JPS59111207A - Method of producing 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 The present invention relates to a method for manufacturing a rectangular insulated wire suitable as a magnet wire.

Conventional - Insulating paint is baked by rolling a linear conductor coated with a film with a circular cross section from the vertical and horizontal directions into a nearly quadrilateral shape! A method was known in which a rectangular insulated wire was produced by F-forming and then heating. In this method, a linear conductor with a circular cross section, which had been carried out previously, is rolled from the top and bottom and left and right directions, or it is drawn with a die to become a rectangular wire without an insulating layer, and then an insulating paint is applied and baked. The method and the baking of the insulating paint in advance overcome the drawbacks of the method of rolling a linear conductor coated with a film and having a circular cross section from either the vertical or horizontal direction. be. That is, the former has the point that the insulation layer at the corner part of the rectangular insulated wire obtained by CIA is thinner than the flat part, and the dielectric strength voltage at the corner part is lower than the flat part, while the latter has. This overcomes the problem that when the semicircular parts formed at both ends in the width direction are wound, the porosity increases and the space factor of the wire part decreases, and the whole is covered with an insulating layer of uniform thickness. Moreover, it is possible to manufacture a rectangular insulated wire having a high space factor in the t-wire portion in a wound state.

However, although the above-mentioned method overcomes the previous drawbacks based on the morphological factors as mentioned above, it does not solve the problem of the flat insulated wire (4 parts) obtained due to the rolling process in the vertical and horizontal directions. The electric wire has a disadvantage in that the electric wire is particularly distorted (the part and the stagnation part), and this distortion deteriorates the insulation properties of the electric wire.

As a result of intensive research to overcome this new drawback, the non-inventor succeeded in developing a method for manufacturing a rectangular insulated wire in which the insulation property of the hooker part is almost the same as that of the flat part, and has made the present invention. This is what led to this.

That is, in the uninvented method, baking of insulating paint is covered with a film and fc
An aluminum-based linear conductor with a circular lfi surface is rolled from the top and bottom and left and right directions to form a roughly ramie shape, and then
When producing a rectangular wire by heat treatment, the rolling ratio in the thickness direction relative to the conductor diameter is within the range of 0.5 to 0.9.
To provide a method for manufacturing a rectangular insulated wire, characterized in that the radius of curvature of a part of the conductor hooker is rolled to a radius of 0.1 to 0.55 times the thickness of the conductor part in the order of conductor part thickness f/2 to f/6. It is something.

The baking of the insulating paint used in the present invention is coated with a film and the aluminum-based linear conductor with a circular cross section includes, for example, polyvinyl formal wire, oil-based enameled wire, polyester wire, polyesterimide wire, polyurethane wire, and polyamideimide wire. , polyimide wire, polyhydantoin wire, etc., but polyvinyl formal wire is preferable from the viewpoint of resistance to deterioration during rolling. In addition, the conductor part K
Aluminum wire rods such as TD electrical aluminum wires and aluminum alloy wires are processed (rolling, rolling, etc.) in the present invention.
In order to obtain a practically satisfactory electric current, t, which does not impede winding operability under conditions (heating), the diameter of the wire is l/i 22~8.fl, preferably lf2.2~ 6 is suitable in view of the rolled strip and f'l= described later.

In the present invention, the above-mentioned baking is performed by forming an aluminum strip-based linear conductor with a circular cross section and covered with a film, for example, using a pair of gluers arranged at predetermined intervals in the horizontal and vertical directions. Using a valve-type tandem rolling machine, C1 is rolled from the top and bottom and from the left and right to form a substantially quadrilateral wire into a rectangular wire. At that time, as for the rolling conditions, if the thickness of the conductor after rolling is too thin, the properties as a rectangular wire will be lost, and if it is too thick, the handling during winding operations etc. will be poor, so the thickness should be 2 to 6 m. It is appropriate that the rolling ratio in the thickness direction to the conductor diameter (the ratio of the thickness of the conductor before and after rolling)
0.5 to 0.9, preferably #f O, 7 to 0.85
, the radius of curvature of a part of the conductor hooker is the thickness of the conductor part DO,1
It is necessary to make it ~0.55 times, preferably 0.2 to 0.4 times. If the rolling ratio is less than 0.5 or the radius of curvature of the conductor hooker is less than 0.1 times the thickness of the conductor part, the withstand voltage will drop significantly due to distortion of a part of the hooker of the obtained rectangular wire, and on the other hand, the rolling ratio is 0.9 or the radius of curvature of a part of the conductor corner exceeds 0.55 times the thickness of the conductor portion, the resulting rectangular wire will have a cross-sectional shape with a low space factor during winding, which is undesirable.

Next, the obtained rectangular wire is subjected to a heat treatment process. This heat treatment 9J softens the conductor portion hardened by the rolling process and
It facilitates the winding operation during fill processing, etc., and the baking of the insulating paint as an insulating layer is done to remove or alleviate the strain caused in the film during the rolling process. As heating conditions, a rectangular wire is introduced into a heating furnace with a Fi of 350 to 450°C, and
A common method is to pass at a speed of 20 m/min and heat for 10 to 60 seconds, but the method is not limited thereto.

In addition, in the present invention, if necessary, ``τ pinholes may be removed or reduced, or the insulating layer may be made thicker to increase withstand voltage, and ``otherwise, as an insulating layer having physical or chemical properties depending on the purpose of use. In order to improve the reliability of the product in terms of insulation, etc., the obtained rectangular wire may be coated with an insulating paint of the same or different type and baked prior to the above heat treatment.

Of course, the baking process can also be combined with the above-mentioned heat treatment.

According to the present invention, it is possible to prevent or alleviate a decrease in the withstand voltage of a part of the hooker due to distortion caused by rolling processing, and it is possible to obtain a rectangular insulated wire in which the withstand voltage of the part of the hooker and the flat part is approximately the same, and Wire can be efficiently wound with low porosity. As a result, the present invention will be explained in further detail by giving a zero-order embodiment in which manufacturing of small-sized and highly reliable electrical equipment becomes possible with 0T performance.

Example Approximately 50 to 60 μm obtained by applying polyvinyl formal varnish 8 times to electrical aluminum wires of 4 diameters and baking them.
A valve-shaped tandem rolling machine made of polyvinyl formal wire having an insulating layer of m and a dielectric breakdown voltage of 9 KV, and combining a total of 4 wires, one pair each in the horizontal and vertical directions. introduced into the device at a speed of 5 m/min,
It was rolled into a substantially quadrilateral rectangular wire by rolling in the vertical and horizontal directions. At that time, the rolling ratio was varied to obtain flat wires with different thicknesses and curvature radii of part of the hooker. The radius of curvature of a part of the four-body hooker can be measured by enlarging the cross section of the obtained rectangular wire 20 times with a projector and comparing it with previously prepared diagrams showing things with various curvature radii. I went.

Next, the obtained rectangular wire was rolled at the same speed as the rolling speed at a temperature of 4.
The wire was introduced into a heating furnace having a temperature of 00° C. and a length of 5 m, and was heated by passing through it to obtain a rectangular insulated wire as the object. Its characteristics are shown in the table. In addition, in Example 4, polyvinyl formal varnish was applied once after the rolling treatment and before the heat treatment. In addition, measurement of dielectric breakdown voltage LfiJIS
The procedure was carried out in accordance with Section 11.2 (metal foil wrapping) of C3003.

On the other hand, a flat insulated wire for comparison was prepared in the same manner and its characteristics were investigated. The results are shown in the table.

(Left below) From the table, it can be seen that when the rolling ratio is less than 0.5 or the radius of curvature of a part of the conductor hooker is less than 0.1 times the thickness of the conductor part, the breakdown voltage decreases significantly due to strain caused by the J@ treatment. Recognize.

Claims (1)

[Claims] 1. Baking of the insulating paint is performed by rolling a film-coated aluminum linear conductor with a circular cross section from the top and bottom and from the left and right to form a substantially quadrilateral shape, and then heating and drying the conductor. When manufacturing flat wire, the rolling ratio in the thickness direction relative to the conductor diameter is 0.
．． The thickness of the C4 body is 2 to 6 silk, and the radius of curvature of the part of the conductor is 0.1 to 0.9 of the thickness of the conductor.
A method for manufacturing a rectangular insulated wire, characterized by rolling the wire by a factor of 0.055. 2. The method according to claim 1, in which a polyvinyl formal wire is used as the insulated aluminum linear conductor.