A multi-bearing guide wheel and a high-strength fine tungsten wire drawing device

Abstract

This invention discloses a multi-bearing guide wheel, comprising at least two concentrically arranged bearings and a housing extending through and connected to the bearings. The housing has a wire-passing groove to guide the direction of the metal wire to be passed. The multi-bearing configuration ensures stability and prevents the metal wire from deviating during wire passing. Furthermore, the wire-passing groove design effectively prevents the metal wire from wobbling during passing, thus avoiding any impact on its straightness.

Description

Technical Field

[0001] This invention relates to the field of tungsten wire preparation technology, and in particular to a multi-bearing guide wheel and a high-strength fine tungsten wire drawing device. Background Technology

[0002] Tungsten wire refers to a fine wire made by forging and drawing tungsten bars. It is mainly used in electric light sources such as incandescent lamps and halogen lamps, and can also be used as a high-speed cutting alloy steel, or in optical and chemical instruments. To improve the high-temperature creep resistance of tungsten wire, small amounts of dispersion strengthening elements such as potassium, silicon, aluminum, and oxides of rare metals are usually added during the smelting process to form an interlocking internal grain structure resembling "dovetail overlaps." This type of tungsten wire is called doped tungsten wire. Doped tungsten wire is also known as 218 tungsten wire or non-sag tungsten wire.

[0003] The production process of tungsten-doped wire includes several main stages: tungsten smelting, powder metallurgy billet preparation, and plastic forming. Plastic forming primarily employs methods such as rotary forging, rolling, and drawing. During tungsten wire drawing, to avoid reducing the wire's curl, a guiding structure is usually required to limit its direction. Common guiding structures include guide wheels, where the tungsten wire passes through an annular groove on the outer surface of the guide wheel, serving a guiding function. However, the width of the annular groove in existing guide wheels is usually much larger than the tungsten wire diameter. Therefore, during rapid wire drawing, the tungsten wire is highly likely to deviate and wobble, thus affecting its straightness. Summary of the Invention

[0004] To address some or all of the problems in the prior art, the first aspect of the present invention provides a multi-bearing guide wheel, comprising:

[0005] Bearings, including at least two concentrically arranged bearings; and

[0006] The outer casing is connected through the bearing, and the outer casing is provided with a wire guide groove to guide the direction of the metal wire to be passed through.

[0007] Furthermore, the housing includes a "V"-shaped cable channel.

[0008] Furthermore, the bottom of the "V"-shaped wire groove includes an arc segment.

[0009] Furthermore, the width of the arc segment is greater than the diameter of the metal wire to be passed through.

[0010] Furthermore, the width of the arc segment is 110% to 130% of the diameter of the metal wire to be passed through.

[0011] Furthermore, the outer shell is made of a high-molecular-weight polyester material.

[0012] Based on the multi-bearing guide wheel described above, a second aspect of the present invention provides a high-strength fine tungsten wire drawing device, which includes the multi-bearing guide wheel described above.

[0013] Furthermore, the high-strength fine tungsten wire drawing equipment also includes a wire feeding module, a graphite emulsion module, a heating module, a mold module, a roller module, and a take-up module, wherein a multi-bearing guide wheel is disposed between the wire feeding module and the graphite emulsion module, and / or between the mold module and the roller module.

[0014] Furthermore, the number of multi-bearing guide wheels between the wire feeding module and the graphite emulsion module, and / or between the mold module and the tower wheel module, is equal to the number of wire drawing dies contained in the mold module.

[0015] This invention provides a multi-bearing guide wheel, which includes multiple concentrically arranged bearings, thereby ensuring stability during high-speed wire drawing and preventing tungsten wire misalignment. Furthermore, the "V"-shaped wire guide groove design effectively prevents tungsten wire wobbling during drawing, thus avoiding any impact on wire straightness. Attached Figure Description

[0016] To further illustrate the above and other advantages and features of the various embodiments of the present invention, a more specific description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It is to be understood that these drawings depict only typical embodiments of the invention and are therefore not intended to limit its scope. In the drawings, identical or corresponding parts will be indicated by identical or similar reference numerals for clarity.

[0017] Figure 1 This diagram illustrates the structure of a high-strength fine tungsten wire drawing device according to an embodiment of the present invention.

[0018] Figure 2 This diagram illustrates the structure of a high-strength fine tungsten wire drawing device according to yet another embodiment of the present invention.

[0019] Figure 3 This diagram illustrates the structure of a multi-segment heating fine tungsten wire heating module according to an embodiment of the present invention.

[0020] Figure 4 A schematic diagram of the structure of a mobile heating module according to an embodiment of the present invention is shown;

[0021] Figure 5 A schematic diagram of a heating module employing a heating tube according to an embodiment of the present invention is shown;

[0022] Figure 6 A schematic diagram of the structure of a prefabricated heating block according to an embodiment of the present invention is shown;

[0023] Figure 7A schematic diagram of the guide wheel according to an embodiment of the present invention is shown;

[0024] Figure 8 A schematic diagram of the wire feeding device according to an embodiment of the present invention is shown; and

[0025] Figure 9 A schematic diagram of the structure of a wire drawing die according to an embodiment of the present invention is shown. Detailed Implementation

[0026] In the following description, the invention is described with reference to various embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more specific details or with other alternatives and / or additional methods, materials, or components. In other instances, well-known structures, materials, or operations are not shown or described in detail so as not to obscure the inventive points of the invention. Similarly, for illustrative purposes, specific quantities, materials, and configurations are set forth to provide a comprehensive understanding of embodiments of the invention. However, the invention is not limited to these specific details. Furthermore, it should be understood that the embodiments shown in the drawings are illustrative representations and are not necessarily drawn to scale.

[0027] In this specification, references to "an embodiment" or "this embodiment" mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment of the invention. The phrase "in one embodiment" appearing throughout this specification does not necessarily refer to the same embodiment in all instances.

[0028] It should be noted that the embodiments of the present invention describe the process steps in a specific order; however, this is only for illustrating the specific embodiment and not for limiting the order of the steps. On the contrary, in different embodiments of the present invention, the order of the steps can be adjusted according to the process.

[0029] In this invention, the term "high-strength tungsten wire" refers to a tungsten wire with a tensile strength of not less than 5800 MPa. The term "fine tungsten wire" refers to a tungsten wire with a diameter of not more than 36 micrometers, particularly around 28 micrometers. For example, the fine tungsten wire of this invention can be an ultrafine tungsten wire with a diameter drawn from 0.4 mm to approximately 0.028 mm and a tensile strength of not less than 5800 MPa.

[0030] To form high-strength tungsten wires with a high-grained structure, this application improves existing tungsten wire drawing equipment, enabling the production of ultrafine tungsten wires with a diameter of no more than 36 micrometers and a tensile strength of no less than 5800 MPa. The solution of this application is further described below with reference to the accompanying drawings of the embodiments.

[0031] Figure 1 A schematic diagram of a tungsten wire drawing device according to an embodiment of the present invention is shown. Figure 1As shown, a tungsten filament drawing device includes, in sequence along the tungsten filament drawing direction, a wire feeding module 101, a graphite emulsion module 102, a heating module 103, a die module 104, a roller module 105, and a take-up module 106. To prevent the tungsten filament from swaying, a guide roller assembly 107 is provided between the wire feeding module 101 and the graphite emulsion module 102, and / or between the die module 104 and the roller module 105. The number of guide rollers in the guide roller assembly 107 is the same as the number of drawing dies included in the die module 104.

[0032] The wire feeding module 101 can adopt an active wire feeding or a passive wire feeding mode. Figure 8 A schematic diagram of the wire feeding device according to an embodiment of the present invention is shown, as follows: Figure 8 As shown, in one embodiment of the present invention, the wire feeding module 101 includes a wire feeding reel 111, a guide wheel assembly 112, a fixed rod 113, a swing rod 114, a swing wheel 115, a fixed guide wheel 116, a support frame 117, a motor 118, and a controller (not shown). The wire feeding reel 111, fixed rod 113, and fixed guide wheel 116 are all fixedly mounted on the first side of the support frame 117. The wire feeding reel 111 is used to feed tungsten wire. The guide wheel assembly 112 is fixedly mounted at the end of the fixed rod 113, including two parallel guide wheel grooves, wherein the first guide wheel groove is away from the support frame 117, and the second guide wheel groove is adjacent to the support frame 117. The swing rod 114 is movably mounted on the first side of the support frame 117. The swing wheel 115 is fixedly mounted at the end of the swing rod 114. The swing rod 114 can detect the swing angle of the swing wheel 115 and transmit the signal to the controller, which then adjusts the active wire feeding speed to balance the wire drawing speed. The balance wheel 115 is fixedly connected to the balance rod 114. A tungsten wire passes around the balance wheel 115, allowing the balance wheel 115 and the balance rod 114 to swing up and down under the pull of the tungsten wire. The motor 118 is located on the second side of the support frame 117 opposite to its first side and is fixedly connected to the pay-off reel 111 to drive the pay-off reel 111 to rotate and pay off the line. The controller controls the operation of the motor 118, including starting and stopping the motor 118 and adjusting the speed of the motor 118 according to the signal received from the balance wheel 114.

[0033] Graphite emulsion plays a lubricating and protective role in the tungsten wire processing. Poor lubrication requires greater tensile force, which in turn increases the frictional heat between the tungsten wire and the mold, leading to a smaller temperature difference between the wire entering and exiting the mold, causing wire shrinkage. Therefore, a layer of graphite emulsion is typically applied to the surface of the tungsten wire using a graphite emulsion module before drawing. In one embodiment of the present invention, the graphite emulsion module 102 includes a graphite emulsion container, a graphite emulsion tank, a water pump, a tilting plate, a first pipeline, a second pipeline, and a third pipeline. The graphite emulsion container is a cone-shaped container used to store the graphite emulsion, ensuring a residue-free flow. The graphite emulsion cylinder is used to coat the surface of tungsten wires with graphite emulsion. The upper half of the graphite emulsion cylinder has multiple arc-shaped wire-passing openings, each 3mm wide, to allow the metal wire to pass through. The graphite emulsion cylinder contains graphite emulsion, and the level of the graphite emulsion is not lower than the wire-passing openings. After the metal wire passes through the openings in the tank wall, a layer of graphite emulsion will cover its surface. The water pump provides power and is connected to the graphite emulsion container and the graphite emulsion cylinder through a second and a third pipeline to transport the graphite emulsion from the graphite emulsion container to the graphite emulsion cylinder. The tilting plate is located below the graphite emulsion cylinder and is connected to the graphite emulsion container through a first pipeline. It is used to receive the graphite emulsion flowing out of the graphite emulsion cylinder and transport the graphite emulsion to the graphite emulsion container under gravity. The length and width of the tilting plate are both greater than the length and width of the graphite emulsion cylinder. In one embodiment of the present invention, a graphite emulsion trough can be used instead of a graphite emulsion cylinder. The graphite emulsion trough has multiple opposite openings on its two opposite walls so that a metal wire can pass through it. After the metal wire passes through the wire openings on the trough wall, a layer of graphite emulsion will be covered on the surface.

[0034] Since the graphite emulsion applied to the surface of the tungsten wire by the graphite emulsion module 102 is actually a suspension of graphite powder, the tungsten wire coated with graphite emulsion needs to be heated by the heating module 103 before being fed into the mold. On the one hand, the heating module 103 can evaporate the moisture in the graphite emulsion, thereby solidifying the graphite powder on the surface of the tungsten wire. On the other hand, the heating module 103 can also bring the tungsten wire to a suitable temperature for stretching.

[0035] Since the evaporation process of water in graphite emulsion also affects the temperature of the tungsten filament, therefore, in one embodiment of the present invention, as... Figure 3As shown, the heating module 103 has at least two temperature zones along the tungsten wire. The first temperature zone is mainly for rapid evaporation of moisture, and the second temperature zone is used to regulate the temperature of the tungsten wire. To avoid excessive temperature changes affecting the elongation of the tungsten wire, in one embodiment of the invention, several temperature transition zones can also be provided between the first and second temperature zones. In one embodiment of the invention, the first temperature zone is mainly used for evaporating moisture from the graphite emulsion, and the heating of the tungsten wire is mainly accomplished through the second temperature zone. Since the temperature required for moisture evaporation is usually lower than the heating temperature of the tungsten wire, the temperature of the first temperature zone is lower than that of the second temperature zone, wherein the temperature of the second temperature zone is dynamically adjusted according to the diameter of the tungsten wire. In another embodiment of the invention, the first temperature zone is used for both evaporating moisture from the graphite emulsion and heating the tungsten wire. In this case, to rapidly evaporate moisture from the graphite emulsion, the temperature of the first temperature zone is higher than that of the second temperature zone, preferably 50°C higher. The suitable stretching temperature of the tungsten wire is usually between 350°C and 800°C, and is related to the diameter of the tungsten wire itself. Generally speaking, as the diameter of the tungsten wire decreases, the required heating temperature should continuously decrease. Based on this, in one embodiment of the present invention, the temperature T of the second temperature zone is dynamically adjusted according to the tungsten wire diameter d in the wire feeding module 101:

[0036] T = (-9*10) 3 )d 2 +(4.35*10 3 )d+305,

[0037] The tungsten wire diameter d is measured in millimeters.

[0038] In another embodiment of the present invention, when the tungsten wire needs to be stretched from 0.39 mm to 0.18 mm in diameter, the temperature of the second temperature zone can be set, for example, between 750°C and 850°C; when the tungsten wire needs to be stretched from 0.18 mm to 0.07 mm in diameter, the temperature of the second temperature zone can be set, for example, between 600°C and 700°C; and when the tungsten wire needs to be stretched from 0.07 mm to 0.03 mm in diameter, the temperature of the second temperature zone can be set, for example, between 400°C and 550°C.

[0039] Limited by existing heating technology, heating modules typically require 30 minutes or even longer to reach the required temperature. During tungsten filament drawing, the tungsten filament needs to pass through the heating module, and this threading operation usually needs to be done manually. This means the heating module can only be activated after threading is complete, severely impacting overall production efficiency. To improve efficiency, in one embodiment of the present invention, such as... Figure 4As shown, the heating module 103 includes a heating part 131 and a moving part 132. The heating part 131 can move along the moving part 132 in a direction perpendicular to the direction of the tungsten wire. This structure allows the heating part to preheat simultaneously during the tungsten wire threading process, thereby saving time, improving efficiency, and effectively enhancing safety during threading operations. Specifically, as... Figure 4 As shown, the heating section 131 includes an upper half and a lower half that are parallel or substantially parallel to each other. A heating device, such as a heating rod, is disposed inside or on the surface of the upper half and / or the lower half. The tungsten filament passes through the gap between the upper and lower halves, and can be heated by the heating device in the upper and / or lower halves. In one embodiment of the invention, the first sidewalls of the upper and lower halves are connected to each other, such that the cross-section of the heating section 131 in the direction of the tungsten filament is "U"-shaped. The moving part 132 is used to allow the heating section 131 to translate in a direction perpendicular to the direction of the tungsten filament. In one embodiment of the present invention, the moving part 132 includes a guide rail, a slider, a ball screw, and a drive motor. The guide rail is positioned above or below the tungsten wire and is perpendicular or substantially perpendicular to the tungsten wire. The slider is correspondingly positioned on the upper or lower half of the surface of the heating part 131. One end of the ball screw is connected to the drive motor, and the other end is connected to the heating part 131. The drive motor drives the ball screw to rotate, thereby causing the heating part 131 to translate along the guide rail. It should be understood that in other embodiments of the present invention, other translation mechanisms can also be used to move the heating part, such as belt drive, chain drive, or manual operation.

[0040] During the heating of the tungsten filament, since indirect heating is used, the distance between the tungsten filament and the heating module should be as small as possible to improve the accuracy of temperature control. However, if the distance is too small, the tungsten filament may come into contact with the heating module, resulting in damage. To solve this problem, in one embodiment of the present invention, such as... Figure 5 As shown, the heating module heats the tungsten filament using a U-shaped or W-shaped heating tube 501. To prevent the heating tube 501 from undulating and touching the tungsten filament during heating, both ends of the U-shaped or W-shaped heating tube are compacted with thermal insulation material 502. The U-shaped or W-shaped heating tube has high thermal efficiency and uniform heating, meeting the temperature uniformity requirements for tungsten filament drawing. To ensure temperature uniformity, the thermal insulation material should not excessively cover the heating tube. In one embodiment of the invention, the distance the heating tube is covered by the thermal insulation material does not exceed 1 / 2 of the bend length of the U-shaped or W-shaped heating tube, preferably 1 / 4. In another embodiment of the invention, the distance the heating tube is covered by the thermal insulation material is between 1.5cm and 2.5cm, preferably 2cm.

[0041] In another embodiment of the present invention, the heating module uses a prefabricated heating block to heat the tungsten filament, and the prefabricated heating block has good temperature uniformity. For example... Figure 6 As shown, the prefabricated heating block includes a heating wire 601 and an insulating thermally conductive layer 602 covering the heating wire. After the prefabricated heating block is powered on, the heating wire begins to generate heat, directly heating the insulating thermally conductive layer through contact, and finally heating the tungsten wire through thermal radiation. In one embodiment of the present invention, the insulating thermally conductive layer is made of silicon dioxide. In one embodiment of the present invention, the prefabricated heating block is manufactured according to the following steps:

[0042] First, the heating wire is embedded in silica powder, but the wiring terminals are exposed; and

[0043] Next, the silica powder with embedded heating wires is heated at high temperature, causing the powder particles to sinter together and form a whole prefabricated heating block.

[0044] The mold module 104 is used to compress and sizing the tungsten wire to obtain a tungsten wire of a specified diameter. In one embodiment of the present invention, the mold module 104 includes a drawing die and a mold base. The mold base is disposed below the drawing die and includes a heating mechanism, which can heat the drawing die to a temperature close to or equal to the temperature of the tungsten wire heated by the heating module 103. In one embodiment of the present invention, the heating temperature of the mold base is between 200°C and 700°C.

[0045] Figure 9 A schematic diagram of the structure of a wire drawing die according to an embodiment of the present invention is shown. Figure 9 As shown, in one embodiment of the present invention, the wire drawing die includes a bushing 141 and a core 142. The bushing 141 is arranged around the core 142. The core 142 is a polycrystalline diamond core, containing 90%-98% diamond. The diamond in the polycrystalline diamond core includes nanodiamond grains and microdiamond grains, wherein the nanodiamond grains have a diameter of less than or equal to 50 nanometers, the microdiamond grains have a diameter of less than or equal to 10 micrometers, and the mass percentage of the microdiamond grains is less than or equal to 46%. The bushing 141 can be a metallic material, such as cast iron, stainless steel, or copper. Both the bushing 141 and the core 142 have a machining hole at their center. During the tungsten wire drawing process, the tungsten wire is compressed and stretched to the required diameter through the machining hole.

[0046] like Figure 9As shown, the machining hole includes a compression zone 143, a sizing zone 144, and an outlet zone 145. The compression zone 143, sizing zone 144, and outlet zone 145 are arranged sequentially in the direction from the inlet to the outlet of the machining hole. The diameter of the compression zone 143 gradually decreases in the direction from the inlet to the outlet of the machining hole, while the diameter of the outlet zone 145 gradually increases in the same direction. The cone angle θ formed by the diameter changes of the compression zone 143 and / or the outlet zone 145 is less than or equal to 18°, and the length of the sizing zone is less than or equal to 0.3 mm.

[0047] The roller module 105 is positioned behind the die module 104 along the tungsten wire's direction of travel. The sliding friction between the roller module and the tungsten wire provides traction. After being drawn by the die, the tungsten wire wraps around the roller module at least half a turn before being pulled back to the graphite emulsion module for the next drawing operation. The roller module 105 includes multiple layers of guide rollers, the number of which corresponds to the number of drawing operations, i.e., the number of drawing dies in the die module 104. During the tungsten wire drawing process, as the tungsten wire diameter decreases, the required traction force also decreases. Simultaneously, as the wire diameter decreases, the tungsten wire length increases. Therefore, in one embodiment of the invention, the diameter of each layer of guide rollers gradually increases. In one embodiment of the invention, the diameter of each layer of guide rollers is related to the elongation δ of the tungsten wire. 模具 Relatedly, the elongation δ of the tungsten wire 模具 =(d n-1 2-d n 2) / d n 2 , where d n-1 Let d be the diameter of the tungsten wire before entering the nth drawing die. n The diameter of the tungsten wire after being drawn through the nth drawing die. In one embodiment of the present invention, the elongation δ of the tungsten wire is... 模具 With the elongation δ of the tower wheel 塔轮 Approximately, but slightly greater than, the elongation δ of the tower wheel. 塔轮 That is, the ratio δ of the two 模具 δ 塔轮 ≥1.01, wherein the elongation δ of the tower wheel 塔轮 =(D n -D n-1 ) / D n-1 , where D nThe diameter up to the nth layer of guide wheels. In one embodiment of the invention, the tower wheel module 105 is driven by a motor, and the rotational speed of the tower wheel module can be controlled by a controller connected to the motor. In one embodiment of the invention, the tower wheel module is a whole and controlled by a single motor, i.e., each layer of guide wheels rotates synchronously. In yet another embodiment of the invention, different motors control each layer of guide wheels of the tower wheel module, thereby controlling the rotational speed of different guide wheels according to the required elongation. To improve the wear resistance of the tower wheel module and avoid wear or even contamination of the tungsten wire due to friction between the tungsten wire and the surface of the tower wheel module during traction, in one embodiment of the invention, the tower wheel module is made of materials such as cast iron or stainless steel, and a layer of hard alloy or ceramic is laminated on its surface, wherein the hard alloy can be, for example, tungsten carbide. Furthermore, in one embodiment of the invention, to provide the optimal coefficient of friction, the surface of the tower wheel module is further polished with 600 to 1200 grit to limit its surface roughness.

[0048] As mentioned earlier, the tower wheel module can adjust the traction force according to the required tungsten wire diameter, thereby ensuring that the tungsten wire reaches the preset elongation rate. In the multi-axis control scheme, the traction force is adjusted by the rotation speed. However, in the integrated control scheme, since the tower wheel module is a whole and the speed of each layer of guide wheels is consistent, if the traction force is controlled only by the guide wheel diameter, different tower wheel modules may be required if the required tungsten wire diameter changes, greatly reducing the versatility of the tower wheel module. To avoid this situation, in actual operation, the traction force can be adjusted by controlling the number of turns of the tungsten wire around the tower wheel module. To further control the adjustment accuracy, in one embodiment of the present invention, such as... Figure 2 As shown, a branching guide roller 108 can also be installed in front of the tower wheel module. The tungsten wire, after being extruded by the drawing die, sequentially winds around the branching guide roller and the tower wheel module. This allows for adjustment of the contact length between the tungsten wire and the tower wheel module in half-turn increments, thereby adjusting the traction force. The number of branching guide rollers is the same as the number of layers in the tower wheel module, or one fewer layer.

[0049] The guide wheel assembly 107 includes a plurality of guide wheels. In one embodiment of the present invention, the guide wheel includes a bearing and a housing, wherein the housing is connected through the bearing and can rotate under the drive of the bearing. To prevent the tungsten wire from wobbling during the tungsten wire drawing process, thereby affecting the straightness of the tungsten wire, in one embodiment of the present invention, the housing includes a "V"-shaped wire guide groove. Figure 7As shown, the bottom of the wire guide groove includes an arc segment, and the width of the arc segment is slightly larger than the diameter of the tungsten wire, for example, it can be in the range of 110% to 130% of the diameter of the tungsten wire. The conical surfaces on both sides can effectively prevent the tungsten wire from falling off the guide wheel. To avoid damage to the guide wheel from friction between the tungsten wire and the guide wheel during the wire drawing process, in one embodiment of the present invention, the outer shell of the guide wheel is made of high-molecular polyester material. In addition, to improve stability, in one embodiment of the present invention, the guide wheel includes at least two bearings, wherein the at least two bearings are concentrically arranged.

[0050] Based on the structure of the high-strength fine tungsten wire drawing equipment described above, fine drawing of tungsten wire can be achieved. Typically, fine drawing of tungsten wire can increase the wire diameter from 0.39 mm to approximately 35 micrometers. The entire fine drawing process usually requires passing through 25 to 35 dies. Therefore, if the high-strength fine tungsten wire drawing equipment described above is used, multiple operations are required to complete the fine drawing. Each operation includes:

[0051] First, the heating temperature of the heating module 103 is set according to the current tungsten wire diameter, and preheating is performed;

[0052] Next, the wire threading operation is performed, causing the tungsten wire to pass sequentially through the wire feeding module 101, graphite emulsion module 102, heating module 103, die module 104, and pulley module 105. The tungsten wire first passes through the first drawing die, wraps around the pulley module a specified number of times, and then wraps back to the graphite emulsion module 102. This process continues until the wire wraps around the pulley module a specified number of times, after which it is pulled out of the tungsten wire drawing device by the take-up module 106. To prevent the tungsten wire from swaying, a guide wheel assembly 107 is provided between the wire feeding module 101 and the graphite emulsion module 102, and / or between the die module 104 and the pulley module 105. To improve the stress adjustment progress, a wire-separating guide wheel 108 can also be provided before the pulley module 105. Furthermore, if a movable heating module is used, the wire threading operation can be completed while the heating module is preheating.

[0053] Next, the equipment is started, causing the tungsten wire to begin traveling along a preset path. First, it enters the graphite emulsion module 102, where graphite emulsion is evenly coated on its surface. Then, it is heated in the heating module 103, which both dries the moisture in the graphite emulsion and raises the tungsten wire to the required drawing temperature. Once the wire reaches the designated temperature, it is drawn through a drawing die, passes through the roller module, and returns to the graphite emulsion module to continue the next drawing cycle.

[0054] Finally, after completing one operation, replace the mold module, reset the heating module temperature, and continue the operation until the preset tungsten wire diameter is reached.

[0055] Although various embodiments of the invention have been described above, it should be understood that they are presented by way of example only and not as limitations. It will be apparent to those skilled in the art that various combinations, modifications, and alterations can be made without departing from the spirit and scope of the invention. Therefore, the breadth and scope of the invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should be defined solely by the appended claims and their equivalents.

Claims

1. A high-strength fine tungsten wire drawing device, characterized in that, include: A multi-bearing guide wheel includes at least two concentrically arranged bearings and a housing that extends through and connects to the bearings. The housing is provided with a wire guide groove to guide the direction of the metal wire to be guided. The wire guide groove is a "V" shaped wire guide groove, and its bottom includes an arc segment. The width of the arc segment is 110% to 130% of the diameter of the metal wire to be guided. as well as A heating module includes a prefabricated heating block, wherein the prefabricated heating block is a block structure and is configured to heat the tungsten wire during the tungsten wire drawing process. The prefabricated heating block includes: a plurality of dispersed heating wires and an insulating and thermally conductive layer, wherein the insulating and thermally conductive layer covers the outside of the heating wires and is made of silicon dioxide. The prefabricated heating block is manufactured according to the following steps: the heating wires are embedded in silicon dioxide powder, but the wiring terminals are exposed, and the silicon dioxide powder with the embedded heating wires is heated at high temperature, so that the powder particles sinter together to form the prefabricated heating block.

2. The high-strength fine tungsten wire drawing equipment as described in claim 1, characterized in that, The outer shell is made of high molecular weight polyester material.

3. The high-strength fine tungsten wire drawing equipment as described in claim 1, characterized in that, It also includes a wire feeding module, a graphite emulsion module, a mold module, a roller module, and a take-up module, wherein a multi-bearing guide wheel is disposed between the wire feeding module and the graphite emulsion module, and between the mold module and the roller module.

4. The high-strength fine tungsten wire drawing equipment as described in claim 3, characterized in that, The number of multi-bearing guide wheels between the wire feeding module and the graphite emulsion module, and between the mold module and the tower wheel module, is equal to the number of wire drawing dies in the mold module.

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