KR102431874B1 - a rolling device for electrical contact having excellent surface quality and an electrical contact manufacturing apparatus including the same - Google Patents

Abstract

An embodiment relates to a rolling device for electrical contact and an electrical contact manufacturing apparatus including the same. The rolling device for electrical contact according to an embodiment includes: a cylindrical rolling body; a rounding recess rolling part which is disposed on an outer circumference of the rolling body; a fastening through-hole which penetrates the central axis of the rolling body; and a fastening groove which is extended from the fastening through-hole toward the inside of 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 contacts and an electrical contact manufacturing device including the same.

Electrical contact material is an electrical contact element that mechanically opens or closes or contacts an electric circuit, and is widely used in various industries such as electricity, electronics, communication, automobiles, elevators, such as switches, relays, and electromagnetic switches.

The required performance of the electrical contact should be low contact resistance, high electrical conductivity, heat conduction, and stability, excellent wear resistance, and low deformation of the contact surface.

Although the performance of such an electrical contact is expressed by the constituent materials of the electrical contact, it is very important to determine the performance of the electrical contact to minimize surface defects or contaminants that may occur during the manufacturing process of the electrical contact.

On the other hand, electrical contact materials are used in electrical products with various materials depending on the usage environment, and are manufactured by a melting method and a powder metallurgy method according to a manufacturing method.

For example, electrical contacts manufactured by melting are Ag-Cu, Ag-CdO, or Ag-SnO ₂ . Electrical contacts manufactured by powder metallurgy are Cu-W, Ag-W, Ag. -WC, Ag-C, Ag-Ni, etc.

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

For example, according to the internal technology, processes such as dissolution, continuous casting, wire drawing, and cutting are in progress in the manufacturing process of Ag-Cu-based contact material or precious metal material.

However, due to poor surface quality, such as teeth marks due to knurling on the solid billet by continuous casting of Ag-Cu-based contact materials, or peeling on the surface of cut products after drawing, electrical contacts or precious metal materials As a result, there is a problem that the performance or quality is deteriorated.

Specifically, Figure 1 is a picture of the casting state of the Ag-Cu-based contact material in the continuous casting process according to the internal technology.

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

However, according to the internal technology, a predetermined inclined sawtooth-shaped knurling (not shown) is performed on the contact surface of the transfer roll in order to increase the pulling tension or friction force, and by such knurling, the surface of the solid billet (BS) A surface dent phenomenon such as a toothed wheel mark (BD) corresponding to the knurling pattern occurs.

On the other hand, it is necessary to apply a downward tension to move the solid billet (BS) downward through the transfer roll for process efficiency, and to increase the downward tension, it is necessary to increase the frictional force through knurling.

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

Also, FIG. 2 is a photograph of a wire (W1) drawn of an Ag-Cu-based contact material according to an internal technique.

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

The surface shell (W1D) of the drawn wire is caused by the toothed wheel marks (BD) of the solid billet (BS) due to the knurling described above or the surface oxidation of the fresh wire.

One of the technical problems of the embodiment is rolling for electric welding to prevent occurrence of surface dents on the surface of the solid billet while applying an appropriate tension to the solid billet (BS) in the Ag-Cu-based contact material or noble metal material It is an object to provide an apparatus and an electrical contact manufacturing apparatus including the same.

In addition, one of the technical problems 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 peel on the surface of the cut product after the Ag-Cu-based contact material or precious metal material is drawn. .

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

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

The rounding recess rolling part may be disposed on an outer periphery 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 area of the outer periphery of the rolling body and a first rounding recess pattern part disposed in a second area of the outer periphery 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 rounded recess rolling part of the second rolling body may include a second rounding recess surface part in a first area of an outer peripheral surface of the second rolling body and a second rounding recess pattern part in a second area.

The second rounded recess rolling part of the second rolling body may include a third rounding recess pattern part in a third area 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 a central axis of the rolling body.

The third rounding recess pattern part may not be disposed on an axis perpendicular to a 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.

The electric contact manufacturing apparatus according to the embodiment, the electric contact rolling device for electric welding of any one of claims 1 to 9 for drawing a billet cast from a predetermined molten metal, and an electric contact for cutting the surface of the wire from which the billet is drawn for shaving dice.

The shaving die for the 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 the first side surface of the bearing body toward the die cutting part, and a bearing recess disposed on a second side surface opposite to the first side surface of the bearing body. may include

According to the rolling device for electric welding according to the embodiment and the electric contact manufacturing apparatus including the same, by the rolling apparatus for electric welding having a rounding recess structure, the Ag-Cu-based contact material or the solid billet of the noble metal material is high downward. There is a technical effect that can provide electrical contacts or precious metal materials with excellent surface quality by applying tension to improve process efficiency and at the same time prevent surface pitting such as teeth marks on the surface of the solid billet.

In addition, according to the embodiment, in the Ag-Cu-based contact material or noble metal material, the surface shell of the electrical contact material or noble metal material is removed by shaving dice, and electrical conductivity or glossiness is improved, so that the characteristics as an electrical contact or noble metal material are significantly improved. There is an improved technical effect.

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

1 is a photograph of the casting state of the Ag-Cu-based contact material according to the internal technology.
Figure 2 is a photograph of a wire (W1) drawn of Ag-Cu-based contact material according to the 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 rolling device 200 for electric welding according to the embodiment shown in Figure 3a.
4 is a front photograph of the rolling device 200 for electric welding according to the embodiment.
5 is a cross-sectional view taken along the line B1-B1' of the rolling device 200 for electric welding according to the embodiment shown in FIG.
6 and 7 are an example of a rolling process using the first electric welding welding device (200A) and the second electrical welding welding rolling device (200B).
8 is an exemplary view of a rolling process using a first electric welding tangent rolling device 200A and a second electric welding tangent rolling device 200B as a further embodiment.
9 is a perspective view of a shaving dice 300 for electrical contacts or precious metals according to the 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 "part" for the components used in the following description are given simply in consideration of the ease of writing the present specification, and do not impart a particularly important meaning or role by themselves. Accordingly, the terms “module” and “unit” may be used interchangeably.

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

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises", "have" or "includes" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one It should be understood that it does not preclude the possibility of the presence or addition of or more other features or numbers, steps, operations, components, parts, or combinations thereof.

(Example)

As described above, according to the applicant's internal technology, processes such as dissolution, continuous casting, wire drawing, and cutting are in progress in the manufacturing process of Ag-Cu-based contact material or noble metal material. At this time, depending on the Ag-Cu composition ratio, about 7 to 20% of Cu may be included. In addition, a trace 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.

The continuous casting machine employed in the continuous casting in the embodiment 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 mainly described when it is applied to products for electrical contact, but the rolling device according to the embodiment is also applicable to products for precious metals.

3A is a front view of the rolling device 200 for electrical welding according to the embodiment, and FIG. 3B is a right side view of the rolling device 200 for electrical welding according to the embodiment shown in FIG. 3A.

3A and 3B , the rolling device 200 for electric 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 periphery of the rolling body 210, and the rolling body ( It may include a fastening through-hole 212 passing through the center of the 210 and a fastening groove 213 extending from the fastening through-hole 212 to the inside of the rolling body 210 .

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

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

The solid billet BS may be positioned between the rounding recess rolling parts 210R of the pair of rolling device 200 for electrical welding, and the outer peripheral surface of the solid billet BS is a pair of rounding recess rolling It may be in contact with the part 210R.

According to the rolling apparatus for electric welding according to the embodiment, by applying a high downward tension to the solid billet of Ag-Cu-based contact material or noble metal material by the electric welding rolling apparatus having a rounding recess rolling part 210R, the process While improving the efficiency, there is a technical effect that can provide electrical contacts or precious metal materials with excellent surface quality by preventing the occurrence of surface pitting phenomena such as teeth marks on the surface of the solid billet.

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

4 is a front photograph of the rolling device 200 for electric welding according to the embodiment, and FIG. 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 and 5 , the rolling device for electric welding 200 according to the embodiment includes a cylindrical rolling body 210 and a rounding recess rolling part 210R disposed on the outer periphery 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 with an axis Y perpendicular to the central axis X of the rolling body 210 .

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

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

The solid billet BN may be positioned between the rounding recess rolling parts of the pair of rolling devices for electrical welding, and the outer peripheral surface of the solid billet BS may be in 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 part 200R1 of the first electric welding rolling device 200A and the second rounding of the second electric welding welding device 200B. It is positioned between the recess rolling parts 200R2, and the outer peripheral surface of the solid billet BN may be in contact with a pair of rounding recess rolling parts.

In the case of not adopting the rounding recess rolling part in the internal technology, the solid billet and the conveying roll were in line contact and the contact area was narrow, so the friction force was small.

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

According to the embodiment, the outer circumferential 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 welding rolling device 200B. As it is located between the recess rolling parts 200R2 and the surface area in contact with the rounding recess rolling part increases significantly, the tension may increase, 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 electrical welding according to the embodiment, the solid billet of Ag-Cu-based contact material or noble metal material by the rolling device for electrical welding having a rounding recess structure, for example, a rounding recess rolling part. By applying high downward tension to improve the process efficiency and at the same time prevent the occurrence of surface dents such as tooth marks on the surface of the solid billet, there is a technical effect that can provide electrical contacts or precious metal materials with excellent surface quality.

Next, as an additional embodiment, Figure 8 is an example of a rolling process using the first electric welding rolling device (200A) and the second electric welding welding rolling device (200B).

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 recessed surface portion 200R1a may have a smooth surface without a predetermined knurling pattern, and the first rounding recessed pattern portion 200R1b may have a rough surface with 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 portion 200R2a may have a smooth surface without a predetermined knurling pattern, and the second rounding recessed pattern portion 200R2b and the third rounding recessed pattern portion 200R2c may have a predetermined knurling pattern. It may be a rough surface with

The second rounding recess pattern part 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 a Y3 axis that is not perpendicular to the X axis.

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

Also, according to an additional exemplary 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 rounding recess pattern part 200R1b is disposed at a position that does not vertically overlap with the second rounding recess pattern part 200R2b or the third rounding recess pattern part 200R2c, so that the first rounding recess pattern part 200R1b is disposed. Concentrated line pressure applied to the billet by avoiding overlap of the rounding recess pattern portion in the Y-axis direction to which the strongest pressure is applied in the first rounding recess rolling part 200R1 and the second rounding recess rolling part 200R2 can be prevented

In addition, according to an additional embodiment, the contact area to the billet is maximized by the first rounding recess surface portion 200R1a and the second rounding recess surface portion 200R2a, and the first to third rounding recess pattern portions in a triangular shape (200R1b 200R2b, 200R2c) has a special technical effect that can maximize the downward pull-out tension by being placed.

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

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

One of the technical problems of the embodiment is to solve the problem of deterioration of properties as electrical contacts or precious metal materials due to poor surface quality, such as peeling on the surface of the cut product after wire drawing in Ag-Cu-based contact materials or precious metal materials is to do

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

For example, the shaving die 300 for electrical contact according to the embodiment may include a die bearing unit 310 and a die cutting unit 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 the first side surface of the bearing body 311 in the direction of the die cutting part 320 , and the bearing body 311 . ) may include a bearing recess 310R disposed on the second side opposite to the first side.

The bearing body 311 and the bearing inclined protrusion 312 may be integrally formed, but is 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 extends from the cutting body 321 coupled to the bearing body 311 in a direction away from the first lateral direction of the bearing body 311 and protrudes from the cutting body 321 . 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 part 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 sinter alloy, but is not limited thereto. The die cutting part 320 may be firmly coupled to the bearing body 311 in the form of shrink fit after heating.

In the embodiment, the die bearing part 310 includes a bearing inclined protrusion 312 that protrudes in the direction of the die cutting part 320 from the first side surface 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 high-quality contact material or noble metal material.

On the other hand, according to the internal technology, the problem that the cutting foreign material discharged as the cutting object is 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 that protrudes in the direction of the die cutting part 320 from the first side surface of the bearing body 311, thereby forming the surface of the electrical contact material. The foreign material cut in the cutting blade portion 322 and the cutting blade portion 322 may be spaced apart from the cutting hole 320C disposed in the center. Through this, the cutting foreign material does not fill the cutting hole 320C, and also has a technical effect that the cutting can be performed precisely by making it spaced apart from the cutting blade part 322 .

The die bearing part 310 includes a bearing body 311 and a bearing inclined protrusion 312 protruding from the first side of the bearing body 311 in the direction of 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 .

In addition, the die cutting part 320 includes a cutting body 321 and a cutting blade part 322 and the cutting blade part extending from the cutting body 321 in the first lateral direction of the bearing body 311 and protruding from the cutting body 321 . 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 .

The diameter D of the cutting through part 320T of the die cutting part 320 may gradually increase from the first side surface to the second side surface direction 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 from the first side to the second side of the bearing body 311, the cut contact material is It is possible to increase the efficiency of the cutting process by smoothly discharging, and by preventing the contact between the already cut contact material and the die cutting part 320, there is a technical effect that can maintain the high quality of the contact material.

In the embodiment, the die cutting part 320 includes a cutting blade part 322 and the cutting blade part 322 that extend and protrude from the cutting body 321 in a direction away from the first lateral direction of the bearing body 311 . 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 that extends from the cutting body 321 in a direction away from the bearing inclined protrusion 312 and protrudes.

The die cutting portion 320 of the embodiment includes a cutting blade portion 322 that extends and protrudes in a direction away from the bearing inclined projection 312 from the cutting body 321, so that the surface cutting process of the electrical contact material is more precisely Observable and precise surface cutting process is possible, so there is a special technical effect that can provide a high-quality contact material or precious metal material.

In addition, since the die cutting portion 320 includes a cutting blade portion 322 that extends from the cutting body 321 in a direction away from the bearing inclined projection 312 and protrudes, the foreign material cut from the surface of the electrical contact material is removed by the cutting blade. The part 322 and the cutting blade part 322 may be spaced apart from the cutting hole 320C disposed in the center.

Through this, the cutting foreign material does not fill the cutting hole 320C, and furthermore, it is spaced apart from the cutting blade part 322, so that the cutting can be performed precisely.

Accordingly, according to the embodiment, the surface shell of the electrical contact material or the noble metal material is removed by the shaving dice 300 for the electrical contact according to the embodiment, and the electrical conductivity or glossiness is improved, so that the characteristics as an electrical contact or a noble metal material are significantly improved. There is an improved technical effect.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment, and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the embodiments.

In the above, the embodiment has been mainly described, but this is only an example and not limiting the embodiment, and those of ordinary skill in the art to which the embodiment belongs may have several examples not illustrated above in the range that does not depart from the essential characteristics of the embodiment. It can be seen that variations and applications of branches are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such 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 periphery of the first rolling body;
a fastening through hole passing through the central axis of the first rolling body;
a fastening groove extending inside the first rolling body from the fastening through hole; and
a second rolling body having a predetermined second rounding recess rolling part at a position corresponding to the first rounding recess rolling part;
The first rounding recess rolling portion may include a first rounding recess surface portion disposed without a pattern in a first region of an outer periphery of the first rolling body and a pattern disposed in a second region of an outer periphery of the first rolling body It includes a first rounding recess pattern part,
The second rounding recess rolling part may include a second rounding recessed surface part disposed without a pattern in a first region of an outer peripheral surface of the second rolling body, and a pattern disposed on both sides of the second rounding recessed surface part, respectively. It includes a second rounding recess pattern part and a third rounding recess pattern part,
The first rounding recess pattern portion, the second rounding recess pattern portion and the third rounding recess pattern portion do not overlap between upper and lower portions, a rolling device for electrical welding. According to claim 1,
The first rounding recess rolling part
A rolling device for electrical welding, which is disposed on the outer periphery of the first rolling body along an axis perpendicular to the central axis of the first rolling body. delete According to claim 1,
The first rounding recess pattern portion
A rolling device for electrical welding, which is disposed on an axis perpendicular to the central axis of the first rolling body. delete delete 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, the rolling device for electrical welding. 8. The method of claim 7,
The third rounding recess pattern portion is not disposed on an axis perpendicular to the central axis of the first rolling body, the rolling device for electrical welding. delete A rolling device for electric welding of any one of claims 1, 2, 4, 7, and 8 for drawing a billet cast from a predetermined molten metal; and
Including; shaving dice for electrical contact for cutting the surface of the wire from which the billet is drawn;
The shaving dice for the electrical contact,
die bearing part; and
Includes; a die cutting unit having a cutting hole in the center;
The die bearing part,
An electrical contact comprising a bearing body, a bearing inclined protrusion protruding from the first side surface of the bearing body in the direction of 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 equipment.

Images