Manufacturing method of high-strength molybdenum wire

Abstract

The invention discloses a manufacturing method of a high-strength molybdenum wire, and belongs to the technical field of molybdenum wire manufacturing, lanthanum oxide rare earth powder and molybdenum powder are mixed, cold isostatic pressing is adopted to press and mold the powder, high-temperature sintering is carried out, then two pressure processing methods of high-temperature rolling and high-temperature drawing are adopted to carry out diameter reducing processing on the molybdenum wire, and the molybdenum wire is obtained. The molybdenum wire is subjected to annealing treatment in the high-temperature drawing process, and finally the commercial molybdenum wire is obtained by adopting a high-speed cold drawing process; according to the high-speed cold drawing process, the cold drawing speed can reach 400-1000 m / min, the molybdenum wire prepared through the high-speed cold drawing process has higher tensile strength, good ductility and higher production efficiency, the tensile strength reaches 2900 MPa or above, and the ductility is larger than 2%; the molybdenum wire produced through the preparation method has high structure uniformity, abrasion to a mold is relatively small, the wiredrawing yield and the production efficiency are greatly improved, and the production cost is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of molybdenum wire manufacturing, and particularly relates to a method for manufacturing high-strength molybdenum wire. Background Art

[0002] Electrical discharge wire cutting is widely used in the machining industry because of its simple electrode tool, small machining allowance, low cost, and simple operation. Molybdenum and its alloys have a high melting point, good thermal and electrical conductivity, low thermal expansion coefficient, and stable chemical properties. The molybdenum wire prepared by processing is an ideal choice for wire cutting electrode wire. As a key material in electrical discharge machining, the performance of wire cutting molybdenum wire directly affects the machining efficiency and accuracy. However, traditional molybdenum wire still has certain limitations in terms of strength and elongation, and it is difficult to meet the machining requirements of high precision and high efficiency. In order to improve the service life and cutting efficiency of molybdenum wire, researchers have conducted corresponding research on the composition and processing method of molybdenum wire; Patent 200610043762.5 discloses a special wire cutting electrode molybdenum wire and its manufacturing method. Lanthanum nitrate aqueous solution is added to molybdenum oxide, and molybdenum powder containing La2O3 is obtained through hydrogen reduction. The molybdenum wire processed from molybdenum powder containing La2O3 has improved tensile strength and wear resistance; Patent 201610790276.3 discloses a production method of wire cutting molybdenum wire. By adding solid solution metal elements and rare earth oxides to molybdenum, the tensile strength of molybdenum wire is increased. The tensile strength of the molybdenum wire produced by this method generally reaches 1900 - 2300 MPa. Patent 201511027765.5 discloses a composite molybdenum wire for wire cutting and its manufacturing method. By adding solid solution metal elements and reducing the content of rare earth oxidation, the purpose of improving the tensile strength and wear resistance of molybdenum wire is achieved.

[0003] High-speed cold drawing, as an important technological process in molybdenum wire processing, can significantly improve production efficiency, reduce manufacturing costs, optimize the microstructure of molybdenum wire, and enhance the mechanical properties of molybdenum wire. However, the existing molybdenum wire cold drawing process usually has a low speed (not exceeding 300 m / min), and there are problems such as poor diameter uniformity and insufficiently dense structure. Patent 202210817779.0 discloses a method for high-speed cold drawing of wire-cut molybdenum wire, which improves the lubrication method during the cold drawing of molybdenum wire. By adding the coating and drying steps of graphite emulsion lubricant, a wire drawing process with a speed of 260 - 400 m / min is obtained. Tensile strength is one of the important parameters affecting the performance of wire-cut molybdenum wire, which is directly related to cutting quality, efficiency, tool life, and cost control. Improving the tensile strength of wire-cut molybdenum wire not only helps to improve cutting accuracy, processing efficiency, tool life, and material utilization rate, but also can meet the processing requirements of high-difficulty workpieces. However, in the preparation of molybdenum wire reinforced with high-strength rare earth oxides using the cold drawing process, it is easy to cause cracks in the molybdenum wire, and the relatively high die wear also results in low surface quality and poor uniformity of the processing dimensions of the molybdenum wire, making it difficult to achieve efficient production. Summary of the Invention

[0004] The purpose of the implementation of this application is to provide a manufacturing method for high-strength molybdenum wire to solve the technical problems of low cold drawing speed, low tensile strength, poor elongation, and low production efficiency existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted in this application is: to provide a manufacturing method for high-strength molybdenum wire, which specifically includes the following steps:

[0006] (I). Compression molding: Mix molybdenum powder with lanthanum oxide rare earth powder to obtain a mixed powder, and press the mixed powder to obtain a blank bar.

[0007] (II). Sintering: Sinter the blank bar under gas protection to obtain a sintered molybdenum rod.

[0008] (III). Rolling: Perform hot rolling on the sintered molybdenum rod to obtain a molybdenum wire rod.

[0009] (IV). Drawing: Gradually draw the molybdenum wire rod into molybdenum wire through multiple passes of hot drawing; perform annealing during the drawing process to ensure the uniformity of the internal structure of the molybdenum wire.

[0010] (V). High-speed cold drawing: Perform multiple passes of room-temperature drawing on the molybdenum wire through a non-slip wire drawing machine. During the drawing process, use anti-wear hydraulic oil as a lubricant and coolant to obtain the finished molybdenum wire. The cold drawing speed is 400 - 1000 m / min, and the single-pass deformation amount is 10 - 18%. Preferably, the drawing speed is 500 - 700 m / min.

[0011] In one of the embodiments,

[0012] Step (1): The mass ratio of molybdenum powder to rare earth lanthanum oxide powder is 1:0.005 - 0.01; the average particle size of molybdenum powder is 2 - 5 μm, and the average particle size of rare earth lanthanum oxide powder is 0.2 - 1 μm.

[0013] In one embodiment,

[0014] The pressing condition in step (1) is cold isostatic pressing, the pressing force of cold isostatic pressing is 140 - 200 MPa, and the pressure holding time is 1 - 3 min.

[0015] In one embodiment,

[0016] The sintering temperature in step (2) is 2050 - 2150 °C, the sintering time is 8 - 12 h; the gas is hydrogen; the diameter of the sintered molybdenum rod is 50 - 55 mm.

[0017] In one embodiment,

[0018] The temperature of hot rolling in step (3) is 1350 - 1450 °C, the rolling speed is 5 - 10 m / min, the number of rolling passes is not less than 20 passes, preferably 20 - 30 passes; the diameter of the molybdenum wire rod is 5.5 - 6.5 mm.

[0019] In one embodiment,

[0020] In step (4), the temperature of hot drawing decreases gradually as the diameter of the molybdenum wire decreases, the drawing temperature decreases from 1100 °C to 600 °C, and the single-pass deformation amount is controlled between 17 - 34%; a graphite emulsion solution is used as a lubricant during the drawing process.

[0021] In one embodiment,

[0022] The annealing temperature in step (4) is 800 - 1300 °C, the annealing speed is 1 - 12 m / min; the diameter of the molybdenum wire is 0.5 - 1.2 mm.

[0023] In one embodiment,

[0024] The number of drawing passes in step (5) of high-speed cold drawing is not less than 10 passes, preferably 10 - 15 passes; the processing deformation amount of the last two passes is 10 - 13%.

[0025] In one embodiment,

[0026] During the high-speed cold drawing in step (5), a tension force F is applied to the molybdenum wire f, the magnitude of the tension force gradually decreases as the diameter of the drawn molybdenum wire decreases, and the magnitude of the tension force is 5 - 60 N; the magnitude of the tension force is applied to the drawn molybdenum wire through a tension device composed of a servo torque motor; high-speed drawing is achieved by a servo motor driving a wire take-up device, and the power of the servo motor is greater than formula (1)

[0027] P = F z V max formula (1)

[0028] wherein, P is the power required for drawing, F z is the total drawing force, v max is the maximum drawing speed;

[0029] The force required for drawing satisfies formula (2)

[0030]

[0031] wherein, S1 is the cross-sectional area of the molybdenum wire after drawing, S0 is the cross-sectional area of the molybdenum wire before drawing, σ f is the flow stress of the molybdenum wire, is the equivalent deformation degree of the molybdenum wire passing through the die, μ is the friction coefficient, and α is the inclination angle of the die drawing hole;

[0032] In one embodiment,

[0033] The diameter of the finished molybdenum wire in step (five) is 0.18 mm.

[0034] The present application provides a method for manufacturing a high-strength molybdenum wire, which further increases the drawing speed of the molybdenum wire to 400 - 1000 m / min, improves the thermal activation effect during the drawing process of the molybdenum wire, and thus improves the processing plasticity of the molybdenum wire during high-speed drawing; in addition, during high-speed cold drawing, a tension force is applied to the molybdenum wire, and this tension force will cause a change in the inlet profile, which is beneficial to reducing the radial pressure, reducing the frictional shear stress during high-speed cold drawing, improving the lubrication effect of the lubricant, reducing the wear of the die, and improving the diameter uniformity and surface quality of the molybdenum wire; through the optimization of the processing technology of the molybdenum wire, the molybdenum wire prepared by the present application has a tensile strength of up to more than 2900 MPa and an elongation rate greater than 2%, far exceeding traditional molybdenum wires; adopting the high-speed cold drawing process, the drawing speed can reach 400 - 1000 m / min, significantly improving the production efficiency; through reasonable process design, the production cost is reduced, and it has high market competitiveness. Brief Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a schematic diagram of the manufacturing process of molybdenum wire;

[0037] Figure 2 It is a schematic diagram of the contour change at the die entrance after applying a tension force during the cold drawing process of molybdenum wire;

[0038] Figure 3 It is a cross-sectional metallographic structure diagram of molybdenum wire;

[0039] Figure 4 It is a cross-sectional scanning electron microscope diagram of molybdenum wire;

[0040] Figure 5 It is a surface topography diagram of molybdenum wire. Specific embodiments

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understandable, the present application will be further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] Embodiment 1

[0043] A manufacturing method of high-strength molybdenum wire, as Figure 1 shown, specifically includes the following steps:

[0044] (1). Compression molding: Mix molybdenum powder with an average particle size of 3 μm and lanthanum oxide rare earth powder with a particle size of 0.5 μm. The mass ratio of molybdenum powder to lanthanum oxide rare earth powder is 1:0.007. Mix for 10 h to obtain a mixed powder. Perform cold isostatic pressing on the mixed powder with a pressing force of 160 MPa and hold the pressure for 2 min to obtain a blank bar;

[0045] (2). Sintering: Perform hydrogen protection sintering on the blank bar at 2100 °C for 8 h to obtain a sintered molybdenum rod with a diameter of 55 mm;

[0046] (3). Rolling: Use a rolling mill to perform hot rolling on the sintered molybdenum rod under the conditions of a rolling temperature of 1398 °C and a rolling speed of 8 m / min to obtain a molybdenum wire rod with a diameter of 6 mm; The number of rolling passes is 24 passes;

[0047] (4). Drawing: The molybdenum wire rod is drawn through multiple high-temperature drawing passes, with the deformation per pass controlled between 17% and 34%. It is gradually drawn into a molybdenum wire with a diameter of 0.39 mm. The drawing temperature gradually decreases as the diameter of the molybdenum wire decreases, from 1100 °C to 600 °C. During the drawing process, the molybdenum wire with a diameter of 1 mm is annealed at an annealing temperature of 950 °C and an annealing speed of 2 m / min. A graphite emulsion solution is used as a lubricant during the drawing process;

[0048] (5). High-speed cold drawing: The molybdenum wire with a diameter of 0.39 mm is drawn through a multi-pass room-temperature drawing on a non-slip wire drawing machine at room temperature. An anti-wear hydraulic oil is used as a lubricant and coolant during the drawing process. The drawing speed is 500 m / min, and the number of drawing passes is 10. The drawing deformation of the last two passes is controlled at about 13%, and the drawing deformation of other passes is between 15% and 18%. The applied tension gradually decreases from 60 N to 10 N as the number of drawing passes increases, and a finished molybdenum wire with a diameter of 0.18 mm is obtained;

[0049] In the high-speed cold drawing in step (5) during the drawing process, as Figure 2 shown, a tension F is applied to the molybdenum wire f . The magnitude of the tension gradually decreases as the diameter of the drawn molybdenum wire decreases, and the magnitude of the tension is 10 - 60 N. The magnitude of the tension is applied to the drawn molybdenum wire through a tensioning device composed of a servo torque motor. The high-speed drawing is realized by a servo motor driving a wire take-up device. The realization of this process does not depend on a specific device, and existing devices are relatively mature, so they will not be elaborated here. The power of the servo motor is greater than formula (1)

[0050] P = F z V max Formula (1)

[0051] where P is the power required for drawing, F z is the total drawing force, and v max is the maximum drawing speed;

[0052] The force required for drawing satisfies formula (2)

[0053]

[0054] where S1 is the cross-sectional area of the molybdenum wire after drawing, S0 is the cross-sectional area of the molybdenum wire before drawing, σ f is the flow stress of the molybdenum wire, is the equivalent deformation degree of the molybdenum wire passing through the die, μ is the friction coefficient, and α is the inclination angle of the die drawing hole;

[0055] (6). The tensile strength and elongation rate of the finished molybdenum wire are tested, and three parallel tests are carried out. The results are shown in Table 1 and Figures 3 - 5 .

[0056] Example 2

[0057] The difference between this example and Example 1 lies in step (v). Specifically: A molybdenum wire with a diameter of 0.39 mm is subjected to multi-pass room-temperature drawing through a non-slip wire drawing machine at room temperature. During the drawing process, anti-wear hydraulic oil is used as a lubricant and coolant. The drawing speed is 600 m / min. The drawing deformation amount of the last two passes is controlled at about 12%, and the drawing deformation amount of other passes is between 14% and 17%. The applied tension gradually decreases from 50 N to 10 N as the drawing pass increases. The rest of the operations are the same, and a finished molybdenum wire is obtained; the tensile strength and elongation rate of the finished molybdenum wire are tested, and the results are shown in Table 1.

[0058] Example 3

[0059] The difference between this example and Example 1 lies in step (v). Specifically: A molybdenum wire with a diameter of 0.39 mm is subjected to multi-pass room-temperature drawing through a non-slip wire drawing machine at room temperature. During the drawing process, anti-wear hydraulic oil is used as a lubricant and coolant. The drawing speed is 700 m / min. The drawing deformation amount of the last two passes is controlled at about 11%, and the drawing deformation amount of other passes is between 14% and 17%. The applied tension gradually decreases from 45 N to 5 N as the drawing pass increases. The rest of the operations are the same, and a finished molybdenum wire is obtained; the tensile strength and elongation rate of the finished molybdenum wire are tested, and the results are shown in Table 1.

[0060] Example 4

[0061] The difference between this example and Example 1 lies in step (v). Specifically: A molybdenum wire with a diameter of 0.39 mm is subjected to multi-pass room-temperature drawing through a non-slip wire drawing machine at room temperature. During the drawing process, anti-wear hydraulic oil is used as a lubricant and coolant. The drawing speed is 400 m / min, and the number of drawing passes is 15. The drawing deformation amount of the last two passes is controlled at about 13%, and the drawing deformation amount of other passes is between 15% and 18%. The applied tension gradually decreases from 60 N to 10 N as the drawing pass increases. The rest of the operations are the same, and a finished molybdenum wire is obtained.

[0062] Example 5

[0063] The difference between this example and Example 1 lies in step (v). Specifically: A molybdenum wire with a diameter of 0.39 mm is subjected to multi-pass room-temperature drawing through a non-slip wire drawing machine at room temperature. During the drawing process, anti-wear hydraulic oil is used as a lubricant and coolant. The drawing speed is 1000 m / min. The drawing deformation amount of the last two passes is controlled at about 10%, and the drawing deformation amount of other passes is between 10% and 14%. The applied tension gradually decreases from 45 N to 5 N as the drawing pass increases. The rest of the operations are the same, and a finished molybdenum wire is obtained.

[0064] Example 6

[0065] The difference between this embodiment and Embodiment 1 is that the mass ratio of molybdenum powder to rare earth lanthanum oxide powder is 1:0.005; the average particle size of molybdenum powder is 2 μm, and the average particle size of rare earth lanthanum oxide powder is 0.2 μm, and the remaining operations are the same.

[0066] Embodiment 7

[0067] The difference between this embodiment and Embodiment 1 is that the mass ratio of molybdenum powder to rare earth lanthanum oxide powder is 1:0.01; the average particle size of molybdenum powder is 5 μm, and the average particle size of rare earth lanthanum oxide powder is 1 μm, and the remaining operations are the same.

[0068] Embodiment 8

[0069] The difference between this embodiment and Embodiment 1 is that in step (i), the cold isostatic pressing force is 140 MPa and the pressure holding time is 3 min, and the remaining operations are the same.

[0070] Embodiment 9

[0071] The difference between this embodiment and Embodiment 1 is that in step (i), the cold isostatic pressing force is 200 MPa and the pressure holding time is 1 min, and the remaining operations are the same.

[0072] Embodiment 10

[0073] The difference between this embodiment and Embodiment 1 is that in step (ii), the sintering temperature is 2050 °C, the sintering time is 12 h, and the diameter of the sintered molybdenum rod is 50 mm, and the remaining operations are the same.

[0074] Embodiment 11

[0075] The difference between this embodiment and Embodiment 1 is that in step (ii), the sintering temperature is 2150 °C and the sintering time is 10 h, and the remaining operations are the same.

[0076] Embodiment 12

[0077] The difference between this embodiment and Embodiment 1 is that in step (iii), the high-temperature rolling temperature is 1350 °C, the rolling speed is 5 m / min, the number of rolling passes is 20 passes, and the diameter of the molybdenum wire rod is 6.5 mm, and the remaining operations are the same.

[0078] Embodiment 13

[0079] The difference between this embodiment and Embodiment 1 is that in step (iii), the high-temperature rolling temperature is 1450 °C, the rolling speed is 10 m / min, the number of rolling passes is 30 passes, and the diameter of the molybdenum wire rod is 5.5 mm, and the remaining operations are the same.

[0080] Embodiment 14

[0081] The difference between this embodiment and Embodiment 1 is that in step (iv), the annealing temperature is 800 °C and the annealing speed is 12 m / min; the diameter of the molybdenum wire is 0.5 mm, and the rest of the operations are the same.

[0082] Embodiment 15

[0083] The difference between this embodiment and Embodiment 1 is that in step (iv), the annealing temperature is 1100 °C and the annealing speed is 1 m / min; the diameter of the molybdenum wire is 1.2 mm, and the rest of the operations are the same.

[0084] Embodiment 16

[0085] The difference between this embodiment and Embodiment 1 is that in step (iv), the annealing temperature is 1300 °C and the annealing speed is 6 m / min; the diameter of the molybdenum wire is 0.9 mm, and the rest of the operations are the same.

[0086] Table 1 Tensile strength and elongation tests of Embodiments 1 - 3

[0087]

[0088] The molybdenum wires in Embodiments 1 - 3 were tested for tensile strength using a tensile testing machine. As can be seen from Table 1, the tensile strength of the molybdenum wires prepared in this application is higher than 2900 MPa, and the elongation is greater than 2%. As Figure 3 shown, no cracks occurred in the molybdenum wires; as Figure 4 shown, the internal structure of the molybdenum wires was dense and uniform, and no obvious defects were found; as Figure 5 shown, the surface morphology of the molybdenum wires at the position of 50,000 meters of single-hole drawing. The surface of the molybdenum wires was relatively uniform, and no obvious deep gullies existed, indicating that the molybdenum wires had high uniformity. The optimized process had relatively little wear on the die, greatly improving the wire drawing yield and production efficiency, and reducing the production cost.

[0089] The present application provides a method for manufacturing high-strength molybdenum wire, including pressing and forming, sintering, rolling, drawing, annealing, and high-speed cold drawing. Generally, as the drawing rate increases, the movement of dislocations is inhibited, resulting in an enhanced work-hardening effect. At the same time, at a high strain rate, the deformation heat accumulates quickly, and the local temperature rise will cause material softening, partially offsetting the work-hardening effect. The existing cold-drawing process of molybdenum wire usually has a relatively low speed, generally not exceeding 300 m / min. The present application further increases the drawing speed of molybdenum wire to 400 - 1000 m / min, enhances the thermal activation effect during the drawing process of molybdenum wire, and thus improves the processing plasticity of molybdenum wire during high-speed drawing. In addition, during high-speed cold drawing, a tension force is applied to the molybdenum wire. This tension force will cause a change in the entrance profile, which is beneficial to reducing the radial pressure, decreasing the frictional shear stress during high-speed cold drawing, improving the lubrication effect of the lubricant, reducing the wear of the die, and improving the diameter uniformity and surface quality of the molybdenum wire. By optimizing the processing technology of molybdenum wire, the molybdenum wire prepared in the present application has a tensile strength of up to over 2900 MPa and an elongation greater than 2%, far exceeding traditional molybdenum wire. Using the high-speed cold-drawing process, the drawing speed can reach 400 - 1000 m / min, significantly improving the production efficiency. Through reasonable process design, the production cost is reduced, and it has high market competitiveness.

[0090] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0091] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for manufacturing high-strength molybdenum wire, characterized in that: The specific steps include: (i) Pressing and molding: mixing molybdenum powder and lanthanum oxide rare earth powder to obtain mixed powder, and pressing the mixed powder to obtain billets; (ii) Sintering: sintering the billet under gas protection to obtain a sintered molybdenum rod; (iii) rolling: subjecting the sintered molybdenum rod to high temperature rolling to obtain a molybdenum wire rod; (iv) Drawing: drawing the molybdenum wire rod through multiple high-temperature drawing steps to gradually draw it into molybdenum wire; annealing is performed during the drawing process; (V) High-speed cold drawing: The molybdenum wire is drawn through a non-slip wire drawing machine for multiple passes at room temperature. Anti-wear hydraulic oil is used as a lubricant and coolant during the drawing process to obtain the finished molybdenum wire. The cold drawing speed is 400-1000m / min, and the deformation of a single pass is 10-18%.

2. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: The mass ratio of the molybdenum powder to the lanthanum oxide rare earth powder in step (a) is 1:0.005-0.01; the average particle size of the molybdenum powder is 2-5 μm, and the average particle size of the lanthanum oxide rare earth powder is 0.2-1 μm.

3. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: The pressing conditions of step (a) are cold isostatic pressing, the pressing force of cold isostatic pressing is 140-200 MPa, and the holding time is 1-3 min.

4. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: In step (ii), the sintering temperature is 2050-2150° C., and the sintering time is 8-12 hours; the gas is hydrogen; and the diameter of the sintered molybdenum rod is 50-55 mm.

5. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: In step (iii), the high temperature rolling temperature is 1350-1450°C, the rolling speed is 5-10m / min, and the rolling passes are 20-30 times; the diameter of the molybdenum wire rod is 5.5-6.5mm.

6. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: The temperature of the high-temperature drawing in step (iv) gradually decreases as the diameter of the molybdenum wire decreases, the drawing temperature is reduced from 1100° C. to 600° C., and the deformation of a single pass is controlled between 17% and 34%. Graphite emulsion solution is used as a lubricant during the drawing process.

7. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: The annealing temperature in step (iv) is 800-1300° C., and the annealing speed is 1-12 m / min; the diameter of the molybdenum wire is 0.35-0.5 mm.

8. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: The high-speed cold drawing in step (v) is performed 10-15 times, and the processing deformation in the last two times is 10-13%.

9. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: Step (5) During the high-speed cold drawing process, a tensioning force F is applied to the molybdenum wire. f The tension gradually decreases as the diameter of the drawn molybdenum wire decreases, and the tension is 5-60N. The tension is applied to the drawn molybdenum wire through a tensioning device composed of a servo torque motor. High-speed drawing is achieved by driving the wire take-up device with a servo motor, and the power of the servo motor is greater than formula (1) P=F z V max Formula (1) Where P is the power required for drawing, F z is the total pull-out force, v max is the maximum drawing speed; The force required for pulling out satisfies formula (2) Among them, S1 is the cross-sectional area of ​​the molybdenum wire after drawing, S0 is the cross-sectional area of ​​the molybdenum wire before drawing, σ f is the flow stress of molybdenum wire, is the equivalent deformation degree of the molybdenum wire passing through the die, μ is the friction coefficient, and α is the inclination angle of the die drawing hole.

10. The method for manufacturing a high-strength molybdenum wire according to claim 1, characterized in that: The diameter of the finished molybdenum wire in step (five) is 0.18 mm.

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