy in the wire. Therefore, there is an urgent need to develop a polycrystalline stranding die that is easy to process, low in cost, and can guarantee wire quality. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a polycrystalline stranding die that achieves a balance between processing convenience, high precision, long life and low cost, and improves the drawing efficiency and surface quality of metal wires.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a polycrystalline stranded wire mold, comprising a mold sleeve, a mold core, a sintered body, and a mold cover. The mold sleeve has a hollow cylindrical structure. The mold core is made of polycrystalline silicon-based coarse-particle mold core. The mold core is fixed inside the mold sleeve by the sintered body. The mold cover is fitted onto the end of the mold sleeve and abuts against the sintered body. The mold cover and the sintered body are engaged by a barb, and the mold cover and the mold sleeve are either interference-fitted or threaded.

[0005] Preferably, the core has a wire stranding hole at its center. The wire stranding hole has a hole shape that includes a flared section, a compression section, and a sizing section. The inlet diameter of the flared section is larger than the outlet diameter. The compression angle of the compression section is 19°-21°. The length of the sizing section is 0.3-0.4 times the wire diameter.

[0006] Preferably, the inner wall of the flared section is provided with a lubrication groove, which extends axially along the stranding hole and communicates with the compression section.

[0007] Preferably, the inner wall of the mold sleeve is provided with a positioning groove, the outer periphery of the sintered body is provided with a flange that matches the positioning groove, and the mold core is fixed at the center of the sintered body.

[0008] Preferably, the center of the mold cover has a through hole coaxial with the stranding hole, and the diameter of the through hole is larger than the inlet diameter of the stranding hole of the mold core.

[0009] Preferably, the outer wall of the mold sleeve is provided with heat dissipation fins, which are evenly distributed along the axial direction of the mold sleeve.

[0010] Preferably, the surface of the mold core is provided with a wear-resistant coating, the thickness of which is 0.01-0.03 mm.

[0011] The beneficial effects of this utility model are:

[0012] 1. Applying coarse-grained polycrystalline silicon-based materials to stranded wire cores breaks through the traditional perception that "fine particles = high precision". By matching material particle size with processing technology, low cost and high precision are achieved.

[0013] 2. A combination of "large lubrication at the flared opening + 20° compression angle + short sizing section" is proposed to solve the problems of insufficient lubrication and difficulty in achieving both dimensional accuracy and surface quality in traditional hole types.

[0014] 3. Synergistic design of core material and hole structure: The high rigidity of coarse-grained material combined with the low resistance of optimized hole structure increases wire drawing speed by 15%, and the surface is free of dents and scratches;

[0015] 4. Innovative design of sizing section length (0.3-0.4D): shorter than the industry standard of 0.5-0.6D, reducing the contact time between the wire and the die core, and reducing material wear caused by heat accumulation. Attached Figure Description

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the stranding hole of this utility model. Detailed Implementation

[0019] 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.

[0020] Reference Figure 1-2 The specific embodiment adopts the following technical solution: including a mold sleeve 1, a mold core 2, a sintered body 3, and a mold cover 4. The mold sleeve 1 is a hollow cylindrical structure. The mold core 2 is a polycrystalline silicon-based coarse particle mold core. The mold core 2 is fixed inside the mold sleeve 1 by the sintered body 3. The mold cover 4 covers the end of the mold sleeve 1 and abuts against the sintered body 3. The mold cover 4 and the sintered body 3 are embedded and fitted by barbs 5. The mold cover 4 and the mold sleeve 1 are either interference-fitted or threaded.

[0021] It is worth noting that the core 2 has a wire stranding hole 6 in the center. The hole shape of the stranding hole includes a flared section 7, a compression section 8 and a sizing section 9 in sequence. The inlet diameter of the flared section 7 is larger than the outlet diameter. The compression angle of the compression section 8 is 19°-21°. The length of the sizing section 9 is 0.3-0.4 times the diameter of the wire.

[0022] It is worth noting that the inner wall of the flared section 7 is provided with a lubrication groove, which extends axially along the stranding hole and communicates with the compression section 8.

[0023] It is worth noting that the inner wall of the mold sleeve 1 is provided with a positioning groove 10, and the outer periphery of the sintered body 3 is provided with a flange 11 that matches the positioning groove 10. The mold core 2 is fixed at the center of the sintered body 3.

[0024] It is worth noting that the center of the mold cover 4 has a through hole coaxial with the stranding hole, and the diameter of the through hole is larger than the inlet diameter of the stranding hole of the mold core.

[0025] It is worth noting that the outer wall of the mold sleeve 1 is provided with heat dissipation fins, which are evenly distributed along the axial direction of the mold sleeve 1.

[0026] In addition, the surface of the mold core 2 is provided with a wear-resistant coating, the thickness of which is 0.01-0.03mm.

[0027] In this specific embodiment, the mold sleeve 1 is made of 45# steel with a hollow cylindrical structure. The inner wall is machined with an annular positioning groove 10, and the outer wall has 6-8 heat dissipation fins (5-8mm high, 1.5mm thick) evenly distributed along the axial direction, which can quickly dissipate the heat generated during the drawing process and prevent the mold core 2 from softening due to high temperature. The mold sleeve 1 has an internal thread section (which mates with the mold cover 4) and a positioning step (for mold installation) at both ends. The mold core 2 is made of polycrystalline silicon-based coarse-particle material (particle size 10-50μm) pressed and sintered, with a metal wire stranding hole 6 opened in the central axial direction. The outer surface of the mold core 2 is covered with a 0.01-0.03mm thick tungsten carbide wear-resistant coating through plasma spraying, with a hardness of HV1200-1500 and a 40% improvement in wear resistance. The mold core 2 and the sintered body 3 are fixed by hot pressing, and the coaxiality error between the two is ≤0.005mm. Trumpet Section 7: Inlet diameter D1 = (1.5-2.0) × wire diameter D. Three spiral lubrication grooves (semi-circular cross-section, 0.5mm diameter, 10mm lead) are machined on the inner wall. The lubrication grooves extend from the inlet to the starting end of Compression Section 8, storing lubricating oil and forming a continuous oil film to reduce the friction coefficient between the metal wire and the die core to below 0.15. Compression Section 8: The angle between the generatrix and the axis (compression angle) α = 20° ± 1°, using a hyperbolic cosine curve transition to ensure uniform stress distribution during deformation and avoid surface cracks. The length of the compression section L1 = (5-8) × D, meeting the plastic deformation requirements of high-hardness wires (such as stainless steel wire).

[0028] The working principle of this specific embodiment is as follows: The metal wire enters through the through hole of the mold cover 4, is fully lubricated by the lubrication groove of the flared section 7, undergoes plastic deformation (reduction of cross-sectional area) in the compression section 8, and is finally shaped by the sizing section 9, completing the drawing process. The heat dissipation fins dissipate frictional heat in real time, preventing the mold core 2 from overheating; the wear-resistant coating and the spiral lubrication groove work together to extend the mold core life to more than 120,000 cycles (50% higher than traditional mold cores).

[0029] 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 polycrystalline stranded wire mold, comprising a mold sleeve (1), a mold core (2), a sintered body (3), and a mold cover (4), characterized in that, The mold sleeve (1) is a hollow cylindrical structure. The mold core (2) is a polycrystalline silicon-based coarse particle mold core. The mold core (2) is fixed inside the mold sleeve (1) by a sintered body (3). The mold cover (4) covers the end of the mold sleeve (1) and abuts against the sintered body (3). The mold cover (4) and the sintered body (3) are embedded and fitted by a barb (5). The mold cover (4) and the mold sleeve (1) are either interference fit or threaded fit.

2. The polycrystalline stranded wire mold according to claim 1, characterized in that, The core (2) has a metal wire stranding hole (6) in the center. The hole shape includes a flared section (7), a compression section (8) and a sizing section (9) in sequence. The inlet diameter of the flared section (7) is larger than the outlet diameter. The compression angle of the compression section (8) is 19°-21°. The length of the sizing section (9) is 0.3-0.4 times the diameter of the wire.

3. The polycrystalline stranded wire mold according to claim 2, characterized in that, The inner wall of the flared section (7) is provided with a lubrication groove, which extends along the axial direction of the strand hole and is connected to the compression section (8).

4. A polycrystalline stranded wire mold according to claim 1, characterized in that, The inner wall of the mold sleeve (1) is provided with a positioning groove (10), and the outer periphery of the sintered body (3) is provided with a flange (11) that matches the positioning groove (10). The mold core (2) is fixed at the center of the sintered body (3).

5. A polycrystalline stranded wire mold according to claim 1, characterized in that, The center of the mold cover (4) is provided with a through hole coaxial with the stranding hole, and the diameter of the through hole is larger than the inlet diameter of the stranding hole of the mold core.

6. A polycrystalline stranded wire mold according to claim 1, characterized in that, The outer wall of the mold sleeve (1) is provided with heat dissipation fins, which are evenly distributed along the axial direction of the mold sleeve (1).

7. A polycrystalline stranded wire mold according to claim 1, characterized in that, The surface of the mold core (2) is provided with a wear-resistant coating, the thickness of which is 0.01-0.03mm.

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