JPS6032937B2 - Manufacturing method of flat insulated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rectangular insulated wire, and more particularly to a method for manufacturing a wide rectangular insulated wire.

Conventionally, rectangular insulated wires have been manufactured by applying insulating paint to a rectangular conductor with a rectangular cross section and baking it, or by rolling a round insulated wire with a circular cross section into a rectangular shape. It's here.

In the former manufacturing method, it is difficult to obtain a rectangular conductor with a uniform coating on the edge portion similar to that on a flat surface.

Therefore, the use of such rectangular insulated wires has the disadvantage of shortening the reliability of the coil and shortening the life of the entire device. In the latter manufacturing method, the edge portions of the rectangular conductor are coated uniformly in the same manner as the flat surface, increasing the reliability of the coil, but it is difficult to manufacture a coil with a width to thickness ratio of 5 or more.

That is, if the ratio of the width to the thickness is 5 or more, the adhesion between the film and the conductor may deteriorate, or cracks may occur in the film. As one method for solving the drawbacks of the latter manufacturing method, a wide rectangular insulated wire can be manufactured by arranging and bonding a plurality of rectangular insulated wires.

However, this method has the following drawbacks. [1'
There are cases where the thicknesses A and B of lines arranged in parallel do not match.

(Refer to Figure 1) [2] Only the sides of the lines arranged in parallel are adhered, but the adhesive force between the lines is not necessarily sufficient.

Furthermore, the effective cross-sectional area of the bonded portion is small. (See Figure 2 a) {
3' It is difficult to glue multiple lines in parallel without getting stuck. (See FIG. 3) The present invention provides a new method for manufacturing a wide rectangular insulated wire that solves the above problems.

That is, in the present invention, a plurality of insulated wires, each of which has been coated and baked with insulating paint on a conductor, are lined up in parallel and bonded together, rolled into a rectangular shape using a rolling roller at the same time or after bonding, and then coated with the same or different type of paint. It is characterized by baking, and obtains a wide insulated wire that is integrated as a whole. The manufacturing method of the present invention will be explained in detail below with reference to FIG. 4, which illustrates the method.

However, it is not limited to this. Line up the insulated wires (see figure b) in which the conductor 1 (see figure a) is coated and baked with insulating paint 2 in parallel, and apply adhesive 3 to the contact points or the entire wire.
Apply and adhere (see Figure c). A plurality of bonded insulated wires are rolled into a flat rectangular shape with a rectangular cross section. By applying the same or different type of paint 4 once or several times to the insulated wires that have become parallel after rolling, they can be made wider and more expensive.
A high quality flat insulated wire is manufactured. (See Figure d) In the present invention, a plurality of insulated wires arranged in parallel may have the same conductor size or may have different conductor sizes.

Further, the insulating film to be coated may be the same for the husband and wife, or may be different. In some cases, a plurality of round insulated wires and a plurality of rectangular insulated wires may be bonded together.
In this case, hot-melt adhesives or solvent-based adhesives containing low boiling point solvents as the main ingredient are used as adhesives for bonding multiple insulated wires arranged in parallel. Any adhesive may be used as long as the insulated wires adhere well to each other immediately before rolling and the adhesive function is not deteriorated by rolling.

In addition, when rolling while adhering, any adhesive may be used as long as the green material adheres well to each other after rolling. As the hot-melt adhesive, polyamide-based, epoxy-based, phenol-modified epoxy-based, epoxy-modified polyester-based materials, etc. are used.

Epoxy, phenol-modified epoxy, polyester, polyamideimide, polyimide, etc. are used as solvent-based adhesives, and acetone, methyl ethyl ketone, toluene, xylene, m-cresol, pyrrolidone, etc. are used as solvents. .

If the adhesive strength is insufficient during rolling, the wires may peel off from each other, which is not preferable.

After applying adhesive to increase the adhesive strength,
It is also possible to install a drying or dawning process.
In addition, in the case of rolling while adhering, a drying or aging process can be carried out after rolling in order to further strengthen the adhesion between the wires after rolling. The plurality of bonded insulated wires are then rolled.

When subjected to rolling, the film generally undergoes processing deterioration, so
Characteristics deteriorate. In order to compensate for the deterioration in characteristics, an insulating paint of the same type or a different type is applied as described above. Among different types of paints, for example, if a self-fusing paint is applied and baked, a rectangular insulated wire with a self-fusing function can be obtained.
Rolling affects not only the film but also the conductor.

That is, the conductor is work hardened by rolling. In order to obtain work hardening, it is necessary to heat-treat the conductor to soften it. This heat treatment may be carried out immediately after rolling, or may be carried out at the same time as applying the same or different type of paint. Depending on the case, heat treatment may be performed after coating and baking the same or different types of paint. Examples of the present invention will be described below. Example 1 Two polyamide-imide insulated wires with a conductor diameter of 0.4 mm and two types of structure were arranged in parallel, bonded using epoxy adhesive, rolled, and then coated with polyamide-imide insulation paint. was applied using felt, and then heated in a dovetail furnace (furnace length: 2.6 mm, furnace temperature: 400°C).

The number of times of coating was 4 times, and the winding speed was 25 mm/min. Table 1 shows the properties of the obtained rectangular insulated wire. Example 2 Three polyamide-imide insulated wires with a conductor diameter of 0.26 willow and two types of structure were arranged in parallel, bonded using a polyamide-imide adhesive, rolled, and then placed in a heat treatment furnace (furnace head). 1.5, and the furnace temperature was 500°C).

Thereafter, an epoxy-based self-fusing varnish was applied using felt, and the coating was applied in an oven (furnace length 2.6, oven temperature 350°C). The number of applications is 4 times, and the winding speed is 30w/nin.
And so. Table 1 shows the properties of the obtained rectangular insulated wire.
Example 3 Two polyamide insulated wires with two types of structure with a conductor diameter of 0.37 were lined up in parallel, bonded using a polyimide adhesive, rolled, and then coated with a polyamide insulating paint. It was applied using felt and baked in a baking furnace (furnace length 2.6, furnace temperature 400 oo).

The number of times of coating and baking was 3 times, and the line speed was 25/min. This electric wire was further heated in a heat treatment furnace (furnace length 1.5, furnace temperature 530).
℃) and wound at a linear speed of 25/mjn. Table 1 shows the properties of the obtained rectangular insulated wire. Example 4 Round insulated wire made by coating and baking polyamideimide insulating paint on a copper wire with a conductor diameter of 0.26 willow (coating thickness of 0.010 willow)
and conductor size thickness x width = 0.2 ribs x o. Two rectangular insulated wires (coating thickness 0.08 side) made by coating and baking polyamide insulating paint on an 80-rib rectangular conductor are lined up in parallel, bonded using polyamide-based adhesive, and then rolled. Subsequently, polyamideimide insulating paint and felt were applied, and the results were compared in a baking oven (furnace length: 2.6 skins, furnace temperature: 420 qo).

The number of times of coating and baking was 3 times, and the winding speed was 30 skins/min. This electric wire was further heated in a heat treatment furnace (furnace length: 1.5 m, furnace temperature: 5 m).
30oo) and wound at a linear speed of 30/min. Table 1 shows the properties of the obtained rectangular insulated wire. *1
Sample 10 skin was soaked in saturated sodium chloride chrycerin and measured at a rising rate of 70 V no seconds.

*2 Based on JIS C 3003K. *3 Sample length 2
Gently stretch the piece until it is cut, and inspect for cracks in the skin.

*4 Cut a sample length of 20 mm by rapid stretching and inspect the degree of lifting between the conductor and the film. Inspect the degree of lifting with the film. In connection with the description of the present invention, reference has been made to the case where the width to thickness ratio is 5 or more, but the wide rectangular insulated wire of the present invention is not limited thereto, and the width to thickness ratio is 5 or more. Of course, it is also effective when the number is less than 5.

Brief Description of the Drawings Figure 1 is an explanatory diagram of the case where the thicknesses of two wires do not match in the conventional manufacturing method of wide self-bonding rectangular insulated wire, and Figure 2 is a cross-sectional view of the wire. 3 is an explanatory diagram showing the difference in effective conductor cross-sectional area between the conventional manufacturing method (Fig. a) and the manufacturing method of the present invention (Fig. b); FIG. 4 is an explanatory diagram of the case where two wires are inclined in the method for manufacturing a wide self-bonding rectangular insulated wire of a secondary arm, and is a cross-sectional view of the wire, and FIG. 4 is an explanatory diagram of the manufacturing method of the present invention. It is a cross section of the electric wire, and it progresses from a to b to c to d.

1, 1'... Conductor, 2, 2'... Insulating film, 3, 3'... Adhesive, 4... Film coated and baked after rolling.

Talent! figure Soup 2 figure Soup 3 figure Sai 4 figure

Claims (1)

[Claims] 1. Line up multiple insulated wires that have been coated and baked with insulating paint on the conductor and glue them together in parallel, and at the same time or after the bonding,
Method 2 for producing a rectangular insulated wire, characterized by rolling it into a rectangular shape, then applying and baking the same or different type of paint Rolling it into a rectangular shape, then heat-treating the conductor, and then applying and baking the same or different type of paint Method 3 for manufacturing a rectangular insulated wire according to claim 1. Method 3 for manufacturing a rectangular insulated wire according to claim 1, which comprises rolling the wire into a rectangular shape, coating and baking the same or different type of paint, and then heat-treating the wire.