JP6043073B2 - Cable with terminal and manufacturing method thereof - Google Patents

Description

  The present invention relates to a cable with a terminal and a manufacturing method thereof.

  The cable generally includes a conductive wire and an insulating layer covering the conductive wire. At least a part of both ends of the conductive wire is exposed, and a terminal is joined to the exposed end. Conventionally, such a cable with a terminal has been configured by joining an end portion of a cable conductor and a metal terminal by caulking or crimping. However, in joining by caulking or crimping, it cannot be said that the reliability of joining between the terminal and the conductor in the cable with terminal is sufficient. Therefore, in order to improve the reliability of bonding between the terminal and the conductive wire, for example, Patent Document 1 below proposes a cable with a terminal in which the exposed end portion of the conductive wire and one surface of the terminal are ultrasonically bonded. .

JP 2011-60726 A

  However, the cable with a terminal described in Patent Document 1 has the following problems.

  That is, in the cable with a terminal, the breaking force of the joint between the exposed end of the conductor and the terminal is not sufficient with respect to the breaking force of the conductor itself, and the breaking force of the joint with respect to the breaking force of the conductor is not sufficient. There is still room for improvement in terms of the ratio (hereinafter referred to as “strength residual rate”). In particular, in recent years, cable weight reduction and diameter reduction have been demanded, and the bonding area between the conducting wire and the terminal has become narrower, and the problem of the joining strength between the terminal and the conducting wire becomes significant. For this reason, there is an increasing demand for improving the residual strength rate of cables with terminals.

  This invention is made | formed in view of the said situation, and it aims at providing the cable with a terminal which has the outstanding intensity | strength residual rate, and its manufacturing method.

  In order to solve the above problems, the present inventor has intensively studied the configuration of a cable with a terminal having an excellent strength remaining rate. As a result, the present inventors have found that the above-described problems can be solved by the following invention.

The present invention includes a cable, which is an exposed end portion including at least one end portion of both ends of the conductor wire, including a conductor wire and an insulating layer covering the conductor wire, and the cable of the conductor wire. a method of manufacturing a terminal with cable for producing a Bei obtain end child with cable and a pin having a first metal plate that will be bonded to the exposed end portion, a preparation step of preparing the cable, the exposure of the wire Conductive wire exposed end portion arranging step of arranging the end portion on the first metal plate of the terminal, and the exposed end portion of the conductive wire were prepared separately from the first metal plate and the first metal plate. a state sandwiched between the second metal plate, by applying ultrasonic waves to the exposed end portion through the second metal plate, the exposed end portions, and the first metal plate and the second metal plate Without joining the first metal plate and the first metal plate to each other. And a ultrasonic bonding process for each ultrasonic bonding of metal plate, the formed first metal plate and the second metal plate to each other in the same kind of metal, a method for producing a terminal with cable.

According to the method for manufacturing a cable with a terminal of the present invention, a cable with a terminal having an excellent strength remaining rate can be manufactured.
In the method for manufacturing a cable with a terminal, it is preferable that the first metal plate, the second metal plate, and the conductive wire are made of the same type of metal.
In this case , compared with the case where the first metal plate and the second metal plate and the conducting wire are made of different types of metals, the bonding strength between the first metal plate and the conducting wire , the second metal plate and the conducting wire, The bonding strength can be further increased.
Further, in the method for manufacturing a cable with a terminal, in the ultrasonic bonding step, a recess is formed in each of the first metal plate and the second metal plate, and the exposed end portion of the conducting wire is formed in each recess. It is preferable to allow a part to enter.
In this case , compared with the case where a recessed part is not formed in each of a 1st metal plate and a 2nd metal plate, it can have the outstanding strength remaining rate.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the cable with a terminal which has the outstanding intensity | strength residual rate, and the cable with a terminal is provided.

It is a fragmentary top view which shows one Embodiment of the cable with a terminal of this invention. It is a cut surface end view along the II-II line of FIG. It is an end elevation which shows an example of the conducting wire of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a partial plan view showing an embodiment of a cable with a terminal of the present invention, FIG. 2 is a sectional end view taken along the line II-II in FIG. 1, and FIG. 3 is an example of a conducting wire in FIG. It is an end view.

  As shown in FIG. 1, the cable 100 with a terminal according to the present embodiment includes a cable 10 and a terminal 20 provided at at least one end of the cable 10.

  The cable 10 includes a conductive wire 11 and an insulating layer 12 that covers the conductive wire 11, and is an exposed end portion 13 in which at least one end of both ends of the conductive wire 11 is exposed.

  On the other hand, as shown in FIG. 1, the terminal 20 includes a band-shaped main body portion 21, a ring-shaped end portion 22 having an opening 22 a that is connected to one end of the main body portion 21 and through which a bolt or the like is inserted, and the main body portion 21. It has a pair of alignment pieces 23 that are connected to the other end and align the cable 10, and a conductive wire joint portion 24 that is joined to the exposed end portion 13 of the conductive wire 11.

  As shown in FIG. 2, the conductive wire joint portion 24 has a first conductive wire joint portion 25 and a second conductive wire joint portion 26. Here, the 1st conducting wire junction part 25 is comprised by a part of main-body part 21, and the 2nd conducting wire junction part 26 is arrange | positioned so that the 1st conducting wire junction part 25 may be opposed and spaced apart. The conductive wire joint 24 further includes a side wall 27 that connects the edge of the first conductive wire joint 25 and the edge of the second conductive wire joint 26.

  The first conductive wire joint portion 25 and the second conductive wire joint portion 26 are each ultrasonically joined to the exposed end portion 13 of the conductive wire 11. In addition, the recessed part 25a is formed in the 1st conducting wire junction part 25, and a part of exposed end part 13 of the conducting wire 11 has penetrated into the recessed part 25a. A recess 26a is also formed in the second conductor joint portion 26, and a part of the exposed end portion 13 of the conductor 11 enters the recess 26a.

  According to the terminal-equipped cable 100 described above, it is possible to have an excellent strength remaining rate.

  Although the reason for this is not clear, the present inventor, in addition to the exposed end portion 13 of the conducting wire 11 and the first conducting wire joint portion 25 being ultrasonically joined, the exposed end portion 13 of the conducting wire 11 and the terminal It is speculated that the joining strength between the exposed end portion 13 of the conducting wire 11 and the first conducting wire joining portion 25 is improved by the ultrasonic joining of the 20 second conducting wire joining portions 26.

  Moreover, in the cable 100 with a terminal, the 1st conducting wire junction part 25 and the 2nd conducting wire junction part 26 are connected by the side wall part 27. FIG. For this reason, the bonding area of the exposed end 13 to the terminal 20 is further increased, and the bonding strength of the exposed end 13 to the terminal 20 can be further increased. As a result, it is possible to have a better strength remaining rate.

  Furthermore, in the cable 100 with a terminal, the recessed part 25a is formed in the 1st conducting wire junction part 25, and a part of exposed end part 13 of the conducting wire 11 has penetrated into the recessed part 25a. For this reason, compared with the case where the recessed part 25a is not formed in the 1st conducting wire junction part 25, it becomes possible to increase the joining area of the exposed end part 13 and the 1st conducting wire junction part 25, and the exposed end part 13 And the first conductive wire joint portion 25 can be further improved in bonding strength. As a result, it is possible to have a better strength remaining rate. Similarly, in the cable 100 with a terminal, the recessed part 26a is formed in the 2nd conducting wire junction part 26, and a part of the exposed end part 13 of the conducting wire 11 has entered into the recessed part 26a. For this reason, compared with the case where the recessed part 26a is not formed in the 2nd conducting wire junction part 26, it becomes possible to increase the joining area of the exposed end part 13 and the 2nd conducting wire junction part 26, and the exposed end part 13 And the second conductive wire joint portion 26 can be further improved in bonding strength. As a result, it is possible to have a better strength remaining rate.

  Next, the cable 10 and the terminal 20 will be described in detail.

(cable)
The cable 10 includes the conductive wire 11 and the insulating layer 12 as described above.

  The conducting wire 11 may be a single metal wire made of a single metal or a composite metal wire in which a plurality of types of metals are combined. When the conducting wire 11 is a composite metal wire, the conducting wire 11 includes a center conductor 11a and a covered conductor 11b covering the center conductor 11a, as shown in FIG. 3, for example. Examples of the center conductor 11a include steel and titanium. As the coated conductor 11b, a conductor that is softer than the central conductor 11a and has an electric resistance lower than that of the central conductor 11a is preferably used. Examples of such a covered conductor 11b include metals such as copper, copper alloys, and aluminum.

  The insulating layer 12 may be made of an insulating material, and examples of such a material include synthetic resins such as polyvinyl chloride, polyethylene, fluororesin, and polyester.

(Terminal)
As described above, the terminal 20 includes the band-shaped main body portion 21, the ring-shaped end portion 22, the pair of alignment pieces 23, and the conductive wire joint portion 24.

  The main body 21, the ring-shaped end 22 and the alignment piece 23 may be made of metal, but are made of a metal having a relatively low resistance, for example, a copper alloy such as copper or brass, silver, or a nickel-iron alloy. It is preferable.

  As described above, the conductive wire joint portion 24 includes the first conductive wire joint portion 25 and the second conductive wire joint portion 26.

  Although the 1st conducting wire junction part 25 should just also be comprised with the metal, it is preferable to comprise with metals which have comparatively low resistance, for example, copper alloys, such as copper and brass, silver, and a nickel-iron alloy.

  Although the 2nd conducting wire junction part 26 should just be comprised with the metal, it is preferable that it is comprised with metals which have comparatively low resistance, for example, copper alloys, such as copper and brass, silver, and a nickel-iron alloy.

  Here, it is preferable that the 1st conducting wire junction part 25 and the 2nd conducting wire junction part 26 are mutually comprised with the same kind of metal as the conducting wire 11 or the covered conductor 11b. In this case, compared with the case where the 1st conducting wire junction part 25 and the 2nd conducting wire junction part 26, and the conducting wire 11 or the covered conductor 11b are comprised with a different kind of metal, the 1st conducting wire junction part 25 and the exposed end part 13 are comprised. The bonding strength between the second conductive wire bonding portion 26 and the exposed end portion 13 can be further increased.

  Specifically, it is preferable that the lead wire 11 or the covered conductor 11b is made of copper or a copper alloy, and the first lead wire joint portion 25 and the second lead wire joint portion 26 are also made of copper or a copper alloy.

  Next, the manufacturing method of the cable 100 with a terminal is demonstrated in detail.

  First, the cable 10 and the terminal 20 to be joined to the exposed end 13 of the conductive wire 11 of the cable 10 are prepared (preparation step).

  Next, the exposed end portion 13 of the conductor 11 of the cable 10 is disposed on the first conductor joint 25 of the conductor joint 24. In the present embodiment, specifically, the exposed end portion 13 of the conducting wire 11 is disposed between the first conducting wire joint portion 25 and the second conducting wire joint portion 26 (lead wire exposed end portion arranging step).

  Next, the ultrasonic wave generation unit is pressed against the second conductor joint portion 26 of the terminal 20 in a state where the exposed end portion 13 of the conductor wire 11 is sandwiched between the first conductor joint portion 25 and the second conductor joint portion 26. Applying ultrasonic waves while applying a load to ultrasonically bond the first conductor joint 25 and the exposed end 13 of the conductor 11, and connect the second conductor joint 26 and the exposed end 13 of the conductor 11 to each other. Ultrasonic bonding (ultrasonic bonding process).

  In this way, the cable 100 with a terminal is obtained.

  According to the said manufacturing method, the cable 100 with a terminal which has the outstanding intensity | strength residual rate can be obtained.

  Moreover, in the cable 100 with a terminal, the recessed part 25a is formed in the 1st conducting wire junction part 25, and the exposed end part 13 of the conducting wire 11 will enter into the recessed part 25a. For this reason, compared with the case where the recessed part 25a is not formed in the 1st conducting wire junction part 25, it becomes possible to increase the joining area of the exposed end part 13 and the 1st conducting wire junction part 25, and the exposed end part 13 and the 1st The bonding strength with the one-conductor bonding portion 25 can be further improved. As a result, it is possible to have a better strength remaining rate. Similarly, in the cable 100 with a terminal, the recessed part 26a is formed in the 2nd conducting wire junction part 26, and the exposed end part 13 of the conducting wire 11 will enter into the recessed part 26a. For this reason, compared with the case where the recessed part 26a is not formed in the 2nd conducting wire junction part 26, it becomes possible to increase the joining area of the exposed end part 13 and the 2nd conducting wire junction part 26, and the exposed end part 13 and the 1st The joint strength with the two-conductor joint portion 26 can be further improved. As a result, it is possible to have a better strength remaining rate.

  Furthermore, according to the above manufacturing method, an ultrasonic wave is not directly applied to the exposed end portion 13 by the ultrasonic wave generating unit, but an ultrasonic wave is applied via the second conductor joining portion 26. For this reason, damage to the exposed end portion 13 due to ultrasonic waves can be reduced. For example, the surface layer portion of the exposed end portion 13 can be sufficiently suppressed from being removed by friction with the ultrasonic wave generating portion. In particular, when the conductive wire 11 is composed of the central conductor 11a and the covered conductor 11b, the covered conductor 11b is removed by friction, and the central conductor 11 is sufficiently suppressed from being exposed. As a result, corrosion of the conductive wire 11 is sufficiently suppressed.

  Next, the ultrasonic bonding process described above will be described in detail.

  In the ultrasonic bonding step, a preferable load range applied when the exposed end portion 13 is pressed through the second conductive wire bonding portion 26 varies depending on the ultrasonic application time. For example, when the application time of ultrasonic waves is 0.1 to 0.2 seconds, the load is preferably 20 to 50N, and more preferably 30 to 50N. When the application time is 0.2 to 0.3 seconds, the load is preferably 10 to 50N, more preferably 35 to 50N. Furthermore, when the application time is 0.3 to 0.4 seconds, the load is preferably 10 to 50N, and more preferably 40 to 50N.

  The application time of the ultrasonic wave is preferably 0.1 to 0.3 seconds, more preferably 0.2 to 0.3 seconds.

  The applied frequency of the ultrasonic wave is preferably 20 to 40 kHz, more preferably 30 to 40 kHz.

  The amplitude of the ultrasonic wave is preferably 1 to 20 μm, more preferably 1 to 10 μm.

  Furthermore, the vibration direction of the ultrasonic wave may be a direction along the longitudinal direction of the conducting wire 11 or a direction perpendicular to the longitudinal direction of the conducting wire 11, but the conducting wire 11 is less likely to rotate than a direction perpendicular to the longitudinal direction of the conducting wire 11. The direction along the longitudinal direction of the conducting wire 11 is preferable because it is difficult to twist.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the conducting wire 11 of the cable 10 is a single wire conductor, but the conducting wire 11 is not necessarily a single wire, and may be a stranded wire conductor formed by twisting a plurality of single wire conductors. In this case, a preferable range of the load applied when the exposed end portion 13 is pressed through the second conductor joint portion 26 varies depending on the application time of the ultrasonic wave. For example, when the application time of ultrasonic waves is 0.1 to 0.3 seconds, the load is preferably 60 to 150N, more preferably 100 to 150N. Moreover, when an application time is 0.3 to 0.5 second, a load becomes like this. Preferably it is 60-150N, More preferably, it is 100-150N. Furthermore, when the application time is 0.5 to 0.7 seconds, the load is preferably 60 to 150N, and more preferably 100 to 150N. The applied frequency of the ultrasonic wave, the amplitude of the ultrasonic wave, and the vibration direction of the ultrasonic wave may be the same as in the above embodiment.

  Moreover, in the said embodiment, although the conducting wire junction part 24 has the one side wall part 27, the conducting wire junction part 24 may further have the side wall part 27 so that the exposed end part 13 may be pinched | interposed.

  Furthermore, in the said embodiment, although the conducting wire junction part 24 has the side wall part 27, the conducting wire junction part 24 does not necessarily need to have the side wall part 27. FIG. In this case, the 1st conducting wire junction part 25 and the 2nd conducting wire junction part 26 are not connected.

  Furthermore, in the above-described embodiment, the terminal 20 includes the band-shaped main body portion 21, the ring-shaped end portion 22, the alignment piece 23, and the conductive wire joint portion 24, but the terminal 20 includes the conductive wire joint portion 24. The ring-shaped end portion 22 and the alignment piece 23 are not necessarily required.

  Furthermore, in the said embodiment, although the 1st conducting wire junction part 25 has the recessed part 25a and the 2nd conducting wire junction part 26 has the recessed part 26a, the recessed part 25a and the recessed part 26a are not necessarily required, and abbreviate | omits. Is possible.

  Moreover, in the said embodiment, although the 2nd conducting wire junction part 26 is beforehand connected with the side wall part 27 at the time of an ultrasonic joining process, the 2nd conducting wire junction part 26 is a side wall part at the time of an ultrasonic joining process. 27 may not be connected. In this case, the second conductor joint portion 26 may be joined to the first conductor joint portion 25 in the ultrasonic joining process, or not joined to the first conductor joint portion 25 in the ultrasound joining process. You may be made to do. Alternatively, the second conductor joint portion 26 may be joined only to the exposed end portion 13 without being joined to the first conductor joint portion 25 or the side wall portion 27 in the ultrasonic joining step.

Hereinafter, the content of the present invention will be described more specifically with reference to Examples , Reference Examples, and Comparative Examples, but the present invention is not limited to the following Examples.

Example 1
First, a cable was prepared. The cable was formed by coating a Cu-coated steel wire (hereinafter referred to as “CS wire”) having a diameter of 0.1 mm with an insulating layer made of polyvinyl chloride having a thickness of 0.3 mm. Here, the CS wire has a central conductor made of steel and a coated conductor made of Cu, and the area ratio of Cu in the cross section perpendicular to the longitudinal direction of the CS wire was 40%. Further, in the CS line, only one end is set as an exposed end, and the length of the exposed end is set to 15 mm along the longitudinal direction of the CS.

  On the other hand, a copper plate of 20 mm × 10 mm × 1 mm was prepared as a structure (first conductor joint).

  And on this copper plate, one said CS line was arrange | positioned so that the longitudinal direction of a copper plate and the longitudinal direction of the said CS line may orthogonally cross. Subsequently, a copper foil of 5 mm × 10 mm × 0.2 mm was placed on the exposed end of the CS line.

  On the other hand, as an ultrasonic generator, Seidensha Kogyo: SONOPET Σ-GM750 was prepared. The ultrasonic horn (ultrasonic generator) constituting this ultrasonic generator had a flat contact surface of 1 mm × 10 mm.

  Then, the contact surface of the ultrasonic horn of the ultrasonic generator is pressed against the copper foil disposed on the exposed end of the CS line, and a load of 50 N is applied to the exposed end via the copper foil. However, an ultrasonic wave having a frequency of 40 kHz and an amplitude of 10 μm was applied for 0.2 seconds. At this time, the vibration direction of the ultrasonic wave was set along the longitudinal direction of the CS line. In this manner, the exposed end of the CS line and the copper plate were ultrasonically bonded, and the exposed end of the CS line and the copper foil were ultrasonically bonded to produce a cable with a terminal. At this time, the copper foil and the copper plate were not joined to each other.

( Reference Example 1 and Examples 3 to 6)
A terminal-attached cable was produced in the same manner as in Example 1 except that the bonding state of the copper foil and the copper plate, the load applied to the exposed end, and the ultrasonic wave application time were as shown in Table 1.

( Reference Example 2 )
The conductor is changed from a single conductor composed of one CS wire to a twisted conductor formed by twisting seven CS wires, and the load applied to the exposed end is changed from 50N to 150N, and the copper foil and the copper plate A terminal-attached cable was produced in the same manner as in Example 1 except that was joined.

(Example 8 and Reference Examples 3 to 6 )
A terminal-attached cable was produced in the same manner as in Reference Example 2 except that the bonding state between the copper foil and the copper plate, the load applied to the exposed end, and the ultrasonic wave application time were changed as shown in Table 2.

(Comparative Example 1)
A cable with a terminal was produced in the same manner as in Example 1 except that the ultrasonic horn was directly pressed against the exposed end portion of the conducting wire without placing a copper foil on the CS wire and ultrasonic waves were applied.

(Comparative Example 2)
A cable with a terminal was prepared in the same manner as in Reference Example 1 except that an ultrasonic wave was applied by directly pressing the ultrasonic horn against the exposed end of the conductor without placing a copper foil on the CS wire.

<Characteristic evaluation>
(Strength remaining rate)
About the cable with a terminal produced in Example 1 , Reference Example 1, Examples 3-6, Reference Example 2, Example 8, Reference Examples 3-6, and Comparative Examples 1-2, the copper plate and the cable are pulled in directions opposite to each other. The force when the exposed end portion of the conducting wire was detached from the terminal was measured as the breaking force of the joint portion between the exposed end portion of the conducting wire and the terminal. The results are shown in Tables 1 and 2.

On the other hand, the breaking force of the conductor wires produced in Example 1 , Reference Example 1, Examples 3-6, Reference Example 2, Example 8, Reference Examples 3-6 and Comparative Examples 1-2 was measured. And the intensity | strength residual rate was computed based on the following formula. The results are shown in Tables 1 and 2.
Strength remaining ratio (%) = Breaking force of joint (N) / Breaking force of conductor (N) × 100 (%)

From the results shown in Table 1 and Table 2, the cables with terminals of Example 1 , Reference Example 1, Examples 3-6, Reference Example 2, Example 8, and Reference Examples 3-6 are the terminals of Comparative Examples 1-2. It has been found that it has an excellent strength remaining rate as compared with the cable with attachment.

  Therefore, according to the cable with a terminal of the present invention, it was confirmed that it was possible to have an excellent strength remaining rate.

DESCRIPTION OF SYMBOLS 10 ... Cable 11 ... Conductor 12 ... Insulating layer 13 ... Exposed end 20 ... Terminal 24 ... Conductor junction 25 ... 1st conductor junction 26 ... 2nd Conductor joint 100 ... Cable with terminal

Claims (3)

A conductive wire and an insulating layer covering the conductive wire, the cable being an exposed end portion where at least one end portion of both ends of the conductive wire is exposed; and the exposed end portion of the conductive wire of the cable a method of manufacturing a terminal with cable for producing the ends of the terminal with a cable to obtain Bei a pin having a first metal plate that will be joined,
A preparation step of preparing the cable;
Conductive wire exposed end portion disposing step of disposing the exposed end portion of the conductive wire on the first metal plate of the terminal ;
The exposed end portion of the conducting wire is sandwiched between the first metal plate and a second metal plate prepared separately from the first metal plate, and the exposed end portion is interposed through the second metal plate. By applying ultrasonic waves, the exposed end portion is ultrasonically bonded to each of the first metal plate and the second metal plate without bonding the first metal plate and the second metal plate to each other. And an ultrasonic bonding process to
The manufacturing method of the cable with a terminal by which a said 1st metal plate and a said 2nd metal plate are comprised with the mutually same kind of metal. The manufacturing method of the cable with a terminal of Claim 1 with which the said 1st metal plate, the said 2nd metal plate, and the said conducting wire are comprised with the mutually same kind of metal. The said ultrasonic bonding process WHEREIN: A recessed part is formed in each of the said 1st metal plate and the said 2nd metal plate, and a part of the said exposed end part of the said conducting wire is penetrated into each said recessed part. Of manufacturing cable with terminal.

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