JPH08118033A - Joining method of stranded electric wire - Google Patents

Abstract

PURPOSE: To provide the joining method of a stranded electric wire capable of preventing a wire stock from buckling/bulging, preventing joined part from lowering of mechanical strength and increasing of electric resistance and obtaining suitable joined part by resistance welding. CONSTITUTION: When ends of two stranded electric wires 1, in which plural wire stocks 2 are stranded, are butted and connected by resistance welding, an insert member 3, which is made of the same material as the wire stock 2 and is provided with wire stock inserting holes 4 at both ends, is inserted between butting end parts of both electric wires and is subjected to resistance welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting twisted wires.

[0002]

2. Description of the Related Art When abutting the ends of a relatively thick stranded wire electric wire in which a plurality of wires are twisted together and connecting them by resistance welding, as shown in the longitudinal sectional view of FIG. The wires 2 are directly abutted against each other, and current is applied to these wires while pressurizing them, and the connection portions are connected by heating and pressure contact by resistance heating.
However, in such a method, as shown in the vertical sectional view of FIG. 6, the strand 2 may buckle and open like an umbrella during the pressing process, and as shown in the vertical sectional view of FIG. Even if it happens, both strands 2 may have a stagger 13 at the joint surface, and there is a dislike that the mechanical strength of the connection portion is lowered and the electrical resistance is increased.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and it is possible to prevent the wires from buckling like an umbrella and opening, and at the same time, to connect the connecting parts due to the misalignment of the wires. It is possible to prevent the decrease of mechanical strength and the increase of electric resistance of
An object of the present invention is to provide a method for connecting a twisted wire and an electric wire, which can obtain an appropriate connection portion by resistance welding.

[0004]

To this end, the present invention is designed to butt end portions of a stranded wire electric wire in which a plurality of strands are twisted together and to connect them by resistance welding. It is characterized in that resistance welding is performed by interposing an insert member made of the same material as the wire and having wire insertion holes on both sides.

[0005]

In the method for connecting a stranded wire and an electric wire according to the present invention, resistance welding is performed by interposing an insert member having the same material as the wire and having wire insertion holes on both sides between the butt ends of both wires. This prevents the strand from buckling and opening like an umbrella during the pressing process. Further, by butt-connecting both electric wires through such an insert member, the discrepancy of the connecting portion is eliminated, and the decrease in mechanical strength and the increase in electric resistance are prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a method for connecting a stranded wire according to the present invention will be described. FIG. 1 is a longitudinal sectional view of a joint before connection of the first embodiment, and FIG. 2 is a joint before connection of the second embodiment. FIG. 3 is a vertical sectional view of the post-connection joint, and FIG. 4 is a schematic view of a resistance welding apparatus for carrying out the present method. First, in FIG. 1 of the first embodiment, between the butt ends of a relatively thick electric wire 1 composed of a plurality of wires 2 and having a cross-sectional area of about 100 mm ² , the same material as the wires 2 is provided on both sides. An insert member 3 provided with a wire insertion hole 4 having a depth of about 3 mm is interposed. The gap between the bottoms of the holes 4 of the insert member 3 is about twice the diameter of the wire 2.

In resistance welding between the end portions of the electric wire 1 having the insert member 3 interposed therein, as shown in FIG. 4, the end portion of the wire 2 is inserted into the wire insertion hole 4 of the insert member 3. In a state where the wire 2 is inserted and held by the grip portion 8 while applying a pressing force 10 to the tip end surface of the wire 2 by the pressurizing mechanism 9,
A current 12 is supplied from the welding power source 11 to heat and connect. Then, since the tip of the wire 2 is housed in the wire insertion hole 4 of the insert member 3, it does not buckle and open like an umbrella in the pressurizing process, and the tips of the wire 2 are different from each other in the insert member 3. Since they are opposed to each other via the central thick portion, there is no discrepancy, which would not cause a decrease in mechanical strength and an increase in electrical resistance of the connection portion, and a proper connection portion can be obtained.

In FIG. 2 of the second embodiment, a copper braze 6 having a low melting point and a low electric resistance is previously brazed to the bottom 5 of the wire insertion hole 4 of the insert member 3. The center thick portion of the insert member 3 is set to about 7 mm in consideration of the amount of upset during resistance welding. However, in this case, when resistance welding is performed between the ends of the electric wire 1 with the insert member 3 interposed by a method as shown in FIG. 4, buckling, deterioration of mechanical strength, and reduction of mechanical strength are caused as in the first embodiment. It is possible to prevent an increase in electric resistance, and as shown in FIG. 3, a brazing impregnation 7 is formed in the gap between the wire 2 and the insert member 3 and the gap between the wire 2 so that the electrical conductivity, A joint with excellent strength can be obtained. In addition, the low melting point wax enables resistance welding with stable joint quality.

[0009]

In summary, according to the present invention, when the end portions of the twisted wire electric wires in which a plurality of strands are twisted together are butted and connected by resistance welding, the strands of wire are put between the butted ends of both electric wires. By resistance welding by inserting an insert member that has wire insertion holes on both sides, it is possible to prevent the wires from buckling like an umbrella and opening, and at the machine of the connecting part due to misalignment of the wires. Industrial Applicability The present invention is extremely useful industrially, because a method for connecting a stranded wire and an electric wire can be obtained which can prevent a decrease in mechanical strength and an increase in electric resistance and can obtain an appropriate connection portion by resistance welding.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a joint before connection in a first embodiment of a method for connecting a stranded wire according to the present invention.

FIG. 2 is a vertical cross-sectional view of a joint before connection according to a second embodiment.

FIG. 3 is a vertical cross-sectional view of the post-connection joint of the above.

FIG. 4 is a schematic diagram of a resistance welding apparatus for carrying out the present method.

FIG. 5 is a vertical sectional view of a joint before connection in a conventional method.

FIG. 6 is a vertical sectional view showing a problem of the conventional method.

FIG. 7 is another vertical sectional view of the above.

[Explanation of symbols] 1 electric wire 2 elemental wire 3 insert member 4 elemental wire insertion hole 5 bottom 6 copper brazing 7 brazing impregnation

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Hayashigashi Koichi Hayashikashi 1-1-1, Wadazakicho, Hyogo-ku, Kobe Sanryo Heavy Industries Ltd. Kobe Shipyard (72) Inventor Seiichi Kageyama Soraku Kizu-cho, Soraku-gun, Kyoto Prefecture 3-1-1, Kindai Kyoto Research Institute, Ltd. (72) Inventor Takashi Fujita 3-1-1, Sorakudai Kizu-cho, Soraku-gun, Kyoto Pref.Kinden Kyoto Research Institute, Ltd.

Claims (2)

[Claims] 1. When abutting the ends of a stranded wire electric wire in which a plurality of wires are twisted together and connecting them by resistance welding, a wire is inserted between the abutting ends of both electric wires with the same material as the wire. A method of connecting a twisted wire according to claim 1, wherein resistance welding is performed by interposing an insert member having a hole. 2. The method for connecting a stranded wire according to claim 1, wherein a low melting point and low electric resistance material is brazed in advance to the bottoms of the wire insertion holes on both sides of the insert member.