CN113070539A

CN113070539A - Electrode wire and preparation method thereof

Info

Publication number: CN113070539A
Application number: CN202110366665.4A
Authority: CN
Inventors: 梁志宁; 万林辉; 吴桐; 林火根; 孟宪旗
Original assignee: Ningbo Bode High Tech Ltd By Share Ltd
Current assignee: Ningbo Bode High Tech Ltd By Share Ltd
Priority date: 2017-12-31
Filing date: 2017-12-31
Publication date: 2021-07-06
Also published as: CN108115237A; WO2019127614A1

Abstract

The invention relates to a wire electrode and a preparation method thereof, wherein the wire electrode comprises a core material and strip-shaped bulges spirally wound on the surface of the core material; the turns of the strip-shaped bulges are arranged at intervals; the core material and the strip-shaped bulges both comprise copper, zinc and impurities; the mass percent content of copper in the core material is 58.5-67.5 wt%, and the mass percent content of impurities in the core material is less than or equal to 0.5 wt%; the mass percentage content of zinc in the strip-shaped bulges is 57.8-69.8 wt%, and the mass percentage content of impurities in the strip-shaped bulges is less than or equal to 0.3 wt%. The strip-shaped bulges are wound on the surface of the core material, so that the cutting efficiency of the electrode wire is improved, the wire breakage rate is reduced, the cutting device is particularly suitable for cutting and processing high-hardness alloy or high-temperature-resistant material which is suspended vertically or has a certain taper, the production process is simple, the operability is strong, the preparation steps are few, the production equipment is simple, products meeting the requirements can be easily prepared, and the large-scale and automatic production can be easily realized.

Description

Electrode wire and preparation method thereof

The application is a divisional application of a patent application named as 'a high-efficiency flushing electrode wire and a preparation method thereof', the application date of the original application is 12 months and 31 days in 2017, and the application number is 201711495027.2.

Technical Field

The invention relates to the field of electrode wires, in particular to an efficient flushing electrode wire and a preparation method thereof.

Background

In recent years, with the rapid development of the manufacturing industry in china, the numerical control low-speed wire cut electrical discharge machining is more and more widely used due to its excellent machining performance. However, the common wire electrode does not perform ideally when processing complex, irregular, suspended or high-thickness workpieces, such as: the nickel-based alloy for the aviation turbine engine, the titanium alloy for manufacturing artificial implants in the medical field, the special high-thickness large gear for heavy-duty loading complete equipment or the special-shaped covering piece punching die in the automobile industry and the like. Such workpieces are generally complex in shape, suspended vertically, large in fall, provided with a certain taper, and made of high-hardness alloy or high-temperature-resistant materials, so that the flushing effect of working liquid is reduced, a large amount of heat is generated during wire cut electrical discharge machining, the heat cannot be taken away by the working liquid in time, the cutting efficiency is reduced, excessive heat is lost on the wire electrode, and the wire electrode is burnt off due to overheating. When the common electrode wire material is used for cutting the special-shaped high-hardness alloy or high-temperature-resistant super alloy material under the complex working condition, the wire is particularly easy to break, and the cutting efficiency is low. Therefore, a wire electrode with low wire breakage frequency and high cutting efficiency and a preparation method thereof are needed.

Disclosure of Invention

The invention aims to provide a wire electrode and a preparation method thereof, which improve the cutting efficiency and reduce the wire breakage frequency by improving the structure and the material content of the wire electrode, and meanwhile, the production process of the wire electrode preparation method is simple and has strong operability.

In order to achieve the purpose, the invention provides an electrode wire, which comprises a core material and strip-shaped bulges spirally wound on the surface of the core material; the turns of the strip-shaped bulges are arranged at intervals;

the number N of the strip-shaped bulges is 1 or 2 or 3 or 4;

the cross section of the strip-shaped bulge is trapezoidal, triangular or zigzag;

the core material and the strip-shaped bulges respectively comprise copper, zinc and impurities;

wherein the mass percent content of copper in the core material is 58.5-67.5 wt%, and the mass percent content of impurities in the core material is less than or equal to 0.5 wt%;

the mass percentage content of zinc in the strip-shaped protrusions is 57.8-69.8 wt%, and the mass percentage content of impurities in the strip-shaped protrusions is less than or equal to 0.3 wt%.

The invention also provides a preparation method of the electrode wire, which comprises the following steps:

(1) preparing a bus required by the core material, wherein the diameter of the bus is 0.5-1.2 mm;

(2) carrying out oil removal, acid pickling, water washing and zinc plating treatment on the prepared bus to obtain a first wire blank, wherein the thickness of a zinc plating layer is 3-15 mu m, the electroplating current is 1200-2500A, and the voltage is 120-220V;

(3) carrying out alloying heat treatment on the first wire blank at 290-350 ℃ for 3-8 h, and forming a strip-shaped protruding material on the surface of the core material to obtain a second wire blank;

(4) performing contact type online diffusion annealing treatment on the second wire blank to form a protruding edge material between the core material and the strip-shaped protrusions, so as to prepare a third wire blank, wherein the processing speed is 10-20 m/min, the annealing current is 25-100A, and the voltage is 50-180V;

(5) and carrying out rotary continuous drawing and continuous annealing processing on the third wire blank by adopting a special-shaped die, wherein the drawing speed is 800-1200 m/min, the annealing voltage is 12-60V, and the annealing current is 15-50A, so that a finished electrode wire product with the diameter of 0.15-0.30 mm is prepared.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the invention provides a wire electrode and a preparation method thereof, wherein the wire electrode comprises a core material and strip-shaped bulges spirally wound on the surface of the core material; the turns of the strip-shaped bulges are arranged at intervals. The strip-shaped bulges are convexly arranged on the surface of the core material, so that the surface area of the electrode wire can be obviously increased, the heat dissipated by the electrode wire per se in unit time is obviously increased, the electrode wire is prevented from being burnt out due to overheating caused by excessive heat loss of the electrode wire, and the wire breakage frequency is reduced. In addition, more fresh working solution can be effectively injected through the spirally wound strip-shaped protruding structure, so that the surfaces of the workpiece and the electrode wire are cooled in time, and the surface of the workpiece is prevented from being burnt or the electrode wire is prevented from being damaged, and the wire burning is caused in serious cases. After the discharge is finished, the strip-shaped protruding structure can store a large amount of corrosion removal products, and machining chips are reduced from adhering to the surface of the electrode wire, so that the chip removal performance is improved, the wire breakage probability is reduced, and the cutting efficiency is improved.

In addition, the mass percent content of copper in the core material is 58.5-67.5 wt%, and the mass percent content of impurities in the core material is less than or equal to 0.5 wt%, so that the core material has good tensile strength and enough plastic toughness, and the electrode wire has larger tension and better plastic toughness, and further has better cutting performance and is not easy to break. The mass percent of zinc in the strip-shaped protrusions is 57.8-69.8 wt%, and the mass percent of impurities in the strip-shaped protrusions is less than or equal to 0.3 wt%, so that the gasification performance of the electrode wire is good, and the cutting efficiency is improved.

In conclusion, the electrode wire has high cutting efficiency, and is particularly suitable for cutting and processing high-hardness alloy or high-temperature-resistant materials which are suspended vertically or have certain conicity. The preparation method disclosed by the invention is simple in production process, strong in operability, few in preparation steps, simple in production equipment, easy to prepare products meeting the requirements, and easy to realize large-scale and automatic production.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structure diagram of a wire electrode with strip-shaped protrusions continuously distributed according to embodiment 1 of the present invention;

fig. 2 is a structural view of a wire electrode with discontinuous distribution of strip-shaped protrusions according to embodiment 1 of the present invention;

FIG. 3 is a partially enlarged view of a wire electrode provided in embodiment 1 of the present invention;

fig. 4 is a flowchart of a method for manufacturing a wire electrode according to embodiment 2 of the present invention;

fig. 5 is a schematic view of a manufacturing process of a wire electrode with discontinuous distribution of strip-shaped protrusions according to embodiment 2 of the present invention;

FIG. 6 is a micrograph of a wire electrode with a plurality of protrusions continuously distributed according to example 2 of the present invention;

fig. 7 is a micrograph of a wire electrode with discontinuous distribution of strip-shaped protrusions provided in example 2 of the present invention.

Description of the symbols:

1: a core material; 2: strip-shaped bulges; 21: a convex section.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example 1

As shown in fig. 1, the present embodiment provides a wire electrode, which includes a core material and a strip-shaped protrusion spirally wound on the surface of the core material; the turns of the strip-shaped bulges are arranged at intervals;

the core material and the strip-shaped bulges respectively comprise copper, zinc and impurities; wherein the mass percent content of copper in the core material is 58.5-67.5 wt%, and the mass percent content of impurities in the core material is less than or equal to 0.5 wt%;

the copper content is selected, and the core material with the copper content of 58.5-67.5 wt% is mainly considered, so that the composite material has good tensile strength and enough ductility and toughness. Because the electrode wire must bear certain tension and impact force caused by discharge in the electric spark discharge machining process, if the material strength is too low or the fracture toughness is too low, the electrode wire can shake, and finally the surface of a cut workpiece is rough and uneven, and even a plurality of cutting line marks can be caused.

In order to further improve the performance of the electrode wire, the copper content can be more accurately determined to be 61.5-64.5 wt%, the copper content of 61.5-64.5 wt% is also beneficial to restoring the straightness of the electrode wire, wire threading is facilitated, and the electrode wire material with good toughness is also beneficial to taper cutting processing.

The strip-shaped bulges with the zinc content of 57.8-69.8 wt% are selected, and the gasification performance is very good, so that the cutting efficiency is particularly improved. Because the zinc content in the strip-shaped bulges is relatively high, a large amount of gasified zinc can bring energy generated by discharging in cutting to the surface of the cut metal, the flushing effect is improved, meanwhile, air pressure generated by zinc gasification can blow away corrosion generated by discharging, a better environment is created for next pulse discharging, and the processing speed is facilitated. Therefore, the higher the zinc content of the strip-shaped protrusions is, the better the cutting effect is, but if the zinc content is too high, the melting point is lower, the vaporization enthalpy is reduced, and the processing efficiency is not improved. The above-mentioned zinc content is the optimum range.

In order to improve the cutting performance of the electrode wire by the strip-shaped protrusions, the structure of the strip-shaped protrusions needs to be further limited:

firstly, the strip-shaped bulges are selected to be spirally wound on the surface of the core material, a plurality of turns are formed in the spiral winding process, and in order to make the protruding effect of the strip-shaped bulges more obvious and to be more beneficial to cutting, a mode of arranging the turns of the strip-shaped bulges at intervals is required.

The premise of stable cutting of the wire cut electrical discharge machining is that the wire is not broken in the cutting process, and the wire breakage probability is mainly related to the heat dissipation performance, the cooling state, the chip removal performance and the like of the wire electrode. The strip-shaped protruding structure provided by the invention can obviously increase the surface area of the wire material, so that the heat dissipated by the electrode wire per se can be obviously increased in unit time, and the electrode wire is prevented from being burnt out due to overheating because of excessive heat loss on the electrode wire. When the work piece is suspended from top to bottom and the flushing pressure of the working solution is insufficient, the surface of the cut work piece after cutting is covered with adhesive and even powdery corrosion removal products, which is mainly formed by decomposing a working medium to generate a large amount of high molecular compounds along with the high temperature of more than 10000 ℃ in a discharge channel and reacting with the metal corrosion removal products to generate colloidal or granular substances. These substances will adhere to the slit and accumulate mainly at the slit outlet, seriously affecting the removal of galvanic corrosion products and making it difficult for fresh working medium to enter the slit.

The electrode wire provided by the invention moves along with the discharge machining of the electrode wire, and particularly, a spiral type protruding structure can effectively inject more fresh working solution, so that the surfaces of a workpiece and the electrode wire are cooled in time, and the surface of the workpiece is prevented from burning or damaging the electrode wire, and the wire burning is caused in serious cases. After the discharge is finished, the spiral strip-shaped protruding structure of the electrode wire can store a large amount of corrosion removal products, and machining chips are reduced from adhering to the surface of the electrode wire, so that the chip removal performance is improved, and the wire breakage probability is reduced. Since the adhesion acts to concentrate the discharge on the wire electrode, it is likely that the temperature will rise if the cooling conditions are poor, and thus there may be other machining chips adhered to the vicinity of the point in the continuous discharge, which causes a vicious circle and finally causes burning or even breakage of the wire.

In addition, the spiral linear strip-shaped bulges are coiled around the surface of the core material, so that the spiral linear strip-shaped bulges have good flow guiding effect and self-flushing effect on working liquid from top to bottom, and the working liquid falls spirally along the surface of the wire electrode, so that a smooth liquid column is formed in the wire traveling process, the self-flushing capability is improved, the surface pressure of the wire electrode is reduced, the cooling capability is enhanced, the wire electrode is prevented from being burnt off due to overhigh temperature, the cutting safety coefficient is improved, and the wire breakage frequency is reduced. Meanwhile, the spiral linear strip-shaped bulges enable working liquid to flow in along the tangential direction, so that the working liquid is prevented from colliding with the surface of the wire electrode, the liquid is ensured to fall in a rotating manner, a relatively dense rotating water flow is formed, a large amount of heat generated during wire cut electrical discharge is greatly absorbed, and wire breakage is prevented. In the numerical control low-speed wire cut electrical discharge machining process, all adopt high pressure to wash by water usually, because the speed of rivers is very fast, do not have any to alleviate, consequently can cause great energy loss in cutting process, be unfavorable for very much promoting cutting efficiency, this kind of spiral threadlike strip is protruding not only to make the high pressure that flows through the wire electrode surface wash by water and be difficult to take place to block, can also let the speed of washing by water more stabilize, avoids discharging energy to scatter and disappear too early, is favorable to promoting cutting efficiency.

As an alternative embodiment, the strip-shaped protrusion may be composed of a plurality of protrusion segments, and each protrusion segment is closely connected or spaced. When the convex sections are tightly connected to form a whole, the strip-shaped bulges are continuously distributed and wound on the surface of the core material; when the convex sections are arranged at intervals, the strip-shaped protrusions are discontinuously distributed on the surface of the core material. As shown in fig. 1, the strip-shaped protrusions are spirally distributed on the surface of the core material and continuously distributed along the length direction thereof; as shown in fig. 2, the protrusions are discontinuously arranged along the length direction thereof.

According to actual requirements or considering the thickness arrangement of the strip-shaped protrusions, a plurality of strip-shaped protrusions can be arranged on the surface of the core material, and generally 1 to 4 strip-shaped protrusions are selected and arranged. When a plurality of strip-shaped bulges are arranged, other strip-shaped bulges are generally wound between the intervals of the turns of the same strip-shaped bulge, and a certain interval is required to be arranged between the turns of different strip-shaped bulges.

Regarding how the distance of the strip-shaped protrusions protruding out of the core material is set, considering the influence of the strip-shaped protrusions on the cutting performance of the electrode wire, fig. 3 shows a partial enlarged view of a part I of the electrode wire, and the radial distance L between the strip-shaped protrusions and the surface of the core material is 4-20 μm in the embodiment.

For the case that the strip-shaped protrusions are discontinuously distributed on the surface of the core material, the spacing distance between the protrusion sections in the strip-shaped protrusions also affects the cutting efficiency of the wire electrode, and also affects the wire breakage rate of the wire electrode, so to avoid the above-mentioned effects, in this embodiment, it is required that, in the same strip-shaped protrusion, the axial distance from one side of the protrusion section in any turn to the same side of the protrusion section in an adjacent turn is NP, and P is 2 to 80 μm.

In order to improve the cutting performance of the electrode wire by the strip-shaped bulges, the bulge sections in the strip-shaped bulges can be required to be uniformly distributed, so that the bulge sections in adjacent turns of the strip-shaped bulges can be arranged in a one-to-one correspondence manner, the strip-shaped bulges are structurally neat, and the cutting effect of the electrode wire is more uniform.

The cross section of the strip-shaped protrusion is one of trapezoid, rectangle, triangle or sawtooth. And the included angle alpha formed between the convex section in any turn and the corresponding convex section in the adjacent turn is 0-60 degrees. Wherein, establish triangle-shaped or trapezoidal or zigzag with the bellied cross section of strip, the clearance space between the bellied adjacent circle of strip under the main consideration of this structure is big, can save more erosion-removal thing to when washing the erosion-removal thing, the clearance space can bear more working liquids greatly, can produce bigger punching press when utilizing the working liquid to wash, then the washing effect is then better, further makes the erosion-removal thing be difficult for blockking up, thereby avoids appearing disconnected silk phenomenon. In addition, when the cross section is triangular, trapezoidal or zigzag, an acute-angle tip can be generated, and in the machining process, the acute-angle tip is easy to discharge, namely, the tip discharge is generated, so that the material cutting can be accelerated and the cutting efficiency is improved when the low-speed wire-cut electrical discharge wire cutting machining is carried out. Moreover, when the cross section is triangular, trapezoidal or zigzag, the protruding part uses less materials compared with the rectangular shape, so that the manufacturing cost can be saved, the energy consumption in the production process can be reduced, and the energy is saved.

The strip-shaped bulges are wound on the surface of the core material, the strip-shaped bulges and the core material are independent, and the joint between the strip-shaped bulges and the core material can also influence the overall cutting efficiency of the electrode wire, so that the embodiment requires that the joint of the bottom edges of the strip-shaped bulges and the core material forms a bulge edge. The bottom edge material of the strip-shaped protrusion diffuses into the core material, so that the protrusion edge comprises copper, zinc and impurities; according to a copper-zinc binary phase diagram, the strip-shaped protrusions with the zinc content of 57.8-69.8 wt% have a gamma-phase structure, and because the gamma-phase structure is hard and brittle and has poor processability, the bonding force between the strip-shaped protrusions and a core material can be increased by arranging the edges of the protrusions, and powder falling caused by falling of the protrusions is effectively avoided. In addition, the bulge edge with the zinc content of 43.5-53.5 wt% has a beta phase structure, the phase structure is good in conductivity, and discharge energy can be effectively transmitted, so that the discharge cutting efficiency is improved. And the content of impurities in the raised edge is less than or equal to 0.12wt percent. In addition, it is also required that the maximum dimension S of the raised edge in the radial direction is 1.5-8 μm.

Example 2

Referring to fig. 4, the present embodiment provides a method for manufacturing a wire electrode, including:

In order to enable those skilled in the art to more intuitively understand the specific manufacturing process of the electrode wire, the manufacturing process of the electrode wire in which the strip-shaped protrusions are discontinuously distributed on the surface of the core material is more intuitively described with reference to fig. 5.

As shown in FIG. 5-A, a copper-zinc alloy required for preparing the core material is taken and processed into a bus with a diameter of 0.5-1.2 mm by drawing;

as shown in fig. 5-B, the bus bar is subjected to degreasing, pickling, washing with water, and galvanizing treatment to obtain a first wire blank with a galvanizing layer having a thickness of 3-15 um, wherein the electroplating current is 1200-2500A and the voltage is 120-220V.

As shown in fig. 5-C, the first wire blank obtained above is subjected to alloying heat treatment at 290-350 ℃ for 3-8 hours to form a protrusion material on the surface of the core material, and a second wire blank is obtained.

And as shown in fig. 5-D, performing contact type on-line diffusion annealing treatment on the second wire blank to form the material of the protrusion edge between the core material and the protrusion, thereby obtaining a third wire blank, wherein the processing speed is 10-20 m/min, the annealing current is 25-100A, and the voltage is 50-180V.

And (5) as shown in the figure 5-E, carrying out rotary continuous drawing and continuous annealing processing on the prepared third wire blank by adopting a special-shaped die, wherein the drawing speed is 800-1200 m/min, the annealing voltage is 12-60V, the annealing current is 15-50A, and a finished wire electrode product with the diameter of 0.15-0.30 mm is prepared, and the figure 5-E is a cross-sectional view of the figure 2. In addition, fig. 6 and 7 show micrographs (continuous distribution and discontinuous distribution of the linear protrusions) of the finished wire electrode, and continuous or discontinuous linear protrusions are formed on the surface of the core material of the finished wire electrode.

The following provides 12 cases of electrode wires prepared by the method of the present embodiment, and please refer to tables 1, 2 and 3 for differences among the cases; meanwhile, 8 comparative examples are also set;

comparative example 1: a commercially available H62 brass wire electrode having a diameter of 0.25 mm.

Comparative example 2: a galvanized wire electrode is characterized in that a core material is composed of H63 brass with the diameter of 0.9-1.2 mm, the surface of the core material is directly galvanized, the thickness of a coating is 10-20 microns, and then continuous drawing and continuous annealing processing are carried out to prepare the galvanized wire electrode with the diameter of 0.25 mm.

Comparative example 3: a high-speed wire electrode is characterized in that a core material is composed of H60 brass with the diameter of 0.9-1.2 mm, then the surface of the core material is galvanized, the thickness of a coating is 10-30 microns, a first wire blank is obtained, the first wire blank is subjected to heat treatment, the temperature of the heat treatment process is 410 ℃, the time is 10 hours, a second wire blank is obtained, finally, continuous drawing and continuous annealing processing are carried out on the second wire blank after heat treatment, the high-speed wire electrode with the diameter of 0.25mm is manufactured, and the surface layer structure is gamma phase.

Comparative example 4: a high-speed wire electrode is characterized in that a core material is composed of H63 brass with the diameter of 0.9-1.2 mm, then the surface of the core material is galvanized, the thickness of a coating is 10-30 microns, a first wire blank is obtained, the first wire blank is subjected to heat treatment, the temperature of the heat treatment process is 550 ℃, the time is 20 hours, a second wire blank is obtained, finally, continuous drawing and continuous annealing processing are carried out on the second wire blank after heat treatment, the high-speed wire electrode with the diameter of 0.25mm is manufactured, and the surface layer structure is beta phase.

Comparative examples 5 to 8: the preparation method was the same as in this example. The specific element contents, the stripe-like convex characteristics and the performances of the wire electrodes of comparative examples 1 to 8 are shown in tables 1, 2 and 3.

TABLE 1 table of contents of elements in wire electrodes in cases 1 to 12 and comparative examples 1 to 8

TABLE 2 Table of characteristics of the striped projections in cases 1-12 and comparative examples 1-8

TABLE 3 tables of Performance data of the wire electrodes in cases 1 to 12 and comparative examples 1 to 8

It should be noted that: the data in table 3 are obtained by testing under the same conditions, wherein the diameter of the wire electrode is 0.25mm, and of course, the person skilled in the art can effectively adjust the continuous drawing and continuous annealing processing conditions for the first wire blank and the heat treatment conditions for the second wire blank in each embodiment, so that the diameter of the finished wire electrode in each case varies within the range of 0.15-0.30 mm. The cutting efficiency of comparative example 1 was used as a reference, and the cutting efficiencies and ratios thereof of cases 1 to 12 and comparative examples 2 to 8 were used as performance parameters for representing the cutting efficiencies.

As can be seen from the performance tests of the cases, compared with the electrode wire in the comparative example, the electrode wire in the invention can effectively reduce the wire breakage probability and improve the cutting efficiency on the basis of ensuring the physical performance of the electrode wire.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The electrode wire is characterized by comprising a core material and strip-shaped bulges spirally wound on the surface of the core material; the turns of the strip-shaped bulges are arranged at intervals;

the number N of the strip-shaped bulges is 1 or 2 or 3 or 4;

2. The wire electrode according to claim 1, wherein the core material contains copper in an amount of 61.5 to 64.5 wt%.

3. The wire electrode according to claim 1, wherein the strip-shaped protrusion is composed of a plurality of protrusion sections, and the protrusion sections are closely connected or spaced.

4. The wire electrode according to claim 1, wherein in the same strip-shaped protrusion, the axial distance from one side of the protrusion section in any turn to the same side of the protrusion section in the adjacent turn is NP, and P is 2-80 μm.

5. The wire electrode according to claim 1, wherein the turns of the different strip-shaped protrusions are spaced apart.

6. The wire electrode according to claim 1, wherein a radial distance between the strip-shaped protrusions and the surface of the core material is 4-20 μm.

7. The wire electrode according to claim 1, wherein the joint of the bottom edge of the strip-shaped protrusion and the core material forms a protrusion edge, and the maximum dimension of the protrusion edge in the radial direction is 1.5-8 μm.

8. The wire electrode of claim 7, the raised edges comprising copper, zinc, and impurities; wherein the mass percent content of copper in the raised edge is 43.5-53.5 wt%, and the mass percent content of impurities in the raised edge is less than or equal to 0.12 wt%.

9. A method of manufacturing a wire electrode according to any one of claims 1 to 8, comprising the steps of: