JP2024092152A - Coil wire manufacturing method - Google Patents

Abstract

[Problem] To provide a method for manufacturing a coil wire that can produce a coil wire with a stable shape. [Solution] The method for manufacturing a coil wire according to the present disclosure is a method for manufacturing a coil wire by peeling off a portion W2a of the insulating coating W2 from a coil wire material W10 including a conductor wire W1 and an insulating coating W2 covering the conductor wire W1, and includes a step ST1 of sandwiching the coil wire material W10 between two punches M1, M2 and pressing the two punches M1, M2 together to crush the coil wire material W10 and separate the portion W2a of the insulating coating W2 from the conductor wire W1, and a step ST3 of cutting off the separated portion W2a of the insulating coating W2 from the coil wire material W10 using blades M31, M32. [Selected Figure] Figure 1

Description

This disclosure relates to a method for manufacturing coil wire.

The manufacturing method of electric wire for rotating electric machine windings disclosed in Patent Document 1 includes a stretching process and a cutting process. In the stretching process, an electric wire having a resin-coated first conductor portion is stretched so that a portion of the wire becomes thinner to form a second conductor portion, and the resin coating is peeled off. In the cutting process, the stretched second conductor portion is cut in the middle, and the peeled resin coating is removed from the second conductor portion.

JP 2004-336882 A

The present inventors have discovered the following problems.
In such a manufacturing method of an electric wire for a rotating electric machine winding, in the drawing step, an electric wire having a resin-coated first conductor portion is drawn so that a portion of the electric wire becomes thinner. When a plurality of electric wires for a rotating electric machine winding are manufactured, the plurality of electric wires for a rotating electric machine winding may have different shapes. As a result, the shapes of the electric wires for a rotating electric machine winding may not be stable.

This disclosure was made in consideration of the above-mentioned problems, and provides a method for manufacturing coil wire that can produce coil wire with a stable shape.

A method for producing a coil wire according to the present disclosure includes:
A method for manufacturing a coil wire, comprising the steps of: manufacturing a coil wire by peeling off a part of an insulating coating from a coil wire material having a conductor and an insulating coating covering the conductor, the method comprising the steps of:
a step of sandwiching the coil wire between two punches and pressing the two punches together to crush the coil wire, thereby separating a portion of the insulating coating from the conductor;
and using a blade to cut away a portion of the spaced apart insulating coating from the coil wire.

According to this configuration, the coil wire is manufactured by performing a crushing process on the coil wire material. The coil wire manufactured by the crushing process has a more stable shape than the coil wire manufactured by stretching. Therefore, it is possible to manufacture a coil wire with a stable shape.

This disclosure makes it possible to manufacture coil wire with a stable shape.

FIG. 1 is a schematic diagram showing a method for manufacturing a coil wire according to a first embodiment. Fig. 2(a) is a diagram showing a top view of the mold device, Fig. 2(b) is a diagram showing a front view of the mold device, and Fig. 2(c) is a diagram showing a side cross section of the mold device taken along the line IIC-IIC in Fig. 2(b). Fig. 3(a) is a photograph showing a side view of an example of a coil wire that has been subjected to a crushing process, and Fig. 3(b) is a photograph showing an upper portion of an example of a coil wire that has been subjected to a crushing process.

Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following descriptions and drawings have been simplified as appropriate for clarity of explanation.

<First embodiment>
A method of manufacturing a coil wire according to the first embodiment will be described with reference to FIGS.

Naturally, the right-handed XYZ coordinate system shown in Figure 1 and other drawings is for the convenience of explaining the positional relationships of the components. Normally, the positive Z axis is vertically upward, and the XY plane is a horizontal plane, which is common between the drawings. Note that hatching has been omitted in Figures 2(a), (b), and (c).

As shown in FIG. 1, punches M1 and M2 are used to crush the coil wire W10 (step ST1). Specifically, the coil wire W10 is placed between punch M1 and punch M2. The coil wire W10 is sandwiched between punch M1 and punch M2, and punch M1 and punch M2 are pressed together. As a result, the coil wire W10 is compressed and plastically deformed. The diameter of the compressed portion of the coil wire W10 is reduced. In this compressed portion, the adhesion between a portion W2a of the insulating coating W2 and the conductor W1 is reduced, and the portion W2a of the insulating coating W2 is separated from the conductor W1.

The coil wire W10 comprises a conductor W1 and an insulating coating W2. The conductor W1 is a string-like body made of a material with good electrical conductivity. The insulating coating W2 covers almost the entire outer surface of the conductor W1. The insulating coating W2 is a film-like body made of a material with lower electrical conductivity than the material of the conductor W1. Such a material is an insulating resin, for example, enamel resin. In addition, such a material may have a different plastic deformability compared to the material of the conductor W1. If the plastic deformability is different, a portion W2a of the insulating coating W2 may be easily lifted up or separated from the conductor W1.

The punches M1 and M2 may be incorporated into a die device M10 shown in, for example, Figures 2(a), (b), and (c). The die device M10 includes punch M1, punch M2, a feed device M3, and an actuator M4. Note that the actuator M4 is not shown in Figure 2(a). The punch M1 is held above the punch M2 so that it can move in the vertical direction (here, the Z-axis direction). The feed device M3 feeds the coil wire W10 between the punch M1 and punch M2. The actuator M4 pushes the punch M1 toward the punch M2 (here, the negative Z-axis direction).

The coil wire W210 shown in Figures 3(a) and (b) is an example of the coil wire W10 in which a portion W2a of the insulating coating W2 is separated from the conductor W1 in step ST1. As shown in Figures 3(a) and (b), the cross-sectional shape of the coil wire W210 is substantially rectangular. A portion W22a of the insulating coating W22 of the coil wire W210 is separated from the conductor wire (not shown).

Next, as shown in FIG. 1, the coil wire W10 is cut (step ST2). For example, while a portion of the coil wire W10 is restrained using a die M21, a shear force is applied to a portion of the coil wire W10 adjacent to the restrained portion using a punch M22, thereby cutting the coil wire W10.

Finally, the blades M31 and M32 are used to cut off the portion W2a of the insulating coating W2 from the coil wire W10 (step ST3). Specifically, the blades M31 and M32 are moved while in contact with the boundary between the portion W2a of the insulating coating W2 and the remainder of the insulating coating W2, cutting off the portion W2a of the insulating coating W2. This exposes the portion W1a of the conductor W1 that was covered by the portion W2a of the insulating coating W2.

As a result, a coil wire can be manufactured in which a portion W2a of the insulating coating W2 has been peeled off from the conductor wire W1. According to the coil wire manufacturing method of the above-described embodiment 1, in step ST1, the coil wire W10 is crushed without the need to stretch the coil wire W10. The coil wire W10 that has been crushed has a more uniform shape than a stretched coil wire. Therefore, a coil wire with a stable shape can be manufactured.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. The present invention may also be implemented by combining the above-described embodiments or examples thereof as appropriate. For example, the coil wire manufacturing method according to the above-described embodiment 1 includes steps ST1, ST2, and ST3, but step ST2 may be omitted as appropriate. In other words, the coil wire manufacturing method according to embodiment 1 may include only steps ST1 and ST3.

W10, W210 Coil wire W1 Conductor W1a Part W2, W22 Insulating coating W2a, W22a Part M10 Die unit M1, M2 Punch M3 Feeder M4 Actuator M21 Die M22 Punch M31, M32 Blade ST1, ST2, ST3 Process

Claims (1)

A method for manufacturing a coil wire, comprising the steps of: manufacturing a coil wire by peeling off a part of an insulating coating from a coil wire material having a conductor and an insulating coating covering the conductor, the method comprising the steps of:
a step of sandwiching the coil wire between two punches and pressing the two punches together to crush the coil wire, thereby separating a portion of the insulating coating from the conductor;
and cutting the spaced apart portion of the insulating coating from the coil wire using a blade.
A method for manufacturing coil wire.

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