JP5950893B2 - Manufacturing method of electric wire with crimp terminal and oxide film removing device - Google Patents

Description

  The present invention relates to an oxide film removing apparatus for performing an end treatment for removing an oxide film on a conductor exposed portion obtained by peeling off the insulating coating on the tip end side of a covered electric wire and exposing a conductor composed of a plurality of strands. The present invention relates to an electric wire with a crimp terminal in which a conductor exposed portion in a covered electric wire provided with a processed conductor exposed portion is crimp-connected to a crimp terminal, and a method for manufacturing an electric wire with a crimp terminal.

  The wire harness is routed so as to be connectable to electrical equipment and a power supply device installed in an automobile or the like.

  Covered wires that make up the wire harness routed in automobiles, etc. are insulated on the end side of the covered wires when connecting to other covered wires, or when connecting to connection points of electrical equipment or power supply devices. The conductor exposed part from which the material is peeled and removed is connected to the crimping part of the crimping terminal.

However, since the insulating coating is peeled off from the exposed conductor portion, an oxide film is easily formed on the surface of the plurality of strands constituting the exposed conductor portion, and crimping is performed with the oxide coating formed on the surface of the strand. When crimping to the crimping part of the terminal, the electrical resistance between the crimping part and the conductor exposed part was increased, and stable electrical connection performance could not be obtained.

  In recent years, as a conductor of a covered electric wire routed to a vehicle as a part of an automobile wire harness or the like, an aluminum core wire is often used for the purpose of reducing the weight, but particularly when the conductor is an aluminum core wire. As compared with copper wire, there is a characteristic that a strong oxide film can be easily formed.

  For this reason, the oxide film on the surface of the wire constituting the conductor may be removed when the conductor exposed portion is crimped and connected at the crimping portion, for example, when the crimping connection is made higher than the normal compression rate. Although it is conceivable, when the compression rate is increased, there is a problem that the strand break occurs.

For such a problem, before crimping and connecting the exposed conductor portion with the crimp terminal, for example, resistance welding or soldering as in Patent Document 1 is performed on the exposed conductor portion. Measures have been taken to remove the oxide film on the surface of the wire constituting the conductor.
Patent Document 1 discloses a wire soldering method and apparatus for soldering a core wire end after a skinning process on the wire end.

However, during the above-described end processing, there is a possibility that the conductor exposed portion may lose its shape due to the unraveling or bending deformation of the plurality of strands in the conductor exposed portion.
If it does so, the conductor exposure part cannot be appropriately arrange | positioned and crimped | bonded to the crimping | compression-bonding part, but the subject that the stable electrical connection between a crimping | compression-bonding part and a conductor exposure part cannot be obtained has arisen.
In particular, as the core wire becomes thicker, it becomes more necessary to perform end treatment in order to ensure conduction between the wires inside the conductor. It was.

Japanese Unexamined Patent Publication No. 2000-51982

  Accordingly, the present invention relates to an electric wire with a crimp terminal that can secure an excellent connection strength at the connection location, the electrical resistance at the connection location between the crimp portion and the conductor exposed portion, a method for manufacturing the electric wire with the crimp terminal, and an oxide film An object is to provide a removal device.

The present invention relates to a crimp terminal in which a conductor exposed portion in which a conductor is exposed by peeling off the insulating coating on the tip end side of a covered electric wire in which a conductor composed of a plurality of strands is coated with an insulating coating is connected to a crimp portion of a crimp terminal. A method for manufacturing an attached electric wire, comprising: an electric wire end treatment step performed on the conductor exposed portion; an electric wire insertion step of inserting the conductor exposed portion into the crimp portion formed in a tubular shape; and the conductor exposed portion. perform a crimping step of crimping the said crimping portion in this order, the electric wire end portion processing step, so that the conductor exposed portion in a desired shape that can be inserted into the crimping portion, and the tip of the exposed conductor portion The intermediate position between the insulating coating and the tip of the insulating coating is regulated by regulating means, and ultrasonic soldering is performed to impart ultrasonic vibration to the conductor exposed portion while the conductor exposed portion is immersed in a solder solution. Specially To.

  According to the configuration described above, the cross-sectional shape orthogonal to the longitudinal direction of the conductor exposed portion is deformed by unraveling or bending deformation of the plurality of strands in the conductor exposed portion during the wire end portion processing step. The conductor exposed portion can be restricted by the restricting means so as to have a desired shape that can be inserted into the crimping portion.

  For this reason, for example, even if the conductor size is, for example, 20 sq, that is, a so-called thick conductor having a finishing outer radius larger than 8.6 mm, the end of the electric wire is not deformed. Thus, the wire end portion processing step can be performed properly, so that the oxide film on the surface of the wire constituting the conductor can be reliably removed to reduce and stabilize the electrical resistance.

Moreover, since the end portion of the electric wire is not out of shape, when the conductor exposed portion is crimped to the crimping portion, it can be crimped in an appropriately disposed state, so that an electrical stable connection is provided as well as strength. Performance can be obtained.
Therefore, the electrical resistance of the connection location of a crimping | compression-bonding part and a conductor exposure part is low, and the electric wire with a crimping terminal of the intensity | strength excellent in the connection location can be obtained.

  When compressing a covered electric wire, it is not necessary to set a high compression rate in order to remove the oxide film on the surface of the wire constituting the conductor, so that the wire constituting the conductor is cut along with the compression. The wire breakage does not occur, and the electrical resistance between the crimping part and the conductor exposed part as well as the strength of the conductor exposed part after crimping can be ensured.

Also, the pre-Symbol wire end processing step, the exposed conductor portion into a desired shape that can be inserted into the crimping portion, an intermediate position between the tip of the insulating coating and the tip of the exposed conductor portion In addition to being regulated by the regulating means , cavitation (bubbles) is generated by performing an ultrasonic soldering process that imparts ultrasonic vibration to the conductor exposed portion in a state where the conductor exposed portion is immersed in a solder solution , Due to the cavitation effect using the shock wave generated by the burst of the bubbles, the oxide film on the surface of the exposed conductor can be strongly peeled and removed, and the strands can be bundled with solder.

As an aspect of the present invention, the restricting means may be formed of a restricting frame body in which an orthogonal cross section perpendicular to the longitudinal direction of the conductor exposed portion restricts to a circular shape.
Here, the orthogonal cross section is not limited to a circular shape, but is not particularly limited as long as the orthogonal cross section of the conductor exposed portion is a perfect circle, and is not particularly limited as long as it is a circular shape such as an ellipse or an oval shape.

  Further, as an aspect of the present invention, before the electric wire insertion step, the crimped portion bending process for bending the crimped portion into a cylindrical shape so that the ends of the crimped portion are butted in the circumferential direction, and the butted end End welding that welds the parts together is performed in this order, and before the crimping portion bending process, according to the difference between the outer circumferential length and the inner circumferential length based on the thickness of the crimping portion, With respect to the end of the pressure-bonding part before bending so that the peripheral length of each part in the thickness direction is gradually shortened from the outer peripheral side to the inner peripheral side of the pressure-bonding part before bending. An edge processing step can be performed.

  For example, a crimp terminal that is crimped to a conductor exposed portion of a so-called thick-line conductor having a conductor size of, for example, 20 sq, that is, a finishing outer radius larger than 8.6 mm, crimps an electric wire having a normal thickness thinner than that of the thick line In many cases, the thickness of the crimp terminal is larger than that of the crimp terminal used.

  As described above, when bending is performed so that the ends of the crimped parts before crimping face each other in the circumferential direction due to the thickness of the crimped part, the circumferential ends of the crimped parts are inward in the thickness direction. Since the peripheral side is shorter than the outer peripheral side, only the inner peripheral side abuts, and a gap is generated between the end portions on the outer peripheral side, so that the end portions cannot be welded on the outer periphery side. Will occur.

On the other hand, according to the structure mentioned above, the edge parts of the crimping parts before crimping are butted together in the circumferential direction by performing the edge machining process on the ends of the crimping parts before bending. When the bending process is performed, the peripheral lengths of the inner peripheral side and the outer peripheral side of the crimping part are the same, and the end parts of the crimping part are in contact with each other on the inner peripheral side and the outer peripheral side of the crimping part. Can be bent.
Therefore, in the said end part welding, the butt | matching edge parts of a crimping | compression-bonding part can be welded firmly.

Here, in the crimping part bending process, it is sufficient that at least the outer peripheral side and the inner peripheral side are abutted at the butt end of the crimping part, but the ends are in contact with each other in the entire thickness direction, that is, the surface It is preferable to be in contact.
Moreover, the said edge part process process is not restricted to the both ends of the said crimping | compression-bonding part, but also includes the case where it performs only to at least one edge part among the both ends of the said crimping | compression-bonding part.

The present invention also provides an oxide film for removing an oxide film on a conductor exposed portion where the conductor is exposed by peeling off the insulating coating on the tip end side of a covered electric wire in which a conductor composed of a plurality of strands is coated with an insulating coating. An apparatus for removing oxide film, which performs an oxide film removal treatment , and oxidizes a molten solder tank for storing a solder solution and an ultrasonic vibration applied to a conductor exposed portion immersed in the solder solution stored in the molten solder tank. an ultrasonic vibration unit for coating removal, while performing oxidation film removal with respect to the conductor exposed portion, so that the conductor exposed portion in a desired shape that can be inserted into the crimping portion, the conductor exposed characterized in that the regulating means for regulating the intermediate position between the tip parts and the tip of the insulating coating is provided.

  The present invention provides a covered electric wire having a conductor exposed portion in which an insulating coating on the tip end side is peeled to expose a conductor composed of a plurality of strands, and is formed into a desired shape that can be inserted into the crimped portion by a regulating means. It is the covered electric wire provided with the conductor exposure part which removed the oxide film of the said some strand while regulating.

  As an aspect of the present invention, the restricting means can be formed of a restricting frame body in which an orthogonal cross section orthogonal to the electric wire longitudinal direction in the conductor exposed portion restricts to a circular cross section.

  In the crimping terminal, the crimping terminal includes a crimping portion formed in a cylindrical shape, and an end portion that abuts in the circumferential direction of the crimping portion is bent to a cylindrical shape, and the outer peripheral length and the inner length based on the thickness direction of the crimping portion. According to the difference in the peripheral length, the peripheral length in each part in the thickness direction is formed into an end shape that gradually decreases from the outer peripheral side toward the inner peripheral side, the conductor exposed portion in the above-described covered electric wire, It is an electric wire with a crimping terminal in which the crimping part into which the conductor exposed part is inserted is crimped and connected.

  According to the present invention, the crimp terminal includes a crimp part formed in a cylindrical shape, and the crimp part has a major axis and a minor axis perpendicular to the major axis in a cross section orthogonal to the terminal axis direction. Formed in a flat cross-sectional shape and formed so that the end portions butted against each other are located on one end side of the short axis, the conductor exposed portion in the above-described covered electric wire, and the crimping in which the conductor exposed portion is inserted It is the electric wire with a crimp terminal which crimp-connected the part.

  Further, the present invention includes a connection portion that allows connection with a connection partner member that is a connection partner of the crimp terminal on the side opposite to the crimp portion in the terminal axial direction of the crimp terminal, and the crimp terminal is connected to the connection portion. It is an electric wire with a crimp terminal that is formed so that the outer diameter is larger than the inner diameter of the crimping portion, and the conductor exposed portion in the above-described covered electric wire and the crimp portion where the conductor exposed portion is inserted are crimped. It is characterized by.

  According to the present invention, an electric wire with a crimping terminal capable of ensuring an excellent connection strength at the connection point, a method for producing the electric wire with a crimping terminal, and an oxide film removing apparatus, which have low electrical resistance at the connection point between the crimping part and the conductor exposed part Can be provided.

Structure explanatory drawing of an electric wire with a crimp terminal, a crimp terminal, and a covered wire. Sectional drawing of each part of an electric wire with a crimp terminal, a crimp terminal, and a covered wire. Structure explanatory drawing of an ultrasonic soldering apparatus. Explanatory drawing of 1 process of the ultrasonic soldering connection method. Explanatory drawing of 1 process of the ultrasonic soldering connection method. Sectional drawing of the aluminum conductor exposure part in the middle of performing ultrasonic soldering connection. Sectional drawing which shows the crimping | compression-bonding part before and behind the bending process which bends into a cylinder shape. It is explanatory drawing of a terminal welding process. Explanatory drawing which shows the relationship of the magnitude | size of a crimping | compression-bonding part and a connection part. Explanatory drawing of another bending process. The top view of the conducting wire holder which concerns on other embodiment. Explanatory drawing of a resistance welding apparatus. Explanatory drawing which shows the conventional crimping | compression-bonding part before and behind bending to a cylindrical shape.

An embodiment of the present invention will be described in detail with reference to the drawings.
Fig.1 (a) is a perspective view of the electric wire tip part 100T with a terminal of the electric wire 100 with a crimp terminal of this embodiment, FIG.1 (b) is a perspective view of the crimp terminal 300 and electric wire tip part 200T of this embodiment. There is shown a state immediately before the wire tip portion 200T is inserted into the crimp terminal 300.
2 (a) is a cross-sectional view taken along line AA in FIG. 1 (a), FIG. 2 (b) is a cross-sectional view taken along line BB in FIG. 1 (b), and FIG. It is CC sectional view taken on the line in FIG.1 (b).

  In FIGS. 1 and 2, the wire 210 a is thicker than the actual wire and the number of wires is smaller than that of the aluminum conductor 210 in order to facilitate recognition. Moreover, in FIG.2 (c), illustration of the electric wire front-end | tip part 200T is abbreviate | omitted.

  Here, in the following description, as shown in FIG. 1, the longitudinal direction X is a direction that coincides with the longitudinal direction of the covered electric wire 200 that crimps and connects the crimping part 322 and the axial direction of the crimping terminal 300. The width direction W corresponds to the width direction of the crimp terminal 300 and intersects the longitudinal direction X in the plane direction. In addition, in the longitudinal direction X, the side of the annular connecting portion 310 with respect to the electric wire connecting portion 320 is the front (front end side), and conversely, the side of the electric wire connecting portion 320 is rearward (the base end side) with respect to the annular connecting portion 310. It is said.

  The electric wire 100 with a crimp terminal of the present embodiment connects the covered electric wire 200 to the crimp terminal 300 as shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 (a), 2 (b), and 2 (c). Is configured. That is, the wire tip portion 200 </ b> T in the covered wire 200 is crimped and connected to the crimp portion 322 of the crimp terminal 300.

  The covered electric wire 200 to be crimped to the crimp terminal 300 is coated with the aluminum conductor 210 as an aluminum core wire formed by twisting a plurality of aluminum strands 210a, and has insulation and heat resistance, for example. And an insulating coating 220 made of PVC (polyvinyl chloride) material.

  As shown in FIG. 2B, the aluminum conductor 210 is composed of a plurality of strands 210a, and the plurality of strands 210a are arranged on the outer layer so as to be able to contact the inner peripheral surface of the crimping portion 322. The outer strand 210ao and the inner strand 210ai that contacts the neighboring strand 210a adjacent to the inner side of the outer aluminum conductor 210. The aluminum conductor 210 of the present embodiment is a so-called thick core wire of 20 sq (conductor outer diameter is 6.4 mm, conductor weight 55.3 g / m), for example. As a guide, the thickness of the aluminum conductor 210 is 16 sq or more. If so, the thickness is not particularly limited, and may be either a single wire or a stranded wire.

  The distal end side of the covered electric wire 200 is configured as an electric wire distal end portion 200T having an aluminum conductor exposed portion 210T in which the insulating conductor 220 on the distal end side is peeled to expose the aluminum conductor 210.

The crimp terminal 300 is a so-called round crimp terminal formed of copper or a copper alloy, and more specifically, on the distal end side in the longitudinal direction X, for example, a screw can be fastened to a connection counterpart such as a terminal block (not shown). An annular connecting portion 310 is formed in which a screw insertion hole 310a (see FIGS. 1A and 1B) that allows insertion is formed.
On the other hand, on the rear side (base end side) of the annular connection portion 310 in the longitudinal direction X of the crimp terminal 300, an electric wire connection portion 320 that can be crimp-connected to the electric wire distal end portion 200T is configured.

The wire connection part 320 is integrally formed in a continuous shape that is continuous in the entire circumferential direction along the longitudinal direction X while arranging the sealing part 321 and the crimping part 322 in this order from the front to the rear.
The sealing part 321 is deformed so as to crush the front end part of the electric wire connection part 320 into a substantially flat plate shape rather than the crimping part 322, so that the front end parts of the electric wire connection part 320 overlap each other in the plate thickness direction. It consists of.

  The crimping part 322 is formed in a hollow cylindrical shape in which the opening part 320A on the distal end side (see FIG. 8B) is closed by the sealing part 321 and the rear side is opened so that the electric wire distal end part 200T can be inserted. . The crimping portion 322 has a length that allows insertion of not only the aluminum conductor exposed portion 210T but also the tip portion of the insulating coating 220 behind the aluminum conductor exposed portion 210T in the wire tip portion 200T in a state where the wire tip portion 200T is inserted. It has a thickness.

  Subsequently, before connecting the crimping portion 322 of the crimping terminal 300 and the wire tip portion 200T, ultrasonic solder connection processing performed in a conductor end portion treatment step described later on the aluminum conductor exposed portion 210T in the wire tip portion 200T is performed. An ultrasonic soldering connection device 400 for application will be described with reference to FIG.

FIG. 3 is an explanatory diagram of the configuration of the ultrasonic soldering connection device 400 according to this embodiment. In FIG. 3 and FIGS. 4 and 5 described below, the molten solder 411 stored inside the molten solder rod 410 is shown. Is shown in a state where the front portion is transmitted. Also, the horizontal direction and the vertical direction with respect to the paper surface of FIGS. 3 to 5 are set to the width direction WD and the vertical direction YD of the ultrasonic soldering device 400, respectively .

  The ultrasonic solder connection device 400 includes a molten solder iron 410 that stores molten solder 411, an ultrasonic vibration unit 420 that applies ultrasonic vibration while being immersed in the molten solder 411, and an electric wire gripping unit 430 that grips the covered electric wire 200. And a conductor shape regulating unit 500 that regulates the aluminum conductor exposed portion 210T to a desired cross-sectional shape.

  The molten solder 411 stored in the molten solder bar 410 has good compatibility with the aluminum conductor 210 and has a lower melting point and corrosion resistance than the aluminum conductor 210, that is, Sn—Zn-based solder containing Zn which is a metal having a low standard electrode potential. Or Zn-Al solder.

  In this manner, the oxide film on the surface of the aluminum wire 210a constituting the aluminum conductor 210 immersed in the Sn-Zn-based or Zn-AL-based molten solder 411 having good compatibility with the aluminum conductor 210 can be removed. .

The wire gripping unit 430 includes a wire end side gripping portion 440D and a wire base side gripping portion 440U.
The wire end side gripping portion 440D is a wire gripping portion provided on the lower side of the two wire gripping portions (440D, 440D) arranged on the upper and lower sides in FIG. A fixed grip portion 441D for holding 220 and an elevating support arm 442D for supporting the fixed grip portion 441D so as to be movable up and down.

  The electric wire base side holding portion 440U is an electric wire holding portion provided on the upper side of the two electric wire holding portions (440D, 440D) arranged on the upper and lower sides in FIG. 3, and guides the electric wire so as to be slidable in the vertical direction. The upper and lower slide guide gripping portion 441U that grips in this state and the fixed support arm 442U that supports the upper and lower slide guide gripping portion 441U at a fixed position.

  The ultrasonic vibration unit 420 includes an ultrasonic vibration jig 421 and an ultrasonic generator (not shown), and the ultrasonic vibration jig 421 extends from the ultrasonic generator outside the molten solder iron 410.

  The ultrasonic vibration jig 421 is provided with a wire pressing portion 421A that is bent in a flat shape so as to be pressed against the tip end of the aluminum conductor exposed portion 210T on the tip end side in the longitudinal direction, and the wire pressing portion 421A is melted. The aluminum conductor exposed portion 210T is disposed so as to be opposed to the tip side of the aluminum conductor exposed portion 210T while being immersed in the solder 411.

  Furthermore, the ultrasonic vibration unit 420 is formed so that the electric wire pressing part 421A can be raised against the tip of the aluminum conductor exposed part 210T, or the ultrasonic vibration jig 421 can be raised and lowered so that it can be retracted to the original position. ing.

The conductor shape restriction unit 500 includes a conductor shape restriction frame 510 and a slide support arm 520 that slides the conductor shape restriction frame 510 in the apparatus width direction WD.
The conductor shape restricting frame 510 is composed of a pair of restricting frame portions 511 arranged on both sides of the aluminum conductor exposed portion 210T in the apparatus width direction WD so as to face each other across the aluminum conductor exposed portion 210T. Yes.
Note that the base side of the conductor shape regulating frame 510 is detachably attached to the distal end portion of the slide support arm 520.

  The front end side of the conductor shape restricting frame 510 has an outer peripheral shape of the aluminum conductor exposed portion 210T in a state where the pair of restricting frame portions 511 face each other so as to sandwich the aluminum conductor exposed portion 210T from both sides in the apparatus width direction WD. Each is formed in a semicircular shape so as to have a corresponding semicircular shape in plan view (see FIG. 6A).

The slide support arm 520 is configured to be slidable in the apparatus width direction WD by a driving means (not shown) so that the pair of restriction frame portions 511 can be moved close to or separated from the aluminum conductor exposed portion 210T.
Next, a method for manufacturing the covered electric wire 200 will be described. The electric wire manufacturing method peels off the insulating coating 220 at the end of the covered electric wire 200 to expose the aluminum conductor 210, removes the oxide film on the surface of the wire 210a constituting the aluminum conductor exposed portion 210T, and solders it. The conductor end portion processing step is performed in this order.

The conductor end portion treatment process will be described in detail with reference to FIGS.
4 (a), 4 (b), and 5 (a) are explanatory diagrams for sequentially explaining each step of the ultrasonic soldering method, and FIG. 5 (b) is a diagram in FIG. 5 (a). It is an enlarged view of X1 part.

  First, as shown in FIG. 3, the rear portion of the covered electric wire 200 from the exposed portion 210T of the aluminum conductor 210T is grasped by the electric wire end side holding portion 440D and the electric wire tip 200T of the covered electric wire 200 from the electric wire tip 200T. Also, the rear portion is gripped by the wire base side gripping portion 440U. Thereby, the aluminum conductor exposed portion 210T is set in a state facing the liquid surface of the molten solder 411 above the molten solder rod 410.

As shown in FIG. 4A, the lifting support arm 442D is gradually lowered to a predetermined position where the entire aluminum conductor exposed portion 210T is immersed in the molten solder 411.
As shown in FIG. 4B, the pair of slide support arms 520 are slid so that the pair of restriction frame portions 511 are close to each other in the apparatus width direction WD. As a result, as shown in FIG. 6B, the aluminum conductor exposed portion 210T is held by the pair of restricting frame portions 511 so as to be sandwiched from both sides in the apparatus width direction WD, thereby forming the shape of the aluminum conductor exposed portion 210T. Restrict from both sides of the apparatus width direction WD.

  As shown in FIG. 5A, the ultrasonic vibration jig 421 is raised with the aluminum conductor exposed portion 210T immersed in the molten solder 411, and the wire pressing portion 421A is pushed to the tip of the aluminum conductor exposed portion 210T. Hit it.

  Then, as shown in FIGS. 5 (b) and 6 (a), the conductor shape restricting frame 510 allows the aluminum conductor exposed portion 210T to be removed from the wire pressing portion 421A in a state where the orthogonal cross section is restricted to a circular shape. Ultrasonic vibration can be directly applied to the aluminum conductor exposed portion 210T, and not only the surface of the aluminum conductor exposed portion 210T but also the elements constituting the aluminum conductor exposed portion 210T as shown in FIG. The molten solder 411 can also penetrate into the gap between the wires 210a.

  Thereby, among the plurality of strands 210a constituting the aluminum conductor 210, the molten solder 411 is attached not only to the surface of the outer strand 210ao but also to the surface of the inner strand 210ai, and the strands 210a can be bundled. it can.

Next, a method for manufacturing the crimp terminal 300 will be described with reference to FIGS.
7A is a cross-sectional view of the wire connection portion corresponding portion 320Z showing a state of bending into a cylindrical shape, and FIG. 7B is an enlarged view of a portion X2 in FIG. 7A. 7 (c) is an enlarged view of a portion X3 in FIG. 7 (a).

FIG. 8 is an explanatory diagram of the terminal welding process. Specifically, FIG. 8A is an explanatory diagram viewed from the plane of the crimp terminal 300 in which the end portions 320a and 320a butted together in the electric wire connecting portion 320 are welded together. FIG. 8B is a cross-sectional view taken along the line F-F in FIG. FIG.8 (c) is the GG sectional view taken on the line in Fig.8 (a).
Figure 9 is a plan view showing the relationship between the outer diameter phi _D310 inner diameter phi _D322 and the annular connecting portion 310 of the wire connecting portion 320.

  The manufacturing method of the crimp terminal 300 is an end portion for cutting the end portions 320a and 320a in the width direction W of the wire connection portion equivalent portion 320Z of the plate-like terminal base material 300Z obtained by punching a copper strip into a terminal shape. Processing step, bending step of bending the wire connection portion corresponding portion 320Z into a cylindrical shape, laser welding step of laser welding the ends 320a, 320a opposed to each other in the circumferential direction, and the tip of the wire connection portion 320 And a sealing part forming step of sealing the opening on the tip end side in this order.

  In the end portion machining step, the outer peripheral equivalent surface 320Zo is more than the inner peripheral equivalent surface 320Zi of the flat wire connection portion equivalent portion 320Z, as shown by the phantom line in FIG. 7B. Both end portions 320a and 320a in the width direction W are cut into end face shapes inclined in the thickness direction so as to be wide.

  Here, the inner circumferential equivalent surface 320Zi is a surface corresponding to the inner circumferential surface of the electric wire connection portion 320 (the electric wire connection portion equivalent portion 320Z) in a state where the electric wire connection portion equivalent portion 320Z is bent into a cylindrical shape. The outer peripheral equivalent surface 320Zo is a surface corresponding to the outer peripheral surface of the wire connecting portion 320 (wire connecting portion equivalent portion 320Z) in the same state.

  In the bending step, a cylindrical core rod (not shown) is disposed along the longitudinal direction X of the wire connection portion corresponding portion 320Z and the wire connection portion corresponding portion along the outer peripheral surface of the core rod around the axis of the core rod 320Z is bent into a cylindrical shape. At this time, as shown in FIGS. 7A and 7C, the end portions 320a and 320a of the wire connection portion corresponding portion 320Z abut each other in the circumferential direction.

  In the laser welding process, as shown in FIG. 8, the end portions 320 a and 320 a abutted in the circumferential direction of the cylindrical wire connecting portion corresponding portion 320 </ b> Z are welded along the longitudinal direction X in the sweep direction from the rear to the front.

Specifically, as shown in FIGS. 8B and 8C, the fiber laser irradiated from the fiber laser welding apparatus Fw to the end portions 320a and 320a which are abutted in the circumferential direction of the cylindrical wire connecting portion equivalent portion 320Z. The beam is focused, and as shown in FIGS. 8A and 8B, the butted ends 320a and 320a are welded in a straight line from the rear in the longitudinal direction X of the wire connection portion corresponding portion 320Z to the front.
Thereby, the electric wire connection part equivalent location 320Z can be comprised as the cylindrical electric wire connection part 320. FIG.

  The sweep direction of the fiber laser welding apparatus Fw is not limited to the direction from the rear to the front as long as it is one direction along the longitudinal direction X, and may be the sweep direction from the front to the rear.

  The method of welding the ends 320a and 320a is not limited to the fiber laser as long as it is the above-mentioned high energy density beam. For example, a YAG laser, a laser beam by a disk laser, or an electron beam may be used. .

  In the sealing portion forming step, the opening 320A (see FIG. 8B) on the distal end side of the wire connecting portion 320 is sealed by a pair of compression molds (not shown) composed of an upper mold (crimper) and a lower mold (anvil). It compresses until it stops, and forms the sealing part 321 in the front-end | tip part of the electric wire connection part 320. FIG.

By the above, it is possible to form a crimp terminal 300, the crimp terminal 300, as shown in FIG. 9, so that the outer diameter phi _D310 annular connecting portion 310 is larger than the inner diameter phi _D322 crimping portion 322 Forming.
The electric wire 100 with a crimp terminal is manufactured by performing the electric wire insertion step and the crimp step in this order using the crimp terminal 300 and the covered electric wire 200 manufactured as described above.

  In the electric wire insertion step, the aluminum conductor exposed portion 210T of the covered electric wire 200 is slightly abutted against the inner wall on the tip side inside the crimp portion 322 through the opening 322A (see FIG. 9) through the cylindrical crimp portion 322 of the crimp terminal 300 described above. Insert until

In the crimping step, the aluminum conductor exposed part 210T and the crimping part 322 in a state where the aluminum conductor exposed part 210T is inserted are crimped by a pair of crimping molds (not shown) composed of an upper mold and a lower mold.
As described above, the electric wire 100 with the crimp terminal as shown in FIG. 1A can be manufactured.

Then, the effect about the manufacturing method of the electric wire 100 with a crimp terminal mentioned above and the electric wire 100 with a crimp terminal is demonstrated.
According to the method for manufacturing the covered electric wire 200 described above, the aluminum conductor exposed portion 210T can be inserted into the crimping portion 322 when performing the ultrasonic solder connection process on the aluminum conductor exposed portion 210T in the conductor end portion processing step. It can be regulated by the conductor shape regulating frame 510 so as to have a desired shape.

  For this reason, in the conductor end portion processing step, for example, the aluminum conductor exposed portion 210T is immersed in the molten solder 411 stored in the molten solder iron 410, or the ultrasonic vibration jig 421 is pressed against the aluminum conductor exposed portion 210T. When the portion 421A is pressed or ultrasonic vibration is applied through the molten solder 411, the strand 210a in the aluminum conductor exposed portion 210T is unwound or bent to deform the length of the aluminum conductor exposed portion 210T. The cross section orthogonal to the direction X is not deformed from a circular shape to an oval shape, and the conductor shape regulating frame 510 regulates the aluminum conductor exposed portion 210T in a circular shape that can be inserted into the crimping portion 322. Can do.

  For this reason, even if the aluminum conductor exposed portion 210T is, for example, a so-called thick core wire of 16 sq or more, ultrasonic solder connection processing can be appropriately performed on the aluminum conductor exposed portion 210T without being deformed. Therefore, the oxide film on the surface of the strand 210a can be reliably removed to reduce and stabilize the electrical resistance.

Furthermore, even if the aluminum conductor exposed portion 210T is a so-called thick core wire as described above, the aluminum conductor exposed portion 210T is inserted smoothly into the crimping portion 322 with good appearance in the wire insertion process. Can do.
In addition, since the aluminum conductor exposed portion 210T does not lose its shape, the aluminum conductor exposed portion 210T can be crimped in a properly disposed state with respect to the crimping portion 322 in the crimping process, and the aluminum conductor exposed portion 210T and the crimping portion 322 can be firmly attached. And can be pressure-bonded in close contact.

In particular, when compressing the coated electric wire 200, in order to remove the oxide film on the surface of the strand 210a of the aluminum conductor exposed portion 210T, the compression ratio (the cross-sectional area of the crimp portion 322 after compression / the crimp portion 322 before compression) It is not necessary to set the cross-sectional area x 100) to about 40%, for example, and normal crimping of 60% to 70% is sufficient, so that the strand 210a constituting the aluminum conductor 210 is cut along with compression. Without being generated, the crimping part 322 and the aluminum conductor exposed part 210T can be crimped and connected.
Therefore, the electric wire 100 with a crimp terminal having low electrical resistance and excellent strength can be efficiently manufactured.

  Further, in the conductor end portion processing step, as described above, ultrasonic solder connection processing is performed in which ultrasonic vibration is applied to the aluminum conductor exposed portion 210T while the aluminum conductor exposed portion 210T is immersed in the molten solder 411. Thus, cavitation (bubbles) can be generated in the molten solder 411, and the oxide film on the surface of the strand 210a of the aluminum conductor exposed portion 210T is strongly strengthened by a cavitation effect using a shock wave generated by the bursting of the bubbles. Can be peeled off.

  Furthermore, compared with the case where the aluminum conductor exposed portion 210T is simply immersed in the molten solder 411, the molten solder 411 can be spread between the wires 210a constituting the aluminum conductor exposed portion 210T, and the aluminum conductor exposed portion 210T. The inner strands 210ai can be connected to each other via the molten solder 411, and the outside of the aluminum conductor exposed portion 210T is connected to the crimping portion 322 by Sn adhesion. Can be connected firmly.

  Moreover, according to the manufacturing method of the crimp terminal 300 of the present embodiment, in the end portion processing step, as described above, in FIG. 7A and FIG. As described above, both end portions 320a and 320a in the width direction W of the wire connection portion corresponding portion 320Z are arranged in the thickness direction so that the outer peripheral equivalent surface 320Zo is wider than the inner peripheral equivalent surface 320Zi of the flat wire connection portion corresponding portion 320Z. It is cut into an end face shape that is slanted.

  As a result, as shown in FIG. 7C, the end portions 320a and 320a abutted in the circumferential direction of the wire connection portion corresponding portion 320Z, as well as the end portion 320ai in the width direction W of the inner peripheral equivalent surface 320Zi, of course. Since it can be contacted in the entire thickness direction including the end portion 320ao of the outer peripheral equivalent surface 320Zo, it can be firmly welded in the laser welding process.

  More specifically, the end machining step is performed on the end in the width direction W of the wire connection portion equivalent portion 3200Z as in the conventional wire connection portion equivalent portion 3200Z shown in FIGS. 13 (a) and 13 (b). When the non-wire connection portion equivalent part 3200Z is bent into a cylindrical shape, as shown in FIGS. 13A and 13C, due to the influence of the thickness of the wire connection part equivalent part 320Z, the cylindrical wire connection part equivalent place At the end portion 3200a of 3200Z, only the inner side in the plate thickness direction (radial direction) abuts, and a gap Δd is generated as it proceeds to the outer side in the plate thickness maintaining direction.

  In particular, a crimp terminal that is crimp-connected to a so-called thick aluminum conductor exposed portion 210T having an electric wire size of, for example, 20 sq, that is, a finishing outer radius larger than 8.6 mm, is, for example, thinner than 16 sq. Often, a thicker terminal is used than a crimp terminal used for crimping a core wire.

Thus, when the plate thickness of the crimp terminal is thick, the end portions 3200a and 3200a of the wire connection portion corresponding portion 3200Z are particularly circumferentially affected by the influence of the plate thickness of the wire connection portion corresponding portion 320Z. When the bending process is performed so as to face each other, the opposing end portion of the wire connection portion equivalent portion 3200Z is in a state of being abutted on the inner peripheral side, but a large gap is easily generated on the outer peripheral side.
If it does so, the subject that the edge parts 3200a and 3200a of the electric wire connection part equivalent location 3200Z cannot be welded will arise in a laser welding process.

  In addition, Fig.12 (a) is sectional drawing of the conventional electric wire connection part equivalent location 3200Z which shows a mode that bending is carried out to a cylinder shape. 12B is an enlarged view of a portion X7 in FIG. 12A, and FIG. 12C is an enlarged view of a portion X8 in FIG. 12A.

On the other hand, in the present embodiment, as described above, as shown in FIG. 7B, the difference between the outer peripheral length and the inner peripheral length generated based on the thickness of the wire connection portion corresponding portion 320Z is taken into consideration. In addition, in the end portion machining step, the both end portions 320a and 320a in the width direction W are inclined in the thickness direction so that the outer peripheral equivalent surface 320Zo is wider than the inner peripheral equivalent surface 320Zi of the flat wire connection portion corresponding portion 320Z. 7A and 7C, when the wire connection portion equivalent portion 320Z is bent, the ends 320a and 320a of the wire connection portion equivalent portion 320Z are connected to each other as shown in FIGS. 7 (a) and 7 (c). It can be bent into a state of being abutted not only on the peripheral side but also on the outer peripheral side.
Therefore, the end portions 320a and 320a of the wire connecting portion 320 can be firmly welded in the laser welding process.

In correspondence between the configuration of the present invention and the above-described embodiment,
The conductor of the present invention corresponds to the aluminum conductor 210,
Similarly,
The conductor exposed portion corresponds to the aluminum conductor exposed portion 210T,
The connecting portion corresponds to the annular connecting portion 310,
The crimping part before crimping corresponds to the wire connection part equivalent part 320Z,
The outer peripheral side of the crimping part before bending corresponds to the outer peripheral equivalent surface 320Zo,
The inner peripheral side of the crimping part before bending corresponds to the inner peripheral equivalent surface 320Zi,
The restriction frame corresponds to the conductor shape restriction frame 510 and conductor shape restriction frames 510A1, 510A2, 510B1, 510B2 described later,
The oxide film removing apparatus corresponds to the ultrasonic solder connecting apparatus 400 and the resistance welding apparatus 600 described later,
The terminal axis direction corresponds to the longitudinal direction X,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, the regulation frame of the present invention is not limited to the shape described above, and can be formed in various embodiments.
Specifically, the manufacturing method of the crimp terminal according to the present invention does not limit the above-described end portion processing step to the wire connection portion corresponding portion 320Z of the terminal base material 300Z, and the bending step includes a cylindrical shape. Any other method may be used as long as it can be bent so that the ends 320a and 320a of the wire connection portion equivalent portion 320Z bent into the shape are in contact with each other.

  For example, without performing the end portion machining step on the wire connection portion equivalent portion 320Z of the terminal base material 300Z, the wire connection is performed in the bending step as in the wire connection portion equivalent portion 320Z shown by the one-dot chain line in FIG. The portion corresponding to the portion 320Z is bent into a cylindrical shape, and then the butt end portions 320a and 320a in the circumferential direction of the portion corresponding to the cylindrical wire connection portion 320Z shown in FIG. May be subjected to a two-stage bending process in which the sheet is pressed into the center of the orthogonal cross section and bent into an elliptical shape.

  By performing such a two-stage bending process, the end portions 320a and 320a of the wire connection portion corresponding portion 320Z can be brought into contact with each other in a state of surface contact with each other.

  9A is a cross-sectional view of the wire connection portion equivalent portion 320Z showing a state of processing from a flat shape to an elliptical shape, and FIG. 9B is an enlarged view of a portion X4 in FIG. 9A. 9C is an enlarged view of a portion X5 in FIG. 9A, and FIG. 9D is an enlarged view of a portion X6 in FIG. 9A.

  More specifically, even if the wire connection portion equivalent portion 320Z can be bent into a cylindrical shape by the first bending process among the two stages of bending processes described above, there is a gap on the outer side in the thickness direction at the butted ends 320a and 320a. (Refer to FIG. 10 (c)), as shown in FIG. 10 (a), by bending the end portions 320a and 320a in the circumferential direction of the wire connection portion corresponding portion 320Z toward the center of the cross section, The connecting portion equivalent portion 320Z can be formed into an elliptical shape, and can be bent so that the end portions 320a and 320a are located at one end portion in the minor axis direction of the elliptical shape.

By the above-described two-stage bending process, the end portions 320a and 320a come close to each other in the circumferential direction as the wire connecting portion corresponding portion 320Z is pressed from a circular shape to an elliptical shape, and the gap between the end portions 320a and 320a is eliminated. Then, as shown in FIG. 10D, the butted ends 320a and 320a can be brought into contact with each other in the entire thickness direction.
Therefore, the end portions 320a and 320a of the wire connecting portion 320 can be firmly welded in the laser welding process.

  In addition, according to the bending method of bending into the above-described elliptical shape (flat shape), the wire connection portion corresponding portion 320Z, as described above, the both end portions 320a and 320a in the width direction W of the wire connection portion corresponding portion 320Z. It is not necessary to perform an end machining step for cutting the wire into an end surface shape inclined in the thickness direction, and the wire connection portion equivalent portion 320Z after bending is bent into an elliptical shape by, for example, compressing with a compression die or the like. The end portions 320a and 320a of the wire connection portion corresponding portion 320Z can be easily brought into close contact with each other in the entire thickness direction.

  Moreover, the shape which bends the electric wire connection part equivalent location 320Z is not specifically limited if it is a shape where end parts 320a and 320a face each other, such as an ellipse shape, not only an elliptical cross section.

  Further, as another embodiment of the bending method for bending into the above-described elliptical shape (flat shape), when bending the flat wire connection portion equivalent portion 320Z into a flat shape, as described above, the flat shape This is not limited to the stepwise bending process in which the wire connection portion equivalent part 320Z is bent into a cylindrical shape and then bent into a flat shape. For example, the wire connection portion equivalent portion 320Z is bent from a flat state into a flat shape at a stretch as shown by a solid line in FIG. 10A, as indicated by a virtual line in FIG. You may go.

Further, the conductor shape restriction frame 510 provided in the conductor shape restriction unit 500 is not limited to the shape described in the above-described embodiment, and may be formed in other shapes.
Specifically, as shown in FIGS. 11A and 11B, the conductor shape restriction frame body provided in the conductor shape restriction unit 500 can be restricted so that the orthogonal cross section of the aluminum conductor exposed portion 210T is elliptical. Alternatively, it may be formed in an elliptical shape.

  The conductor shape restricting frame 510A1 shown in FIG. 11A is disposed so as to face each other along the elliptical long axis direction so as to be close to or away from each other, and the end portions of the conductor shape regulating frame body 510A1 protrude from both ends in the short axis direction. A pair of restriction frame portions 511A1 formed in a semi-elliptical shape so as to be combined are provided.

  The conductor shape regulating frame 510A2 shown in FIG. 11 (b) is disposed opposite to each other along the elliptical minor axis direction so as to be close to or separable from each other, and at both ends in the major axis direction of the elliptical shape, end portions of each other. A pair of regulation frame portions 511A2 formed in a semi-elliptical shape so as to face each other are provided.

  Further, the conductor shape regulating frame provided in the conductor shape regulating unit 500 is long as shown in FIGS. 11C and 11D so that the orthogonal cross section of the aluminum conductor exposed portion 210T can be regulated to be an oval shape. You may form in a circular shape.

  Specifically, the conductor shape regulating frame 510B1 shown in FIG. 11 (c) is disposed opposite to each other so as to be close to or away from each other along the major axis direction of the ellipse, and at both ends in the minor axis direction, A pair of regulation frame portions 511B1 formed in a semi-oval shape so that the portions face each other are provided.

  The conductor shape regulating frame 510B2 shown in FIG. 11 (d) is arranged opposite to each other along the oval short axis direction so as to be close to or separated from each other, and at both ends of the oval long axis direction, A pair of regulation frame portions 511B2 formed in a semi-oval shape so that the portions face each other are provided.

  For example, when the aluminum conductor exposed portion 210T is formed with an elliptical cross section, the conductor shape regulating frame 510A1 shown in FIG. 11A or the conductor shape regulating frame 510A2 shown in FIG. Can be formed.

  Accordingly, in the conductor end portion processing step, the pair of restriction frame portions 511A1 or the pair of restriction frame portions 511A2 formed in an elliptical shape is used to firmly restrict the orthogonal cross section of the aluminum conductor exposed portion 210T to an elliptical shape. can do.

  Since the aluminum conductor exposed portion 210T has an elliptical cross section, the aluminum conductor exposed portion 210T can be smoothly inserted into the elliptical cylindrical crimp portion 322 in the electric wire inserting step, and the aluminum conductor exposed portion 210T in the crimping step. Can be crimped in a state where the crimping part and the crimping part are in close contact with each other.

  In addition, as described above, the method of manufacturing the electric wire with crimp terminal according to the present invention is not limited to the ultrasonic solder connection process in which the aluminum conductor exposed portion 210T is immersed in the molten solder 411 and ultrasonic waves are applied. You may perform the conductor edge part process process of the other method with respect to the part 210T.

For example, you may perform a conductor edge part process process by resistance welding using the resistance welding apparatus 600 as shown in FIG.
The resistance welding apparatus 600 includes a pair of electrodes 610A and 610B, an energization unit 620, and an energization detection circuit 630. Further, the resistance welding apparatus 600 includes an electric wire gripping unit 430 that grips the aluminum conductor exposed portion 210T and a conductor shape restricting frame 510P including a pair of restricting frame portions 511P as the conductor shape restricting unit 500P.
The pair of restriction frame portions 511 is configured to be swingable in a state where the shape of the aluminum conductor exposed portion 210T is restricted or a state where the aluminum conductor exposed portion 210T is retracted without restriction.

  The energization unit 620 is configured to supply a current from the power source E to energize a current necessary for resistance welding the welded portion of the aluminum conductor exposed portion 210T between the pair of electrodes 610A and 610B. The energization detection circuit 630 is configured to detect that the aluminum conductor exposed portion 210T has been brought into contact with the energized state.

When resistance welding is performed using the resistance welding apparatus 600, the contact point of one electrode 610A and the other electrode 610B of the pair of electrodes 610A and 610B with the aluminum conductor exposed portion 210T gripped by the wire gripping unit 430. Are pressed horizontally from both sides against the aluminum conductor exposed portion 210T, and the energization detecting circuit 630 detects that the pair of electrodes 610A and 610B are in contact with the aluminum conductor exposed portion 210T, the energizing unit 620 It operates and energizes between a pair of electrodes 610A and 610B. Thereby, the aluminum conductor exposed portion 210T pressed by the pair of electrodes 610A and 610B generates heat and is welded.
By the resistance welding described above, the strands 210a of the aluminum conductor exposed portion 210T are connected to each other, and electrical conductivity between the strands 210a can be ensured.

  Furthermore, since the resistance welding apparatus 600 includes the conductor shape regulating unit 500P, even if the aluminum conductor exposed portion 210T is pressed from both sides by the pair of electrodes 610A and 610B as described above, the aluminum conductor exposed portion 210T is a mold. It can be regulated to a desired shape without collapsing.

  Further, the regulating means of the present invention is not limited to the configuration described above. For example, the position in the wire axial direction (longitudinal direction X) when the aluminum conductor exposed portion 210T is gripped by the conductor shape restricting frame is, for example, the wire pressing portion 421A provided in the ultrasonic solder connection device 400 described above, It is preferable that the distal end side of the pair of electrodes 610A and 610B provided in the resistance welding device 600 is pressed from the position where the electrodes are pressed against the aluminum conductor exposed portion 210T.

  Thereby, even if the wire pressing part 421A and the pair of electrodes 610A and 610B are pressed against the aluminum conductor exposed part 210T, the shape of the aluminum conductor exposed part 210T is surely and efficiently regulated by the conductor shape regulating frame. Can do.

  However, the position where the aluminum conductor exposed portion 210T is gripped by the conductor shape regulating frame is not limited to the distal end side of the Lumi conductor exposed portion 210, and is not particularly limited to the proximal end side. Furthermore, it is not limited to gripping one place in the axial direction of the aluminum conductor exposed portion 210T, and a plurality of places may be disposed so as to be gripped. The conductor shape restricting frame 510 is not limited to restricting the shape of the aluminum conductor exposed portion 210T by a pair of restricting frame portions 511 formed of two members, and may be configured to include one or more than three.

  Moreover, the crimp terminal of this invention may comprise the electric wire connection part 320 only by the crimp part 322 without providing the sealing part 321. FIG. That is, the structure which the front end side of the electric wire connection part 320 opened may be sufficient.

  The connection part of the present invention is not limited to the annular connection part 310, and is not particularly limited as long as the connection part can be connected to the other side, such as a U-shape protruding toward the tip. Further, the crimp terminal 300 may be configured only by the wire connection portion 320 without including the annular connection portion 310 and by bundling and connecting the aluminum conductors 201 of the plurality of covered wires 200.

  Further, in the ultrasonic soldering connection device 400 described above, cooling air is applied to the aluminum-aluminum conductor 210 pulled up from the state immersed in the molten solder 411 between the fixed support arm 442U and the molten solder rod 410. You may provide a ventilation part.

  In addition, the ultrasonic soldering connection device 400 is connected to the aluminum conductor exposed portion 210T via the molten solder 411 in a non-contact state where the wire pressing portion 421A is not brought into contact with the aluminum conductor exposed portion 210T but is brought close to the aluminum conductor exposed portion 210T. On the other hand, ultrasonic vibration may be applied. Further, the ultrasonic soldering device 400 does not include the ultrasonic vibration jig 421, but directly applies ultrasonic vibration to the molten solder 411 by the ultrasonic generator provided in the molten solder iron 410, and the molten solder Ultrasonic vibration may be applied to the aluminum conductor exposed portion 210T via 411.

DESCRIPTION OF SYMBOLS 100 ... Electric wire 200 with a crimp terminal ... Coated electric wire 210 ... Aluminum conductor 210T ... Exposed aluminum conductor 210a ... Element wire 220 ... Insulation coating 300 ... Crimp terminal 310 ... Ring connection part 320a ... End part 320Z ... Wire connection part equivalent location 320Zo ... outer peripheral corresponding surface 320Zi ... inner peripheral corresponding surface 322 ... crimping portion 400 ... inner diameter of the ultrasonic solder connection device 510,510A1,510A2,510B1,510B2 ... conductor shape regulating frame body 600 ... resistance welding system phi _{D322 ...} wire connecting portion phi _D310 ... Outer diameter of annular connection

Claims (4)

Manufacture of an electric wire with a crimping terminal in which a conductor exposed portion where the conductor is exposed by peeling off the insulating coating on the tip side of the coated electric wire in which a conductor composed of a plurality of strands is coated with an insulating coating is crimped to the crimping portion of the crimping terminal A method,
A wire end treatment step for the conductor exposed portion;
An electric wire insertion step of inserting the conductor exposed portion into the crimp portion formed into a cylindrical shape;
A crimping step of crimping the conductor exposed portion and the crimping portion is performed in this order,
The electric wire end portion processing step, the exposed conductor portion into a desired shape that can be inserted into the crimp portion, the regulating means an intermediate position between the tip of the insulating coating and the tip of the exposed conductor portion A method of manufacturing an electric wire with a crimping terminal, which is performed by ultrasonic soldering that regulates and applies ultrasonic vibration to the exposed conductor in a state where the exposed conductor is immersed in a solder solution . The regulating means,
The manufacturing method of the electric wire with a crimp terminal of Claim 1 formed with the control frame which the orthogonal cross section orthogonal to the line longitudinal direction in the said conductor exposed part controls to circular shape. Prior to the wire insertion step, the crimped portion bending process for bending the crimped portion into a cylindrical shape so that the ends of the crimped portion meet in the circumferential direction and the butted end portions are integrally welded together. End welding and in this order,
Before the crimping part bending process, according to the difference between the outer circumference length and the inner circumference length based on the thickness of the crimping part, the circumferential length of each part in the thickness direction of the crimping part is The crimp terminal according to claim 1 or 2, wherein an end machining step is performed on the end of the crimp section before bending so as to have an end shape that gradually decreases from the outer circumference side toward the inner circumference side. Electric wire manufacturing method. An oxide film removing apparatus for performing an oxide film removing process on a conductor exposed portion where the conductor is exposed by peeling off the insulating coating on the tip side of a covered electric wire in which a conductor composed of a plurality of wires is coated with an insulating coating. ,
A molten solder bath for storing a solder solution for performing an oxide film removing process;
An ultrasonic vibration unit for removing an oxide film by applying ultrasonic vibration to a conductor exposed portion immersed in the solder solution stored in the molten solder tank;
While performing an oxide film removal removed by relative to the exposed conductor portions, the conductor exposed portion into a desired shape that can be inserted into the crimping portion, and the tip of the insulation coating and the tip of the exposed conductor portion oxide film removal apparatus and regulating means for regulating the intermediate position is provided between the.

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