JP7265432B2 - Insulated wire manufacturing device and insulated wire manufacturing method - Google Patents

Description

The present invention relates to an insulated wire manufacturing apparatus and an insulated wire manufacturing method.

An insulated wire is known in which a linear conductor is coated with an insulating paint (varnish). This insulated wire is manufactured by running a linear conductor in its axial direction and repeatedly applying and baking varnish to the outer peripheral surface of the conductor until the insulating coating reaches a predetermined thickness.

Such an insulated wire manufacturing apparatus includes an application unit that applies varnish to the surface of a running conductor, and a heating unit that heats the varnished conductor to form an insulating layer on the conductor surface. There is known a manufacturing apparatus provided with such an apparatus (see Japanese Patent Application Laid-Open No. 2015-43305).

In the insulated wire manufacturing apparatus, the applied varnish is dried and hardened by heating the conductor, thereby forming an insulating layer on the surface of the conductor. At this time, if the conductor is suddenly heated, the applied varnish tends to foam, and the insulating properties of the formed insulating layer may deteriorate. For this reason, it is common to use a hot air circulating heating furnace that is heated relatively slowly by convection and radiation.

JP 2015-43305 A

In order to improve the production capacity of insulated wires in an insulated wire manufacturing apparatus using a hot air circulating heating furnace, it is necessary to increase the running speed of the conductor. Simply increasing the running speed shortens the time for the conductor to pass through the hot air circulating heating furnace, so the time for the varnish to sufficiently dry and harden is insufficient. In order to make up for this lack of time, a method of extending the furnace length of the hot air circulation heating furnace and a method of raising the furnace temperature can be mentioned.

In the former, it becomes necessary to extend the furnace length of the hot air circulating heating furnace as the running speed increases. In insulated wire manufacturing equipment, hot air circulating heating furnaces account for a large proportion of manufacturing equipment, so the insulated wire manufacturing equipment is large, making it difficult to secure space for the equipment.

In the latter method of raising the furnace temperature, there is a limit to the furnace temperature that can be raised from the viewpoint of the heat resistance of the equipment, and since the running cost is greater than the increase in the furnace temperature, there is a risk that the manufacturing cost will increase.

The present invention has been made based on the circumstances as described above, and an insulated wire in which foaming of varnish is unlikely to occur during manufacturing, and manufacturing capacity is improved while suppressing an increase in the size of manufacturing equipment and manufacturing costs. The purpose is to provide a manufacturing apparatus and a method for manufacturing an insulated wire.

An apparatus for manufacturing an insulated wire according to an aspect of the present invention includes a coating and drying section that coats and dries a varnish while allowing a linear conductor to run in its axial direction, and a downstream side of the coating and drying section in the running direction of the conductor. and a curing section for curing the varnish, the coating and drying section having a coating device for coating the varnish on the conductor and a heating furnace for heating the conductor after the varnish coating, A curing section has an induction heater for heating the conductor.

INDUSTRIAL APPLICABILITY According to the insulated wire manufacturing apparatus and the insulated wire manufacturing method of the present invention, the varnish is less likely to foam during manufacturing, and the manufacturing capacity can be improved while suppressing the enlargement of the manufacturing equipment and the increase in the manufacturing cost.

FIG. 1 is a schematic configuration diagram of an insulated wire manufacturing apparatus according to one embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of a coating/drying section and a curing section of the insulated wire manufacturing apparatus of FIG. FIG. 3 is a schematic diagram showing the detailed configuration of the coating apparatus of FIG. FIG. 4 is a schematic diagram showing the detailed configuration of the curing section in FIG. FIG. 5 is a flowchart showing a method for manufacturing an insulated wire according to one embodiment of the present invention.

[Description of the embodiment of the present invention]
An apparatus for manufacturing an insulated wire according to an aspect of the present invention includes a coating and drying section that coats and dries a varnish while allowing a linear conductor to run in its axial direction, and a downstream side of the coating and drying section in the running direction of the conductor. and a curing section for curing the varnish, the coating and drying section having a coating device for coating the varnish on the conductor and a heating furnace for heating the conductor after the varnish coating, A curing section has an induction heater for heating the conductor.

In the apparatus for manufacturing an insulated wire, after the varnish is applied to the conductor, the varnish is gently dried in the heating furnace having a long furnace length in the coating/drying section, so that the varnish hardly foams. In addition, since the equipment cost per unit length of the heating furnace is small, it is possible to suppress an increase in manufacturing costs even if the furnace length is long. On the other hand, in the insulated wire manufacturing apparatus, the dried varnish is cured by an induction heater in the curing section. Since the induction heater can easily raise the temperature of the conductor substantially in proportion to the power supplied, the varnish can be cured in a shorter furnace length than the heating furnace. Therefore, even if the running speed of the conductor is increased to improve the manufacturing capacity, it is possible to suppress the increase in the size of the manufacturing equipment and the manufacturing cost. Furthermore, even if the dried varnish is rapidly heated, foaming of the varnish is unlikely to occur. Therefore, in the insulated wire manufacturing apparatus, the varnish is less likely to foam, and manufacturing capacity can be improved while suppressing an increase in the size of manufacturing equipment and an increase in manufacturing costs.

It is preferable that the induction heater has a plurality of heating regions along the traveling direction of the conductor, the heating temperature of the conductor being independently controllable. In this way, the induction heater has a plurality of heating regions along the running direction of the conductor in which the heating temperature of the conductor can be independently controlled, thereby facilitating the temperature control of the conductor. Therefore, the conductor can be quickly heated to a desired temperature and then maintained at that temperature. Such temperature control can further improve the production capacity.

It is preferable that the conductor is configured to repeatedly pass through the coating/drying section and the curing section in this order. If an amount of varnish corresponding to the thickness of the insulating layer required for the conductor is applied at one time, it takes time to dry the varnish and foams easily. By forming an insulating layer on the conductor while repeating application, drying and curing in this way, it is possible to efficiently form the insulating layer while suppressing foaming of the varnish.

It is preferable that the conductor in the coating and drying section is configured to repeatedly pass through the coating device and the heating furnace in this order. In this way, after repeating the application to the conductor and the drying in the coating/drying section for a certain number of times, the curing is performed in the curing section, so that the equipment required for curing can be reduced. Therefore, equipment costs and installation space can be reduced, and running costs can be reduced.

A method for manufacturing an insulated wire according to another aspect of the present invention includes the steps of applying varnish while running a linear conductor in its axial direction, and drying the varnish applied to the conductor in a heating furnace. and curing the varnish with an induction heater after the drying step.

In the method for manufacturing an insulated wire, the conductor is gently dried in a long heating furnace after the varnish is applied, so that the varnish is less likely to foam. In addition, since the equipment cost per unit length of the heating furnace is small, it is possible to suppress an increase in manufacturing costs even if the furnace length is long. On the other hand, in the manufacturing method of the insulated wire, the dried varnish is cured by an induction heater. Since the induction heater can easily raise the temperature of the conductor substantially in proportion to the power supplied, the varnish can be cured in a shorter furnace length than the heating furnace. Therefore, even if the running speed of the conductor is increased to improve the manufacturing capacity, it is possible to suppress the increase in the size of the manufacturing equipment and the manufacturing cost. Furthermore, even if the dried varnish is rapidly heated, foaming of the varnish is unlikely to occur. Therefore, by using the method for manufacturing an insulated wire, it is possible to improve the manufacturing capacity while preventing the varnish from foaming and suppressing the increase in the size of the manufacturing equipment and the manufacturing cost.

In this specification, the term "heating furnace" refers to a furnace that heats an object by transferring heat generated by electric heating or combustion to an object to be heated.

[Details of the embodiment of the present invention]
EMBODIMENT OF THE INVENTION Hereinafter, it explains in full detail, referring drawings for embodiment of the manufacturing apparatus of the insulated wire and the manufacturing method of the insulated wire which concern on this invention.

[Insulated wire manufacturing equipment]
The insulated wire manufacturing apparatus shown in FIG. A coating and drying section 2 that applies and dries the varnish while running in its axial direction, a curing section 3 that is installed on the downstream side of the running direction of the conductor W of the coating and drying section 2 and cures the varnish, and a wound It is provided with a delivery section 4 that delivers the conductor W to the first drum 1a, and a winding section 5 that winds up the conductor W formed with an insulating layer, that is, the insulated wire.

<Conductor>
Although the material and configuration of the conductor W are not particularly limited, for example, copper wire, tin-plated copper wire, aluminum wire, aluminum alloy wire, steel core aluminum wire, copper fly wire, nickel-plated copper wire, silver-plated A copper wire, a copper-coated aluminum wire, or the like can be used. Moreover, the cross-sectional shape of the conductor W is not particularly limited, and may be a circular shape (round wire), an elliptical shape, a polygonal shape such as a square shape (rectangular wire), or the like.

<Sending part>
The delivery unit 4 delivers the conductor W wound on the reel to the first drum 1a. The reel of the delivery unit 4 may be of a driven type or may be of a non-driven type. When the reel of the delivery section 4 is driven, it is preferable to control the drive of the delivery section 4 so that excessive slack or tension does not occur in the conductor W between the first drum 1a. A well-known motor such as a servomotor and a stepping motor can be used to drive the delivery unit 4 .

<Drum>
The first drum 1a and the second drum 1b are arranged to face each other in the vertical direction with the coating drying section 2 and the curing section 3 interposed therebetween. A drum 1b is arranged. The first drum 1a and the second drum 1b allow the conductor W to go around. The first drum 1a and the second drum 1b extend in a direction perpendicular to the paper surface of FIG. 1, and the positions at which the conductors W are hooked are shifted in the axial direction of the drum 1 toward the back side of the paper surface by a constant interval for each turn. , the conductor W can be circulated. The conductor W on which an insulating layer is formed on the surface by winding between the drums 1 a certain number of times, ie, the insulated wire, is finally wound by the winding section 5 provided on the downstream side of the conductor W in the running direction. As the material of the drum 1, metal, resin, or the like can be used. The first drum 1a is a drive drum, and is driven to rotate by a drive section (not shown). The second drum 1b is rotatably supported and rotates as the conductor W travels.

<Coating and drying part>
As shown in FIG. 2, the coating/drying section 2 includes a coating device 21 for coating the conductor W with varnish, and a heating furnace 22 for heating the conductor W after the varnish coating.

As described above, the conductor W circulates between the drums 1 a certain number of times and passes through the coating device 21 and the heating furnace 22 in this order each time it circulates. In addition, in the coating/drying section 2 shown in FIG. 2, the insulated wire is manufactured such that the conductor W passes through the coating device 21 and the heating furnace 22 in the coating/drying section 2 three times in succession, and then passes through the curing section 3. Device is configured. In other words, the insulated wire manufacturing apparatus is configured such that the conductor W in the coating/drying section 2 passes through the coating device 21 and the heating furnace 22 in this order three times. In this manner, the application and drying to the conductor W are repeated a certain number of times in the coating/drying section 2, and then the curing is performed in the curing section 3, thereby shortening the time required for curing. As a result, it is possible to improve the production capacity of the insulated wire while suppressing the insulating property of the insulating layer.

In FIG. 2, the coating and drying section 2 is configured so that the conductor W passes through a different coating device 21 for each turn. It is also possible to adopt a configuration in which one coating device 21 is passed through each time. Further, a configuration may be adopted in which a plurality of coating devices 21 are provided in a number smaller than the number of turns of the conductor W, and the conductor W passes through each coating device 21 once or multiple times.

Conversely, in FIG. 2, the coating and drying section 2 is configured so that the conductor W passes through the same heating furnace 22 for each turn. It can also be configured to pass through a different heating furnace 22 every time. Further, a configuration may be adopted in which a plurality of heating furnaces 22 are provided in a number smaller than the number of turns of the conductor W, and the conductor W passes through one heating furnace 22 once or multiple times.

(Coating device)
As shown in FIG. 3, the coating device 21 includes a varnish tank 21a that stores varnish, and a coating die that is provided on the downstream side of the varnish tank 21a in the running direction of the conductor W and through which the conductor W that has passed through the varnish tank 21a is inserted. 21b. The coating device 21 applies varnish to the outer peripheral surface of the conductor W that encircles the first drum 1a and the second drum 1b.

The bottom of the varnish tank 21a is provided with a through hole through which the conductor W penetrates, and the varnish of the varnish tank 21a is applied to the outer peripheral surface of the conductor W passing through the through hole. In addition, when the number of passages of the conductor W to one coating device 21 is plural, the through-holes are arranged at desired intervals by the number of passages so that the conductor W can easily go around.

The varnish applied to the outer peripheral surface of the conductor W is adjusted to a substantially uniform thickness according to the diameter of the die hole by inserting the conductor W through the coating die 21b. This coating die 21b is provided for each round of the conductor W regardless of the number of times the conductor W passes through one coating device 21. FIG. That is, the same number of coating dies 21b as the conductor W passes through is provided. The diameter of the die hole of the coating die 21b is made larger for the coating die 21b positioned further downstream in the running direction of the conductor W. As shown in FIG. By gradually increasing the diameter of the coating die 21b in this manner, the coating formed on the outer peripheral surface of the conductor W can be gradually thickened, and an insulating layer having a constant thickness can be formed.

Therefore, the number of coating dies 21b is determined from the thickness of the insulating layer formed per time and the total thickness of the necessary insulating layers. The number of turns of the conductor W can be the same as the number of coating dies 21b.

As the varnish, one obtained by dissolving the resin constituting the insulating layer with a solvent is used. The constituent resin is not particularly limited as long as it has high insulating properties and high heat resistance. Specific examples include polyimide, polyamideimide, and polyesterimide. Moreover, pyrrolidone, cresol, etc. can be used as a solvent.

(heating furnace)
The heating furnace 22 heats the conductor W after the varnish is applied to evaporate the solvent and dry the varnish.

The heating furnace 22 is not particularly limited, but one that heats the conductor W by convection and radiation using electric heat or heat generated by combustion as an energy source can be used. A heater can be used as the electric heat. In addition, the combustion includes taking in and burning the solvent that evaporates from the varnish together with the fuel. Since the heating furnace 22 heats the conductor W relatively gently by convection and radiation, the varnish is less likely to foam during heating.

As the heating furnace 22, a hot air circulating heating furnace that heats the conductor W with circulating hot air is preferable. By heating the conductor W with hot air, the temperature distribution of the outer peripheral surface of the conductor W can be easily made uniform, so that the manufactured insulated wire can be made uniform.

The temperature at which the conductor W passing through the heating furnace 22 is heated (atmospheric temperature in the heating furnace 22) is a temperature at which the solvent can be evaporated from the varnish. Specifically, the lower limit of the atmospheric temperature in the heating furnace 22 is preferably 150°C, more preferably 200°C. On the other hand, the upper limit of the ambient temperature is preferably 600°C, more preferably 500°C. If the ambient temperature is less than the lower limit, the solvent may not evaporate sufficiently, or the length of the heating furnace 22 may become unnecessarily large. Conversely, if the ambient temperature exceeds the upper limit, the heat resistance of the heating furnace 22 may be insufficient and the conductor W may be thermally damaged.

The furnace length of the heating furnace 22 is a length that allows the solvent to sufficiently evaporate from the varnish, and is appropriately determined depending on the running speed of the conductor W and the atmospheric temperature in the heating furnace 22 .

Since the conductor W is gently heated in the heating furnace 22 as described above, the varnish is less likely to foam during heating. Since the conductor W is gently heated, the furnace length required for heating is inevitably long. Since the equipment cost per unit length of the heating furnace 22 is smaller than that of, for example, an induction heater 31, which will be described later, an increase in equipment cost can be suppressed even with such a long furnace length. Therefore, the manufacturing apparatus for the insulated wire is provided with the heating furnace 22, thereby suppressing an increase in manufacturing costs.

<Hardened part>
The curing section 3 has an induction heater 31 for heating the conductor W, as shown in FIG. The curing section 3 cures the resin contained in the varnish after the solvent has been evaporated in the coating and drying section 2 to form an insulating coating on the outer periphery of the conductor W. FIG.

In the curing section 3 shown in FIG. 2, the insulated wire manufacturing apparatus is configured such that the conductor W passes through the curing section 3 after successively passing through the coating device 21 and the heating furnace 22 in the coating drying section 2 three times. It is The insulated wire manufacturing apparatus is configured such that the conductor W that has passed through the curing section 3 passes through the coating drying section 2 again and then passes through the curing section 3 . That is, the insulated wire manufacturing apparatus is configured such that the conductor W repeatedly passes through the coating/drying section 2 and the curing section 3 in this order. By forming the insulating layer on the conductor W while repeating the application, drying and curing in this manner, the equipment required for curing can be reduced. Therefore, equipment costs and installation space can be reduced, and running costs can be reduced.

The induction heater 31 directly heats the conductor W using an electromagnetic induction current generated in the conductor W by a change in magnetic field (AC magnetic field). The frequency of the induction heater 31 (the frequency of the current for generating the AC magnetic field) is appropriately determined from the viewpoint of heating efficiency and equipment cost, and can be, for example, 10 kHz or more and 10 MHz or less.

In induction heating, the magnetic field is strengthened in proportion to the magnitude of the current flowing through the coil to generate a magnetic field, and the current induced in the conductor W is also increased in proportion to the strength of the magnetic field. Since the amount of heat generated by the conductor W is proportional to the square of this induced current, the induction heater 31 can heat the conductor W in proportion to the square of the current flowing through the coil for generating the magnetic field. Therefore, by increasing the current so as to generate heat in proportion to the necessary running speed, the conductor W can be heated without increasing the distance that the conductor W passes through the induction heater 31 (the heating distance of the induction heater 31). The necessary heating is possible. Therefore, the heating distance can be, for example, 1/10 or more and 1/2 or less of the length of the heating furnace. Moreover, since it is a direct heating method, it is difficult for the heating temperature to be restricted due to the heat resistance of the equipment.

As shown in FIG. 4, the induction heater 31 has three heating regions (first heating region 31a, second heating region 31b, and third heating region 31c) capable of independently controlling the heating temperature of the conductor W. It has along the direction of travel of W. The conductor W inserted into the induction heater 31 is quickly heated to a desired temperature (a temperature suitable for curing the resin contained in the varnish), and passes through the induction heater 31 while maintaining the temperature constant. preferably. Specifically, for example, rapid heating is performed by generating a large induced current in the conductor W in the first heating region 31a, and the heating amount is adjusted so that the temperature of the conductor W approaches the desired temperature in the second heating region 31b, It is preferable to control so that the temperature of the conductor W is kept constant in the third heating region 31c. In this case, since the magnitude of the current to be induced in the conductor W differs in each region, the heating temperature of the conductor W can be independently controlled in the first heating region 31a, the second heating region 31b, and the third heating region 31c. there has to be In other words, the induction heater 31 has a plurality of heating regions along the running direction of the conductor W, in which the heating temperature of the conductor W can be independently controlled, so that the temperature of the conductor W can be easily controlled. Therefore, the conductor W can be quickly heated to a desired temperature and then maintained at that temperature. Such temperature control can further improve the production capacity. The desired temperature is a temperature at which the resin contained in the varnish can be cured, and is, for example, 150° C. or higher and 600° C. or lower.

The first heating region 31a, the second heating region 31b, and the third heating region 31c may be configured by dividing one induction heater 31 into three regions. It can also be configured.

Also, the heating distances of the first heating region 31a, the second heating region 31b, and the third heating region 31c are appropriately determined according to the required temperature control. For this reason, the heating distances of the first heating region 31a, the second heating region 31b, and the third heating region 31c may be equal or may be different.

There may be gaps between the first heating area 31a and the second heating area 31b and between the second heating area 31b and the third heating area 31c.

Although the induction heater 31 has three heating regions in FIG. 4, the number of heating regions is not limited to three, and may be two or four or more. Moreover, the induction heater 31 may not have a plurality of heating regions capable of independently controlling the heating temperature of the conductor W, that is, may be capable of controlling only one temperature as a whole.

The heating distance of the induction heater 31 (total heating distance of each of the first heating region 31a, the second heating region 31b, and the third heating region 31c) is a length that can sufficiently cure the resin contained in the varnish. It is appropriately determined depending on the temperature profile of the conductor W heated by the vessel 31 and the running speed of the conductor W. Since the vicinity of the inlet and outlet of the induction heater 31 hardly contributes to the heating of the conductor W, the length of the heating region of each induction heater 31 is preferably 100 mm or more from the viewpoint of heating efficiency.

Specifically, the ratio between the furnace length of the heating furnace 22 and the heating distance of the induction heater 31 can be 6:1 or more and 10:1 or less. As described above, in the insulated wire manufacturing apparatus, the heating distance of the induction heater 31 can be made shorter than the furnace length of the heating furnace 22 . For this reason, the furnace length of the heating furnace 22 can be increased compared to the case where only the heating furnace is used for the same insulated wire manufacturing apparatus space. Therefore, even if the running speed of the conductor W is increased, the varnish applied to the conductor W can be reliably dried and cured.

<Winding part>
The winding section 5 pulls the conductor W and winds it onto a reel. The tensile force of the winding section 5 causes the conductor W to go around between the coating/drying section 2 and the curing section 3 . A known motor such as a servomotor or a stepping motor can be used to drive the winding unit 5 .

[Manufacturing method of insulated wire]
Next, a method for manufacturing the insulated wire will be described. The method for manufacturing the insulated wire includes, as shown in FIG. 5, a coating step S1, a drying step S2, and a curing step S3. The insulated wire manufacturing method can be performed using the insulated wire manufacturing apparatus shown in FIG.

<Process of applying>
In the coating step S1, the varnish is applied while running the linear conductor W in its axial direction. Specifically, the conductor W is delivered from the delivery section 4, passed through the first drum 1a, and the coating device 21 is caused to run.

The conductor W is inserted from the through hole in the bottom of the varnish tank 21a, passes through the varnish stored in the varnish tank 21a, and is coated with insulating varnish on its outer peripheral surface. The varnish applied to the outer peripheral surface of the conductor W is adjusted to a substantially uniform thickness according to the diameter of the die hole by inserting the conductor W into the coating die 21b.

<Drying process>
In the drying step S<b>2 , the varnish applied to the conductor W is dried by the heating furnace 22 . Specifically, the conductor W that has passed through the coating die 21b is caused to travel through the heating furnace 22 .

As a result, the varnish applied to the conductor W evaporates the solvent when passing through the heating furnace 22, and the varnish dries.

The applying step S1 and the drying step S2 may be repeated in this order multiple times before performing the curing step S3.

<Curing process>
In the curing step S3, the induction heater 31 cures the varnish after the drying step S2. Specifically, the conductor W that has passed through the heating furnace 22 is caused to travel through the induction heater 31 .

As a result, the resin contained in the varnish after the solvent evaporates in the drying step S2 hardens, and an insulating coating is formed on the outer periphery of the conductor W. As shown in FIG.

The applying step S1, the drying step S2, and the curing step S3 may be repeated in this order.

Through the above steps, an insulating layer is formed on the outer periphery of the conductor W, and an insulated wire can be manufactured.

〔advantage〕
In the apparatus for manufacturing an insulated wire and the method for manufacturing an insulated wire, after the varnish is applied to the conductor W, the varnish is gently dried in the heating furnace 22 having a long furnace length, so that the varnish hardly foams. In addition, since the heating furnace 22 has a low equipment cost per unit length, it is possible to suppress an increase in manufacturing costs even with a long furnace length. In the insulated wire manufacturing apparatus and the insulated wire manufacturing method, the dried varnish is cured by the induction heater 31 . Since the induction heater 31 can easily raise the temperature of the conductor W substantially in proportion to the power supplied, the varnish can be cured with a shorter furnace length than the heating furnace. Therefore, even if the traveling speed of the conductor W is increased to improve the manufacturing capacity, it is possible to suppress the increase in the size of the manufacturing equipment and the manufacturing cost. Furthermore, even if the dried varnish is rapidly heated, foaming of the varnish is unlikely to occur. Therefore, by using the apparatus for manufacturing an insulated wire and the method for manufacturing an insulated wire, it is possible to improve the manufacturing capacity while preventing the varnish from foaming and suppressing the enlargement of the manufacturing equipment and the increase in the manufacturing cost.

[Other embodiments]
It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is not limited to the configuration of the above-described embodiment, but is indicated by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims. be.

In the above embodiment, the case where the conductor repeatedly passes through the coating device and the heating furnace in this order three times in the coating and drying section has been described, but the number of repetitions is not limited to three times, and may be two times or four times or more. good too. The number of repetitions is preferably two or more and five or less from the viewpoint of shortening the curing time and suppressing deterioration of the insulating properties of the insulating layer.

Further, in the above embodiment, the number of repetitions is fixed at 3, and the number of repetitions is the same when the conductor passes through the curing section and then circulates and then passes through the coating and drying section. may be different for each revolution through the hardening section.

Furthermore, the number of repetitions is 1, that is, the conductor does not repeatedly pass through the coating device and the heating furnace in the coating and drying section, and the configuration in which the conductor passes through the curing section each time it passes through the coating device and the heating furnace is also the intention of the present invention. I'm about to.

In the above embodiment, the case where the conductor repeatedly passes through the coating/drying section and the curing section in this order has been described. Configurations in which only one is provided are also contemplated by the present invention.

As described above, the apparatus for manufacturing an insulated wire and the method for manufacturing an insulated wire according to the present invention can prevent the varnish from foaming during manufacturing, and can improve the manufacturing capacity while suppressing the increase in the size of the manufacturing equipment and the manufacturing cost. .

1 Drum 1a First Drum 1b Second Drum 2 Coating Drying Section 21 Coating Device 21a Varnish Tank 21b Coating Die 22 Heating Furnace 3 Curing Section 31 Induction Heater 31a First Heating Region 31b Second Heating Region 31c Third Heating Region 4 Delivery Part 5 Winding part W Conductor

Claims (4)

a coating and drying section that coats and dries the varnish while running the linear conductor in its axial direction;
a curing section that is installed downstream of the coating and drying section in the running direction of the conductor and cures the varnish,
The coating and drying unit has a coating device for coating the varnish on the conductor and a heating furnace for heating the conductor after the varnish coating,
The curing unit has an induction heater that heats the conductor,
The heating furnace is a hot air circulation heating furnace,
An apparatus for manufacturing an insulated wire , wherein the conductor is configured to repeatedly pass through the coating/drying section and the curing section in this order . 2. The apparatus for manufacturing an insulated wire according to claim 1, wherein the induction heater has a plurality of heating regions along the traveling direction of the conductor, the heating temperature of the conductor being independently controllable. 3. The apparatus for manufacturing an insulated wire according to claim 1, wherein the conductor is configured to repeatedly pass through the coating device and the heating furnace in this order in the coating and drying section. A step of applying varnish while running a linear conductor in its axial direction;
a step of drying the varnish applied to the conductor in a heating furnace;
A step of curing the varnish after the drying step with an induction heater,
The heating furnace is a hot air circulation heating furnace,
A method for manufacturing an insulated wire , wherein the applying step, the drying step, and the curing step are repeated in this order .

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