JP2014164929A - Terminal for wire, wire with terminal, and method of manufacturing wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimp terminal, and the like, having a tubular crimp portion capable of reducing contact resistance of the conductor of wire and the crimp terminal sufficiently while enhancing the yield.SOLUTION: A terminal for wire 100 includes a tubular crimp portion 30 having an insertion port for inserting a wire. The tubular crimp portion 30 has a thick wall part on the surface in contact with the wire. A recess 32 or a protrusion 33 is formed in the thick wall part on the surface in contact with the wire. The recess 32 or protrusion 33 functions as a serration for deforming the wire when it is crimped to the terminal for wire.

Description

  The present invention relates to an electric wire terminal, an electric wire with the terminal, and a method for manufacturing the electric wire with the terminal, and in particular, a cylindrical shape having an insertion port for inserting at least one electric wire as a conductor. The present invention relates to a terminal for electric wires provided with a cylindrical crimping part made of a plate-like base material made of a conductive material, a wire with the terminal, and a method for manufacturing the electric wire with the terminal.

  2. Description of the Related Art Conventionally, in a wire connecting portion in an automotive assembled wire, a form in which a wire as a conductor is crimped to the wire terminal by crimping the wire with the wire terminal is common. Usually, copper or copper alloy wires are used as the assembled wires, but aluminum or aluminum alloy wires (aluminum wires) may be used for weight reduction. Generally, the crimping portion has a structure (open barrel) where the electric wire is exposed. For example, when an aluminum electric wire is used as the conductor, the conductor aluminum or aluminum alloy is exposed, and as a result, the conductor itself may be corroded. In order to prevent this, it is desirable to shield the aluminum wire from the outside.

  In order to reliably prevent the conductor from being corroded, it is conceivable to employ a method (for example, see Patent Document 1) in which the entire crimped portion is molded with resin. However, when molding is employed, the size of the connector housing is increased by the molded portion, and therefore the entire assembled wire cannot be reduced in size. Moreover, since it processes with respect to each crimping | compression-bonding part in crimping | molding, there exist the subject that the number of processes of manufacture of an assembled wire increases greatly, the subject that an operation | work is complicated, etc.

  For the purpose of solving the above-described problems, a technique for shielding an aluminum electric wire from the outside by pressing the metal member after covering the aluminum electric wire with two metal members (cans) formed into a cylindrical shape (for example, Patent Document 2). However, in such a technique, it is troublesome to attach a conductor to each can before crimping, and if the can is damaged by a wire barrel (crimping piece) at the time of crimping, it becomes a wire terminal. There is a problem that an inundation route occurs.

  In order to solve at least one of the above problems, a technique is adopted in which an electric wire is inserted into one cylindrical metal member and the member is pressed (caulked) from the side of the member. It is possible to do. Thereby, an electric wire can be shielded from the external world, without enlarging a crimping | compression-bonding part. In addition, as a method of forming a cylindrical crimping member, a method of butting the lip portions of a pair of barrels and welding the butted portions, a method of integrally forming a tube by deep drawing, and processing a plate-like substrate into a cylinder However, a method (laser welding) or the like of welding a part where both end portions of the plate-like base material are close or in contact with each other by laser welding is known, but from the viewpoint of processing speed and cost, It is preferred to use laser welding.

  Although several methods for forming the cylindrical crimp member are known, it is preferable to use laser welding from the viewpoint of processing speed and cost.

  By the way, Patent Documents 3 and 4 are all related to a so-called open barrel type crimp terminal, and it aims at both ensuring the mechanical strength of the crimp terminal and reducing the contact resistance between the conductor of the wire and the crimp terminal. As described above, a technique is disclosed in which a concave portion is formed inside the crimp terminal and a folded portion is provided at a location where the concave portion of the crimp terminal is not formed.

  Further, Patent Document 5 relates to an open barrel type (F crimp type) crimp terminal, for the purpose of both suppressing the spring back of the conductor crimping piece and reducing the contact resistance between the conductor of the wire and the crimp terminal. A technique is disclosed in which a folded portion is provided in a conductor crimping piece of a terminal, and a through hole or a notch is provided in the folded portion. Here, in the technique described in Patent Document 5, since the crimp terminal is an open barrel type, it is possible to secure the mechanical strength of the crimp terminal by suppressing the spring back of the conductor crimping piece. .

JP 2011-222243 A JP 2004-207172 A JP 2010-062097 A JP 2009-123621 A JP 2009-123622 A

  However, in the techniques described in Patent Documents 3 and 4, since it is necessary to provide a folded portion, the places where the concave portions can be formed are limited, so that the contact resistance between the electric wire as a conductor and the crimp terminal is reduced. There is a problem that the effect cannot be obtained sufficiently.

  Moreover, according to the technique described in Patent Document 5, it is possible to suppress the spring back of the conductor crimping piece in the open barrel type crimp terminal. However, the technique described in Patent Document 5 cannot be applied to a crimp terminal that does not include a conductor crimping piece. This is because the problem of springback is a problem that occurs in a portion where internal stress is large even in a crimp terminal, such as a conductor crimping piece.

  Furthermore, in the technique described in Patent Document 5, although it is possible to suppress the springback, it is impossible to avoid the springback. As time passes, there is a space between the electric wire and the crimp terminal. There is also a concern that the significance of providing a through hole or notch may be lost.

  Moreover, since all the crimp terminals described in Patent Documents 3 to 5 are of an open barrel type, there is a problem that the conductor itself corrodes as described above.

  On the other hand, in the case of a crimping terminal provided with a crimping part (cylindrical crimping part) pre-formed on a cylindrical body having an insertion port for inserting an electric wire, the conductor is not exposed. However, unlike the case of the conductor crimping piece, there is not much bias in the distribution of internal stress, although a large deformation has occurred in the cylindrical crimping part pressed from the side during the production, The problem of springback does not occur so much.

  Therefore, in the crimp terminal provided with the cylindrical crimp part, it is required to secure the mechanical strength against the pressing force itself rather than the mechanical strength against the spring back (internal stress). That is, in a crimp terminal provided with a cylindrical crimp part, the cylindrical crimp part is not damaged by a pressing force during manufacturing, that is, a high yield is required.

  In view of the above points, the present invention is a crimp terminal having a cylindrical crimp part, which can sufficiently reduce the contact resistance between the conductor of the electric wire and the crimp terminal, and improve the yield. An object of the present invention is to provide a crimp terminal that can be used. Another object of the present invention is to provide a wire with such a terminal and a method for producing the wire with the terminal.

  In order to solve at least one of the above-described problems or to achieve the above-described object, the present invention takes the following aspects, for example.

  The electric wire terminal according to the first aspect of the present invention is a cylindrical crimp portion having an insertion port for inserting at least one electric wire as a conductor, and is composed of a plate-like base material made of a conductive material. In the electric wire terminal provided with the cylindrical crimping portion, the cylindrical crimping portion forms part of the plate-like base material constituting the cylindrical crimping portion or at least part of the surface in contact with the electric wire, or A thick part having a thickness larger than that of the other part of the cylindrical crimping part, which is a separate body from the plate material, and the thickened part when the electric wire is crimped to the electric wire terminal It is a terminal for electric wires characterized by including the convex part or recessed part which touches at least. In the present specification, the convex portion or concave portion formed in the thick portion is also referred to as “first serration”.

  Preferably, in the above aspect, the thick portion includes a convex portion, and a cross-sectional shape of the convex portion forms a triangle.

  More preferably, in the above aspect, the convex portion has different lengths on two sides sandwiching the apex angle.

  The terminal-attached electric wire according to the second aspect of the present invention is in contact with the electric wire terminal according to the first aspect described above and the convex portion or the concave portion of the thick portion of the cylindrical crimp portion of the electric wire terminal. It is an electric wire with a terminal characterized by including at least one electric wire.

  The method according to the second aspect of the present invention is for producing an electric wire with a terminal in which at least one electric wire as a conductor is fixed to an electric wire terminal composed of a plate-like substrate made of a conductive material. In the method, any one of claims 1 to 3 from a single plate-like base material, or from a single plate-like base material and a plate-like base material separate from the plate-like base material. A cylindrical crimping portion of the electric wire terminal according to claim, comprising at least a convex portion or a concave portion, and having a thick portion larger than the thickness of the single plate-like substrate. A step of forming, a step of inserting at least one electric wire through an insertion port of the cylindrical crimping portion, and a cylindrical crimping in which the electric wire is inserted in order to crimp the electric wire to the cylindrical crimping portion. By applying pressure to the part from the side, the wire is brought into contact with the convex part or concave part of the thick part of the cylindrical crimp part. Comprising a step of, the, characterized in that a method.

  According to the 1st aspect and 2nd aspect of this invention mentioned above, since the crimping | compression-bonding part is formed in the cylinder shape, the approach of water can be avoided and corrosion prevention performance can be improved, and a cylinder crimping | compression-bonding is also possible. Since the part has a thick part that can withstand strong compression, the mechanical strength against crimping (that is, the mechanical strength at the time of manufacture) can be sufficiently secured to improve the yield. Since the convex portion or the concave portion as the first serration is provided in the part, the insulating film such as an oxide film formed on the surface of the electric wire is formed by contacting the side surface of the electric wire with the first serration. The possibility of destruction can be increased, and thus the contact resistance between the conductor of the electric wire and the crimp terminal can be sufficiently reduced. Therefore, according to these aspects, it is possible to provide an excellent electric wire with terminal or electric wire terminal. In addition, according to the method of the second aspect of the present invention, an electric wire with a terminal can be easily manufactured.

FIG. 1 is a perspective view of an electric wire with terminals according to a first embodiment for carrying out the present invention. 2 is a sectional view taken along line II-II in FIG. 1 of the electric wire with terminal shown in FIG. FIG. 3 is a cross-sectional view showing a first example of the configuration of the cylindrical crimp portion of the electric wire terminal in FIGS. 1 and 2. FIG. 4 is a cross-sectional view showing a second example of the configuration of the cylindrical crimp portion shown in FIG. FIG. 5 is a cross-sectional view showing a third example of the configuration of the cylindrical crimping portion shown in FIG. FIG. 6 is an enlarged cross-sectional view illustrating a configuration of a folded piece according to a modified example of the folded piece of the cylindrical crimp portion illustrated in FIG. 3. FIG. 7 is an enlarged cross-sectional view of a convex portion according to a modification of the convex portion formed on the folded piece shown in FIG. 6, and FIG. FIG. 7B shows a case where the top of the convex portion is directed in a direction opposite to the direction shown in FIG. 7A. FIG. 8: is sectional drawing which shows the structure of the cylindrical crimping | compression-bonding part of the electric wire with a terminal which concerns on 2nd Embodiment for implementing this invention. FIG. 9 is a diagram reprinting FIG. 2 of Patent Document 5 (Japanese Patent Laid-Open No. 2009-123622).

  Hereinafter, an electric wire with a terminal concerning one form for carrying out the present invention is explained based on a drawing.

(First embodiment)
FIG. 1 is a perspective view of an electric wire with terminals according to a first embodiment for carrying out the present invention. 2 is a sectional view taken along line II-II in FIG. 1 of the electric wire with terminal shown in FIG.

  1 and 2, a terminal-attached electric wire 1 includes an electric wire portion 2 as a conductive wire, and an electric wire terminal 100 for connecting the electric wire portion 2 to other electrical equipment so as to be energized. Yes. And the electric wire part 2 is being fixed to the said electric wire terminal 100 in the state inserted in the hollow part inside the electric wire terminal 100, as shown in FIG. 2, Thereby, both are contacting each other. In addition, in order to fix the electric wire part 2 to the terminal 100 for electric wires, the terminal 100 for electric wires is partially crimped by the crimping (pressing force) from the side.

  The electric wire portion 2 includes an electric wire bundle 3 and an insulating coating material 4 that covers the electric wire bundle 3. For example, the wire bundle 3 has a wire diameter of 2.1 mm, the insulation coating material 4 has a thickness of 0.35 mm, and the wire portion 2 has an outer diameter of 2.8 mm. The electric wire bundle 3 is formed by winding a plurality of electric wires (element wires) that are conductors. Each of the electric wires constituting the electric wire bundle 3 is made of a conductive material. The example of the electroconductive material which comprises an electric wire is a metal. Here, when the electric wire is made of metal, the metal is, for example, copper, copper alloy, aluminum, or aluminum alloy. Here, it is preferable that the electric wire is made of aluminum or an aluminum alloy, whereby the weight of the electric wire with terminal 1 can be reduced. Note that one wire may be used instead of the wire bundle 3.

  As shown in FIGS. 1 and 2, the electric wire terminal 100 includes a connector portion 10, a transition portion 20, and a tubular crimp portion 30.

  The connector part 10 is a connector for connecting with other electrical equipment. In addition, although the connector part 10 is a female type (receptacle type) in the example shown in FIG.1 and FIG.2, a male type (plug type) may be sufficient. The transition part 20 is between the connector part 10 and the cylindrical crimp part 30, and is for connecting both.

  The tubular crimping portion 30 is a tubular body made of a conductive material so as to be connected to the conductor of the electric wire portion 2 so as to be energized, and having an insertion port for inserting the electric wire bundle 3 of the electric wire portion 2. In general, it is formed into a cylindrical body having a tapered shape whose diameter decreases toward the transition portion 20. Here, the welding region 35 shown in FIG. 1 basically forms both ends of one plate-like base material having a predetermined plate thickness (for example, 0.25 mm) in order to form the cylindrical crimp portion 30. This is a region where welding has been performed for joining, whereby the wire bundle 3 is not exposed, and corrosion prevention can be realized. In addition, the material used for welding may be the constituent material itself of the cylindrical crimping part 30, or another material (for example, wax).

  The cylindrical crimp part 30 will be described in more detail.

  FIG. 3 is a cross-sectional view showing a first example of the configuration of the tubular crimping portion 30 of the wire terminal 100 in FIGS. 1 and 2. Note that FIG. 3 also shows the wire bundle 3 inserted into the cylindrical crimp portion 30.

  As shown in FIG. 3, the tubular crimp portion 30 has two folded pieces 31 on the surface in contact with the side surface of the wire bundle 3. Specifically, as shown in FIG. 2, these folded pieces 31 are arranged on a surface that contacts the side surface of the wire bundle 3 and a surface that contacts the tip end surface of the wire bundle 3. These folded pieces 31 are a part of one plate-like base material constituting the cylindrical crimp part 30. Specifically, the one plate-like base material is disposed along a predetermined folding line. This corresponds to the area from the folding line to the edge in the folding direction when folded. Note that folding can be performed by press working. And the part which the plate-shaped base material overlapped by two sheets by folding | folding comprises the thick part of the cylindrical crimping | compression-bonding part 30. FIG. In other words, the folded piece 31 constitutes a part of the thick part of the cylindrical crimp part 30. And since the cylindrical crimping | compression-bonding part 30 has sufficient mechanical strength by having a thick part, it can reduce possibility that a damage will occur, even if it crimps.

  Each of the folded pieces 31 is formed with a plurality of recesses 32 as first serrations on the surface in contact with the wire bundle 3 as shown in FIG. These concave portions 32 are provided to deform the electric wire bundle 3 when the electric wire bundle 3 is crimped to the electric wire terminal 100, so that a step portion corresponding to the concave portion 32 (of the folded piece 31 is formed). The surface of the wire bundle 3 is scraped off by the frictional force or the like when the wire bundle 3 comes into contact with an uneven corner or wall surface on the surface in contact with the wire bundle 3, and insulation such as an oxide film formed on the surface is removed. The protective coating is destroyed. As a result, the electrical conductivity between the electric wire part 2 and the electric wire terminal 100 can be reliably ensured. In addition, since aluminum and an aluminum alloy are easy to form an oxide film compared with copper and a copper alloy, when the wire bundle 3 is made of aluminum or an aluminum alloy, the wire bundle 3 is crimped to the wire terminal 100. It is preferable to increase the pressing force to be applied (strong compression) to break the oxide film.

  Here, the shape of the recess 32 may be a groove shape or a hole shape, and the cross-sectional shape of such a groove or hole may be a rectangle as shown in FIG. Alternatively, it may be triangular or U-shaped (semi-circular). From the viewpoint of facilitating the formation of the recess 32, the shape of the recess 32 is preferably a groove having a rectangular cross section. The size and arrangement of the recesses 32 can be arbitrarily determined. Preferably, the dimension in the width direction of the opening of the recess 32 (or the direction perpendicular to the longitudinal direction of the groove if the recess 32 is a groove) is the element of each electric wire (wire) constituting the wire bundle 3. More preferably, it is within a range of 1/4 (1/4) to 1/10 (1/10) of the wire diameter of each electric wire so as to be smaller than the wire diameter (for example, 300 μm) (for example, The concave portion 32 is formed so as to be within a range of 30 μm to 75 μm, and thereby the area of the opening of the concave portion 32 is made smaller than the area of the cut surface of the electric wire, and the side surface of the wire bundle 3 is folded back 31. This increases the possibility of coming into contact with the step (recess 32 or protrusion) provided on the surface. The same applies to the interval (dimension) between two adjacent recesses 32.

  According to the cylindrical crimping portion 30 according to the first example shown in FIG. 3, the thick portion is formed by the folded piece 31, and the concave portion 32 as the first serration is further provided in the thick portion. Therefore, the mechanical strength of the wire terminal 100 can be sufficiently increased, and the conductivity between the wire portion 2 and the wire terminal 100 can be reliably ensured by the first serration. Here, according to the present embodiment, since the first serration is provided in the thick portion, the region in which the first serration is provided is not narrowed.

  FIG. 4 is a cross-sectional view showing a second example of the configuration of the tubular crimping portion 30 shown in FIG.

  The cylindrical crimping part 30 according to the second example shown in FIG. 4 has two folded pieces 31 like the cylindrical crimping part according to the first example shown in FIG. 3, and these folded pieces. The position of the folding line when forming 31 is the same. However, in the second example, the width of the surface of the folded piece 31 is different from that of the first example. Specifically, the entire inner peripheral surface of the tubular crimping portion 30 is the inner peripheral surface of the thick portion. The folded piece 31 is provided so that it may be comprised by these. As a result, a large number of first serrations can be provided over the entire surface in contact with the wire bundle 3, and the mechanical strength of the tubular crimping portion 30 is reduced even when such a large number of first serrations are provided. Not only can this be prevented, but rather, mechanical strength can be improved even when compared with a cylindrical crimping part in which no thick part is provided.

  In addition, as shown in FIG. 4, the two folded portions are formed at a place where the end portion 311 of one folded piece 31 and the end portion 311 of the other folded piece 31 are in contact with each other on the inner peripheral surface of the cylindrical crimp portion 30. Further folding may be performed on at least one of the pieces 31. Thereby, the possibility of contacting the wire bundle 3 at the end 311 of the folded piece 31 can be increased. Furthermore, another serration (concave portion or convex portion) may be provided along the outer edge of the end portion 311 of the folded piece 31, or the end portion 311 may be sharply processed. An insulating film such as an oxide film formed on the surface of the film can be easily broken.

  FIG. 5 is a cross-sectional view showing a third example of the configuration of the tubular crimping portion 30 shown in FIG.

  The cylindrical crimp part 30 according to the third example shown in FIG. 5 differs from the cylindrical crimp part according to the first example shown in FIG. 3 only in the position of the folding line when the folded piece 31 is formed. As in the first example, two folded pieces 31 are provided. Specifically, in the third example, the folding line is along a direction intersecting with the longitudinal direction of the welding region 35 (for example, a direction perpendicular to the longitudinal direction of the welding region 35) (not shown). . On the other hand, in the first example and the second example, the folding line is along the welding region 35.

  However, in the case of the first example and the third example as well, the cylindrical crimp part 30 is formed from a single plate-like base material, and therefore, at the position of the folding line set on the plate-like base material. Accordingly, the width of the folded piece 31 is limited. Therefore, whether the first example or the second example should be adopted or the third example shown in FIG. 5 should be adopted depending on the width of the folded piece 31 to be formed, the ease of processing, and the like. It is preferable to determine.

  Here, not only the cylindrical crimp part 30 but also a region for forming the connector part 10 and the transition part 20 is included in one plate-like base material prepared for manufacturing the electric wire terminal 100. They are arranged in the longitudinal direction (insertion direction of the electric wire portion 2), and the outer shape is adjusted by punching. Therefore, when the plate-like base material has a space for forming the folded piece 31 as in the third example, it is used in the punching process in the plate-like base material by adopting the third example described above. Unused parts, that is, waste of materials can be eliminated.

  FIG. 6 is an enlarged cross-sectional view illustrating a configuration of a folded piece according to a modified example of the folded piece 31 of the cylindrical crimp portion 30 illustrated in FIG. 3.

  The folded piece 31a of the cylindrical crimping part 30 shown in FIG. 6 is a modification of the folded piece 31 of the cylindrical crimped part according to the first example shown in FIG. 3, and the first example is used as the first serration. A plurality of convex portions 33 are formed instead of the concave portions 32 in FIG. Here, although it is difficult to provide the convex part 33 on the surface of the plate-shaped base material which comprises the cylindrical crimping | compression-bonding part 30, by providing the convex part 33, it is a thick part rather than the case where the recessed part 32 is provided. The protrusion 33 is not only preferable in that the thickness of the wire bundle 3 can be further increased, but the protrusion 33 can be further deformed in the wire bundle 3 at the time of crimping compared to the recess 32 or the wire bundle 3. It is also preferable in that it is possible to increase the possibility of breaking an insulating film such as an oxide film formed on the surface. In addition, the wire bundle 3 can be made difficult to be pulled out from the wire terminal 100 by further deformation of the wire bundle 3.

  In addition, the shape of the convex part 33 may be a bowl shape, may be a columnar shape or a cone shape, and the cross-sectional shape of such a collar, column or cone is a triangle as shown in FIG. Alternatively, it may be rectangular or U-shaped (semi-circular) instead. Moreover, although the size and arrangement | positioning of the convex part 33 can be determined arbitrarily, it is preferable to determine in consideration of the high possibility of the side surface and the front end surface (cut surface) of the wire bundle 3 coming into contact. For example, when the cross-sectional shape of the convex portion 33 is a triangle, the shortest distance (height) from the bottom surface to the top is 0.5 mm, and the interval between two adjacent tops is 1 mm.

  However, since aluminum or an aluminum alloy easily forms an insulating film such as an oxide film, when the electric wire is made of aluminum or an aluminum alloy, the shape of the projection 33 is destroyed and the insulating film such as an oxide film is destroyed. It is preferable to have a shape that is easy to form, and specifically, it is preferable that the cross-sectional shape be a triangular shape, a columnar shape, or a conical shape. Moreover, the possibility that the convex part 33 destroys insulating films, such as an oxide film currently formed in the side surface of the electric wire bundle 3, can be improved by making the shape of the convex part 33 into a column shape or a cone shape. On the other hand, by making the shape of the convex portion 33 into a bowl shape, the convex portion 33 is surely brought into contact with the side surface of the wire bundle 3, so that the wire bundle 3 can be hardly pulled out from the wire terminal 100. .

  More preferably, the cross-sectional shape of the convex portion 33 is triangular, and the top portion thereof is further opposed to the insertion direction of the wire bundle 3 into the tubular crimp portion 30 by pressing or the like (direction toward the insertion port). ) (See FIG. 7A) or in the forward direction of the insertion direction (see FIG. 7B) (that is, the apex angle of the triangle forming the cross-sectional shape of the convex portion) By making the two sides sandwiched have different lengths), the wire bundle 3 is further prevented from being pulled out from the wire terminal 100. In addition, it is preferable to determine the direction of the top part of the convex part 33 according to the thickness and hardness of insulating films, such as an oxide film currently formed in the conductor wire diameter and hardness, or the conductor surface.

  In addition, as a method of forming the convex portion 33 on the folded piece 31a, a method of performing press working from the back surface of the plate-like base material that is a material of the cylindrical crimp portion 30, or mechanical excavation from the surface of the plate-like base material. There are a method of digging up a part of the plate-like base material, a method of joining a member corresponding to the convex portion 33 on the surface of the plate-like base material, and the like. In this modified example, since the thick part is provided in the cylindrical crimp part 30, even if it employ | adopts any of the method of forming the above-mentioned convex part 33, in the cylindrical crimp part 30, the folding piece 31a The mechanical strength is not impaired even when compared with a cylindrical crimping portion that does not have a metal plate.

  In summary, according to the electric wire 1 with a terminal according to the first embodiment described above, the cylindrical crimp portion 30 is provided with a thick portion, and the thick portion is further provided with a first serration (recess 32). Or the convex part 33) is provided. Therefore, according to this embodiment, even if a thick wall portion is provided in the cylindrical crimping portion 30, it is possible to eliminate the sacrifice of the space for providing the first serration. As a result, the wire bundle 2 and the electric wire The contact resistance with the attached terminal 100 can be sufficiently reduced, and the cylindrical crimp part 30 is provided with a thick part, so that sufficient mechanical strength at the time of manufacture can be ensured. Yield can be improved. Moreover, since the cylindrical crimping | compression-bonding part 30 of the electric wire 1 with a terminal is shape | molded by the cylinder which has the insertion port for inserting the wire bundle 3, anticorrosion performance is high compared with an open barrel type crimp terminal.

  In addition, in 1st Embodiment mentioned above, although the cylindrical crimping | compression-bonding part 30 provided the folding piece 31 or the folding piece 31a, and provided the thick part in the terminal 100 for electric wires, it comprises a thick part. The method for this is not limited to folding, and a base material different from the plate-like base material constituting the cylindrical crimping portion 30 is prepared, and the outer shape of the folded piece 31 or the outer shape of the folded piece 31a described above. You may process into the same external shape and arrange | position to the internal peripheral surface of a cylindrical crimping | compression-bonding part. Thereby, the first serration can be processed more easily.

(Second Embodiment)
Subsequently, a second embodiment for carrying out the present invention will be described. The electric wire with a terminal according to the second embodiment is different from the configuration of the cylindrical crimp portion 30 of the electric wire terminal 100 according to the first embodiment in the configuration of the cylindrical crimp portion of the electric wire terminal. Therefore, the same components are denoted by the same or similar reference numerals, and descriptions of other configurations are omitted.

  FIG. 8: is sectional drawing which shows the structure of the cylindrical crimping | compression-bonding part of the electric wire with a terminal which concerns on 2nd Embodiment for implementing this invention.

  The electric wire terminal 100 ′ of the electric wire 1 ′ with a terminal according to the present embodiment includes a cylindrical crimp part 30 ′ as shown in FIG. 8.

  A plurality of convex portions 37 are formed as second serrations on the inner peripheral surface of the tubular crimp portion 30 ′ and in contact with the side surface of the wire bundle 3 ′ of the wire portion 2 ′. Specifically, the convex portion 37 is formed on the inner peripheral surface of the cylindrical crimp portion 30 ′ at a location where the folded pieces 31 and 31 a described in the first embodiment are not provided.

  In addition, since the function and manufacturing method of the convex part 37 are respectively substantially equivalent to the function and manufacturing method of the convex part 33 provided in the folding piece 31a of the cylindrical crimp part 30 demonstrated using FIG. Although most of the description is omitted, preferably, the cross-sectional shape of the convex portion 37 is a triangle, more preferably, the cross-sectional shape of the convex portion 33 is a triangle as shown in FIG. By placing the top portion in a direction (direction toward the insertion port) opposite to the insertion direction of the wire bundle 3 into the cylindrical crimp portion 30 by pressing or the like, or in the forward direction of the insertion direction, Further, the electric wire bundle 3 is hardly pulled out from the electric wire terminal 100.

  According to the second embodiment, not only the first serration is provided, but also the second serration (convex portion 37) is provided on the side surface of the wire bundle 3 ′, so that the cylindrical crimping is performed. Further deformation can be brought about at least in the wire bundle 3 ′ by pressing when the wire bundle 3 ′ is crimped to the portion 30 ′. Further, the wire bundle 3 ′ can be made difficult to be pulled out from the wire terminal 100 ′ by further deformation of the wire bundle 3 ′. Furthermore, an insulating film such as an oxide film formed on the side surface of the wire bundle 3 ′ is destroyed by the pressure and friction force when the second serration contacts the side surface of the wire bundle 3 ′, and the wire bundle Conductivity between 3 'and the terminal 100' for electric wires can be ensured.

  In the second embodiment described above, the plurality of convex portions 37 are formed. However, the number of the convex portions 37 may be one. In the second embodiment, as the second serration, a concave portion may be formed instead of the convex portion 37, or both the convex portion and the concave portion may be formed.

  Further, in the second embodiment described above, the first serration may not be provided. In this case, the effect that the wire bundle 3 ′ can be hardly pulled out from the wire terminal 100 ′ and the conductivity between the wire bundle 3 ′ and the wire terminal 100 ′ can be ensured. Will be played.

(Production method)
Then, an example of the manufacturing method of the terminal 1 with an electric wire which concerns on 1st Embodiment mentioned above is demonstrated. In addition, since the manufacturing method of terminal 1 'with an electric wire which concerns on 2nd Embodiment mentioned above is the same except formation of 2nd serration (convex part 37), the description is abbreviate | omitted.

  First, in order to form the electric wire terminal 100, one sheet-like base material is prepared. This plate-like base material is made of a conductive material, basically has a predetermined plate thickness, and its outer shape is when the cylindrical crimping portion 30 of the electric wire terminal 100 is developed. The external shape including at least the external shape. That is, in this plate-shaped substrate, press molding for forming the connector portion 10 of the electric wire terminal 100 may already be performed. And the recessed part 32 (or convex part 33) as a 1st serration is already formed in this plate-shaped base material. The method for forming such a recess 32 may be machining (for example, excavation processing) or chemical processing (for example, drug processing, laser processing).

  Next, the prepared plate-like base material is processed, and the connector portion 10 as shown in FIG. 1, the transition portion 20, and the cylindrical precursor as the precursor of the cylindrical crimping portion 30 are subjected to press working. Mold. Here, in the press working of the cylindrical precursor, press working for forming the folded piece 31 or the folded piece 31a is also performed. In addition, this shaping | molding method is not restricted to press work.

  Subsequently, in the cylindrical precursor, welding is performed on both end portions that are close to each other or overlapped by pressing, thereby forming a weld region 35 in the cylindrical precursor. Thereby, the insertion port for inserting the electric wire part 3 is completed. In addition, when manufacturing the member corresponding to the folding piece 31 or the folding piece 31a (a part of thick part) by processing another plate-shaped base material, the said member is arrange | positioned inside a cylindrical precursor. Or arranged on the side surface of the wire bundle 3.

  And the electric wire bundle 3 of the electric wire 2 is inserted through an insertion port in the hollow part inside the cylindrical precursor which was welded, and the electric wire bundle 3 is positioned. The positioning of the wire bundle 3 is determined according to the malleability of the conductors that make up the wire bundle 3.

  Subsequently, with the electric wire bundle 3 positioned, pressure is applied to the tubular crimping portion 30 from the side with respect to the tubular precursor. Note that this pressing is not limited to one time, and may be performed a plurality of times. By this pressing, the wire bundle 3 comes into contact with the cylindrical precursor and is crimped. Thereby, the electric wire 1 with a terminal is completed.

  In the manufacturing method as described above, the first serration and the second serration can be formed at an arbitrary timing before the wire bundle 3 is inserted into the hollow portion inside the cylindrical crimp portion 30. However, considering the ease of processing, it is preferable to form the material before pressing.

  According to the manufacturing method of the electric wires 1 and 1 ′ with terminals as described above, the electric wires 1 with terminals according to the first embodiment and the electric wires 1 with terminals excellent in conductivity are easily manufactured. Moreover, since the thick part is provided in the cylindrical crimp part 30, the mechanical strength at the time of manufacture is fully ensured, and the fall of a yield can be suppressed. In the above-described manufacturing method, punching may be performed to form a plurality of electric wire terminals from one plate-like base material, which can further increase mass productivity.

(Other embodiments)
In the first and second embodiments described above, the welded region 35 is provided in the tubular crimp portion 30. However, a joining method for joining both edge portions of the plate-like base material is as follows. The welding method is not limited to the melting of the base material itself, and the joining method may be laser welding (brazing process) or mold process using a resin. In addition, it is possible to prevent water or the like from entering the inside of the cylindrical crimp part 30. However, welding is preferable from the viewpoint of solving the problem of springback.

  In addition, in order to achieve the object of the present invention or to solve the problems set in the present invention, a wire terminal and a plate-like base prepared for forming at least one of the wire terminals are provided. It goes without saying that materials and the like are also objects of the present invention.

  Examples of the present invention will be described below.

In the Example of this invention, it is the electric wire with a terminal manufactured by the manufacturing method mentioned above, and the electric wire with a terminal by which the recessed part as a 1st serration is provided in the return piece (Examples 1-4), and For the electric wires with terminals (comparative examples 1 to 4) which are different from the electric wires with terminals according to Examples 1 to 4 although they are electric wires with terminals manufactured by the same manufacturing method, From the viewpoint of mechanical strength, it was evaluated from the viewpoint of conductivity between the electric wire and the terminal for electric wire and from the viewpoint of anticorrosion performance.
In addition, as a conductor (electric wire bundle) of the electric wire part used in the case of manufacture, the aluminum electric wire conductor, specifically "MSAl" by Furukawa Electric Co., Ltd. was used. The conductor composition of this aluminum wire conductor “MSAl” was composition: Fe about 0.2%, Cu about 0.2%, Mg about 0.1%, Si about 0.04%, the balance Al and inevitable impurities. . Moreover, as the plate-like base material (strip material) for the terminal for electric wires used in the production, a strip material obtained by performing reflow tin plating on a copper alloy was used. Specifically, “FAS-680” (plate thickness: 0.25 mm, H material) manufactured by Furukawa Electric Co., Ltd. was used as the copper alloy.

(Evaluation method)
First, the evaluation method of the electric wire with a terminal concerning each example (Examples 1-4 and comparative examples 1-4) is explained. Details (configuration and evaluation results) of each example will be described later.

  Regarding the mechanical strength of the cylindrical crimping part, the pressing part of the wire terminal was observed with a microscope. As a result, if no crack was observed, the wire terminal was damaged, that is, the mechanical strength was sufficient. On the other hand, when a crack was observed, it was evaluated that the wire terminal was damaged, that is, the mechanical strength was not sufficient. Here, it can be said that the terminal for electric wires evaluated with low mechanical strength is a thing with a low yield in the case of the manufacture.

  For the electrical conductivity between the electric wire and the electric wire terminal, first, the initial electric resistance value, the electric resistance value after performing the temperature cycle test, and the terminal according to each example after performing the temperature cycle test The electrical resistance value after conducting a corrosion test on the electric wire was measured. Here, in the temperature cycle test, the terminal-attached electric wires according to the respective examples were held for 1 hour in an environment of −40 ° C., and then held for 1 hour at 120 ° C. for 1000 cycles. In this temperature cycle test, an air tank tester was used. In the corrosion test, the electric wire with terminal according to each example after the temperature cycle test was subjected to salt spray for 200 hours (so-called salt spray test; specifically, neutral salt spray test of JIS Z 2371). .

  Subsequently, the electrical resistance value obtained by the measurement was evaluated as follows. When the initial electrical resistance value is less than 1 mΩ, it is evaluated that the conductivity is excellent. On the other hand, when it is 1 mΩ or more, it cannot be said that the conductivity is excellent. evaluated.

  In addition, regarding the electrical resistance value after the temperature cycle test and the electrical resistance value after the corrosion test are performed, if the increase relative to the initial electrical resistance value is less than 1 mΩ, as a wire with a terminal On the other hand, when it was 1 mΩ or more, it was evaluated that the electric wire with a terminal was not excellent in weather resistance. Here, the case where the amount of increase relative to the initial electrical resistance value is 1 mΩ or more means that a substantial decrease in conductivity was observed.

  For anti-corrosion performance, disassemble the crimped part of the terminal-attached electric wire obtained after the corrosion test, observe the exposed conductor (wire bundle), and if corrosion is not observed, the anti-corrosion performance is high On the other hand, when corrosion was recognized, it was evaluated that the anticorrosion performance was low.

  Below, the detail of each Example (Examples 1-4 and Comparative Examples 1-4) is demonstrated.

Example 1
As the electric wire with a terminal according to Example 1, an electric wire with a terminal including a cylindrical crimp portion having a cross-sectional shape shown in FIG. 3 was manufactured according to the manufacturing method described above. The cross-sectional area of the wire bundle was reduced by 50% (compression ratio: 50%) due to crimping during production.

  In the obtained electric wire with a terminal according to Example 1, no crack was observed. In addition, the initial electrical resistance value obtained by the measurement is 0.1 mΩ, and the electrical resistance value after the temperature cycle test is 0.3 mΩ (an increase with respect to the initial electrical resistance value: 0.2 mΩ). The electrical resistance value after performing the corrosion test was 0.7 mΩ (an increase with respect to the initial electrical resistance value: 0.6 mΩ). Furthermore, no corrosion was observed in the wire bundle after the corrosion test.

  From the above, the electric wire with terminal according to Example 1 according to Example 1 has sufficiently high mechanical strength, excellent electrical conductivity, excellent weather resistance, and high anticorrosion performance, As a result, it was evaluated that it was excellent as an electric wire with a terminal.

(Example 2)
As the electric wire with a terminal according to Example 2, an electric wire with a terminal provided with a tubular crimp portion having a cross-sectional shape shown in FIG. 3 was manufactured according to the manufacturing method described above. However, in the electric wire with a terminal according to the second embodiment, the width of the folded piece 31 is narrower than that in the first embodiment, and specifically, the folded piece 31 is the transition portion 20 as shown in FIG. It does not extend until. The compression rate by pressure bonding was 50%.

  In the obtained electric wire with a terminal according to Example 2, no crack was observed. In addition, the initial electrical resistance value is 0.1 mΩ, and the electrical resistance value after the temperature cycle test is 0.4 mΩ (increased from the initial electrical resistance value: 0.3 mΩ), which is a corrosion test. The electrical resistance value after performing the process was 0.7 mΩ (the increase with respect to the initial electrical resistance value: 0.6 mΩ). Furthermore, no corrosion was observed in the wire bundle after the corrosion test.

  From the above, the electric wire with a terminal according to Example 1 has a sufficiently high mechanical strength, an excellent electrical conductivity, an excellent weather resistance, and a high anticorrosion performance. It was evaluated as an excellent electric wire.

(Example 3)
As the electric wire with a terminal according to Example 3, an electric wire with a terminal provided with a tubular crimp portion having a cross-sectional shape shown in FIG. 4 was manufactured according to the manufacturing method described above. The compression rate by pressure bonding was 50%.

  In the obtained electric wire with a terminal according to Example 4, no crack was observed. The initial electrical resistance value is 0.1 mΩ, and the electrical resistance value after the temperature cycle test is 0.2 mΩ (increased from the initial electrical resistance value: 0.1 mΩ), which is a corrosion test. The electrical resistance value after performing the above was 0.5 mΩ (the increase with respect to the initial electrical resistance value: 0.4 mΩ). Furthermore, no corrosion was observed in the wire bundle after the corrosion test.

  From the above, the electric wire with terminals according to Example 3 has sufficiently high mechanical strength, excellent electrical conductivity, excellent weather resistance, and high anticorrosion performance. It was evaluated as an excellent electric wire.

Example 4
As an electric wire with a terminal according to Example 4, an electric wire with a terminal provided with a cylindrical crimp part having a cross-sectional shape shown in FIG. 5 was manufactured according to the manufacturing method described above. The compression rate by pressure bonding was 50%.

  In the obtained electric wire with a terminal according to Example 4, no crack was observed. The initial electrical resistance value is 0.2 mΩ, and the electrical resistance value after the temperature cycle test is 0.5 mΩ (increased from the initial electrical resistance value: 0.3 mΩ). The electrical resistance value after performing the above was 1.1 mΩ (the increase with respect to the initial electrical resistance value: 0.9 mΩ). Furthermore, no corrosion was observed in the wire bundle after the corrosion test.

  From the above, the electric wire with a terminal according to Example 4 has sufficiently high mechanical strength, excellent electrical conductivity, excellent weather resistance, and high anticorrosion performance. It was evaluated as an excellent electric wire.

(Comparative Example 1)
As an electric wire with a terminal according to Comparative Example 1, an electric wire with a terminal similar to Example 1 was manufactured. However, in the electric wire with a terminal according to Comparative Example 1, unlike the electric wire with a terminal according to Example 1, the folded piece 31 is not provided, and the concave portion as the first serration is a cylindrical crimp. It is formed on the inner peripheral surface of the part. The compression rate by pressure bonding was 50%.

  In the obtained electric wire with a terminal according to Comparative Example 1, the cylindrical crimp portion was damaged. Therefore, it was evaluated that the anticorrosion performance was low without observing with a microscope. No other evaluation was performed.

(Comparative Example 2)
The electric wire with a terminal according to Comparative Example 2 was manufactured in the same manner as the electric wire with a terminal according to Comparative Example 1. However, the compression rate by pressure bonding was changed to 75% (weak pressure bonding). The compression rate of 75% means that the cross-sectional area of the wire bundle has been reduced by 25% due to the crimping.

  In the obtained electric wire with a terminal according to Comparative Example 2, no crack was observed. The initial electrical resistance value is 1.5 mΩ, and the electrical resistance value after the temperature cycle test is 8.0 mΩ (increase relative to the initial electrical resistance value: 6.5 mΩ). The electrical resistance value after the test was 25 mΩ (increased with respect to the initial electrical resistance value: 23.5 mΩ). Further, corrosion was observed in the wire bundle after the corrosion test.

  From the above, although the electric wire with a terminal according to Comparative Example 2 has sufficient mechanical strength at the time of manufacture, it cannot be said that the electrical conductivity is excellent, nor is it excellent in weather resistance. And anticorrosion performance was also low, and as a result, it was evaluated that it was not excellent as an electric wire with a terminal.

(Comparative Example 3)
The electric wire with a terminal according to Comparative Example 3 was manufactured in the same manner as the electric wire with a terminal according to Comparative Example 1. However, in the electric wire with a terminal according to the comparative example 3, a plate-like substrate which is a plate-like base material having the same outer shape as the folded piece 31 in the first embodiment and is not provided with serrations inside the cylindrical crimp portion. The material was placed in the same location as where the folded piece 31 of Example 1 was placed. The compression rate by pressure bonding was 50%.

  In the obtained electric wire with a terminal according to Comparative Example 3, no crack was observed. The initial electrical resistance value was 0.1 mΩ, and the electrical resistance value after the temperature cycle test was 10.0 mΩ (increased from the initial electrical resistance value: 9.9 mΩ). The corrosion test was not performed.

  From the above, the electric wire with terminals according to Comparative Example 3 is evaluated as having sufficient mechanical strength and excellent electrical conductivity, but is not excellent in weather resistance. It was evaluated that it was not excellent as an electric wire.

(Comparative Example 4)
As an electric wire with a terminal according to Comparative Example 4, FIG. 2 of Patent Document 5 (Japanese Patent Laid-Open No. 2009-123622) (this FIG. 2 is reprinted as FIG. 9. However, the reference numerals in FIG. The electric wire with an open barrel type terminal shown in FIG. The compression rate by pressure bonding was 50%.

  In the obtained electric wire with a terminal according to Comparative Example 4, no crack was observed. The initial electrical resistance value was 0.3 mΩ. The electrical resistance value after performing the corrosion test on the electric wire with terminal after the temperature cycle test showed infinite. Moreover, with the passage of time, a springback occurred in the crimping portion of the electric wire with the terminal.

  From the above, although the electric wire with terminals according to Comparative Example 4 is evaluated as having sufficient mechanical strength and excellent electrical conductivity, the anticorrosion performance is low. It was evaluated as not good.

  From the comparison of the above-described Examples (Examples 1 to 4 and Comparative Examples 1 to 4), an electric wire with excellent terminals, specifically, mechanical strength (that is, yield), electrical conductivity, weather resistance and In order to manufacture an electric wire with a terminal excellent in anticorrosion performance, the crimping part is formed into a cylindrical shape (cylindrical crimping part 30), and a folded piece 31 is provided on the cylindrical crimping part 30, and It can be seen that the recessed portion 32 as the first serration may be provided in the folded piece 31.

  Moreover, it turns out from the comparison with Examples 1-3 and Example 4 that the one where the width | variety of the folding piece 31 is larger is a more excellent electric wire with a terminal.

  Furthermore, from the comparison between Example 1 and Comparative Example 3, even if a plate-like base material instead of the folded piece 31 and provided with no recess is prepared separately, it is sufficient at the time of manufacturing a terminal with an electric wire. It can be seen that a sufficient mechanical strength can be secured. Moreover, from the comparison between Example 1 and Comparative Example 3, by providing a recess in the plate-like substrate prepared as the folded piece 31 or a separate body in place thereof, the conductivity of the terminal with electric wire is more excellent. You can see that you can.

  In the example described above, an aluminum alloy was used as the conductor of the electric wire part. However, similar evaluation results were obtained even when aluminum was used instead. Similarly, the same tendency can be obtained even when copper alloys ("FAS-680" and "FAS-820" manufactured by Furukawa Electric Co., Ltd .; both of which conductivity is about 40% IACS) are used as the conductor of the electric wire part. Although the evaluation result which shows was obtained, the improvement of electroconductivity was not recognized as the case where an aluminum alloy was used or aluminum was used. This is considered to be because aluminum or aluminum alloy was easier to form an insulating film such as an oxide film, and according to the present invention, the insulating film such as an oxide film could be destroyed by serration.

  The terminal with electric wires according to the present invention is not only excellent in electrical conductivity and mechanical strength, but also easy to manufacture, so a technical field where a large number of terminals with homogeneous electric wires are required, for example, It can be said that there is a possibility of use in the technical field related to automobile manufacturing. In particular, in the technical field related to automobile manufacturing, in recent years, there has been a demand for weight reduction of electrical components. It is possible to meet the request.

1, 1 'Electric wire with terminal 2, 2' Electric wire part 3, 3 'Electric wire bundle 4 Insulation coating material 10 Connector part 20 Transition part 30, 30' Cylindrical crimp part 31, 31a, 31 'Folding piece 311 End part 32 Concave (first serration)
33 Convex (first serration)
35 Welding area 37 Convex part (second serration)
100,100 'Electric wire terminal

Claims (5)

In the terminal for electric wires provided with a cylindrical crimping part which is a cylindrical crimping part having an insertion port for inserting at least one electric wire as a conductor and made of a plate-like base material made of a conductive material,
The cylindrical crimping part forms part of the plate-like base material constituting the cylindrical crimping part or separate from the plate material, at least at a part of the surface in contact with the electric wire. Has a thicker portion that is thicker than other portions of the portion,
The thick portion includes at least a convex portion or a concave portion that comes into contact with the electric wire when the electric wire is crimped to the electric wire terminal.
A terminal for electric wires, characterized by that.   The electric wire terminal according to claim 1, wherein the thick portion includes a convex portion, and a cross-sectional shape of the convex portion forms a triangle.   The said convex part is a terminal for electric wires of Claim 2 which has the length from which 2 sides which pinch | interpose an apex angle differ.   The electric wire terminal according to any one of claims 1 to 3, and at least one electric wire in contact with the convex portion or the concave portion of the thick portion of the cylindrical crimp portion of the electric wire terminal. An electric wire with a terminal. In a method for producing an electric wire with a terminal, wherein at least one electric wire as a conductor is fixed to an electric wire terminal composed of a plate-like substrate made of a conductive material.
From a single plate-shaped base material, or from a single plate-shaped base material and a plate-shaped base material separate from the plate-shaped base material, according to any one of claims 1 to 3. A step of forming a tubular crimping portion having a thick portion larger than the plate thickness of the single plate-shaped substrate, which is a tubular crimping portion of the terminal for electric wires and includes at least a convex portion or a concave portion; ,
Inserting at least one electric wire through the insertion port of the tubular crimping portion;
In order to crimp the electric wire to the cylindrical crimping portion, by applying pressure from the side to the cylindrical crimping portion into which the electric wire is inserted, the convex portion of the thick portion of the cylindrical crimping portion. Or a step of contacting the recess;
including,
A method characterized by that.

Images