JP2013232380A - Die, apparatus for manufacturing insulated wire, and method for manufacturing insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die, an apparatus for manufacturing an insulated wire, and a method for manufacturing an insulated wire which are capable of reducing variation in thickness of an insulating coating applied to a conductor.SOLUTION: A die 10 comprises a body part 1 and a lubricated part 2. The body part 1 has one end face 3 and the other end face 4 facing each other and has a through hole 5 penetrating between the one end face 3 and the other end face 4. The lubricated part 2 is disposed on the one end face 3 of the body part 1. The friction coefficient of the lubricated part 2 is smaller than that of the one end face 3 of the body part 1.

Description

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

  Conventionally, an enameled wire in which an insulating coating is coated on a conductor is known. Enameled wires are widely used, for example, as wiring for various electric devices and windings for motors and transformers.

  Conventionally, enameled wire with an insulating film formed on a conductor having a substantially circular cross section has been used, but from the viewpoint of high space factor and miniaturization of various electric devices, the cross section is substantially A rectangular conductor (hereinafter also referred to as a “flat rectangular conductor”) and an insulated wire in which an insulating coating is formed on the rectangular conductor are widely used.

  As a technique for forming an insulating paint on a flat conductor, after applying the insulating paint to the flat conductor at the application part, the insulating material is applied to the flat conductor by passing the flat conductor through the substantially rectangular opening formed in the die. A method for adjusting the thickness of the paint is described in Japanese Patent Application Laid-Open No. 2008-123759 (Patent Document 1). The opening of the die is substantially similar to the cross section of the flat conductor. Therefore, when the flat conductor passes through the die, excess insulating paint is removed, and the insulating paint formed on the outer periphery of the flat conductor is adjusted to a uniform thickness.

JP 2008-123759 A

  The thickness of the insulating paint is determined by the gap between the die and the conductor. Therefore, in order to obtain an insulating paint having a uniform thickness, it is necessary to transport the conductor while maintaining a good positional relationship between the die and the conductor. In the case of a flat rectangular conductor, when the conductor is twisted, the thickness of the insulating coating 24 applied to the conductor 11 becomes nonuniform as shown in FIG. Even in the case of a conductor having a substantially circular cross section, the thickness of the insulating coating applied to the conductor becomes non-uniform because the center portion of the die is displaced from the center portion of the conductor (in other words, the conductor is eccentric). Variations in film thickness may occur.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a die, an insulated wire manufacturing apparatus, and an insulated wire that can reduce variations in the thickness of an insulating coating applied to a conductor. It is to provide a manufacturing method.

  The die according to the present invention has a main body portion and a lubricating portion. The main body portion has one end surface and the other end surface facing each other, and has a through-hole penetrating between the one end surface and the other end surface. The lubrication part is arrange | positioned on the one end surface of the main-body part. The friction coefficient of the lubrication part is smaller than the friction coefficient of the one end face of the main body part.

  The insulated wire manufacturing apparatus according to the present invention includes a coating part, a die, a stopper, and a lubricating part. The application part is for applying an insulating paint to the conductor. The dice is for adjusting the thickness of the insulating paint applied to the conductor by the application part. The stopper is for restricting the movement of the die in the direction of movement of the conductor. The die includes a main body portion having one end surface and the other end surface facing each other and having a through hole penetrating between the one end surface and the other end surface. The stopper includes a stop surface facing one end surface of the die. The lubricating portion is disposed on at least one of the one end surface and the stop surface. The friction coefficient of the lubrication part is smaller than the friction coefficient of the surface where the lubrication part is provided.

  The manufacturing method of the insulated wire which concerns on this invention has the following processes. Insulating paint is applied to the conductor. After the applying step, the conductor is passed through the through hole of the die in order to adjust the thickness of the insulating coating applied to the conductor. The die is restricted from moving in the direction of movement of the conductor by a stopper. The die includes a main body portion having one end surface and the other end surface facing each other and having a through hole penetrating between the one end surface and the other end surface. The stopper includes a stop surface facing one end surface of the die. A lubricating portion is provided on at least one of the one end face and the stop face. The friction coefficient of the lubrication part is smaller than the friction coefficient of the surface where the lubrication part is provided.

  According to the die of the present invention, the lubrication part is disposed on one end face of the main body part, and the friction coefficient of the lubrication part is smaller than the friction coefficient of the one end face of the main body part. Further, according to the insulated wire manufacturing apparatus and the insulated wire manufacturing method according to the present invention, the lubrication portion is disposed on at least one of the one end surface and the stop surface, and the friction coefficient of the lubrication portion is provided with the lubrication portion. It is smaller than the friction coefficient of the surface. Thereby, compared with the case where it does not have a lubrication part, a die | dye can move easily with respect to a stopper. Therefore, even when the conductor is twisted or eccentric, the die can move following the twist or eccentricity of the conductor. As a result, variation in the thickness of the insulating coating applied to the conductor can be reduced.

  Preferably, in the above-mentioned die, the lubricating part includes at least one of PTFE, DLC, and lubricating oil. Thereby, a lubrication part can be formed easily.

  Preferably, in the above-mentioned die, the lubricating portions are arranged concentrically around a virtual axis along the through hole. Thereby, it can reduce that the thickness of the insulation coating apply | coated to a conductor varies by suppressing that the one end surface of die | dye inclines with respect to the stop surface of a stopper.

  As described above, according to the present invention, variations in the thickness of the insulating paint applied to the conductor can be reduced.

It is a schematic diagram which shows roughly the structure of the manufacturing apparatus of the insulated wire in one embodiment of this invention. It is a perspective view which shows roughly the structure of the dice | dies in one embodiment of this invention. It is a side view which shows roughly the structure of the dice | dies and stopper in one embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the lubrication part in the die | dye of one embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the lubrication part in the die | dye of one embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the lubrication part in the die | dye of one embodiment of this invention. It is a side view which shows roughly the structure of the dice | dies and stopper in one embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the lubrication part in the stopper of one embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the lubrication part in the stopper of one embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the lubrication part in the stopper of one embodiment of this invention. It is a figure which shows the dice | dies and stopper of a prior art example. It is a figure which shows the state by which the insulating coating material was apply | coated to the conductor with the dice | dies of the prior art example. It is a figure which shows the dice | dies and stopper of the example of this invention. It is a figure which shows the state by which the insulating coating material was apply | coated to the conductor with the dice | dies of the example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. The present invention is not limited to this form.

  Referring to FIG. 1, an insulated wire manufacturing apparatus 100 of the present embodiment is for manufacturing an insulated wire by applying an insulating paint to a conductor 11. It mainly includes a stopper 15, a plurality of drying heating devices 16, a plurality of curing heating devices 17, a transport unit 13, and a plurality of dies 10.

  In the present embodiment, the cross-sectional shape of the conductor 11 is circular, but the cross-sectional shape is not limited to a circular shape, and may be, for example, a quadrangle. The conductor 11 having a square cross-sectional shape may be any shape having two sets of opposite sides in the cross-section, and includes a case where the corners are rounded. Specific examples of the conductor 11 having a quadrangular cross section include a rectangle and a square. The cross-sectional shape of the conductor 11 may be a polygon such as an ellipse or a hexagon.

  Each of the plurality of application parts 12 is filled with an insulating paint such as a polyamide-imide resin varnish or a polyimide resin varnish, and the conductor 11 passes through the application part 12 so that the outer peripheral surface of the conductor 11 has an insulating paint. It is comprised so that can be apply | coated.

  Each of the plurality of dies 10 has a main body portion 1 and a lubricating portion 2. When the conductor 11 passes through the opening 6 of the through hole 5 provided in the main body 1, the thickness of the insulating coating applied to the outer peripheral surface of the conductor 11 can be controlled to a constant thickness. Details of the configuration of the die 10 will be described later.

  The plurality of drying heating devices 16 are for heating the conductor 11 and the insulating paint in order to mainly dry the insulating paint applied on the conductor 11. Here, the drying of the insulating paint means heating to a temperature at which the solvent contained in the insulating paint is vaporized and the insulating paint is not cured. Each of the drying heating devices 16 may be an induction heating coil. The curing heating device 17 is for heating the conductor 11 and the insulating paint in order to mainly cure the insulating paint on the conductor 11. Here, curing the insulating paint means heating to a temperature higher than the temperature at which the insulating paint is cured. The curing heating device 17 may be an induction heating coil.

  Insulating paint is applied to the conductor 11 by the applying unit 12, the thickness of the insulating paint is controlled by the die 10, the insulating paint is dried by the drying heating device 16, and the insulating paint is cured by the curing heating device 17. A series of operations are performed. When the coating unit 12, the die 10, the stopper 15, the drying heating device 16, and the curing heating device 17 are a set of coating units, the insulated wire manufacturing apparatus 100 according to the present embodiment includes a plurality of insulated wire manufacturing apparatuses 100. It has a set of application units. Thereby, the insulating paint can be applied to the conductor 11 a plurality of times.

  The transport unit 13 is for transporting the conductor 11 from the upstream side to the downstream side. The transport unit 13 allows the conductor 11 to pass through the coating unit 12, the curing heating device 17, and the like.

  With reference to FIGS. 2-10, the structure of the dice | dies 10 and the stopper 15 of this Embodiment is demonstrated.

  As shown in FIG. 2, the die 10 has a main body portion 1 and a lubricating portion 2. The main body 1 has a first end surface 3 and a second end surface 4 that face each other. A tapered through hole 5 is formed so as to penetrate the one end surface 3 and the other end surface 4 of the main body 1. Both the opening 6 in one end surface 3 and the opening in the other end surface 4 of the through hole 5 have a circular shape. In the present embodiment, the area of the opening on the other end face 4 is larger than the area of the opening 6 on the one end face 3. The lubrication part 2 is provided on the one end face 3 side and has a hole 2b through which the conductor 11 passes.

  With reference to FIG. 3, the structure of the dice | dies 10 and the stopper 15 is demonstrated. As shown in FIG. 3, the die 10 has a main body 1 and a lubricating part 2, and the stopper 15 has a stop surface 15A and another surface 15B. As shown in FIG. 3, the lubrication part 2 is disposed on the one end face 3 side of the main body part 1. On the other hand, the end surface 3 is a surface facing the stop surface 15A of the stopper 15. The friction coefficient of the lubrication part 2 is smaller than the friction coefficient of the one end surface 3 of the main body part 1. More specifically, the friction coefficient with respect to the stop surface 15 </ b> A of the lubricating portion 2 is smaller than the friction coefficient with respect to the stop surface 15 </ b> A of the one end surface 3 of the main body portion 1. The friction coefficient of the lubrication part 2 is 0.1 or less, for example. Also, a small frictional force means good slipperiness. The die 10 is made of an alloy, for example, and the stopper 15 is made of iron, for example.

  The lubrication part 2 is, for example, PTFE (Poly Tetra Fluoro Ethylene), DLC (Diamond Like Carbon), and lubricating oil. PTFE is a fluororesin composed of fluorine atoms and carbon atoms, and has a property of extremely low frictional force. DLC is a collective term for carbon thin films having high hardness, electrical insulation, infrared equivalence, and the like similar to diamond synthesized by, for example, a gas phase synthesis method using ions. The DLC coating has a very smooth surface due to its amorphous structure. As the lubrication part 2, nylon, polyethylene, polyacetal, polycarbonate, etc. can also be used. Preferably, the lubricating part 2 includes at least one of PTFE, DLC, and lubricating oil.

  The lubrication part 2 can be formed on the one end surface 3 of the die 10 by, for example, vapor deposition or coating. The thickness of the lubrication part 2 is 10 micrometers or more and 50 micrometers or less, for example.

  As shown in FIG. 4, the lubricating portion 2 is formed on the entire one end surface 3 of the main body portion 1, for example. Further, as shown in FIG. 5, the lubrication portion 2 is a circle of a virtual circle having a radius r centered in a direction (virtual axis X: see FIG. 2) through which the through hole 5 penetrates a part of one end surface 3. It may be arranged on the circumference. The planar shape of the lubricating portion 2 is, for example, a ring shape. Furthermore, the lubrication part 2 may have a plurality of lubrication regions 2a. As shown in FIG. 6, a plurality of lubricating regions 2 a may be formed concentrically on a part of one end surface 3 around the direction through which the through hole 5 penetrates (virtual axis X: see FIG. 2). Absent. The concentric circles are circles having the same center and different radii. In the present embodiment, the lubrication region 2a is disposed on the circumference of a circle having a radius r1 and on the circumference of a circle having a radius r2.

  Referring to FIG. 7, lubrication portion 2 may be formed on stop surface 15 </ b> A of stopper 15, for example. The stopper 15 is for restricting the movement of the die 10 in the moving direction of the conductor 11. This restricts the die 10 from moving downstream from the stop surface 15A. The stop surface 15 </ b> A is a surface facing the one end surface 3 of the die 10.

  When the lubrication part 2 is formed on the stop surface 15A, the friction coefficient of the lubrication part 2 is smaller than the friction coefficient of the stop surface 15A of the stopper 15. More specifically, the friction coefficient of the lubrication part 2 with respect to the one end surface 3 of the die 10 is smaller than the friction coefficient of the stop surface 15A with respect to the one end surface 3 of the die 10.

  As shown in FIG. 8, the lubrication part 2 may be formed in the whole stop surface 15A of the stopper 15, for example. Moreover, as shown in FIG. 9, the lubrication part 2 may be arrange | positioned on the circumference of the circle | round | yen of the radius r centering on the opening part 20 of the stopper 15 in a part of stop surface 15A. Furthermore, as shown in FIG. 10, a plurality of lubricating regions 2a may be formed concentrically around the opening 20 of the stopper 15 in a part of the stop surface 15A. In the present embodiment, the lubrication region 2a is arranged on the circumference of a circle having a radius r1 and on the circumference of a circle having a radius r2.

  Preferably, the lubricating portion 2 is formed on each of the one end surface 3 of the die 10 and the stop surface 15A of the stopper 15. Moreover, the material and arrangement | positioning of the lubrication part 2 formed in the one end surface 3 and the lubrication part 2 formed in 15 A of stop surfaces may be the same, and may differ.

  As described above, the insulated wire manufacturing apparatus 100 according to the present embodiment includes the die 10 and the stopper 15, and is lubricated on at least one of the one end surface 3 of the die 10 and the stop surface 15 </ b> A of the stopper 15. Part 2 is included. The friction coefficient of the lubrication part 2 is smaller than the friction coefficient of the surface on which the lubrication part 2 is provided (hereinafter referred to as the lubrication part mounting surface, and the surface facing the lubrication part 2 is referred to as the lubrication part facing surface). More specifically, the friction coefficient of the lubrication part 2 with respect to the lubrication part facing surface is smaller than the friction coefficient with respect to the lubrication part facing surface of the lubrication part mounting surface.

Here, the operation of the die 10 will be described.
First, when the conductor 11 to which the insulating paint is applied passes through the through hole 5 formed in the die 10, the inner side surface of the through hole 5 is in contact with the insulating paint applied to the outer peripheral surface of the conductor 11. When the conductor 11 is moved from the upstream side to the downstream side by the transport unit 13, a force is applied to the die 10 to pull up in the traveling direction X of the conductor 11 (that is, the upward direction in FIG. 1 and the direction opposite to gravity). This pulling force increases as the viscosity of the insulating paint increases. At the same time, since the die 10 has the mass of the die 10 itself, gravity is applied to the die 10. That is, the die 10 is in a floating state in which the gravity applied to the die 10 and the pulling force applied to the die 10 are balanced. When the viscosity of the insulating paint is high, the pulling force becomes larger than the gravity, so that the die 10 moves in the traveling direction X of the conductor 11.

  The die 10 that has moved in the traveling direction X of the conductor 11 comes into contact with the stop surface 15A of the stopper 15 that is located on the downstream side of the die 10. This stopper 15 prevents the die 10 from moving further downstream.

  11 and 12, when the insulating paint is applied to the conductor 11 by using the die 10 of the comparative example (that is, the die not having the lubricating portion 2), the die 10 is lifted by the viscosity of the insulating paint, One end surface 3 of the die 10 contacts the stop surface 15 </ b> A of the stopper 15. The die 10 cannot move with respect to the stopper 15 due to the frictional force between the one end surface 3 of the die 10 and the end surface of the stopper 15. When the conductor 11 passes through the through-hole of the die 10 while being twisted with the traveling direction as the rotation axis, the thickness of the insulating coating 24 applied to the conductor 11 varies as shown in FIG.

  Referring to FIG. 13 and FIG. 14, when insulating paint 24 is applied to conductor 11 having a square cross-section using die 10 of the present embodiment, conductor 11 is twisted with the traveling direction as the rotation axis. The thickness of the insulating paint 24 can be made uniform. The reason will be described below.

  In the die 10 of the present embodiment, the lubrication part 2 is formed on one end surface 3. Since the friction coefficient of the lubrication part is small, even if one end surface 3 of the die 10 contacts the stopper 15, the die 10 can move by sliding in a plane perpendicular to the penetration direction through which the through hole 5 penetrates by the lubrication part 2. It is.

  When the conductor 11 passes through the through-hole of the die 10 in a twisted state, when the thickness of the insulating paint 24 existing between the outer peripheral portion of the conductor 11 and the inner wall portion of the die 10 is thick, the viscosity of the insulating paint 24 causes the die to die. The force applied to the die 10 differs depending on the viscosity of the insulating paint 24 when the thickness of the insulating paint 24 is thin.

  When the insulating paint is applied to the conductor 11 using the die 10 and the stopper 15, the die 10 is not fixed to the stopper 15, and the force applied to the die 10 is made uniform by the viscosity of the insulating paint 24. Can freely rotate around an axis extending in the traveling direction of the conductor 11, or can move within a plane orthogonal to the through direction X through which the through hole 5 passes. As a result, the die 10 moves so as to follow the twist of the conductor 11, so that the thickness of the insulating coating 24 applied to the outer peripheral portion of the conductor 11 becomes uniform.

Next, the manufacturing method of the insulated wire which concerns on this Embodiment is demonstrated.
With reference to FIG. 1, first, the conductor 11 passes through the application portion 12 positioned in the uppermost stream of the movement path of the conductor 11, so that the first layer of insulating paint is applied to the outer peripheral surface of the conductor 11. Thereafter, the conductor 11 to which the first layer of insulating paint is applied passes through the through hole 5 formed in the die 10. At this time, the first layer applied to the outer peripheral surface of the conductor 11 is obtained by following the twist of the conductor 11 and rotating the die 10 in a plane whose normal is the penetration direction X through which the through hole passes. The thickness of the insulating paint is controlled to be constant. Thereafter, the conductor 11 that has passed through the through hole 5 of the die 10 moves to the drying heating device 16. In the drying heating device 16, the insulating coating applied on the conductor 11 is dried. Thereafter, the conductor 11 moves to the curing heating device 17. In the heating device 17 for curing, the insulating coating applied to the conductor 11 is cured.

  The conductor 11 to which the first-layer insulating coating is applied moves to the second application portion 12. In the 2nd application part 12, the 2nd layer insulating paint is applied on the 1st layer insulating paint. The first-layer insulating paint and the conductor 11 on which the second-layer insulating paint is applied pass through the through hole 5 of the second die 10. The size of the through hole 5 of the second die 10 is larger than the size of the through hole 5 of the first die 10. The conductor 11 passes through the through hole 5 of the second die 10.

  The first-layer insulating paint and the conductor 11 on which the second-layer insulating paint is applied pass through the drying heating device 16 and the curing heating device 17, and the second-layer insulating coating is dried and cured. Is done. By repeating the coating, drying, and curing a predetermined number of times (n times: for example, 10 times), an n-layer insulating coating is applied to the outer peripheral surface of the conductor 11. As described above, the insulated wire is manufactured by applying the insulating paint to the conductor 11.

  The dice 10 and the stopper 15 have the above-described configuration, and the dice 10 are restricted from moving in the moving direction of the conductor 11 by the stopper 15. The lubricating portion 2 is provided on at least one of the one end surface 3 of the die 10 and the stop surface 15A of the stopper 15. The friction coefficient of the lubrication part 2 is smaller than the friction coefficient of the surface where the lubrication part 2 is provided.

  Further, as the insulating paint 24 used in the present embodiment, for example, an enamel-coated constituent resin dissolved in a solvent is used. This constituent resin is not particularly limited as long as it has high insulating properties and high heat resistance. Specifically, a polyamide resin, a polyimide resin, a polyamideimide resin, a polyesterimide resin, or the like can be suitably used. As the solvent, N-methyl-2-pyrrolidone or cresol can be used.

  Specific examples of the conductor 11 include, for example, copper wire, copper alloy wire, tin-plated copper wire, aluminum wire, aluminum alloy wire, steel core aluminum wire, copper fly wire, nickel-plated copper wire, silver-plated copper wire, copper Examples include covered aluminum wire.

Next, the effect of this Embodiment is demonstrated.
According to the die 10 according to the present embodiment, the lubricating portion 2 is disposed on the one end surface 3 of the main body portion 1, and the friction coefficient of the lubricating portion 2 is smaller than the friction coefficient of the one end surface 3 of the main body portion 1. . Further, according to the insulated wire manufacturing apparatus 100 and the insulated wire manufacturing method according to the present embodiment, the lubrication part 2 is disposed on at least one of the one end face 3 and the stop face 15A, and the friction of the lubrication part 2 The coefficient is smaller than the friction coefficient of the surface on which the lubrication part 2 is provided. Thereby, the dice | dies 10 can move easily with respect to the stopper 15 compared with the case where it does not have the lubrication part 2. FIG. Therefore, even when the conductor 11 is twisted or eccentric, the die 10 can move following the twist or eccentricity of the conductor 11. As a result, variations in the thickness of the insulating paint 24 applied to the conductor 11 can be reduced.

  In the present embodiment, the lubricating part 2 includes at least one of PTFE, DLC, and lubricating oil. Thereby, the lubrication part 2 can be formed easily.

  In the present embodiment, the lubrication part 2 is arranged concentrically around a virtual axis X along the through hole 5. Thereby, by suppressing that the one end surface 3 of the die 10 is inclined with respect to the stop surface 15 </ b> A of the stopper 15, variation in the thickness of the insulating coating 24 applied to the conductor 11 can be reduced.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Main-body part, 2 Lubrication part, 2a Lubrication area | region 3 One end surface, 4 The other end surface, 5 Through-hole, 6 Opening part, 11 (Plane) conductor, 12 Application | coating part, 13 Conveyance part, 15 Stopper, 15A Stop surface, 16 Heating device for drying, 17 Heating device for curing, 20 openings, 24 Insulating paint, 100 Manufacturing device.

Claims (5)

A main body having one end face and the other end face facing each other, and having a through-hole penetrating between the one end face and the other end face;
A lubricating part disposed on the one end surface of the main body part,
A die whose friction coefficient of the lubrication part is smaller than the friction coefficient of the one end face of the main body part.   The die according to claim 1, wherein the lubricating portion includes at least one of PTFE, DLC, and lubricating oil.   The die according to claim 1, wherein the lubrication part is disposed concentrically around a virtual axis along the through hole. An application part for applying insulating paint to the conductor;
A die for adjusting the thickness of the insulating coating applied to the conductor by the application unit;
A stopper for limiting the movement of the die toward the direction of movement of the conductor,
The die includes a main body having a first end surface and the second end surface facing each other, and having a through hole penetrating between the first end surface and the second end surface.
The stopper includes a stop surface facing the one end surface of the die, and further includes a lubrication portion disposed on at least one of the one end surface and the stop surface,
The apparatus for manufacturing an insulated wire, wherein a friction coefficient of the lubrication part is smaller than a friction coefficient of a surface on which the lubrication part is provided. Applying an insulating paint to the conductor;
A step of passing the conductor through a through-hole of a die in order to adjust the thickness of the insulating coating applied to the conductor after the applying step;
The die is restricted to move in the moving direction of the conductor by a stopper,
The die includes a main body portion having one end face and the other end face facing each other, and having the through hole penetrating between the one end face and the other end face,
The stopper includes a stop surface facing the one end surface of the die,
A lubrication part is provided on at least one of the one end surface and the stop surface,
The method for manufacturing an insulated wire, wherein a friction coefficient of the lubrication part is smaller than a friction coefficient of a surface on which the lubrication part is provided.

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