KR100858658B1 - Manufacturing method of tungsten-correr edm electrode - Google Patents

Abstract

Disclosed is a method of manufacturing an electrode for tungsten-copper discharge processing, which has a very homogeneous structure with little residual pores, and which can provide an ease of manufacturing process and reduce manufacturing cost. The electrode manufacturing method for tungsten-copper discharge processing includes the steps of preparing a tungsten-coated tungsten-copper composite powder, mixing a tungsten-coated tungsten-copper composite powder and a binder to prepare a molding mixture, and injection molding the molding mixture. Preparing an injection molded body, removing the binder included in the injection molded body, and sintering the injection molded body from which the binder has been removed. Due to such a manufacturing method, it is possible to provide a discharge electrode that maintains high precision and can simplify the manufacturing process, which is advantageous for mass production, and the manufacturing cost is reduced accordingly.

Discharge electrode, binder, injection, degreasing, sintering

Description

Manufacturing method of electrode for tungsten-copper electric discharge machining {MANUFACTURING METHOD OF TUNGSTEN-CORRER EDM ELECTRODE}

1 is a flowchart illustrating a method for manufacturing an electrode for tungsten-copper discharge machining according to the present invention.

2A and 2B are scanning electron micrographs of tungsten oxide and copper oxide powder used in the manufacture of the discharge electrode of the present invention.

3 is a cross-sectional view illustrating a process of preparing a mixed powder by mixing and grinding tungsten oxide powder and copper oxide powder.

4 is a state diagram showing a process of reducing a mixed powder of mixed and pulverized tungsten oxide powder and copper oxide powder.

5a and 5b are photographs of the scanning electron microscope showing the state of the external shape and cross section of the tungsten-copper composite powder prepared through the process of FIG.

6 is a cutaway perspective view illustrating a process of mixing a composite powder and a binder.

7 is a cross-sectional view showing a process of injection molding a powder mixture of a composite powder and a binder.

8 is a cross-sectional view showing a step of removing a binder included in an injection molded body.

9 is a cross-sectional view showing a step of sintering an injection molded body from which a binder is removed.

10 is a cross-sectional view showing a process of molding a composite powder using a powder press as another embodiment.

<Description of the symbols for the main parts of the drawings>

50: mixed powder 60: binder

70: composite powder 80: powder mixture

90: injection molded body 100: discharge electrode

200: ball mill 210: ball

220: ball mill container 230: roller

300: Double blade mixer 310: Rotary blade

400: injection molding machine 410: cylinder barrel

420 ： Mold 500 ： Solvent degreasing

600: Sintering 700: Powder press

The present invention relates to a method for manufacturing an electrode for tungsten-copper electric discharge machining, and more particularly, to a method for manufacturing an electrode for tungsten-copper electric discharge machining, which has a very homogeneous structure with little residual pores and can be precisely manufactured in a desired shape without machining. It is about.

Electrical discharge machining is a type of electrical processing, in which the discharge phenomenon is artificially set, and the energy is processed to process the appearance of a workpiece such as cutting or cutting. In other words, it can be said to be an electroprocessing method in which a hole (mainly a metal work piece) is drilled by a erosion action of a spark discharge continuously generated in an insulating liquid or cut into a desired phenomenon.

Such discharge machining can induce the workpiece as the anode, the tool electrode as the cathode, put it in an insulating liquid, apply a current to the electrode, and repeat the pulse discharge to erode the workpiece. Widely used in processing.

However, in order to process a very precise shape, a tool electrode material having high strength and excellent arc resistance and abrasion resistance is required. Previously, copper was widely used as an electrode material, but recently, a tungsten-copper material having superior strength and excellent corrosion resistance than copper has been widely used as an electrode for discharge.

In the case of conventional tungsten-copper electrode material, a tungsten-copper mixed powder compact having a predetermined internal pore is manufactured by mixing tungsten and copper powder, and then sintered to form a skeleton having pores therein, and copper is melted to form a skeleton. Infiltration into the interior has been mainly used.

However, there are the following problems in the manufacturing method of the discharge electrode of the conventional tungsten-copper material.

The tungsten-copper electrode material produced by the above-mentioned infiltration method dissolves during the sintering process and the initially mixed copper powder is dissolved into the surrounding tungsten powders by capillary force. By replacing the pores, a tungsten-copper electrode material having a region where tungsten and copper are not evenly distributed is produced.

In addition, since copper must be melted for copper infiltration, the actual process is carried out at a high temperature of more than 1100 degrees Celsius (copper melting point of 1083 degrees), and thus, due to the difference in thermal expansion coefficient of tungsten and copper during cooling to room temperature after a successful infiltration process Residual pores are generated in the tungsten and copper interface by more than 1% to 2%. The heterogeneous structure and residual pores in the tungsten-copper material generate an inhomogeneous arc during discharge processing and cause inhomogeneous abrasion of the electrode, thereby lowering the roughness of the machining surface and worsening the machining precision.

In addition, the crack generation due to the heterogeneous wear of the electrode due to the inhomogeneous structure and residual pores in the tungsten-copper material and the difference in the local coefficient of thermal expansion of tungsten and copper during the discharging process resulted in the life of the tungsten-copper electrode material. This greatly shortens the time.

In addition, discharge processing is performed by machining a tungsten-copper electrode material into a shape to be processed. In this case, a tungsten-copper material having a higher strength and higher abrasion resistance than copper has a complicated shape and a precision processing material. Loss is time consuming, time consuming, and machining error is large due to wear of cutting tool. In particular, even in the case of mass discharge machining of the same shape, the discharge electrodes must be made by cutting one by one, which takes a lot of time and increases the cost. In addition, when machining the discharge electrode of the same shape, the machining equipment is changed, or even in the same machining equipment, the machining precision is changed according to the wear state of the cutting tool is reduced the precision of the workpieces manufactured by the final discharge machining.

Accordingly, the present invention has been made to solve the above problems, to minimize the residual pores by eliminating the copper infiltration process, to have a very homogeneous structure to improve the thermal conductivity, ductility, tensile strength and fatigue strength The present invention provides a method for manufacturing an electrode for tungsten-copper discharge processing.

Another object of the present invention is to provide a method for manufacturing an electrode for tungsten-copper electric discharge machining, which can be injection molded using tungsten-coated tungsten-copper powder, which can be easily manufactured in a desired shape and can reduce manufacturing cost. .

Still another object of the present invention is to provide a method for manufacturing an electrode for tungsten-copper discharge processing, which is capable of powder compression molding, which is quick and easy to manufacture, which is advantageous for mass production, and improve processing precision.

According to a preferred embodiment of the present invention for achieving the above object of the present invention, the method for manufacturing an electrode for tungsten-copper discharge processing comprises the steps of preparing a tungsten-copper composite powder coated on the outer tungsten copper; Forming a discharge electrode by using the same. Discharge electrodes can be manufactured in two ways using the prepared composite powder.

One is a powder injection molding method, in which a discharge electrode may be manufactured by adding a step of preparing an injection molded body after mixing a binder with the prepared composite powder and sintering the injection molded body after removing the binder.

The other one is a powder compression molding method, in which the composite powder may be compression molded to produce a compression molded body, and the sintering of the molded body may be performed to manufacture a discharge electrode.

The tungsten-coated tungsten-copper composite powder may be prepared by uniformly mixing tungsten oxide powder and copper oxide powder, pulverizing to prepare a mixed powder, and thermally increasing the temperature of the mixed powder step by step. The tungsten powder may form the composite powder having a structure surrounding the copper powder.

The preparing of the mixed powder may further include grinding the tungsten oxide powder and the copper oxide powder through a process such as ball milling in a range of 1 minute to 50 hours.

In addition, a method for manufacturing an electrode for tungsten-copper discharge processing includes preparing a tungsten-coated tungsten-copper composite powder, and mixing the tungsten-coated tungsten-copper composite powder with a binder to prepare a powder mixture (feedstock). And a step of injecting the powder mixture into an injection molding machine to produce an injection molded body, removing the binder included in the injection molded body, and sintering the injection molded body from which the binder is removed. As the injection machine, a cylinder having a screw formed therein may be used. The binder may be a binder, a lubricant, a plasticizer, a surfactant, and the like, and mixtures thereof. Specifically, stearic acid or paraffin wax may be used.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments.

1 is a flowchart illustrating a method for manufacturing an electrode for tungsten-copper discharge machining according to the present invention.

As shown in the drawing, in the method for manufacturing an electrode for tungsten-copper discharge processing, a step of manufacturing a tungsten-coated tungsten-copper composite powder (S1) and a powder mixture by mixing the tungsten-coated tungsten-copper composite powder and a binder Manufacturing step (S2), injection molding the powder mixture to produce an injection molded body (S3), removing the binder included in the injection molded body (S4) and sintering the injection molded body from which the binder is removed Step S5 is made.

In the step (S1) of preparing a tungsten-coated tungsten-copper composite powder, a mixed powder is prepared by uniformly mixing and grinding tungsten oxide (WO ₃ or WO _2.9 ) powder and copper oxide (CuO or Cu ₂ O) powder. After that, in a reducing atmosphere is maintained at a temperature range of 200 to 400 ° C for 1 minute to 5 hours, and then again the temperature is maintained for 1 minute to 5 hours in the temperature range of 500 to 700 ° C. Subsequently, by raising the temperature again, a reduced heat treatment may be performed at a temperature range of 750 to 1080 ° C. for 1 hour to 5 hours to obtain a tungsten-copper composite powder having a structure in which tungsten surrounds the copper powder.

Here, the mixed powder refers to a powder in which different powders are simply physically mixed, and refers to a powder in which tungsten oxide powder and copper oxide powder are physically simply mixed. In addition, the composite powder refers to one independent powder in which different components are chemically bonded to each other, and refers to a powder in which tungsten powder is chemically bonded in a form of wrapping copper powder.

In the step (S2) of mixing the tungsten-coated tungsten-copper composite powder and a binder to prepare a powder mixture, the tungsten powder is a tungsten-copper composite powder having a structure in which the copper powder is coated. Mix% binder. This mixing produces a powder mixture capable of injection molding.

On the other hand, the binder gives a liquidity in the form of a liquid at the time of injection molding, and in order to maintain the raw powder in a large shape, it is added in a large amount, but the process of removing the binder before sintering, binder removal is also an important point of binder selection to be. Items to consider when selecting the binder include the presence or absence of reaction with the raw material powder, heating fluidity, leakage to the raw material powder, compatibility between the binder, and the shape retention and thermal decomposition characteristics (remaining carbon amount) of the molded body.

In the step (S3) of manufacturing the injection molded body by injection molding the powder mixture, the injection molded body is manufactured by using a mold having a shape to be processed using the powder mixture, that is, a discharge electrode. Can be produced through the conventional metal injection molding (MIM) process that combines the advantages of both the injection molding technology used in the plastics industry and the sintering technology of metal powders developed in the powder metallurgy industry.

That is, the powder mixture is sent into the cylinder of the injection molding machine and transported while being plasticized, and injected into the mold from the cylinder nozzle to cool and solidify, thereby allowing the injection molded body to be extracted.

The mold is important to design the shape and the numerical value of the flow path so that the filling of the powder mixture plasticized by heating is smooth. In addition, the mold is preferably formed of a structure that can control the temperature for a uniform temperature distribution of the surface in the cavity (cavity).

In the step (S4) of removing the binder included in the injection molded body, a part of the mixed binder is melted using a solvent in the injection molded body, and then the remaining binder is burned off by heating.

As another method of removing the binder contained in the injection molded body, the binder mixed in the injection molded body may be removed by only heating the injection molded body. At this time, when the temperature is raised, the binder mixed in the injection molded body is removed by melting and vaporizing. In addition, a method using a photodegradable binder, a method of promoting evaporation using a vacuum atmosphere, and the like have been proposed and implemented.

The step (S5) of sintering the injection molded body from which the binder is removed removes the binder by using the hydrogen atmosphere having a temperature range of 1090 ° C to 1500 ° C or a reducing atmosphere containing hydrogen in the injection molded body from which the binder is removed. It is a process of forming an injection molded body, that is, a sintered body. Through this sintering process, the sintered compact is densified to more than 99% of the theoretical density and even if the residual pores of the final sintered compact are 1-2%, the particle size of the tungsten-coated tungsten-copper composite powder is very within 2mm. Since the size of tungsten particles is very small, particularly in the range of 10 nm to 1 mm, the quality of the residual pores during discharge processing due to residual pores is hardly deteriorated because the size of the residual pores after sintering is very small within 2 mm.

According to the shape of the workpiece, after the injection molding is produced by compression molding the tungsten-copper composite powder coated with tungsten in the mold of the workpiece instead of the second step (S2) to the fourth step (S4). , Through the sintering process of the fifth step (S5) can be made a discharge electrode. In some cases, some of the binder may be mixed in the tungsten-copper composite powder for the convenience of the powder compression molding process, and in this case, it may be necessary to remove the binder before sintering after mold compression molding.

2A and 2B are scanning electron micrographs of a tungsten oxide powder and a copper oxide powder for preparing a discharge electrode of the present invention, and FIG. 3 is a process of mixing and grinding tungsten oxide powder and copper oxide powder to prepare a mixed powder. It is a cross-sectional view showing.

As shown therein, the ball mill 200 has a ball mill container 220 having an accommodation space therein, a plurality of balls 210 and the ball mill container 220 stored in the accommodation space at a constant angular velocity. 230. The ball 210 is good to use a material of high hardness and low wear rate.

After the tungsten oxide powder and the copper oxide powder are introduced into the ball mill container 220, the roller 230 is operated to rotate the ball mill container 220. One of the rollers 230 is connected to the motor and rotated by the driving force of the motor, and the other is rotated through friction with the milling vessel 220 as an idle roller. When the ball mill container 220 rotates, the tungsten oxide powder and the copper oxide powder introduced into the accommodation space collide with the plurality of balls 210 and are mixed and pulverized.

As a result of mixing and grinding during the ball milling process, as the ball mill container 220 rotates, the mixed powder 50 of the ball 210 and tungsten oxide and copper oxide is formed at a suitable height by the relationship between gravity and centrifugal force. By dropping, colliding with the mixed powder 50 in the lower portion of the receiving space, the impact energy breaks the powder to cause micronization. As the material of the ball 210, cemented carbide or surface-hardened steel or stainless steel balls are mainly used.

4 is a state diagram illustrating a process of reducing and processing a mixed powder of tungsten oxide powder and copper oxide powder mixed and pulverized, and FIGS. 5A and 5B illustrate an external shape of a tungsten-copper composite powder prepared through the process of FIG. A photograph of a scanning electron microscope showing the state of the cross section.

Referring to the graph of FIG. 4, which is presented as an example of the heat treatment process, the mixed powder is heated to 250 ° C. at an elevated temperature of 10 ° C. per minute in a dry hydrogen atmosphere with a dew point of −60 ° C. After raising for 1 hour to reduce the copper powder primarily, after raising the temperature again to maintain at 650 ° C for 1 hour to nucleate tungsten on the secondary reduced copper powder, the temperature is again raised to 860 ° C After maintaining for 1 hour in the third tungsten growth by tungsten is reduced to the tungsten coated on the copper powder and then cooled to prepare the tungsten-copper composite powder.

Looking at the composite powder prepared by the step-by-step heat treatment process in the photos of Figures 5a and 5b, it can be seen that tungsten is coated by coating the copper powder.

6 to 9 illustrate a method of manufacturing a tungsten-copper discharge electrode using a tungsten-copper composite powder, FIG. 6 is a cutaway perspective view illustrating a process of mixing a composite powder and a binder, and FIG. 7 is a powder mixture. 8 is a cross-sectional view illustrating a step of removing the binder contained in the injection molded body, and FIG. 9 is a cross-sectional view illustrating a process of sintering the injection molded body from which the binder is removed.

As shown in the drawing, the two-blade mixer 300 is a cylindrical container having a receiving space therein, and the pair of rotary blades 310 can rotate and rotate in the receiving space.

The composite powder 70 and the binder 60 are introduced into the two-blade mixer 300, and the rotary blade 310 is rotated to mix the two materials to prepare a powder mixture 80. The rotary blade 310 may be formed in various shapes so that the composite powder 70 and the binder 60 is well mixed. As the binder 60, paraffin wax, polyethylene, polypropylene, stearic acid, or the like may be used.

In addition to the double blade mixer 300 used in the present embodiment, an extruded mixer may be used. The extruder mixer has a screw formed therein, and the screw can rotate to uniformly mix the composite powder 70 and the binder 60 with a strong shear force. In addition, in some cases, the mixed powder 70 and the binder 60 may be mixed with the two-blade mixer 300, and then the powder mixture 80 may be more homogeneously manufactured using an extruded mixer.

An injection molding machine 400 may be used to injection mold the powder mixture 80. The injection molding machine 400 includes a cylinder barrel 410 and a mold 420. The cylinder barrel 410 has an accommodating space therein, and the screw 415 rotates in the accommodating space to reciprocate.

When the powder mixture 80 is put into the cylinder 410 and the screw 415 is operated, the powder mixture 80 is transferred toward the mold 420 by the screw 415. Thereafter, the powder mixture 80 is injected into the mold 420 from the nozzle and cooled to solidify, thereby forming the injection molded body 90.

In order to soften the filling of the powder mixture 80 plasticized by heat treatment, the design of the shape and dimensions of the accommodation space is important.

Solvent degreaser 500 may be used to remove the binder 60 from the injection molded body 90. The solvent 510 capable of dissolving the wax component among the components of the binder 60 is stored in the solvent degreaser 500. As the solvent 510, normal hexane (n-hexane), heptane (Heptane), thinner, or the like may be used. When the injection molded body 90 is introduced into the solvent 510, a wax component of the binder 60 component is separated from the injection molded body 90 to be dissolved in the solvent 510. Typically, the temperature of the solvent 510 is about 50 ° C., and may be raised up to 70 ° C. to 80 ° C. The injection molding body 90 from which the wax component is removed may be transferred to a hot degreasing furnace 520, and the binder 60 remaining on the injection molding body 90 may be burned in the hot degreasing furnace 520. Typically, the temperature inside the hot degreasing furnace 520 is about 450 ° C., at which temperature the binder 60 is burned at least 99%. In addition, in order to facilitate handling before transferring the injection molded body 90 from which the binder 60 is removed to the sintering furnace 600, the temperature of the hot degreasing furnace 520 is raised to about 800 ° C. to 900 ° C. for preliminary sintering. can do.

In the present embodiment, a method of removing the binder 60 using the solvent 510 has been described as an example. However, the injection molded body 90 may be omitted using the hot degreasing process without the solvent degreasing step. 90 may be used to remove the binder 60.

Finally, the sintering furnace 600 may be used to sinter the injection molded body 90 from which the binder 60 is removed. The sintering furnace 600 may provide a hydrogen atmosphere in the range of 1090 ° C to 1500 ° C or a reducing atmosphere including hydrogen. By sintering the injection molded body 90 from which the binder 60 is removed in the sintering furnace 600, a discharge electrode 100 may be manufactured, which is a sintered compact having a density higher than or equal to 99% of a theoretical density.

10 is a cross-sectional view showing a process of molding a composite powder using a powder press as another embodiment.

As shown in FIG. 4, the tungsten-coated tungsten-copper composite powder 70 manufactured through the process of FIG. 4 may be molded using the powder press 700, which is referred to as powder compression molding. The powder press 700 is composed of a body portion 710 having a groove for receiving the object to be compressed, and a press part 720 for pressing the object to be compressed while linearly reciprocating at the upper portion of the body part 710. . In the present embodiment, the composite powder 70 may be accommodated in the groove of the body 710 and then pressed into the press unit 720 to manufacture a compression molded body. The compression molded product thus manufactured may be discharged into a sintering furnace shown in FIG. 9 and then subjected to a sintering process. In some cases, a part of the binder may be mixed with the composite powder 70 for convenience in the powder compression molding process. In this case, the step of removing the binder before sintering after molding by the powder press 700 may be performed. Is added.

As described above, the electrode for producing a tungsten-copper electric discharge machining does not require a copper infiltration process, so that a discharge electrode having almost no residual pores and having a very homogeneous structure can be manufactured. In addition, the process can be simplified, and a large amount of discharge electrodes can be manufactured in a short time.

As described above, the electrode manufacturing method for electric discharge machining according to the present invention can omit the copper infiltration process using a tungsten-coated copper powder to obtain a homogeneous structure with little residual pores when producing a discharge electrode It can be effective.

In addition, injection molding using a composite powder is possible, making it easy to manufacture a desired shape, and there is an effect of improving the precision of processing.

In addition, it is possible to obtain a discharge electrode having a high strength and excellent surface roughness by manufacturing a composite material through a variety of weight ratio and heat treatment.

In addition, powder compression molding using a powder press is possible, which simplifies the manufacturing process and shortens the manufacturing time, thereby facilitating mass production and thus reducing manufacturing costs, thereby lowering the cost of the product.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (19)

In the method for manufacturing an electrode for tungsten-copper electric discharge machining, Preparing a tungsten-copper composite powder coated with tungsten on the outside of copper; And Shaping a discharge electrode using the composite powder; Including, Preparing a tungsten-copper composite powder coated on the outer tungsten copper Uniformly mixing tungsten oxide powder and copper oxide powder to pulverize to prepare a mixed powder; And Increasing the temperature of the mixed powder step by step to heat treatment; Tungsten-copper discharge processing electrode manufacturing method comprising a. The method of claim 1, Forming the discharge electrode is Preparing an injection molded body after mixing the composite powder and a binder; And Sintering the injection molded body after removing the binder; Tungsten-copper discharge processing electrode manufacturing method further comprising. The method of claim 1, Forming the discharge electrode is Mold compression molding the composite powder to produce a compression molded body; And Sintering the compression molded body; Tungsten-copper discharge processing electrode manufacturing method characterized in that it further comprises. delete delete In the method for manufacturing an electrode for tungsten-copper electric discharge machining, Preparing a tungsten-coated tungsten-copper composite powder; Preparing a powder mixture by mixing the tungsten-coated tungsten-copper composite powder and a binder; Manufacturing an injection molded body by injecting the powder mixture into an injection molding machine; Removing the binder included in the injection molded body; And Sintering the injection molded body from which the binder is removed; Including, Preparing a tungsten-coated tungsten-copper composite powder Preparing a mixed powder by uniformly mixing and grinding tungsten oxide powder and copper oxide powder; Heat treatment for 1 minute to 5 hours at a temperature ranging from 200 ° C. to 400 ° C., which is a reducing atmosphere; Heat treatment for 1 minute to 5 hours at a temperature ranging from 500 ° C. to 700 ° C., which is a reducing atmosphere; And Cooling after heat treatment for 1 minute to 5 hours at a temperature ranging from 750 ° C. to 1080 ° C. in a reducing atmosphere; Tungsten-copper discharge processing electrode manufacturing method comprising a. delete The method of claim 6, The composite powder is a tungsten-copper discharge processing electrode manufacturing method, characterized in that the weight ratio of copper to tungsten in the range of 0.1 to 0.9. The method of claim 6, Preparing the powder mixture Tungsten-copper discharge processing electrode manufacturing method characterized in that it further comprises the step of mixing the binder in a volume ratio of 30% to 70% in the composite powder. The method of claim 9, The step of manufacturing the injection molded body And passing the powder mixture through a mold having an inner space corresponding to the outer shape of the electrode for electric discharge machining, to form the injection molded body. The method of claim 10, Removing the binder is Injecting the injection molded product into a degreasing solvent to remove the wax component from the binder component; And Heating the injection molded body from which the wax component is removed to remove the binder; Tungsten-copper discharge processing electrode manufacturing method comprising a. The method of claim 11, Sintering the injection molded body The injection molded body is sintered in a hydrogen atmosphere in the range of 1090 ℃ to 1500 ℃ or a reducing atmosphere containing hydrogen, tungsten-copper discharge processing electrode manufacturing method. The method of claim 10, Removing the binder is A method of manufacturing an electrode for tungsten-copper discharge processing, wherein the injection molded body is heated to vaporize the binder. In the method for manufacturing an electrode for tungsten-copper electric discharge machining, Preparing a tungsten-coated tungsten-copper composite powder; Pressing the composite powder with a powder press to produce a compression molded article; And Sintering the compression molded body; Including, Preparing a tungsten-coated tungsten-copper composite powder Preparing a mixed powder by uniformly mixing and grinding tungsten oxide powder and copper oxide powder; Heat-treating the mixed powder in a reducing atmosphere at a temperature ranging from 200 ° C. to 400 ° C. for 1 minute to 5 hours; Heat-treating the mixed powder for 1 minute to 5 hours in a temperature range of 500 ° C to 700 ° C; And Cooling the mixed powder after heat treatment in a temperature range of 750 ° C. to 1080 ° C. for 1 minute to 5 hours; Tungsten-copper discharge processing electrode manufacturing method comprising a. delete The method of claim 14, Preparing the mixed powder is The tungsten oxide powder and copper oxide powder manufacturing method of the electrode for tungsten-copper discharge processing further comprising the step of pulverizing in a range of 1 minute to 50 hours. The method of claim 14, The step of manufacturing the compression molded body The method of manufacturing an electrode for tungsten-copper discharge processing, further comprising the step of mixing a binder in the composite powder. The method of claim 17, The step of manufacturing the compression molded body Tungsten-copper discharge processing electrode manufacturing method characterized in that it further comprises the step of removing the binder. The method of claim 14, The composite powder is a tungsten-copper discharge processing electrode manufacturing method, characterized in that the weight ratio of copper to tungsten in the range of 0.1 to 0.9.

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