KR101746665B1

KR101746665B1 - Holding device for processing of electrode

Info

Publication number: KR101746665B1
Application number: KR1020160020769A
Authority: KR
Inventors: 김두진
Original assignee: (주) 엔씨비
Priority date: 2016-02-22
Filing date: 2016-02-22
Publication date: 2017-06-27

Abstract

The electrode fixing device for electric discharge machining according to the present invention includes a magnetic plate 120 having a magnetic property on an upper surface thereof and a plurality of bed guide pins And a bottom surface of the bottom plate is magnetically coupled to the magnetic plate 120 of the bed 100. An electrode receiving portion 220 for receiving the working electrode is formed on the bottom of the bed 100, An electrode jig 200 in which a plurality of coupling holes 240 to be inserted into the bed guide pin 140 are formed and an upper surface thereof is connected to an electric discharge machine holder and a bottom surface of the electrode jig 100 And a discharging guide pin 340 inserted into the coupling hole 240 of the electrode jig 100 is installed on the bottom surface so as to protrude from the bottom surface of the electrode jig 100. [ The discharge jig 300 .

Description

TECHNICAL FIELD [0001] The present invention relates to an electrode fixing device for an electric discharge machining,

The present invention relates to an electrode fixing device for electric discharge machining for easily fixing a working electrode in the production of a metal mold.

Generally, electric discharge machining is a method of precisely machining materials that are hard to process by NC milling, materials with extremely high hardness such as cemented carbide, quenched high speed steel, heat resistant steel, etc. Especially, as the mold industry develops, Is widely used in the processing of molds.

In this electric discharge machining, the workpiece is first roughly machined into a certain shape, and the electrode is machined to correspond to the machined shape of the workpiece.

At this time, the electrode is processed by a CNC machine tool or the like, and the thus processed electrode is fixed on a holder of an electric discharge machine, and the workpiece is precisely processed in the shape of the electrode by discharging generated in contact with the workpiece in the electrolytic solution will be.

In such an electric discharge machining, the shape of the electrode is very diverse, and it is required to frequently replace the electrode in a desired shape.

Specifically, the working electrode is set on a bed such as a CNC machine tool, and the working electrode is set so as to match a machining reference point of the machining electrode, and then fixed and installed with a separate clamping device. (Reference point) of the electric discharge machining apparatus and the working electrode is set, and then the electric discharge machining is performed.

Accordingly, the above-mentioned electrode is required to set the machining reference point in the CNC machine tool and the electric discharge machining machine, so that the workability is lowered. Moreover, it is very difficult to uniformly set the machining reference point every time. Resulting in degraded problems.

For example, an electrode for a working electrode is processed by a CAD / CAM method and an NC milling method to produce a non-cut portion through an end mill.

Accordingly, conventionally, the working electrode is fixed to the NC milling apparatus and the electric discharge machining apparatus by using a vise or an adhesive, and it takes a considerable effort and time to set the parallelism and the position of the workpiece at the time of fixation, In fact.

Particularly, when NC processing is performed by fixing the objects to be processed one by one on a vise, it takes a considerable time to set the position of the object to be processed, and the productivity is low with time, There is a problem that it is difficult to set the parallelism or position of the object to be processed and the number of errors of the worker is frequently increased, resulting in a high possibility of production of defective products.

On the other hand, the clamping device of the electrode for electric discharge machining disclosed in Korean Utility Model Publication No. 0434124 (Dec. 15, 2006), which is a prior art, discloses a clamp for fixedly mounting electrodes for electric discharge machining and electric discharge machining. And a mounting hole provided on the electrode holder of the electrical discharge machining apparatus and provided with a machining electrode is selectively engaged with the fixed joint so that the work for mounting and mounting can be facilitated.

However, according to the above-described prior art, there is a problem that the configuration is very complicated and the product cost is increased. That is, in order to fix a mounting hole provided with one electrode, fixed fastening holes corresponding thereto must be provided individually, and the individual fastening holes must be respectively installed on the electrode holder of the processing bed and the electric discharge machining device. There is a problem in that the manufacturing cost is increased and the cost is increased because the fixed bed is installed in the processing bed and the electric discharge machine.

In addition, the number of the working electrode required for the electric discharge machining varies from several tens to several hundreds, and the size and the shape of each electrode are different from each other. Therefore, the problem of rising manufacturing costs as described above becomes larger. Therefore, the conventional technique described above has a problem in that it is used only for machining a small machined electrode, and the machined electrode having a relatively large size has a problem that the electrode must be set manually as in the conventional case.

In addition, since the mounting hole, to which the processing electrode is fixed, is attached to the processing bed and the fixed connection hole provided in the electric discharge machining apparatus, it is necessary to fasten and separate the mounting hole through a screw connection in order to separate them. There is a problem that a plurality of electrodes having various sizes are simultaneously fixed and it is difficult to work.

Korea Registered Utility Model No. 0434124 (December 15, 2006)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method and apparatus for quickly and easily performing parallelism and positioning of a working electrode, So as to reduce the manufacturing cost, and to provide an electrode fixing device for electric discharge machining.

The objects of the present invention are not limited to those mentioned above, and other objects not mentioned may be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an electrode fixing device for electric discharge machining, comprising: a magnetic plate having a magnetic property formed on an upper surface thereof; A bed in which a plurality of bed guide pins are installed so as to protrude; An electrode jig in which a bottom surface is magnetically coupled with a magnetic plate of the bed, an electrode receiving portion is formed in an upper portion to receive the working electrode, and a plurality of coupling holes are formed in a bottom surface of the coupling portion; And a fixing switch connected to the upper surface of the electric discharge machining apparatus holder and adapted to apply or cut off the magnetic force for coupling the bottom surface of the electrode jig to the bottom surface of the electrode jig by rotation of the user on one side, And a discharge jig to which a discharge guide pin inserted into the coupling hole of the electrode jig protrudes.

The upper surface of the magnetic plate has a lattice structure in which a unit lattice of a square is arranged in a plurality of rows and columns, and the bed guide pin is installed at the center of the unit lattice.

The lattice structure has a structure in which a unit set consisting of nine unit lattices with the unit lattice having 3 rows and 3 columns is repeatedly arranged. At this time, according to an embodiment of the present invention, the bed guide pins arranged in the unit set include one of the nine unit lattices of the unit set, one in the center central unit lattice, one each in the outermost unit lattice of each side A total of five are installed. According to another embodiment of the present invention, in the bed guide pin arranged in the unit set, one of the nine unit lattices of the unit set is provided in the middle central unit lattice, one of the outermost unit lattices of the four sides, One in each outermost unit grid, and three in total.

The coupling holes formed in the electrode jig are formed with at least five coupling holes corresponding to the five or three bed guide pins arranged in the unit set.

Five bed guide pins provided in the discharge jig are provided corresponding to the five coupling holes formed in the electrode jig or four corresponding to the four outermost coupling holes out of the five coupling holes.

The electrode jig has a plurality of bolt holes formed on both sides of an upper portion surrounding the electrode receiving portion, and a bolt for fixing the working electrode seated on the electrode receiving portion is coupled to the bolt hole.

According to the present invention, it is possible to quickly and easily set a plurality of working electrodes having various sizes, and as a result, the productivity of work can be increased.

In addition, the electrode jig provided with the working electrode can be magnetically coupled to the bed and the discharge jig, so that the mounting and dismounting can be performed easily and quickly, resulting in an increase in work productivity.

In addition, it is possible to appropriately arrange the guide pins on the bed so as to have a predetermined pattern and optimally design the electrode jig to be connected thereto so as to have expandability so as to fix and process the electrodes for various sizes, , And the structure is also simple, so that the manufacturing cost can be remarkably reduced.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a perspective view schematically showing the overall configuration of an electrode fixing device for electric discharge machining according to an embodiment of the present invention,
FIG. 2 is a view showing a state in which one electrode jig is separated from a bed in FIG. 1;
3 is a side sectional view of Fig. 1,
4 is a bottom perspective view of a discharge jig in an electrode fixing device for electric discharge machining according to an embodiment of the present invention,
Figure 5a is a plan view of a magnetic plate formed on the top surface of the bed of Figure 1 according to one embodiment of the present invention,
FIG. 5B is a plan view of a magnetic plate according to another embodiment of the present invention, FIG.
6 is a view showing various embodiments of an electrode jig among electrode fixation devices for electric discharge machining according to an embodiment of the present invention,
7 is a use state diagram for explaining NC machining of the electrode fixation device for electric discharge machining according to the embodiment of the present invention,
8 is a use state diagram for explaining electric discharge machining of the electrode fixation apparatus for electric discharge machining according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Hereinafter, an electrode fixing device for electric discharge machining according to embodiments of the present invention will be described with reference to the drawings.

1 to 3, an electrode fixing apparatus for electric discharge machining according to an embodiment of the present invention includes a bed 100, an electrode jig 200, and a discharge jig 300. The electrode jig 200 is fixed to the bed 100 during the NC machining process and is separated from the bed 100 after the NC machining process. So that the electric discharge machining is performed.

The bed 100 is mounted on a CNC machine tool and is formed in a hexahedron shape. A magnetic plate 120 is formed on an upper surface of the magnetic plate 120. A plurality of bed guide pins 140 are formed on the upper surface of the magnetic plate 120, As shown in Fig.

The magnetic plate 120 is configured to have magnetism and functions to fix the plurality of electrode jigs 200 to be seated. The magnetic plate 120 may be made of a permanent magnet or may have a built-in permanent magnet, and the permanent magnet is not limited to a specific structure or material, but is inexpensive and can be used at a temperature Ferrite magnets may be employed.

The magnetic plate 120 has a lattice structure in which square unit lattices whose top surfaces have a certain size are arranged in a plurality of rows and columns. The bed guide pin 140 is installed at the center of the unit grid. The bed guide pin 140 serves to guide the electrode jig 200 to be easily coupled to the bed 100. Since the bed guide pin 140 is installed centrally in the unit grid, 100), the parallelism and the machining position are automatically set. The bed guide pins 140 are arranged to have a predetermined interval and a pattern, which will be described later.

The electrode jig 200 serves to fix the electrode and has a hexahedral shape as a whole, and is detachably coupled to the upper surface of the bed 100, that is, the magnetic plate 120. That is, the electrode jig 200 facilitates detachment and attachment by magnet coupling to the bed 100, and the electrode jig 200 is formed of a metal material by magnet coupling with the bed 100, Can be inserted.

The electrode jig 200 has an electrode receiving portion 220 formed on an upper surface thereof and a plurality of coupling holes 240 (see FIG. 6) formed on a bottom surface thereof.

The electrode holder 220 has a receiving groove for receiving the electrode on the upper surface of the electrode jig 200 so that the electrode is seated on the upper surface of the electrode holder 220.

A bolt hole 260 is formed in an upper side portion of the electrode jig 200 to fix the electrode to the electrode receiving portion 220 and a bolt 280 is fastened to the bolt hole 260. The bolt hole 260 is formed on at least one side of the side surface of the clamp 220 along the horizontal direction.

A plurality of bolt holes 260 are formed on both sides of the upper portion of the electrode jig 200 surrounding the electrode receiving portion 220. The bolts 280 are fastened to the bolt holes 260 to be seated in the electrode receiving portion 220 Thereby firmly fixing the electrode. That is, when the electrode is seated in the electrode receiving part 220, the bolt 280 is fastened to the bolt hole 260 and the bolt 280 is rotated by the bolt hole 260, The electrode is more firmly fixed by pressing the working electrode while being in contact with the side surface of the electrode, so that the electrode can be maintained in a more firmly fixed state.

The coupling hole 240 is formed on the bottom surface of the electrode jig 200, and a bed guide pin 140 projecting from the top surface of the bed 100 is inserted. The coupling holes 240 are formed in a plurality of shapes, and are preferably formed to correspond to the intervals of the bed guide pins 140 disposed on the bed 100. Hereinafter, the specific structure of the bed guide pin 120 and the coupling hole 240 will be described.

The electrode used in the machining operation has dozens to hundreds of kinds, and thus has a very wide variety of sizes. As described above, according to the prior art, only a small number of electrodes can be processed. This is because the electrode jig (attachment port) for fixing the electrode and the fixed coupling port provided in the bed and the electric discharge machining apparatus have a one-to-one structure, so that there is no expandability. According to the present invention, the electrode jig coupled to the bed has an expandable structure.

5A and 5B, according to an embodiment of the present invention, the lattice structure formed on the upper surface of the magnetic plate 120 is arranged in a structure of unit lattices of 18 rows (horizontal) .times.12 columns (vertical). Here, a total of 24 lattice structures (6 rows x 4 columns) formed on the upper surface of the magnetic plate 120 are defined as nine unit lattices of 3 rows x 3 columns as one set As shown in FIG.

Referring to FIG. 5A, a total of five bed guide pins 140 are disposed in one unit set 150. That is, of the nine unit lattices of the unit set, one is placed in the unit lattice in the center, and four are arranged in each outermost unit lattice of each side, and a total of five units are arranged.

Referring to FIG. 5B, a total of three bed guide pins 140 are disposed in one unit set 150. That is, of the nine unit lattices of the unit set, one is arranged in the unit lattice in the center, and two are arranged in the outermost of the opposite diagonal lines of the outermost unit lattices of the four sides, three in total.

6, various examples according to the size of the electrode jig 200 are shown.

6 (a) shows the electrode jig having the smallest basic structure. As described above, the lattice structure of the bed 100 has a structure in which a unit set consisting of nine unit lattices is repeated, and five or three bed guide pins 140 are disposed in this one unit set, Five coupling holes 240 are formed on the bottom surface of the electrode jig 200 so as to correspond thereto. It is preferable that five coupling holes 240 are formed on the bottom surface of the electrode jig 200 even if three bed guide pins 140 are disposed in one unit set 150. This is because, Since the direction of the coupling of the first and second electrodes can be rotated by 180 °.

6 (b) to 6 (d) show that the electrode jig increases from the basic structure of FIG. 6 (a) as the electrode size increases. On the other hand, the width of the electrode jig 200 can be increased upwards and / or downwards and / or leftwards or rightwards, but it can not be increased vertically or horizontally due to the bed guide pins arranged in neighboring unit sets. Therefore, the electrode jig 200 of FIGS. 6 (b) and 6 (c) is enlarged in size up and down and / or left and right so as not to touch the bed guide pin arranged in the neighboring unit set. 6 (d) shows a larger electrode jig 200 than (b) and (c). In this case, the bed guide pin 140 disposed in the neighboring unit set can be inserted, (240) is further formed. That is, the coupling holes 240 formed in the electrode jig 200 are basically formed with five coupling holes 240 corresponding to five or three bad guide pins arranged in the unit set of the grid structure The structure and spacing of the five coupling holes 240 are the same), and additional coupling holes 240 may be further formed depending on the size of the electrode jig 200.

Referring to FIG. 4 again, the discharge jig 300 may be used to perform the electrical discharge machining of the electrode that has been NC-processed when the NC machining of the electrode fixed to the electrode jig 200 disposed on the bed 100 is completed And serves to fix the electrode jig 200.

The discharge jig 300 has an upper portion connected to the conventional discharge machine holder and includes a fixed switch 310 and a discharge guide pin 340.

The fixed switch 310 is provided on one side of the discharge jig 300 so that the bottom surface of the discharge jig 300 is rotated or turned by a user to apply or cut off magnetic force for magnet coupling with the bottom surface of the electrode jig 200 . That is, a magnetic body is provided in the inside of the discharge jig 300, and the magnetic force is applied to the bottom surface of the discharge jig 300 by the movement of the stationary switch 310. For example, the fixed switch 310 is provided on one side of the discharge jig 300 in the form of a rotary switch. When the user rotates the magnetic jig embedded in the discharge jig 300, The electrode jig 200 can be easily and quickly attached to and detached from the fixed electrode jig 200 by applying or blocking a magnetic force for fixing the electrode jig 200. [

The discharge guide pin 340 is for guiding the electrode jig 200 to be fixed to the discharge jig 300 and is provided on the bottom surface of the discharge jig 300 so as to be inserted into the coupling hole 240 of the electrode jig 200. . According to the embodiment of the present invention, four discharge guide pins 340 are provided, but the present invention is not limited thereto and four or five discharge guide pins 340 may be installed. That is, five electrode fingers 200 are basically provided with five electrode fingers (one center and four fingers), so that five discharge guide pins 340 may be provided at corresponding positions, There may be only four discharge guide pins 340 as shown in Fig.

6 (d), the electrode jig 200 having a large size is additionally formed in addition to the four coupling holes. However, only the four basic coupling holes 240 are provided with the discharge guide pins 340 The electrode jig 200 can be fixed to the discharge jig 300 without being affected by the type of the electrode jig regardless of the type of the electrode jig. .

Hereinafter, the operation of the electrode fixing device for electric discharge machining according to the embodiment of the present invention will be described.

The electrodes having different sizes required for processing are respectively placed in the electrode receiving portions 220 of the electrode jigs 200 having different sizes. Next, the bolts 280 are fastened to the bolt holes 260 of the electrode jig 200 to fix the electrodes seated in the electrode receptacle 200.

When the electrode is fixed to the electrode jig 200, the electrode jig 200 must be fixed on the bed 100 in order to perform NC processing of the electrode. At this time, And the electrode jig 200 is placed on the magnetic plate 120 on the upper surface of the bed 100 by sandwiching the coupling hole 240 of the jig 200 and the electrode jig 200 by the magnetic force, (See Fig. 1).

By positioning the plurality of electrode jigs 200 on the upper surface of the magnetic plate 120, the positioning and setting operation is automatically completed. Accordingly, a plurality of electrodes having different sizes can be quickly and conveniently fixed from the bed 100 by using a plurality of electrode jigs 200 having different sizes from each other, It is possible to arrange the electrode jigs 200 so that the electrode jigs 200 correspond to the coordinate area set in advance for the NC machining so that the positioning of the electrodes and the convenience of setting the electrodes can be improved.

Then, as shown in Fig. 7, an NC machining operation is performed on the working electrode.

When the NC machining operation is completed, the electrode jig 200 is separated from the bed 100 by applying a suitable force to the hand, and the bottom surface of the separated electrode jig 200 is positioned to correspond to the bottom surface of the discharge jig 300.

The electrode jig 200 is coupled to the discharge jig 300 by inserting the discharge guide pin 340 into the coupling hole 240 and then the rotation of the fixing switch 310 is applied to the bottom surface of the discharge jig 300 So that the electrode jig 200 is magnetically coupled to the discharge jig 300 to be firmly fixed.

When the electrode jig 200 is coupled and fixed to the discharge jig 300, the electrode fixed to the electrode jig 200 as shown in FIG. 8 is contacted with the workpiece immersed on the separate electrolyte upon driving of the holder of the electric discharge machine An electric discharge machining can be performed.

According to the present invention as described above, it is possible to quickly and easily fix a plurality of working electrodes having various sizes, and it is possible to quickly and easily perform the parallelism and the positioning of the working electrode in the NC machining or the discharge machining of the working electrode, There is an advantage that work productivity can be improved.

In addition, since the bed and the discharge jig have a magnetic body and the electrode jig provided with the working electrode is magnetically coupled to the bed and the discharge jig, the structure of the whole apparatus is simple, and the mounting and dismounting can be made easily and quickly, Is significantly reduced and productivity of work is increased.

In addition, the electrode jig with the guide pins arranged on the bed so as to have a predetermined pattern and the coupling jig having the coupling holes are optimally designed so as to have expandability so as to fix and process There is an advantage to be able to do.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100. Bed 120. Magnetic Plate
140. Bed guide pin 200. Electrode jig
220. Electrode receiving portion 240. Coupling hole
260. Bolt Ball 280. Bolt
300. Discharge jig 310. Fixed switch
340. Discharge guide pin

Claims

A plurality of bed guide pins protruding from the top surface of the magnetic plate and having a predetermined interval and a pattern formed on the top surface of the magnetic plate;
An electrode jig in which a bottom surface is magnetically coupled with a magnetic plate of the bed, an electrode receiving portion is formed in an upper portion to receive the working electrode, and a plurality of coupling holes are formed in the bottom surface to be inserted into the bed guide pin; And
Wherein the upper surface of the electrode jig is connected to an electric discharge machine holder and a fixed switch is provided on one side of the lower surface to apply or cut off magnetism for coupling the lower surface of the electrode jig to the magnet by a user's rotation operation, And a discharge jig pin inserted into a coupling hole of the discharge jig is protruded from the discharge jig.

The method according to claim 1,
The upper surface of the magnetic plate has a lattice structure in which square unit lattices are arranged in a plurality of rows and columns,
And the bed guide pin is installed at the center of the unit grid.

3. The method of claim 2,
The lattice structure has a structure in which a unit set of nine unit lattices having three rows and three columns of the unit lattices is repeatedly arranged,
Wherein the bed guide pins arranged in the unit set are provided with a total of five, one for each of the nine unit lattices of the unit set, and one for each of the outermost unit lattices of each of the four sides. Fixing device.

3. The method of claim 2,
The lattice structure has a structure in which a unit set of nine unit lattices having three rows and three columns of the unit lattices is repeatedly arranged,
The bed guide pins arranged in the unit set include one in each of the nine unit lattices of the unit set, one in the middle central unit lattice, and one in the outermost unit lattice facing diagonally in the outermost unit lattices in all four directions And the electrode is fixed to the electrode.

The method according to claim 3 or 4,
Wherein at least five coupling holes corresponding to the five or three bed guide pins arranged in the unit set are formed in the coupling holes formed in the electrode jig.

6. The method of claim 5,
And five discharge guide pins provided on the discharge jig are provided corresponding to the five coupling holes formed in the electrode jig or four corresponding to the four outermost coupling holes out of the five coupling holes are provided Electrode holding device for discharge machining.

The method according to claim 1,
Wherein the electrode jig includes a plurality of bolt holes formed on both sides of an upper portion surrounding the electrode receiving portion and a bolt for fixing the working electrode seated in the electrode receiving portion is coupled to the bolt hole. .