KR101529236B1 - Electric milling apparatus and its method - Google Patents

Abstract

The present invention relates to a milling apparatus and method of an electric current conduction system for applying a current during milling to improve formability and to prevent a springback phenomenon. A first roll electrode provided in one direction of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece; A second roll electrode provided in the other side of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece; And an electric supply unit for generating a potential difference between the first roll electrode and the second roll electrode so that a current can flow through the workpiece between the first roll electrode and the second roll electrode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric milling apparatus and method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling apparatus and method, and more particularly, to an electric current applying milling apparatus and method for applying current to a material to be processed during milling to improve formability.

Generally, the milling apparatus is an apparatus for cutting the surface of the workpiece by using a milling cutter rotated while being in contact with the workpiece.

On the other hand, when electricity is supplied to the metal at a current density higher than a certain level, unlike the strain caused by the resistance heat, the flow stress of the metal temporarily becomes extremely low even at a high temperature, so that the strength decreases and the elongation increases. The method of forming the work while supplying electric current to the workpiece is referred to as electrification, and in such an electrification forming method, the metallic material as the workpiece is improved in moldability against external force such as tensile force and compressive force, The springback phenomenon which tends to return to the shape tends to be reduced.

The present invention can improve the forming performance of an apparatus using a first roll electrode and a second roll electrode for applying a current at the time of milling, thereby enabling to form a workpiece of high strength material having an embossability, And an object of the present invention is to provide an electric energizing milling apparatus and method which can prevent a springback phenomenon of an electrification system and require no separate annealing process. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided an electric power applying milling apparatus including: a milling cutter for cutting a workpiece; A first roll electrode provided in one direction of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece; A second roll electrode provided in the other side of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece; And an electric supply unit for generating a potential difference between the first roll electrode and the second roll electrode so that a current can flow through the workpiece between the first roll electrode and the second roll electrode.

Further, according to an aspect of the present invention, the milling cutter may be a cutter for rotating the surface of the workpiece.

According to an aspect of the present invention, the first roll electrode or the second roll electrode may be at least one selected from at least one of a top surface, a bottom surface, a left surface, a right surface, have.

According to an aspect of the present invention, when the first roll electrode contacts the upper surface of the member to be processed, the second roll electrode contacts the lower surface of the member to be processed, and the first roll electrode contacts the lower surface The second roll electrode may be in contact with the upper surface of the workpiece.

According to an aspect of the present invention, when the first roll electrode is brought into contact with the left side surface of the member to be processed, the second roll electrode is brought into contact with the right side surface of the member to be processed, When the second roll electrode is in contact with the right side surface, the second roll electrode may be in contact with the left side surface of the workpiece.

According to an aspect of the present invention, the first roll electrode or the second roll electrode includes: a cylindrical body portion having an outer diameter surface in contact with the workpiece and provided so as to be rotatable; And a rotation axis part protruding from a left side surface and a right side surface of the body part and constituting a rotation axis of the body part.

According to an aspect of the present invention, the trunk portion may have a truncated groove on the outer surface.

According to an aspect of the present invention, the body portion and the rotary shaft portion may include a first material portion formed therein; And a second material part having an outer surface formed to surround all or a part of the first material part, the second material part being made of a material different from that of the first material part.

According to an aspect of the present invention, the rotary shaft portion is electrically connected through a ring-shaped bearing electrode electrically connected to the first electric power supply portion, and is rotatably installed.

According to an aspect of the present invention, the rotary shaft portion may be electrically connected to a brush electrode electrically connected to the first electric power supply portion.

The milling apparatus of the electric current conduction type according to the present invention is characterized in that the milling apparatus is provided on the first roll electrode or the second roll electrode and presses the first roll electrode or the second roll electrode in the direction of the workpiece And an elastic member to which a restoring force acts in the direction of the workpiece.

The milling apparatus according to the present invention may be provided on the first roll electrode or the second roll electrode and may contact the surfaces of the first roll electrode or the second roll electrode to separate And a skirt member for supporting the skirt member.

The milling device of the electric current conduction type according to the present invention is characterized in that the milling device is provided on the first roll electrode or the second roll electrode and includes a conductive oil for supplying the conductive oil to the first roll electrode or the second roll electrode And a supply pipe.

According to an aspect of the present invention, the first roll electrode includes: a front right roll electrode contacting the front right side of the workpiece; And a front left roll electrode contacting the front left side of the workpiece, wherein the second roll electrode includes: a rear right roll electrode contacting the rear right side of the workpiece; And a rear left roll electrode contacting the rear left side of the workpiece, wherein the electricity supply unit includes: a first electricity supply unit generating a potential difference between the front right roll electrode and the rear left roll electrode; And a second electric power supply unit generating a potential difference between the front left roll electrode and the rear right roll electrode.

According to another aspect of the present invention, there is provided a milling apparatus for an electric current supply system, including: a milling cutter for cutting a workpiece; A first terminal provided in one direction of the milling cutter and in electrical contact with the workpiece; A roll electrode provided in the other side of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece; And an electric supply unit for generating a potential difference between the first terminal and the roll electrode so that a current can flow through the workpiece between the first terminal and the roll electrode.

According to an aspect of the present invention, there is provided an electric milling method for milling a workpiece, comprising: a first roll electrode installed in one direction of a milling cutter for cutting a workpiece to be in rolling contact with a workpiece; The first roll electrode and the second roll electrode being arranged in the other direction of the first roll electrode and the second roll electrode so as to flow current to the workpiece between the first roll electrode and the second roll electrode, A potential difference is generated between the two roll electrodes so that the workpiece can be cut.

According to some embodiments of the present invention as described above, it is possible to easily process a difficult-to-process workpiece, to mold with a small force, and to avoid the need for annealing, thereby reducing the apparatus capacity and equipment installation cost, Can be greatly improved, and the springback phenomenon can be reduced, so that a high-quality product can be produced. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view conceptually showing an electrically energized milling apparatus according to some embodiments of the present invention.
Fig. 2 is a partial front sectional view showing the first roll electrode of Fig. 1; Fig.
Fig. 3 is a partial front sectional view showing another embodiment of the first roll electrode of Fig. 2; Fig.
Fig. 4 is a partial front sectional view showing still another embodiment of the first roll electrode of Fig. 2; Fig.
5 is a side cross-sectional view conceptually showing an electrically energized milling apparatus according to some embodiments of the present invention.
6 is a plan view conceptually showing an electrically energized milling apparatus according to some embodiments of the present invention.
7 is a plan view conceptually showing an electrically energized milling apparatus according to some embodiments of the present invention.
8 is a plan view conceptually showing an electrically energized milling apparatus according to some embodiments of the present invention.
Fig. 9 is a cross-sectional view showing the first roll electrode or the second roll electrode in Fig. 1;
10 is a cross-sectional view showing another embodiment of the first roll electrode or the second roll electrode of FIG.
11 is a cross-sectional view showing still another embodiment of the first roll electrode or the second roll electrode of Fig.
12 is a perspective view showing a bearing electrode of the first roll electrode or the second roll electrode of Fig. 1;
13 is a perspective view showing the brush electrode of the first roll electrode or the second roll electrode of FIG.
FIG. 14 is a perspective view showing another embodiment of the first roll electrode or the second roll electrode of FIG. 1. FIG.
15 is a perspective view showing another embodiment of the first roll electrode or the second roll electrode of FIG.
FIG. 16 is a perspective view showing another embodiment of the first roll electrode or the second roll electrode of FIG. 1; FIG.
17 is a perspective view conceptually showing an electrically energized milling apparatus according to some embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, The present invention is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a perspective view conceptually showing an electrically energized milling apparatus 100 according to some embodiments of the present invention.

1, an electrifying milling apparatus 100 according to some embodiments of the present invention includes a milling cutter 11, a first roll electrode RR, An electrode LR and a first electric power supply C1.

Here, the workpiece 1 includes a metal having conductivity, and may include, for example, an aluminum material, a magnesium material, a titanium material, a steel material, a copper material, or the like.

The milling cutter 11 cuts the surface of the work 1 while rotating in contact with the surface of the moving work 1. The milling cutter 11 is rotated at a high speed along the rotation axis All kinds of cutters can be applied, for example, a plurality of blades are installed.

The first roll electrode RR may be a terminal provided in the right side of the milling cutter 11 and in rolling contact with the workpiece 1 and in electrical contact with the workpiece 1 .

The second roll electrode LR may be a terminal provided in the left direction of the milling cutter 11 and in rolling contact with the workpiece 1 and in electrical contact with the workpiece 1 .

Here, the first roll electrode RR and the second roll electrode LR may rotate and support the work 1 while idling without applying current to all or a part of the first and second roll electrodes RR and LR.

The first electric power supply unit C1 is connected to the first roll electrode RR so that a current can flow through the work 1 between the first roll electrode RR and the second roll electrode LR, ) And the second roll electrode (LR).

Here, it is possible that the first electric power supply unit (C1) selectively supplies at least one of at least AC, DC, pulse wave and combinations thereof. For example, the first electric power supply part C1 may be provided between the first roll electrode RR and the second roll electrode LR depending on the type of the work 1, The current can be supplied to the first roll electrode RR and the second roll electrode LR so that the density of the current has approximately 20 to 100 A / mm ² . Such a current density may be a current density that enables the current-carrying process to be performed so that the internal structure of the workpiece 1 is changed to increase the elongation while decreasing the strength. Therefore, during the movement of the workpiece 1, the first electric power supply unit C1 is connected to the first roll electrode RR using the first roll electrode RR and the second roll electrode LR, The work 1 can be formed using a low forming force by continuously flowing a current of a current density capable of being energized to the work 1 between the second roll electrode LR and the second roll electrode LR. In addition, since the work 1 passes between the first roll electrode RR and the second roll electrode LR, an annealing effect in which the stress inside the metal is reduced due to a high current density can be exhibited.

At this time, the first roll electrode RR and the second roll electrode LR are brought into rolling contact with the work 1 to minimize friction, and at the same time, face contact is made not by point contact, The electric power supply efficiency can be greatly increased, and the work 1 can be protected without damaging the work 1.

Fig. 2 is a partial front sectional view showing the first roll electrode RR in Fig. 1, Fig. 3 is a partial front sectional view showing another embodiment of the first roll electrode RR in Fig. 2, Sectional view showing still another embodiment of the first roll electrode RR.

2, the first roll electrode RR or the second roll electrode LR may be in contact with the upper surface 1 - 1 of the work 1, As shown in FIG. 4, and can be in contact with the left side 1-3 and the right side 1-4, as shown in FIG.

5 is a side cross-sectional view conceptually showing an electrically energized milling apparatus 200 according to some embodiments of the present invention.

5, when the first roll electrode RR is brought into contact with the upper surface 1 - 1 of the work 1, the second roll electrode LR contacts the upper surface 1 - And can be brought into contact with the lower surface 1-2. Therefore, when the thickness of the work 1 is thick, the direction of the current can flow diagonally from the front upper portion to the rear lower portion so that the current can be evenly distributed.

Conversely, although not shown, when the first roll electrode RR is brought into contact with the lower surface 1-2 of the work 1, the second roll electrode LR contacts the upper surface of the work 1 (1-1).

6 is a plan view conceptually showing an electrically energized milling apparatus 300 according to some embodiments of the present invention.

6, when the first roll electrode RR is brought into contact with the left side face 1-3 of the work 1, the second roll electrode LR contacts the work 1, To the right side surface (1-4). Therefore, when the width of the work 1 is wide, the direction of the current can flow in the diagonal direction from the front left to the rear right so that the current can be evenly distributed.

Conversely, although not shown, when the first roll electrode RR is brought into contact with the right side surface 1-4 of the work 1, the second roll electrode LR is moved to the left side of the work 1 It is possible to contact the surface (1-3).

FIG. 7 is a side cross-sectional view conceptually showing an electrically energized milling apparatus 400 according to some embodiments of the present invention, and FIG. 8 is a cross-sectional view of an electrically energized milling apparatus 500 according to some embodiments of the present invention. Fig.

As shown in FIGS. 7 and 8, a first-first electric supply unit (not shown) for supplying electricity to the first roll electrode RR1 and the second roll electrode LR1 so that the direction of the current can be crossed in an X- The first roll electrode RR2 and the second roll electrode LR2 can be made to flow evenly over a larger area by using the first and second rollers C1-1 and C1-2, It is also possible.

That is, FIG. 7 shows a state in which the direction of the current flows along the arrangement line K2 and the arrangement line K3 forming the inclination angle A1 with the intersection angle A2 with respect to the milling cutter 11, A first roll electrode RR1, a second roll electrode LR1, a first roll electrode RR2, and a second roll electrode LR2. Here, the intersection angle A2 may be a right angle, and the inclination angle A1 may be 45 degrees. In addition, it can be installed at various angles.

Thus, as shown in Fig. 7, the shape of the current can cross in an X-shape from the front right to the rear left and from the front left to the rear right, and Fig. 8 shows a cross- The first roll electrode RR1 and the second roll electrode LR1 and the first roll electrode RR2 and the second roll electrode LR2 are disposed on the left side 1-3 and the right side 1-4 of the work 1, Can be contacted.

9 is a cross-sectional view showing the first roll electrode RR or the second roll electrode LR in Fig.

9, the first roll electrode RR or the second roll electrode LR has an outer diameter surface 20a to be in contact with the work 1, and is provided so as to be rotatable The body 20 has a cylindrical body 20 and a rotary shaft 21 which is formed to protrude from the left side 20b and the right side 20c of the body 20 and forms a rotary shaft 21a of the body 10, ). Accordingly, the body 10 can be rotated in the rolling contact with the work 1 on the basis of the rotary shaft 21.

10 is a cross-sectional view showing another embodiment of the first roll electrode RR or the second roll electrode LR in Fig.

10, the body portion 20 may have a trough 22 formed on the outer surface 20a to separate foreign objects into the troughs 22 and to reduce the weight of the body portion 20 Alternatively, although not shown, it is possible to actively cope with various workpieces 1 by adjusting the spacing of the row grooves 22 using screw grooves or the like.

11 is a cross-sectional view showing another embodiment of the first roll electrode RR or the second roll electrode LR in Fig.

11, the body portion 20 and the rotary shaft portion 21 may be formed of a first material portion 20-1 and a second material portion 20b, which are formed on the inside in consideration of economy and conductivity, And a second material portion 20-2 that is formed of a material different from that of the first material portion 20-1. The second material portion 20-2 may have an outer surface to surround all or a part of the first material portion 20-1. For example, the first material portion 20-1 may be made of a material having a high frictional resistance or a low frictional coefficient, for example, a carbon coating material, and the second material portion 20-2 May be made of a material having high strength, for example, various kinds of steels and the like.

12 is a perspective view showing the bearing electrode 30 of the first roll electrode RR or the second roll electrode LR in Fig.

12, the rotary shaft portion 21 is electrically connected through a ring-shaped bearing electrode 30 electrically connected to the first electric power supply portion C1 so as to enable stable energization, The rotation can be freely installed.

13 is a perspective view showing the brush electrode 40 of the first roll electrode RR or the second roll electrode LR in Fig.

13, the rotary shaft portion 21 may be electrically connected to the brush electrode 40 electrically connected to the first electricity supplying portion C1 so as to enable stable energization.

FIG. 14 is a perspective view showing another embodiment of the first roll electrode RR or the second roll electrode LR in FIG. 1; FIG.

As shown in FIG. 14, an electrifying milling apparatus according to some embodiments of the present invention is provided on the first roll electrode RR or the second roll electrode LR, The elastic member 50 may be provided with a restoring force in the direction of the workpiece 1 so as to press the electrode RR or the second roll electrode LR toward the workpiece 1. [ Therefore, even when the workpiece 1 has irregularities, various surfaces, or foreign matter, the terminal contactability can be improved by utilizing the restoring force of the elastic member 50.

Fig. 15 is a perspective view showing another embodiment of the first roll electrode RR or the second roll electrode LR in Fig. 1. Fig.

As shown in FIG. 15, an electrifying milling apparatus according to some embodiments of the present invention is provided on the first roll electrode RR or the second roll electrode LR, And may further include a skirt member 60 for contacting the surface of the electrode RR or the second roll electrode LR to separate the foreign matter 2 therefrom. Therefore, it is possible to improve the electrical contact efficiency by removing the rust on the surface of the terminal including the foreign matter 2.

16 is a perspective view showing another embodiment of the first roll electrode RR or the second roll electrode LR in Fig.

16, an electrifying milling apparatus according to some embodiments of the present invention is provided on the first roll electrode RR or the second roll electrode LR, And a conductive oil supply pipe 70 for supplying the conductive oil 3 to the electrode RR or the second roll electrode LR. Therefore, the electrical contact efficiency can be improved by using the conductive oil 3.

17 is a perspective view conceptually showing an electrically energized milling apparatus 600 according to some embodiments of the present invention.

17, an electrically energized milling apparatus 600 according to some embodiments of the present invention includes a milling cutter 11 for cutting a workpiece 1, A first terminal (80) provided in one direction and electrically in contact with the work (1), a second terminal (80) provided in the other direction of the milling cutter (11) and in rolling contact with the work A roll electrode LR which is in electrical contact with the work 1 and a second terminal 80 which is connected to the first terminal 80 and the roll electrode LR, And an electric supply unit C1 for generating a potential difference between the roll electrode LR and the roll electrode LR.

Here, the first terminal 80 may be a clamp, or any type of terminal that is in electrical contact with the work 1, such as a welded portion or a connector.

Therefore, the first terminal 80 is fixed to one side of the workpiece 1, and the roll electrode LR can supply current while rolling on the other side of the workpiece 1.

According to another aspect of the present invention, there is provided an electric power applying milling method using an electric power applying milling apparatus including a first roll electrode installed in one direction of a milling cutter for cutting a workpiece to be in rolling contact with a workpiece, And a second roll electrode provided on the other side of the milling cutter and in rolling contact with the workpiece so that a current can flow through the workpiece between the first roll electrode and the second roll electrode, And a potential difference is generated between the second roll electrodes to cut the workpiece.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: Workpiece
1-1: Top surface
1-2: When
1-3: Left side
1-4: Right side
2: Foreign matter
3: Conductive oil
11: Milling cutter
RR, RR1, RR2: first roll electrode
LR, LR1, LR2: the second roll electrode
C1: first electric supply portion
C1-1: 1-1 electrical supply unit
C1-2: First and second electric supply units
100, 200, 300, 400, 500, 600: Electrical energization milling device
20:
20a: outer diameter face
20b: left side
20c: Right side
21:
21a:
22: Shackle
20-1: First material part
20-2: second material part
30: bearing electrode
40: Brush electrode
50: elastic member
60: skirt member
70: Conductive oil supply pipe
80: first terminal

Claims (16)

A milling cutter for cutting a workpiece;
A first roll electrode provided in one direction of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece;
A second roll electrode provided in the other side of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece;
An electric supply unit for generating a potential difference between the first roll electrode and the second roll electrode so that a current can flow through the workpiece between the first roll electrode and the second roll electrode; And
A conductive oil supply pipe installed at the first roll electrode or the second roll electrode and supplying conductive oil to the first roll electrode or the second roll electrode;
The milling device comprising: The method according to claim 1,
Wherein the milling cutter is a cutter for rotating the surface of the workpiece. The method according to claim 1,
Wherein the first roll electrode or the second roll electrode includes:
Wherein at least one of at least an upper surface, a lower surface, a left surface, a right surface, and a combination thereof is selected and contacted with the work. The method according to claim 1,
When the first roll electrode is in contact with the upper surface of the processing member, the second roll electrode is in contact with the lower surface of the processing member, and when the first roll electrode is in contact with the lower surface of the processing member, Is in contact with the upper surface of the workpiece. The method according to claim 1,
When the first roll electrode is in contact with the left side surface of the workpiece, the second roll electrode is in contact with the right side surface of the workpiece, and when the first roll electrode is in contact with the right side surface of the workpiece, And the electrode is in contact with the left side of the workpiece. The method according to claim 1,
Wherein the first roll electrode or the second roll electrode includes:
A cylindrical body portion having an outer diameter surface in contact with the workpiece and provided so as to be rotatable; And
A rotation axis part protruding from a left side surface and a right side surface of the body part and constituting a rotation axis of the body part;
The milling device comprising: The method according to claim 6,
Wherein the body portion has a trench formed in the outer diameter surface thereof. The method according to claim 6,
The body portion and the rotary shaft portion
A first material portion formed in the inside; And
A second material part having an outer surface formed to surround all or a part of the first material part and formed of a material different from that of the first material part;
The milling device comprising: The method according to claim 6,
Wherein the rotary shaft portion is electrically connected through a ring-shaped bearing electrode electrically connected to the first electric power supply portion, and is rotatably installed. The method according to claim 6,
Wherein the rotary shaft portion is electrically connected to a brush electrode electrically connected to the first electric power supply portion. The method according to claim 1,
An elastic member provided on the first roll electrode or the second roll electrode and having a restoring force in the direction of the workpiece so as to press the first roll electrode or the second roll electrode in the direction of the member to be processed;
Further comprising an electric milling device for milling the electric milling device. The method according to claim 1,
A skirt member installed on the first roll electrode or the second roll electrode and contacting a surface of the first roll electrode or the second roll electrode to separate foreign matters;
Further comprising an electric milling device for milling the electric milling device. delete The method according to claim 1,
The first roll electrode includes: a front right roll electrode contacting the front right side of the workpiece; And a front left roll electrode contacting the front left side of the workpiece,
The second roll electrode includes: a rear right roll electrode contacting the rear right side of the workpiece; And a rear left roll electrode contacting the rear left side of the workpiece,
Wherein the electric supply unit includes: a first electric supply unit generating a potential difference between the front right roll electrode and the rear left roll electrode; And a second electric supply unit generating a potential difference between the front left roll electrode and the rear right roll electrode. A milling cutter for cutting a workpiece;
A first terminal provided in one direction of the milling cutter and in electrical contact with the workpiece;
A roll electrode provided in the other side of the milling cutter and in rolling contact with the workpiece and in electrical contact with the workpiece;
An electric supply unit for generating a potential difference between the first terminal and the roll electrode so that a current can flow through the member to be processed between the first terminal and the roll electrode; And
And a conductive oil supply pipe provided on the roll electrode and supplying a conductive oil to the roll electrode. A first roll electrode provided in one direction of a milling cutter for cutting a workpiece to be in rolling contact with a workpiece and a second roll electrode provided in the other direction of the milling cutter and in rolling contact with the workpiece, The first roll electrode and the second roll electrode are supplied with conductive oil so that a current can flow through the workpiece between the first roll electrode and the second roll electrode and the conductive oil is supplied between the first roll electrode and the second roll electrode, To generate a potential difference to cut the workpiece.

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