JPS581518B2 - Densen Nodou Titan Matsunihanda Off-chiyakusuruhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric wire in which the conductor of an electric wire is coated with an insulator made of tetrafluoroethylene resin, which shrinks when heated and has the property of being able to withstand heat at the melting temperature of solder. After immersing the terminal end of the wire in a bath containing flux, the terminal end of the wire with the flux attached is immersed in a bath containing heated solder liquid, and the insulator of the wire end section 1 is removed from the conductor by heat shrinkage and exposed at the same time. This method relates to a method for attaching solder to the conductor terminal of an electric wire, in which solder is attached to the conductor terminal of the electric wire, and the process of removing the insulation from the electric wire terminal and attaching the solder to the conductor terminal can be performed at the same time. It is.

One example of coating a wire conductor with an insulator made of tetrafluoroethylene resin, which shrinks when heated and can withstand heat at the melting temperature of solder, is 0.05 mm%.
A stranded conductor consisting of 51 tin-plated annealed copper wires was wrapped in a spiral with unsintered tetrafluoroethylene resin tape (thickness: 40μ) that had been stretched to 1.5 times its original length.
The outer peripheral surface is stretched to 2.5 times the original length.
Tetrafluoroethylene resin tape sintered at 0 to 350℃ (
(thickness 60μ) is wound in a spiral shape, and the whole is heated at 200 to 250℃, which is below the melting temperature of tetrafluoroethylene resin.
The inner layer of unsintered tetrafluoroethylene resin tape and the outer layer of sintered tetrafluoroethylene resin are heated for a short time to cause heat contraction, and the inner layer is used as a conductor and the outer layer is fixed to the inner layer. The conductor, inner layer, and outer layer are made into one body, and the conductor of the electric wire is made to shrink when heated, and it has the property of being able to withstand heat at the melting temperature of solder (approximately 310°C). coat with another insulator.

Embodiments of the present invention will be described with reference to the drawings. Reference numeral a indicates an electric wire prepared as described above, and reference numeral 1 indicates the conductor 2 thereof, which is an insulator.

B is a flux tank containing an acidic flux such as potassium hydrogen sulfate, a basic flux such as sodium carbonate or potassium hydroxide, or a flux 3 such as pine resin, and C is a flux tank containing 3
This is a solder liquid tank containing solder liquid 4 heated to 10°C.

To carry out the present invention, as shown in FIG. 1, first, 5 mm of the end portion of the electric wire a prepared as described above is immersed in flux 3 in a Franks bath b for about 3 seconds, and the end portion of the electric wire a is coated with flux 3. After adhering, the end portion is immersed in the heated solder liquid 4 in the solder liquid bath C for 10 seconds as shown in FIG.

When the end portion of the electric wire a is immersed in the flux bath b, the flux 3 permeates between the strands of the strands forming the conductor 1 due to capillary action between the strands and activates the metal conductor 1.

Next, when the end of the wire a is immersed in a heated solder bath c, the insulator 2 at the end of the wire a shrinks (3 mm of heat) due to heating, and the insulator 2 at the end of the wire a shrinks by the amount of shrinkage. At the same time as the insulator is removed, the solder liquid 4 adheres to the exposed end of the conductor 1 due to shrinkage of the insulator, and the solder 5 adheres to the end of the conductor 1 of the electric wire a, as shown in FIG.

At this time, the conductor 1 is activated by flux treatment, so that the solder is completely attached, and the insulator 2 has the property of being able to withstand the melting temperature of the solder, so the insulator at the end of the wire is There is no possibility that the solder will melt and cover the surface of the conductor 10, thereby inhibiting solder adhesion.

Conventionally, in order to attach solder to the conductor end of an electric wire, the insulation at the end of the wire is peeled off using a lead cutter, or the insulation at the end is removed by heating and melting. After the conductor is removed, the next step is to immerse the end of the conductor in a solder bath and solder it.This conventional process can damage the conductor during insulation removal or cause uneven surfaces of the area where the insulation has been removed. Therefore, soldering cannot be completed completely, and the process is complicated and requires the time and effort of many people.

In the present invention, the conductor of an electric wire is coated with an insulator made of tetrafluoroethylene resin, which shrinks when heated and has the property of being able to withstand heat at the melting temperature of solder, and the terminal portion of the electric wire is placed in a flux bath. Through a simple process of immersing the wire for a short time and then dipping the terminal end in a heated solder liquid bath for a short time, it is possible to quickly and completely solder the conductor end of the wire without damaging the insulator. In particular, it is effective in making it easier to solder the ends of small-diameter wires.

[Brief explanation of the drawing]

Figure 1 shows the first step of immersing the end of the wire in a flux bath, Figure 2 shows the step of immersing the end of the wire with flux in a heated solder bath, and Figure 3 shows the step of immersing the end of the wire with flux in a heated solder bath. This shows the state in which solder is attached to the conductor terminals. a...Electric wire, 1...Conductor, 2...Insulator, b...
...Flux liquid tank, 3...Flux, C...Solder liquid tank, 4...Heated solder liquid, 5...Solder.

Claims (1)

[Claims] 1 The conductor of the electric wire is coated with an insulator made of tetrafluoroethylene resin that shrinks when heated and has the property of being able to withstand heat at the melting temperature of solder, and the end of the electric wire is immersed in a flux bath and then fluxed. Attaching solder to the conductor end of an electric wire, characterized in that the end of the electric wire to which is attached is immersed in a heated solder liquid bath to remove the insulator at the end of the electric wire and at the same time adhering solder to the end of the conductor. how to.