JPH01128384A - Fusing adhesion method for electric wire - Google Patents

Abstract

PURPOSE:To secure a solid adhesion electrically and mechanically by inserting and pressing a wire between connection pieces opposing each other, and radiating a pulse-form laser beam. CONSTITUTION:An electric wire 2 is inserted between connection pieces 1 which are formed in U-shape section opposing each other, and the connection pieces 1 are pressed by a compressor to connect to the wire 2. In such a composition, a pulse-form laser beam 6 whose energy is set in a value to make the materials into a fused condition in a short time is radiated to the end of the wire 2 and to the end edges of the connection pieces 1 near the end of the wire 2. Thereby, the end of the wire 2 is made into a fused area 2a being expanded into a spherical form by the surface tension, attached to the fused area 1a of the connection pieces 1 presenting a connecting condition electrically, and connected also mechanically even after the pressure is removed. In such a way, a rigid adhesion can be secured.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for welding electric wires using a laser beam as a heat source.

In contrast to conventional terminals, wires are usually crimped, crimped, soldered,
Connected by spot welding, etc.

It is obvious that spot welding, which directly connects materials, is better from the viewpoint of electrical properties alone, but spot welding requires mechanical pressure, which can crush the wires, reduce mechanical strength, and It is not used much due to equipment workability etc.

In addition, soldering has good electrical properties next to spot welding, but the mechanical strength decreases due to hardening of the wire due to heat, etc.
In particular, it is inferior in bending and vibration resistance, and in addition, there are many problems such as workability, reliability during processing, and working environment.

Although the electrical properties of crimping are somewhat inferior to the former, it is widely used because it is the most advantageous overall in terms of mechanical properties, workability, reliability, etc. However, since a considerable amount of force is required for crimping, there is a limit to the miniaturization of equipment, and it is particularly unsuitable for continuous processing of connectors.

Further, although crimping is optimal for continuous processing of connectors, it is used in specific fields because of its narrow range of conditions, low mechanical strength, and poor reliability.

As described above, the conventional general connection method has problems in terms of mechanical strength, work efficiency, reliability, etc.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to ensure sufficient mechanical strength at the connection portion while maintaining good electrical connection, and to improve the workability of the connection.

Solution to the Invention Therefore, the present invention focuses on a pulsed laser beam among various heat sources, and irradiates a pulsed laser beam with high energy density for a short period of time to connect one pair of two members to be connected. The connecting piece is ready for connection, and the electric wire is instantly melted to connect the two electrically and mechanically in a strong state, and the bulging shape of the electric wire at the welded part allows it to be securely inserted between the connecting pieces. It is made so that it can be set to a stopped state.

According to this connection method, the energy required for welding is irradiated intensively to the welded part in a short time, so almost no energy is transmitted to the outside, and it is also suitable for non-ferrous metals, especially copper wire and copper alloy terminals. A good connection status can be obtained.

Structure and operation of the invention FIGS. 1 and 2 show each step of the welding method of the invention.

Of the pair of connection pieces 1 and electric wires 2 to be connected, the connection piece 1 is a part of the terminal 3 and has a U-shaped cross section and is formed in an opposing state, and is placed on a jig 4 or the like in a positioned state. On the other hand, the electric wire 2 is supplied between the facing connection pieces 1 by an automatic machine or the like.

At this time, since the electric wire 2 is inserted between the facing connection pieces 1 while forming a sufficient space, the electric wire 2 can be inserted relatively easily. In this state, the end of the electric wire 2 is set to slightly protrude from the edge of one of the connecting pieces 1.

After that, since the pressing body 5 presses one of the facing connection pieces 1 with the jig 4, the internal electric wire 2 is sandwiched between the facing connection pieces I, and their surfaces come into contact with. In this state, the end of the electric wire 2 and the edge of the connecting piece 1 near this end are irradiated with the pulsed laser beam 6. The energy of this pulsed laser beam 6 is set to a value that melts the material of the connecting piece l and the wire 2 in a short time, and intensively heats the end of the wire 2.
While bringing it into a molten state, the nearby connecting piece 1 is simultaneously heated to prepare it for welding. As a result, the end of the electric wire 2 becomes molten and ready to be welded to the surface of the connecting piece l. Of course, during this time, the edge of the connecting piece 1 is thermally changed by the heating of the pulsed laser beam 6, becoming a melted region 1a, which is in a state where it easily adheres to the end of the molten electric wire 2. There is. As a result, as shown in FIG. 3, the molten electric wire 2a swells into a spherical shape at its end due to surface tension, adheres to the molten region 1a at the end of the connection piece 1, and is electrically connected. Become.

Therefore, even if the pressing body 5 is separated from the connecting piece 1 after this, the opposing connecting piece 1 remains fixed with the electric wire 2 sandwiched therebetween.

In this example, the cross section of the connecting piece 1 was obtained at the edge of the connecting piece 1 and the end of the electric wire 2, but the cross section of the connecting piece 1 can be obtained not only at the edge but also by drilling a hole in the middle. , also electric
It goes without saying that the same effect can be obtained not only at the ends but also at the middle of 1IA2.

Effect of the invention The present invention provides the following effects.

When inserting an electric wire, since the facing connection pieces form a space necessary for insertion of the electric wire, the electric wire can be easily inserted even if the electric wire is not positioned accurately.

During irradiation with the pulsed laser beam, the pair of connection pieces are in contact with the wire, so the energy of the pulsed laser beam is efficiently (transmitted) to the connection pieces and the end of the wire, and The connected parts are heated evenly.

Since the pulsed laser beam is pulsed and intensively irradiated on the connection part with the high energy necessary to melt the conductive material in a short period of time, the material at the connection part instantly melts, causing the area to melt. The heat is not transferred to other parts by thermal conduction of the material, so even if there are thermally weak materials or semiconductor elements nearby, welding can be performed without adversely affecting them.

Since the pulsed laser beam is irradiated to the connecting piece and the end of the wire, both the upper and lower connecting pieces are heated by the laser beam, forming a melting area, and the end of the wire is in a molten state. , it bulges out into a spherical shape and has a shape that prevents the wire from being pulled out with respect to the connecting pieces that are facing each other, so that the electric wire is definitely prevented from being pulled out between the two connecting pieces, and it is electrically connected over a large area. Therefore, the electrical connection state becomes stable.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the connecting piece and electric wire to be connected, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view of the connecting portion. 1. Connection piece, 2. Electric wire, 3. Terminal, 4. Jig.
5. Pressing body, 6. Pulsed laser beam. Patent Applicant: General Engineering Co., Ltd. (Figure 7, Figure 2, Figure 3, Procedural Owner's Official Signature) December 8, 1988 Patent Application No. 285165 2, Title of Invention: Welding of electric wires Method 3: Relationship with the case of the person making the amendment Patent application Colonel Address: 1-3-206 Takahamadai, Hiratsuka City, Kanagawa Prefecture Name: General Engineering Co., Ltd. Representative Iwa
1) Address: 2-4-1 Hamamatsucho, Minato-ku, Tokyo Name: Nippei Toyama Co., Ltd. Representative: Katsuin Matsumoto 4, Agent 8160 6, Subject of amendment: Detailed explanation of the invention in the specification 7,
Contents of the amendment (1) “Equipment workability” on page 2, line 2 of the specification has been changed to “equipment,
I am corrected by saying,

Claims (1)

[Claims] Insert the wire between the opposing connection pieces, and then press one connection piece against the other connection side to connect the two wires.
A method for welding an electric wire, which comprises sandwiching the wire between two connecting pieces, heating the electric wire and a cross section of the connecting piece simultaneously with a laser beam in this state, and melting the electric wire and welding it to the opposing connecting piece.