KR20140136815A - Electric drawing apparatus of wire and its method - Google Patents

Abstract

The present invention relates to an electric wire drawing device and a method thereof, wherein a current is applied at the time of the cold drawing of a wire so as to improve formability and prevent the spring back phenomenon. The electric pipe drawing device can comprise: a first drawer for passing a moving workpiece in the shape of a wire and carrying out drawing-forming of the workpiece; a front roll electrode coming into rolling contact with the workpiece before the workpiece passes through the first drawer and electrically contacting the workpiece; a rear roll electrode coming into rolling contact with the workpiece after the workpiece passes through the first drawer and electrically contacting the workpiece; and a first electricity supply part for generating a potential difference between the front roll electrode and the rear roll electrode such that the current is applied to the workpiece between the front roll electrode and the rear roll electrode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric wire drawing apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for drawing a wire rod of an electric conduction type, and more particularly, to an apparatus and method of drawing a wire rod of an electric current conduction type by applying current to a workpiece during cold drawing of the wire rod .

In general, a wire drawing apparatus is a device having a die that applies a pressure to a workpiece by passing a workpiece in the form of a moving wire through a die hole, and can be used in the case of making a coarse and coarse wire rod with a thin and smooth wire rod have.

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 a device by using a front roll electrode and a rear roll electrode for applying a current at the time of cold drawing of a wire rod to make it possible to form a workpiece of high strength having an embossability, And it is an object of the present invention to provide a wire drawing apparatus and method of an electric current conduction system which can prevent a springback phenomenon of an electric wire, and does not require a 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 electrified wire drawing apparatus including a first ejector for passing a workpiece in the form of a moving wire and drawing and forming the workpiece; A front roll electrode in rolling contact with the workpiece prior to passing through the first drawer and in electrical contact with the workpiece; A rear roll electrode in rolling contact with the workpiece after passing through the first drawer and in electrical contact with the workpiece; And a first electric power supply unit for generating a potential difference between the front roll electrode and the rear roll electrode so that current can flow through the member between the front roll electrode and the rear roll electrode.

According to an aspect of the present invention, the first drawer includes a first die that passes through the workpiece and cold-draws the workpiece at a temperature lower than the recrystallization temperature of the workpiece, the workpiece is a wire rod having a circular cross section, The first die may be a die that passes the workpiece through a die hole having a diameter smaller than the diameter of the workpiece.

According to an aspect of the present invention, the front roll electrode or the rear roll electrode includes a concave outer diameter surface formed so as to correspond to an outer diameter surface of the workpiece, and at least an upper surface, a lower surface, a left surface, Or a combination of at least two of them may be selected.

According to an aspect of the present invention, when the front roll electrode is brought into contact with the upper surface of the workpiece, the rear roll electrode contacts the lower surface of the workpiece, and when the front roll electrode contacts the lower surface of the workpiece , And the rear roll electrode may be in contact with the upper surface of the workpiece.

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

According to an aspect of the present invention, the front roll electrode or the rear roll electrode includes: a totally pulley-shaped body portion having a concave 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.

Further, according to an aspect of the present invention, the first drawer includes: at least a pair of first dies for first pressing in a rolling contact with the workpiece; And at least a pair of Nth die (N is an integer equal to or greater than 2) arranged in a spaced-apart relationship from the first die and rolling in contact with the work in Nth order.

Further, according to an aspect of the present invention, there is provided a M-th drawer (M is an integer of 2 or more) having at least a pair of M-th die rolling contact with the moving workpiece to be moved and drawing the workpiece by M-th order; A front roll electrode in rolling contact with the workpiece prior to passing through the Mth drawer and in electrical contact with the workpiece; A rear roll electrode in rolling contact with the workpiece after passing through the Mth drawer and in electrical contact with the workpiece; And an M-electricity supplier for generating a potential difference between the front roll electrode and the rear roll electrode so that current can flow through the member between the front roll electrode and the rear roll electrode.

Further, the wire drawing apparatus of the electric conduction type according to the present invention is characterized in that the wire drawing apparatus of the present invention is provided on the front roll electrode or the rear roll electrode, and presses the front roll electrode or the rear roll electrode in the direction of the workpiece And an elastic member to which a restoring force is applied in the direction of the elastic force.

Further, the wire drawing apparatus of the electric current conduction type according to the present invention is characterized in that it comprises a skirt member which is provided on the front roll electrode or the rear roll electrode and contacts the surface of the front roll electrode or the rear roll electrode, ; ≪ / RTI >

The wire drawing apparatus of the electric conduction type according to the present invention may further include a conductive oil supply pipe provided on the front roll electrode or the rear roll electrode and supplying conductive oil to the front roll electrode or the rear roll electrode .

According to an aspect of the present invention, there is provided a pulling method of an electric current conduction system including: a front roll electrode that is in rolling contact with a workpiece before passing through a first drawer that is cold drawn at a temperature lower than a recrystallization temperature of the workpiece; A potential difference is generated between the front roll electrode and the rear roll electrode so that a current can flow through the workpiece between the front roll electrode and the rear roll electrode using a rear roll electrode in rolling contact with the workpiece after passing through the first drawing unit So that the workpiece can be formed.

1 is a perspective view conceptually showing a wire drawing apparatus of an electrification type according to some embodiments of the present invention.
Fig. 2 is a partial front sectional view showing the front roll electrode of Fig. 1; Fig.
Fig. 3 is a partial front sectional view showing another embodiment of the front roll electrode of Fig. 2; Fig.
Fig. 4 is a partial front sectional view showing still another embodiment of the front roll electrode of Fig. 2; Fig.
5 is a side cross-sectional view conceptually showing an electrified wire drawing apparatus according to some embodiments of the present invention.
6 is a cross-sectional side view conceptually showing an electrified wire drawing apparatus according to some embodiments of the present invention.
Fig. 7 is a cross-sectional view showing the front roll electrode or the rear roll electrode of Fig. 1;
8 is a cross-sectional view showing another embodiment of the front roll electrode or the rear roll electrode of Fig. 7;
Fig. 9 is a cross-sectional view showing still another embodiment of the front roll electrode or the rear roll electrode of Fig. 7;
10 is a perspective view showing bearing electrodes of the front roll electrode or the rear roll electrode of Fig. 1;
11 is a perspective view showing the brush electrode of the front roll electrode or the rear roll electrode of FIG.
Fig. 12 is a side sectional view conceptually showing another embodiment of the first drawer of Fig. 1; Fig.
Fig. 13 is a side cross-sectional view conceptually showing a state in which a plurality of wire drawing apparatuses of the electric conduction type according to some embodiments of the present invention shown in Fig. 1 are installed on a workpiece side by side. Fig.
Fig. 14 is a perspective view showing another embodiment of the front roll electrode or the rear roll electrode of Fig. 1; Fig.
FIG. 15 is a perspective view showing another embodiment of the front roll electrode or the rear roll electrode of FIG. 1; FIG.
FIG. 16 is a perspective view showing another embodiment of the front roll electrode or the rear roll electrode of FIG. 1; FIG.

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, It 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.

FIG. 1 is a perspective view conceptually showing an electric conduction type wire drawing apparatus 100 according to some embodiments of the present invention.

1, an electrified wire drawing apparatus 100 according to some embodiments of the present invention includes a first drawer 11, a front roll electrode FR, A roll electrode RR and a first electric power supply C1.

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

The first drawer 11 includes a first die that passes a moving workpiece 1 and cold-draws the workpiece 1 below the recrystallization temperature of the workpiece 1 (1) is a wire rod having a circular cross section, and the first die includes a die (1) for passing the work (1) through a die hole having a diameter smaller than the diameter of the work (1) .

Here, the first drawer 11 has been described as a draw-forming machine for reducing the diameter of the work 1. However, the first drawer 11 may be a draw- All kinds of molding machines can be applied.

In addition to the wire material having a circular section in cross section, the workpiece 1 may have a wide variety of shapes such as an oval shape, a polygonal shape, a composite shape, and the like.

The front roll electrode FR may be a terminal that is in rolling contact with the workpiece 1 before passing through the first drawer 11 and in electrical contact with the workpiece 1. [

The rear roll electrode RR may be a terminal that is in rolling contact with the work 1 after passing through the first drawer 11 and in electrical contact with the work 1.

Here, the front roll electrode FR and the rear roll electrode RR may rotate and support the work 1 while idling without applying current.

The first electric power supply unit C1 is connected to the front roll electrode FR and the front roll electrode FR so that a current can flow through the work 1 between the front roll electrode FR and the rear roll electrode RR, And a potential difference is generated between the rear roll electrodes RR.

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 unit C1 may supply electric current to the work 1 between the front roll electrode FR and the rear roll electrode RR in accordance with the type of the work 1. [ Current can be supplied to the front roll electrode FR and the rear roll electrode RR so that the density 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 work 1, the first electric supply part C1 is driven by the front roll electrode FR and the rear roll electrode RR, The work 1 can be formed by using a low forming force by continuously flowing a current of a current density capable of conducting current to the work 1 between the roll electrodes RR. In addition, since the work 1 passes between the front roll electrode FR and the rear roll electrode RR, an annealing effect in which the stress in the metal is reduced due to a high current density can be exhibited.

At this time, the front roll electrode FR and the rear roll electrode RR come into rolling contact with the work 1 to minimize friction, and face contact is made not by point contact, The 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 front roll electrode FR in Fig. 1, Fig. 3 is a partial front sectional view showing another embodiment of the front roll electrode FR in Fig. 2, Sectional view showing still another embodiment of the electrode FR.

As shown in Fig. 2, the front roll electrode FR or the rear roll electrode RR can be all in contact with the upper and lower surfaces of the work 1, and as shown in Fig. 3, And may be in contact with the left and right sides as shown in Fig.

5 is a side cross-sectional view conceptually showing an electrified wire drawing apparatus 200 according to some embodiments of the present invention.

As shown in FIG. 5, when the front roll electrode FR is brought into contact with the upper surface of the work 1, the rear roll electrode RR can be brought into contact with the lower surface of the work 1. Therefore, when the diameter of the work 1 is large, the direction of the current can flow in the diagonal direction from the front upper portion to the rear lower portion so that the current can evenly flow.

Conversely, although not shown, it is also possible that the rear roll electrode RR is brought into contact with the upper surface of the work 1 when the front roll electrode FR is brought into contact with the lower surface of the work 1.

6 is a side cross-sectional view conceptually showing an electrified wire drawing apparatus 300 according to some embodiments of the present invention.

As shown in FIG. 6, a first-first electricity supply unit (C1-1) for supplying electricity to the front roll electrode (FR1) and the rear roll electrode (RR1) so that the direction of the current can be crossed in an X- It is also possible to allow a current to flow evenly over a larger area by using the first and second electric supply units C1-2 for supplying electricity to the front roll electrode FR2 and the rear roll electrode RR2.

That is, Fig. 6 shows that the direction of the current may cross in the X-shape from the front upper portion to the rear lower portion and from the front lower portion to the rear upper portion.

Fig. 7 is a cross-sectional view showing the front roll electrode FR or the rear roll electrode RR in Fig. 1. Fig.

7, the front roll electrode FR or the rear roll electrode RR has a concave outer diameter surface 20a corresponding to the outer diameter surface of the work 1, The body 20 includes a body 20 and a right side 20c which are formed on the left side 20b and the right side 20c of the body 20. The body 20 has a rotation axis 21a, (21). Accordingly, the body 10 can be rotated in the rolling contact with the work 1 on the basis of the rotary shaft 21.

8 is a cross-sectional view showing another embodiment of the front roll electrode FR or the rear roll electrode RR in Fig.

8, the body portion 20 may have a trough 22 formed on the external surface 20a to separate foreign objects between 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.

9 is a cross-sectional view showing still another embodiment of the front roll electrode FR or the rear roll electrode RR in Fig.

9, the body portion 20 and the rotary shaft portion 21 may have a first material portion 20-1 and a second material portion 20b formed therein, 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.

10 is a perspective view showing the bearing electrode 30 of the front roll electrode FR or the rear roll electrode RR in Fig.

10, 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.

11 is a perspective view showing the brush electrode 40 of the front roll electrode FR or the rear roll electrode RR in Fig.

As shown in FIG. 11, the rotary shaft 21 may be electrically connected to the brush electrode 40 electrically connected to the first electric power supply unit C1 so as to enable stable energization.

12 is a side sectional view conceptually showing another embodiment of the first drawer 11 of Fig.

12, the first drawer 11 includes at least a pair of first dies 11-1 that pass through the work 1 to draw first, At least a pair of second die 11-2 spaced apart from the first die 11-1 and arranged to be spaced apart from each other and to be secondarily drawn out through the work 1 and a second die 11-2 spaced apart from the second die 11-2, And at least a third pair of third die 11-3 which are arranged and drawn out by passing through the work 1. In addition, although not shown, at least a pair of N-th die (N is an integer of 2 or more) arranged to be spaced apart from and spaced apart from the first die 11-1 and passing through the work 1 to draw N-th .

Therefore, it is possible to use the first electric power supply unit C1 to supply the electric power to the work 1 passing through the first die 11-1, the second die 11-2 and the third die 11-3 Electricity can be supplied.

Fig. 13 is a side cross-sectional view conceptually showing a state in which a plurality of wire-drawing apparatus 100 of the electric current conduction type according to some embodiments of the present invention shown in Fig. 1 are installed on a workpiece side by side.

As shown in Fig. 13, a second ejector (first ejector) 12 having at least a pair of second dies 12-1 for passing the moving work piece 1 through the second draw- A front roll electrode FR in rolling contact with the workpiece 1 before passing through the second drawer 12 and in electrical contact with the workpiece 1, And a rear roll electrode RR in rolling contact with the work 1 after passing through the machine 12 and in electrical contact with the workpiece 1 and between the front roll electrode FR and the rear roll electrode FR, (C2) for generating a potential difference between the front roll electrode (FR) and the rear roll electrode (RR) so that a current can flow through the work (1) between the front roll electrode .

A third drawer (13) having at least a pair of third dies (13-1) through which the work (1) to be moved passes and which performs the third drawing and forming of the work (1) A front roll electrode FR in rolling contact with the work 1 before passing through the third drawer 13 and in electrical contact with the work 1 and a second roll electrode FR passing through the third drawer 13 A rear roll electrode RR in rolling contact with the subsequent workpiece 1 and in electrical contact with the workpiece 1 and a second roll electrode RR in electrical contact with the workpiece 1 between the front roll electrode FR and the rear roll electrode RR. And a third electric power supply unit C3 for generating a potential difference between the front roll electrode FR and the rear roll electrode RR so that current can flow through the work 1. [

Therefore, the first die 11-1, the second die 12-1 and the third die D2 are electrically connected to each other by using the first electric supply part C1, the second electric supply part C2 and the third electric supply part C3. It is possible to supply electricity independently to each of the workpieces 1 passing through the workpiece 13-1.

A second ejector 12 (not shown) having at least a pair of second dies 11-2 for passing the above-mentioned work 1 to be moved therethrough and secondly drawing and forming the work 1 M is an integer of 2 or more), a front roll electrode (FR) in rolling contact with the work (1) before passing through the Mth drawer and in electrical contact with the work (1) A rear roll electrode (RR) in rolling contact with the work (1) after passing through the first roll electrode (FR) and in electrical contact with the work (1) And an M-th electric power supply unit for generating a potential difference between the front roll electrode FR and the rear roll electrode RR so that a current can flow through the work 1.

Fig. 14 is a perspective view showing another embodiment of the front roll electrode FR or the rear roll electrode RR in Fig. 1. Fig.

14, an electrified wire drawing apparatus according to some embodiments of the present invention is provided on the front roll electrode FR or the rear roll electrode RR, and the front roll electrode FR) or a resilient member (50) to which a restoring force acts in the direction of the work (1) so as to press the rear roll electrode (RR) toward the work (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 front roll electrode FR or the rear roll electrode RR in Fig. 1. Fig.

15, an electrified wire drawing apparatus according to some embodiments of the present invention is provided on the front roll electrode FR or the rear roll electrode RR, and the front roll electrode (FR) or a skirt member (60) for contacting the surface of the rear roll electrode (RR) and separating the foreign matter (2). 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.

Fig. 16 is a perspective view showing another embodiment of the front roll electrode FR or the rear roll electrode RR in Fig. 1. Fig.

16, an electrified wire drawing apparatus according to some embodiments of the present invention is provided on the front roll electrode FR or the rear roll electrode RR, FR) or a conductive oil supply pipe (70) for supplying the conductive oil (3) to the rear roll electrode (RR). Therefore, the electrical contact efficiency can be improved by using the conductive oil 3.

On the other hand, the drawing method of the electric conduction method using the wire drawing apparatus of the electric conduction type according to the present invention is a method of drawing the workpiece 1 in contact with the workpiece 1 at a temperature lower than the recrystallization temperature of the workpiece 1, A front roll electrode that is in rolling contact with the workpiece before passing through the first drawer and a rear roll electrode that is in rolling contact with the workpiece after passing through the first drawer, And a potential difference is generated between the front roll electrode and the rear roll electrode so that a current can flow through the member between the roll electrode and the rear roll electrode to form the processing member.

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
2: Foreign matter
3: Conductive oil
11: First drawing machine
11-1: First die
11-2:
11-3: Third die
12: second drawing machine
12-1: second die
13: Third Drawer
13-1: Third die
FR, FR1, FR2: front roll electrode
RR, RR2, RR2: rear roll electrode
C1: first electric supply portion
C1-1: 1-1 electrical supply unit
C1-2: First and second electric supply units
C2: second electric supply part
C3: third electric supply part
100, 200, 300: Electric wire drawing wire drawing 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

Claims (16)

A first drawer for passing a workpiece in the form of a moving wire, and drawing and forming the workpiece;
A front roll electrode in rolling contact with the workpiece prior to passing through the first drawer and in electrical contact with the workpiece;
A rear roll electrode in rolling contact with the workpiece after passing through the first drawer and in electrical contact with the workpiece; And
A first electric power supply unit generating a potential difference between the front roll electrode and the rear roll electrode so that a current can flow through the member between the front roll electrode and the rear roll electrode;
And a wire drawing device for drawing the wire. The method according to claim 1,
Wherein the first drawer includes a first die through which the workpiece is passed and which is cold drawn to a temperature below the recrystallization temperature of the workpiece,
Wherein the workpiece is a wire rod having a circular section and the first die is a die for passing the workpiece through a die hole having a diameter smaller than the diameter of the workpiece. The method according to claim 1,
Wherein the front roll electrode or the rear roll electrode has a recessed outer diameter surface corresponding to an outer diameter surface of the workpiece and at least one of a top surface, a bottom surface, a left surface, a right surface, And the wire is brought into contact with the wire. The method according to claim 1,
When the front roll electrode is brought into contact with the upper surface of the workpiece, the rear roll electrode is brought into contact with the lower surface of the workpiece, and when the front roll electrode is brought into contact with the lower surface of the workpiece, Is brought into contact with the upper surface of the wire drawing apparatus. The method according to claim 1,
When the front roll electrode is in contact with the left side surface of the workpiece, the rear roll electrode is in contact with the right side surface of the workpiece, and when the front roll electrode is in contact with the right side surface of the workpiece, And is in contact with the left side of the workpiece. The method according to claim 1,
Wherein the front roll electrode or the rear roll electrode comprises:
A generally pulley-shaped body portion having a concave 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;
And a wire drawing device for drawing the wire. The method according to claim 6,
Wherein the body portion has a groove formed on the outer 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;
And a wire drawing device for drawing the wire. 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 the brush electrode electrically connected to the first electric power supply portion. The method according to claim 1,
The first drawer
At least one pair of first die in rolling contact with the workpiece for primary pressing; And
At least a pair of Nth die (N is an integer equal to or larger than 2) arranged in a spaced-apart relationship from the first die and rolling in contact with the workpiece N-th orderly;
And a wire pulling device for pulling the wire. The method according to claim 1,
An M th drawer (M is an integer of 2 or more) having at least a pair of M th die for rolling-contact with the moving workpiece and for drawing the workpiece by M-th order;
A front roll electrode in rolling contact with the workpiece prior to passing through the Mth drawer and in electrical contact with the workpiece;
A rear roll electrode in rolling contact with the workpiece after passing through the Mth drawer and in electrical contact with the workpiece; And
An M-th electric power supply unit generating a potential difference between the front roll electrode and the rear roll electrode so that a current can flow through the member between the front roll electrode and the rear roll electrode;
And a wire drawing device for drawing the wire. The method according to claim 1,
An elastic member provided on the front roll electrode or the rear roll electrode and having a restoring force in the direction of the workpiece so as to press the front roll electrode or the rear roll electrode in the direction of the member to be processed;
Further comprising: a wire pulling device of an electric current conduction type. The method according to claim 1,
A skirt member installed on the front roll electrode or the rear roll electrode and contacting a surface of the front roll electrode or the rear roll electrode to separate foreign matter;
Further comprising: a wire pulling device of an electric current conduction type. The method according to claim 1,
A conductive oil supply pipe installed in the front roll electrode or the rear roll electrode and supplying conductive oil to the front roll electrode or the rear roll electrode;
Further comprising: a wire pulling device of an electric current conduction type. A front roll electrode in rolling contact with a workpiece in the form of a wire before passing through a first drawing unit which is cold drawn below the recrystallization temperature of the workpiece and a rear roll electrode in rolling contact with the workpiece after passing through the first drawer And a potential difference is generated between the front roll electrode and the rear roll electrode so that a current can flow through the member to be processed between the front roll electrode and the rear roll electrode, thereby forming the work.

Images