Multi-pass wire drawing equipment

Abstract

The utility model relates to the technical field of drawing equipment, in particular to multi-pass wire drawing equipment. The equipment comprises a drawing cone pulley mechanism and a heating furnace, the drawing cone pulley mechanism comprises a cone pulley, and the surface of the cone pulley is divided into at least Z sections of areas in the axial direction of the cone pulley; wherein the surface roughness of each section of area is different, so that the surface friction coefficient of each section of area is different; the total drawing pass is M, and when M is larger than or equal to 2, Z is larger than or equal to 2 and smaller than or equal to M, so that at least one pass of wire drawing is conducted on each area. The drawing cone pulley solves the problem that due to the fact that the number of drawing passes is increased, the sliding coefficient difference between the first pass and the last pass is too large, and wires are broken, and the drawing efficiency of a single machine is remarkably improved.

Description

[0001] This application claims the priority of a Chinese patent application titled "A Drawing Tower Pulley Mechanism, a Heating Furnace, and a Multi-pass Wire Drawing Equipment" with an application number of 2023108301082 and filed with the Chinese Patent Office on July 7, 2023. The entire content thereof is incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of wire drawing equipment, and particularly relates to a multi-pass wire drawing equipment. Background Art

[0003] High-strength tungsten alloy wires are gradually replacing carbon steel wires in fields such as diamond wire cutting, precision mechanical ropes, cut-resistant protection, and screen printing due to their comprehensive excellent properties such as higher strength (tensile strength exceeding 5500 MPa) and finer wire diameters (diameter less than 0.037 mm).

[0004] Currently, the drawing of high-strength and low-diameter metal wire materials (tungsten wires) mainly uses a sliding drawing device. However, the existing sliding drawing device has the following problems:

[0005] (1) As Figures 1-3 shown, the current sliding multi-pass drawing device uses a segmented stepped tower pulley. Multi-pass wire materials are wound around the same segmented stepped tower pulley. Due to the design requirements of the tower pulley steps and the coaxiality requirements, the number of drawing passes is generally 6 or 8, not exceeding 10. It is impossible to integrate more passes, resulting in low single-pass drawing efficiency.

[0006] (2) As Figures 4-6 shown, the current sliding drawing device uses a straight cylindrical tower pulley. Multi-pass wire materials are wound around the same straight cylindrical tower pulley. From the first pass to the last pass, the wire diameter specifications of the wire materials gradually become finer. Since the rotational speed of the straight cylindrical tower pulley is the same and the wire diameter of the wire material gradually becomes finer, the difference in slip amount between passes becomes larger; after the number of drawing passes of the straight cylindrical sliding drawing exceeds 7, due to the too large difference in sliding coefficients between the first pass and the last pass, it is extremely easy to break wires frequently; limited by the above reasons, the straight cylindrical tower pulley generally does not exceed 10 passes, and the single-pass drawing efficiency is not high. Summary of the Utility Model

[0007] To solve the problems in the prior art mentioned in the above background art, the utility model provides a multi-pass wire drawing equipment, and its technical solution is as follows:

[0008] The multi-pass wire drawing device includes a drawing capstan mechanism and a heating furnace for heating the wire at each pass; the drawing capstan mechanism includes a capstan, and the surface of the capstan is axially divided into at least Z sections; wherein, the surface roughness of each section is different, so that the surface friction coefficient of each section is different; wherein, the total number of drawing passes is M, when M is greater than or equal to 2, Z is greater than or equal to 2 and less than or equal to M, so that each area performs at least one pass of wire drawing.

[0009] In some embodiments, different coatings are applied to the surface of each section, so that the surface roughness of each section is different.

[0010] In some embodiments, the surface roughness Ra of the area is 0.05 to 0.8.

[0011] In some embodiments, the coating includes alumina coating, zirconia coating, WC coating, chromium coating, titanium carbide coating, titanium nitride coating, carbonitride coating.

[0012] In some embodiments, the drawing capstan mechanism further includes a wire drawing die holder and a first guide wheel group arranged in sequence on one side of the capstan; the wire drawing die holder includes M wire drawing dies; the first guide wheel group includes M first guide wheels arranged corresponding to the wire drawing dies one by one; wherein, the wire is guided by the first guide wheel group, passes through the die orifice of the wire drawing die, winds around the capstan and then winds back to the first guide wheel group, and so on for multi-pass drawing.

[0013] In some embodiments, the heating furnace includes a furnace body shell and a heating component arranged in the furnace chamber of the furnace body shell; the heating component includes Y independently temperature-controlled heating assemblies, Y is greater than or equal to.

[0014] In some embodiments, the heating assembly is detachably connected to the furnace body shell.

[0015] In some embodiments, each heating assembly includes a heating wire body and a temperature measuring sensor for measuring temperature; the heating wire body and the temperature measuring sensor are both connected to a control system.

[0016] In some embodiments, each heating wire body extends along the axial direction of the wire, so that Y heating wire bodies are arranged in parallel and in parallel in the furnace chamber; the heating wire body is located above and / or below the wire.

[0017] In some embodiments, a glass tube is sleeved outside the heating wire body; there is a gap between the glass tube and the heating wire body, and the gap can be used to fill gas.

[0018] In some embodiments, the inner furnace chamber of the furnace body shell is filled with a protective gas.

[0019] In some embodiments, it further includes a tension control mechanism for adjusting the wire tension; the heating furnace is arranged between the wire drawing die holder and the first guide wheel set, and the tension control mechanism is arranged on the side of the first guide wheel set away from the wire drawing die holder; wherein, after the wire passes through the tension control mechanism and the first guide wheel set in sequence, it then passes through the furnace chamber of the heating furnace and the wire drawing die of the wire drawing die holder in sequence, and is wound around the capstan structure, and multiple passes of wire drawing are carried out reciprocally in this way.

[0020] Compared with the prior art, the present utility model has the following beneficial effects:

[0021] The capstan for multi-pass wire drawing equipment of the present utility model has at least Z regions with different roughnesses on its surface, which solves the problem of excessive difference in sliding coefficients between the first and last passes caused by an increase in the number of wire drawing passes and wire breakage, and significantly improves the single-pass wire drawing efficiency. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is the front view of a multi-pass wire drawing equipment with a segmented stepped capstan in the prior art;

[0024] Figure 2 It is the top view of a multi-pass wire drawing equipment with a segmented stepped capstan in the prior art;

[0025] Figure 3 It is the three-dimensional view of a multi-pass wire drawing equipment with a segmented stepped capstan in the prior art;

[0026] Figure 4 It is the front view of a multi-pass wire drawing equipment with a straight cylindrical capstan in the prior art;

[0027] Figure 5 It is the top view of a multi-pass wire drawing equipment with a straight cylindrical capstan in the prior art;

[0028] Figure 6 It is the three-dimensional view of a multi-pass wire drawing equipment with a straight cylindrical capstan in the prior art;

[0029] Figure 7 It is the top view of a multi-pass wire drawing equipment with a single heating wire heating furnace in the prior art;

[0030] Figure 8Is a perspective view of a multi-pass drawing device with a single heating wire heating furnace;

[0031] Figure 9 Is a front view of the multi-pass drawing device provided in Example 1;

[0032] Figure 10 Is a top view of the multi-pass drawing device provided in Example 1;

[0033] Figure 11 Is a perspective view of the multi-pass drawing device provided in Example 1;

[0034] Figure 12 Is a top view of the tower pulley group and the wire drawing die holder in Example 1;

[0035] Figure 13 Is a perspective view of the tower pulley group and the wire drawing die holder in Example 1;

[0036] Figure 14 Is a top view of the heating furnace in Example 1;

[0037] Figure 15 Is a perspective view of the heating furnace in Example 1;

[0038] Figure 16 Is a perspective view of the tension control mechanism in Example 1;

[0039] Figure 17 Is a top view of the tower pulley group and the wire drawing die holder in Example 2;

[0040] Figure 18 Is a perspective view of the tower pulley group and the wire drawing die holder in Example 2;

[0041] Figure 19 Is a top view of the tower pulley group and the wire drawing die holder in Example 3;

[0042] Figure 20 Is a perspective view of the tower pulley group and the wire drawing die holder in Example 3;

[0043] Figure 21 Is a front view of the heating furnace in Example 4;

[0044] Figure 22 Is a top view of the heating furnace in Example 4;

[0045] Figure 23 Is a perspective view of the heating furnace in Example 4;

[0046] Figure 24 Is a structural schematic diagram of the heating wire assembly in Example 5;

[0047] Figure 25 Is a structural schematic diagram of the heating wire assembly in Examples 6-8;

[0048] Figure 26 The top view of the multi-pass drawing equipment for the heating wire assembly in Example 9;

[0049] Figure 27 The top view of the capstan in Example 9;

[0050] Figure 28 The top view of the capstan and the wire drawing die holder in Example 10.

[0051] Reference numerals:

[0052] 10 Capstan group, 20 Wire drawing die holder, 30 First guide wheel group, 40 Heating furnace, 50 Tension control mechanism, 60 Wire feeding mechanism, 70 Rewinding mechanism, 110 Capstan, 111 Thin rod, 112 Capstan body, 113 Region, 113a First region, 113b Second region, 113c Third region, 210 Wire drawing die, 310 First guide wheel, 410 Furnace body shell, 420 Heating component, 430 Furnace chamber, 440 Glass tube, 421 Heating wire body, 422 Temperature measuring point, 510 Tension adjusting component, 511 Supporting wheel, 512 Pressing wheel, 112a Segmented stepped capstan, 112b Straight barrel capstan, 1 First temperature zone, 2 Second temperature zone, 3 Third temperature zone, 4 Fourth temperature zone, 5 Fifth temperature zone, 6 Sixth temperature zone, 7 Seventh temperature zone, 8 Eighth temperature zone, 9 Ninth temperature zone. Detailed implementation manners

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0054] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] The present utility model provides as Figures 9-16 Example 1, Figures 17-18Example 2 Figures 19-20 Example 3, Examples 21 - 23, Example 4 Figure 24 Example 5 Figure 25 A multi - pass wire drawing device as shown in Examples 6 - 8, which includes a drawing capstan mechanism, a heating furnace 40, and a tension control mechanism 50 for adjusting the wire tension.

[0056] Regarding the drawing capstan mechanism

[0057] Design 1 of the drawing capstan mechanism:

[0058] As Figures 9-16 Example 1 Figures 17-18 Example 2 Figures 19-20 Example 3, the drawing capstan mechanism for multi - pass drawing includes a capstan group 10, a wire drawing die holder 20 and a first guide wheel group 30 arranged in sequence on one side of the capstan group 10; the capstan group 10 includes N capstans 110 arranged in parallel; the wire drawing die holder 20 includes M wire drawing dies 210; the wire is guided by the first guide wheel group 30, passes through the die orifice of the wire drawing die 210, winds around the capstan 110 and then rewinds to the first guide wheel group 30, and so on for multi - pass drawing; among them, the total number of drawing passes is M, M is greater than or equal to 2, N is greater than or equal to 2 and less than or equal to M, and each capstan 110 performs at least one pass of wire drawing.

[0059] Specifically, as Figures 9-16 shown, during the drawing process, the wire in the first pass is guided by the first guide wheel group 30, passes through the die orifice of the wire drawing die 210, winds around the capstan 110 and then rewinds to the first guide wheel group 30. After rewinding, like the first pass, the second - pass drawing starts; and so on until the last pass.

[0060] Among them, in use, the wires in multiple passes are divided into multiple groups and are drawn by multiple capstans 110 respectively. For example: in this Example 1, the total number of passes is eight, divided into two groups, with four passes in each group. The wires in the first pass to the fourth pass are drawn on the first capstan 110, and so on. The fifth pass and the eighth pass are drawn on the second capstan 110.

[0061] In summary, for the drawing capstan mechanism of the present utility model, it adopts the method of arranging multiple capstans 110 side by side to form a capstan group 10. Through the corresponding cooperation between the capstan group 10 and the wire drawing die holder 20, and the rewinding cooperation between the first guide wheel group 30 and the capstan group 10, the multi - pass wires are distributed on multiple capstans 110. Among them, since each independent capstan 110 can independently adjust the rotation speed, the problem of wire breakage caused by too large a difference in the slip coefficient between the first and last passes due to an increase in the number of drawing passes is solved, and the single - machine drawing efficiency is improved;

[0062] In addition, due to the winding matching design of the tower wheel group 10, the drawing die frame 20, and the first guide wheel group 30, multiple drawing passes are integrated together on the basis of ensuring that multiple wires are distributed on multiple tower wheels 110, effectively saving equipment space and wire production space.

[0063] It should be noted that: in this embodiment 1, two parallel arranged step pulleys 110 are provided, the total number of drawing passes and the number of wire drawing dies 210 are 8 (M=2), and the 8 wires are divided into 2 groups to be drawn through the two step pulleys 110; according to the above design concept, the number of step pulleys 110 and the number of wires drawn on each step pulley 110 can be adaptively adjusted according to the total number of drawing passes M. Moreover, it is not limited to the same number of wires in each group, for example, 8 wires can be divided into 2 groups and drawn on different step pulleys 110, one group has 3 passes and the other group has 5 passes, including but not limited to the embodiment 1 scheme, preferably, the wire drawing passes on each step pulley 110 do not exceed eight.

[0064] Preferably, if Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Embodiment 3, the front pulley 110 is provided with a giving way mechanism for the wire material wound on the rear pulley 110 to pass through, and the front pulley 110 is closer to the wire drawing die frame 20 than the rear pulley 110 .

[0065] Preferably, if Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Example 3, the giving way mechanism is a thin rod 111 ; the preceding tower wheel 110 includes the thin rod 111 and a tower wheel body 112 , so that the wire material wound on the following tower wheel 110 can pass through the space above the thin rod 111 .

[0066] like Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 As shown in Example 3, when in use, the diameter of the thin rod 111 is smaller than the diameter of the tower wheel body 112 (in Example 2-3, a segmented stepped tower wheel 112a is provided, and the diameter of the thin rod 111 is smaller than the minimum diameter of the tower wheel body 112). This design allows the wire material passing through the die opening of the wire drawing die 210 to pass through the space above the thin rod 111 and be wound around the next tower wheel 110.

[0067] It should be noted that in the present embodiments 1-3, the yielding mechanism is a thin rod 111, and the step pulley 110 is composed of the thin rod 111 and the step pulley body 112, so that the wire can pass through the gap above the thin rod 111 of the previous step pulley 110; according to the above design concept, other schemes that can achieve the above effects can also be adopted, for example, Figure 28For the staggered design solution of the cone pulley 110 shown in Embodiment 10, N of the cone pulleys 110 are staggered along their axial directions, so that the wire wound on the cone pulley 110 does not pass through the area where the adjacent cone pulley 110 is located; for another example, a groove is provided on the upper part of a partial area of the previous cone pulley 110, so that the wire wound on the subsequent cone pulley 110 can pass through the groove of the previous cone pulley 110, including but not limited to the embodiment solutions.

[0068] Preferably, as Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 Embodiment 3 shows, the first guide pulley group 30 includes M first guide pulleys 310 arranged in one-to-one correspondence with the wire drawing dies 210.

[0069] During use, one first guide pulley 310 is equipped for the wire in each pass, separating each pass, facilitating the alignment of the line in each pass and the wire passing buffer, which is convenient and practical.

[0070] Preferably, the cone pulley 110 is a straight cylindrical cone pulley 112b and / or a segmented stepped cone pulley 112a.

[0071] As Figures 9-16 Embodiment 1, Figures 17-18 Embodiment 2, Figures 19-20 Embodiment 3 shows, multiple cone pulleys 110 in the cone pulley group 10 can be any combination of the straight cylindrical cone pulley 112b and the segmented stepped cone pulley 112a.

[0072] Preferably, when the cone pulley group 10 includes the segmented stepped cone pulley 110a, a second guide pulley group (not shown in the figure) is provided between the cone pulley group 10 and the wire drawing die holder 20. Preferably, the second guide pulley group includes M second guide pulleys arranged in one-to-one correspondence with the wire drawing dies 210.

[0073] After the wire exits from the wire drawing die 210, there is a height difference in the segmented stepped cone pulley 110a in different passes. The second guide pulley is used for guiding to adapt to the height difference from the wire drawing die 210 to the segmented stepped cone pulley 110a in different passes, improving the drawing effect.

[0074] For the drawing cone pulley mechanism design two:

[0075] As Figures 26-27As shown in Embodiment 9, it includes a cone pulley 110 and a wire drawing die holder 20; the wire drawing die holder 20 includes M wire drawing dies 210; the surface of the cone pulley 110 is axially divided into at least Z section areas 113; wherein, the surface roughness of each section area 113 is different, so that the surface friction coefficient of each section area 113 is different; wherein, the total number of drawing passes is M, M is greater than or equal to 2, Z is greater than or equal to 2 and less than or equal to M; at least one pass of wire drawing is performed on each area 113.

[0076] Preferably, it further includes a first guide pulley group 30 arranged on the side of the wire drawing die holder 20 away from the cone pulley 110; the wire is guided by the first guide pulley group 30, passes through the die orifice of the wire drawing die 210, then winds around the cone pulley 110 and returns to the first guide pulley group 30, and so on for multiple passes of wire drawing.

[0077] Specifically, as Figures 26-27 shown, during the wire drawing process, the wire in the first pass is guided by the first guide pulley group 30, passes through the die orifice of the wire drawing die 210, then winds around the cone pulley 110 and returns to the first guide pulley group 30. After returning, like the first pass, the second pass of wire drawing starts; and so on until the last pass.

[0078] Among them, during use, the wires in multiple passes are divided into Z groups and are respectively arranged on Z different roughness area 113 of the cone pulley 110, and the wire drawing of the wire is performed by winding on each area 113 of the cone pulley 110. For example: in this Embodiment 9, the total number of passes is eight, divided into three groups (Z = 3), the 1st - 3rd passes wind around the first area 113a, the 4th - 5th passes wind around the second area 113b, and the 6th - 8th passes wind around the third area 113c. And from the area 113 where the first pass is located to the area 113 where the last pass is located, the roughness increases from Ra0.05 to Ra0.8.

[0079] In summary, in the wire drawing cone pulley mechanism of the present utility model, the cone pulley 110 is designed to be divided into at least Z section areas 113 with different roughness, and the wires in multiple passes are distributed on multiple different roughness area 113 of the cone pulley 110 for wire drawing, so that at the same rotational speed of the cone pulley 110, the friction coefficient between each area 113 and the wire can be adjusted. Among them, although the Z areas 113 are located on the surface of the same cone pulley 110, due to the different roughness of different areas 113, the friction coefficient between each area 113 and the wire can be adjusted, thus solving the problem of wire breakage caused by too large a difference in the sliding coefficient between the first and last passes due to an increase in the number of drawing passes.

[0080] For the existing segmented stepped cone pulley 110, due to the design requirements of the steps of the cone pulley 110 and the requirements of coaxiality, the number of drawing passes is generally 6 or 8, not exceeding 10; while the design of the cone pulley 110 is divided into at least Z regions 113 with different roughness, which is not limited by the design requirements of the steps of the cone pulley and the requirements of coaxiality, and can be carried out according to the total number of drawing passes M, and the number Z of the regions 113 on the surface 110 of the cone pulley and the roughness of each region 113 can be adjusted adaptively to adapt to the processing of more drawing passes.

[0081] Moreover, through the corresponding cooperation between the cone pulley 110 and the wire drawing die holder 20, and the winding cooperation between the first guide wheel group 30 and the cone pulley 110, while ensuring that the multi-pass wire is distributed on multiple regions 113 with different roughness, the multi-pass drawing is integrated together, effectively saving the equipment space and the wire production space.

[0082] Preferably, as Figures 26-27 shown in Embodiment 9, the surface of each section of the region 113 is coated with a different coating so that the surface roughness of each section of the region 113 is different. Optionally, the coating is one or a combination of an alumina coating, a zirconia coating, a WC coating, a chromium coating, a titanium carbide coating, a titanium nitride coating, a carbonitride coating;

[0083] Preferably, the first guide wheel group 30 includes M first guide wheels 310 arranged in one-to-one correspondence with the wire drawing dies 210. During use, each pass of wire is equipped with a first guide wheel 310 to separate each pass, facilitating the alignment of the wire path and the wire passing buffer for each pass, which is convenient and practical.

[0084] It should be noted that:

[0085] According to the above design concept, for the number Z of the regions 113 with different roughness, it can be adjusted adaptively according to the total number of drawing passes M, including but not limited to the scheme of Embodiment 9. Similarly, for the roughness design of different regions 113, it can be adjusted adaptively according to the total number of drawing passes M, including but not limited to the scheme with the surface roughness Ra of 0.05 - 0.8 described in Embodiment 9;

[0086] In the statements "the cone pulley 110 is axially divided into at least Z regions 113" and "N cone pulleys 110 are staggered in the axial direction" described in this article, the axial direction refers to the rotation axis of the cone pulley 110.

[0087] According to the above design concept, other methods can also be adopted to make the roughness of the Z regions 113 different, including but not limited to the above-mentioned solutions of coating different coatings. Similarly, according to the above design concept, existing coatings other than the above-mentioned alumina coating, zirconia coating, WC coating, chromium coating, titanium carbide coating, titanium nitride coating, and titanium carbonitride coating can also be used for coating to adjust the roughness of the region 113, including but not limited to the embodiments.

[0088] For the combination of the drawing capstan mechanism design one and the drawing capstan mechanism design two:

[0089] In addition, in the solution of forming a capstan group 10 by using N capstans 110 arranged in parallel, according to the above design concept, the capstans 110 in the capstan group 10 can also be set as Z regions 113 with different roughnesses to further improve the single-stage drawing efficiency and drawing quality.

[0090] Such as Figures 9-16 Example 1, Figure 28 As shown in Example 10, the capstan structure is the capstan group 10; the capstan group 10 includes N capstans 110 arranged in parallel. In the solution of the above capstan group 10 design, at least one of the N capstans 110 can also be designed such that the surface of the capstan 110 is divided into at least Z regions 113 along its axial direction; the surface roughness of each region 113 is different, so that the surface friction coefficient of each region 113 is different; where M is greater than or equal to 3, N is greater than or equal to 2 and less than M, Z is greater than or equal to 2 and less than M, and each region 113 and each capstan 110 are subjected to at least one pass of wire drawing.

[0091] In the solution of forming a capstan group 10 by using N capstans 110 arranged in parallel, at least one of the capstans 110 in the capstan group 10 is designed to be Z regions 113 with different roughnesses. During drawing, each region 113 and each capstan 110 are subjected to at least one pass of wire drawing. In this way, the equipment space utilization rate is higher, and the single-stage drawing efficiency and drawing quality are better; for example, Figure 28 in Example 10, one of the capstans 110 is set as Z regions 113 with different roughnesses.

[0092] For the heating furnace 40:

[0093] Such as Figures 7-8 As shown, currently, a single heating wire / tube is used for heating in the heating furnace chamber of the sliding multi-pass drawing device. When a single strand of heating wire is arranged for heating, the temperature in the middle of the furnace chamber is slightly higher. Affected by heat exchange, the actual temperature at the edge is relatively low, and the temperature difference in each region of the furnace chamber is large and cannot be adjusted, thus affecting the quality of the wire.

[0094] As is well known to those skilled in the art, from the first pass to the last pass, the wire diameter specification of the wire material becomes thinner from thick. The multi-pass wire drawing of the wire material is hot drawing. The wire drawing conditions of the wire material have strict requirements for temperature control and regulation. The process requirements for the heating temperature of the wire material with a thick wire diameter specification and the wire material with a thin wire diameter specification are inconsistent. Due to the above design of heating with a single heating wire / tube, when the wire material is in a heated state, the deformation force deviation of the wire material during the die drawing process is large, resulting in serious wire breakage.

[0095] To solve the above problems, the heating furnace 40 structure is designed as follows:

[0096] As Figures 9-16 in Embodiment 1, Embodiments 21-23, Embodiment 4, Figure 24 Embodiment 5, Figure 25 as shown in Embodiments 6-8, the heating furnace 40 for multi-pass drawing includes a furnace body shell 410 and a heating component disposed in the furnace chamber 430 of the furnace body shell 410; the heating component includes Y heating assemblies 420 with independent temperature control settings, where Y is greater than or equal to 2. Preferably, each heating assembly 420 includes a heating wire body 421 and a temperature measuring sensor for measuring temperature; the heating wire body 421 and the temperature measuring sensor are electrically connected to the control system. Preferably, each heating wire body 421 extends along the threading direction of the wire material, so that the heating wire bodies 421 are arranged in parallel in the furnace chamber 430, and the heating wire body 421 is located above and / or below the wire material.

[0097] Specifically, the heating furnace 40 adopts heating assemblies 420 with independent temperature control settings, and the temperature is controlled by the parallel design of multiple (greater than or equal to 2) heating wire bodies 421, replacing the original method of controlling the temperature of the furnace chamber 430 of the heating furnace 40 by a single heating wire as Figures 7-8 shown. Among them, as Figure 22 shown, each heating assembly 420 with independent temperature control settings has an independent temperature measuring sensor, and each heating wire body 421 of each heating assembly 420 has at least one independent temperature measuring point 422 to perform temperature induction and feedback on the heating wire body 421 of the heating assembly 420.

[0098] By adopting the solution of the present invention, the temperature of the heating wire body 421 of the heating assembly 420 with independent temperature control settings can be changed according to the actual temperature requirements, and the heating control can be performed on different positions of the furnace chamber 430 of the heating furnace 40:

[0099] Compared with Figure 7The shown heating furnace 40 adopts a scheme in which a heating wire is bent and arranged in the entire space of the furnace chamber 430. There are large differences in each area of the entire furnace chamber 430. Especially for the same wire, the temperature near the entrance and exit of the furnace chamber 430 is significantly lower than that in the middle area. However, with the design of the heating component 420 of the present utility model, when each wire is in the furnace chamber 430, the temperature uniformity of each section of each wire in the furnace chamber 430 can be improved, the temperature difference between the middle part and the inlet and outlet ends of the wire becomes smaller, reducing the problem of large temperature differences existing in the existing furnace chamber 430 as shown in Figure 8 shown.

[0100] At the same time, since the specifications of the wires in each pass are different, and the process requirements for the heating temperature of the thick-specification wire diameter and the thin-specification wire diameter are inconsistent, by using Y independently temperature-controlled heating components 420, multiple heating components 420 can be controlled at different temperatures, which can meet the temperature gradient design requirements of multi-mode wire drawing, and thus can effectively improve the production quality of the wire. For example Figures 9-16 As shown in Embodiment 1, the present application adopts a parallel design with 4 heating components 420 in parallel. The wire passes passing through above them are different, and each heating component 420 can be correspondingly set at a different temperature to meet the heating temperature requirements of different wire passes passing through above.

[0101] In summary, with the above design: by designing multiple independently temperature-controlled heating components, the temperature of the heating component can be changed according to the actual temperature needs, heating control can be performed on different positions of the heating furnace chamber, the temperature uniformity in the furnace chamber can be effectively improved, and at the same time, the temperature gradient design requirements of multi-mode wire drawing can be met, thereby effectively improving the production quality of the wire.

[0102] It should be noted that:

[0103] The statement in this article that "each heating wire main body 421 extends along the axial direction of the wire, so that Y heating wire main bodies 421 are arranged in parallel in the furnace chamber 430" indicates that the extending direction of each heating wire main body 421 is consistent with the threading direction (axial direction) of the wire, and its extending direction forms a quasi-parallel state with the wire; and several heating wire main bodies 421 form a mutually quasi-parallel state; but it does not mean that the heating wire main body 421 is a straight line, nor does it mean that the shapes of several heating wire main bodies 421 are the same. The shapes can be the same or different. For example, some are continuous circular arcs, some are continuous zigzags, as long as the extending directions of several heating wire main bodies 421 are parallel;

[0104] The heating wire main body 421 is preferably arranged above and / or below the wire; for example Figures 9-16 As shown in Embodiment 1, all the heating wire main bodies 421 are arranged above the wire; as Figures 21-23As shown in Embodiment 4, all the heating wire bodies 421 are arranged below the wire material; according to the above design concept, it is also possible to adopt a design in which a part of the heating wire bodies 421 are arranged above the wire material and a part of the heating wire bodies 421 are arranged below the wire material, including but not limited to the embodiment solutions.

[0105] In this Embodiment 1, the heating wire body 421, the temperature measuring and sensing element are connected to the control system to form temperature feedback and control: the temperature measuring and sensing element senses the temperature of the temperature measuring point 422 and feeds it back to the control system, and the control system controls the heating wire body 421 to adjust the temperature; this feedback and control process is a prior art, and its principle and mechanism will not be elaborated here.

[0106] Preferably, as Figures 9-16 Embodiment 1, Embodiments 21 - 23, Embodiment 4, Figure 24 Embodiment 5, Figure 25 As shown in Embodiments 6 - 8, the heating assembly 420 is detachably connected to the furnace body shell 410.

[0107] By arranging the heating assembly 420 to be detachably connected to the furnace body shell 410, during use, people can adjust the heating temperature by changing the number of the heating assemblies 420, the diameter of each heating wire body 421, the amplitude of bending, the spacing between the bending wave peaks and valleys, and the number of bending peaks (number of turns). By changing the number of the heating assemblies 420 or their own shape and structure to adjust the temperature, it has strong flexibility, so that the heating control can be carried out for different positions of the furnace chamber 430, the temperature uniformity in the furnace chamber 430 can be effectively improved, and at the same time, the temperature gradient design requirements for multi-mode wire drawing can be met.

[0108] Preferably, as Figures 9-16 Embodiment 1, Embodiments 21 - 23, Embodiment 4, Figure 24 Embodiment 5, Figure 25 As shown in Embodiments 6 - 8, the shape of the heating wire body 421 is one or a combination of more than one of circular arc shape, zigzag shape, shaving tooth shape, continuous circular arc shape, continuous zigzag shape, and continuous shaving tooth shape.

[0109] It should be noted that: as Figures 9-16 shown in Embodiment 1, the heating wire body 421 is of a continuous circular arc structure; Figure 25 Embodiments 6 - 8 are arranged from top to bottom in sequence. In Embodiment 6, it is a continuous zigzag shape, in Embodiment 7, it is a continuous shaving tooth shape, and in Embodiment 8, it is a shape combined by circular arc shape, zigzag shape and shaving tooth shape; according to the above design concept, the heating wire body 421 can also be other shape and structure designs, including but not limited to the above solutions.

[0110] Preferably, as Figure 24As shown in Embodiment 5, a glass tube 440 is sleeved outside the heating wire body 421. Preferably, there is a gap between the glass tube 440 and the heating wire body 421, and the gap can be used to fill gas. Preferably, the glass tube 440 is made of heat-resistant glass material. Preferably, the glass tube 440 is made of high-temperature-resistant quartz glass material.

[0111] As Figure 24 shown in Embodiment 5, since a glass tube 440 is sleeved outside the heating wire body 421, the heat radiated by the heating wire body 421 is radiated and diffused in the gas between the glass tube 440 and the heating wire body 421. With the above structural design, the heating temperature of the heating component 420 is more uniform and the temperature control is more precise, and the wire material is heated more uniformly and precisely.

[0112] Preferably, as shown in Embodiment 4 of 21-23, the inner furnace chamber 430 of the furnace body shell 410 is filled with a protective gas. Preferably, the protective gas is one or a combination of nitrogen, helium, neon, argon, xenon, and radon.

[0113] As shown in Embodiment 4 of 21-23, the furnace body shell 410 is designed as a flip type, which is convenient and practical. During use, after covering the flip of the furnace body shell 410 and filling the protective gas in the furnace chamber 430, the atmosphere protection can be carried out during the heating process of the wire material to improve the production quality of the wire material.

[0114] For the tension control mechanism 50 for adjusting the wire material tension:

[0115] When using an existing sliding drawing device for production, regardless of whether the tower wheel style is a segmented stepped type or a straight tube type, when drawing high-strength tungsten wire with a strength exceeding 5500 Mpa, due to the higher deformation resistance of the wire material, the wire material is extremely likely to vibrate during drawing, increasing the friction between the wire material and the tower wheel and resulting in frequent wire breaks. At the same time, it is also very easy to wear the surface of the tower wheel and further deteriorate the wire breakage.

[0116] Moreover, in the current high-strength multi-mode multi-pass wire drawing process, due to the high drawing strength and large drawing force, the wire material vibrates violently, resulting in serious unilateral wear of the die. The pulling force before entering the die is relatively small, while after passing through the die, the wire drawing is affected by the friction force inside the die, and the pulling force after passing through the die is relatively large, resulting in a large difference in pulling force between each die sequence. At the same time, during the multi-mode wire drawing process, the drawing forces between each die sequence are inconsistent, which will lead to the problem of wire material accumulation and thus wire breakage.

[0117] To solve the above problems, a tension control mechanism 50 for adjusting the wire material tension is designed as follows:

[0118] The multi-pass wire drawing equipment includes a tension control mechanism 50 for adjusting the wire tension, a heating furnace 40, and a wire drawing capstan mechanism; the wire drawing capstan mechanism includes a capstan structure, a wire drawing die holder 20, and a first guide wheel set 30, and the capstan structure includes a capstan 110; the heating furnace 40 is arranged between the wire drawing die holder 20 and the first guide wheel set 30, and the tension control mechanism 50 is arranged on the side of the first guide wheel set 30 away from the wire drawing die holder 20; wherein, after the wire passes through the tension control mechanism 50 and the first guide wheel set 30 in sequence, it then passes through the furnace chamber 430 of the heating furnace 40 and the wire drawing die 210 of the wire drawing die holder 20 in sequence, winds around the capstan 110, and returns to the tension control mechanism 50 for the next pass of wire drawing, and so on for multiple passes of wire drawing.

[0119] Preferably, the tension control mechanism 50 includes a tension detection component for detecting the wire tension and a tension adjustment component 510 for adjusting the wire tension; both the tension detection component and the tension adjustment component 510 are electrically connected to the control system.

[0120] A tension control mechanism 50 is arranged at the front end of the first guide wheel set 30 to enable the tension control mechanism 50 to adjust the wire tension: specifically, the tension detection component detects the wire tension and feeds it back to the control system, and the control system controls the tension adjustment component 510 to adjust the wire tension. By adding the above tension feedback system and tension adjustment structure, the pre-die and post-die tension control of the wire can be realized, the problem that it is difficult to match the tensions between different die sequences in the multi-die wire drawing process can be improved, and thus the production quality of the wire can be enhanced;

[0121] A tension control mechanism 50 with a wire passing buffer function is added to solve the problems of large die consumption of the wire drawing die 210, fast wear of the capstan 110, and frequent wire breakage caused by large deformation resistance of high-strength wire (such as tungsten wire) during the wire drawing process, resulting in wire vibration.

[0122] Preferably, the tension adjustment component 510 includes two support wheels 511 and a pressure wheel 512 arranged above the middle of the two support wheels 511; wherein, the height of the pressure wheel 512 is adjustable, and the control system adjusts the wire tension by controlling the pressure wheel 512 to rise or fall.

[0123] As Figures 9-16 shown in Embodiment 1, in use, the tension adjustment component 510 with the above structure is adopted, and the pressure on the wire is adjusted by controlling the pressure wheel 512 to rise or fall, thereby adjusting the wire tension.

[0124] It should be noted that according to the above concept, those skilled in the art can adopt existing tension controllers, such as magnetic powder tension controllers, etc. (whose principles and structures are existing and will not be elaborated here), including but not limited to the above solutions.

[0125] Preferably, a tension control mechanism (50) is provided corresponding to each wire drawing die 210. Preferably, each tension control mechanism 50 is provided with a tension detection component and a tension adjustment component 510, and each tension adjustment component 510 independently adjusts the tension of the wire.

[0126] A tension control mechanism 50 is provided corresponding to each wire drawing die 210, and each tension control mechanism 50 is provided with a tension detection component and a tension adjustment component 510, so that the tension adjustment component 510 corresponding to each wire can independently adjust the tension of the wire. For example, for a tension adjustment component in the form of a pressure wheel 512, the height of the pressure wheel 512 for each wire can be independently controlled for independent tension adjustment. Such a design makes the tension adjustment of the wire more flexible.

[0127] In summary, with the above design: in a multi-pass wire drawing device, a tension control mechanism is designed to adjust the tension of the wire. By adding a tension control mechanism, the pre-die and post-die tension control of the wire can be achieved, and the problem that it is difficult to match the tensions between different die sequences in the multi-die wire drawing process can be improved, thereby improving the production quality of the wire. In the multi-pass wire drawing device of the present invention, a tension control mechanism with a wire passing buffer function is additionally provided to solve the problems of large die wear of the wire drawing die, fast wear of the capstan, and frequent wire breakage caused by the large deformation resistance of the high-strength wire during the drawing process, resulting in wire vibration.

[0128] Preferably, as Figures 9-16 shown in Embodiment 1, a pay-off mechanism 60 is further included, which is used to pay off the wire in the first pass.

[0129] Preferably, as Figures 9-16 shown in Embodiment 1, a take-up mechanism 70 is further included, which is used to take up the wire in the last pass.

[0130] It should be noted that:

[0131] The control system is a prior art. For example, a PLC controller can be used. It has a programmable memory for storing internal programs, executing user-oriented instructions such as logical operations, sequential control, timing, counting, and arithmetic operations, and controlling various types of machinery or production processes through digital or analog input / output. It is a prior art, and its working principle will not be elaborated here. The tension detection component and the tension adjustment component 510 are also prior art devices. The working principle of the process of cooperating with the control system for tension detection, feedback, and adjustment is a prior art, and will not be elaborated here.

[0132] To verify the effect of this application, the following experimental comparison data are given:

[0133] (1) To verify the effect of the solution of the present application that uses a combination of multiple capstans arranged side by side to form a capstan group, the following verification tests are provided:

[0134] Verification Experiment 1: Using the equipment of Example 1 for wire drawing in 8 passes. Among them, two capstans 110 of the capstan group 10 are respectively arranged with 4 passes of wire. The measured results are as follows: the wire breakage rate during drawing is 6.1%, and the average length per single coil is 267,000 meters.

[0135] Comparative Experiment 1: The only difference between the equipment used in Comparative Experiment 1 and that in Verification Experiment 1 is that: using a segmented (8-segment) stepped capstan 110a as shown in Figure 3 to replace the two capstans 110 of the capstan group 10. The measured results are as follows: the wire breakage rate during drawing is 13.9%, and the average length per single coil is 138,000 meters.

[0136] Comparative Experiment 2: The only difference between the equipment used in Comparative Experiment 2 and that in Verification Experiment 1 is that: using a straight cylindrical capstan 110b as shown in Figure 6 to replace the two capstans 110 of the capstan group 10. The measured results are as follows: the wire breakage rate during drawing is 18.5%, and the average length per single coil is 126,000 meters.

[0137] The above data shows that: using the capstan group 10 with two capstans 110 for wire drawing can effectively reduce the wire breakage rate of the wire rod and increase the output length per single coil.

[0138] (2) In order to verify the effect of the heating furnace of the present application, the following verification tests are provided:

[0139] Comparative Experiment 3: Testing the internal temperature uniformity of the heating furnace 40 as shown in Figures 7-8 . Among them, as shown in Figure 7 , the temperature difference between the first temperature zone, the second temperature zone and the third temperature zone is 62°C; the temperature difference between the fourth temperature zone, the fifth temperature zone and the sixth temperature zone is 54°C; the temperature difference between the seventh temperature zone, the eighth temperature zone and the ninth temperature zone is 66°C.

[0140] Verification Experiment 2: Using the heating furnace 40 as shown in Figures 9-16 in Example 1 for temperature uniformity testing. Among them, as shown in Figure 14 , 9 temperature zones the same as those in Comparative Experiment 3 are formed in its furnace chamber 430. The temperature difference between the first temperature zone, the second temperature zone and the third temperature zone is 27°C; the temperature difference between the fourth temperature zone, the fifth temperature zone and the sixth temperature zone is 18°C; the temperature difference between the seventh temperature zone, the eighth temperature zone and the ninth temperature zone is 22°C.

[0141] The above data shows that: adopting the heating scheme of the present utility model can effectively ensure the temperature uniformity of the heating area, thereby ensuring the temperature uniformity of each pass of wire in the middle part and the inlet and outlet parts of the furnace chamber 430.

[0142] (3) In order to verify the effect of adding the glass tube 440 outside the heating wire main body 421 of the present application, the following verification tests are provided:

[0143] Verification Experiment 3: The only difference between the equipment used in this experiment and that in Verification Experiment 2 is that a heat-resistant glass tube 440 is sleeved outside the heating wire body 421 in Verification Experiment 3. The measured data are as follows: the temperature difference between the first temperature zone, the second temperature zone, and the third temperature zone is 15 °C; the temperature difference between the fourth temperature zone, the fifth temperature zone, and the sixth temperature zone is 9 °C; the temperature difference between the seventh temperature zone, the eighth temperature zone, and the ninth temperature zone is 17 °C.

[0144] The above data indicate that by adding a glass tube 440 around the heating wire body 421, the heating uniformity can be further improved.

[0145] (4) In order to verify the effect of the solution of arranging multiple cone pulleys side by side to form a cone pulley group in the present application when it is applied to wire drawing with more passes, the following verification tests are provided:

[0146] Verification Experiment 4: The only difference between the equipment used in Verification Experiment 4 and that in Verification Experiment 1 is that the number of straight cylindrical cone pulleys 110 used is 3, the number of wire drawing dies 210 is 12 (12 corresponding to the first guide pulley 310), the first cone pulley 110 distributes 5 wire rods (the one close to the wire drawing die 210), the second cone pulley 110 distributes 4 wire rods, and the third cone pulley 110 distributes 3 wire rods. The measured results are as follows: the wire breakage rate during wire drawing is 8.7%, and the average length per single coil is 238,000 meters;

[0147] Verification Experiment 5: The only difference between the equipment used in Verification Experiment 5 and that in Verification Experiment 4 is that the number of cone pulleys 110 used is 2, including one straight cylindrical cone pulley 110b and one stepped cone pulley 110a (divided into 4 sections). The straight cylindrical cone pulley 110b distributes 4 wire rods (the one close to the wire drawing die 210), and the stepped cone pulley 110a distributes 4 wire rods. The measured results are as follows: the wire breakage rate during wire drawing is 5.9%, and the average length per single coil is 269,000 meters;

[0148] Verification Experiment 6: The only difference between the equipment used in Verification Experiment 6 and that in Verification Experiment 4 is that the number of cone pulleys 110 used is 2, both of which are stepped cone pulleys 110a (divided into 4 sections). The first stepped cone pulley 110a distributes 4 wire rods (the one close to the wire drawing die 210), and the second stepped cone pulley 110a distributes 4 wire rods. The measured results are as follows: the wire breakage rate during wire drawing is 7.9%, and the average length per single coil is 253,000 meters;

[0149] Verification Experiment Seven: The only difference between the equipment used in this verification experiment and that in Verification Experiment Four is that: the number of cone pulleys 110 used is 3, the number of wire drawing dies 210 is 8 (8 corresponding to the first guide pulley 310), the first cone pulley 110 distributes 3 wire rods (the one closer to the wire drawing die 210), the second cone pulley 110 distributes 3 wire rods, and the third cone pulley 110 distributes 2 wire rods. The measured results are: the wire breakage rate during drawing is 4.6%, and the average length per single coil is 292,000 meters;

[0150] Comparison Experiment Four: The only difference between the equipment used in this comparison experiment and that in Verification Experiment Four is that: a stepped cone pulley 110a with one section (12 sections) is used to replace the three cone pulleys 110 of the cone pulley set 10. The measured results are: the wire breakage rate during drawing is 30.8%, and the average length per single coil is 65,000 meters;

[0151] Comparison Experiment Five: The only difference between the equipment used in this comparison experiment and that in Verification Experiment Four is that: a straight cylindrical cone pulley 110b is used to replace the three cone pulleys 110 of the cone pulley set 10. The measured results are: the wire breakage rate during drawing is 43.2%, and the average length per single coil is 42,000 meters.

[0152] The above data shows that: using the cone pulley set 10 composed of multiple cone pulleys 110 for drawing can effectively reduce the wire breakage rate of the wire rod and increase the output length per single coil.

[0153] Compared with the prior art, the solution of the embodiment of the present utility model has the following beneficial effects:

[0154] (1) The wire drawing cone pulley mechanism of the present utility model: It adopts the method of combining multiple cone pulleys arranged side by side to form a cone pulley set. Through the corresponding cooperation between the cone pulley set and the wire drawing die holder, and the winding cooperation between the first guide pulley set and the cone pulley set, multiple passes of wire rods are distributed on multiple cone pulleys, solving the problem of wire breakage caused by too large a difference in the sliding coefficient between the first and last passes due to an increase in the number of drawing passes. The single - machine drawing efficiency is significantly improved;

[0155] Moreover, due to the winding cooperation design of the cone pulley set, the wire drawing die holder, and the first guide pulley set, on the basis of ensuring that multiple passes of wire rods are distributed on multiple cone pulleys, multiple - pass drawing is integrated together, effectively saving the equipment space and the wire rod production space.

[0156] (2) The wire drawing cone pulley mechanism of the present utility model: The cone pulley is designed to be divided into at least Z regions with different roughnesses, solving the problem of wire breakage caused by too large a difference in the sliding coefficient between the first and last passes due to an increase in the number of drawing passes. The single - machine drawing efficiency is significantly improved.

[0157] (3) The design of the present utility model has multiple heating components with independent temperature control settings. According to the actual temperature requirements, the temperature of the heating components can be changed, and the heating control can be carried out for different positions of the heating furnace, which can effectively improve the temperature uniformity in the furnace. At the same time, it can meet the temperature gradient design requirements of multi-mode wire drawing, thus effectively improving the quality of wire production.

[0158] (4) In the multi-pass wire drawing equipment of the present utility model, a tension control mechanism is designed to adjust the tension of the wire: by adding a tension control mechanism, the pre-die and post-die tension control of the wire can be realized, and the problem that it is difficult to match the tensions between different die sequences in the multi-mode wire drawing process can be improved, thereby improving the quality of wire production.

[0159] In the multi-pass wire drawing equipment of the present utility model, a tension control mechanism with a wire passing buffer function is added to solve the problems of large die consumption of the wire drawing die, fast wear of the capstan, and frequent wire breakage caused by the large deformation resistance of high-strength wire during the drawing process, which makes the wire shake.

[0160] Although terms such as capstan group, wire drawing die holder, and first guide wheel group are used more frequently in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

[0161] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A multi-pass wire drawing device, comprising a drawing tower wheel mechanism and a heating furnace (40) for heating the wires of each pass; characterized in that: The pulling step pulley mechanism comprises a step pulley (110); the surface of the step pulley (110) is divided into at least Z sections (113) along its axial direction; wherein the surface roughness of each section of the section (113) is different, so that the surface friction coefficient of each section of the section (113) is different; The total number of drawing passes is M, and when M is greater than or equal to 2, Z is greater than or equal to 2 and less than or equal to M, so that each area (113) is subjected to at least one wire drawing pass.

2. The multi-pass wire drawing device according to claim 1, characterized in that: The surface of each section of the region (113) is coated with a different coating so that the surface roughness of each section of the region (113) is different.

3. The multi-pass wire drawing device according to claim 2, characterized in that: The surface roughness Ra of the region (113) is 0.05 to 0.

8.

4. The multi-pass wire drawing device according to claim 2, characterized in that: The coatings include aluminum oxide coatings, zirconium oxide coatings, WC coatings, chromium coatings, titanium carbide coatings, titanium nitride coatings, and titanium carbonitride coatings.

5. The multi-pass wire drawing apparatus according to claim 1, characterized in that: The drawing tower wheel mechanism further comprises a wire drawing die frame (20) and a first guide wheel assembly (30) which are sequentially arranged on one side of the tower wheel (110); The wire drawing die frame (20) comprises M wire drawing dies (210); the first guide wheel assembly (30) comprises M first guide wheels (310) arranged in one-to-one correspondence with the wire drawing dies (210); The wire is guided by the first guide wheel assembly (30), passes through the die opening of the wire drawing die (210), is wound around the tower wheel (110), and is wound back onto the first guide wheel assembly (30), and is repeatedly drawn for multiple passes.

6. The multi-pass wire drawing equipment according to claim 1, characterized in that: The heating furnace comprises a furnace shell (410) and a heating component arranged in a furnace chamber (430) of the furnace shell (410); the heating component comprises Y heating components (420) with independent temperature control settings, where Y is greater than or equal to 2.

7. The multi-pass wire drawing apparatus according to claim 6, characterized in that: The heating component (420) is detachably connected to the furnace shell (410); And / or, each of the heating components (420) comprises a heating wire body (421) and a temperature sensing component for measuring temperature; and the heating wire body (421) and the temperature sensing component are both connected to a control system.

8. The multi-pass wire drawing apparatus according to claim 7, characterized in that: Each of the heating wire bodies (421) extends along the axial direction of the wire material, so that Y heating wire bodies (421) are arranged in parallel in the furnace (430); The heating wire body (421) is located above the wire material and / or below the wire material.

9. The multi-pass wire drawing apparatus according to any one of claims 7-8, characterized in that: The heating wire body (421) is sheathed with a glass tube (440); a gap is provided between the glass tube (440) and the heating wire body (421), and the gap can be used to fill gas; and / or, The inner furnace chamber (430) of the furnace shell (410) is filled with protective gas.

10. The multi-pass wire drawing apparatus according to claim 5, characterized in that: Also included is a tension control mechanism (50) for adjusting the tension of the wire; The heating furnace (40) is arranged between the wire drawing die frame (20) and the first guide wheel assembly (30), and the tension control mechanism (50) is arranged on a side of the first guide wheel assembly (30) away from the wire drawing die frame (20); The wire passes through the tension control mechanism (50) and the first guide wheel assembly (30) in sequence, and then passes through the furnace (430) of the heating furnace (40) and the drawing die (210) of the drawing die frame (20) in sequence, and is then wound around the tower wheel structure, and multiple drawing passes are performed in this reciprocating manner.

Images