JP2010073475A - Electric wire joint method and electric wire joint device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wire joint method in which a fault of cut, fray or the like of an electric wire core wire and a state leading to fixing strength deterioration can be avoided in an electric wire joint method by ultrasonic joint, and to provide an electric wire joint device. <P>SOLUTION: The electric wire joint device 10 includes: an anvil 4; a bracket implement 5; and a chip 11. The anvil 4 is provided with a channel 6 in which core wires 2 of two or more electric wires 1 are held. The width 6b of the channel 6 is formed so as to be smaller than a summation of an outer diameter of the core wires 2 of the electric wires 1. In addition, the core wires 2 of two or more electric wires 1 to be joined are held in the channel 6, the chip 11 is made to intrude into the channel 6 of the anvil 4, the core wires 2 of the two or more electric wires 1 are pressurized in a direction causing them to be mutually close, and then a supersonic vibration energy is given, thereby joining the core wires 2 of the two or more electric wires. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric wire bonding method and an electric wire bonding apparatus for bonding core wires of a plurality of electric wires to each other by ultrasonic bonding.

  Various electronic devices are mounted on an automobile as a moving body. In the automobile, a wire harness is routed to transmit electric power from a power source such as a battery or a control signal from a control device to the electronic device. The wire harness described above includes a plurality of electric wires and a joint portion that electrically connects the electric wires.

  Each of the electric wires includes a conductive core wire and an insulating covering portion that covers the core wire. The joint portion is configured by caulking the exposed core wire with a joint terminal or the like after removing a covering portion at a predetermined portion of the electric wire. For this reason, the wire harness uses a joint terminal to electrically connect the electric wires.

  As for the some electric wire which comprises the said wire harness, the core wires of at least one part electric wire needed to be mutually connected. Therefore, when joining electric wires, the conventional wire joining method has a problem that the tip position of the core wire portion is shifted or the tips are not aligned and become dirty.

  In order to solve the above-described problem, the applicant of the present invention joins the core wires of the electric wires by applying ultrasonic vibration energy to one electric wire in a state where the electric wires are pressed in a direction in which the electric wires are brought closer to each other. This is proposed (see Patent Document 1).

  In Patent Document 1, a core wire of a small number of electric wires joined to each other is accommodated in a receiving groove of a receiving tool (anvil), an ultrasonic horn having a chip is inserted into the receiving groove, and ultrasonic waves are passed through the chip. The electric wire connection method which joins the core wires mentioned above by giving energy is shown.

In the electric wire connection method of Patent Document 1, first, the covering portions of the plural electric wires located at the joint location are removed, and the tips are aligned. Then, the plurality of electric wires are divided into a plurality of sets of a small number of electric wires, the core wires of the small number of electric wires are accommodated in the receiving grooves of the receiving tool, and the ultrasonic horn is inserted into the receiving grooves. Then, the core wires of the small number of electric wires are temporarily joined with the ultrasonic horn for each divided set to form a plurality of sets of temporarily joined wires. Thereafter, the temporarily joined core wires of the plurality of sets of temporarily joined wires are finally joined to each other with the ultrasonic horn to form a set of permanently joined wires.
JP 2007-134307 A

  In the electric wire connection method disclosed in Patent Document 1 described above, a groove is provided in a receiving tool (anvil) in order to prevent the displacement of the core wire of the electric wire, and a plurality of electric wires are formed in the receiving groove (anvil groove). The core wire is accommodated. At that time, the core wires of the electric wires accommodated in the grooves may be arranged side by side, or the electric wires may be arranged apart from each other. As a result, there may be a case where the adhesion force between the wires is insufficient.

  In addition, in order to prevent the above-described lack of fixing force, when the force is further applied in the direction in which the tip and the anvil are brought closer to each other, the wires are not separated from each other in the receiving groove. There was a risk of fraying.

  Therefore, the object of the present invention is to pay attention to the above-mentioned problems, and in the wire bonding method by ultrasonic bonding, it is possible to avoid problems such as wire breakage and fraying of the wire, and a state that leads to a decrease in fixing force. An object of the present invention is to provide a wire bonding method and a wire bonding apparatus.

  In order to solve the above problems and achieve the object, the wire joining method of the present invention according to claim 1 is provided in a groove provided in one of a tip vibrated by a driving source and an anvil facing the tip. The core wires of the plurality of electric wires are accommodated, the other is made to enter the groove, the chip is vibrated by the driving source, and the vibration is transmitted to the core wires of the plurality of electric wires, so that the core wires of the plurality of electric wires are connected to each other. In the wire joining method for joining together, the width of the groove is formed to be smaller than the sum of the outer diameters of the core wires of the plurality of wires.

  According to a second aspect of the present invention, there is provided an electric wire joining apparatus according to the present invention, comprising: a chip vibrated by a driving source; and an anvil facing the chip; a plurality of grooves are provided in one of the chip and the anvil. The other wire is inserted into the groove, the chip is vibrated by the driving source, and the vibration is transmitted to the core wires of the plurality of wires. In the electric wire joining apparatus to be joined, the width of the groove is smaller than the sum of the outer diameters of the core wires of the plurality of electric wires.

  As described above, according to the first aspect of the present invention, the width of the groove that accommodates the core wire of the electric wire is formed to be smaller than the sum of the outer diameters of the core wires of the plurality of electric wires. For this reason, the fixing force of an electric wire can be strengthened, without the core wire of an electric wire being arrange | positioned side by side in the groove | channel accommodated. For this reason, it is possible to prevent the wires from being cut or frayed.

  In addition, since the core wires of the plurality of electric wires to be joined are accommodated in the groove, the pressure force and the exciting force by the ultrasonic waves can be reliably received without the core wires of the plurality of electric wires being displaced. Therefore, the joining of the electric wires is reliably performed, and the reliability of the electric wire joining is improved.

  Furthermore, by forming the groove width to be smaller than the sum of the outer diameters of the core wires of the plurality of electric wires, the fixing force is improved and the electric wire joining force is increased, so that the electric wire has a smaller energy than the predetermined ultrasonic vibration energy. It becomes possible to join the core wires. For this reason, the disconnection of the thin electric wire installed on the side to which the ultrasonic vibration energy is applied can be prevented. Moreover, since the core wire is not pulled strongly in the pressurizing direction when it is pressurized, it is possible to prevent the wire from being cut off.

  Therefore, it is possible to avoid a state in which a part of the core wires of the plurality of electric wires are joined so as to overlap each other and lead to a decrease in fixing force. In addition, since it is not necessary to increase the force in the direction in which the tip and the anvil come closer to each other, it is possible to eliminate problems such as breakage of the core of the electric wire and fraying.

  Hereinafter, a wire bonding method and a wire bonding apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. An electric wire joining apparatus 10 shown in FIG. 1 and the like is used to electrically connect core wires of a plurality of electric wires as shown in FIGS. 1 and 3.

  The electric wire 1 has a round cross-sectional shape. As illustrated in FIG. 1, the electric wire 1 is a covered electric wire including a conductive core wire 2 and an insulating covering portion 3. The core wire 2 includes a plurality of strands 8. The strand 8 is formed in a round cross section and is made of a conductive metal such as copper or a copper alloy. A plurality of strands 8 are twisted together to constitute the core wire 2. In the example of illustration, it has shown that the core wires of the four electric wires 2 are joined mutually. The covering portion 3 is made of an insulating synthetic resin and covers the core wire 2.

  As shown in FIG. 1, the covering portion 3 of the electric wire 1 located at the place to be joined is removed in advance, and the four core wires 2 are not arranged side by side with the tips aligned, and the anvil 4 is housed in the groove 6 and is stably supported. The covering portion 3 in the middle portion in the longitudinal direction of the electric wire 1 is accommodated in the receiving groove 7 of the receiving tool 5 and is supported in a vertically long shape.

  The electric wire joining apparatus 10 shown in FIG. 1 puts the core wire 2 of the four electric wires 1 in the groove | channel 6 in order, and overlaps the core wire 2 of these four electric wires 1 in a groove | channel. Then, the core wires 2 of the four electric wires 1 are pressed in a direction to approach each other, and ultrasonic vibration energy is applied to the core wires 2 of the four electric wires 1 to join the core wires 2 to each other. Moreover, the ultrasonic vibration energy as used in this specification has shown the energy given to the core wire of this electric wire, when the ultrasonic bonding apparatus 10 joins the core wire 2 of the electric wire 1. FIG. The ultrasonic vibration energy is, for example, energy obtained by multiplying the power value (W: wattage) when the power source is applied to an oscillator (not shown) by the time that the power source is applied to the oscillator.

  As shown in FIG. 1, the wire bonding apparatus 10 includes a chip 11, an anvil 4 facing the chip 11, a horn 12, a piezoelectric vibrator 9 as a drive source, and a receiving tool 5. . A piezoelectric vibrator 9 is attached to the rear of the horn 12, and a chip 11 is attached to the tip of the horn 12. For this reason, the piezoelectric vibrator 9 vibrates the chip 11 via the horn 12 or the like. At this time, the chip 11 vibrates along an arrow B that is orthogonal to the direction in which the chip 11 and the anvil 4 approach (separate) from each other. In addition, contact / separation is a direction which approaches or separates from each other. The chip 11 and the anvil 4 can sandwich the core wire 2 of the electric wire 1 between each other.

  The electric wire joining apparatus 10 accommodates the core wire of the electric wire to be joined in the groove 6 provided in the anvil 4, and the piezoelectric vibrator 9 is moved by an oscillator in a state where the chip 11 is pressurized in a direction approaching the groove 6 of the anvil 4. The vibration is transmitted to the chip 11 via the horn 12. Then, the wire bonding apparatus 10 vibrates the chip 11 along the arrow B, gives ultrasonic vibration energy (also referred to as vibration or ultrasonic vibration) to the core wire 2 accommodated in the groove 6 of the anvil 4, and Join the core wires.

  The chip 11 is formed in a quadrangular prism shape, and includes a flat end surface 11a facing the bottom surface 6a of the anvil 4 as shown in FIG. The width of the end surface 11a of the chip 11 is slightly narrower than the width 6b. The end surface 11 a of the chip 11 is parallel to the bottom surface 6 a of the groove 6 of the anvil 4.

  The anvil 4 is made of metal. As shown in FIGS. 1 to 3, the anvil 4 includes a groove 6 for accommodating the core wire 2 of the electric wire 1 to be joined, and a bottom surface 6 a of the groove facing the chip 11.

  As shown in FIG. 2, the width 6 b of the groove of the anvil 4 is formed to be smaller than the sum of the outer diameters of the core wires 2 of the electric wires 1. That is, the width 6b of the groove is relative to the direction in which the core wire 2 of the electric wire 1 is in the direction of arrow A (parallel to the direction perpendicular to the longitudinal direction of the electric wire 1 and close to the tip 11 and the anvil 4). It is formed in the orthogonal direction.

  The receptacle 5 is made of metal or synthetic resin and includes a receptacle groove 7 that accommodates a plurality of electric wires 1 to be joined. The width of the receiving groove 7 is slightly wider than the width 6b of the groove.

  When joining the core wires 2 of the plurality of wires 1 using the wire joining device 10 having the above-described configuration, first, the core wires 2 of the plurality of wires 1 to be joined are accommodated in the grooves 6 of the anvil 4 and the chip 11 is attached. It moves in the direction of arrow A and enters into the groove 6 of the anvil 4. And the core wire 2 of the some electric wire 1 accommodated in the groove | channel 6 of the anvil 4 is pressed with the chip | tip 11 to the arrow A direction. In this state, the piezoelectric vibrator 9 is vibrated and this vibration is transmitted to the chip 11 via the horn 12. And the electric wire joining apparatus 10 vibrates the chip | tip 4 along the arrow B (direction orthogonal to the arrow A and the direction parallel to the longitudinal direction of the electric wire 1) mentioned above, and the some are accommodated in the groove | channel 6 of the anvil 4 Ultrasonic vibration energy is given to the core wire 2 of the electric wire 1 to join the core wires 2 together.

  Thus, the core wires 2 of the plurality of electric wires 1 are bonded to each other by ultrasonic bonding (also referred to as ultrasonic welding or ultrasonic welding) of the chips 11. That is, the core wires 2 come into contact with each other and are bonded by the vibration and pressurization of the chip 11.

  According to this embodiment, the width 6 b of the groove of the anvil 4 that houses the core wire 2 is formed to be smaller than the sum of the outer diameters of the core wires 2 of the plurality of electric wires 1. For this reason, since the core wire 2 of the some electric wire 1 to join is not arrange | positioned side by side, the core wire 2 can be joined reliably and the adhering force of the core wire 2 can be strengthened. Therefore, fraying of the wire of the electric wire and breakage of the core wire due to insufficient fixing force can be prevented.

  Further, since the core wire 2 of the electric wire 1 is accommodated in the groove 6 of the anvil 4, the core wire 2 can be accurately positioned, and the applied pressure and the exciting force by the chip 11 can be stably received. As a result, the electric wires are reliably joined, and the reliability of the electric wire joining is further improved.

  Further, since the fixing force can be improved by preventing the side-by-side arrangement of the core wires, the ultrasonic energy can be made smaller than the predetermined ultrasonic vibration energy that is normally used. For this reason, it is possible to prevent disconnection of a thin electric wire installed on the side to which ultrasonic vibration energy is applied, and to suppress power consumption.

  In the above-described embodiment, the example in which the core wire 2 at the end of the electric wire 1 is joined has been shown. However, as shown in FIG. 3, the intermediate core wire 2 of the electric wire 1 can be joined. Therefore, it can join at various places of the electric wire 1. In addition, the same code | symbol is attached | subjected to the part same as embodiment mentioned above, and description is abbreviate | omitted.

  Furthermore, although the groove | channel which accommodates the electric wire to join in the above-mentioned embodiment was provided in the anvil 4, you may provide a groove | channel in the chip | tip 11. FIG. In this case, the anvil 4 is advanced into the groove of the chip 11 and the core wire of the electric wire is joined. That is, a groove may be provided on either the anvil 4 or the chip 11.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is an electric wire joining device perspective view concerning one embodiment of the present invention. It is sectional drawing of the anvil along the II line | wire in FIG. It is a perspective view which shows the modification of the electric wire joining apparatus shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric wire 2 Core wire 3 Covering part 4 Anvil 5 Receiving tool 6 Groove 6a Groove bottom face 6b Groove width 7 Receiving groove 8 Elementary wire 9 Piezoelectric vibrator (drive source)
10 Wire Joining Device 11 Chip 11a End Surface (End Surface of Chip)
12 Horn

Claims (2)

A core wire of a plurality of electric wires is accommodated in a groove provided in one of a chip vibrated by a driving source and an anvil facing the chip, and the other is caused to enter the groove, and the chip is vibrated by the driving source. In the wire joining method for joining the core wires of the plurality of wires to each other by transmitting the vibration to the core wires of the plurality of wires,
The wire joining method, wherein a width of the groove is formed to be smaller than a sum of outer diameters of core wires of the plurality of electric wires. A chip vibrated by a drive source, and an anvil facing the chip,
A core wire of a plurality of electric wires is accommodated in a groove provided in one of the tip and the anvil, the other is inserted into the groove, and the tip is vibrated by the driving source to cause the vibration to the plurality of electric wires. In the wire joining device that joins the core wires of the plurality of electric wires to each other by transmitting to the core wire,
The wire joining apparatus, wherein a width of the groove is smaller than a sum of outer diameters of core wires of the plurality of electric wires.

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