WO2004067810A1

WO2004067810A1 - The manufacturing method of cut electro-forming member and cut electro-forming member made by it

Info

Publication number: WO2004067810A1
Application number: PCT/KR2004/000139
Authority: WO
Inventors: Jeong-Sik Kim
Original assignee: GRAPHION TECHNOLOGIES USA LLC
Current assignee: GRAPHION TECHNOLOGIES USA LLC
Priority date: 2003-01-27
Filing date: 2004-01-27
Publication date: 2004-08-12
Anticipated expiration: 2005-07-27
Also published as: WO2004067811A1

Abstract

A method of manufacturing a cut electroforming member and a cut electroforming member made by it are disclosed, in which an electroforming process is performed in an electroforming tub by connecting a negative electrode to a core material having a nonconductive section and a positive electrode to a melted metal. The electroforming member is cut at a predetermined length by the nonconductive section. A desired sectional shape for the electroforming member is formed at one end or both ends of the nonconductive section. In this case, the shape of the end of the nonconductive section is imprinted on the end of the cut electroforming member. The nonconductive section may be divided into an upper section and a lower section, and may be made by injecting a liquid material into its die and hardening it. The forming material is kept in a die at a melted state or a partially melted state and is covered on the core material when the core material passes through the die. The forming material is thinly coated with a conductive material after it is hardened. An electroforming layer is formed by connecting a negative electrode to the conductive coating portion and performing an electroforming process in an electroforming tub. The core material in the electroforming member is removed by a drawing process. The inside of the electroforming member is then washed.

Description

THE MANUFACTURING METHOD OF CUT ELECTRO-FORMING MEMBER AND CUT ELECTRO-FORMING MEMBER MADE BY IT

TECHNICAL FIELD The present invention relates to a method of manufacturing a cut electroforming member and a cut electroforming member made by it, in which an electroforming process is performed in an electroforming tub by connecting a negative electrode to a core material having a nonconductive section and a positive electrode to a melted metal. In the present invention, an electroforming member is cut at a predetermined length by the nonconductive section. A desired sectional shape for the electroforming member is formed at one end or both ends of the nonconductive section. In this case, the shape of the end of the nonconductive section is imprinted on the end of the cut electroforming member. The nonconductive section may be divided into an upper section and a lower section, and may be made by injecting a liquid material into its die and hardening it.

BACKGROUND ART

Conventionally, after an electroforming member is formed, it is cut at a predetermined length by a mechanical process. It was general that the cut electroforming member has a desired sectional shape such as a conical shape through a mechanical process. In the present invention, an electroforming member is formed using a core material, and a nonconductive section is formed in the core material to efficiently cut the electroforming member and obtain its sectional shape. The electroforming member has an outer diameter of several microns to several tens of microns, several hundreds of microns or several thousands of microns . The electroforming member does not necessarily depend on ultrafine diameters. The thick diameter of the electroforming member will be within the range of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

In the drawings: FIG. 1 illustrates an electroforming process according to the present invention;

FIG. 2 illustrates a ferrule;

FIG. 3 illustrates a covering process of a forming material and a coating process of a conductive material; FIG. 4 illustrates an electroforming member manufactured by forming an electroforming layer on a conductive metal coating layer;

FIG. 5 illustrates a process of removing a core material from an electroforming member; FIG. 6 illustrates the state that a forming material and a conductive material are chemically removed from the electroforming member;

FIG. 7 illustrates an electroforming member having various shapes formed of different kinds of metal layers; FIG. 8 is an example of a core material having a nonconductive section;

FIG. 9 illustrates an electroforming process performed in a core material having a nonconductive section;

FIG. 10 illustrates an electroforming member formed in a core material having a nonconductive section;

FIG. 11 is an example of a nonconductive section formed at both ends of the electroforming member;

FIG. 12 is an example of a nonconductive section having lower and upper sections; and

FIG. 13 illustrates a nonconductive section formed in a die.

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL PROBLEMS

There is a problem in that considerably inconvenient work is needed to cut the electroforming member having a fine diameter at a predetermined size by a conventional mechanical process. There is also problem in the conventional mechanical process in that more considerably inconvenient work is needed to allow the cut electroforming member to obtain a predetermined sectional shape at its both ends. However, in the present invention, a nonconductive section is formed in a core material and an electroforming member is cut at a predetermined size by the nonconductive section. Also, the electroforming member can obtain a desired sectional shape. In the present invention, mass production of the cut electroforming member can be achieved at precise and exact dimensions. The conventional electroforming member made by the mechanical process has drawbacks in that processing precision cannot be obtained and a processed sectional portion is not clear due to a processing chip. This reduces processing efficiency. TECHNICAL SOLUTIONS

Accordingly, the present invention is directed to a method of manufacturing a cut electroforming member and a cut electroforming member made by it that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a method of manufacturing a cut electroforming member and a cut electroforming member made by it, in which an electroforming process is performed in an electroforming tub by connecting a negative electrode to a core material having a nonconductive section and a positive electrode to a melted metal.

In the present invention, an electroforming member is cut at a predetermined length by the nonconductive section. A desired sectional shape for the electroforming member is formed at one end or both ends of the nonconductive section. In this case, the shape of the end of the nonconductive section is imprinted on the end of the cut electroforming member. The nonconductive section may be divided into an upper section and a lower section, and may be made by injecting a liquid material into its die and hardening it.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the scheme particularly pointed out in the written description and claims hereof as well as the appended drawings .

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, a method of manufacturing a cut electroforming member includes the steps of covering a core material passing through a die with a forming material existing at a melted state or a partially melted state in the die, thinly coating the forming material with a conductive material after it is hardened, forming an electroforming member by connecting a negative electrode to the conductive coating portion and performing an electroforming process in an electroforming tub, removing the core material in the electroforming member by a drawing process, and washing the inside of the electroforming member.

APPLICABLE ADVANTAGES In the present invention, an electroforming member grown on the core material can be cut at a predetermined length. The cut electroforming member can have the same sectional shape as that of a nonconductive section.

The electroforming member such as an ultrafine pipe or bar made according to the present invention can uniformly be cut at several intervals. The later process of the electroforming member can easily be performed, and the processing cost can remarkably be reduced. For example, the inner and outer diameters of the electroforming member can exactly be controlled. The conventional electroforming member manufactured by the mechanical process does not have excellent surface illumination. However, the electroforming member having uniform and excellent processing illumination of several microns or less can be obtained by the electroforming process in the present invention. Also, a multiple layer can be formed of a material required for the electroforming member of the present invention by layering different kinds of metals and electroforming them.

While the present invention has been described and illustrated herein with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made therein without departing from the spirit and scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of this invention that come within the scope of the appended claims and their equivalents.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention relates to a method of manufacturing a cut electroforming member and a cut electroforming member made by it, in which an electroforming process is performed in an electroforming tub by connecting a negative electrode to a core material having a nonconductive section and a positive electrode to a melted metal. In the present invention, an electroforming member is cut at a predetermined length by the nonconductive section. A desired sectional shape is formed at one end or both ends of the nonconductive section and an electroforming process is performed. Thus, the shape of the end of the nonconductive section is imprinted on the end of the cut electroforming member. The nonconductive section may be divided into an upper section and a lower section, and may be made by injecting a liquid material into its die and hardening it.

In the present invention, the core material can be covered with a forming material. The core material has three types in the present invention. First, the core material may be of a conductive material. Second, the core material may be formed in such a manner that it is covered with a forming material and the forming material is thinly coated with a conductive material. Finally, the core material may be of a nonconductive material so that the nonconductive core material is thinly coated with a conductive material. In the present invention, the core material is defined as any one of the above types.

The forming material is kept in a die at a melted state or a partially melted state and is covered on the core material when the core material passes through the die. The forming material is thinly coated with a conductive material after it is hardened. An electroforming layer is formed by connecting a negative electrode to the conductive coating portion and performing an electroforming process in an electroforming tub. The core material in the electroforming member is removed by a drawing process. The inside of the electroforming • member is then washed.

The forming material is softened at a temperature of 100°C or less, or is contracted with the lapse of time to remove the core material. The forming material includes resin and a low temperature heat melting material. The low temperature heat melting material is softened at a temperature of 100°C or less. The low temperature heat melting material includes at least one of resin, pitch and wax. The resin is thermoplastic or thermosetting resin. An example of the resin includes epoxy resin. A small content of silicon may be added to the forming material to improve hetero-characteristics . The coated conductive material is thinly formed on the forming material by vacuum deposition. The coated conductive material is thinly deposited on the forming material by a chemical method.

In the present invention, ferrule that is a connecting member of an optical cable can be manufactured. The ferrule is formed with one end having a conical shape to easily insert an optical cable therein. In this case, the ferrule has an inner diameter of 125 microns. In the present invention, the core material is of metal or plastic. Preferably, stainless having strong tension is used as the core material.

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings . FIG. 1 illustrates an electroforming process according to the present invention. A metal ion melting solution 300 decomposed in ion state is contained in an electroforming tub 400. An electroforming metal case 100 of nickel, for example, is positioned at one side of the electroforming tub. A positive electrode is connected with the electroforming metal case and a negative electrode is connected with a conductive material 200 to be electroformed. A melted metal ion moves to the surface of the conductive material and is grown as a new electroforming metal layer thereon. This process is called an electroforming process. In the present invention, nickel, copper (Cu), gold(Au), or nickel (Ni) alloy is used as the metal used for electroforming. Other metal that can be electroformed may be used as the metal for electroforming.

FIG. 2 illustrates a ferrule. A ferrule 500 includes an inner through hole 600 having an inner diameter of 125 microns. A conical shaped incline plane 700 is formed at one end of the ferrule and a plane is formed at the other end. The optical cable can easily be inserted into the ferrule through the conical shaped incline plane 700.

FIG. 3 illustrates a covering process of a forming material and a coating process of a conductive material. It is general that a core material 1 has the size of several microns or several tens of microns. The core material is produced by a drawing process. The core material processed by drawing has limitation in its cylindrical degree. A number of scratches are generated on the surface of the core material due to the drawing process. In the present invention, the core material 1 is used, so that any effect of the scratches and the incomplete cylindrical degree on the core material is minimized. That is, a die 3 is supplied with the forming material 2 at a melted state or a partially melted state, and the core material 1 is drawn through the die 3 and at the same time is covered with the forming material. The forming material serves to cover damage formed on the core material. The forming material passed through the die 3 has a supplemented cylindrical degree like the shape of the die 3. If the die has a circular shape, the core material is covered with the forming material having a circular shape. If the die has a rectangular shape, the core material is covered with the forming material having a rectangular shape.

In the present invention, it is preferable that the forming material is softened by heat if it is hardened or the forming material is automatically contracted after the lapse of time if it is hardened. An example of the forming material includes mixture of resin and a low temperature heat melting material. In the experiment example, the forming material has been formed by mixing epoxy resin of 60%, resin of 20% as a heat melting material, and silicon of 20% for improving hetero-characteristics . If the core material has a thickness of 50 microns, it can easily be drawn without applying heat. If the core material has a thickness of 150 microns, it can be drawn by applying heat at a temperature of 100°C or less. If the core material has a thin thickness, it is easily removed without applying heat after the lapse of time. This is because that the forming material is automatically contracted with the lapse of time after it is hardened. In the present invention, a low temperature heat melting material such as pitch or wax may be used instead of resin. The low temperature heat melting material may be made by selectively mixing resin, pitch, and wax. Silicon has been used to increase hetero-characteristics.

In the present invention, the core material 1 has a thickness of several microns or several tens of microns, and the core material of metal or non-metal may be used. The core material of metal is preferably used because strong tension is required for the core material. An example of the metal core material includes stainless steel . The core material made by a mechanical method has some problems such as defects and scratches caused on its surface and uneven thickness. If the electroforming process is performed in the original core material without covering damage on the surface of the core material with the forming material, the surface roughness of the core material is reflected on the inside of the electroforming member and the core material is engaged with the scratches of the electroforming member. In this case, it is very difficult to remove the core material. However, in the present invention, the core material is uniformly covered with the forming material while being passed through the die. As a result, the scratches on the surface of the core material are all covered with the forming material. The inside of the ultrafine pipe according to the present invention is precisely controlled in its dimensions because the die can be controlled in ultra precision. In the present invention, the forming material is used to minimize poor effect of the core material by covering the core material and to easily remove the core material after the electroforming member is formed by the electroforming process. Since the forming material is positioned at . the boundary between the core material and the electroforming member, the core material is separated from the electroforming member. In the present invention, when the core material is covered with the forming material, it is preferable that the core material is uniformly covered with the forming material with concentricity while passing through the center of the die.

After the core material is covered with the forming material and the forming material is hardened, the forming material is thinly coated with a conductive material. A conductive metal coating layer 4 may thinly be formed on the forming material by vacuum deposition or chemical method. The chemical method means that a metal film is formed by a chemical reaction that extracts chemical silver (Ag) or platinum. In the present invention, various metals such as gold, silver, copper or nickel may be used as the conductive metal. The conductive metal coating layer 4 is coated on the forming material 2 and serves as a conductor that serves to flow negative current during the electroforming process.

FIG. 4 illustrates a pipe manufactured by forming an electroforming layer on the conductive metal coating layer. An electroforming layer 5 serves as a main body of the ultrafine pipe of the present invention and is formed of electroforming metal such as nickel, nickel alloy or copper. Also, the electroforming layer 5 may be formed by layering different kinds of metals. To form the electroforming layer, melted metal ions move to the conductive metal coating layer by connecting negative electrode to the conductive coating layer and positive electrode to the electroforming metal. The moving metal ions start to be formed as an electroforming metal film on the surface of the conductive metal coating layer. The thickness of the electroforming metal film is grown with the lapse of time. As a result, the electroforming layer 5 is formed. The thickness of the electroforming layer is within the range of several microns to several tens of microns or several hundreds of microns. The thickness of the electroforming layer may be within the range of several millimeters.

FIG. 5 illustrates the process of removing the core material from the electroforming member. The core material 1 in the electroforming member is removed by a drawing process after the electroforming process is performed. In this case, the core material is not easily removed because it is thin. In the present invention, the forming material 2 coated on the surface of the core material is varied to a fluid state by heat to easily remove the core material. If the electroforming process is directly performed in the rough core material, it is difficult to remove the core material because the scratches of the core material are engaged with those inside the electroforming member. Also, there is limitation in improving precision because the scratches of the core material are reflected inside the electroforming member as they are. If the core material is physically drawn from the electroforming member, it may be likely to be cut during the drawing process. The inner wall of the electroforming member pipe is damaged when the core material is drawn. This makes the precise process difficult. In this case, the precise mechanical process is again performed to cover the damage of the inner wall of the electroforming member. In the present invention, fluidity is given to the forming material 2 by heating the electroforming member having the core material therein so that the core material is easily removed from the electroforming member. According to the experiment, if the core material having a small diameter and a short length is covered with the forming material, it is easily removed without applying heat. However, if the core material has a thick outer diameter, it is preferably removed by applying heat thereto. Since the forming material of the present invention is softened by heat even after it is hardened, it can remove the core material. Also, since the forming material is contracted with the lapse of time, it can remove the core material. In this case, heat deformation of the electroforming member can be avoided because the core material is not heated. It is preferable that the forming material is covered with a low temperature heat melting material that is varied to a fluid material at a low temperature below 100°C because high temperature affects the electroforming member.

If the core material is removed, the forming material 2 remaining in the electroforming member is generally removed by a chemical washing process. If the core material is thinly covered with the forming material at a thickness of 2 microns to 7 microns, defects or scratches formed on the surface of the core material are strongly coupled with the forming material. In this case, the forming material and the core material are simultaneously removed in a state that they are integrally coupled with each other. According to the results of the experiment as described above, if the forming material has a thickness of 2 microns to 7 microns, the forming material and the core material are simultaneously removed. The results of the experiment may depend on characteristics of the forming material. If the forming material 2 is thick, it is removed by a chemical washing process after the core material is removed. After the core material and the forming material are removed, the conductive material coating layer 4 remaining in the electroforming member is removed by a chemical melting method.

FIG. 6 illustrates the state that the forming material and the conductive material are chemically removed from the electroforming member. The forming material is preferably washed by selecting a solvent easily melted in a chemical material such as petroleum and toluene. The forming material and the conductive material coating layer can be removed by the solvent while vibration of ultrasonic waves during the washing process is generated. The electroforming member of the present invention can be formed of different kinds of metal layers 5a, 5b, and 5c. The metal layers include an intensity layer and a conductive layer depending on characteristics of the respective metal layers.

In the present invention, the electroforming member may have a thin inner diameter 9 and a thick outer diameter 5. In this case, ferrule used as a connecting member of an optical cable can be manufactured.

FIG. 7 illustrates an electroforming member formed of different kinds of metal layers. In the present invention, the electroforming member has various shapes different from a section of the core material using the forming material and the die. That is, the electroforming member can be manufactured in the same shape as that of the die. At this time, different kinds of metal layers of Cu, Ni, and Ag can be formed by varying metal in the electroforming tub.

FIG. 8 is an example of the core material having a nonconductive section. First, a core material 6 having a nonconductive section may be of a conductive material. Second, the core material 6 may be formed in such a manner that it is covered with a forming material and the forming material is thinly coated with a conductive material. Finally, the core material 6 may be of a nonconductive material so that the conductive core material is thinly coated with a conductive material. In the present invention, the core material corresponds to any one of the above types. Referring to FIG. 8, a nonconductive section 7 is formed and separated at several intervals. The nonconductive section 7 may include an end portion having various shapes. As an example, the nonconductive section 7 may include a conically inclined end portion 8 and a plane end portion 10. In the present invention, the nonconductive section is defined as an electrically insulated material formed in the core material and separated at several intervals. An insulating material having elasticity is preferably used as the nonconductive section. More preferably, the insulating material has hetero-characteristics. In this case, a separate hetero- layer is not required. As an example of an insulating material having elasticity and hetero-characteristics, silicon or rubber based material is used in the present invention. Such an insulating material can repeatedly be used. Once the electroforming process is performed, the electroforming member generates stress with the nonconductive section. When the electroforming member is detached from the nonconductive section as the electroforming process is finished, the stress fails to easily detach the electroforming member from the nonconductive section. That is, when the electroforming member is detached from the nonconductive section, the electroforming member affects the nonconductive section and vice versa due to the stress. This leads the electroforming member or the nonconductive section to be damaged. For this reason, it is preferable that the nonconductive section has elasticity.

FIG. 9 illustrates an electroforming process performed in the core material having the nonconductive section. A negative electrode is connected to the core material 6 and a positive electrode is connected to the electroforming tub so that the electroforming process is performed. Then, ionized metals move to the circumference of the core material 6 to form an electroforming metal layer 11. The electroforming metal layer 11 is separated at several intervals by the nonconductive section.

FIG. 10 illustrates the electroforming member formed in the core material having the nonconductive section. Once the electroforming metal layer is grown to have a certain thickness, a desired electroforming member 12 is completed.

FIG. 11 is an example of the nonconductive section formed at both ends of the electroforming member of FIG. 11. A specific shape may be formed at both ends 13 and 14 of the nonconductive section.

FIG. 12 is an example of the nonconductive section having lower and upper sections. The nonconductive section is divided into an upper section 15 and a lower section 16 around the core material. The upper and lower sections 15 and 16 can be coupled with or detached from each other. A through hole may be formed in the middle portion of the nonconductive section so that ^' the core material may be inserted into the through hole. FIG. 13 illustrates the nonconductive section formed in the die. A space portion 18 constituting the shape of the nonconductive section is formed in a die 20. A liquid type nonconductive material is injected into the space portion 18 through an injection hole 17. At this time, a core material 19 is positioned in the die 20. Once the liquid type nonconductive material in the die is hardened, the die is divided into both sides so that the core material having the nonconductive section is taken out. The electroforming member of the present invention may include a multiple layer of different kinds of metals, which is formed by varying metal in the electroforming tub.

Claims

What is claimed is:

1. A method of manufacturing a cut electroforming member comprising the steps of:

5 performing an electroforming process in an electroforming tub by connecting a negative electrode to a core material having a nonconductive section and a positive electrode to a melted metal; and cutting the electroforming member at a predetermined 10 length by the nonconductive section.

2. The method according to claim 1, wherein the nonconductive section is of a material having elasticity.

15 3. The method according to claim 1, wherein the nonconductive section is of a material having elasticity and hetero-characteristics.

4. The method according to claim 1, wherein the 20 nonconductive section is of a material including silicon or rubber as a main component.

5. The method according to claim 1, wherein a desired sectional shape is formed at one end or both ends o 5 of the nonconductive section so that the shape of the end of the nonconductive section is imprinted on the end of the cut electroforming member by an electroforming process.

6. The method according to claim 1, wherein the 30 nonconductive section is divided into an upper section and a lower section.

7. The method according to claim 1, wherein the nonconductive section is made by injecting a liquid material into its die and hardening it.

8. The method according to claim 1, the electroforming member made by the nonconductive section is a ferrule that is used as a connecting member of an optical cable.

9. The method according to any one of claims 1 to 8, further comprising the steps of covering a core material passing through a die with a forming material existing at a melted state or a partially melted state in the die, thinly coating the forming material with a conductive material after it is hardened, forming an electroforming member by connecting a negative electrode to the conductive coating portion and performing an electroforming process in an electroforming tub, removing the core material in the electroforming member by a drawing process, and washing the inside of the electroforming member.

10. The method according to claim 9, wherein the forming material is softened by heat to remove the core material .

11. The method according to claim 9, wherein the forming material is contracted with the lapse of time to remove the core material.

12. The method according to claim 9, wherein the forming material includes at least one of resin, pitch, and wax.

13. The method according to claim 9, wherein the forming material includes resin and a low temperature heat melting material.

14. The method according to claim 13, wherein the resin is epoxy resin.

15. The method according to claim 9, wherein the forming material includes silicon.

16. The method according to claim 9, wherein the electroforming layer includes two or more multiple layers of different kinds of metals.

17. The method according to claim 9, wherein the forming material passed through the die has a non-circular shape .

18. The method according to claim 9, wherein the coated conductive material is thinly formed on the forming material by vacuum deposition.

19. The method according to claim 9, wherein the coated conductive material is thinly deposited on the forming material by a chemical method.

20. The method according to claim 9, wherein the conductive material coated by the chemical method is chemical silver.

21. The method according to claim 9, wherein the core material is metal material having strong tension.

22. The method according to claim 9, wherein the core material is covered with the forming material within the range of 2 microns to 7 microns.

23. A cut electroforming member made by the steps of: performing an electroforming process in an electroforming tub by connecting a negative electrode to a core material having a nonconductive section and a positive electrode to a melted metal; and cutting the electroforming member at a predetermined length by the nonconductive section.

24. The cut electroforming member according to claim 23, wherein the nonconductive section is of a material having elasticity.

25. The cut electroforming member according to claim 23, wherein the nonconductive section is of a material having elasticity and hetero-characteristics.

26. The cut electroforming member according to claim 23, wherein the nonconductive section is of a material including silicon or rubber as a main component.

27. The cut electroforming member according to claim 23, wherein a desired sectional shape is formed at one end or both ends of the nonconductive section so that the shape of the end of the nonconductive section is imprinted on the end of the cut electroforming member by an electroforming process.

28. The cut electroforming member according to claim 23, wherein the nonconductive section is divided into an upper section and a lower section.

29. The cut electroforming member according to claim 23, wherein the nonconductive section is made by injecting a liquid material into its die and hardening it.

30. The cut electroforming member according to claim 23, the electroforming member made by the nonconductive section is a ferrule that is used as a connecting member of an optical cable.

31. The cut electroforming member according to any one of claims 23 to 30, the forming material is kept in a die at a melted state or a partially melted state and is covered on the core material when the core material passes through the die, the forming material is thinly coated with a conductive material after it is hardened, an electroforming layer is formed by connecting a negative electrode to the conductive coating portion and performing an electroforming process in an electroforming tub, the core material in the electroforming member is removed by a drawing process, and the inside of the electroforming member is washed.

32. The cut electroforming member according to claim 31, wherein the forming material is softened by heat to remove the core material .

33. The cut electroforming member according to claim 31, wherein the forming material is contracted with the lapse of time to remove the core material.

34. The cut electroforming member according to claim 25, wherein the forming material includes at least one of resin, pitch, and wax.

35. The cut electroforming member according to claim 31, wherein the forming material includes resin and a low temperature heat melting material.

36. The cut electroforming member according to claim 35, wherein the resin is epoxy resin.

37. The cut electroforming member according to claim 31, wherein the forming material includes silicon.

38. The cut electroforming member according to claim 31, wherein the electroforming layer includes two or more multiple layers of different kinds of metals.

39. The cut electroforming member according to claim 31, wherein the forming material passed through the die has a non-circular shape.

40. The cut electroforming member according to claim 31, wherein the coated conductive material is thinly formed on the forming material by vacuum deposition.

41. The cut electroforming member according to claim 31, wherein the coated conductive material is thinly deposited on the forming material by a chemical method.

42. The cut electroforming member according to claim 41, wherein the conductive material coated by the chemical method is chemical silver.

43. The cut electroforming member according to claim 31, wherein the core material is metal material having strong tension.

44. The cut electroforming member according to claim 31, wherein the core material is covered with the forming material within the range of 2 microns to 7 microns.