Novel aluminum-clad invar wire drawing die

Abstract

The utility model relates to the technical field of metal drawing, and provides a novel aluminum-clad invar wire drawing die which comprises a pressure die provided with a pressure channel; the wire drawing die is provided with a die core, the die core comprises a first die core, the first die core is connected with the pressure die, the first die core is provided with a first wire drawing channel, and the first wire drawing channel can be communicated with the pressure channel; the second die core is provided with a second wire drawing channel, the second wire drawing channel communicates with the first wire drawing channel, and a wear-resistant coating is arranged on the surface of the second wire drawing channel; the double-die-core structure is adopted, no coating is arranged on the first die core, die damage caused by coating cracking in the assembling and disassembling process is avoided, the abrasion-resistant coating is arranged on the surface of the second wire drawing channel of the second die core, the high abrasion resistance of the abrasion-resistant coating is utilized, the friction loss between the die cores and the aluminum-clad invar steel wire in the drawing process is effectively reduced, and the production efficiency is improved. The overall service life of the die is greatly prolonged, the cost consumption is reduced, and the strict quality requirement for the aluminum-clad invar steel wire is met.

Description

Technical Field

[0001] The utility model relates to the technical field of metal drawing, in particular to a novel aluminum-clad Invar wire drawing die. Background Art

[0002] Aluminum-clad Invar wire is a bimetallic material made by continuously extruding and cladding Invar steel wire and aluminum. It boasts high strength and corrosion resistance, making it a key material for overhead lines. Its simultaneous drawing process requires not only a combination of a pressure die and a drawing die, but also a lubricant (lubricating powder or oil). The primary tool for drawing aluminum-clad Invar wire is the drawing die. Due to the high strength of aluminum-clad Invar, conventional drawing dies have a relatively short service life.

[0003] Currently, the industry mainly uses tungsten steel drawing dies for aluminum-clad Invar wire drawing. The die sleeve is made of 45# steel or HT10, and the die core is made of YG8 or YG12. Due to the high strength of aluminum-clad Invar wire, the wear resistance of the tungsten steel die core surface cannot meet the requirements of aluminum-clad Invar wire drawing. When drawing high-strength aluminum-clad Invar wire, the shortest life of the die is only 8 kilometers. The die core surface is roughened, and the inner surface of the die core is roughened, which will cause the surface of the aluminum-clad Invar wire to be roughened, thereby making the entire reel of aluminum-clad Invar wire scrapped, resulting in waste loss during the drawing production process. The longest drawing mileage is only 300 kilometers, and the die core will crack and be scrapped, resulting in low die service life and production efficiency. Utility Model Content

[0004] The utility model provides a novel aluminum-clad Invar wire drawing die, which is used to solve the defect of short life of the drawing die in the prior art, improve the drawing quality of the aluminum-clad Invar wire, and reduce the production cost of the aluminum-clad Invar wire.

[0005] The utility model provides a novel aluminum-clad Invar wire drawing die, comprising:

[0006] A pressure die is provided with a pressure channel;

[0007] The wire drawing die is provided with a die core, and the die core comprises:

[0008] a first mold core, the first mold core being connected to the pressure mold, the first mold core being provided with a first wire drawing channel, and the first wire drawing channel being able to communicate with the pressure channel;

[0009] The second mold core is provided with a second wire drawing channel, the second wire drawing channel is communicated with the first wire drawing channel, and the surface of the second wire drawing channel is provided with a wear-resistant coating.

[0010] According to a novel aluminum-clad Invar wire drawing die provided by the utility model, the drawing die further comprises:

[0011] A mold sleeve is provided with an installation cavity inside the mold sleeve, and the first mold core and the second mold core are arranged in the installation cavity.

[0012] According to a novel aluminum-clad Invar wire drawing die provided by the utility model, the pressure die and the first die core are connected by a compression assembly method.

[0013] According to a novel aluminum-clad Invar wire drawing die provided by the utility model, the first die core and the second die core are both made of tungsten steel.

[0014] According to the novel aluminum-clad Invar wire drawing die provided by the utility model, the wear-resistant coating on the surface of the second wire drawing channel is a nano-diamond coating.

[0015] According to a novel aluminum-clad Invar wire drawing die provided by the present invention, the second wire drawing channel includes:

[0016] Sizing belt;

[0017] The compression zone is arranged between the sizing belt and the first mold core. The diameter of the compression zone gradually decreases from one end toward the first mold core to the end away from the first mold core. The length L2 of the compression zone is greater than the length L1 of the sizing belt.

[0018] According to the novel aluminum-clad Invar wire drawing die provided by the utility model, the compression angle α of the compression zone is 11°-12°.

[0019] According to a new aluminum-clad Invar wire drawing die provided by the utility model, when the diameter D of the sizing belt is ≥3mm, the length L2 of the compression zone is between 6.5mm-8mm; when the diameter D of the sizing belt is <3mm, the length L2 of the compression zone is between 3mm-5mm.

[0020] According to the aluminum new type aluminum clad Invar wire drawing die provided by the utility model, when the aluminum clad Invar wire is preliminarily processed, the length of the sizing belt is .

[0021] According to the aluminum new type aluminum clad Invar wire drawing die provided by the utility model, when the aluminum clad Invar wire is processed into a finished product, the length of the sizing belt is .

[0022] The utility model provides a new type of aluminum-clad Invar wire drawing die, which includes a pressure die and a drawing die, wherein the pressure die is provided with a pressure channel; the drawing die is provided with a die core, and the die core includes a first die core and a second die core, the first die core is connected to the pressure die, and the first die core is provided with a first drawing channel, and the first drawing channel can be connected to the pressure channel; the second die core is provided with a second drawing channel, the second drawing channel is connected to the first drawing channel, and the surface of the second drawing channel is provided with a wear-resistant coating.

[0023] It can be seen from the above scheme that the drawing die of the utility model adopts a dual-core structure. The first core is used to be directly connected to the pressure die. Since the two are repeatedly disassembled and assembled, no coating is set on the first core, which avoids damage to the mold due to cracking of the coating during assembly and disassembly. A wear-resistant coating is set on the surface of the second drawing channel of the second core. By utilizing its high wear resistance, the friction loss between the core and the aluminum-clad Invar wire during the drawing process is effectively reduced, thereby greatly improving the overall service life of the mold and reducing the cost consumption caused by frequent mold replacement; and when the mold needs maintenance or some parts are damaged, only the damaged single core needs to be replaced, rather than the entire core assembly, which reduces the maintenance difficulty and maintenance cost and improves the continuity and efficiency of production.

[0024] In addition, since the wear-resistant coating of the second die core not only improves the wear resistance, but also ensures the stable dimensional accuracy of the second drawing channel during the drawing process, the aluminum-clad Invar wire is initially drawn and guided through the first drawing channel, and then further accurately drawn through the second drawing channel. Combined with the high-precision constraint of the wear-resistant coating, the wire diameter tolerance of the aluminum-clad Invar wire is effectively controlled, the dimensional accuracy and surface quality of the drawn product are improved, and the strict quality requirements for aluminum-clad Invar wire are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a cross-sectional view of a novel aluminum-clad Invar wire drawing die provided by an embodiment of the present utility model.

[0027] Figure 2 The figure is a cross-sectional view of an aluminum-clad Invar wire drawing die in the prior art.

[0028] Reference numerals:

[0029] 1. Pressure die; 11. Pressure channel; 2. Drawing die; 3. First die core; 4. Second die core; 5. Die sleeve. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figure 2 As shown, an aluminum-clad Invar wire drawing die provided by the prior art is provided. The pressure die 1 and the drawing die 2 are pressed and assembled. The die mouth of the pressure die 1 presses against the assembly contact area of ​​the die core of the drawing die 2 and is tightly fitted for sealing. During drawing, the drawing powder is introduced through the pressure die 1 and then enters the drawing die 2 for drawing. The aluminum-clad Invar wire drawing process passes through the compression and sizing area of ​​the drawing die 2 to draw the aluminum-clad Invar wire of the required specifications.

[0032] The following combination Figure 1 The utility model describes a novel aluminum-clad Invar wire drawing die.

[0033] An embodiment of the present utility model provides a new type of aluminum-clad Invar wire drawing die, including a pressure die 1 and a drawing die 2, wherein the pressure die 1 is provided with a pressure channel 11; the drawing die 2 is provided with a die core, the die core includes a first die core 3 and a second die core 4, the first die core 3 is connected to the pressure die 1, the first die core 3 is provided with a first drawing channel, and the first drawing channel can be connected to the pressure channel 11; the second die core 4 is provided with a second drawing channel, the second drawing channel is connected to the first drawing channel, and the surface of the second drawing channel is provided with a wear-resistant coating.

[0034] It can be seen from the above scheme that the drawing die of the utility model adopts a dual-core structure. The first core 3 is used to be directly connected to the pressure die 1. Since the two are repeatedly disassembled and assembled, no coating is set on the first core 3, thereby avoiding damage to the mold due to cracking of the coating during assembly and disassembly. A wear-resistant coating is set on the surface of the second drawing channel of the second core 4. By utilizing its high wear resistance, the friction loss between the core and the aluminum-clad Invar wire during the drawing process is effectively reduced, thereby greatly improving the overall service life of the mold and reducing the cost consumption caused by frequent mold replacement; and when the mold needs maintenance or some parts are damaged, only the damaged single core needs to be replaced, rather than the entire core assembly, which reduces the maintenance difficulty and maintenance cost and improves the continuity and efficiency of production.

[0035] In addition, since the wear-resistant coating of the second mold core 4 not only improves the wear resistance, but also ensures that the dimensional accuracy of the second drawing channel is stable during the drawing process, the aluminum-clad Invar wire is initially drawn and guided through the first drawing channel, and then further accurately drawn through the second drawing channel. Combined with the high-precision constraint of the wear-resistant coating, the wire diameter tolerance of the aluminum-clad Invar wire is effectively controlled, the dimensional accuracy and surface quality of the product after drawing are improved, and the strict quality requirements for aluminum-clad Invar wire are met.

[0036] Aluminum-clad Invar is a composite material that combines the low thermal expansion properties of Invar (iron-nickel alloy) with the lightweight and corrosion-resistant properties of aluminum. An aluminum layer is coated on the surface of Invar through rolling, explosive lamination or hot dipping, making it lightweight, corrosion-resistant and thermally conductive.

[0037] The above-mentioned wear-resistant coating can be a nano-diamond coating. The nano-diamond coating has extremely high hardness and wear resistance, can effectively resist the wear of the aluminum-clad Invar wire on the mold, and greatly extend the service life of the mold. Compared with the traditional drawing die 2, the use of the mold with nano-diamond coating has increased the drawing mileage from the original 100-300 kilometers to 2905 kilometers, significantly reducing the frequency of mold replacement and improving production efficiency.

[0038] In this embodiment, the first mold core 3 and the second mold core 4 are both made of tungsten steel YG12, taking advantage of its high hardness, high strength, good wear resistance and heat resistance. Optionally, cemented carbide, high-speed steel, ceramic materials, etc. can also be used to replace tungsten steel.

[0039] In this way, by designing the mold core as a structure with a separate first mold core 3 and a second mold core 4, and the mold core is made of a material that is not easily damaged, compared with the traditional one-piece coated mold core, the problem of easy cracking of the coating in the assembly contact area between the mold core and the pressure mold 1 is solved. When the mold needs maintenance or some parts are damaged, only the damaged single mold core needs to be replaced, rather than the entire mold core assembly, which reduces the maintenance difficulty and maintenance cost and improves the continuity and efficiency of production.

[0040] In this embodiment, the wire drawing die 2 further includes a die sleeve 5, the die sleeve 5 is provided with an installation cavity, and the first die core 3 and the second die core 4 are provided in the installation cavity. Figure 1 As shown, the first mold core 3 and the second mold core 4 are axially adjacently arranged in the installation cavity. By setting the installation cavity inside the mold sleeve 5 and installing the first mold core 3 and the second mold core 4 therein, a stable support structure can be provided for the mold core. The installation cavity can effectively limit the movement of the mold core, ensuring that it is fixed in position during operation, so that the aluminum-clad Invar wire can accurately pass through the drawing channel in the mold core, ensuring the drawing dimensional accuracy.

[0041] In some specific embodiments, the pressure die 1 is connected to the first mold core 3 by means of compression assembly. For example, the pressure die 1 and the first mold core 3 can be compressed and assembled by means of interference fit, so that the two remain tightly connected during the drawing process, ensuring the stability of pressure transmission; or, the pressure die 1 and the first mold core 3 are assembled by axial compression, and axial force is applied by means of bolts or other fastening devices to firmly press the pressure die 1 on the first mold core 3 to prevent loosening during the drawing process; or, the pressure die 1 and the first mold core 3 can be compressed and assembled in a nested form, with the outer surface of the end of the pressure die 1 tightly fitting with the inner surface of the port of the first mold core 3, and interference nesting is achieved through reasonable tolerance design to ensure the tightness of the assembly.

[0042] like Figure 1 As shown, a conical plug-in portion is provided at the end of the pressure die 1, and the port of the first mold core 3 is adapted to the conical plug-in portion, and the two are assembled together by pressing after being plugged in; wherein, the portion where the first mold core 3 is connected to the pressure die 1 is defined as the assembly contact area.

[0043] In this embodiment, the second drawing channel includes a sizing belt and a compression zone, wherein the compression zone is arranged between the sizing belt and the first mold core 3, and the diameter of the compression zone gradually decreases from one end toward the first mold core 3 to the end away from the first mold core 3. The length L2 of the compression zone is greater than the length L1 of the sizing belt, wherein the part where the sizing belt and the compression zone are located is defined as the compression sizing zone.

[0044] In this embodiment, due to the uniform and fine microstructure of the nanodiamond coating, it can provide precise dimensional constraints for the aluminum-clad Invar wire in the compression and sizing zone of the mold. As the aluminum-clad Invar wire passes through the nanodiamond-coated mold core, it can be accurately compressed and sized. The wire diameter tolerance variation rate (0.01 mm / 100 km, with a permitted variation of 0.01 mm per 100 km of length) is reduced from 1.66 times to 0.02 times, resulting in higher dimensional accuracy for the drawn aluminum-clad Invar wire, better meeting the stringent requirements for aluminum-clad Invar wire in overhead lines and other applications.

[0045] It should be noted that when drawing metal wires such as aluminum-clad Invar wire, drawing powder is indispensable. Drawing powder can be firmly adsorbed on the surface of the metal wire. When the wire enters the drawing die 2, it builds a lubricating film between the metal wire and the die wall of the drawing die 2, effectively reducing the friction between the interfaces. During the drawing process of the aluminum-clad Invar wire, this lubricating film can reduce the energy consumption during drawing, prevent the metal wire from sticking to the die wall due to heat, avoid problems such as fuzzing on the surface of the aluminum-clad Invar wire, and ensure the stability of the drawing process and the surface quality of the wire.

[0046] In this embodiment, the compression angle α of the compression zone is set to 11°-12°, which is larger than the compression angle in the traditional technology. It is more conducive to the introduction of drawing powder during the drawing process of aluminum-clad Invar steel and improves the lubrication effect during the steel wire drawing process.

[0047] With this arrangement, the larger compression angle makes the die entrance space relatively larger, providing a more favorable channel for the drawing powder to enter the die during the drawing process. The drawing powder can enter the die more smoothly along with the aluminum-clad Invar wire, thereby ensuring an adequate supply of lubricating medium during the drawing process, ensuring that a good lubricating film is formed between the steel wire and the die, and reducing the friction coefficient.

[0048] Moreover, after the compression angle increases, the drawing powder is more evenly distributed inside the die. During the drawing process, the surface of the steel wire can be more fully in contact with the drawing powder, making the lubricating film cover the surface of the steel wire more complete, reducing the wear of the die and extending the service life of the die.

[0049] Furthermore, when the diameter D of the sizing belt is ≥3 mm, the length L2 of the compression zone is between 6.5 mm and 8 mm; when the diameter D of the sizing belt is less than 3 mm, the length L2 of the compression zone is between 3 mm and 5 mm.

[0050] In this embodiment, when the aluminum-clad Invar wire is preliminarily processed, the length of the sizing tape is In the case of finished aluminum-clad Invar wire, the sizing tape length .

[0051] Specifically, compared with traditional technology, the length L2 of the compression zone of the drawing die provided by the present invention is adjusted from 4.5mm-7.5mm to 6.5mm-8mm when the die diameter D≥3mm, and from 2.3mm-4.5mm to 3mm-5mm when D<3mm, which is more conducive to the coating effect of wire drawing powder on the surface of the steel wire during the drawing process of aluminum-clad invar steel wire.

[0052] Length of the sizing strip in the process die Adjust to , the length of the sizing strip in the finished mold Adjust to , improve the powder coating effect of aluminum-clad Invar during drawing.

[0053] It should be noted that both the process die and the finished product die are the aforementioned new aluminum-clad Invar wire drawing dies, the only difference being the length L1 of the sizing band. The process die is used in the early stages of aluminum-clad Invar wire drawing and is primarily used for preliminary processing of the aluminum-clad Invar wire. Its function is to gradually reduce the diameter of the aluminum-clad Invar wire to bring it closer to the size specifications of the final product. During this process, the size of the aluminum-clad Invar wire changes significantly, requiring multiple passes through process dies of different specifications for drawing. The length of the sizing band of the process die was originally , now adjusted to This adjustment is conducive to improving the powder coating effect of aluminum-clad Invar during the drawing process, so as to better carry out preliminary processing of the aluminum-clad Invar wire and prepare for the subsequent finished mold processing.

[0054] Finished product mold is used to carry out final fine processing on aluminum clad Invar wire after it has been drawn through process mold, so that the aluminum clad Invar wire reaches the final finished product size and quality requirements. At this time, the diameter of the aluminum clad Invar wire is close to the finished product standard. The main task of the finished product mold is to further accurately control the dimensional accuracy and surface quality of the aluminum clad Invar wire. The length of the sizing belt is Adjust to This change is also intended to optimize the powdering effect during the drawing process, ensure the quality of the aluminum-clad Invar wire in the finished product stage, and meet the high-precision requirements of aluminum-clad Invar wire in application scenarios such as overhead lines.

[0055] The utility model optimizes the drawing process by adjusting the drawing powder-applying related parameters. Specifically, by adjusting the three parameters closely related to the drawing powder-applying effect, namely the compression angle α, the length L2 of the compression zone, and the length L1 of the sizing belt, the compression angle α is increased to 11°-12°, which is more conducive to the introduction of drawing powder; the reasonable adjustment of the length L2 of the compression zone can enhance the coating effect of the drawing powder on the surface of the steel wire; changing the length L1 of the sizing belt improves the powder-applying effect of the aluminum-clad Invar steel during the drawing process, and ultimately improves the die drawing performance, the drawing precision tolerance and the wear resistance.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A new type of aluminum-clad Invar wire drawing die, characterized in that: include: A pressure mold (1) is provided with a pressure channel (11); The wire drawing die (2) is provided with a die core, and the die core comprises: A first mold core (3), the first mold core (3) being connected to the pressure mold (1), the first mold core (3) being provided with a first wire drawing channel, and the first wire drawing channel being able to communicate with the pressure channel (11); The second mold core (4) is provided with a second wire drawing channel, the second wire drawing channel is communicated with the first wire drawing channel, and the surface of the second wire drawing channel is provided with a wear-resistant coating.

2. A novel aluminum-clad Invar wire drawing die according to claim 1, characterized in that: The wire drawing die (2) further comprises: A mold sleeve (5), wherein a mounting cavity is provided inside the mold sleeve (5), and the first mold core (3) and the second mold core (4) are arranged in the mounting cavity.

3. A novel aluminum-clad Invar wire drawing die according to claim 2, characterized in that: The pressure mold (1) and the first mold core (3) are connected by means of compression assembly.

4. A novel aluminum-clad Invar wire drawing die according to claim 1 or 2, characterized in that: The first mold core (3) and the second mold core (4) are both made of tungsten steel.

5. A novel aluminum-clad Invar wire drawing die according to claim 1 or 2, characterized in that: The wear-resistant coating on the surface of the second drawing channel is a nano-diamond coating.

6. A novel aluminum-clad Invar wire drawing die according to claim 5, characterized in that: The second drawing channel comprises: Sizing belt; A compression zone is provided between the sizing belt and the first mold core (3), wherein the diameter of the compression zone gradually decreases from one end toward the first mold core (3) to the end away from the first mold core (3), and the length L2 of the compression zone is greater than the length L1 of the sizing belt.

7. A novel aluminum-clad Invar wire drawing die according to claim 6, characterized in that: The compression angle α of the compression zone is 11°-12°.

8. A novel aluminum-clad Invar wire drawing die according to claim 6, characterized in that: When the diameter D of the sizing belt is ≥3 mm, the length L2 of the compression zone is between 6.5 mm and 8 mm; when the diameter D of the sizing belt is less than 3 mm, the length L2 of the compression zone is between 3 mm and 5 mm.

9. A novel aluminum-clad Invar wire drawing die according to claim 6, characterized in that: In the case of preliminary processing of the aluminum-clad Invar wire, the length of the sizing tape .

10. A novel aluminum-clad Invar wire drawing die according to claim 6, characterized in that: When the aluminum-clad Invar wire is processed into finished products, the length of the sizing tape is .

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