JPS61285617A - Manufacture of flat insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Background and purpose of the invention] The present invention relates to a method of manufacturing a rectangular insulated wire.

In recent years, as electrical equipment has become smaller and lighter, there has been a demand for coils for electrical equipment to be wound with a high space factor. Flat insulated wires are effective in increasing the space factor of coils for electrical equipment, and thin rectangular insulated wires in particular have an extremely high space factor, making them ideal for use in small flat motors and thin high-frequency transformers. Used for coils, etc.

Conventionally, when manufacturing this type of thin rectangular insulated wire,
Formed by rolling a metal conductor with a round cross section into a rectangular cross section or cutting a large number of metal foil strips into narrow widths to form a rectangular wire rod, and then applying an insulating paint such as enamel paint to the wire rod. Was.

However, according to these manufacturing methods, in the process of insulation treatment, an insulating coating 4 is formed on the corner 3 of the edge 2 of the metal conductor 1, as shown in FIG. 6, due to the influence of the surface tension of the insulating paint. is difficult to form, and there is a risk that the corner portion 3 of the metal conductor 1 will be exposed and the insulation performance will be extremely degraded. In addition, the insulating coating 4 on the flat surface of the metal conductor 1 near the edge portion 2
becomes thicker, the insulating coating 4 at the center of the flat surface becomes thinner, and the insulated wire becomes a so-called dogbone shape.
When the insulated wire was wound flatwise as shown in FIG. 7, the space factor of the coil tended to decrease.

In addition, in the flatwise winding coil structure, since the R parts 5, 5 of the wire are close to each other, the R part 5 of the wire
If the film coverage is poor, this is a factor that causes frequent rare shorts. Note that one way to improve insulation performance is to thicken the insulation film, but this method reduces the space factor of the coil, etc., eliminating the advantage of making the wire into a rectangular shape, making it an effective method. Yes, it wasn't a good idea.

An object of the present invention is to provide a novel method for manufacturing a rectangular insulated wire that eliminates the drawbacks of the prior art described above, improves insulation performance, and can manufacture a rectangular insulated wire with a high space factor. .

[Summary of the Invention] In order to achieve the above object, the present invention applies an insulating paint to the surface of a strip-shaped metal foil to form an insulating coating on the surface of the metal foil, and after forming the insulating coating, the The metal foil is cut into thin strips to form a rectangular wire rod, and the edge surface of the metal conductor exposed on the cut surface of the wire rod is etched and dissolved away. The surface is coated with an insulating paint to form an insulating coating.

According to this method, an insulating film layer having a uniform thickness can be formed in the central region of the strip-shaped metal foil, so that a narrow rectangular wire rod can be formed in the cutting process while having this insulating film. Moreover, the above-mentioned insulated wave Hff
By performing an etching process and an insulating coating process on the edge surface in addition to the i-processing, a uniform insulating coating layer with good coating coverage can be formed on the entire surface of the rectangular wire. [Embodiment] An embodiment of the present invention will be described based on FIGS. 1 to 5.

10 is copper, aluminum (including alloys), nickel,
A strip-shaped metal foil made of a conductive material such as nichrome is coated with one or more types of enamel paint (insulating paint) such as polyurethane, polyester, polyimide, polylamitoimide, etc. on the surface of the metal foil 10.1. The enamel paint hardens and an insulating coating 11 is formed on the surface of the metal foil 10.

The way the insulating film 11 is applied is that the area near the edge 12 of the flat surface of the metal m10 has a dogbone shape due to the surface tension of the enamel paint (see Figure 1), but the surface tension of the other flat surfaces is relatively uniform. Insulating film 11
is uniformly coated with a predetermined thickness. After this insulation treatment, the central band portion of the metal foil 10 is cut using a plurality of cutters 13 arranged in parallel, as shown in FIG. , these wire rods 14
is wound up by a winding roll 15. In this cutting process, the metal foil 10 is cut to be slightly wider than the conductor width of the rectangular insulated wire after completion of manufacturing.

After cutting the metal foil 10, the metal conductor 10' exposed on the cut surface
(cut metal foil 10) has edge surfaces 16 on both sides.
For example, if the metal conductor 10'' is made of copper, a portion of the conductor is dissolved and removed using an etching solution such as ferric chloride or cupric chloride.
As shown in FIG. 4, the insulating film 11- (the insulating film after cutting the metal foil 10) is made to protrude outward from the edge surface 16. In this etching process, the etching solution is
l'o −/LzLTIy 2 planes 1608 Solution 1 plane section 608
Solution 1: In this way, the width of the metal conductor 10-0 is formed to be the same as the width of the conductor 8 of the rectangular insulated wire.
: Next, the edge surface 16 of the metal conductor 10" is insulated. 1: One or more types of enamel that are the same or different from the coating 11- i"'°"g6"'""
'"s"t[17ti*t6&1JFE.

Conductor 10" full surface insulation film 80, rectangular insulation 2 wires
'! □ is formed.
111: The enamel paint used for the insulation coating has a low viscosity,
1) i (If a material with low surface tension and high permeability is used, the uniformity of the insulation coating can be improved.
6-sided coating 6 insulation coating I self-fusing paint 1 may be used.

According to this example, the strip metal foil 10 k-jl with a large surface area
l Metal 110 flannel for applying insulating paint
((Insulating coating 11 having a uniform thickness over most of the surface.

is formed, and gold is also removed during the cutting and etching processes.
The conductor 10- can be formed to have an arbitrary conductor width, and the insulating film 17 is formed on the edge surface 16 after etching.
The throwing power of the metal conductor 10- is also improved, and it is possible to manufacture a rectangular insulated wire in which a uniform layer of insulation coating is applied over the entire surface of the metal conductor 10-.

Therefore, according to this example, (1) it is possible to obtain a thin rectangular electric wire that is effective for reducing the size, weight, and performance of electrical equipment, etc., and (2) it is possible to obtain a rectangular electric wire with a thin size that is effective for reducing the size and weight of electrical equipment, etc., and (2) to reduce the space factor of coils, etc. for electrical equipment. (3) In flatwise coil winding, insulation reliability between wires can be improved; (4)
It is now possible to manufacture rectangular insulated wires with any conductor width through etching processing, especially when the width/
It has advantages such as being effective in manufacturing rectangular insulated wires with a large thickness ratio.

[Effects of the Invention] As described above, according to the present invention, it is possible to improve the insulation performance and manufacture a rectangular insulated wire with a high space factor. can be provided.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing a state in which an enamel paint is coated on a metal foil.
Figure 2 is a schematic perspective view showing the state in which the metal foil has been cut;
The figure is a cross-sectional view of the metal foil after cutting, Figure 4 is a cross-sectional view showing the etching process, Figure 6 is a cross-sectional view of a rectangular insulated wire manufactured by the conventional manufacturing method, and Figure 7 is a cross-sectional view of a conventional flat insulated electric wire. FIG. 3 is a cross-sectional view showing a state of widthwise winding. DESCRIPTION OF SYMBOLS 10...Metal foil, 10-...Metal conductor, 11.11''...Insulating coating, 14...Wire, 16...Edge surface, 17...Insulating coating. Agent: Patent attorney Sa Fujio Fujio - No. 10

Claims (1)

[Claims] (1) Apply an insulating paint to the surface of a strip-shaped metal foil to form an insulating coating on the surface of the metal foil, and after forming the insulating coating, cut the metal foil into thin strips to form rectangular wire rods. death,
The edge surface of the metal conductor exposed on the cut surface of the wire is etched and dissolved away, and an insulating paint is applied to the edge surface of the metal conductor after being dissolved and removed to form an insulating coating. A manufacturing method for rectangular insulated wire.