Apparatus for manufacturing enameled copper wire and method for manufacturing enameled copper wire

Abstract

To provide an apparatus for manufacturing an enameled copper wire and a method for manufacturing an enameled copper wire that can reduce generation of a portion with an appearance defect.SOLUTION: An apparatus for manufacturing an enameled copper wire includes a wire drawing section, a coating and baking section, and a cooling section, wherein the wire drawing section produces a copper drawn wire by continuously performing cold drawing on a traveling copper wire using a drawing die, the coating and baking section applies an enamel paint to a surface of the copper drawn wire and bakes the applied enamel paint, and the cooling section cools the copper wire such that a temperature of the copper wire at a position located in a traveling direction of the copper wire relative to an outlet end surface of the drawing die and at a distance of 6 cm from the end surface is 70°C or less.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] An enameled copper wire comprises a conductor and an enamel coating. The conductor is mainly made of copper. The enamel coating covers the surface of the conductor. Patent Document 1 describes a method for manufacturing an enameled copper wire. In this method, an enamel paint is applied to the surface of the conductor to form a coating. The enamel coating is then formed by baking. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6730930 Summary of the Invention [Problem to be solved by the invention]

[0004] Enameled copper wire includes rectangular enameled copper wire. The conductor of rectangular enameled copper wire is rectangular drawn copper wire material. Rectangular drawn copper wire material is a conductor with a rectangular cross section. Rectangular drawn copper wire material is produced by continuously cold drawing rectangular copper wire using a rectangular wire drawing die.

[0005] A wiredrawing lubricant is supplied to the interface between the flat copper wire and the flat wiredrawing die. When the temperature of the wiredrawing lubricant rises at the interface between the flat copper wire and the flat wiredrawing die, the viscosity and lubricity of the wiredrawing lubricant decrease. When the viscosity and lubricity of the wiredrawing lubricant decrease, friction between the flat copper wire and the flat wiredrawing die increases, causing the flat copper wire to wear and generate copper powder. The generated copper powder adheres to the flat copper wire. The copper powder adhered to the flat copper wire tends to trap microbubbles when a coating is formed. The microbubbles foam when the coating is baked, causing appearance defects in the flat enameled copper wire.

[0006] In one aspect of the present disclosure, it is preferable to provide an apparatus for manufacturing an enameled copper wire and a method for manufacturing an enameled copper wire that can suppress the occurrence of visually defective parts. [Means for solving the problem]

[0007] One aspect of the present disclosure is an apparatus for producing an enameled copper wire, the apparatus comprising: a wire drawing unit configured to produce a drawn copper wire material by continuously cold drawing a running copper wire using a wire drawing die; a coating and baking unit configured to apply an enamel coating to the surface of the drawn copper wire material and bake it; and a cooling unit configured to cool the copper wire so that the temperature of the copper wire is 70°C or less at a position that is closer to the end face of the exit side of the wire drawing die in the running direction of the copper wire and 6 cm away from the end face. The apparatus for producing an enameled copper wire, which is one aspect of the present disclosure, can suppress the occurrence of visual abnormalities.

[0008] Another aspect of the present disclosure is a method for producing an enameled copper wire, which includes continuously cold drawing a running 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. In the method for producing an enameled copper wire, the copper wire is cooled so that the temperature of the copper wire is 70°C or less at a position 6 cm away from the end face on the exit side of the wire drawing die, in the running direction of the copper wire. The method for producing an enameled copper wire, which is another aspect of the present disclosure, can suppress the occurrence of visual defects. [Brief explanation of the drawings]

[0009] [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. 1 is an explanatory diagram illustrating the configuration of a flat wire drawing machine according to a first embodiment. [Figure 5]FIG. 10 is an explanatory diagram showing the configuration of a flat wire drawing machine according to a second embodiment. [Figure 6] 10A and 10B are explanatory diagrams illustrating the configuration of a cooling unit in another embodiment. [Figure 7] FIG. 10 is an explanatory diagram showing the configuration of a rectangular wire drawing machine according to a third embodiment. [Figure 8] 1 is a graph showing the relationship between the wiredrawing lubricant temperature and the average number of appearance defects. [Figure 9] FIG. 10 is an explanatory diagram showing the configuration of a flat wire drawing machine according to a fourth embodiment. [Figure 10] FIG. 10 is an explanatory diagram illustrating the configuration of a nozzle unit and the like in a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Exemplary embodiments of the present disclosure will 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. A manufacturing apparatus 1 for rectangular enameled copper wire shown in Fig. 1 is used for the manufacturing method of the rectangular enameled copper wire. The manufacturing apparatus 1 for rectangular enameled copper wire 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. The rectangular wire drawing machine 11 corresponds to the wire drawing section. The paint applicator 15 and the baking furnace 17 correspond to the coating and baking sections.

[0011] 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.

[0012] The material of the conductor 23 is copper or a copper alloy. Therefore, the conductor 23 is a copper wire. 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.

[0013] 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.

[0014] 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 31, 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] The method for forming the enamel coating is, for example, as follows: An enamel paint is applied to the surface of the rectangular copper drawn wire material 23B. The enamel paint is, for example, a paint containing a resin and a solvent. Next, the solvent in the enamel paint applied to the surface of the rectangular copper drawn wire material 23B is evaporated, and the resin in the enamel paint is hardened. After the solvent has evaporated and the resin has hardened, the rectangular enameled copper wire 25 is formed.

[0019] 2. Configuration of the flat wire drawing machine 11 The configuration of the rectangular wire drawing machine 11 will be described with reference to Fig. 4. The rectangular wire drawing machine 11 includes a rectangular wire drawing die 31, a die holder 33, an injection nozzle 35, a first cooling section 37, and a second cooling section 39.

[0020] The flat wire drawing die 31 continuously cold-draws the flat copper wire 23A to produce a flat copper wire material 23B. The flat wire drawing die 31 has a flat-shaped processing hole 41. The conductor 23 passes through the processing hole 41 while traveling in the traveling direction TR. The conductor 23 before passing through the processing hole 41 is a flat copper wire 23A. The conductor 23 after passing through the processing hole 41 is a flat copper wire material 23B. The wire-entry speed of the flat copper wire 23A into the flat wire drawing die 31 is, for example, 15.5 m / min.

[0021] The die holder 33 holds the rectangular wire drawing die 31. The spray nozzle 35 sprays the wire drawing lubricant 43 toward the inlet side 31A of the rectangular wire drawing die 31. Examples of the wire drawing lubricant 43 include those containing water and a surfactant, and emulsion-based lubricants. An example of a commercially available wire drawing lubricant 43 is "Metalsyn N-150 Concentrate" manufactured by Kyoeisha Chemical Co., Ltd.

[0022] The first cooling section 37 is provided upstream of the flat wire drawing die 31 in the upstream direction US. The first cooling section 37 includes a cylindrical section 45 and a vortex cooler 47. The cylindrical section 45 is a hollow cylindrical member. The axial direction of the cylindrical section 45 is parallel to the upstream direction US. The flat copper wire 23A passes through the cylindrical section 45 and heads toward the flat wire drawing die 31.

[0023] The vortex cooler 47 is attached to the cylindrical portion 45. The vortex cooler 47 supplies cold air 40 into the cylindrical portion 45. Therefore, the flat copper wire 23A is cooled as it passes through the cylindrical portion 45. The first cooling portion 37 is a member configured to cool the flat copper wire 23A with the cold air 40.

[0024] The second cooling section 39 is a vortex cooler. The second cooling section 39 blows cold air 40 toward the entrance side 31A of the flat wire drawing die 31. As a result, the portion of the flat copper wire 23A near the entrance side 31A is cooled. The entrance side 31A is also cooled. The second cooling section 39 is a member configured to cool the flat copper wire 23A with the cold air 40.

[0025] The first cooling section 37 and the second cooling section 39 are controlled so that the temperature of the drawn rectangular copper wire material 23B at the temperature measurement position 51 is 70°C or less. The first cooling section 37 and the second cooling section 39 may be controlled by a control section equipped with a computer or by an operator. The higher the temperature of the drawn rectangular copper wire material 23B at the temperature measurement position 51, the more strongly the first cooling section 37 and the second cooling section 39 cool the drawn rectangular copper wire 23A.

[0026] The temperature measurement position 51 is located above the flat copper wire material 23B. The temperature measurement position 51 is located in the running direction TR from the end face 31B on the exit side of the flat wire drawing die 31. The distance D from the end face 31B to the temperature measurement position 51 is 6 cm. Note that the distance D is the distance in the running direction TR. The method for measuring the temperature at the temperature measurement position 51 is to use a thermocouple.

[0027] 3. Effects of the manufacturing device 1 and manufacturing method for rectangular enameled copper wire (1A) The manufacturing device 1 for flat rectangular enameled copper wire cools the flat rectangular copper wire 23A using the first cooling section 37 and the second cooling section 39 so that the temperature of the flat rectangular copper wire material 23B at the temperature measurement position 51 is 70°C or less.

[0028] The temperature of the drawn flat copper wire material 23B at the temperature measurement position 51 is close to the temperature at the interface between the flat copper wire 23A and the flat wire drawing die 31. Therefore, the manufacturing device 1 for flat enameled copper wire can keep the temperature at the interface between the flat copper wire 23A and the flat wire drawing die 31 at approximately 70°C or less.

[0029] Therefore, the temperature of the wiredrawing lubricant 43 is less likely to rise at the interface between the flat copper wire 23A and the flat wiredrawing die 31. When the temperature of the wiredrawing lubricant 43 is less likely to rise, the viscosity and lubricity of the wiredrawing lubricant 43 are less likely to decrease. For example, if the wiredrawing lubricant 43 contains water and a surfactant, when the temperature of the wiredrawing lubricant 43 is less likely to rise, the viscosity of the wiredrawing lubricant 43 is less likely to decrease. Furthermore, when the temperature of the wiredrawing lubricant 43 is less likely to rise, the surfactant is less likely to precipitate from the water, and the lubricity of the wiredrawing lubricant 43 is less likely to decrease. When the viscosity and lubricity of the wiredrawing lubricant 43 are less likely to decrease, friction between the flat copper wire 23A and the flat wiredrawing die 31 is less likely to increase, the flat copper wire 23A is less likely to wear, and copper powder is less likely to be generated. As a result, the flat enameled copper wire 25 is less likely to have an abnormal appearance.

[0030] (1B) The manufacturing apparatus 1 for rectangular enameled copper wire uses a first cooling section 37 and a second cooling section 39 to cool the rectangular copper wire 23A. This further enhances the cooling effect of the rectangular copper wire 23A. Furthermore, the first cooling section 37 and the second cooling section 39 use vortex coolers. The vortex cooler generates air pressure, which can remove copper powder and other foreign matter from the surface of the rectangular copper wire 23A. This improves adhesion between the conductor 23 and the enamel coating. Furthermore, using a vortex cooler reduces the manufacturing cost of the rectangular enameled copper wire 25 compared to cooling the entire building in which the manufacturing apparatus 1 is installed.

[0031] Second Embodiment 1. Differences from the first embodiment The second embodiment has the same basic configuration as the first embodiment, so differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0032] In the first embodiment described above, the flat wire drawing machine 11 includes the first cooling section 37 and the second cooling section 39. In contrast, in the second embodiment, as shown in Fig. 5, the flat wire drawing machine 11 is different from the first embodiment in that it includes a third cooling section 53 instead of the first cooling section 37 and the second cooling section 39.

[0033] The third cooling section 53 is provided adjacent to the flat wire drawing die 31 and at a position further upstream in the US direction than the flat wire drawing die 31. The third cooling section 53 includes a tank 55 and a wire drawing lubricant 43 stored in the tank 55. The wire drawing lubricant 43 stored in the tank 55 is cooled by a cooling device (not shown). The injection nozzle 35 supplies the wire drawing lubricant 43 into the tank 55. The wire drawing lubricant 43 stored in the tank 55 is in contact with the inlet side 31A.

[0034] The flat copper wire 23A passes through the wire drawing lubricant 43 stored in the tank 55 and heads toward the flat wire drawing die 31. The flat copper wire 23A is cooled as it passes through the wire drawing lubricant 43 stored in the tank 55. The third cooling section 53 is controlled so that the temperature of the flat copper wire material 23B at the temperature measurement position 51 is 70°C or lower. The third cooling section 53 may be controlled by a control section equipped with a computer or by an operator. The higher the temperature of the flat copper wire material 23B at the temperature measurement position 51, the more strongly the wire drawing lubricant 43 stored in the tank 55 is cooled.

[0035] 2. Effects of the manufacturing device 1 and manufacturing method for rectangular enameled copper wire According to the second embodiment described above in detail, the effect (1A) of the first embodiment described above is achieved, and further, the following effect is achieved.

[0036] (2A) The rectangular enameled copper wire manufacturing apparatus 1 uses the third cooling section 53 to cool the rectangular copper wire 23A, which further enhances the cooling effect of the rectangular copper wire 23A.

[0037] <Third embodiment> 1. Differences from the first embodiment The third embodiment has the same basic configuration as the first embodiment, so differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0038] In the first embodiment described above, the flat wire drawing machine 11 includes the first cooling section 37 and the second cooling section 39. In contrast, in the third embodiment, as shown in Fig. 7, the flat wire drawing machine 11 differs from the first embodiment in that it includes a wire drawing die box 71 and a circulation device 73, and in that it includes two injection nozzles 35.

[0039] The wiredrawing die box 71 is a hollow box-shaped member. The wiredrawing die box 71 houses the rectangular wiredrawing die 31, the die holder 33, and two injection nozzles 35. The wiredrawing die box 71 has an inlet 71A and an outlet 71B. The inlet 71A is a hole formed on the upstream direction US side of the wiredrawing die box 71. The outlet 71B is a hole formed on the traveling direction TR side of the wiredrawing die box 71.

[0040] The running conductor 23 enters the wire drawing die box 71 from the entrance 71A and passes through the exit 71B to exit the wire drawing die box 71. The wire drawing die box 71 has a discharge hole 71C. The discharge hole 71C is a hole formed in the bottom 71D of the wire drawing die box 71.

[0041] The circulation device 73 includes a pipe 75, a filter 77, and a cooling unit 79. The pipe 75 extends from the discharge hole 71C to the two injection nozzles 35. The pipe 75 branches into branch pipes 75A and 75B near the two injection nozzles 35. The branch pipe 75A is connected to one injection nozzle 35, and the branch pipe 75B is connected to the other injection nozzle 35. The pipe 75 is located outside the wire drawing die box 71 except for portions of the branch pipes 75A and 75B.

[0042] The wiredrawing lubricant 43 sprayed from the two spray nozzles 35 hits the inlet side 31A of the rectangular wiredrawing die 31, then drops onto the bottom 71D, passes through the discharge hole 71C, and enters the piping 75. Some of the wiredrawing lubricant 43 hits the inlet side 31A, passes through the processing hole 41, and drops onto the bottom 71D.

[0043] The wiredrawing lubricant 43 that has entered the pipe 75 flows through the pipe 75 and is sent to the two spray nozzles 35. The wiredrawing lubricant 43 sent to the two spray nozzles 35 is sprayed again from the two spray nozzles 35. A pump (not shown) causes the wiredrawing lubricant 43 to flow as described above.

[0044] The filter 77 is provided midway through the pipe 75. The wiredrawing lubricant 43 flowing through the pipe 75 passes through the filter 77. The wiredrawing lubricant 43 that falls from the rectangular wiredrawing die 31 to the bottom 71D contains copper powder 81. The filter 77 collects the copper powder 81. Therefore, the number of copper powder 81 contained in the wiredrawing lubricant 43 that has passed through the filter 77 is smaller than the number of copper powder 81 contained in the wiredrawing lubricant 43 before passing through the filter 77.

[0045] The cooling unit 79 is provided midway through the piping 75. The position of the cooling unit 79 is, for example, downstream of the filter 77. The downstream side refers to the downstream side in the flow direction of the wiredrawing lubricant 43. The cooling unit 79 cools the wiredrawing lubricant 43 flowing through the piping 75.

[0046] The cooling unit 79 is controlled so that the temperature of the wiredrawing lubricant 43 sprayed from the spray nozzle 35 (hereinafter referred to as the wiredrawing lubricant temperature) is less than 26°C. The cooling unit 79 may be controlled by a control unit equipped with a computer or by an operator. The higher the wiredrawing lubricant temperature, the more strongly the cooling unit 79 cools the wiredrawing lubricant 43.

[0047] The wiredrawing lubricant temperature is measured as follows: A thermocouple is attached to the outer periphery of the spray nozzle 35, and a heat insulating material is wrapped around the outside of the thermocouple. In this state, the temperature is measured using the thermocouple. Note that since the spray nozzle 35 is made of metal and has high thermal conductivity, the temperature of the spray nozzle 35 measured using the thermocouple can be considered to be the wiredrawing lubricant temperature.

[0048] When the wire drawing lubricant temperature is less than 26°C, the temperature of the drawn rectangular copper wire material 23B at the temperature measurement position 51 is 70°C or less. Therefore, the cooling unit 79 is controlled so that the temperature of the drawn rectangular copper wire material 23B at the temperature measurement position 51 is 70°C or less.

[0049] 2. Effects of the manufacturing device 1 and manufacturing method for rectangular enameled copper wire According to the third embodiment described above in detail, the effect (1A) of the first embodiment described above is achieved, and further, the following effect is achieved. (3A) The cooling section 79 cools the wiredrawing lubricant 43. The spray nozzle 35 sprays the cooled wiredrawing lubricant 43 toward the inlet side 31A of the flat wiredrawing die 31. The cooled wiredrawing lubricant 43 cools the flat copper wire 23A. Therefore, the cooling section 79 cools the flat copper wire 23A with the cooled wiredrawing lubricant 43. The temperature of the wiredrawing lubricant is less than 26°C. Therefore, the effect of cooling the flat copper wire 23A is even greater. The cooled wiredrawing lubricant 43 corresponds to a cooled liquid.

[0050] 3. Working Example Using the flat enameled copper wire manufacturing apparatus 1 of this embodiment, flat enameled copper wires 25 were manufactured. When manufacturing the flat enameled copper wires 25, the wiredrawing lubricant temperature was varied. The average number of appearance defects in the manufactured flat enameled copper wires 25 at each wiredrawing lubricant temperature was calculated.

[0051] A method for detecting appearance defects in rectangular enameled copper wire 25 is described in JP 2019-138814 A. Specifically, the method is as follows: At position X on the surface of rectangular enameled copper wire 25, the surface height is measured using an optical displacement sensor. The surface height is the difference in height between a normal portion and a convex portion on the surface of rectangular enameled copper wire 25.

[0052] At position X, a CCD camera is used to photograph the surface of the rectangular enameled copper wire 25 and acquire an image. Next, image processing is performed on the image to detect the shape contained in the image. Next, the area of ​​the detected shape is calculated.

[0053] If the surface height or the shape area at position X exceeds the reference value, it is determined that a visual defect exists at position X. On the other hand, if the surface height and the shape area at position X do not exceed the reference value, it is determined that no visual defect exists at position X. The above measurement and determination are repeated while changing position X. Based on the results, the average number of visual defects is calculated.

[0054] The average number of visual defects at each wiredrawing lubricant temperature is shown in Figure 8. When the wiredrawing lubricant temperature was below 26°C, the average number of visual defects was even lower. When the wiredrawing lubricant temperature was below 25°C, the average number of visual defects was particularly low. When the wiredrawing lubricant temperature was below 26°C, the temperature of the drawn flat copper wire material 23B at the temperature measurement position 51 was below 70°C.

[0055] <Fourth embodiment> 1. Differences from the third embodiment The fourth embodiment has the same basic configuration as the third embodiment, and therefore differences will be described below. Note that the same reference numerals as those in the third embodiment indicate the same configuration, and reference will be made to the preceding description.

[0056] 9 and 10, in the fourth embodiment, the rectangular wire drawing machine 11 further includes pipes 91A and 91B and nozzle units 93A and 93B. The pipe 91A is a pipe branched off from the branch pipe 75A. The pipe 91B is a pipe branched off from the branch pipe 75B.

[0057] The nozzle unit 93A is a member that sprays the supplied liquid. The nozzle unit 93A is located above the rectangular copper wire 23A. The nozzle unit 93A is composed of three coolant flare nozzles 101, 103, and 105. The coolant flare nozzles 101, 103, and 105 are arranged in a row along the traveling direction TR. Each of the coolant flare nozzles 101, 103, and 105 has a plurality of holes 111. The plurality of holes 111 of the coolant flare nozzles 101, 103, and 105 are arranged in a row along the traveling direction TR. The plurality of holes 111 of the coolant flare nozzles 101, 103, and 105 open downward and face the rectangular copper wire 23A.

[0058] The pipe 91A branches into three and is connected to the coolant flare nozzles 101, 103, and 105, respectively. The wiredrawing lubricant 43 flows into the coolant flare nozzles 101, 103, and 105 through the branch pipe 75A and the pipe 91A. Furthermore, the wiredrawing lubricant 43 is sprayed from a plurality of holes 111 in the coolant flare nozzles 101, 103, and 105, and is applied to the surface of the rectangular copper wire 23A.

[0059] The nozzle unit 93B has the same configuration as the nozzle unit 93A. However, the nozzle unit 93B is located below the flat copper wire 23A. In addition, in the nozzle unit 93B, the multiple holes 111 of the coolant flare nozzles 101, 103, and 105 open upward and face the flat copper wire 23A.

[0060] The pipe 91B branches into three and is connected to the coolant flare nozzles 101, 103, and 105 of the nozzle unit 93B, respectively. The wiredrawing lubricant 43 flows through the branch pipe 75B and the pipe 91B into the coolant flare nozzles 101, 103, and 105 of the nozzle unit 93B. Furthermore, the wiredrawing lubricant 43 is sprayed from the multiple holes 111 of the coolant flare nozzles 101, 103, and 105 and applied to the surface of the rectangular copper wire 23A.

[0061] The cooling unit 79 is controlled so that the temperature of the wiredrawing lubricant 43 sprayed from the spray nozzle 35 and the nozzle units 93A and 93B is less than 26°C. The cooling unit 79 may be controlled by a control unit equipped with a computer or by an operator. The higher the temperature of the wiredrawing lubricant, the more strongly the cooling unit 79 cools the wiredrawing lubricant 43.

[0062] The method for measuring the wiredrawing lubricant temperature is the same as in the third embodiment. When the wiredrawing lubricant temperature is less than 26°C, the temperature of the flat copper wire material 23B at the temperature measurement position 51 will be 70°C or less. Therefore, the cooling unit 79 is controlled so that the temperature of the flat copper wire material 23B at the temperature measurement position 51 will be 70°C or less. It is preferable that the temperature of the flat copper wire material 23B at the temperature measurement position 51 be 60°C or less. By lowering the wiredrawing lubricant temperature, the temperature of the flat copper wire material 23B at the temperature measurement position 51 can be made 60°C or less.

[0063] 10, the length in the traveling direction TR of the section where the nozzle units 93A, 93B and the injection nozzle 35 inject the wire drawing lubricant 43 is designated as Z. The unit of Z is m. It is preferable that the following formula (1) is established. Formula (1) Z>0.05XY

[0064] In formula (1), X is the temperature of the wire drawing lubricant. The unit of X is °C. X is, for example, 20°C or less. In formula (1), Y is the drawing speed of the flat copper wire 23A. The unit of Y is m / min. Y is, for example, 30 m / min or less. When formula (1) is satisfied, the effect of cooling the flat copper wire 23A is further enhanced. When formula (1) is satisfied, for example, the temperature of the flat copper wire 23A immediately before the flat wire drawing die 31 can be set to 25°C or less.

[0065] 2. Effects of the manufacturing device 1 and manufacturing method for rectangular enameled copper wire According to the fourth embodiment described above in detail, in addition to the effects of the third embodiment described above, the following effects are also achieved. (4A) The nozzle units 93A and 93B have a plurality of holes 111 arranged in a row along the traveling direction TR. The cooled wire drawing lubricant 43 is sprayed onto the flat copper wire 23A from each of the plurality of holes 111. The sprayed wire drawing lubricant 43 is applied to the surface of the flat copper wire 23A and cools the flat copper wire 23A.

[0066] With these configurations and the spray nozzle 35, any point on the flat copper wire 23A is continuously cooled by the wire drawing lubricant 43 while it travels through the section of length Z. This further enhances the cooling effect on the flat copper wire 23A.

[0067] <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.

[0068] (1) The conductor 23 may be cooled, for example, by an air conditioning system in the building in which the manufacturing apparatus 1 is installed. The lower the temperature in the building, the more the conductor 23 can be cooled. Alternatively, the conductor 23 may be cooled by a cooled liquid. For example, as shown in FIG. 6, a cooled liquid 63 is stored in a tank 61. The flat copper wire 23A is run through the cooled liquid 63. The flat copper wire 23A is cooled as it runs through the cooled liquid 63. Examples of the cooled liquid 63 include water and wire drawing lubricant 43. The temperature of the liquid 63 is preferably less than 26°C, and more preferably 25°C or less.

[0069] (2) In the first embodiment, the rectangular wire drawing machine 11 may include only one of the first cooling section 37 and the second cooling section 39. In the first and second embodiments, some or all of the first cooling section 37, the second cooling section 39, and the third cooling section 53 may be used in combination.

[0070] (3) The manufacturing apparatus 1 may manufacture an enameled copper wire other than a rectangular enameled copper wire, for example, a round enameled copper wire. The cooling unit may cool the round conductor 23 around the round wire drawing machine 5.

[0071] (4) In the third embodiment, the liquid sprayed from the spray nozzle 35 may be a liquid other than the wiredrawing lubricant 43. Examples of liquids other than the wiredrawing lubricant 43 include water, aqueous solutions, and the like. (5) In the third embodiment, the number of injection nozzles 35 may be other than two, and may be, for example, 1, 3, 4, 5, . . .

[0072] (6) In the fourth embodiment, the nozzle units 93A and 93B may each include only one of the coolant flare nozzles 101, 103, and 105. In the fourth embodiment, the coolant flare nozzles 101, 103, and 105 of the nozzle units 93A and 93B may each include a single slit-shaped hole extending along the traveling direction TR, instead of the multiple holes 111. The wiredrawing lubricant 43 is sprayed from the entire slit-shaped hole.

[0073] In the fourth embodiment, the coolant flare nozzles 101, 103, and 105 of the nozzle units 93A and 93B may each have only one hole 111 instead of multiple holes 111. In the fourth embodiment, the nozzle units 93A and 93B may each have two, four, or more coolant flare nozzles.

[0074] In the fourth embodiment, the nozzle units 93A and 93B may each include only one coolant flare nozzle, and the coolant flare nozzle may include one slit-shaped hole extending along the traveling direction TR.

[0075] In the fourth embodiment, the nozzle unit 93B may be located in a position other than below the flat copper wire 23A. For example, the nozzle unit 93B may be located to the side of, diagonally below, or diagonally above the flat copper wire 23A. In the fourth embodiment, the flat wire drawing machine 11 does not have to include one of the nozzle units 93A and 93B.

[0076] (7) In each of the above embodiments, the cooling unit is a component configured to cool the copper wire. Cooling the copper wire means, for example, lowering the temperature of the copper wire compared to when the cooling unit is not present. Cooling the copper wire means, for example, lowering the temperature of the copper wire compared to before the cooling unit acts. The cooling unit cools the copper wire using, for example, a substance having a lower temperature than the copper wire. The cooling unit cools the copper wire by, for example, contacting or bringing the copper wire close to a substance having a lower temperature than the copper wire. The substance that is brought into contact with or close to the copper wire may be, for example, a solid, liquid, or gas. Examples of the liquid include a wire drawing lubricant 43, water, an aqueous solution, etc. Examples of the gas include air, nitrogen, etc. The cooling unit sprays, drips, or applies the cooled liquid or gas onto the copper wire. Examples of methods for spraying, dripping, or applying the cooled liquid or gas include using a nozzle, etc. The cooling unit may be, for example, a copper wire passing through a cooled solid, liquid, or gas. In this case, the cooled solid, liquid, or gas is contained in, for example, a container. The container has a function of cooling the cooled solid, liquid, or gas. In each of the above embodiments, the copper wire is made of copper or a copper alloy, or is a wire containing copper or a copper alloy as a main component. The copper wire has a linear form. (8) 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.

[0077] (9) In addition to the enameled copper wire manufacturing apparatus described above, the present disclosure can also be realized in various forms, such as a system including the manufacturing apparatus as a component, a conductor cooling method, and a conductor cooling apparatus. [Explanation of symbols]

[0078] 1...flat enameled copper wire manufacturing equipment, 3...dance ring or bobbin, 5...round wire drawing machine, 7...flat rolling mill, 9...annealing furnace, 11...flat wire drawing machine, 13...annealing furnace, 15...paint applicator, 17...baking furnace, 19...winder, 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 surface, 31...flat wire drawing die, 31A...inlet side, 31B...exit side end surface, 33...die holder, 35...spray nozzle, 37...first cooling section, 39...second cooling section , 40... cold air, 41... machining hole, 43... wire drawing lubricant, 45... cylindrical portion, 47... vortex cooler, 53... third cooling section, 55... tank, 61... tank, 63... cooled liquid, 71... wire drawing die box, 71A... inlet, 71B... outlet, 71C... discharge hole, 71D... bottom, 73... circulation device, 75... piping, 75A, 75B... branch piping, 77... filter, 79... cooling section, 81... copper powder, 91A, 91B... piping, 93A, 93B... nozzle unit, 101, 103, 105... coolant flare nozzle, 111... hole,

Claims

1. a wire drawing unit configured to produce a drawn copper wire material by continuously performing cold wire drawing on a running copper wire using a wire drawing die; a coating and baking unit configured to coat and bake an enamel paint on a surface of the drawn copper wire material; a cooling unit configured to cool the copper wire so that the temperature of the copper wire at a position that is closer to the end face on the outlet side of the wire drawing die in the running direction of the copper wire and that is 6 cm away from the end face is 70°C or less; Equipped with Enamelled copper wire manufacturing equipment.

2. The enameled copper wire manufacturing apparatus according to claim 1, the cooling unit is an air conditioning unit in a building in which the enameled copper wire manufacturing apparatus is installed, a member configured to cool the copper wire by cold air, or a member configured to cool the copper wire by a cooled liquid. Enamelled copper wire manufacturing equipment.

3. The enameled copper wire manufacturing apparatus according to claim 1, The cooling unit is a member configured to cool the copper wire with a liquid cooled to less than 26°C. Enamelled copper wire manufacturing equipment.

4. The enameled copper wire manufacturing apparatus according to claim 3, The cooling unit is a member configured to apply the liquid to the surface of the copper wire using (a) a nozzle having a plurality of holes arranged along the running direction, (b) a plurality of nozzles arranged along the running direction, or (c) a nozzle having a slit-shaped hole extending along the running direction. Enamelled copper wire manufacturing equipment.

5. The running copper wire is continuously cold drawn using a wire drawing die to produce drawn copper wire material. Applying enamel paint to the surface of the drawn copper wire material and baking it; A method for producing an enameled copper wire, comprising: The copper wire is cooled so that the temperature of the copper wire at a position that is closer to the end face on the outlet side of the wire drawing die in the running direction of the copper wire and that is 6 cm away from the end face is 70°C or less. Manufacturing method of enamelled copper wire.

6. A method for producing an enameled copper wire according to claim 5, cooling the copper wire by an air conditioning device in a building in which the enameled copper wire manufacturing apparatus is installed, a member that cools the copper wire by cold air, or a cooled liquid; Manufacturing method of enamelled copper wire.

7. A method for producing an enameled copper wire according to claim 5, Cooling the copper wire with a liquid cooled to less than 26°C; Manufacturing method of enamelled copper wire.

8. A method for producing an enameled copper wire according to claim 7, The liquid is applied to the surface of the copper wire using (a) a nozzle having a plurality of holes arranged along the running direction, (b) a plurality of nozzles arranged along the running direction, or (c) a nozzle having a slit-shaped hole extending along the running direction. Manufacturing method of enamelled copper wire.

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