JPH08213140A - Method and device for thermo compression bonding of wire - Google Patents

Abstract

PURPOSE: To provide a method and a device for thermo compression bonding of wires, which can thermo-compression bonding wires without projecting the end of a conductor and without lowering efficiency at the time of thermo compression bonding plural wires. CONSTITUTION: A thermo-compression bonding device 10 for a wire is provided with a positioning means 30. The positioning means 30 positions the end of a conductor between a lower side electrode 12 and an upper side electrode 20. Consequently, the end of the conductor is not projected from the conductor, which is thermo-compression bonded by the lower side electrode 12 and the upper side electrode 20. Even in the case where plural thermo-compression bonded conductors are wound with the insulating tape, since the insulating tape is not broken, the conductors can be perfectly insulated by the insulating tape. The end of the conductor can be easily positioned between the lower side electrode 12 and the upper side electrode 20 without lowering efficiency by using the positioning means 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire thermocompression bonding method and device, and more particularly to an electric wire thermocompression bonding method and device which is applied to a branch portion of a wire harness and which thermocompresses conductor portions of a plurality of electric wires.

[0002]

2. Description of the Related Art Conventionally, when connecting a plurality of electric wires such as a branch portion of a wire harness, the insulating coating of each electric wire is removed to expose the conductors, and the exposed conductors are resistance-welded. Thermocompression bonding is carried out by a thermocompression bonding apparatus utilizing (see, for example, JP-A-6-132041). When the conductors of a plurality of electric wires are thermocompression-bonded to each other with this thermocompression bonding apparatus, first, as shown in FIG.
The conductor portions 1a, 2a, 3a from which the insulating coating is removed are sandwiched while being pressed by the lower electrode 4 and the upper electrode 5.
Next, the lower electrode 4 and the upper electrode 5 are energized. As a result, as shown in FIG. 12, the conductor portions 1a, 2a, 3a ... Are thermocompression-bonded to each other by the pressing force of the lower electrode 4 and the upper electrode 5 and the heat generated in the conductor portions 1a, 2a, 3a. Then, as shown in FIG. 13, the conductor portions 1a and 2 thermocompression-bonded to each other.
The insulation tape 6 is wound with a, 3a ...

[0003]

However, in the conventional thermocompression bonding method, the conductor 3a may be thermocompression bonded with the end 3b of the conductor 3a protruding from the lower electrode 4 (see FIG. 11). , 2a, 3a, ... Ends 3b project from the thermocompression-bonded portions (see FIG. 12). For this reason,
As shown in FIG. 3, the end portion 3b may break through the insulating tape 6, and as shown in FIG. 14, the end portion 3b may come into contact with the body or the like of the automobile 7.

On the other hand, although it is possible to position the conductor portions 1a, 2a, 3a ... In such a manner that the end portion 3b does not project from the lower electrode 4 in the thermocompression bonding process by the operator's eyes, this is possible. The method has a problem that workability is reduced. Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, and to perform a thermocompression bonding method for an electric wire, which enables thermocompression bonding of a plurality of conductor parts without lowering workability and without protruding the ends of the conductor parts. And to provide a device.

[0005]

The above object of the present invention is achieved by the following constitution. (1) The insulating coating portions of the plurality of electric wires are peeled off to expose the respective conductor portions, and the respective conductor portions are sandwiched by a pair of electrodes and an electric current is applied between the pair of electrodes to separate the conductor portions. A thermocompression bonding method for an electric wire to be thermocompression bonded, characterized in that an end portion of the conductor portion is positioned between the pair of electrodes by a positioning means.

(2) The positioning means includes a stopper, and a tip portion of the stopper is disposed between the pair of electrodes,
The thermocompression bonding method for an electric wire according to (1), characterized in that the end of the conductor is brought into contact with the tip of the stopper to position the end of the conductor between the pair of electrodes. .

(3) The tip end portion of the stopper abuts the tip end portion of the conductor portion at a position lower than the height of the conductor portions sandwiched by the pair of electrodes. The thermocompression bonding method of the electric wire described in ().

(4) The insulating coating portions of the plurality of electric wires are peeled off to expose the respective conductor portions, and the respective conductor portions are clamped by a pair of electrodes, and an electric current is applied between the pair of electrodes so that each of the conductor portions is electrically connected. An electric wire thermocompression bonding apparatus for thermocompression bonding a conductor portion, comprising: positioning means for positioning an end of the conductor portion between the pair of electrodes.

(5) The positioning means includes a stopper having a tip portion that can be arranged between the pair of electrodes, and the tip portion of the stopper is brought into contact with the end portion of the conductor portion to fix the end portion of the conductor portion. The electric wire thermocompression bonding apparatus according to (4), characterized in that positioning is performed between the pair of electrodes.

(6) The height of the tip portion of the stopper is lower than the height of the plurality of conductor portions sandwiched by the pair of electrodes. .

(7) The wire thermocompression bonding apparatus according to (6), wherein the tip of the stopper is formed of a member having a high resistance and a high melting point such as a tungsten alloy.

[0012]

According to the present invention, the insulating coating portions of a plurality of electric wires are peeled off to expose the respective conductor portions, the exposed plurality of conductor portions are pinched by a pair of electrodes, and at the same time an electric current is applied between the pair of electrodes. In an electric wire thermocompression bonding apparatus for thermocompression-bonding a plurality of conductor portions with each other, the electric wire thermocompression bonding apparatus includes positioning means, and the positioning means positions the end portion of the conductor portion between the pair of electrodes. Therefore, the end portions of the conductor portion do not protrude from the plurality of conductor portions thermocompression bonded by the pair of electrodes.

Further, according to the present invention, the positioning means includes a stopper, the tip end portion of the stopper is disposed between the pair of electrodes, and the end portion of the conductor portion is brought into contact with the tip end portion of the stopper so as to contact the conductor portion. Positioning the end between the pair of electrodes. Therefore, the end portion of the conductor portion can be easily positioned between the pair of electrodes.

Further, according to the present invention, the height of the tip of the stopper is set lower than the height of the plurality of conductors. Therefore, when pinching the plurality of conductor portions, the pair of electrodes do not come into contact with each other, so that the plurality of conductor portions positioned between the pair of electrodes can be pinched by the pair of electrodes to a desired pressing force. it can.

Further, according to the present invention, the tip portion of the stopper is formed of a member having a high resistance and a high melting point such as a tungsten alloy. Therefore, it is possible to sufficiently heat the plurality of conductor portions when electricity is applied between the pair of electrodes.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric wire thermocompression bonding method and apparatus according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the thermocompression bonding apparatus 10 for electric wires includes a lower electrode 12 and an upper electrode 2.
0 and positioning means 30. The lower electrode 12 is formed of a metal having a high resistance and a high melting point, for example, a material such as tungsten alloy, molybdenum, tantalum, etc., in a flat plate shape, and a lower pressing portion 12a is projected at the center of the upper end portion. Both ends of the lower pressing portion 12a are tapered. The lower electrode 12 is attached to the lower base 13.

That is, a support base 14 is provided on the left side of the lower base 13, and an inner guide 15 and an outer guide 16 are erected parallel to each other on the support base 14 at regular intervals. The lower electrode 12 is fixed while being fitted between the inner guide 15 and the outer guide 16. In this case, the lower pressing portion 12a of the lower electrode 12 is located between the inner guide 15 and the outer guide 16, and the lower pressing portion 12a, the inner guide 15 and the outer guide 16 are conductor portions 40a and 41a described later. , 42a ... Are arranged to form recesses. The upper portion of the outer guide 16 is cut away in FIG.

Similar to the lower electrode 12, the upper electrode 20 is made of a material such as tungsten alloy, molybdenum, tantalum or the like and formed in a flat plate shape. The upper electrode 20 has an upper pressing portion 20a protruding downward at the center of the lower end. Further, both side portions of the upper pressing portion 20a are formed in a tapered shape. The upper electrode 20 is attached to the upper base 21 in a state where the upper pressing portion 20a is arranged so as to face the lower pressing portion 12a of the lower electrode 12. The upper base 21 is supported by a thermocompression bonding apparatus body (not shown) so as to be able to move up and down. Then, when the upper base 21 is lowered, the upper pressing portion 20 is fitted between the inner guide 15 and the outer guide 16 together with the upper electrode 20.

The positioning means 30 has a case 31, a stopper guide 32 and a stopper 33. Case 3
1 is disposed so as to face the lower base 13, and a stopper guide 32 is fixed to the side surface of the case 31 so as to project toward the lower base 13. The stopper guide 32 is formed in a rectangular box shape, and a stopper 33 is movably supported in the stopper guide 32.

That is, as shown in FIG.
On the upper and lower surfaces of the base end of the slide portion 34,
35 is formed, and the slide portions 34 and 35 are movably contacted with the upper surface and the bottom surface of the stopper guide 32, respectively. Further, as shown in FIG. 3, a guide groove 39 is formed in a substantially L shape at the bottom of the stopper guide 32. A protrusion 36 (see FIGS. 4 and 5) is movably fitted in the guide groove 39, and the protrusion 36 is formed on the lower surface of the slide portion 35. As a result, the stopper 33 moves in the direction of the arrow AB in the stopper guide 32 while being kept horizontal by the stopper guide 32. When the stopper 33 is positioned at the tip of the stopper guide 32, the stopper 33 moves in the direction of arrow CD.

In the tip of the stopper guide 32, the protruding piece 3
7 is formed, and a coil spring 38 is attached to the projecting piece 37. The coil spring 38 is maintained in a compressed state by a compressing means (not shown), and when the compressed state by the compressing means is released, the coil spring 38 is expanded by a biasing force. Therefore, the stopper 33
Is located at the tip of the stopper guide 32, the coil spring 38 is released by releasing the compression state by the compression means.
The biasing force moves the stopper 33 in the direction in which it projects from the stopper guide 32 (direction of arrow D). In this case, the front end of each of the slide portions 34 and 35 has a stopper guide 3
The stopper 33 stops by contacting the second bent portions 32a, 32a.

The tip of the stopper 33 has the upper electrode 1
2 and lower electrode 20, they are made of a tungsten alloy or the like, or they are made of ceramic. Therefore, when electricity is applied between the upper electrode 12 and the lower electrode 20, the conductor portions 40a, 41a, 42a, which will be described later, can be sufficiently heated. Thereby, the conductor portion 40a,
It is possible to surely thermally compress the parts 41a, 42a ... And improve the quality.

A step portion 33a is formed at the tip of the stopper 33. The step portion 33a is located above the lower pressing portion 12a when the stopper 33 projects from the stopper guide 32 by the urging force of the coil spring 38 (see FIG. 2). The height h of the step portion 33a (see FIG. 6) is set by the following equation. h <s / w where s: total cross-sectional area (w × H) of the conductor portions 40a, 41a, 42a ... Of the electric wires 40, 41, 42, ... Which are thermocompression bonded (see FIG. 7) w: of the lower electrode 12 Width of lower pressing portion 12a (see FIG. 7)

In this case, as shown in FIG. 7, the plurality of conductor portions 40a, 41a, 42a, ... Are bundled so that the entire cross section is rectangular, and the width of the rectangular shape is the lower side pressure of the lower electrode 12. It is assumed that the width is the same as the width w of the portion 12a. Therefore, the height h of the step portion 33a is lower than the height of the conductor portions 40a, 41a, 42a, ... Bundled for thermocompression bonding. As a result, when the conductor portions 40a, 41a, 42a ... Are squeezed between the lower pressing portion 12a and the upper pressing portion 20a,
The upper pressing portion 20a does not contact the step portion 33a of the stopper 33.

As shown in FIG. 1, the case 31 has holder portions 31a, 31b ... Formed below the stopper guide 32, and a plurality of holder portions 31a, 31b ... Have different heights h (see FIG. 6). Exchange stoppers 33, 33 ... Are housed respectively.

Next, the operation of the thermocompression bonding apparatus for electric wires according to the present invention constructed as described above will be described. First, the stopper 3
3 is moved in the direction of the tip of the stopper guide 32 (direction of arrow B). Then, when the stopper 33 reaches the tip of the stopper guide 32 (see FIG. 3), the compression state by the compression means is released and the coil spring 38 is extended. As a result, the biasing force of the coil spring 38 moves the stopper 33 from the position shown in FIG. 4 in a direction projecting from the stopper guide 32 (direction of arrow D). Then, the slide parts 34, 35
The front end of the bent portion 32a of the stopper guide 32, 32a
And the stopper 33 stops at the position shown in FIG.

In this case, the step portion 33a formed at the tip of the stopper 33 is located above the lower pressing portion 12a of the side electrode 12. Next, the conductor portions 40a, 41a, 42a, ... From which the insulating coatings of the electric wires 40, 41, 42 ... Are removed are bundled and arranged in the recess formed by the lower pressing portion 12a, the inner guide 15 and the outer guide 16. (See FIG. 7). In this case, as shown in FIG. 6, the end portion 42b of the conductor portion 42a of the electric wire 42 is brought into contact with the tip of the step portion 33a. This allows
The end portion 42b of the conductor portion 42a is positioned so as not to project from the lower pressing portion 12a of the lower electrode 12.

Next, the upper base 21 is lowered to fit the upper electrode 20 between the inner guide 15 and the outer guide 16, and the conductor portions 40a, 41a, 42a arranged in the recesses are arranged.
Is clamped by the lower pressing portion 12a and the upper pressing portion 20a (see FIG. 6). Then, the lower electrode 12 and the upper electrode 20 are energized. As a result, the conductor portions 40a, 41a,
42a ... Generates heat in the conductor portions 40a, 41a, 42a.
Are thermocompression bonded (see FIG. 8).

In this case, the end portion 42b of the conductor portion 42a of the electric wire 42 is brought into contact with the tip of the step portion 33a of the stopper 33 so as not to project from the lower pressing portion 12a of the lower electrode 12. End portion 42b of the portion 42a (see FIG. 6)
Does not protrude from the conductor parts 40a, 41a, 42a ... Therefore, the thermocompression-bonded conductor portions 40a, 4
When the 1a, 42a, ... Are wrapped around the insulating tape, the insulating tape is not pierced at the end portion 42b.

Further, by using the stopper 33, the end portion 42b of the conductor portion 42a can be easily positioned so as not to project from the lower pressing portion 12a of the lower electrode 12. Therefore, it is possible to prevent the workability of the thermocompression bonding process from being deteriorated.

In the above embodiment, the case where the intermediate conductor portions 40a, 41a ... Of the electric wires 40, 41 ... And the end portion 42a of the electric wire 42 is thermocompression bonded has been described, but the present invention is not limited to this, and FIG.
It is also possible to thermocompress the ends of the electric wires 50, 51, 52 ... As shown in FIG. Hereinafter, another embodiment in which the end portions of the electric wires 50, 51, 52, ... Are thermocompression bonded will be described with reference to FIGS. Note that, in FIG. 10, the same members as those of the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. First, the step portion 33a formed at the tip portion of the stopper 33 is arranged above the lower pressing portion 12a of the lower electrode 12 as in the above embodiment (see FIG. 10).

Next, the conductor portions 50a, 51a, 52a, ... From which the insulating coating on the end portions of the electric wires 50, 51, 52 ... Are removed, are bundled to align the respective end portions (see FIG. 9). Next, the conductor portions 50a, 51 whose ends are aligned
are arranged in the recess formed by the lower pressing portion 12a of the lower electrode 12, the inner guide 15 and the outer guide 16 as in the above embodiment. In this case, as shown in FIG. 10, the end portion 52b of the lowermost conductor portion 52a is connected to the step portion 33a.
Abut the tip of. Thereby, the conductor portions 50a, 51
The end portions of a, 52a, ... Are arranged so as not to project from the lower pressing portion 12a of the lower electrode 12.

Then, similarly to the above-described embodiment, the upper base 2
1 is lowered to fit the upper electrode 20 between the inner guide 15 and the outer guide 16, and the conductor portions 50a, 51a, 52a disposed in the recess are connected to the lower pressing portion 12a and the upper pressing portion 20a. It pinches with (refer to Figure 10). Then, the lower electrode 12 and the upper electrode 20 are energized. As a result, the conductor portions 50a, 51a, 52a ... Are thermocompression-bonded to each other by the heat generated in the conductor portions 50a, 51a, 52a.

In this case, the end portion 52b of the conductor portion 52a is brought into contact with the tip of the step portion 33a of the stopper 33 so that the conductor portions 50a, 51a, 52a ... Do not protrude from the lower pressing portion 12a of the lower electrode 12. It was arranged as follows. Therefore, the respective ends of the conductor portions 50a, 51a, 52a ... Do not project from the thermocompression-bonded conductor portions 50a, 51a, 52a.

In each of the above embodiments, when the coil spring 38 is attached to the protrusion 37 of the stopper guide 32 and the stopper 33 is positioned at the tip of the stopper guide 32,
The case where the stopper 33 is moved in the direction of protruding from the stopper guide 32 by the urging force of the coil spring 38 has been described, but the invention is not limited to this.
The coil spring 38 to the stopper 33.
Even if it moves together with it, the same effect as that of the above-described embodiment can be obtained.

[0036]

As is apparent from the above description, according to the method and apparatus for thermocompression bonding of electric wires according to the present invention, the end portion of the conductor portion is positioned between the pair of electrodes by the positioning means. The ends of the conductors do not project from the plurality of conductors thermocompressed with each other. Therefore, it is possible to completely insulate the plurality of conductor portions without breaking through the insulating tape wound around the plurality of thermocompression-bonded conductor portions at the ends of the protruding conductor portions. Further, by using the positioning means, the end portion of the conductor portion can be easily positioned between the pair of electrodes without lowering workability.

Further, according to the present invention, the positioning means is provided with a stopper, the tip of the stopper is arranged between the pair of electrodes, and the tip of the conductor is brought into contact with the tip of the conductor so that the conductor is Positioning the end between the pair of electrodes. Therefore, the end portion of the conductor portion can be easily positioned between the pair of electrodes, so that the workability can be prevented from being deteriorated.

Furthermore, according to the present invention, the height of the tip of the stopper is set lower than the height of the plurality of conductors. Therefore, when the plurality of conductor portions are clamped, the pair of electrodes do not contact each other, so that the plurality of conductor portions positioned between the pair of electrodes can be clamped with a desired pressing force. As a result, the plurality of conductor portions can be surely thermally compressed, so that the quality can be improved.

Further, according to the present invention, the tip portion of the stopper is formed of a member having a high resistance and a high melting point such as a tungsten alloy. Therefore, it is possible to sufficiently heat the plurality of conductor portions when electricity is applied between the pair of electrodes. As a result, the plurality of conductor portions can be surely thermally compressed, so that the quality can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a thermocompression bonding apparatus for electric wires according to the present invention.

FIG. 2 is a perspective view showing a positioning means used in the thermocompression bonding apparatus for electric wires according to the present invention.

FIG. 3 is a plan view showing a positioning means used in the thermocompression bonding apparatus for electric wires according to the present invention.

FIG. 4 is a cross-sectional view illustrating the operation of the positioning means used in the wire thermocompression bonding apparatus according to the present invention.

FIG. 5 is a cross-sectional view illustrating the operation of the positioning means used in the wire thermocompression bonding apparatus according to the present invention.

FIG. 6 is an explanatory view explaining the operation of the thermocompression bonding apparatus for electric wires according to the present invention.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a side view showing a plurality of electric wires thermocompression-bonded by an electric wire thermocompression bonding apparatus according to the present invention.

FIG. 9 is a perspective view showing a plurality of electric wires thermocompression bonded in another embodiment of the method for thermocompression bonding of electric wires according to the present invention.

FIG. 10 is an explanatory view for explaining another embodiment of the thermocompression bonding method for electric wires according to the present invention.

FIG. 11 is an explanatory diagram illustrating a conventional thermocompression bonding method for electric wires.

FIG. 12 is a plan view showing a plurality of electric wires thermocompression-bonded by a conventional electric wire thermocompression bonding method.

FIG. 13 is a plan view showing a state in which an insulating tape is wound around a plurality of electric wires thermocompression bonded by a conventional thermocompression bonding method for electric wires.

FIG. 14 is a side view showing a state in which a plurality of electric wires thermocompression-bonded by a conventional electric wire thermocompression bonding method are arranged in a vehicle.

[Explanation of symbols]

10 Wire Thermocompression Bonding Device 12 Lower Electrode 20 Upper Electrode 30 Positioning Means 33 Stopper 33a Steps 40, 41, 42, 50, 51, 52 Electric Wires 40a, 41a, 42a, 50a, 51a, 52a Conductor 42b, 52b End Department

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[Procedure amendment]

[Submission date] June 5, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The tip of the stopper 33 has the upper electrode 2
Like the 0 and the lower electrode 12 , it is made of a tungsten alloy or the like, or is made of ceramic. Therefore, when electricity is applied between the upper electrode 20 and the lower electrode 12 , the conductor parts 40a, 41a, 42a, which will be described later, can be sufficiently heated. Thereby, the conductor portion 40a,
It is possible to surely thermally compress the parts 41a, 42a ... And improve the quality.

Claims (7)

[Claims] 1. An insulating coating portion of a plurality of electric wires is peeled off to expose each conductor portion, each conductor portion is sandwiched between a pair of electrodes, and an electric current is applied between the pair of electrodes so that each conductor portion is exposed. A thermocompression bonding method for an electric wire, wherein the end portion of the conductor portion is positioned between the pair of electrodes by a positioning means. 2. The positioning means includes a stopper, the tip of the stopper is disposed between the pair of electrodes, and the end of the conductor is brought into contact with the tip of the stopper so as to bring the end of the conductor into contact. The thermocompression bonding method for an electric wire according to claim 1, wherein the portion is positioned between the pair of electrodes. 3. The tip of the stopper abuts the tip of the conductor at a position lower than the height of the conductors sandwiched by the pair of electrodes. The thermocompression bonding method for the electric wire described. 4. The conductors of the plurality of wires are peeled off to expose the respective conductor portions, the conductor portions are sandwiched between a pair of electrodes, and an electric current is applied between the pair of electrodes to form a conductor. An electric wire thermocompression bonding apparatus for thermocompression-bonding a portion, comprising a positioning means for positioning an end portion of the conductor portion between the pair of electrodes. 5. The positioning means includes a stopper having a tip end portion that can be arranged between the pair of electrodes, and an end portion of the conductor portion is brought into contact with the tip end portion of the stopper to bring the end portion of the conductor portion into contact with the end portion. The electric wire thermocompression bonding device according to claim 4, wherein the thermocompression bonding device is positioned between the pair of electrodes. 6. The thermocompression bonding device for an electric wire according to claim 5, wherein a height of a tip portion of the stopper is lower than heights of the plurality of conductor portions sandwiched by the pair of electrodes. 7. The electric wire thermocompression bonding apparatus according to claim 6, wherein the tip of the stopper is formed of a member having a high resistance and a high melting point, such as a tungsten alloy.