KR102560256B1 - a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same - Google Patents

Abstract

An embodiment is a rolling device for electrical welding and an electrical contact manufacturing device including the same.
A rolling device for electric welding according to an embodiment includes a cylindrical rolling body, a rounding recess rolling portion disposed on an outer circumference of the rolling body, a fastening through-hole passing through a central axis of the rolling body, and the fastening through-hole It may include; a fastening groove extending into the rolling body.

Description

A rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same}

The embodiment relates to a rolling device for electrical contact and an electrical contact manufacturing device including the same.

Electrical contact materials are electrical contact elements that mechanically open or close electrical circuits, and are widely used in general industries such as various switches, relays, and electronic switches, electrical, electronic, communications, automobiles, and elevators.

The required performance of an electrical contact point is that contact resistance should be low, electrical conductivity, thermal conductivity, and stability should be high, wear resistance should be excellent, and deformation of the contact surface should be low.

Although the performance of such an electrical contact is expressed by the constituent materials of the electrical contact, minimizing surface defects or contaminants that may occur during the manufacturing process of the electrical contact is very important in determining the performance of the electrical contact.

On the other hand, electrical contact materials are used in electrical products of various materials depending on the use environment, and are manufactured by melting and powder metallurgy methods according to manufacturing methods.

For example, electrical contacts manufactured by the melting method include Ag-Cu, Ag-CdO, or Ag-SnO ₂ , and electrical contacts manufactured by the powder metallurgy method include Cu-W, Ag-W, Ag -There are WC-based, Ag-C-based, Ag-Ni-based, etc.

According to the internal technology of the applicant, AgCu electrical contact material is a contact material suitable for continuous casting rather than extrusion, and is manufactured through continuous casting in a gravity method.

For example, according to internal technology, processes such as melting, continuous casting, wire drawing, and cutting are in progress as manufacturing processes for Ag-Cu-based contact materials or noble metal materials.

However, electrical contacts or precious metal materials have poor surface quality, such as teeth marks caused by knurling on solid billets by continuous casting of Ag-Cu-based contact materials or crusts on the surface of products cut after drawing. As such, there is a problem of deterioration in performance or quality.

Specifically, FIG. 1 is a photograph of an Ag-Cu-based contact material casting state in a continuous casting process according to an internal technology.

According to the internal technology, in the continuous casting process of molten metal, the solidified billet (BS) is pulled out by a fine pressure or tension using a predetermined transfer roll (not shown).

However, according to the internal technology, in order to increase the drawing tension or frictional force, a predetermined inclined serrated knurling (not shown) is performed on the contact surface of the transfer roll, and by such knurling, the surface of the solid billet (BS) Surface pitting phenomena such as tooth wheel marks (BD) corresponding to the knurling pattern occur.

Meanwhile, for process efficiency, downward tension for moving the solid billet (BS) downward through the conveying roll must be applied, and in order to increase downward tension, it is necessary to increase frictional force through knurling.

However, due to such knurling, surface dents such as saw teeth marks (BD) occur on the surface of the solid billet (BS), and these teeth wheel marks (BD) are technical contradictions that degrade performance or surface quality as an electrical contact or precious metal material. are facing

2 is a photograph of a wire W1 drawn of Ag-Cu-based contact material according to an internal technology.

According to the internal technology, as shown in FIG. 2, a surface shell (W1D) occurs in the wire W1 of the Ag-Cu-based contact material and the performance or quality of the electrical contact or precious metal material is deteriorated due to the deterioration of the surface quality. there is

The surface skin (W1D) of the drawn wire is caused by the tooth wheel mark (BD) of the solid billet (BS) due to the aforementioned knurling or the surface oxidation of the drawn wire.

One of the technical challenges of the embodiment is to prevent surface pitting from occurring on the surface of the solid billet while applying appropriate tension to the solid billet (BS) in Ag-Cu-based contact materials or noble metal materials Rolling for electrical welding It is intended to provide a device and an electrical contact manufacturing device including the same.

In addition, one of the technical challenges of the embodiment is to solve the problem of deterioration in performance or quality as an electrical contact or precious metal material due to poor surface quality such as skin on the surface of a product cut after Ag-Cu contact material or precious metal material drawing. .

Technical problems of the embodiments are not limited to those described in this section, and include those that can be grasped throughout the specification.

According to an embodiment, a rolling device for electric welding includes a cylindrical rolling body, a rounding recess rolling part disposed on an outer circumference of the rolling body, a fastening through-hole passing through a central axis of the rolling body, and the fastening through-hole It may include; a fastening groove extending toward the inside of the rolling body.

The rounding recess rolling part may be disposed on an outer circumference of the rolling body along an axis perpendicular to a central axis of the rolling body.

The rounding recess rolling part may include a first rounding recess surface part disposed in a first region of the outer circumference of the rolling body and a first rounding recess pattern part disposed in a second region of the outer circumference of the rolling body. .

The first rounding recess pattern part may be disposed on an axis perpendicular to a central axis of the rolling body.

The embodiment may further include a second rolling body having a predetermined second rounding recess rolling part at a position corresponding to the rounding recess rolling part.

The second rounding recess rolling part of the second rolling body may include a second rounding recess surface part in the first area and a second rounding recess pattern part in the second area of the outer circumferential surface of the second rolling body.

The second rounding recess rolling part of the second rolling body may include a third rounding recess pattern part in a third region of an outer circumferential surface of the second rolling body.

The second rounding recess pattern part may not be disposed on an axis perpendicular to the central axis of the rolling body.

The third rounding recess pattern part may not be disposed on an axis perpendicular to the central axis of the rolling body.

The first rounding recess pattern part may not overlap the second rounding recess pattern part or the third rounding recess pattern part vertically.
A rolling device for electric welding according to an embodiment includes a cylindrical first rolling body;
a first rounding recess rolling part disposed on an outer circumference of the first rolling body;
a second rolling body having a predetermined second rounding recess rolling part spaced apart from the first rounding recess rolling part and vertically corresponding to the first rounding recess rolling part;
a fastening through-hole penetrating the central axis of the first rolling body; and
It may include; a fastening groove extending from the fastening through-hole to the inside of the first rolling body.
The first rounding recess rolling portion may include a first rounding recess surface portion disposed without a pattern in a first region recessed along the outer circumference of the first rolling body and a second rounding recess along the outer circumference of the first rolling body. It may include a first rounding recess pattern portion disposed with a pattern in the region.
The second rounding recess rolling part, the second rounding recess surface part disposed without a pattern in the first region recessed along the circumference of the outer circumferential surface of the second rolling body, the pattern on both sides of the second rounding recess surface part It may include a second rounding recess pattern part and a third rounding recess pattern part respectively disposed along the recessed circumference of the outer circumferential surface of the second rolling body.
The first rounding recess pattern part disposed in the recessed first region along the outer circumference of the first rolling body, and the second rounding rims disposed along the recessed circumference of the outer circumferential surface of the second rolling body. Upper and lower portions of the thin round recess pattern portion and the third rounding recess pattern portion may not overlap each other.
The first rounding recess rolling part includes a first rounding recess surface part, first-second, spaced apart from each other and disposed without a pattern in the first and third regions recessed along the outer circumference of the first rolling body; A pattern is provided in a round recess surface portion and a second region recessed along an outer circumference of the first rolling body, and disposed between the first round recess surface portion and the first-second round recess surface portions. A first rounding recess pattern portion may be included.
The second rounding recess rolling part, the second rounding recess surface part disposed without a pattern in the first region recessed along the circumference of the outer circumferential surface of the second rolling body, the pattern on both sides of the second rounding recess surface part To include a second rounding recess pattern part and a third rounding recess pattern part respectively disposed while spaced apart from each other along the recessed circumference of the outer circumferential surface of the second rolling body through the second rounding recess surface part can

An electrical contact manufacturing apparatus according to an embodiment includes a rolling device for electrical welding of any one of claims 1 to 9 for drawing a billet cast from a predetermined molten metal and an electrical contact for cutting the surface of a wire from which the billet is drawn. It may include shaving dies for use.

The shaving dies for electrical contact may include a die bearing part; and a die cutting unit having a cutting hole in the center.

The die bearing part includes a bearing body, a bearing inclined protrusion protruding from a first side surface of the bearing body toward the die cutting portion, and a bearing recess disposed on a second side surface opposite to the first side surface of the bearing body. can include

According to the electric contact rolling device according to the embodiment and the electrical contact manufacturing device including the same, the electric contact rolling device having a round recess structure has a high downward direction for a solid billet of Ag-Cu-based contact material or precious metal material. There is a technical effect of providing electrical contacts or precious metal materials with excellent surface quality by applying tension to improve process efficiency and at the same time preventing surface dents such as sawtooth marks from occurring on the surface of the solid billet.

In addition, according to the embodiment, in Ag-Cu-based contact material or noble metal material, the electrical conductivity or gloss is improved by removing the surface skin of the electrical contact material or noble metal material by shaving dies, so that the characteristics as an electrical contact or noble metal material are remarkably improved. There is a technical effect that improves.

The technical effects of the embodiments are not limited to those described in this section, and include those that can be grasped throughout the specification.

1 is a photograph of a casting state of Ag-Cu-based contact material according to internal technology.
Figure 2 is a photograph of a wire W1 drawn of Ag-Cu-based contact material according to internal technology.
Figure 3a is a front view of the electric welding rolling device 200 according to the embodiment.
Figure 3b is a right side view of the electric welding rolling device 200 according to the embodiment shown in Figure 3a.
Figure 4 is a frontal photograph of the electric welding rolling device 200 according to the embodiment.
5 is a cross-sectional view taken along line B1-B1' of the rolling device 200 for electric welding according to the embodiment shown in FIG. 4;
6 and 7 are examples of a rolling process using a first electric welding rolling device (200A) and a second electric welding rolling device (200B).
8 is an exemplary view of a rolling process using a first electric welding rolling device 200A and a second electric welding rolling device 200B as an additional embodiment.
9 is a perspective view of a shaving die 300 for electrical contacts or precious metals according to an embodiment.

Hereinafter, the invention according to an embodiment for solving the above problems will be described in more detail with reference to the drawings.

The suffixes "module" and "unit" for the components used in the following description are simply given in consideration of ease of writing this specification, and do not themselves give a particularly important meaning or role. Accordingly, the “module” and “unit” may be used interchangeably.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "include", "have" or "include" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or other features, numbers, steps, operations, components, parts, or combinations thereof, or any combination thereof, is not precluded from being excluded in advance.

(Example)

As described above, according to the applicant's internal technology, processes such as melting, continuous casting, wire drawing, and cutting are performed as manufacturing processes for Ag-Cu-based contact materials or noble metal materials. At this time, Cu may be included in about 7 to 20% according to the Ag-Cu composition ratio. In addition, a small amount of P may be added for deoxidation.

In the embodiment, the melting may employ a high-frequency induction melting furnace or a vacuum melting furnace, but is not limited thereto.

In the embodiment, the continuous casting machine used in continuous casting may be a curved type, a vertical curved type, a horizontal type, etc., but is not limited thereto.

Hereinafter, the rolling device according to the embodiment will be described mainly when applied to products for electrical contact, but the rolling device according to the embodiment can also be applied to products for precious metals.

Figure 3a is a front view of the rolling device 200 for electrical welding according to the embodiment, Figure 3b is a right side view of the rolling device 200 for electrical welding according to the embodiment shown in Figure 3a.

Referring to FIGS. 3A and 3B , the rolling device 200 for electrical welding according to the embodiment may include a rolling body 210 , a fastening through-hole 212 and a fastening groove 213 .

Specifically, the electric welding rolling device 200 according to the embodiment includes a cylindrical rolling body 210, a rounding recess rolling part 210R disposed on the outer circumference of the rolling body 210, and the rolling body ( 210) and a fastening groove 213 extending from the fastening through hole 212 to the inside of the rolling body 210.

A drive shaft (not shown) of a predetermined drive motor may be inserted into the fastening through-hole 212, and a fastening part (not shown) of the drive shaft may be fastened to the fastening groove 213 to transmit rotational driving force. there is.

According to the internal technology, in the continuous casting process of molten metal, drawing may be performed by downward tension through a solidified billet (BN) (see FIG. 7) between a pair of electric welding rolling devices 200.

The solid billet (BS) may be located between the rounding recess rolling parts (210R) of a pair of electric welding rolling devices 200, and the outer circumferential surface of the solid billet (BS) is a pair of rounding recess rolling It may be in contact with portion 210R.

According to the electric welding rolling device according to the embodiment, a high downward tension is applied to a solid billet of Ag-Cu-based contact material or noble metal material by the electric welding rolling device having a rounding recess rolling unit 210R. At the same time as improving efficiency, there is a technical effect that can provide electrical contacts or precious metal materials with excellent surface quality by preventing surface dents such as sawtooth marks from occurring on the surface of the solid billet.

Hereinafter, technical features of the electric welding rolling device 200 according to the embodiment will be described in more detail with reference to FIGS. 4 to 8 .

4 is a frontal photograph of a rolling device 200 for electrical welding according to an embodiment, and FIG. 5 is a cross-sectional view taken along line B1-B1' of the rolling device 200 for electrical welding according to the embodiment shown in FIG. .

4 and 5, the electric welding rolling device 200 according to the embodiment includes a cylindrical rolling body 210 and a rounding recess rolling part 210R disposed on the outer circumference of the rolling body 210. ) and a fastening through-hole 212 penetrating the central axis X of the rolling body 210.

The rounding recess rolling part 210R may be disposed along an axis Y perpendicular to the central axis X of the rolling body 210 . For example, the rounding recess rolling part 210R may be disposed along an outer circumferential surface of the rolling body 210 of an axis Y perpendicular to the central axis X of the rolling body 210 .

Next, FIGS. 6 and 7 are exemplary views of a rolling process for a solid billet (BN) using the first electric welding rolling device 200A and the second electric welding rolling device 200B. The solid billet BN may be moved in a direction perpendicular to the XY plane (Z axis).

According to the embodiment, a solid phase solidified between a pair of electric welding rolling devices, for example, a first electric welding rolling device (200A) and a second electric welding rolling device (200B) in a continuous casting process of molten metal. Drawing may be performed by downward tension through the billet BN (see FIG. 7 ).

The solid billet BN may be positioned between the pair of rounding recess rolling parts of the pair of electric welding rolling devices, and the outer circumferential surface of the solid billet BS may come into contact with the pair of rounding recess rolling parts.

For example, according to the embodiment, the solid billet (BN) is the first rounding recess rolling portion 200R1 of the first electric welding rolling device 200A and the second rounding of the second electric welding rolling device 200B. It is located between the recess rolling parts 200R2, and the outer circumferential surface of the solid billet BN may come into contact with the pair of rounding recess rolling parts.

In the internal technology, when the rounding recess rolling part is not adopted, the solid billet and the transfer roll are in line contact and the contact area is small, so the friction force is low.

However, although the tension is increased by knurling, there is a technical problem in that surface pitting occurs on the surface of the solid billet as the average pressure increases as the tension is concentrated on the contact surface with the solid billet in the transfer roll.

According to the embodiment, the outer peripheral surface of the solid billet (BN) is the first rounding recess rolling part (200R1) of the first electric welding rolling device (200A) and the second rounding lee of the second electric welding rolling device (200B) As the surface area located between the thin rolling parts 200R2 and in contact with the rounding recess rolling parts is significantly widened, the tension can be increased, and as the average pressure applied to the contact point is distributed, the surface of the solid billet (BN) has surface defects. There are special technical effects that do not cause

Accordingly, according to the rolling device for electric welding according to the embodiment, the rolling device for electric welding having a rounding recess structure, for example, a rounding recess rolling part, is applied to a solid billet of Ag-Cu-based contact material or noble metal material. There is a technical effect of providing electrical contacts or precious metal materials with excellent surface quality by applying high downward tension to improve process efficiency and at the same time to prevent surface dents such as teeth marks from occurring on the surface of the solid billet.

Next, FIG. 8 is an exemplary view of a rolling process using a first electric welding rolling device 200A and a second electric welding rolling device 200B as an additional embodiment.

Referring to FIG. 8 , the first electric welding rolling device 200A may include a first rounding recess rolling part 200R1.

In this case, the first rounding recess rolling part 200R1 may include a first rounding recess surface part 200R1a and a first rounding recess pattern part 200R1b.

The first rounding recess surface portion 200R1a may have a smooth surface without a predetermined knurling pattern, and the first rounding recess pattern portion 200R1b may have a rough surface having a predetermined knurling pattern.

The first rounding recess pattern part 200R1b may be disposed on a Y-axis perpendicular to the X-axis.

Also, the second electric welding rolling device 200B may include a second rounding recess rolling part 200R2.

The second rounding recess rolling part 200R2 may include a second rounding recess surface part 200R2a and a second rounding recess pattern part 200R2b. Also, the second rounding recess rolling part 200R2 may include a third rounding recess pattern part 200R2c.

The second rounding recessed surface part 200R2a may have a smooth surface without a predetermined knurling pattern, and the second rounding recessed pattern part 200R2b and the third rounding recessed pattern part 200R2c may have a predetermined knurled pattern. It can be a rough surface with .

The second rounding recess pattern portion 200R2b may be disposed on a Y1 axis that is not perpendicular to the X axis. Also, the third rounding recess pattern part 200R2c may be disposed on the Y3 axis that is not perpendicular to the X axis.

According to an additional embodiment, the first rounding recess pattern part 200R1b may not vertically overlap the second rounding recess pattern part 200R2b.

Also, according to an additional embodiment, the first rounding recess pattern part 200R1b may not vertically overlap the third rounding recess pattern part 200R2c.

According to the embodiment, the first round recess pattern part 200R1b is disposed at a position where it does not vertically overlap with the second round recess pattern part 200R2b or the third round recess pattern part 200R2c, so that the third round recess pattern part 200R1b Intensive line pressure applied to the billet is reduced by avoiding overlapping of the rounding recess pattern parts in the Y-axis direction where the strongest pressure is applied in the first rounding recess rolling part 200R1 and the second rounding recess rolling part 200R2. It can be prevented.

In addition, according to a further embodiment, the contact area with the billet is maximized by the first round recess surface portion 200R1a and the second round recess surface portion 200R2a, and the first to third round recess pattern portions have a triangular shape. As (200R1b, 200R2b, 200R2c) are arranged, there is a special technical effect that can maximize downward drawing tension.

Next, FIG. 9 is a perspective view of a shaving die 300 for electrical contacts or precious metals according to an embodiment.

In the following embodiments, the shaving dies 300 according to the embodiment will be mainly described when applied to electrical contacts, but the shaving dies according to the embodiment can also be applied to shaving dies for precious metals.

One of the technical problems of the embodiment is to solve the problem of deterioration of properties as an electrical contact or noble metal material due to poor surface quality such as peeling on the surface of a product cut after drawing in Ag-Cu-based contact material or precious metal material. is to do

Referring to FIG. 9 , an electrical contact shaving die 300 according to an embodiment may include a die bearing portion 310 and a die cutting portion 320 .

For example, the electrical contact shaving dies 300 according to the embodiment may include a die bearing portion 310 and a die cutting portion 320 having a cutting hole 320C in the center.

The die bearing part 310 includes a bearing body 311 and a bearing inclined protrusion 312 protruding from a first side surface of the bearing body 311 toward the die cutting part 320, and the bearing body 311 ) may include a bearing recess (310R) disposed on a second side opposite to the first side of the .

The bearing body 311 and the bearing inclined protrusion 312 may be integrally formed, but are not limited thereto. The die bearing part 310 may be formed of a metal material such as iron.

In addition, the die cutting part 320 includes a cutting body 321 coupled to the bearing body 311, and a protrusion extending from the cutting body 321 in a direction away from the first lateral direction of the bearing body 311. It may include a cutting blade portion 322 and a cutting hole 320C disposed in the center of the cutting blade portion 322.

The cutting body 321 and the cutting blade portion 322 may be integrally formed, but is not limited thereto.

The die cutting portion 320 may be formed of cemented carbide or artificial diamond, but is not limited thereto. For example, the material of the die cutting part 320 may be a WC-Co-based, WC-TiC-TaC-Co-based, or WC-TiC-Co-based sintered alloy, but is not limited thereto. The die-cutting part 320 may be firmly coupled in a shrink fit form after heating the bearing body 311 .

In the embodiment, the die bearing part 310 includes a bearing inclined protrusion 312 protruding in the direction of the die cutting part 320 from the first side of the bearing body 311, so that the die cutting part 320 is the bearing body. (311) By protruding from the surface, it is possible to precisely observe the surface cutting process of the electrical contact material, thereby enabling a precise surface cutting process, thereby providing a technical effect of providing high-quality contact material or precious metal material.

On the other hand, according to the internal technology, the problem that the cutting foreign matter discharged while the cutting object is being cut can fill the cutting hole has been studied. Accordingly, according to the embodiment, the die bearing part 310 includes a bearing inclined protrusion 312 protruding in the direction of the die cutting part 320 from the first side surface of the bearing body 311, so that the surface of the electrical contact material The foreign matter cut in may be spaced apart from the cutting blade portion 322 and the cutting hole 320C disposed in the center of the cutting blade portion 322 . Through this, the cutting foreign matter does not fill the cutting hole 320C and is spaced apart from the cutting edge portion 322, so that the cutting can proceed precisely.

The die bearing part 310 includes a bearing body 311 and a bearing inclined protrusion 312 protruding from a first side surface of the bearing body 311 toward the die cutting part 320, and the bearing body 311. It may include a bearing recess (310R) disposed on the second side opposite to the first side of the .

In addition, the die cutting portion 320 includes a cutting body 321 and a cutting blade portion 322 protruding from the cutting body 321 in the direction of the first side surface of the bearing body 311 and the cutting blade portion. 322 may include a cutting hole 320C disposed in the center, the cutting blade portion 322, and a cutting through portion 320T penetrating the cutting body 321.

A diameter D of the cutting through portion 320T of the die cutting portion 320 may gradually increase in a direction from the first side surface to the second side surface of the bearing body 311 .

According to the embodiment, as the diameter D of the cutting through portion 320T of the die cutting portion 320 gradually increases in the direction from the first side to the second side of the bearing body 311, the cut contact material It is possible to increase the efficiency of the cutting process by smoothly discharging and moving, and there is a technical effect of maintaining high quality of the contact material by preventing contact between the already cut contact material and the die cutting part 320 .

In the embodiment, the die cutting part 320 extends from the cutting body 321 in a direction away from the first lateral direction of the bearing body 311 and protrudes from the cutting edge part 322 and the cutting edge part 322 A cutting hole 320C disposed in the center may be included.

For example, the die cutting part 320 may include a cutting blade part 322 extending from the cutting body 321 in a direction away from the bearing inclined protrusion 312 and protruding.

The die cutting part 320 of the embodiment includes a cutting blade part 322 extending from the cutting body 321 in a direction away from the bearing inclined protrusion 312 and protruding, so that the surface cutting process of the electrical contact material is more precise. There is a special technical effect that can provide a high-quality contact material or precious metal material by enabling a precise surface cutting process that can be observed.

In addition, the die cutting part 320 includes a cutting blade part 322 protruding from the cutting body 321 in a direction away from the bearing inclined protrusion 312, so that foreign matter cut from the surface of the electrical contact material is removed by the cutting knife. It may be spaced apart from the cutting hole 320C disposed in the center of the part 322 and the cutting blade part 322.

Through this, there is a technical effect that cutting can proceed precisely by allowing the cutting foreign matter to be spaced apart from the cutting hole 320C and not to fill the cutting hole 320C.

Accordingly, according to the embodiment, the surface shell of the electrical contact material or precious metal material is removed by the shaving dies 300 for electrical contact according to the embodiment, and electrical conductivity or gloss is improved, so that the characteristics as an electrical contact or precious metal material are remarkably improved. There is a technical effect that improves.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, and effects illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and modifications should be construed as being included in the scope of the embodiments.

Although the above has been described focusing on the embodiment, this is only an example and does not limit the embodiment, and those skilled in the art in the field to which the embodiment belongs may find various things not exemplified above to the extent that they do not deviate from the essential characteristics of the embodiment. It will be appreciated that variations and applications of branches are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the embodiments set forth in the appended claims.

Claims (10)

a cylindrical first rolling body;
a first rounding recess rolling part disposed on an outer circumference of the first rolling body;
a second rolling body having a predetermined second rounding recess rolling part spaced apart from the first rounding recess rolling part and vertically corresponding to the first rounding recess rolling part;
a fastening through-hole penetrating the central axis of the first rolling body; and
A fastening groove extending from the fastening through hole to the inside of the first rolling body,
The first rounding recess rolling part includes a first rounding recess surface part, first-second, spaced apart from each other and disposed without a pattern in the first region and the third region recessed along the outer circumference of the first rolling body. A pattern is provided in a round recess surface portion and a second region recessed along an outer circumference of the first rolling body, and is disposed between the first round recess surface portion and the first-second round recess surface portions. It includes a first rounding recess pattern portion that is,
The second rounding recess rolling part, the second rounding recess surface part disposed without a pattern in the first region recessed along the circumference of the outer circumferential surface of the second rolling body, the pattern on both sides of the second rounding recess surface part And a second rounding recess pattern part and a third rounding recess pattern part respectively disposed while being spaced apart from each other through the second rounding recess surface part along the recessed circumference of the outer circumferential surface of the second rolling body, ,
The first rounding recess pattern part disposed in the second area recessed along the outer circumference of the first rolling body, the second rounding rims disposed along the recessed circumference of the outer circumferential surface of the second rolling body. A rolling device for electric welding, which does not overlap between the thin pattern portion and the third rounding recess pattern portion vertically. delete delete According to claim 1,
The first rounding recess rolling part,
Disposed on the outer circumference of the first rolling body along an axis perpendicular to the central axis of the first rolling body, electrical welding rolling device. According to claim 1,
The first rounding recess pattern part,
Disposed on an axis perpendicular to the central axis of the first rolling body, electrical welding rolling device. According to claim 1,
The second rounding recess pattern portion is not disposed on an axis perpendicular to the central axis of the first rolling body, rolling device for electrical welding. According to claim 1,
The third rounding recess pattern portion is not disposed on an axis perpendicular to the central axis of the first rolling body, rolling device for electric welding. An electric welding rolling device according to any one of claims 1 and 4 to 7 for drawing a billet cast from a predetermined molten metal; and
Containing, electrical contact manufacturing apparatus; shaving dies for electrical contacts for cutting the surface of the wire from which the billet is drawn. According to claim 8,
The shaving dies for electrical contacts,
die bearing part; and
, Electrical contact manufacturing apparatus comprising a; die cutting portion having a cutting hole in the center. According to claim 9,
The die bearing part,
An electrical contact comprising a bearing body, a bearing inclined protrusion protruding from a first side surface of the bearing body toward the die cutting portion, and a bearing recess disposed on a second side surface opposite to the first side surface of the bearing body. manufacturing device.

Images