JP2016213097A - Manufacturing method and manufacturing installation of enamel wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and manufacturing installation of enamel wire which can prevent lowering of accuracy to size due to elongation of travelling line.SOLUTION: A manufacturing method of enamel wire includes, when a painting step painting enamel wire paint to a conductor 1 and a sticking step sticking the enamel wire paint painted to the conductor 1 are 1 set, a sending out step sending out the conductor 1 to (n)th set around of the painting step by giving tension to a line to the conductor 1 travelling from (n-1)th set around (n is one or more integer chosen from 2-N) of the sticking step to the (n)th set around of the painting step.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and an apparatus for manufacturing an enameled wire.

  2. Description of the Related Art Conventionally, enameled wires have been manufactured through a process of forming a paint layer (insulating layer) by applying a paint such as an insulating paint around a metal wire (running line) such as copper or steel.

  Such a paint layer is formed by, for example, a paint tank in which paint is stored, a die (mold) that is provided on the travel path of the travel line so as to be movable downstream of the paint tank, and a die holder that holds the die. It is performed by the coating material application apparatus provided with. The paint coating apparatus is configured such that after the travel line passes through the paint tank and then passes through the through hole provided in the die, the excess paint applied to the travel line is removed ( For example, see paragraphs [0002] to [0018] of Patent Document 1.

  In recent years, electric vehicles and hybrid vehicles have attracted attention from the viewpoint of environmental protection and economy, and the number of units sold has increased. The driving source of these automobiles is a motor alone or a combination of an engine and a motor, and a very large load is applied to the motor. Therefore, high-power motors tend to be applied as drive motors.

  On the other hand, miniaturization of automobile drive motors is progressing. Miniaturized motors have been put into practical use by not using insulating paper between the phases.

  For these reasons, the enameled wire that constitutes the motor for driving an automobile is required to have a coating that does not break down even when a higher voltage is applied. Since the insulating property of the film tends to be proportional to the thickness of the film, it is necessary to increase the film thickness of the enameled wire. For example, it is required to increase the film thickness more than twice as much as before. .

JP 11-297136 A

  As a method for producing enameled wire, a method is generally used in which conductive metal wires such as copper and aluminum are sent out and paint is applied and baked any number of times. If it is thick, the coating film is not properly dried, foaming occurs, and the insulation and appearance deteriorate.

  Therefore, it is conceivable to take the method of increasing the number of coatings while leaving the coating thickness per one as it is, but it is necessary to squeeze the applied paint each time it is applied and to make it an appropriate coating thickness Therefore, as the number of times of application increases, the force for pulling the running line by the take-up machine increases, and the line extends. Thereby, dimensional accuracy falls and quality will fall.

  Further, since the wire extends, the adhesion between the conductor and the coating resin is lowered, so that when the wire is bent at the time of coil molding, the film is likely to be twisted or cracked. Moreover, since the process by which a wire is extended is added, since an enameled wire becomes hard, the bending process at the time of processing to a coil for motors becomes difficult, and the shape after processing becomes difficult to be maintained.

  On the other hand, even when the number of times of application is not large, when a high-viscosity paint is applied or when the traveling speed is increased, the force for pulling the traveling line by the take-up machine increases, and the line extends. Thereby, dimensional accuracy falls and quality will fall.

  Then, the objective of this invention is providing the manufacturing method and manufacturing apparatus of an enameled wire which can suppress the fall of the dimensional accuracy resulting from elongation of a running line.

  In order to achieve the above object, the present invention provides the following enameled wire manufacturing method and manufacturing apparatus.

[1] Repeating N sets (an integer equal to or greater than N = 2), with one set of an application step of applying an enamel wire paint to a conductor and a baking step of baking the enamel wire paint applied to the conductor. The enameled wire manufacturing method for forming a film on the conductor by the n-1 (one or more integers selected from n = 2 to N) set from the baking process to the nth coating process A method for producing an enameled wire, comprising: a feeding step in which a tensile force is applied in a traveling direction to the conductor that is traveling between and a feeding step of feeding the conductor to an n-th coating step.
[2] The enameled wire according to [1], wherein the N sets are 5 sets or more, and the n is one integer selected from the range of (N / 2) −2 to (N / 2) +2. Manufacturing method.
[3] The N sets are 20 sets or more, and the n is one integer selected from the range of (N / 3) -2 to (N / 3) +2, and (2N / 3) -2 to ( 2N / 3) The method for producing an enameled wire according to [1], which is an integer selected from the range of +2.
[4] The method for manufacturing an enameled wire according to any one of [1] to [3], further including a step of synchronizing a traveling speed of the conductor before and after the feeding step.
[5] A paint application part for applying an enamel wire paint to a conductor, a baking part for baking the enamel wire paint applied to the conductor, and for repeatedly conveying the conductor to the paint application part and the baking part An enameled wire manufacturing apparatus comprising: a turn pulley; and a delivery device with a drive mechanism that applies a tensile force in a traveling direction to the conductor that has passed through the baking portion and feeds the conductor toward the coating material application portion.
[6] The enameled wire manufacturing apparatus according to [5], further including a tuning mechanism that synchronizes the traveling speed of the conductor before and after the transmitter.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method and manufacturing apparatus of an enameled wire which can suppress the fall of the dimensional accuracy resulting from elongation of a running line can be provided.

It is the schematic which shows an example of the manufacturing apparatus (saddle type) of the enamel wire which concerns on embodiment of this invention. It is a top view which shows the principal part of the manufacturing apparatus of FIG. It is the schematic which shows an example of the manufacturing apparatus (horizontal type) of the enameled wire which concerns on embodiment of this invention. It is a top view which shows the principal part of the manufacturing apparatus of FIG.

[Method for producing enameled wire]
An enameled wire manufacturing method according to an embodiment of the present invention includes an application process for applying an enameled wire paint to a conductor and a baking process for baking the enameled wire paint applied to the conductor as one set. (N = 2 or larger integer) A method for producing an enameled wire by repeatedly forming a film on the conductor, wherein n-1 (one or more integers selected from n = 2 to N) set It is provided with a sending process in which a tensile force is applied to the running conductor from after the baking process to before the n-th coating process to send the conductor to the n-th coating process. And Hereinafter, the present embodiment will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing an example of an enameled wire manufacturing apparatus (saddle type) according to an embodiment of the present invention, and FIG. 2 is a top view showing a main part of the manufacturing apparatus of FIG. FIG. 3 is a schematic view showing an example of an enameled wire manufacturing apparatus (horizontal type) according to the embodiment of the present invention, and FIG. 4 is a top view showing a main part of the manufacturing apparatus of FIG.

  In the following description, the vertical manufacturing apparatus of FIGS. 1 and 2 will be mainly described, and the horizontal manufacturing apparatus of FIGS. 3 to 4 will be described with a focus on differences from the vertical manufacturing apparatus.

  The pulley 11, the turn pulley 12, the paint application parts 13 and 23, the baking parts 14 and 24, the take-up machines 16 and 26, and the winder 17 shown in the figure are not particularly limited. A known configuration in the apparatus can be employed.

  In the enameled wire manufacturing method according to the embodiment of the present invention, first, a conductor 1 (running line) drawn from a bobbin, a dancer, or an inline wire drawing machine is placed in an annealing furnace (not shown) via a pulley 11. It is supplied and annealed. Annealing can be omitted if not necessary. Thereafter, as shown in the figure, the conductor 1 is sent to the paint application units 13 and 23 via the turn pulley 12, where the enamel wire paint is applied to the outer periphery of the conductor 1.

  The conductor 1 to which the enamel wire paint is applied is sent to the baking portions 14 and 24, and the solvent in the enamel wire paint evaporates while passing through the baking portions 14 and 24 (that is, the enamel wire paint is dried). The resin is cured (that is, the film is baked). The baking parts 14 and 24 may be constituted by, for example, an integral baking furnace capable of evaporating the solvent and curing the resin, or an evaporating furnace for evaporating the solvent and a curing furnace for curing the resin. (Separate from the evaporation furnace).

  The method for evaporating the solvent in the enamel wire paint and curing the resin in the enamel wire paint is not particularly limited, and can be performed by heating with hot air, a near infrared heater, induction heating or the like.

  As shown in the figure, the enameled wire 2 is returned to the upstream turn pulley 12 via the downstream turn pulley 12 and sent again to the coating material application parts 13 and 23 and the baking parts 14 and 24. The application process for applying the enamel wire paint at the paint application parts 13 and 23 and the baking process for baking the enamel wire paint at the baking parts 14 and 24 are set as one set, and N sets (N = An integer greater than or equal to 2) By being repeated, a film is formed on the conductor 1.

  In the embodiment of the present invention, when N sets are repeatedly performed, after the baking process of the n-1 (one or more integers selected from n = 2 to N) set and before the coating process of the nth set. A feeding process in which a tensile force is applied in the traveling direction to the conductor 1 that is traveling in the traveling direction by the feeders 15 and 25 with a driving mechanism, and the conductor 1 is sent to the n-th coating process. In the embodiment of the present invention, as can be seen from FIG. 2, two transmitters 15 are provided, but one or three or more transmitters may be provided. The same applies to the transmitter 25 in the horizontal manufacturing apparatus of FIGS.

  In the conventional apparatus, since the conductor 1 is pulled and traveled only by the drive mechanism of the take-up machines 16 and 26 before the winder 17, the tension applied to the conductor 1 is cumulative (cumulative) as the number of repetitions increases. As a result, the conductor 1 is stretched and the dimensional accuracy is lowered. However, by adopting the above configuration, the progressively increasing tension is reduced to zero at the positions of the transmitters 15 and 25. Therefore, the elongation of the conductor 1 is suppressed, and the enameled wire 2 with high dimensional accuracy is obtained.

  Examples of the configuration of the transmitters 15 and 25 include capstans 15A and 25A and pressing rolls 15B and 25B shown in the figure, and a driving mechanism for supplying power is connected to the capstans 15A and 25A. The capstans 15A and 25A cooperate with the pressing rolls 15B and 25B to pull the conductor 1 (enameled wire 2) sandwiched between them and send it out in the traveling direction. It is good also as a structure similar to the take-up machine 16 shown by FIG. 1 instead of the said structure. That is, the press roll can be omitted by increasing the contact area and the contact length with the capstan. Moreover, it is good also as a structure similar to the take-up machine 26 shown by FIG. 3, and it can pull and send out by pinching | pinching of two drive rolls.

  Further, in the embodiment of the present invention, it is desirable to provide a step of synchronizing the traveling speed of the conductor 1 before and after the delivery step by a tuning mechanism. Examples of the tuning mechanism include the dancer and dancer pulley disclosed in the above cited reference 1. By adjusting the traveling speed of the conductor 1 by the take-up machines 16 and 26 and the sending machines 15 and 25, the traveling speed of the conductor 1 before and after the sending process can be synchronized without providing a tuning mechanism.

  The turn pulley 12 and the delivery device 15 with the drive mechanism may be integrated, and the turn pulley 12 may also serve as the delivery device 15 with the drive mechanism.

  The installation location of the transmitter is not particularly limited. However, in a vertical manufacturing apparatus, for example, as shown in FIGS. 13 and the seizing part 14) are preferably arranged at positions away from the seizure part 14) so that the conductor 1 turned by the downstream turn pulley 12 is subjected to the feeding process before it is turned by the upstream turn pulley 12. Is preferred. On the other hand, in a horizontal type manufacturing apparatus, for example, as shown in FIGS. 3 to 4, it is installed on the downstream side of the downstream turn pulley 12 (right side in the figure) or upstream of the upstream turn pulley 12 (left side in the figure). It is preferred that It is preferable to provide it on an extension line in the traveling direction so that the traveling direction is not disturbed and the traveling distance is minimized.

  When the above N set (number of repetitions) is 5 sets or more (preferably 10 sets or more), n is an integer selected from the range of (N / 2) -2 to (N / 2) +2 The delivery process is preferably performed at a certain timing, and the delivery machines 15 and 25 are preferably provided at positions where the delivery process can be performed at the timing. More preferably, n is one integer selected from the range of (N / 2) -1 to (N / 2) +1. For example, when the number of repetitions is 10 sets, n = 3 to 7 (more preferably 4 to 6), so the 4th set from the third set baking process to the 4th set application process. From after the baking process until before the 5th set coating process, after the 5th set baking process and before the 6th set coating process, after the 6th set baking process and before the 7th set coating process It is preferable that the delivery process is performed at any time between the first set and the fifth set before the sixth coating process, and after the fifth set baking process and before the sixth set coating process. More preferably, the delivery step is performed at any time between.

  When the above N set (number of repetitions) is 20 sets or more (preferably 30 sets or more), n is an integer selected from the range of (N / 3) −2 to (N / 3) +2. , And (2N / 3) −2 to (2N / 3) +2 is preferably performed at a timing that is one integer selected from the range, and a position where the transmission step can be performed at the timing. It is preferable to provide the transmitters 15 and 25. n is one integer selected from the range of (N / 3) -1 to (N / 3) +1, and one integer selected from the range of (2N / 3) -1 to (2N / 3) +1 More preferably, the delivery step is performed at a certain timing.

  When the aforementioned N set (number of repetitions) is 40 sets or more (preferably 50 sets or more), the above-mentioned n is an integer selected from the range of (N / 4) -2 to (N / 4) +2. , One integer selected from the range of (2N / 4) -2 to (2N / 4) +2, and one integer selected from the range of (3N / 4) -2 to (3N / 4) +2. The delivery process is preferably performed at a certain timing, and the delivery machines 15 and 25 are preferably provided at positions where the delivery process can be performed at the timing. n is one integer selected from the range of (N / 4) -1 to (N / 4) +1, one integer selected from the range of (2N / 4) -1 to (2N / 4) +1, More preferably, the sending process is performed at a timing that is one integer selected from the range of (3N / 4) -1 to (3N / 4) +1.

  When the above-mentioned N sets (repetition number) is less than 5 sets (that is, 2 to 4 sets), it is as follows. In the case of two sets, the delivery process is performed between the first set baking process and before the second set coating process. In the case of three sets, the delivery process is performed either after the first baking process and before the second application process, after the second printing process and before the third coating process. Is done. In the case of 3 sets, after the first set baking process and before the second set application process, after the second set baking process and before the third set application process, the third set baking The delivery process is performed anywhere between the process and before the fourth set application process, but it is preferably performed after the second set baking process and before the third set application process.

  The enameled wire 2 whose film has been baked is pulled by the take-up machine 16, sent to the take-up machine 17, and taken up. As shown in FIG. 1, an apparatus in which the take-up machine 16 and the winder 17 are integrated may be used. As shown in FIG. 3, the take-up machine 26 and the winder 27 are separated. You may use the apparatus of.

  The material of the conductor 1 used in the present embodiment can be used without any particular limitation, such as copper or copper alloy. In addition, examples of the shape of the conductor 1 include a round wire, a rectangular conductor, and the like, but there is an advantage over the conventional method particularly in the case of a rectangular conductor having a high aspect ratio.

  The enamel wire paint used in the present embodiment is not particularly limited as long as it can be used for the enamel wire. Examples of the solvent in the enamel wire paint include N-methyl-2-pyrrolidone (NMP), cresol, N, N-dimethylacetamide (DMAc), cyclohexanone and the like. Examples of the resin in the enamel wire paint include polyamideimide, polyimide, and polyesterimide.

[Enamel wire manufacturing equipment]
The enameled wire manufacturing apparatus according to the embodiment of the present invention includes a coating unit 13 and 23 for applying an enameled wire paint to the conductor 1, and a baking unit 14 and 24 for baking the enameled wire coating applied to the conductor 1. The turn pulley 12 for repeatedly conveying the conductors to the coating parts 13 and 23 and the baking parts 14 and 24, and the conductor 1 passing through the baking parts 14 and 24 by applying a tensile force in the traveling direction. It is provided with the delivery machines 15 and 25 with a drive mechanism sent out in the direction of the coating material application parts 13 and 23. It is preferable to provide a tuning mechanism (not shown) that synchronizes the traveling speed of the conductor 1 before and after the transmitters 15 and 25.

  Specific configuration examples of the enameled wire manufacturing apparatus are as shown in FIGS. 1 to 4 and the details are as described above. The turn pulley 12 and the delivery devices 15 and 25 with a drive mechanism may be integrated as described above.

[Effect of the embodiment of the present invention]
(1) According to the embodiment of the present invention, it is possible to provide an enameled wire manufacturing method and a manufacturing apparatus capable of suppressing a decrease in dimensional accuracy due to the elongation of the travel line. Specifically, by installing an arbitrary number of drive mechanisms with a drive mechanism, the tension applied to the running line can be relaxed and the elongation of the line can be reduced during repeated coating and baking processes. High enameled wire.
(2) According to the embodiment of the present invention, even with an enameled wire that is thicker than ever (for example, the film thickness is 70 μm or more), the dimensional accuracy is high and the adhesion between the conductor and the film resin is high. The enameled wire can be provided in which the decrease is suppressed and the film is not bent or cracked when bent during coil molding. In addition, since the elongation of the running wire is suppressed, the enameled wire is hard to be hard, and when it is processed into a motor coil, it is difficult to bend the enameled wire and it is difficult to maintain the shape after processing. Can be provided. In addition, there is an effect of suppressing a decrease in adhesion between the insulating film and the conductor and adhesion between the insulating films.

  EXAMPLES Next, although an Example demonstrates this invention, this invention is not limited by these Examples.

[Manufacture and evaluation of enameled wire]
An enameled wire was manufactured by the enameled wire manufacturing method and manufacturing device (the vertical manufacturing device of FIG. 1) according to the embodiment of the present invention. The delivery machine 15 was installed in the position about 2 m away from the turn pulley 12, the coating material application part 13, and the baking part 14 as FIGS. A tuning mechanism consisting of a dancer and dancer pulley was installed near the transmitter 15. Table 1 shows the number of repetitions of the coating / baking process and the position of the feeder with the drive mechanism in each example. In Examples 5-6, two delivery machines with a drive mechanism were provided. On the other hand, in Comparative Examples 1 to 5, enameled wires were produced in the same manner as in Examples 2 to 6 except that the delivery device with a drive mechanism was not provided.
Conductor: Flat rectangular conductor made of copper (corner radius of curvature 0.30 mm)
Paint used: N-methyl-2-pyrrolidone (NMP)
Die used: Super steel die Travel speed: 10m / min

  The dimensions of the conductor before the first coating process (conductor dimensions before painting) and the dimensions of the conductor after all coating and baking processes (conductor dimensions after painting) were measured. Moreover, the dimension (finishing dimension) of the manufactured conductor with a film was measured. The measurement results are shown in Table 1.

  Those whose conductor dimensions after painting are within the range of the target conductor dimensions described in Table 1 were determined to be acceptable. In each of the examples, an enameled wire with high conductor dimensional accuracy was obtained.

  In addition, this invention is not limited to the said embodiment and Example, A various deformation | transformation implementation is possible.

DESCRIPTION OF SYMBOLS 1: Conductor, 2: Enamel wire 11: Pulley, 12: Turn pulley 13, 23: Paint application part, 14, 24: Baking part 15, 25: Sending machine 15A, 25A: Capstan, 15B, 25B: Pressing roll 16, 26: take-up machine, 17: winder

Claims (6)

The conductor is obtained by repeatedly performing N sets (an integer equal to or greater than N = 2) with one set of an application step of applying the enamel wire paint to the conductor and a baking step of baking the enamel wire paint applied to the conductor. A method for producing an enameled wire that forms a film on
n-1 (one or more integers selected from n = 2 to N) The tensile force is applied in the direction of travel to the conductor running between the set baking process and before the n set coating process. A method for producing an enameled wire, comprising a feeding step of feeding and feeding the conductor to an n-th coating step.   The method for producing an enameled wire according to claim 1, wherein the N sets are 5 sets or more, and the n is one integer selected from the range of (N / 2) -2 to (N / 2) +2.   The N set is 20 sets or more, the n is one integer selected from the range of (N / 3) -2 to (N / 3) +2, and (2N / 3) -2 to (2N / 3) The method for producing an enameled wire according to claim 1, which is an integer selected from the range of +2).   The manufacturing method of the enameled wire of any one of Claims 1-3 provided with the process of synchronizing the traveling speed of the said conductor before and behind the said sending process.   A paint application portion for applying an enamel wire paint to a conductor; a baking portion for baking the enamel wire paint applied to the conductor; a turn pulley for repeatedly conveying the conductor to the paint application portion and the baking portion; An enameled wire manufacturing apparatus comprising: a feeder with a drive mechanism that applies a tensile force in a traveling direction to the conductor that has passed through the baking portion and feeds the conductor in the direction of the paint application portion.   The enameled wire manufacturing apparatus according to claim 5, further comprising a tuning mechanism that synchronizes the traveling speed of the conductor before and after the transmitter.

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