KR101132340B1 - Electrode for electrical discharge machining and manufacturing methode of thesame - Google Patents

Abstract

Disclosed are an electrode for electric discharge machining and a method of manufacturing the same.

The electrode for electric discharge machining of the present invention comprises a copper plate material attached to the upper surface of the copper plate and the surface pattern of the object is replicated through the sequential pre-plating from the object to duplicate the copper plate and the surface pattern having a predetermined thickness and area, It is effective to replicate the surface pattern of natural and artificial objects with the same texture on hard metal hard to be processed by the electric discharge machining.

Copper shell, surface pattern, object, electroplating, copper plate material, electrode for electric discharge machining

Description

Electrode for electric discharge machining and its manufacturing method {ELECTRODE FOR ELECTRICAL DISCHARGE MACHINING AND MANUFACTURING METHODE OF THESAME}

The present invention relates to an electrode for electric discharge machining and a method of manufacturing the same, and more particularly, comprising a copper plate material that the surface pattern of the object is replicated and attached to the upper surface of the angle through sequential pre-plating from the object to replicate the surface pattern. The present invention relates to an electrode for electrical discharge machining and a method of manufacturing the same.

Electrical Discharge Machining (EDM), also known as spark machining, refers to the process of sparking when the anode and cathode of electricity strike, as the name implies.

The thermal energy generated by the spark dissolves or vaporizes the material to be processed to give it the desired shape. Of course, the discharge is controlled to occur very small and very fast, and the processing part of the specimen becomes very small particles, which are precisely processed because they are melted or vaporized and removed.

The absolute condition of electrical discharge machining is that the specimen serving as the anode must be electrically conductive in order to generate sparks. Because of this condition, electrical discharge machining has been widely used in metal processing.

In the electric discharge machining, the distance between the electrode and the workpiece is close to several micrometers and sparks occur at the closest distance. The flame immediately becomes a fine arc column and immediately flows electricity having a high current density to hit a point on the workpiece so that the same shape as that of the electrode is formed on the workpiece.

The skin or surface of objects naturally present in nature, such as plants, insects, leather, minerals, wood, fibers or fabrics, and the surface patterns of various objects produced by artificial processing can exhibit beautiful and varied textures and patterns. . Therefore, efforts have been made to decorate the exterior of industrial products that are mass-produced with such surface patterns of natural or artificial objects.

Particularly, the surface pattern of natural or artificial object is duplicated on the electrode for electric discharge machining, and the surface pattern is duplicated by discharging operation on the metal that is hard to be processed due to the hard metal and other materials. It is necessary to develop a technology that can be applied to a portable product that is portable and always visible to others.

Therefore, an object of the present invention for solving the above problems is attached to the copper plate material having the surface pattern of the object is replicated through the sequential pre-plating from the object to duplicate the surface pattern on the same angle and the same angle having a certain thickness and area, It is to provide an electrode for electric discharge machining that can replicate the surface pattern of the object replicated in the copper plate material to the cemented carbide through electric discharge machining.

In addition, another object of the present invention is to prepare an object to replicate the surface pattern, the surface of the object is imprinted in a plastic mold, the plastic mold pre-plated with metal and then separated to replicate the surface pattern of the object in the metal mold , The metal mold is pre-plated with copper and separated, and the surface pattern of the object is duplicated on the copper plate, and then attached to the upper surface of the copper shell, thereby disposing the surface pattern of the object pre-plated on the copper plate by electric discharge machining with cemented carbide. It is to provide a method for producing an electrode for electric discharge machining, which can be replicated in the same manner as metal.

In order to achieve the above object, the present invention includes a copper plate material that is duplicated on the upper surface of the angle of the surface pattern of the object by sequential pre-plating from the object to replicate the same angle and surface pattern having a certain thickness and area An electrode for electrical discharge machining is provided.

The copper plate material, by imprinting the surface of the object to replicate the surface pattern to replicate the surface pattern of the object to the plastic mold, pre-plating the duplicated plastic mold with metal and then separated to separate the surface pattern of the metal mold The surface of the object may be replicated by duplicating the metal mold and replicating the metal mold.

The sheet resistance value at any of a plurality of points of the copper plate material may be 10.0 × 10 ⁻⁴ μm / m 2 (error range ± 10%) or less.

The copper plate may have a thickness of about 100 μm to about 1 mm.

In addition, in order to achieve the above object, the present invention (a) preparing a copper shell having a predetermined thickness and area, (b) preparing an object to replicate the surface pattern, (c) the surface of the prepared object Duplicating the surface pattern of the object to a plastic mold by printing; (d) metallizing the surface of the replicated plastic mold, pre-plating the replicated plastic mold with metal, and then separating and removing the surface pattern of the object. Duplicating the metal mold; (e) pre-plating the duplicated metal mold with copper and then separating and duplicating the surface pattern of the object on the copper plate; and (f) copying the duplicated copper plate on the top of the copper shell. It provides a method for producing an electrode for electrical discharge machining comprising the step of attaching to the surface.

In the step (f), the copper plate member is attached to the copper shell by soldering a portion corresponding to the copper plate member on the upper surface of the copper plate and soldering and joining the edge portion or the entire surface of the lower surface of the copper plate member. Can be.

In the step (f), after the soldering, the vertices of the copper plate may be fixed with a plurality of fixing members.

When the area of the copper plate is 20 × 40 mm, the amount of lead when soldering the copper plate to attach the copper plate may be 90 to 110 g.

According to the electrode for electric discharge machining of the present invention described above, a copper plate material of which the surface pattern of the object is replicated is adhered to the copper shell having a predetermined thickness and area and the surface pattern of the object through sequential electroplating from the object to be reproduced. The surface pattern of the object replicated on the plate has the effect that can be replicated to the cemented carbide through electric discharge machining.

In addition, according to the present invention to prepare an object to replicate the surface pattern, the surface of the object is imprinted in a plastic mold, the plastic mold is pre-plated with metal and separated to replicate the surface pattern of the object in the metal mold, After the mold is pre-plated with copper, the surface pattern of the object is duplicated, and the copper plate material having the duplicated surface pattern is attached to the upper surface of the copper shell. There is an effect that can produce an electrode for electrical discharge machining that can be replicated.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may properly define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a schematic perspective view showing an electrode for electrical discharge machining according to a first embodiment of the present invention, and FIG. 2 is a photograph of the electrode for electrical discharge machining according to the first embodiment of the present invention.

Referring to Figure 1, the electrode 100 for electrical discharge machining according to the first embodiment of the present invention is a variety of artificial manufactured by a natural object or artificial processing including plants, insects, leather, minerals, wood, fibers or fabrics The surface pattern of the object is made of a hard metal material such as cemented carbide, which is hard to form a fine surface pattern by machining, and is reproduced by the electric discharge machining method, and includes a copper shell 110 and a copper plate 120. .

The angle 110 is also called a copper base and is a piece of copper having a certain thickness and area. The angle 110 is a configuration for supporting the copper plate member 120 and the energization function during electrical discharge machining. The copper shell 110 generally uses a conductive metal and graphite, but it is useful to use copper and a copper alloy (copper-silver, copper-silver-gold) when discharging the cemented carbide.

Copper plate 120 is a plate attached to the upper surface of the copper shell 110, the surface pattern of the object is replicated on one side through the sequential electroplating from the natural or artificial object to replicate the surface pattern.

Specifically, the copper plate 120 imprints the surface of the object to replicate the surface pattern to replicate the surface pattern of the object to the plastic mold, and pre-plated the replicated plastic mold with a metal mold to metallize the surface pattern of the object Duplicate the metal mold by duplicating the duplicated metal mold with copper, then separating and duplicating the surface pattern of the object. This will be explained in more detail later.

1 and 2, the copper plate 120 is generally located in the middle of the upper surface of the copper plate 110, the thickness of the copper plate 120 is very thin than the thickness of the copper plate 110 It is characteristic. In one example, the thickness of the copper plate 120 may be 100㎛ to 1mm, the thickness deviation is preferably processed in the range ± 5%, the thickness and thickness deviation is not limited thereto.

On the other hand, when attaching the lower surface of the copper plate member 120 to the upper surface of the copper plate 110, the entire attachment surface or the edge portion is attached by soldering, whereby the soldering portion between the copper plate 110 and the copper plate member 120 130 is formed. In addition to soldering, other welding may be performed, but the joint edges of the copper shell 110 and the copper plate 120 are joined. In this case, the surface resistance distribution is well maintained and within 10.0 × 10 ^-4 Ω / ㎡ Should be maintained.

3 is a flowchart illustrating a method of manufacturing an electrode for electrical discharge machining according to a first embodiment of the present invention, and FIGS. 4 to 6 are views illustrating a process of attaching copper and copper plates according to a first embodiment of the present invention.

Referring to FIG. 3, first, as shown in FIG. 4A, in step S310, an equiangular disc 111 having a predetermined thickness and area is prepared. As shown in (b) of FIG. 4, the same angle disc 110 is cut into 40 × 60 mm to prepare the angle 110. At this time, the area of the angle 110 is not limited thereto.

Next, prepare a natural or artificial object to replicate the surface pattern in step S315. In this case, the process of preparing the object will be described in detail, selecting an object to which the surface pattern is to be duplicated, cleaning the surface of the selected object to remove foreign substances, arranging or arranging the selected state in a planar or curved state, and surface nano Release film treatment. In particular, the peel surface treatment is performed to form a thin film on the surface of the cleaned object so as to separate the plastic mold to be imprinted later.

Next, the surface pattern of the object is replicated in the plastic mold in step S320. When the surface pattern of the object is replicated in the plastic mold, it may be replicated by nanoimprinting the polydimethylsiloxane (PDMS) molding method on the surface of the pretreated object.

In addition, the nano-imprinting may be performed by hot embossing, UV (ultraviolet) imprinting, roll imprinting method, in addition to the PDMS molding method, and a casting method or an injection method may be selectively applied. have.

In this case, nanoimprinting is similar to the concept of painting on paper by making a mold for replicating a fine surface pattern in nano units and engraving a nano structure on a mold surface. In addition to PDMS, nanoimprinting materials can use thermoplastic, thermosetting and UV photocuring resist materials.The basic principle is similar to that of polymer forming process, but to form nano-sized structures, capillary phenomenon, electromagnetic force, molecular and atomic attraction, etc. It should be performed considering the microphysical phenomena of.

Next, the plastic mold replicated in step S325 is pre-plated with a metal mold to replicate the surface pattern of the object on the metal mold. Nickel (Ni) may be generally used, and the metal mold in which the surface pattern of the object is replicated is also referred to as nickel emotex.

Electroplating is a technique of coating other metals on the surface of the metal using the principle of electrolysis.The electroplating is performed by putting the metal to be plated as a cathode and the metal to be electrodeposited in an electrolyte containing ions of the metal to be deposited. It is a technique in which metal ions are electrolytically deposited on the surface by electrolysis.

At this time, the surface of the plastic mold is preferably subjected to metallization to enable plating. At this time, the metallization can be treated with a metal having good plating properties such as silver (Ag) and nickel (Ni), and for the metallization of the plastic mold surface, chemical vapor deposition, plasma vapor deposition, atmospheric pressure chemical vapor deposition, physical Any one of the vapor deposition methods may be used. In addition to the vapor deposition method, it may also be carried out by a spray injection or a wet silver curing method.

Next, the metal mold is pre-plated with the copper plate 120 in S330 to replicate the surface pattern of the object on the copper plate 120. Copper (Cu) may be used as the copper plate 120 in which the surface pattern of the object is replicated, which is also referred to as copper emotex in correspondence with nickel emotex.

That is, the copper emotex is a copper plate material 120 of copper material in which the surface pattern of the object is replicated as it is.

As shown in (b) of FIG. 5, the pattern master 121 having a large area where the surface pattern of the object (wood) is replicated by pre-plating a metal mold as shown in (a) of FIG. The copper plate material 120 cut by using may be cut to have an area of 20 × 35 mm corresponding to the area of the cut copper plate 110, but the area thereof is not limited thereto.

Next, in operation S335, the copper plate 120 may be attached to the upper surface of the copper plate 110 to manufacture the electrode 100 for electrical discharge machining. When the copper plate 120 is attached to the copper plate 110, the copper plate 120 is soldered to a portion where the copper plate 120 of the upper surface of the copper plate 110 is to be located, as shown in FIG. As shown in b), the surface pattern of the object of the copper plate 120 is soldered to the surface where it is not duplicated, and then the copper plate 110 and the copper plate 120 are shown as shown in FIG. It can attach by bonding.

At this time, when soldering to the copper shell 110, only the edge portion of the portion where the copper plate 120 is to be located, or all of the portions corresponding to the area of the copper plate 120 can be soldered. In addition, when soldering to the copper plate member 120, only the edge portion of the copper plate member 120 may be soldered, or the entire area may be soldered.

When soldering the copper plate 120 to the copper shell 110 may cause problems when the amount of lead is used excessively or insufficiently.

FIG. 7 is a view showing an example of attaching copper plate and copper plate material according to the first embodiment of the present invention. As shown in FIG. 7 (a), lead is excessively used and copper plate 120 attached to copper plate 110 is shown. In the process of pressing and bonding, lead escapes like the "A" part, which may affect the replicated surface pattern, and it is difficult to remove the lead.

In addition, Figure 7 (b) is used between the copper plate 110 and the copper plate 120 is insufficient lead so that the copper plate 120 is properly adhered to the upper surface of the copper plate 110, such as "B". Indicates a problem that can not occur.

7 (c) shows a case in which a part of lead is contaminated on the surface of the copper plate 120, such as a portion “C”, on the surface where the surface pattern of the copper plate 120 is replicated. Later, during the electrical discharge machining with the cemented carbide, it is impossible to form the surface pattern on the cemented carbide. Therefore, care should be taken not to lead to the surface pattern of the copper plate 120.

7 (d) shows that when the copper plate 110 and the copper plate 120 are attached using an appropriate amount of lead, the amount of lead flowing out toward the edge of the copper plate 120 is appropriate as in the “D” portion. The part also shows the case where lead is uniformly coated.

Specifically, in the case where the area of the copper plate 120 is 20 × 40 mm, when more than 130 g of lead is used, the amount of lead less than 70 g is insufficient. That is, the amount of lead when soldering for attaching the copper plate 120 to the copper shell 110 may be 70g to 130g, preferably 90 to 110g, but this amount is not limited thereto.

When a suitable amount of lead is uniformly soldered and the area (X × Y) of the copper plate 120 is 55 mm × 105 mm, the sheet resistance value is generally measured at a plurality of points, and is generally 10.00 × 10 ⁻⁴ μm / m 2. The following values are measured, and the sheet resistance value may have an error range of ± 10%.

Table 1 is a table which shows the sheet resistance value measured at the several point of the copper plate material 120. FIG.

X-axis coordinates (mm) Y axis coordinates (mm) Resistance value (Ω / ㎡) One 27.5 88 8.297 × 10 ^-4 2 17 52.5 8.287 × 10 ^-4 3 27.5 52.5 8.504 × 10 ^-4 4 38 52.5 8.176 × 10 ^-4 5 27.5 17 8.001 × 10 ^-4

When a suitable amount of lead is uniformly soldered, and the area (X × Y) of the copper plate 120 is 55 mm × 105 mm, the sheet resistance values are measured at any of a plurality of points, and 8.001 × 10 ⁻⁴ at each of the five points. Sheet resistance values between 8 m 2 and 8.504 × 10 ⁻⁴ m 2 / m 2 are measured. That is, since the difference in sheet resistance value is not large, it can be seen that an appropriate amount of lead is uniformly soldered.

As described above, the copper plate 110 and the copper plate 120 may be attached by welding the edge portion in addition to soldering.

8 is a view showing an example in which the copper plate material is incorrectly attached to the copper angle according to the first embodiment of the present invention, Figure 8 (a) is one side due to the thickness variation of the surface pattern formed on the copper plate 120 When the corner is lowered and the other edge is raised, there is a problem that the first touched place and the later touched place occur when the cemented carbide and the electrode 100 for electric discharge machining contact with the cemented carbide. As a result, the discharge current may be nonuniform, resulting in poor discharge machining.

8 (b) shows that the copper plate 120 is at an angle 110 when the copper plate 120 is thicker than 1 mm when the warpage phenomenon occurs due to the residual stress of the electroplating of the copper plate 120. It shows a case where the flatness is not excellent when attached to the. Even in such a case, the electric discharge machining may be poor in the electric discharge machining with the cemented carbide.

9 and 10 are images showing the surface pattern of the object, the electrode for electric discharge machining and the cemented carbide. 9 (a) shows the surface pattern of the object, FIG. 9 (b) shows the surface pattern duplicated on the electrode 120 for electric discharge machining, and FIG. 9 (c) shows the surface pattern replicated on the cemented carbide metal 100 times. 10A is a surface pattern of an object, FIG. 10B is a surface pattern duplicated on an electrode 120 for electric discharge machining, and FIG. 10C is a surface pattern duplicated on a cemented metal. It is a magnified image.

9 and 10, since the object is silk, and the image of the surface pattern of the same position is not measured, it is difficult to make an absolute comparison. However, in the electrode 120 for electric discharge machining, the surface pattern of the object is well replicated to some extent. It can be judged.

In general, during electric discharge machining, machining is performed several times, called roughing, medium cutting, and finishing. This is because if the machining is performed several times as described above, a finer surface pattern can be obtained. That is, during roughing, even though the surface pattern of the object is not properly replicated as shown in FIGS. 9 and 10 (c), the replication is more excellently performed as shown in FIGS. 9 and 10 (b) through the medium cutting process. In addition, the same replication as the object may be performed as shown in FIGS. 9 and 10 (a) through a finishing process.

As described above, for roughing, medium cutting and finishing, a plurality of copper emotex is required in which the surface pattern of the object is duplicated on the copper plate 120.

In the first embodiment of the present invention, when the nickel imotex is pre-plated with copper emotex, it is possible to easily manufacture a plurality of identical copper emotex by electroplating a plurality of times, so that roughing, medium cutting and finishing can be easily performed. Thus, a finer and same surface pattern as the object can be duplicated on the cemented carbide.

The electrode for electrical discharge machining according to the second embodiment of the present invention will be described with reference to FIG. 11 as follows. 11 is a perspective view showing the electrode for electrical discharge machining according to the second embodiment of the present invention, the electrode 200 for electrical discharge machining according to the second embodiment of the present invention is a method of attaching the copper shell 210 and the copper plate 220 Except for this, it is the same as the electrode 100 for electrical discharge machining according to the first embodiment.

That is, the electrode 200 for electrical discharge machining according to the second embodiment of the present invention has a plurality of vertices of the copper plate 220 after the primary attachment by the copper plate 210 and the soldering unit 230 of the copper plate 220. Secondary fixing by fixing member 140. This is to more firmly attach the copper plate 210 and the copper plate 220, the fixing member 240 is inserted into the copper plate 220 so that the fixing member 240 does not protrude above the upper surface of the copper plate 220. It is preferable that the groove to be formed is previously formed.

Therefore, after the fixing member 240 is inserted into the copper plate member 220, the fixing member 240 is positioned lower than the surface of the copper plate member 220 so as not to interfere with the electric pole function.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and such modifications and modifications belong to the appended claims.

1 is a schematic perspective view showing an electrode for electric discharge machining according to a first embodiment of the present invention;

2 is a photograph taken of the electrode for electrical discharge machining in the first embodiment of the present invention,

3 is a flowchart of a method of manufacturing an electrode for electric discharge machining according to a first embodiment of the present invention;

4 to 6 is a view showing the attachment process of the copper plate and the copper plate according to the first embodiment of the present invention

7 is a view showing an example of attachment of the copper plate and the copper plate according to the first embodiment of the present invention;

8 is a view showing an example in which the copper plate material is incorrectly attached to the copper shell according to the first embodiment of the present invention,

9 and 10 are images showing the surface pattern of the object, the electrode for electrical discharge machining and cemented carbide,

And,

11 is a perspective view showing an electrode for electric discharge machining according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: electrode 110 for electric discharge machining: copper angle

120: copper plate 130: soldering portion

Claims (8)

Copper shell with constant thickness and area; And Copper plate material is the surface pattern of the object is replicated through the sequential electroplating from the object to replicate the surface pattern and attached to the upper surface of the angle; Including; The electrode for electrical discharge machining, wherein the copper plate and the copper angle are attached by soldering. The method of claim 1, The copper plate material, Imprinting the surface pattern of the object to replicate the surface pattern to duplicate the surface pattern of the object to the plastic mold, pre-plating the duplicated plastic mold with metal and then separated to replicate the surface pattern of the object in the metal mold, The electrode for electrical discharge machining, wherein the duplicated metal mold is pre-plated with copper and separated, thereby replicating the surface pattern of the object. 3. The method of claim 2, The sheet resistance value at arbitrary plural points of the said copper plate material is 10.0x10 <^-4> Pa / m <2> (error range +/- 10%), The electrode for electrical discharge machining characterized by the above-mentioned. 3. The method of claim 2, The thickness of the copper plate material is an electrode for electrical discharge machining, characterized in that from 100㎛ to 1mm. (a) preparing a copper shell having a predetermined thickness and area; (b) preparing an object to duplicate the surface pattern; (c) imprinting a surface of the prepared object to replicate the surface pattern of the object in a plastic mold; (d) metallizing the surface of the replicated plastic mold and pre-plating the replicated plastic mold with metal to separate and replicate the surface pattern of the object in a metal mold; (e) pre-plating the replicated metal mold with copper and then separating and replicating the surface pattern of the object on a copper plate; And (f) attaching the replicated copper plate material to the upper surface of the copper shell by soldering; The manufacturing method of the electrode for electrical discharge machining containing a. The method of claim 5, Step (f), And soldering the portion corresponding to the copper plate material of the upper surface of the copper shell and soldering and bonding the edge portion or the entire surface of the lower surface of the copper plate material, thereby attaching the copper plate material to the copper angle. Method of manufacturing the electrode. The method of claim 5, Step (f), A method for manufacturing an electrode for electrical discharge machining, wherein the vertices of the copper plate are fixed with a plurality of fixing members after the soldering. The method of claim 5, Step (f), When the area of the copper plate material is 20 × 40 mm, The amount of lead during soldering for attaching the copper plate to the copper shell is 90 to 110g, the manufacturing method of the electrode for electrical discharge machining.

Images