JPS6310485A - Terminal processing for enamelled 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 [Technical Field of the Invention] The present invention relates to a method for treating the end of an enameled wire, and particularly to a method for removing a ruptured membrane at the end suitable for a thin enameled wire.

[Technical Background of the Invention 1 When connecting an insulated wire with an enamel coating to equipment, it is necessary to remove the coating at the end of the wire. Since soldering is poor, the following method is generally used to remove the film from the terminal part.

Namely, ■Mechanical peeling method: Mechanically peeling off the coating using a knife or sandblasting, etc., ■Chemical removal method: Methylene chloride/formic acid or alkaline solution or melting. A method of dissolving and removing the coating using an alkali or the like, and (2) Thermal coating removal method: A method of heating with a gas burner or the like to thermally decompose the coating and remove it.

[Problems with the background art] However, in removing the film by the above method,
In particular, heat-resistant enameled wires made of polyimide 1fM #1, amide-imide resin, 8-type ester imide resin, etc., or ultra-fine wires such as aluminum conductor enameled wires have the following problems, and it is extremely difficult or impossible to remove the coating. there were. That is, in the method (2) above, since the conductor strength of the l1lIl wire is low, it is difficult to peel off only the coating without cutting the conductor. In addition, in Method 6, there is no solvent suitable for dissolving the coating, and in the case of aluminum conductors, it is difficult to use chemical removal methods because they react with acids and alkalis, and in the case of Litz wires, capillary This phenomenon causes the solution to rise above the area from which the coating is to be removed, causing the problem that the coating is removed over a longer length than necessary. In method (2), since the heat capacity of the conductor is small, the conductor itself melts and it is impossible to thermally decompose only the coating.

[Object of the invention] The present invention has been made to solve the above-mentioned difficulties.
Ill of heat-resistant enameled wire and aluminum conductor enameled wire! The purpose is to provide a method that can easily perform terminal processing.

[Summary of the Invention] The method for treating the end of an enameled wire according to the present invention is to surround the outer periphery of the end of an insulated wire having an enamel coating with a ferromagnetic material, and heat the ferromagnetic material by induction, thereby treating the end of the enameled wire. This makes it possible to quickly and easily remove the coating at the terminal of the wire.

In the present invention, the heating temperature is controlled by the cue point of the ferromagnetic material, and the ferromagnetic material is heated by induction to reach a predetermined temperature within a short time of about 1 to 10 seconds and maintain that temperature. . The set temperature can be set arbitrarily by changing the composition of the ferromagnetic material. For example, heat-resistant enameled wire is heated to 600 to 1000°C, and aluminum conductor enamelled wire is heated to a range of 500 to 650°C. Ru.

Furthermore, it is efficient for the enamel coating to come into contact with a heated ferromagnetic material, and for this reason it is preferable to use a thin film of ferromagnetic material.

The present invention is particularly suitable for removing coatings from the ends of solid wires and litz wires having an outer diameter of 0.5z#+φ or less.

[Embodiment of the invention] The end of an enameled wire having a polyimide rfFi coating with an exception diameter of 0.1 uφ was made of pyrofoil F920 (ferromagnetic thin film manufactured by Nippon Analytical Industry Co., Ltd., trade name: thickness 0.05 mm, thermal decomposition temperature 920 mm). ℃) and heat the terminal in an induction heating oven for 10 s.
By heating with EC, the coating on the terminal portion was completely removed.

The frequency of the above induction heating furnace is 450K)-1z, and the high frequency output is 150W.

Comparative Example An attempt was made to heat the enamelled wire used in the example with a gas burner to thermally decompose the coating, but this was impossible because the conductor melted.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to quickly and completely remove the coating at the end of an enameled wire, and in particular, it is possible to remove the coating at the end of an enameled wire, and it is particularly possible to remove the coating at the end of an enameled wire. Line pole 1! It has the advantage of making it possible to easily process the terminals of II wires and Litz wires.

Claims (1)

[Claims] 1. An enameled wire characterized in that the outer periphery of the end of an insulated wire having an enamel coating is surrounded by a ferromagnetic material, and the enamel coating at the end is removed by induction heating the ferromagnetic material. Terminal processing method. 2. The enamelled wire end treatment method according to claim 1, wherein the ferromagnetic material is a thin film. 3. The method for terminal treatment of an enameled wire according to claim 1 or 2, wherein the outer diameter of the insulated wire is 0.5 mmφ or less.