Method for manufacturing enameled copper wire

Abstract

To provide a method for manufacturing an enameled copper wire capable of suppressing generation of an appearance abnormal part.SOLUTION: In the method for manufacturing the enameled copper wire, a copper wire is continuously subjected to cold wire drawing using a wire drawing die to produce a drawn copper wire material, and the surface of the drawn copper wire material is coated with an enamel paint and baked. The copper powder adhering to the surface of at least one of the copper wire and the drawn copper wire material is removed using a knitted wiping cloth using split microfibers. Further, for example, a drawing lubricant is sprayed on the surface of the copper wire. For example, the copper powder adhering to the surface of the copper drawn wire material is removed using felt.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing enameled copper wire. [Background technology]

[0002] Enameled copper wire comprises a conductor and an enamel coating. The conductor is primarily made of copper. The enamel coating covers the surface of the conductor. The manufacturing method for enameled copper wire involves applying enamel paint to the surface of the conductor to form a coating. The enamel coating is then formed by baking.

[0003] An example of an enameled copper wire is the rectangular enameled copper wire described in Patent Document 1. The conductor of the rectangular enameled copper wire is a rectangular drawn copper wire material. The rectangular drawn copper wire material is a conductor having a rectangular cross section. The rectangular drawn copper wire material is produced by continuously cold drawing a rectangular copper wire using a rectangular wire drawing die. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-43704 Summary of the Invention [Problem to be solved by the invention]

[0005] Copper powder is generated during the production of rectangular enameled copper wire. The generated copper powder is pressed onto the rectangular copper wire. The pressed copper powder peels off from the rectangular copper wire using a wire drawing die, painting die, capstan, etc. When enamel paint is applied to the surface of the rectangular copper wire, bubbles form on the surface of the rectangular copper wire, originating from the areas where the copper powder has peeled off or where the copper powder is pressed. The areas where bubbles have occurred become areas with an abnormal appearance (hereinafter referred to as "visually abnormal areas").

[0006] The technology described in Patent Document 1 attempts to remove copper powder adhering to a rectangular copper wire by passing the wire between two rollers whose outermost layers are made of felt. However, with the technology described in Patent Document 1, it was difficult to sufficiently remove copper powder adhering to the rectangular copper wire and prevent the occurrence of visual defects.

[0007] In one aspect of the present disclosure, it is preferable to provide a method for producing an enameled copper wire that can suppress the occurrence of visual defects. [Means for solving the problem]

[0008] One aspect of the present disclosure is a method for producing an enameled copper wire, which comprises continuously cold drawing a copper wire using a wire drawing die to produce a drawn copper wire material, and then applying and baking an enamel coating to the surface of the drawn copper wire material. When producing the enameled copper wire, copper powder adhering to the surface of at least one of the copper wire and the drawn copper wire material is removed using a knitted wiping cloth made of split microfiber.

[0009] According to a method for producing an enameled copper wire that is one aspect of the present disclosure, it is possible to suppress the occurrence of visual defects in the enameled copper wire. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing the configuration of a manufacturing device for a rectangular enameled copper wire. [Figure 2] FIG. 2 is a cross-sectional view showing the cross-sectional shape of a rectangular copper wire. [Figure 3] FIG. 2 is a cross-sectional view showing the cross-sectional shape of a drawn rectangular copper wire. [Figure 4] FIG. 2 is an explanatory diagram showing the processing performed in the vicinity of the flat wire drawing machine. [Figure 5] FIG. 3 is an explanatory diagram illustrating the configuration of the first copper powder removal section as viewed from an upstream perspective. [Figure 6] FIG. 4 is an explanatory diagram illustrating the configuration of the second copper powder removal section as viewed from an upstream perspective. [Figure 7] FIG. 4 is an explanatory diagram showing the configuration of the third copper powder removal section as seen from an upstream viewpoint. [Figure 8] Fig. 8A is an electron microscope photograph of copper powder adhering to wool felt after a rectangular enameled copper wire was manufactured by replacing the upper cross section, lower cross section, right cross section, and left cross section with wool felt. Fig. 8B is an electron microscope photograph of copper powder adhering to the surfaces of the upper cross section, lower cross section, right cross section, and left cross section after a rectangular enameled copper wire was manufactured by the method described in the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. First Embodiment 1.Outline of manufacturing method for rectangular enamelled copper wire An outline of a method for manufacturing a rectangular enameled copper wire will be explained with reference to Figs. 1 to 3. The rectangular enameled copper wire corresponds to an enameled copper wire. The method for manufacturing a rectangular enameled copper wire uses a rectangular enameled copper wire manufacturing apparatus 1 shown in Fig. 1. The rectangular enameled copper wire manufacturing apparatus 1 includes a dance ring or bobbin 3, a round wire drawing machine 5, a rectangular rolling mill 7, an annealing furnace 9, a rectangular wire drawing machine 11, an annealing furnace 13, a paint applicator 15, a baking furnace 17, and a winder 19.

[0012] A linear conductor 23 is wound around the dance wheel or bobbin 3. The conductor 23 is drawn out from the dance wheel or bobbin 3, travels along a route that passes through a round wire drawing machine 5, a flat rolling mill 7, an annealing furnace 9, a flat wire drawing machine 11, an annealing furnace 13, a coating machine 15, and a baking furnace 17 in this order, and is wound onto a winder 19. However, the processed conductor 23, which is a flat copper drawn wire material 23B described below, passes through the section including the coating machine 15 and the baking furnace 17 multiple times.

[0013] The conductor 23 is made of copper or a copper alloy. The cross-sectional shape of the conductor 23 is circular until it is subjected to flat-rolling, which will be described later. The cross-section of the conductor 23 is a cross section perpendicular to the longitudinal direction of the conductor 23.

[0014] The round wire drawing machine 5 draws the conductor 23, which has a circular cross-sectional shape. The flat rolling machine 7 performs flat rolling on the traveling conductor 23. The conductor 23 that has undergone flat rolling is called a flat copper wire 23A. As shown in FIG. 2, the cross-sectional shape of the flat copper wire 23A is a shape consisting of two parallel sides 24A, 24B and two arc-shaped end faces 26A, 26B. In the cross-section, the sides 24A, 24B are straight. In the cross-section, the length of the sides 24A, 24B is greater than the length of the end faces 26A, 26B. The annealing furnace 9 anneals the flat copper wire 23A.

[0015] The flat wire drawing machine 11 performs flat wire drawing on the running flat copper wire 23A. Flat wire drawing is a process in which the flat copper wire 23A is continuously cold-drawn using a flat wire drawing die 30, which will be described later. The conductor 23 that has undergone flat wire drawing is referred to as a flat copper wire material 23B. The configuration of the flat wire drawing machine 11 will be described later.

[0016] The cross-sectional shape of the drawn rectangular copper wire material 23B is a rounded rectangle, as shown in Fig. 3. The long sides of the rounded rectangle are sides 24A and 24B. The short sides 22A and 22B of the rounded rectangle are sides that originate from end faces 26A and 26B of the rectangular copper wire 23A.

[0017] As shown in Figure 1, in the rectangular wire drawing machine 11, the direction in which the conductor 23 travels is referred to as the traveling direction TR. The opposite direction to the traveling direction TR is referred to as the upstream direction US. The annealing furnace 13 anneals the rectangular copper wire material 23B. The paint applicator 15 applies enamel paint to the surface of the rectangular copper wire material 23B, thereby forming an enamel paint film of a predetermined thickness on the surface of the rectangular copper wire material 23B.

[0018] In the baking furnace 17, a coating of enamel paint of a predetermined thickness is formed on the traveling drawn rectangular copper wire material 23B by applying heat to bake it, thereby forming a coating. As shown in Figure 1, the application of enamel paint by the paint applicator 15 and the formation of the coating by the baking furnace 17 are repeated. As a result, a rectangular enameled copper wire 25 having a predetermined coating thickness is produced. The rectangular enameled copper wire 25 is taken up by the winder 19.

[0019] The coating is formed, for example, by the following method: An enamel coating is applied to the surface of the drawn rectangular copper wire 23B. The enamel coating is, for example, a coating containing a resin and a solvent. Next, the solvent in the enamel coating applied to the surface of the drawn rectangular copper wire 23B is evaporated, and the resin in the enamel coating is hardened. After the solvent has evaporated and the resin has hardened, the rectangular enameled copper wire 25 is formed.

[0020] 2. Processing performed around the flat wire drawing machine 11 The processes performed around the flat wire drawing machine 11 will be described with reference to Figs. 4 to 7. As shown in Fig. 4, the flat enameled copper wire manufacturing apparatus 1 includes a first copper powder removal unit 31 and a second copper powder removal unit 33 between the annealing furnace 9 and the flat wire drawing machine 11. The first copper powder removal unit 31 is located upstream US of the second copper powder removal unit 33.

[0021] As shown in Fig. 5, the first copper powder removal unit 31 includes an upper substrate 41, a lower substrate 43, an upper cross portion 45, and a lower cross portion 47. The upper substrate 41 and the lower substrate 43 are each a plate-like member with a horizontal main surface. The upper substrate 41 and the lower substrate 43 are each made of a highly rigid material such as metal. The upper substrate 41 is located above the lower substrate 43.

[0022] The upper cross portion 45 and the lower cross portion 47 are each a plate-shaped member with a horizontal main surface. The upper cross portion 45 is fixed to the lower surface of the upper substrate 41. The lower cross portion 47 is fixed to the upper surface of the lower substrate 43. The upper cross portion 45 and the lower cross portion 47 face each other in the vertical direction.

[0023] The upper cross portion 45 has a core made of felt and a covering material that surrounds it. Therefore, the surface of the upper cross portion 45 is made of the covering material. The covering material is made of a knitted wiping cloth using split microfiber. The lower cross portion 47 has the same configuration as the upper cross portion 45.

[0024] The running flat copper wire 23A passes between the upper cross portion 45 and the lower cross portion 47. At this time, the side 24A of the flat copper wire 23A contacts the upper cross portion 45. In addition, the side 24B of the flat copper wire 23A contacts the lower cross portion 47.

[0025] The surfaces of the upper cross portion 45 and the lower cross portion 47 are made of a knitted wiping cloth using split microfiber, so that the sides 24A and 24B of the running rectangular copper wire 23A come into contact with the knitted wiping cloth using split microfiber, which removes copper powder adhering to the sides 24A and 24B of the rectangular copper wire 23A.

[0026] For example, the first copper powder removal section 31 can be moved intermittently in the right direction R or the left direction L. The right direction R is the right direction when viewed from a viewpoint in the upstream direction US. The left direction L is the left direction when viewed from a viewpoint in the upstream direction US. The right direction R and the left direction L are directions perpendicular to the longitudinal direction of the flat copper wire 23A. The perpendicular direction is one form of intersection.

[0027] Since the flat copper wire 23A does not move in the right direction R or the left direction L in the first copper powder removal section 31, when the first copper powder removal section 31 is moved in the right direction R or the left direction L, the first copper powder removal section 31 moves in the right direction R or the left direction L relative to the flat copper wire 23A. Moving intermittently means, for example, alternating between a time period when the first copper powder removal section 31 does not move in the right direction R or the left direction L and a time period when it moves in the right direction R or the left direction L.

[0028] When the first copper powder removal section 31 is moved intermittently in the right direction R or the left direction L, portions of the surfaces of the upper cross section 45 and the lower cross section 47 that have not previously been in contact with the flat copper wire 23A can be brought into contact with the flat copper wire 23A, thereby further increasing the effect of removing copper powder adhering to the sides 24A and 24B of the flat copper wire 23A.

[0029] Furthermore, when the first copper powder removal section 31 is moved intermittently in the right direction R or the left direction L, the portions of the surfaces of the upper cross section 45 and the lower cross section 47 that were previously in contact with the flat copper wire 23A can be prevented from subsequently coming into contact with the flat copper wire 23A. As a result, damage to the flat copper wire 23A caused by copper powder captured by the upper cross section 45 and the lower cross section 47 can be prevented.

[0030] As shown in Fig. 6, the second copper powder removal unit 33 includes a right substrate 51, a left substrate 53, a right cross portion 55, and a left cross portion 57. The right substrate 51 and the left substrate 53 are each a plate-like member whose main surface is a vertical plane and parallel to the upstream direction US. The right substrate 51 and the left substrate 53 are each made of a highly rigid material such as metal. When viewed from a viewpoint in the upstream direction US, the right substrate 51 is located to the right in the direction R of the left substrate 53.

[0031] The right cross portion 55 and the left cross portion 57 are each a plate-shaped member whose main surface is a vertical plane and parallel to the upstream direction US. The right cross portion 55 is fixed to the surface of the right base plate 51 facing the left direction L. The left cross portion 57 is fixed to the surface of the left base plate 53 facing the right direction R. The right cross portion 55 and the left cross portion 57 face each other in the right direction R and the left direction L.

[0032] The right cross portion 55 and the left cross portion 57 have the same configuration as the upper cross portion 45 and the lower cross portion 47. The running flat copper wire 23A passes between the right cross portion 55 and the left cross portion 57. At this time, the end surface 26B of the flat copper wire 23A contacts the right cross portion 55. In addition, the end surface 26A of the flat copper wire 23A contacts the left cross portion 57.

[0033] The surfaces of the right cross section 55 and the left cross section 57 are made of a knitted wiping cloth using split microfiber, so that the end faces 26A and 26B of the running rectangular copper wire 23A come into contact with the knitted wiping cloth using split microfiber, which removes copper powder adhering to the end faces 26A and 26B of the rectangular copper wire 23A.

[0034] For example, the second copper powder removal section 33 can be moved intermittently in the vertical direction. The vertical direction is a direction perpendicular to the longitudinal direction of the rectangular copper wire 23A. The perpendicular direction is a form of intersection. Since the rectangular copper wire 23A does not move vertically in the second copper powder removal section 33, when the second copper powder removal section 33 is moved vertically, the second copper powder removal section 33 moves vertically relative to the rectangular copper wire 23A. Moving intermittently means, for example, alternating between time periods when the second copper powder removal section 33 does not move vertically and time periods when it does move vertically.

[0035] When the second copper powder removal section 33 is moved intermittently in the vertical direction, portions of the surfaces of the right cross section 55 and the left cross section 57 that have not previously been in contact with the flat copper wire 23A can be brought into contact with the flat copper wire 23A, thereby further increasing the effect of removing copper powder adhering to the end faces 26A and 26B of the flat copper wire 23A.

[0036] Furthermore, when the second copper powder removal section 33 is moved intermittently in the vertical direction, the portions of the surfaces of the right cross section 55 and the left cross section 57 that were previously in contact with the flat copper wire 23A can be prevented from subsequently coming into contact with the flat copper wire 23A. As a result, damage to the flat copper wire 23A caused by the copper powder captured by the right cross section 55 and the left cross section 57 can be prevented.

[0037] As shown in FIG. 4, the flat wire drawing machine 11 includes a flat wire drawing die 30, a spray nozzle 61, and a cover box 63. A flat copper wire 23A is continuously cold drawn using the flat wire drawing die 30. The spray nozzle 61 sprays wire drawing lubricant onto the surface of the flat copper wire 23A in the upstream direction US from the flat wire drawing die 30. The cover box 63 is a hollow box-shaped member. The cover box 63 houses the flat wire drawing die 30 and the spray nozzle 61. The cover box 63 prevents the wire drawing lubricant sprayed from the spray nozzle 61 from scattering around.

[0038] As shown in FIG. 4, the manufacturing apparatus 1 for rectangular enameled copper wire includes a third copper powder removal section 71 and a dust collection box 73 between a rectangular wire drawing machine 11 and an annealing furnace 13. As shown in FIG. 7, the third copper powder removal section 71 is a plate-shaped member made of felt. The main surface of the third copper powder removal section 71 is perpendicular to the upstream direction US. The third copper powder removal section 71 has a slit 75 formed therein, extending from its end toward the center. The slit 75 penetrates the third copper powder removal section 71 in its thickness direction.

[0039] The traveling flat rectangular copper wire material 23B passes through the rear portion of the slit 75. The traveling flat rectangular copper wire material 23B comes into contact with the portion of the third copper powder removal section 71 that faces the slit 75. Therefore, the third copper powder removal section 71 removes copper powder adhering to the surface of the flat rectangular copper wire material 23B.

[0040] The dust collection box 73 is located in the traveling direction TR further than the third copper powder removal section 71. The traveling drawn rectangular copper wire material 23B passes through the dust collection box 73. The air inside the dust collection box 73 is sucked in. Therefore, the dust collection box 73 can remove copper powder adhering to the surface of the drawn rectangular copper wire material 23B. A mechanism including the flat wire drawing machine 11, the third copper powder removal unit 71, and the dust collection box 73 is referred to as a flat wire drawing mechanism. In this embodiment, an example in which there is one flat wire drawing mechanism has been shown, but two such flat wire drawing mechanisms may be installed in tandem.

[0041] 3. Benefits of the manufacturing method for rectangular enamelled copper wire (1A) In the method for manufacturing a rectangular enameled copper wire according to the present disclosure, copper powder adhering to the surface of the rectangular copper wire 23A is removed using an upper cross section 45 and a lower cross section 47, the surfaces of which are covered with knitted wiping cloths made of split microfiber. Knitted wiping cloths made of split microfiber have fine, densely packed fibers. Therefore, knitted wiping cloths made of split microfiber are highly effective at removing fine copper powder. As a result, the occurrence of visual defects in the manufactured rectangular enameled copper wire 25 can be suppressed.

[0042] (1B) In the method for manufacturing a rectangular enameled copper wire according to the present disclosure, a wiredrawing lubricant is sprayed onto the surface of the rectangular copper wire 23A. This allows for more effective removal of copper powder adhering to the surface of the rectangular copper wire 23A. As a result, the occurrence of visual defects in the manufactured rectangular enameled copper wire 25 can be further suppressed.

[0043] (1C) In the method for producing a rectangular enameled copper wire according to the present disclosure, copper powder adhering to the surface of the drawn rectangular copper wire material 23B is removed using a third copper powder removal unit 71 made of felt, which further reduces the occurrence of visual defects in the produced rectangular enameled copper wire 25.

[0044] (1D) In ​​the method for manufacturing a rectangular enameled copper wire according to the present disclosure, the upper cross portion 45 and the lower cross portion 47, whose surfaces are covered with a knitted wiping cloth made of split microfiber, can be moved intermittently in a direction intersecting the longitudinal direction of the rectangular copper wire 23A. This further enhances the effectiveness of removing copper powder adhering to the surface of the rectangular copper wire 23A. Furthermore, this also prevents the rectangular copper wire 23A from being damaged by copper powder trapped in the upper cross portion 45 and the lower cross portion 47.

[0045] Furthermore, in the method for manufacturing a rectangular enameled copper wire according to the present disclosure, the right cross portion 55 and the left cross portion 57, whose surfaces are covered with a knitted wiping cloth made of split microfiber, can be moved intermittently in a direction intersecting the longitudinal direction of the rectangular copper wire 23A. This further enhances the effectiveness of removing copper powder adhering to the surface of the rectangular copper wire 23A. Furthermore, this also prevents the rectangular copper wire 23A from being damaged by copper powder trapped in the right cross portion 55 and the left cross portion 57.

[0046] <Example> 1. Manufacturing method for rectangular enameled copper wire A rectangular enameled copper wire 25 was manufactured by the method described in the first embodiment. The knitted wiping cloths made of split microfibers that constituted the surfaces of the upper cross section 45, the lower cross section 47, the right cross section 55, and the left cross section 57 were Techno Wiper CRN500 manufactured by Miraikosen Co., Ltd. Techno Wiper CRN500 was composed of polyester fiber and nylon fiber. The fiber diameter of Techno Wiper CRN500 was approximately 5 μm.

[0047] 2. Evaluation of copper powder removal After producing the rectangular enameled copper wire 25, the copper powder adhering to the surfaces of the upper cross portion 45, the lower cross portion 47, the right cross portion 55, and the left cross portion 57 (i.e., the copper powder removed from the surface of the rectangular copper wire 23A) was transferred to carbon tape. The surface of the carbon tape after transfer was photographed using an electron microscope. The photograph is shown in Figure 8B.

[0048] As a comparative example, a rectangular enameled copper wire 25 was manufactured under the same conditions except that the upper cross portion 45, the lower cross portion 47, the right cross portion 55, and the left cross portion 57 were replaced with wool felt. After manufacturing the rectangular enameled copper wire 25, the copper powder adhering to the surface of the wool felt was transferred to carbon tape. The surface of the carbon tape after transfer was photographed using an electron microscope. The photograph is shown in Figure 8A.

[0049] As shown in Figure 8B, when the upper cross portion 45, the lower cross portion 47, the right cross portion 55, and the left cross portion 57 were used, a large amount of fine copper powder with a size of about 10 μm or more was removed from the surface of the rectangular copper wire 23A. As shown in Figure 8A, when wool felt was used, only large copper powder with a size of about 50 μm or more was removed from the surface of the rectangular copper wire 23A. Furthermore, only a small amount of copper powder was removed.

[0050] <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0051] (1) The method for manufacturing an enameled copper wire according to the present disclosure may be used to manufacture an enameled copper wire other than a rectangular enameled copper wire. The conductor from which copper powder is removed by the first copper powder removal unit 31, the second copper powder removal unit 33, and the third copper powder removal unit 71 does not have to be a rectangular conductor, and may be, for example, a round conductor.

[0052] (2) The first copper powder removal section 31 and the second copper powder removal section 33 may be provided, for example, at a position closer to the traveling direction TR than the flat wire drawing die 30. In this case, the first copper powder removal section 31 and the second copper powder removal section 33 can remove copper powder from the surface of the flat copper drawn wire material 23B.

[0053] Furthermore, the first copper powder removal section 31 and the second copper powder removal section 33 may be provided, for example, both at the position in the first embodiment and at a position closer to the running direction TR than the flat wire drawing die 30. In this case, copper powder can be removed from the surface of the flat copper wire 23A, and copper powder can also be removed from the surface of the flat copper drawn wire material 23B.

[0054] (3) The function of one component in each of the above embodiments may be shared among multiple components, or the functions of multiple components may be performed by one component. Also, part of the configuration of each of the above embodiments may be omitted. Furthermore, at least part of the configuration of each of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0055] (4) In addition to the above-described method for manufacturing a rectangular enameled copper wire, the present disclosure can also be realized in various forms, such as a manufacturing apparatus for a rectangular enameled copper wire, a rectangular enameled copper wire, etc.

[0056] [Technical idea disclosed in this specification] [Item 1] Copper wire is produced by continuously cold drawing copper wire using a wire drawing die. Applying enamel paint to the surface of the drawn copper wire material and baking it; A method for producing an enameled copper wire, comprising: Using a knitted wiping cloth made of split microfiber, copper powder adhering to the surface of at least one of the copper wire and the drawn copper wire material is removed. Manufacturing method of enamelled copper wire. [Item 2] A method for producing an enameled copper wire according to item 1, A wiredrawing lubricant is sprayed onto the surface of the copper wire. Manufacturing method of enamelled copper wire. [Item 3] Item 1 or 2. A method for producing an enameled copper wire, Further, copper powder adhering to the surface of the drawn copper wire material is removed using felt. Manufacturing method of enamelled copper wire.

[0057] [Item 4] A method for producing an enameled copper wire according to any one of items 1 to 3, The knitted wiping cloth using the split microfiber is intermittently moved in a direction intersecting the longitudinal direction of the copper wire and the drawn copper wire material. Manufacturing method of enamelled copper wire.

[0058] [Item 5] A method for producing an enameled copper wire according to any one of items 1 to 4, The copper wire is a rectangular copper wire, The wire drawing die is a rectangular wire drawing die, The drawn copper wire material is a drawn rectangular copper wire material, The enameled copper wire is a rectangular enameled copper wire. Manufacturing method of enamelled copper wire. [Explanation of symbols]

[0059] 1... manufacturing equipment, 3... dance ring or bobbin, 5... round wire drawing machine, 7... flat wire rolling machine, 9... annealing furnace, 11... flat wire drawing machine, 13... annealing furnace, 15... paint application machine, 17... baking furnace, 19... winding machine, 22A, 22B... short side, 23... conductor, 23A... flat copper wire, 23B... flat copper wire drawing material, 24A, 24B... side, 25... flat enameled copper wire, 26A, 26B... end face, 30... Flat wire drawing die, 31...first copper powder removal section, 33...second copper powder removal section, 41...upper substrate, 43...lower substrate, 45...upper cross section, 47...lower cross section, 51...right side substrate, 53...left side substrate, 55...right side cross section, 57...left side cross section, 61...spray nozzle, 63...cover box, 71...third copper powder removal section, 73...dust collection box, 75...slit

Claims

1. Copper wire is produced by continuously cold drawing copper wire using a wire drawing die. Applying enamel paint to the surface of the drawn copper wire material and baking it; A method for producing an enameled copper wire, comprising: Using a knitted wiping cloth made of split microfiber, copper powder adhering to the surface of at least one of the copper wire and the drawn copper wire material is removed. Manufacturing method of enamelled copper wire.

2. A method for producing an enameled copper wire according to claim 1, A wiredrawing lubricant is sprayed onto the surface of the copper wire. Manufacturing method of enamelled copper wire.

3. A method for producing an enameled copper wire according to claim 1 or 2, Further, copper powder adhering to the surface of the drawn copper wire material is removed using felt. Manufacturing method of enamelled copper wire.

4. A method for producing an enameled copper wire according to claim 1 or 2, The knitted wiping cloth using the split microfiber is intermittently moved in a direction intersecting the longitudinal direction of the copper wire and the drawn copper wire material. Manufacturing method of enamelled copper wire.

5. A method for producing an enameled copper wire according to claim 1 or 2, The copper wire is a rectangular copper wire, The wire drawing die is a rectangular wire drawing die, The drawn copper wire material is a drawn rectangular copper wire material, The enameled copper wire is a rectangular enameled copper wire. Manufacturing method of enamelled copper wire.

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