Wire drawing die and steel wire drawing die

Abstract

The utility model provides a wire drawing die and a steel wire drawing die, and relates to the technical field of steel wire drawing. The wire drawing die comprises a die sleeve and a die core, a drawing hole is formed in the die core, and the drawing hole comprises an assembling section and a forming section which are connected in sequence; and a wear-resistant layer is arranged in the forming section and is in smooth transition connection with the assembling section. Wherein the wear-resistant layer is arranged on the forming section, so that the die core can be prevented from being scratched by the steel wire, and the wear-resistant layer is in smooth transition connection with the assembly section, so that the pressure die and the assembly section are propped against each other more stably and tightly, the wear-resistant layer is prevented from being damaged by axial force when the steel wire passes, and the service life of the wire-drawing die is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of steel wire drawing, and particularly to a wire drawing die and a steel wire drawing die. Background Art

[0002] Steel wire drawing refers to a plastic processing process in which a steel wire is gradually reduced in diameter through multiple tractions to increase the drawing ratio of the steel wire.

[0003] When drawing steel wires, a steel wire drawing die is required. The steel wire drawing die includes a pressure die and a wire drawing die. The die nozzle of the pressure die is in tight fit with the drawing hole of the wire drawing die. The pressure die has a receiving cavity communicating with the die nozzle, and the receiving cavity is filled with wire drawing powder for lubrication. The steel wire enters the drawing hole of the wire drawing die through the die nozzle of the pressure die together with the wire drawing powder, so that the steel wire is extruded by the drawing hole under the lubrication of the wire drawing powder, thereby reducing the diameter of the steel wire and completing the drawing.

[0004] However, the drawing hole of the wire drawing die is easily scratched by the steel wire to form burrs, resulting in a short service life of the wire drawing die. Utility Model Content

[0005] This application provides a wire drawing die and a steel wire drawing die to solve the technical problem that the existing wire drawing die is easily damaged by burrs and has a short service life.

[0006] In a first aspect, this application provides a wire drawing die for a steel wire drawing die, including a die sleeve and a die core embedded in the die sleeve. The die core is provided with a drawing hole, and the drawing hole includes an assembly section and a forming section connected in sequence. The assembly section is used to abut against the die nozzle of the pressure die of the steel wire drawing die, and the forming section is used to extrude the steel wire to reduce the diameter of the steel wire;

[0007] A wear-resistant layer is provided in the forming section, and the wear-resistant layer is smoothly and transitionally connected to the assembly section.

[0008] In a possible implementation manner, for the wire drawing die provided in this application, the forming section includes a compression section and a sizing section. The compression section and the sizing section are coaxially and sequentially connected to the assembly section. Both ends of the compression section are connected to the assembly section and the sizing section respectively, and the diameter of the sizing section is smaller than that of the compression section;

[0009] A wear-resistant layer is provided in at least one of the compression section and the sizing section.

[0010] In a possible implementation manner, for the wire drawing die provided in this application, the wear-resistant layer includes a first wear-resistant layer and a second wear-resistant layer. The first wear-resistant layer is provided in the compression section, and the second wear-resistant layer is provided in the sizing section. The second wear-resistant layer is smoothly and transitionally connected to the first wear-resistant layer.

[0011] In a possible implementation, for the wire drawing die provided in the present application, the compression section is a tapered diameter-changing section. The large-diameter end of the diameter-changing section is connected to the assembly section, and the small-diameter end of the diameter-changing section is connected to the sizing section;

[0012] The compression angle of the compression section 2121 is greater than or equal to 10.5° and less than or equal to 11.5°.

[0013] In a possible implementation, for the wire drawing die provided in the present application, when the diameter of the compression section is greater than or equal to 3 mm, the length of the compression section is greater than or equal to 5.5 mm and less than or equal to 8 mm;

[0014] When the diameter of the compression section is less than 3 mm, the length of the compression section is greater than or equal to 3.0 mm and less than or equal to 5.5 mm.

[0015] In a possible implementation, for the wire drawing die provided in the present application, when the die core is used for intermediate processing, the length of the sizing section is 0.70 - 0.80 times the diameter of the sizing section;

[0016] When the die core is used for finished product processing, the length of the sizing section is 0.85 - 0.95 times the diameter of the sizing section.

[0017] In a possible implementation, for the wire drawing die provided in the present application, the wear-resistant layer is at least one of a nano layer, a cemented carbide layer, and a diamond layer, and the die core is a tungsten steel part.

[0018] In a possible implementation, for the wire drawing die provided in the present application, the drawing hole further includes an exit flare. The small-diameter end of the exit flare is connected to the end of the forming section far from the assembly section, and the large-diameter end of the exit flare is connected to the end face of the die core.

[0019] In a possible implementation, for the wire drawing die provided in the present application, the die sleeve is provided with a mounting hole, the die core is embedded in the mounting hole, and the drawing hole communicates with the mounting hole.

[0020] On the other hand, the present application provides a steel wire drawing die, which includes a pressure die and any one of the above wire drawing dies, and the pressure die is in abutting cooperation with the wire drawing die.

[0021] The wire drawing die and the steel wire drawing die provided by the present application. The wire drawing die is provided with a wear-resistant layer at the forming section of the drawing hole of the die core, and the wear-resistant layer and the assembly section for abutting against the pressure die are smoothly and transitionally connected. Among them, the wear-resistant layer is provided at the forming section, and the wear-resistant layer is coated on the inner circumferential surface of the forming section. When the wire drawing powder and the steel wire pass through the forming section, they can directly contact the wear-resistant layer to avoid scratching the die core by the steel wire and improve the service life of the wire drawing die. Moreover, the wear-resistant layer and the assembly section are smoothly and transitionally connected, and the wear-resistant layer is not provided at the assembly section. This partial coating structure enables the abutment between the pressure die and the assembly section to be more stable and tight, avoiding the repeated abutment of the pressure die against the assembly section from damaging the assembly section and the wear-resistant layer and causing wire drawing powder leakage. When the wire drawing powder and the steel wire pass through the assembly section and enter the forming section, it can also avoid the mutual friction between the steel wire and the edge of the wear-resistant layer and prevent the wear-resistant layer from being damaged by the axial force when the steel wire passes, further improving the service life of the wire drawing die. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Structural schematic diagram of the wire drawing die provided by the embodiment of the present application;

[0024] Figure 2 Structural schematic diagram of the steel wire drawing die provided by the embodiment of the present application.

[0025] Description of the reference numerals in the drawings:

[0026] 100 - die sleeve;

[0027] 110 - mounting hole;

[0028] 200 - die core;

[0029] 210 - drawing hole; 211 - assembly section; 212 - forming section; 2121 - compression section; 2122 - sizing section; 213 - die exit flare;

[0030] 220 - first wear-resistant layer;

[0031] 230 - second wear-resistant layer;

[0032] 300 - pressure die;

[0033] 310 - die tip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions, and advantages of this application more clear, the following will describe the technical solutions in the embodiments of this application in more detail with reference to the accompanying drawings in the preferred embodiments of this application. In the drawings, the same or similar reference numerals represent the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are some but not all of the embodiments of this application. The embodiments described below with reference to the drawings are exemplary and are intended to explain this application and should not be construed as a limitation of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application. The following will explain the embodiments of this application in detail with reference to the drawings.

[0035] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense and can be used interchangeably. For example, "connected" can be a direct connection or an indirect connection through an intermediate medium; it can be a fixed connection (such as a non-removable fixed connection like welding, and a removable fixed connection using a fixing structure such as a screw), or a sliding connection. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application 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 therefore should not be construed as a limitation of this application.

[0037] The terms "first", "second", "third" (if any) in the description and claims of this application and the above drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0038] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or display that includes a series of steps or modules does not necessarily have to be limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products, or displays.

[0039] Existing steel wires, such as aluminum-clad Invar steel wires, are bimetallic materials composed of Invar alloy steel wires and aluminum based on continuous extrusion and cladding technology. They have characteristics such as high strength and corrosion resistance. When drawing, steel wire drawing dies are required, and the drawing is completed in cooperation with a lubricating medium, wire drawing powder. The steel wire drawing die usually includes a pressure die and a drawing die. The drawing hole of the pressure die is in tight fit with the drawing die. The pressure die is filled with wire drawing powder for lubrication. The steel wire enters the drawing hole of the drawing die together with the lubricating powder through the pressure die, so that the steel wire is extruded and thinned by the drawing hole under the lubrication of the wire drawing powder to complete the drawing.

[0040] However, for aluminum-clad Invar steel wires, their high strength makes the drawing holes of the drawing dies prone to being scratched and damaged by the steel wires. Once the drawing holes are scratched and damaged, the processing quality of the steel wire drawing cannot be guaranteed. For example, the existing drawing dies can normally draw steel wires about 200 to 500 kilometers, while for aluminum-clad Invar steel wires, the shortest distance that the drawing die can draw is only 8 kilometers, and the longest is only 210 kilometers. Therefore, the service life of the existing drawing dies is short.

[0041] In order to overcome the defects in the prior art, the present application provides a drawing die and a steel wire drawing die. The drawing die is provided with a wear-resistant layer in the forming section of the die core drawing hole, and the wear-resistant layer and the assembly section for abutting against the pressure die are smoothly and transitionally connected. When the wire drawing powder and the steel wire pass through the forming section, they can directly contact the wear-resistant layer to avoid scratching the die core by the steel wire. Moreover, the wear-resistant layer and the assembly section are smoothly and transitionally connected, and no wear-resistant layer is provided in the assembly section, so that the abutment between the pressure die and the assembly section is more stable and tight. When the wire drawing powder and the steel wire pass through the assembly section and enter the forming section, it can also avoid the mutual friction between the steel wire and the edge of the wear-resistant layer and prevent the wear-resistant layer from being damaged by the axial force when the steel wire passes through, thereby improving the service life of the drawing die.

[0042] The content of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0043] Refer to Figure 1 and Figure 2 As shown, an embodiment of the present application provides a drawing die for a steel wire drawing die, including a die sleeve 100 and a die core 200 embedded in the die sleeve 100. The die core 200 is provided with a drawing hole 210. The drawing hole 210 includes an assembly section 211 and a forming section 212 that are connected in sequence. The assembly section 211 is used for abutting against the pressure die 300 of the steel wire drawing die, and the forming section 212 is used for extruding the steel wire to reduce the diameter of the steel wire.

[0044] A wear-resistant layer is provided in the forming section 212, and the wear-resistant layer is smoothly and transitionally connected to the assembly section 211.

[0045] Among them, when the die core 200 is specifically installed with the die sleeve 100, exemplarily, an installation hole 110 can be formed on the die sleeve 100. An installation position adapted to the die core 200 is arranged in the middle section of the installation hole 110, and the die core 200 is embedded in the installation position. To enable the steel wire to be smoothly drawn, the drawing hole 210 of the die core 200 communicates with the installation hole 110 of the die sleeve 100 to form a through channel.

[0046] At both ends of the installation hole 110, flared openings are respectively arranged. The small-diameter end of the flared opening faces the installation position of the die core 200, and the large-diameter end is away from the installation position of the die core 200. Moreover, the radial dimension of the small-diameter end of the flared opening on the side facing the pressure die 300 is greater than or equal to the radial dimension of the installation position of the die core 200, and the radial dimension of the small-diameter end of the flared opening on the side away from the pressure die 300 is smaller than the radial dimension of the installation position of the die core 200. In this way, a stop surface facing the pressure die 300 can be formed at the installation position, so that the end surface of the die core 200 abuts against the stop surface, preventing the die core 200 from moving along with the steel wire during the drawing of the steel wire and ensuring the drawing quality of the steel wire. Exemplarily, in this embodiment, the radial dimension of the small-diameter end of the flared opening on the side facing the pressure die 300 is equal to the radial dimension of the installation position of the die core 200.

[0047] A drawing hole 210 is arranged along the extending direction of the installation hole 110 on the die core 200. According to the different functions of each section of the drawing hole 210, the drawing hole 210 is divided into an assembly section 211 and a forming section 212 that are connected in sequence.

[0048] Among them, the assembly section 211 is used for abutting and cooperating with the die nozzle 310 of the pressure die 300. Therefore, the assembly section 211 is arranged as a flared opening structure facing the die nozzle 310 of the pressure die 300, and the taper of the flared opening should be greater than or equal to the taper of the die nozzle 310 of the pressure die 300, so that the die nozzle 310 can be closely abutted against the assembly section 211 to prevent the leakage of drawing powder.

[0049] Exemplarily, in this embodiment, the taper of the assembly section 211 is slightly greater than the taper of the die nozzle 310. In other embodiments, the taper of the assembly section 211 can also be set to be the same as the taper of the die nozzle 310, and the present application does not limit this.

[0050] Moreover, the forming section 212 is used to extrude the steel wire and the wire drawing powder entering the drawing hole 210, so that the steel wire becomes thinner and longer under the extrusion of the die core 200 and the lubrication of the wire drawing powder, and the drawing ratio of the thick steel wire is increased. A wear-resistant layer is provided on the forming section 212. The wear-resistant layer is provided on the inner circumferential surface of the forming section 212. Therefore, when the steel wire and the wire drawing powder pass through the forming section 212, they are both in direct contact with the wear-resistant layer, and the forming section 212 extrudes through the wear-resistant layer to deform. In this way, the forming section 212 of the die core 200 can be protected by the wear-resistant layer to prevent the steel wire from directly scratching the die core 200, and the hardness of the wear-resistant layer 220 is greater than that of the steel wire, so it is difficult for the steel wire to cause scratching damage to the wear-resistant layer 220, thereby improving the service life of the wire drawing die.

[0051] Furthermore, no wear-resistant layer is provided on the assembly section 211. Therefore, after the wear-resistant layer is provided on the forming section 212, the part where the wear-resistant layer is connected to the assembly section 211 can be rough-ground and finish-ground, so that the wear-resistant layer and the assembly section 211 are smoothly transition-connected. In this way, it does not interfere with the tight abutting fit between the die nozzle 310 and the assembly section 211, and avoids setting a harder wear-resistant layer on the assembly section 211, resulting in the wear-resistant layer being damaged by the die nozzle 310 of the pressure die 300. It can also prevent the steel wire from rubbing against the edge of the wear-resistant layer when it first enters the forming section 212, and then causing an axial force ring to the edge of the wear-resistant layer, effectively protecting the wear-resistant layer.

[0052] Therefore, the wire drawing die provided by the embodiment of the present application sets a wear-resistant layer on the forming section 212 of the drawing hole 210 of the die core 200, and makes the wear-resistant layer and the assembly section 211 for abutting against the pressure die 300 smoothly transition-connected. Among them, setting the wear-resistant layer on the forming section 212 makes the wear-resistant layer cover the inner circumferential surface of the forming section 212. When the wire drawing powder and the steel wire pass through the forming section 212, they can be directly in contact with the wear-resistant layer to prevent the steel wire from scratching the die core 200 and improve the service life of the wire drawing die.

[0053] Moreover, the wear-resistant layer and the assembly section 211 are set to be smoothly transition-connected, and no wear-resistant layer is provided on the assembly section 211. This local coating structure makes the abutting between the pressure die 300 and the assembly section 211 more stable and tight, avoiding the repeated abutting of the pressure die 300 against the assembly section 211 from damaging the assembly section 211 and the coating and causing wire drawing powder leakage. When the wire drawing powder and the thick steel wire pass through the assembly section 211 and enter the forming section 212, it can also prevent the steel wire from rubbing against the edge of the wear-resistant layer 220 and prevent the wear-resistant layer from being damaged by the axial force when the steel wire passes through, further improving the service life of the wire drawing die.

[0054] In some embodiments, referring to Figure 1As shown, the forming section 212 includes a compression section 2121 and a sizing section 2122. The compression section 2121 and the sizing section 2122 are coaxially and sequentially connected to the assembly section 211. Both ends of the compression section 2121 are connected to the assembly section 211 and the sizing section 2122 respectively. The diameter of the sizing section 2122 is smaller than that of the compression section 2121.

[0055] A wear-resistant layer is provided in at least one of the compression section 2121 and the sizing section 2122.

[0056] In addition, the diameter of the sizing section 2122 is set to be slightly smaller than that of the compression section 2121, which is equivalent to the rough steel wire being compressed twice by the compression section 2121 and the sizing section 2122 respectively. It is easier to ensure the size of the processed steel wire. And by setting it in this way, the compression section 2121 and the sizing section 2122 can be used to gradually extrude the steel wire in segments, so that the stability of the steel wire drawing is higher and the steel wire is prevented from being broken.

[0057] Refer to Figure 1 As shown, in some embodiments, the wear-resistant layer includes a first wear-resistant layer 220 and a second wear-resistant layer 230. The first wear-resistant layer 220 is provided in the compression section 2121, and the second wear-resistant layer 230 is provided in the sizing section 2122. The second wear-resistant layer 230 is smoothly and transitionally connected to the first wear-resistant layer 220.

[0058] It can be understood that by providing the first wear-resistant layer 220 in the compression section 2121 and the second wear-resistant layer 230 in the sizing section 2122, when the steel wire passes through the compression section 2121 and the sizing section 2122, it can contact the first wear-resistant layer 220 and the second wear-resistant layer 230 in sequence, avoiding the steel wire from scratching the compression section 2121 and the sizing section 2122, and thus improving the service life of the wire drawing die.

[0059] The hardness of the second wear-resistant layer 230 is the same as that of the first wear-resistant layer 220, and it is smoothly and transitionally connected to the first wear-resistant layer 220. That is, when the second wear-resistant layer 230 is provided, the first wear-resistant layer 220 with the same hardness as the second wear-resistant layer 230 can be provided at the same time, which simplifies the processing of the die core 200, reduces the processing cost, and facilitates the guarantee of the product quality of the steel wire drawing.

[0060] In some embodiments, the compression section 2121 is a tapered variable-diameter section. The large-diameter end of the variable-diameter section is connected to the assembly section 211, and the small-diameter end of the variable-diameter section is connected to the sizing section 2122.

[0061] The compression angle α of the compression section 2121 is greater than or equal to 10.5° and less than or equal to 11.5°, that is, the value range of the compression angle α is 10.5° ≤ α ≤ 11.5°.

[0062] The compression angle α refers to the angle between the two axially opposite sides of the compression section 2121. Generally, the harder the material to be drawn, the smaller the value of the compression angle α. Since the first wear-resistant layer 220 is provided in the compression section 2121 in this application, which improves the compression ability of the compression section 2121, the value of the compression angle α of the original wire drawing die can be increased from 8° to 10.5° - 11.5°, thereby improving the drawing efficiency of the wire drawing die.

[0063] Exemplarily, in this embodiment, the value of the compression angle α of the compression section 2121 can be set to 11°. In other embodiments, the value of the compression angle α of the compression section 2121 can also be set to 10.5°, 10.8°, 11.2°, or 11.5°. This application does not limit this.

[0064] Correspondingly, to ensure the wire drawing quality of the steel wire after the compression angle α is increased, in some embodiments, when the diameter D1 of the compression section 2121 is greater than or equal to 3 mm, the length of the compression section 2121 is greater than or equal to 5.5 mm and less than or equal to 8 mm, that is, the value range of the length L1 of the compression section 2121 is 5.5 mm ≤ L1 ≤ 8 mm;

[0065] When the diameter D1 of the compression section 2121 is less than or equal to 3 mm, the length of the compression section 2121 is greater than or equal to 3.0 mm and less than or equal to 5.5 mm, that is, the value range of the length L1 of the compression section 2121 is 3.0 mm ≤ L1 ≤ 5.5 mm.

[0066] It can be understood that with such a setting, compared with the original situation where when the diameter D1 is greater than or equal to 3 mm, the value range of the length L1 of the compression section 2121 is 4.5 mm ≤ L1 ≤ 7.5 mm; when the diameter D1 of the compression section 2121 is less than or equal to 3 mm, the value range of the length L1 of the compression section 2121 is 2.3 mm ≤ L1 ≤ 4.5 mm, the overall length of the compression section 2121 of the wire drawing die in this application is increased to appropriately slow down the deformation rate of the steel wire drawing while the compression angle α is increased, further ensuring the wire drawing quality of the steel wire.

[0067] Exemplarily, in this embodiment, when the diameter D1 of the compression section 2121 is greater than or equal to 3 mm, the length L1 of the compression section 2121 can be taken as 6.5 mm, and when the diameter D1 of the compression section 2121 is less than or equal to 3 mm, the length L1 of the compression section 2121 can be taken as 4 mm.

[0068] In other embodiments, when the diameter D1 of the compression section 2121 is greater than or equal to 3 mm, the length L1 of the compression section 2121 can also be 4.5 mm, 5 mm, 6 mm, 7 mm or 7.5 mm. When the diameter D1 of the compression section 2121 is less than or equal to 3 mm, the length L1 of the compression section 2121 can also be 2.3 mm, 2.5 mm, 3 mm, 3.5 mm or 4.5 mm.

[0069] Further, in some embodiments, referring to Figure 1 as shown, the length of the sizing section 2122 is L2, and the radial dimension of the sizing section 2122 is D2;

[0070] When the die core 200 is used for intermediate processing, the length L2 of the sizing section 2122 is 0.70 - 0.80 times the diameter D2 of the sizing section 2122, that is, L2 = D2·(75 ± 5)%;

[0071] When the die core 200 is used for finished product processing, the length L2 of the sizing section 2122 is 0.85 - 0.95 times the diameter D2 of the sizing section 2122, that is, L2 = D2·(90 ± 5)%.

[0072] It can be understood that the steel wire is secondarily compressed through the sizing section 2122 to obtain a stable final size. By setting a reasonable length of the sizing section 2122, the powder coating effect of the drawing powder on the steel wire during the drawing process can be improved, and the drawing quality of the steel wire can be improved, such as the straightness, dimensional accuracy, and surface roughness of the steel wire, and the service life of the drawing die can also be extended.

[0073] Exemplarily, in this embodiment, the radial dimension D2 of the sizing section 2122 can be taken as 2 mm. When the die core 200 is used for intermediate processing, the length L2 of the sizing section 2122 is 1.5 ± 0.1 mm. When the die core 200 is used for finished product processing, the length L2 of the sizing section 2122 is 1.8 ± 0.1 mm.

[0074] In other embodiments, the radial dimension D2 of the sizing section 2122 can also be taken as 3 mm. When the die core 200 is used for intermediate processing, the length L2 of the sizing section 2122 is 2.25 ± 0.15 mm. When the die core 200 is used for finished product processing, the length L2 of the sizing section 2122 is 2.70 ± 0.15 mm.

[0075] In specific implementation, referring to Figure 1 as shown, the wear-resistant layer is at least one of a nano layer, a cemented carbide layer, and a diamond layer, and the die core 200 is a tungsten steel part.

[0076] It can be understood that setting the first wear-resistant layer 220 and the second wear-resistant layer 230 as nano-layers, cemented carbide layers, and diamond layers facilitates making the first wear-resistant layer 220 and the second wear-resistant layer 230 have better hardness, so that the wire drawing die has a longer service life.

[0077] In addition, the die sleeve 100 can be set to be made of #45 steel, so that the die sleeve 100 and the die core 200 mainly used for drawing are made of two materials, which can effectively reduce the cost of the wire drawing die.

[0078] Furthermore, in some embodiments, referring to Figure 1 and Figure 2 as shown, the drawing hole 210 further includes a die exit flare 213. The small-diameter end of the die exit flare 213 is connected to the end of the forming section 212 away from the assembly section 211, and the large-diameter end of the die exit flare 213 is connected to the end face of the die core 200.

[0079] It can be understood that by providing the die exit flare 213 in the sizing section 2122, the steel wire processed through the compression section 2121 and the sizing section 2122 can smoothly leave the sizing section 2122, avoiding over-extrusion damage to the steel wire and ensuring the processing quality of the product.

[0080] The embodiment of the present application also provides a steel wire drawing die. Referring to Figure 2 as shown, it includes a pressure die 300 and the wire drawing die in any of the above embodiments. The pressure die 300 is in abutting cooperation with the wire drawing die. In specific implementation, the die nozzle 310 of the pressure die 300 is closely abutted against the assembly section 211 of the wire drawing die.

[0081] The wire drawing die has been described in detail in the above embodiments and will not be elaborated here.

[0082] The embodiment of the present application provides a steel wire drawing die. By providing a wire drawing die, the wire drawing die is provided with a wear-resistant layer 220 in the forming section 212 of the drawing hole 210 of the die core 200, and the wear-resistant layer and the assembly section 211 for abutting against the pressure die 300 are smoothly and transitionally connected. A wear-resistant layer is provided in the assembly section 211, and the wear-resistant layer is coated on the inner peripheral surface of the assembly section 211. When the drawing powder and the steel wire pass through the assembly section 211, they can directly contact the wear-resistant layer to avoid scratching the die core 200 by the rough steel wire and improve the service life of the wire drawing die.

[0083] Moreover, the wear-resistant layer and the assembly section 211 are set to be smoothly transitionally connected, and the wear-resistant layer is not provided on the assembly section 211. This local coating structure enables the abutment between the pressure die 300 and the assembly section 211 to be more stable and tight, avoiding damage to the assembly section 211 and the coating caused by the repeated abutment of the pressure die 300 against the assembly section 211, and preventing the leakage of wire drawing powder. When the wire drawing powder and the steel wire enter the forming section 212 through the assembly section 211, it can also avoid the mutual friction between the steel wire and the edge of the wear-resistant layer, preventing the wear-resistant layer from being damaged by the axial force when the steel wire passes through, and further improving the service life of the wire drawing die.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application 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 described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wire drawing die for steel wire drawing, characterized in that: The invention comprises a die sleeve (100) and a die core (200) embedded in the die sleeve (100); the die core (200) is provided with a drawing hole (210); the drawing hole (210) comprises an assembly section (211) and a forming section (212) connected in sequence; the assembly section (211) is used to abut against a die mouth (310) of a pressure die (300) of the steel wire drawing die; and the forming section (212) is used to extrude the steel wire so as to reduce the diameter of the steel wire. A wear-resistant layer is provided in the molding section (212), and the wear-resistant layer (220) is smoothly transitionally connected to the assembly section (211).

2. The wire drawing die according to claim 1, characterized in that: The forming section (212) comprises a compression section (2121) and a sizing section (2122); the compression section (2121) and the sizing section (2122) are coaxially connected to the assembly section (211) in sequence; two ends of the compression section (2121) are respectively connected to the assembly section (211) and the sizing section (2122); and the diameter of the sizing section (2122) is smaller than the diameter of the compression section (2121); The wear-resistant layer is arranged in at least one of the compression section (2121) and the sizing section (2122).

3. The wire drawing die according to claim 2, characterized in that: The wear-resistant layer comprises a first wear-resistant layer (220) and a second wear-resistant layer (230); the first wear-resistant layer (220) is arranged in the compression section (2121); the second wear-resistant layer (230) is arranged in the sizing section (2122); and the second wear-resistant layer (230) is smoothly transitionally connected to the first wear-resistant layer (220).

4. The wire drawing die according to claim 2, characterized in that: The compression section (2121) is a tapered diameter-reducing section, the large-diameter end of the diameter-reducing section is connected to the assembly section (211), and the small-diameter end of the diameter-reducing section is connected to the sizing section (2122); The compression angle of the compression section (2121) is greater than or equal to 10.5°, and the compression angle is less than or equal to 11.5°.

5. The wire drawing die according to claim 4, characterized in that: When the diameter of the compression section (2121) is greater than or equal to 3 mm, the length of the compression section (2121) is greater than or equal to 5.5 mm, and the length of the compression section (2121) is less than or equal to 8 mm; When the diameter of the compression section (2121) is less than 3 mm, the length of the compression section (2121) is greater than or equal to 3.0 mm, and the length of the compression section (2121) is less than or equal to 5.5 mm.

6. The wire drawing die according to claim 2, characterized in that: When the mold core (200) is used for intermediate processing, the length of the sizing section (2122) is 0.70 to 0.80 times the diameter of the sizing section (2122); When the mold core (200) is used for finished product processing, the length of the sizing section (2122) is 0.85 to 0.95 times the diameter of the sizing section (2122).

7. The wire drawing die according to any one of claims 1 to 6, characterized in that: The wear-resistant layer is at least one of a nano layer, a hard alloy layer and a diamond layer, and the mold core (200) is a tungsten steel part.

8. The wire drawing die according to any one of claims 1 to 6, characterized in that: The drawing hole (210) further comprises a die flare (213), the small diameter end of the die flare (213) being connected to an end of the forming section (212) away from the assembly section (211), and the large diameter end of the die flare (213) being connected to the end face of the mold core (200).

9. The wire drawing die according to any one of claims 1 to 6, characterized in that: The mold sleeve (100) is provided with a mounting hole (110), the mold core (200) is embedded in the mounting hole (110), and the drawing hole (210) is communicated with the mounting hole (110).

10. A steel wire drawing die, characterized in that: It comprises a pressure die (300) and the wire drawing die according to any one of claims 1 to 9, wherein the pressure die (300) is in abutment with the wire drawing die.

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