JPH0546647B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing a rectangular conductor, and particularly to a method for manufacturing a rectangular conductor, in which an insulating coating is applied to at least one surface of a rectangular conductor and corners located on both sides of this surface. The present invention relates to a method of manufacturing a rectangular wire having a flat surface.

[Technical background of the invention]

A sliding transformer for medical equipment and the like has a structure in which a rectangular wire 2 is wound edgewise around the outer periphery of a paper cylindrical body 1 for about 200 turns, as shown in FIG. In such a sliding transformer 3, since the roller electrode slides on the outside 4 of the edgewise-wound flat wire 2, it is necessary to keep the outer circumferential surface of the flat wire 2 in the same plane with high accuracy. The insulation coating on the inside 5 and outside 4 of the layer is removed.

That is, the rectangular wire 2 used for such purposes
As shown in FIG. 6, enamel coatings 8, 8 are formed on opposing planes 7, 7 on a rectangular conductor 6, and a corner having other planes 9, 9 and curved surfaces located on both sides of this plane. The parts 10, 10, . . . have a structure in which conductor surfaces without insulation coating are exposed.

[Problems with background technology]

A rectangular wire with a conductive surface on a part as shown above is
This is possible when the insulating coating consists of longitudinally attached insulating paper, but for enamelled wires, it is not possible using the conventional die method, and an effective manufacturing method that can be put to practical use has not yet been established.

[Purpose of the invention]

The present invention was made based on the above circumstances, and
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.

[Summary of the invention]

That is, in the method for manufacturing a rectangular wire of the present invention, synthetic resin powder is applied to the surface of rectangular conductors that are continuously fed into a powder coating chamber, and then at least one of the rectangular conductors that has passed through the powder coating chamber is coated with synthetic resin powder. A powder removal plate made of an elastic material is pressed onto the conductor surface including the surface and the corners located on both sides of this surface to remove the synthetic resin powder,
Then, after hardening the synthetic resin powder on the rectangular conductor by passing it through a heating furnace, the surface of the rectangular conductor in the part from which the powder has been removed is polished using an abrasive.
The present invention is characterized in that a rectangular conductor is manufactured in which at least one surface of the rectangular conductor and corners located on both sides of the rectangular conductor are not coated with insulation.

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

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings.

FIG. 4 is a block diagram schematically showing an embodiment of the method of the present invention.

In FIG. 4, synthetic resin powder such as epoxy resin is applied to the outer periphery of the rectangular conductor 6 supplied from the conductor supply bobbin 11 in the powder coating section 12, and then the conductor is exposed in the powder removal section 13. After the synthetic resin powder on the surface that needs to be removed is removed, 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. The rectangular wire 2 having a synthetic resin coating layer formed on a predetermined surface is further polished onto a conductive surface in a polishing section 15 and then wound onto a winding bobbin 16 .

As shown in FIG. 2, the powder removing section 13 described above has a
Powder removal plates 17 and 17' are provided on side surfaces 9 and 9 of the rectangular conductor 6, respectively, and are arranged to face each other.
Since these powder removal plates are made of an elastic material such as rubber, in a state where they are pressed against the side surfaces 9, 9, the corner portions 10 located on the side surfaces and on both sides thereof,
10, . . . to form a powder layer 8' on the rectangular conductor.

As shown in FIG.
is a plurality of powder removal plates 17 to 20 and 17' to
20', and the spaces (not shown) between the adjacent powder removal plates 17 and 18, 17' and 18', 19 and 20, and 19' and 20' are connected to the intake holes of the dust collector. , the synthetic resin powder removed on the rectangular conductor 6 during this period is discharged in the direction of the arrow.

Each of the above adjacent powder removal plates, e.g. 17 and 1
8 may be formed of a cylindrical body having these as side walls facing each other, and in this case, the exhaust efficiency can be improved.

As shown in FIG.
a cylindrical base material 22 fixed to the outer periphery of 1; a rotating brush 24 made of a large number of synthetic resin fibers 23 such as nylon attached radially to the outer periphery;
A protective member 25 is provided on the outside of the synthetic resin coating.

In FIG. 3, the rotating shaft 21 is driven to rotate in a direction opposite to the direction in which the rectangular conductor 6 moves, and the rotating brush 24 polishes the surface of the plane 9 from which the synthetic resin powder has been removed and the corners 10 located on both sides of the plane 9. do. At this time, the synthetic resin coating 8 on the rectangular conductor 6 is protected by a protective member 25 having approximately the same width as the synthetic resin coating 8.

In the above embodiments, a case has been described in which the abrasive part is composed of a rotating brush, but the abrasive part is not limited to this, and for example, a plurality of sheets of sandpaper may be used for polishing.

〔Effect of the invention〕

As described above, according to the method of the present invention, after the synthetic resin powder is applied to the entire circumferential surface of a rectangular conductor, the powder removal plate is pressed to remove the powder from a predetermined portion. After heating this, by polishing the conductor surface, a rectangular wire having at least one surface on the rectangular conductor and the corners located on both sides of this surface without an insulating coating is easily manufactured. It also has the advantage that the purpose can be achieved by simply modifying conventional powder coating equipment.

[Brief explanation of the drawing]

FIG. 1 is a plan view including a partial cross section showing an embodiment of the method of the present invention, FIG. 2 is a sectional view taken along line A-A' in FIG.
Fig. 3 is a sectional view taken along line B-B' in Fig. 1, Fig. 4 is a block diagram showing an outline of the method of the present invention, and Fig. 5 is a sliding transformer using a rectangular wire obtained by the method of the present invention. FIG. 6 is a cross-sectional view of a rectangular wire obtained by the present invention. 2...Flat wire, 3...Sliding transformer, 6...Flat conductor, 8...Enamel coating, 12...Powder coating section, 13...Powder removal section, 14...Heating furnace, 15
... Polishing section, 17-20, 17'-20' ... Powder removal plate, 24 ... Rotating brush, 25 ... Protection member.

Claims (1)

[Claims] 1. After coating synthetic resin powder on the surface of a rectangular conductor that is continuously fed into a powder coating chamber, at least one surface of the rectangular conductor after passing through the powder coating chamber and the corners located on both sides of this surface The synthetic resin powder is removed by pressing a powder removal plate made of an elastic material onto the conductor surface including the rectangular conductor, and then passed through a heating furnace to harden the synthetic resin powder on the rectangular conductor. By polishing the surface of the rectangular conductor in the body-removed portion using an abrasive material, it is possible to manufacture a rectangular conductor in which at least one surface of the rectangular conductor and the corners located on both sides of this surface are not coated with insulation. Characteristic manufacturing method of flat wire.