CN115401275A - Composite electrode wire and preparation method thereof - Google Patents
Composite electrode wire and preparation method thereof Download PDFInfo
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- CN115401275A CN115401275A CN202211071651.0A CN202211071651A CN115401275A CN 115401275 A CN115401275 A CN 115401275A CN 202211071651 A CN202211071651 A CN 202211071651A CN 115401275 A CN115401275 A CN 115401275A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/04—Electrodes specially adapted therefor or their manufacture
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Abstract
The invention belongs to the technical field of slow wire-moving discharge machining, and particularly relates to a composite electrode wire and a preparation method thereof. The method comprises the steps of manufacturing the superplastic zinc-manganese alloy by an up-drawing continuous casting and continuous extrusion method, then coating the superplastic zinc-manganese alloy serving as a surface layer on the surface of a brass core material by a continuous extrusion coating method, and then carrying out wire drawing and annealing treatment to process to a target specification so as to form the composite electrode wire on the core material and the surface layer. The continuous extrusion coating method solves the problem that the existing galvanized wire process pollutes the environment, the superplastic zinc-manganese alloy has excellent processing performance, and the problem that the later processing is difficult to reach the specification of less than 0.1mm is solved.
Description
Technical Field
The invention belongs to the technical field of slow wire-moving discharge machining, and particularly relates to a composite electrode wire and a preparation method thereof.
Background
The slow wire-moving discharge machining is to use a continuously moving electrode wire as an electrode to perform pulse spark discharge to remove metal from a workpiece, and finally, the workpiece is machined and formed according to a set track. The galvanized wire is one of electrode wires for slow wire electric discharge machining, and zinc is covered on the surface of a core material by an electroplating or hot-dip plating method. The purpose is to utilize the gasification of zinc in the discharge process, to stabilize the discharge of the electrode wire, and achieve the effects of high cutting efficiency, high surface smoothness of the cut workpiece and high dimensional accuracy. However, the electrode wire has the problems of serious pollution in the processing process and difficulty in processing to a thinner specification.
The invention patent with the patent application number of CN113909599A discloses a manufacturing method of a galvanized wire electrode. The manufacturing method comprises the steps of fusion casting, giant drawing, annealing, large drawing, medium drawing, electroplating and small drawing. The electroplating process comprises the steps of sequentially carrying out alkali electrolysis, primary water washing, acid electrolysis, secondary water washing, continuous zinc electroplating twice, drying and wire winding on a brass wire blank (namely a core material). The galvanized wire electrode produced by the process can further improve the cutting efficiency, the size precision of the workpiece and the surface smoothness.
The method for manufacturing the galvanized wire electrode disclosed in the patent covers zinc on the surface of a core material by using an electroplating method, so that the method is serious in environmental pollution, and meanwhile, the zinc has a hexagonal close-packed crystal structure, so that the processing is difficult, and the processing to be below the specification of 0.1mm is difficult in the later stage.
The patent application number CN113823435A discloses a composite electrode wire, a preparation method of the composite electrode wire and application of the composite electrode wire. According to the method, a brass tubular outer material is directly sleeved outside a conductive alloy core material, then pressure cold packing is carried out, the conductive alloy core material and the brass outer material are directly and concentrically coated into a whole, then drawing, annealing and wire drawing are carried out, the core material and the outer material form a final composite electrode wire, a zinc material coating can be sprayed on the surface of the composite electrode wire, and the technical problems that the surface of the existing composite electrode wire is not glossy and the overall strength is low are solved.
The patent discloses a composite electrode wire, a preparation method and application of the composite electrode wire. The process solves the problems of non-gloss surface and low overall strength of the wire electrode, and does not solve the problems of environmental pollution and difficult processing of the galvanized wire process.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of a composite electrode wire, which comprises the following steps:
s1: mixing metal zinc and metal manganese, smelting, and carrying out up-drawing continuous casting to obtain a zinc-manganese alloy up-drawing rod;
s2: continuously extruding the zinc-manganese alloy upper guide rod to obtain a zinc-manganese alloy extrusion rod; the continuous extrusion times are 5-10, the deformation of each extrusion is 0-99%, and the deformation of the first extrusion is more than 80%;
s3: taking a brass rod as an inner core and two zinc-manganese alloy extrusion rods as outer surface layers, and extruding and coating to obtain a composite material; the ratio of the cross section area of the brass rod to the cross section area of the composite material is 1:1.01-1.10;
the sum of the sectional areas of the two zinc-manganese alloy extrusion rods is larger than the sectional area of the brass rod;
s4: carrying out wire drawing and annealing on the composite material to obtain the composite electrode wire;
in the zinc-manganese alloy upper guide rod, the mass fraction of zinc is 99.00-99.99%.
Preferably, in the step S1, the melting temperature is 600-700 ℃.
Preferably, in the step S1, the speed of the upward continuous casting is 0.5-1.5m/min.
Preferably, in the step S1, an antioxidant is coated after the up-casting and the continuous casting; the antioxidant comprises amino acid salt of methylbenzotriazole and water.
The antioxidant is purchased from Suzhou Yueyuee electromechanical equipment automation company, and the structural formula of the amino acid salt of the methylbenzotriazole is as follows:
wherein R is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl or tert-butyl.
Further, the mass ratio of the amino acid salt of the methylbenzotriazole to the water is 1:10-100.
Preferably, in the step S2, the temperature of the continuous extrusion is 200 to 300 ℃.
Preferably, in the step S2, the rotation speed of the extrusion wheel for continuous extrusion is 0.1-5rpm.
Preferably, in the step S3, a continuous extrusion coating machine is used for extrusion coating, and the coating speed is 10-200m/min.
Furthermore, the distance between a coating module and a guide die of the continuous extrusion coating machine is 6-7mm, and the gap between the guide die is 0.6-1.8mm.
Preferably, the brass rod has a copper content of 60 to 65wt%, and the balance of Zn and other unavoidable impurities.
Preferably, the cross-sectional area of the brass rod is less than the sum of the cross-sectional areas of the two zinc-manganese alloy extrusion rods.
Preferably, in the step S4, a continuous annealing wire drawing machine is adopted for wire drawing and annealing, the annealing voltage is 30-40V, and the drawing speed is 300-1000m/min.
Further, the composite material is sequentially pulled to a target specification through a large-pulling continuous annealing machine, a medium-pulling continuous annealing machine, a small-pulling continuous annealing machine and a micro-pulling continuous annealing machine.
The invention also provides the composite wire electrode prepared by the preparation method, and the wire electrode can be used in the field of slow wire-moving discharge machining.
The method comprises the steps of manufacturing a superplastic zinc-manganese alloy by an up-drawing continuous casting and continuous extrusion method, then coating the superplastic zinc-manganese alloy serving as a surface layer on the surface of a brass core material by a continuous extrusion coating method, and then carrying out wire drawing and annealing treatment to process the brass core material to a target specification so as to form a composite wire electrode on the core material and the surface layer. The continuous extrusion coating method solves the problem that the existing galvanized wire process pollutes the environment, the superplastic zinc-manganese alloy has excellent processing performance, and the problem that the later processing is difficult to reach the specification of less than 0.1mm is solved.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The invention does not have the plating process, and has no pollution to the environment;
(2) The zinc-manganese alloy on the surface layer has fine crystal grains after being processed by a special process, has the average grain size of below 1 mu m, has superplasticity, has better processing performance compared with pure zinc, is beneficial to processing the integral composite material to the diameter of below 0.1mm, and expands the application of the zinc-manganese alloy in the field of slow wire-moving discharge processing;
(3) The tensile strength of the composite material is more than 900MPa, the electric conductivity is more than 19 percent IACS, and the composite material can reach the performance of common galvanized wires under the same specification.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the examples are not intended to limit the present invention.
Example 1
The embodiment of the invention provides a composite wire electrode, which comprises: a core material and a surface layer;
the core material is common brass;
the surface layer is made of superplastic zinc-manganese alloy;
the preparation method for preparing the composite electrode wire comprises the following steps:
(1) The preparation of the superplastic zinc-manganese alloy extrusion rod required by the surface layer comprises the following steps:
a. upward continuous casting: putting 99.1% of zinc and 0.9% of manganese by weight into an upward continuous casting furnace, smelting at 600 ℃, casting a zinc-manganese alloy upward guide rod with the diameter of 14mm at a traction speed of 0.5m/min, and coating an antioxidant on the surface when taking up, wherein the ratio of the antioxidant to water is 1:10;
b. continuous extrusion: continuously extruding the zinc-manganese alloy upper guide rod with the diameter of 14mm for 10 times, wherein the preheating temperature of a die cavity is 200 ℃, the rotating speed of an extrusion wheel is 0.1rpm, the diameter is 6mm after the first extrusion, the diameter is 8mm after the second extrusion, the diameter is 6mm after the third extrusion, extruding for the fourth time to 8mm in diameter, extruding for the fifth time to 6mm in diameter, extruding for the sixth time to 8mm, extruding for the seventh time to 6mm, extruding for the eighth time to 8mm, extruding for the ninth time to 6mm, and extruding for the tenth time to 6mm;
(2) Preparing a common brass rod required by a core material, and removing dust and grease on the surface, wherein the diameter of the brass rod is 7.4mm, the copper content is 60wt%, and the balance is zinc and inevitable impurities;
(3) Continuous extrusion coating: forming a composite material with the diameter of 7.5mm by using a common brass rod with the diameter of 7.4mm as a core material and two zinc-manganese alloy extrusion rods with the diameter of 6mm as surface layers through a continuous extrusion coating machine, wherein the coating speed is 10m/min, the distance between a coating module and a guide die is 6mm, and the gap between the guide die is 1.8mm;
(4) Wire drawing and annealing: passing the composite material with the diameter of 7.5mm through a large drawing continuous annealing machine to obtain the composite material with the diameter of 3mm, wherein the drawing speed is 300m/min, and the annealing voltage is 40V; then obtaining a composite material with the diameter of 1.2mm by a middle-drawing continuous annealing machine, wherein the drawing speed is 500m/min, and the annealing voltage is 37V; then, a finished product with the diameter of 0.3mm is obtained by a small-drawing continuous annealing machine, the drawing speed is 900m/min, and the annealing voltage is 34V.
Example 2
The embodiment of the invention provides a composite wire electrode, which comprises: a core material and a surface layer;
the core material is common brass;
the surface layer is made of superplastic zinc-manganese alloy;
the preparation method for preparing the composite electrode wire comprises the following steps:
(1) A zinc-manganese alloy extrusion rod with superplasticity required for preparing a surface layer comprises the following steps:
a. upward continuous casting: putting 99.3% of zinc and 0.7% of manganese by weight into an upward continuous casting furnace, smelting at 620 ℃, then casting a zinc-manganese alloy upward guide rod with the diameter of 16mm at a traction speed of 0.7m/min, and coating an antioxidant on the surface when taking up, wherein the ratio of the antioxidant to water is 1:30, of a nitrogen-containing gas;
b. continuous extrusion: continuously extruding the zinc-manganese alloy upper guide rod with the diameter of 16mm for 8 times, wherein the preheating temperature of a die cavity is 230 ℃, the rotating speed of an extrusion wheel is 1rpm, the diameter is 7mm after the first extrusion, the diameter is 5.5mm after the second extrusion, extruding for the third time to 7mm in diameter, extruding for the fourth time to 5.5mm in diameter, extruding for the fifth time to 7mm in diameter, extruding for the sixth time to 5.5mm in diameter, extruding for the seventh time to 7mm in diameter, and extruding for the eight times to 5.5mm in diameter;
(2) Preparing a common brass rod required by the core material, and removing dust and grease on the surface, wherein the diameter of the brass rod is 7.35mm, the copper content is 62wt%, and the balance is zinc and inevitable impurities;
(3) Continuous extrusion coating: forming a composite material with the diameter of 7.5mm by using a common brass rod with the diameter of 7.35mm as a core material and two zinc-manganese alloy extrusion rods with the diameter of 5.5mm as surface layers through a continuous extrusion coating machine, wherein the coating speed is 30m/min, the distance between a coating module and a guide die is 6.3mm, and the gap between the guide die is 1.6mm;
(4) Wire drawing and annealing: enabling the composite material with the diameter of 7.5mm to pass through a large-drawing continuous annealing machine to obtain the composite material with the diameter of 3mm, wherein the drawing speed is 350m/min, and the annealing voltage is 39V; then obtaining a composite material with the diameter of 1.2mm by a middle-drawing continuous annealing machine, wherein the drawing speed is 550m/min, and the annealing voltage is 36V; then, a finished product with the diameter of 0.25mm is obtained by a small-drawing continuous annealing machine, the drawing speed is 950m/min, and the annealing voltage is 33V.
Example 3
The embodiment of the invention provides a composite wire electrode, which comprises: a core material and a surface layer;
the core material is common brass;
the surface layer is made of superplastic zinc-manganese alloy;
the preparation method for preparing the composite electrode wire comprises the following steps of:
(1) A zinc-manganese alloy extrusion rod with superplasticity required for preparing a surface layer comprises the following steps:
a. upward continuous casting: putting 99.5% of zinc and 0.5% of manganese by weight into an upward continuous casting furnace, smelting at 640 ℃, then casting a zinc-manganese alloy upward guide rod with the diameter of 18mm at a drawing speed of 0.9m/min, coating an antioxidant on the surface when taking up the wire, wherein the ratio of the antioxidant to water is 1:50;
b. continuous extrusion: continuously extruding the zinc-manganese alloy upper guide rod with the diameter of 18mm for 6 times, wherein the preheating temperature of a die cavity is 250 ℃, the rotating speed of an extrusion wheel is 3rpm, the diameter of the zinc-manganese alloy upper guide rod is extruded for the first time to 8mm, extruding for the second time to 7.5mm in diameter, extruding for the third time to 7mm in diameter, extruding for the fourth time to 6.5mm in diameter, extruding for the fifth time to 6mm in diameter, and extruding for the sixth time to 5.5mm in diameter;
(2) Preparing a common brass rod required by the core material, and removing dust and grease on the surface, wherein the diameter of the brass rod is 7.3mm, the copper content is 63wt%, and the balance is zinc and inevitable impurities;
(3) Continuous extrusion coating: forming a composite material with the diameter of 7.5mm by using a common brass rod with the diameter of 7.3mm as a core material and two zinc-manganese alloy extrusion rods with the diameter of 5.5mm as surface layers through a continuous extrusion coating machine, wherein the coating speed is 70m/min, the distance between a coating module and a guide die is 6.6mm, and the gap between the guide die is 1.2mm;
(4) Wire drawing and annealing: passing the composite material with the diameter of 7.5mm through a large drawing continuous annealing machine to obtain the composite material with the diameter of 3mm, wherein the drawing speed is 400m/min, and the annealing voltage is 38V; then obtaining a composite material with the diameter of 1.2mm by a middle-drawing continuous annealing machine, wherein the drawing speed is 600m/min, and the annealing voltage is 35V; then, a finished product with the diameter of 0.2mm is obtained by a small-drawing continuous annealing machine, the drawing speed is 1000m/min, and the annealing voltage is 33V.
Example 4
The embodiment of the invention provides a composite wire electrode, which comprises: a core material and a surface layer;
the core material is common brass;
the surface layer is made of superplastic zinc-manganese alloy;
the preparation method for preparing the composite electrode wire comprises the following steps of:
(1) A zinc-manganese alloy extrusion rod with superplasticity required for preparing a surface layer comprises the following steps:
a. upward continuous casting: putting 99.7 wt% of zinc and 0.3 wt% of manganese into an upward continuous casting furnace, smelting at 660 ℃, casting a zinc-manganese alloy upward guide rod with the diameter of 20mm at a traction speed of 1.1m/min, coating an antioxidant on the surface when taking up the wire, wherein the ratio of the antioxidant to water is 1:70;
b. continuous extrusion: continuously extruding the zinc-manganese alloy upper guide rod with the diameter of 20mm for 6 times, wherein the preheating temperature of a die cavity is 270 ℃, the rotating speed of an extrusion wheel is 4rpm, the diameter is 8.5mm after the first extrusion, the diameter is 8mm after the second extrusion, the diameter is 7.5mm after the third extrusion, the diameter is 7mm after the fourth extrusion, the diameter is 6.5mm after the fifth extrusion, and the diameter is 6mm after the sixth extrusion;
(2) Preparing a common brass rod required by the core material, and removing dust and grease on the surface, wherein the diameter of the brass rod is 7.25mm, the copper content is 65wt%, and the balance is zinc and inevitable impurities;
(3) Continuous extrusion coating: forming a composite material with the diameter of 7.5mm by using a common brass rod with the diameter of 7.25mm as a core material and two zinc-manganese alloy extrusion rods with the diameter of 6mm as a surface layer through a continuous extrusion coating machine, wherein the coating speed is 100m/min, the distance between a coating module and a guide die is 6.8mm, and the gap between the guide die is 1.0mm;
(4) Wire drawing and annealing: passing the composite material with the diameter of 7.5mm through a large drawing continuous annealing machine to obtain the composite material with the diameter of 3mm, wherein the drawing speed is 450m/min, and the annealing voltage is 37V; then obtaining a composite material with the diameter of 1.2mm by a middle-drawing continuous annealing machine, wherein the drawing speed is 650m/min, and the annealing voltage is 35V; then a composite material with the diameter of 0.5mm is obtained through a micro-drawing continuous annealing machine, the drawing speed is 850m/min, the annealing voltage is 32V, and finally a finished product with the diameter of 0.1mm is obtained through the micro-drawing continuous annealing machine, the drawing speed is 1000m/min, and the annealing voltage is 31V.
Example 5
The embodiment of the invention provides a composite wire electrode, which comprises: a core material and a surface layer;
the core material is common brass;
the surface layer is made of superplastic zinc-manganese alloy;
the preparation method for preparing the composite electrode wire comprises the following steps of:
(1) A zinc-manganese alloy extrusion rod with superplasticity required for preparing a surface layer comprises the following steps:
a. upward continuous casting: putting 99.9% of zinc and 0.1% of manganese by weight into an upward continuous casting furnace, smelting at 700 ℃, casting a zinc-manganese alloy upward guide rod with the diameter of 22mm at a traction speed of 1.5m/min, and coating an antioxidant on the surface when taking up, wherein the ratio of the antioxidant to water is 1:100;
b. continuous extrusion: continuously extruding the zinc-manganese alloy upper guide rod with the diameter of 22mm for 5 times, wherein the preheating temperature of a die cavity is 300 ℃, the rotating speed of an extrusion wheel is 5rpm, the diameter of the zinc-manganese alloy upper guide rod is 8mm after the zinc-manganese alloy upper guide rod is extruded for the first time, the diameter of the zinc-manganese alloy upper guide rod is 7.5mm after the zinc-manganese alloy upper guide rod is extruded for the second time, the diameter of the zinc-manganese alloy upper guide rod is 7mm after the zinc-manganese alloy upper guide rod is extruded for the third time, the diameter of the zinc-manganese alloy upper guide rod is 6.5mm after the zinc-manganese alloy upper guide rod is extruded for the fifth time, and the diameter of the zinc-manganese alloy upper guide rod is extruded for the fifth time;
(2) Preparing a common brass rod required by a core material, and removing dust and grease on the surface, wherein the diameter of the brass rod is 7.2mm, the copper content is 63wt%, and the balance is zinc and inevitable impurities;
(3) Continuous extrusion coating: forming a composite material with the diameter of 7.5mm by using a common brass rod with the diameter of 7.2mm as a core material and two zinc-manganese alloy extrusion rods with the diameter of 6mm as surface layers through a continuous extrusion coating machine, wherein the coating speed is 200m/min, the distance between a coating module and a guide die is 7mm, and the gap between the guide die is 0.6mm;
(4) Wire drawing and annealing: passing the composite material with the diameter of 7.5mm through a large drawing continuous annealing machine to obtain the composite material with the diameter of 3mm, wherein the drawing speed is 400m/min, and the annealing voltage is 37V; then obtaining a composite material with the diameter of 1.2mm by a middle-drawing continuous annealing machine, wherein the drawing speed is 600m/min, and the annealing voltage is 35V; then a composite material with the diameter of 0.3mm is obtained through a micro-drawing continuous annealing machine, the drawing speed is 800m/min, the annealing voltage is 33V, and finally a finished product with the diameter of 0.1mm is obtained through the micro-drawing continuous annealing machine, the drawing speed is 1000m/min, and the annealing voltage is 30V.
Comparative example 1
Commercially available galvanized wire, 0.3mm in diameter.
Comparative example 2
Commercially available galvanized wire, 0.25mm in diameter.
Comparative example 3
Commercially available galvanized wire, 0.2mm in diameter.
Effect evaluation 1
The tensile strength of the finished products with a diameter of 0.25mm or less in examples 1 to 5 and comparative examples 1 to 3 was tested according to the specifications of GB/T10537, the tensile strength of the finished products with a diameter of > 0.25mm in examples 1 to 5 and comparative examples 1 to 3 was tested according to the specifications of GB/T228.1-2010, and the electrical conductivity of all the finished products in examples 1 to 5 and comparative examples 1 to 3 was tested according to the specifications of GB/T351. The results are shown in the following table:
TABLE 1 Performance test Table for examples and comparative examples
| Diameter (mm) | Tensile strength (MPa) | Electrical conductivity (% IACS) | |
| Example 1 | 0.3 | 928 | 23.6 |
| Example 2 | 0.25 | 974 | 21.8 |
| Example 3 | 0.2 | 1045 | 21.1 |
| Example 4 | 0.1 | 1102 | 20.4 |
| Example 5 | 0.07 | 1156 | 19.2 |
| Comparative example 1 | 0.3 | 935 | 23.5 |
| Comparative example 2 | 0.25 | 987 | 22 |
| Comparative example 3 | 0.2 | 1033 | 21.2 |
By comparing the examples and comparative examples in table 1, it is clear that the tensile strength and electrical conductivity of the composite material of the present invention are not much different from those of the commercially available materials at the same diameter. The present invention can be processed to a size of 0.1mm or less, and has excellent processability.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The preparation method of the composite electrode wire is characterized by comprising the following steps of:
s1: mixing metal zinc and metal manganese, smelting, and carrying out up-drawing continuous casting to obtain a zinc-manganese alloy up-drawing rod;
s2: continuously extruding the zinc-manganese alloy upper guide rod to obtain a zinc-manganese alloy extrusion rod; the continuous extrusion times are 5-10 times, and the deformation of the first extrusion is more than 80%;
s3: taking a brass rod as an inner core and two zinc-manganese alloy extrusion rods as outer surface layers, and extruding and coating to obtain a composite material; the ratio of the cross section area of the brass rod to the cross section area of the composite material is 1:1.01-1.10;
the sum of the sectional areas of the two zinc-manganese alloy extrusion rods is larger than the sectional area of the brass rod;
s4: carrying out wire drawing and annealing on the composite material to obtain the composite electrode wire;
in the zinc-manganese alloy upper guide rod, the mass fraction of zinc is 99.0-99.9%.
2. The method according to claim 1, wherein the melting temperature in step S1 is 600-700 ℃.
3. The manufacturing method according to claim 1, wherein in the step S1, the speed of the up-drawing continuous casting is 0.5 to 1.5m/min.
4. The production method according to claim 1, wherein in the step S1, an antioxidant is coated after the up-casting; the antioxidant comprises amino acid salt of methylbenzotriazole and water.
5. The preparation method of claim 4, wherein the mass ratio of the amino acid salt of the methylbenzotriazole to the water is 1:10-100.
6. The method of claim 1, wherein the continuous extrusion temperature in step S2 is 200 to 300 ℃.
7. The method according to claim 1, wherein in step S3, the extrusion coating is performed by a continuous extrusion coating machine at a coating speed of 10-200m/min.
8. The method of claim 1, wherein the brass rod has a copper content of 60 to 65wt%, and the balance of Zn and other unavoidable impurities.
9. The method according to claim 1, wherein in step S4, a continuous annealing wire drawing machine is used for wire drawing annealing, the annealing voltage is 30-40V, and the drawing speed is 300-1000m/min.
10. A composite wire electrode produced by the production method according to any one of claims 1 to 9.
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