JPH01220310A - Manufacture of flat type wire - Google Patents

Abstract

PURPOSE:To easily manufacture a flat type wire having the surface where an insulating coat is unapplied by previously forming a high polymer coat on the conductor surface of the part where a fine particles is to be removed in order to remove the fine particle of the given part after a synthetic resin fine particle is adhered over the whole peripheral surface of a flat type conductor. CONSTITUTION:A flat type conductor 6 is supplied from a conductor supply bobbin 11, a high polymer solution is applied with an applying device 16 and dried with a drying device 17, then a synthetic resin fine particle such as an epoxy resin is adhered at a fine particle painting part 12, the synthetic resin fine particle on the surface at which the conductor is to be exposed in a fine particle removing part 13 is removed, after that, heated in a heating furnace 14 and the synthetic resin powder on the conductor 6 is heatedly fused to be cooledly solidified, and thereby wound to a winding bobbin 15. The device 16 is positioned in the both sides of these surfaces with the felt in which e.g., a corrosion solution, etc., is impregnated pressed to the surfaces to which the conductor 6 faces. The fine particle of side surfaces 9 and 9 or angle parts 10 and 10 is removed via the inlet port of a dust collection device with fine particle removal plates 18 and 18' composed of such as a rubber plate facing the surfaces 9 and 9 of the conductor 6 with the solution applied to the angle parts.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a rectangular wire, and in particular to a method for manufacturing a rectangular conductor, in which insulation is repeated on at least one surface of a rectangular conductor and on corners located on both sides of this surface. The present invention relates to a method for manufacturing a rectangular wire having a flat surface.

[Prior art] Conventionally, sliding transformers used in medical equipment, etc.
As shown in the figure, it has a structure in which a rectangular wire 2 is wound edgewise around the outer periphery of a cylindrical body 1, for example, about 200 turns. In such a sliding transformer 31, since the roller electrode slides on the outer periphery 4 of the flat wire 2 wound edgewise, the conductor must be exposed on this outer periphery, and the outer periphery must be precisely Since it is necessary to maintain the same level, the insulating coating on the inner side 5 and outer side 4 of the rectangular wire wound layer is removed.

That is, the rectangular wire 2 used for such purposes has two opposing flat surfaces 7. on the rectangular conductor 6, as shown in FIG.
An enamel coating 8.8 is formed on 7 and the other plane 9.9
The structure has no insulating coating and the conductor surface is exposed. In this case, it is preferable that the corner portions 10, 10, .

It is possible to manufacture a rectangular wire with a conductive surface on a portion as described above if the insulating layer is made of vertically laminated insulating paper, but it is not possible to manufacture enamelled wire using the conventional method using dies. As a means of manufacturing the above-mentioned rectangular wire, the present applicant applied synthetic resin powder to the surface of the rectangular conductor using a powder coating method, and then pressed a powder removal plate made of an elastic material. A method in which powder is removed from a predetermined area and then heated (Japanese Patent Application No. 59-250283), a method in which synthetic resin powder is removed by pressing a rotating roller (Japanese Patent Application No. 59-1983)
-253890) or apply synthetic resin powder to the surface of a rectangular conductor, then remove the powder on a predetermined surface using a powder removal plate, remove the remaining powder using adhesive tape, and heat it. We have previously filed an application for a method to do so (Japanese Patent Application No. 60-67490).

[The problem that the invention attempts to solve! ii] However, in any of the above methods, after removing the synthetic resin powder electrostatically deposited on the surface where the conductor is to be exposed, the synthetic resin powder on the surface where the insulating coating is to be applied is heated and hardened. However, it is difficult to completely remove the powder, and therefore post-treatment is required.

The present invention has been made to solve the above-mentioned difficulties.
By interposing a polymer film between the conductor and the synthetic resin powder on the surface where the conductor is to be exposed, and then removing it,
The object of the present invention is to provide a method for easily manufacturing a rectangular wire having conductive surfaces on at least one surface of a rectangular conductor and corners located on both sides of this surface by a powder coating method (electrostatic dynamic dipping method). do.

[Means for Solving the Problems] The method for manufacturing a rectangular wire of the present invention includes (a) a rectangular wire in which an insulating coating is not applied to at least one surface of a rectangular conductor and corners located on both sides of the rectangular conductor; A step of forming a polymer film on the part where the conductor surface is to be exposed; (b) a step of electrostatically depositing synthetic resin powder on the outer periphery of the rectangular conductor;
c) removing the polymer coating and the synthetic resin powder adhering to the outside thereof, and (d) then passing the rectangular conductor through a heating furnace to remove the synthetic resin powder adhering to the surface of the rectangular conductor. It is manufactured by a step of curing.

Synthetic resin powders suitable for use in the method of the invention include, for example, thermosetting resins and thermoplastic resins such as epoxy resins, polyester resins, and polyethylene.

Further, as the polymer film, one that forms a polymer film when the solvent evaporates is suitable. An example of such a solution is a collodion solution, that is, a solution in which nitrocellulose with a nitrogen content of 1O15 to 12.2% is dissolved in an ether/ethanol mixture. This easily forms a transparent semipermeable film (collodion film) when the solvent evaporates.

In order to facilitate the formation of the above-mentioned polymer film, a heating step may be included to evaporate the solvent prior to the deposition of the synthetic resin powder.

Further, the polymer coating and the synthetic resin powder on the outside thereof can be removed using a mechanical removal method as described in the above-mentioned section of the prior art.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram schematically showing an embodiment of the method of the present invention.

In FIG. 1, synthetic resin powder such as epoxy resin is coated on the outer periphery of the rectangular conductor 6 supplied from the conductor supply bobbin 11 in a powder coating section 12, and then powder removal section 1
After the synthetic resin powder on the surface where the conductor needs to be exposed is removed in step 3, the synthetic resin powder deposited on the rectangular conductor is heated in a heating furnace 14 to be heated and fused, and then cooled and solidified. Thereafter, it is wound onto the winding bobbin 15.

A coating device 16 for coating a polymer solution and a drying device 17 are arranged in this order between the conductor supply bobbin 11 and the powder coating section 12.

This coating device 16 presses felt impregnated with, for example, a collodion solution onto the opposing surfaces of the rectangular conductor 6.
The solution is applied to these surfaces and the corners located on both sides thereof, and the drying device 17 evaporates the solvent in the solution applied in this way to form a polymer film. It is located in

As shown in FIG. 2, the powder removing section 13 is equipped with powder removing plates 18 and 18' arranged opposite to each other on the side surfaces 9 and 9 of the rectangular conductor 6. Since the body removal plate is made of an elastic material such as rubber, when it is pressed against the side surface 9.9, it comes into contact with this side surface and the corners 10.10 located on both sides of the side surface and removes the powder. At the same time, a powder layer 8' is formed on the rectangular conductor.

The powder removal plate 18, 18' is composed of, for example, two parallel rubber plates, and the space between these rubber plates is connected to the air intake hole of the dust collector, and the rectangular conductor 6 removed between them is connected to the air intake hole of the dust collector.
Discharge the synthetic resin powder above.

Each of the adjacent powder removal plates described above may be formed of a cylindrical body having opposing side walls, and in this case, the exhaust efficiency can be improved.

An example in which a rectangular wire was manufactured using the apparatus shown in FIG. 1 will be described below.

Cross section 2. horizontally from the conductor supply bobbin. Omn X56
A rectangular copper conductor with a wire speed of 4. The rectangular conductor was fed out at a rate of 0.0 m/min, and felt impregnated with a collodion solution was pressed on the opposing widthwise faces of this rectangular conductor and the corners following this face, and then passed through a drying oven to form a polymer film. Then length 70c
Pass through the a+ powder coating chamber and apply EC to the outer periphery of the rectangular conductor.
After adhering P2O3 (trade name of epoxy synthetic resin powder manufactured by Sumitomo Durez Co., Ltd.) and removing the polymer film and the powder adhering to the outside by pressing a rubber plate, the furnace temperature was 40°C.
The synthetic resin powder on the wide surface was fused and cured by passing through a heating furnace with a temperature of 0 to 450°C and a furnace length of 3.5 m to form an insulating coating.The charging voltage of the above powder coating room was 55K
V, the amount of fluidizing air is 125 J2/1n.

The properties of the rectangular conductor thus obtained are shown in the table below. (Margin below) Note) $1) 30% elongation, 150℃X lhr*2) Sulfuric acid (
Specific gravity 1.2), NaOH (10%), room temperature 24 hours
[Effects of the Invention] As described above, according to the method of the present invention, after depositing synthetic resin powder over the entire circumferential surface of a rectangular conductor, before removing the powder from a predetermined portion, By forming a polymer coating on the surface of the conductor where powder is to be removed, it is easy to remove any insulating coating from at least one surface of the rectangular conductor and the corners located on both sides of this surface. It has the advantage that a rectangular wire having a surface can be manufactured, and that the purpose can be achieved with a simple modification of conventional powder coating equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of the method of the present invention, FIG. 2 is a sectional view showing a powder removal section, and FIG. 3 is a schematic diagram of a sliding transformer using a rectangular wire obtained by the method of the present invention. FIG. 4 is a sectional view of a rectangular wire obtained by the present invention. 6......Flat conductor 8...Enamel coating 12...Powder coating portion 13...Powder Removal section 14...Heating furnace 16...Coating device 17...Drying device 18.18'...Powder removal plate application Person: Showa Electric Wire Type Co., Ltd. Agent Patent Attorney Suyama Sa - (1 other person) Figure 3 Figure 4

Claims (1)

[Claims] (1) In a method for manufacturing a rectangular wire in which at least one surface of a rectangular conductor and the corners located on both sides of this surface are not coated with an insulating coating, (a) a polymer coating is applied to the portion where the conductor surface is to be exposed; (b) A step of electrostatically depositing synthetic resin powder on the outer periphery of the rectangular conductor; (c) A step of removing the polymer coating and the synthetic resin powder deposited on the outside thereof. (d) Then, passing the rectangular conductor through a heating furnace,
A method for manufacturing a rectangular wire, comprising the step of curing synthetic resin powder deposited on the surface of a rectangular conductor.