Electric wire with terminal and method for joining the same

Abstract

To provide an electric wire with a terminal in which bonding strength between the terminal and a core wire of the electric wire is improved by increasing an area where the core wire of the electric wire is in contact with the terminal, and to provide a bonding method thereof.SOLUTION: The wire with terminal 10 includes the wire 11 including the core 21 and the insulator covering portion 22 for covering the core 21 with a part of the core 21 exposed, and the terminal 12 including the wire connecting portion 32 to which the core 21 of the wire 11 is joined. A recessed serration 40 extending along the width direction of the terminal 12 is formed on the conductor bonding surface 35 of the wire connection portion 32, and the core wire 21 and the terminal 12 are bonded by ultrasonic bonding in a state where the core wire 21 is in contact with the serration 40. In the core wire 21, the joining mark 90 with which the convex portion 80 of the horn 61 of the ultrasonic joining machine has been in contact is formed on the side opposite to the side joined to the terminal 12, and the center of the serration 40 and the center of the joining mark 90 are arranged so as to be aligned on a straight line parallel to the height direction of the core wire 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric wire with a terminal and a method for joining the same. [Background technology]

[0002] When manufacturing an electric wire with terminal in which a terminal is connected to a core wire exposed from the end of the electric wire, the core wire and the terminal are joined together by ultrasonic bonding by pressing the core wire against the terminal and applying ultrasonic vibrations (see Patent Document 1). In such an electric wire with terminal, the core wire exposed from the end of the electric wire and a part of the terminal are generally clamped between an anvil and a horn, and the horn is ultrasonically vibrated to join the core wire to the terminal (ultrasonic bonding). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-149552 Summary of the Invention [Problem to be solved by the invention]

[0004] In ultrasonic bonding, the bonding strength between the terminal and the electric wire core depends on the size of the contact area between the electric wire core and the terminal. In the case of Patent Document 1, if the contact area between the electric wire core and the terminal is not sufficiently secured, a problem may arise in that the bonding strength cannot be increased.

[0005] The present invention has been made in view of the problems inherent in the prior art, and an object of the present invention is to provide an electric wire with a terminal, and a joining method therefor, in which the contact area between the electric wire core and the terminal is increased to improve the joining strength between the terminal and the electric wire core. [Means for solving the problem]

[0006] An electric wire with a terminal according to one embodiment of the present invention comprises an electric wire having a core wire and an insulating coating portion that covers the core wire while leaving a portion of the core wire exposed, and a terminal having an electric wire connection portion to which the core wire of the electric wire is joined, wherein a concave serration extending along the width direction of the terminal is formed on the conductor joining surface of the electric wire connection portion, and the core wire and the terminal are joined by ultrasonic joining with the core wire in contact with the serration, and a joining mark where the convex portion of the horn of the ultrasonic joining machine made contact is formed on the side of the core wire opposite the side joined to the terminal, and the center of the serration and the center of the joining mark are arranged so as to be aligned on a straight line parallel to the height direction of the core wire.

[0007] A method for joining an electric wire with a terminal according to an embodiment of the present invention includes clamping an electric wire having a core wire and an insulating coating portion that covers the core wire while leaving a portion of the core wire exposed, and a terminal having an electric wire connection portion to which the core wire of the electric wire is joined, between a horn and an anvil of an ultrasonic joining machine, and joining them by ultrasonic joining, wherein concave serrations extending along the width direction of the terminal are formed on the conductor joining surface of the electric wire connection portion, and convex portions extending along the width direction of the terminal are formed on the horn. The joining method includes the steps of: placing the terminal on top of the anvil, and then placing the core wire on top of the wire connection portion of the terminal, arranging the terminal so that the centers of the serrations and the convex portions are aligned on a straight line parallel to the height direction of the core wire; and bringing the horn into contact with the core wire, and, with the core wire in contact with the serrations and the convex portions, applying pressure and vibrating the horn in a vertically downward direction, thereby joining the core wire and the terminal by ultrasonic joining. After ultrasonic bonding, a bonding mark 90 where the convex portion 80 of the horn 61 was in contact is formed on the side of the core wire 21 opposite to the side bonded to the terminal 12, and the center of the serration 40 and the center of the bonding mark 90 are arranged so as to be aligned on a straight line parallel to the height direction of the core wire 21. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an electric wire with a terminal in which the contact area between the electric wire core and the terminal is increased to improve the joint strength between the terminal and the electric wire core, and a joining method therefor. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an example of an electric wire with a terminal according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a perspective view showing a state before the terminal and the electric wire are joined together. [Figure 3] FIG. 2 is a side view showing a state in which the terminal and the electric wire are placed in the ultrasonic bonding machine. [Figure 4] FIG. 10 is a side view showing a state in which a terminal and an electric wire are joined by an ultrasonic joining machine. [Figure 5] FIG. 5 is an enlarged view of FIG. [Figure 6] 4 is an enlarged cross-sectional view schematically showing serrations formed on a conductor joining surface of an electric wire connecting portion. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a terminal-attached electric wire and a joining method thereof according to the present embodiment will be described in detail with reference to the drawings. Note that the dimensional proportions in the drawings are exaggerated for the sake of convenience and may differ from the actual proportions.

[0011] [Terminal-attached wire] 1, an electric wire with terminal 10 includes an electric wire 11 and a terminal 12 connected to an end of the electric wire 11. In this embodiment, an electric wire with terminal 10 in which the terminal 12 is connected to the end of the electric wire 11 will be described as an example of a joined body.

[0012] The electric wire 11 is an insulated electric wire having a conductor member (core wire 21) made of a conductive material and an insulating sheath portion 22 as an outer sheath that covers the periphery of the core wire 21. The core wire 21 is configured by bundling together a plurality of strands made of a conductive metal material such as copper, copper alloy, aluminum, or aluminum alloy. The material of the conductor member is not limited to copper, copper alloy, aluminum, aluminum alloy, or the like, and may be other conductive metal materials. Furthermore, the structure of the conductor material is not limited to a twisted wire in which a plurality of strands are twisted together, and may be in other forms (single core wire, braid, FPC (flexible thin electric cable), etc.).

[0013] In the electric wire with terminal 10, the electric wire 11 has a core wire 21 and an insulating sheath 22 that covers the core wire 21 while leaving a portion of the core wire 21 exposed. The insulating sheath 22 is made of a flexible and insulating resin material. The material and structure of the insulating sheath 22 are not particularly limited. At the end of the electric wire 11, the insulating sheath 22 is removed to expose a portion of the core wire 21. When the core wire 21 is made of multiple strands made of copper or a copper alloy, each strand may be plated with tin, nickel, silver, gold, or the like. Furthermore, the type of plating applied to each strand or core wire is not particularly limited.

[0014] The terminal 12 is formed by processing a plate material made of a conductive metal material. In this embodiment, the terminal 12 is formed by processing a plate material (base material) made of copper or a copper alloy. The material of the base material of the terminal 12 is not limited to copper or a copper alloy, and may be other conductive metal materials. Furthermore, the base material of the terminal 12 may be plated with tin, nickel, silver, gold, or the like. Furthermore, the type of plating applied to the base material of the terminal 12 is not particularly limited.

[0015] The terminal 12 is formed as a flat terminal body 30, and this terminal 12 (terminal body 30) has an electrical connection portion 31 and a conductor connection portion (electric wire connection portion 32). The terminal 12 (terminal body 30) may further have a coating crimping portion (rear leg portion) having a pair of crimping pieces that are crimped to the insulating coating portion 22 at the end of the electric wire 11.

[0016] The electrical connection portion 31 of the terminal 12 has a hole 33 that penetrates the front and rear surfaces of the terminal body 30. This electrical connection portion 31 is electrically connected by inserting a fastening member such as a bolt or a screw through the hole 33 and fastening it to a connected portion of various devices, etc. The shape of the electrical connection portion 31 formed at the front end of the terminal 12 is not particularly limited and may be, for example, a male type, a female type, or an LA (round) type.

[0017] The terminal 12 has a wire connection portion 32 to which the core wire 21 of the electric wire 11 is joined. One surface of the wire connection portion 32 of the terminal 12 is a conductor joining surface 35, and the core wire 21 of the electric wire 11 is joined to this conductor joining surface 35. The core wire 21 of the electric wire 11 is joined to the conductor joining surface 35 of the wire connection portion 32 by ultrasonic joining. In this way, the terminal 12 and the core wire 21 of the electric wire 11 are electrically connected.

[0018] The electric wire with terminal 10 may be provided with an exterior member such as a heat-shrinkable tube, a resin material, or a sheet that is applied to the joint (electric wire connection portion 32) between the terminal 12 and the core wire 21 of the electric wire 11 for the purpose of waterproofing, corrosion prevention, etc.

[0019] In this embodiment, one electric wire 11 is joined to the terminal 12, but a plurality of electric wires may be joined together as in a joint terminal. In the case where a plurality of electric wires are joined together, this embodiment can be applied to, for example, a bus bar. In other words, the terminal 12 may have a plurality of conductor connecting portions (electric wire connecting portions 32).

[0020] As shown in FIGS. 1 to 5 , the conductor joining surface 35 of the wire connection portion 32 to which the core wire 21 of the electric wire 11 is joined is formed with concave serrations 40 (two serrations 40 in this embodiment) extending along the width direction of the terminal 12 (a direction perpendicular to the longitudinal direction). As shown in FIG. 5 , during ultrasonic joining, the serrations 40 on the conductor joining surface 35 and the convex portion 80 of the horn 61 of the ultrasonic joining machine are aligned on a straight line La parallel to the height direction of the core wire 21. Therefore, during ultrasonic joining, the portion of the core wire 21 that is locally pressed vertically downward by the convex portion 80 of the horn 61 is pushed more strongly toward the wire connection portion 32 than other portions of the core wire 21, causing plastic flow and reaching the interior of the serrations 40 of the wire connection portion 32. Therefore, the contact area between the core wire 21 and the wire connection portion 32 can be increased compared to a shape without the serrations 40. Therefore, the electric wire with terminal 10 can be manufactured with improved joint strength between the terminal 12 and the core wire 21.

[0021] From the viewpoint of increasing the contact area between the core wire 21 and the wire connection portion 32, it is preferable that the length of the serrations 40 is at least equal to the length of the protrusions 80 of the horn 61. Furthermore, it is more preferable that the serrations 40 extend across the entire width of the terminal 12 on the conductor joint surface 35, as shown in FIG.

[0022] In the electric wire with terminal 10, the core wire 21 and the terminal 12 are ultrasonically joined together with the core wire 21 in contact with the serrations 40. Meanwhile, as shown in FIG. 1 , on the side of the core wire 21 opposite to the side joined to the terminal 12 (conductor joining surface 35), a joining mark 90 is formed where a convex portion 80 of a horn 61 of an ultrasonic joining machine made contact. As described above, ultrasonic joining is performed with the serrations 40 of the conductor joining surface 35 and the convex portion 80 of the horn 61 aligned on a straight line La parallel to the height direction of the core wire 21. Therefore, the centers of the serrations 40 of the electric wire connection portion 32 and the center of the joining mark 90 are aligned on a straight line La parallel to the height direction of the core wire 21.

[0023] FIG. 6 shows an example of the serrations 40, illustrating an enlarged view of the serrations 40 formed on the conductor joint surface 35 of the wire connection portion 32. The serrations 40 are formed in a concave shape having a bottom surface 43 and side surfaces 45, and open at openings 44. From the viewpoint of increasing the contact area between the core wire 21 and the conductor joint surface 35, it is preferable that the width Sa of the openings 44 of the serrations 40 be larger than the width Sb of the bottom surface 43 of the serrations 40. The angle θ of the side surfaces 45 relative to the normal line Lb to the bottom surface 43, i.e., the angle θ of the side surfaces 45 relative to the depth direction of the serrations 40, is preferably greater than 0°, and more preferably between 45° and 75°. By setting the angle θ of the side surfaces 45 relative to the normal line Lb to the bottom surface 43 to be 45° or greater, the contact area between the core wire 21 and the wire connection portion 32 can be effectively increased. The shape of the serrations 40 is not limited to this, and the cross-sectional shape may be, for example, a square, a triangular, or an arcuate shape.

[0024] The depth of the serrations 40 is not particularly limited, and may be greater than the surface roughness of the conductor mating surface 35 of the terminal 12 and less than the diameter (height) of the core wire 21. The width of the serrations 40 is not particularly limited. The shapes of the serrations 40 may be the same or different. Furthermore, the number of serrations 40 is not particularly limited.

[0025] There is no particular limitation on the manufacturing method (molding method) of the serrations 40. For example, the serrations 40 may be formed when the terminal 12 (terminal body 30) is subjected to press processing (punching, bending, etc.) using a mold.

[0026] The horn 61 of the ultrasonic bonding machine is formed with protrusions 80 extending along the width direction of the terminal 12. The height, width, and length of the protrusions 80 are not particularly limited. The shape of the protrusions 80 is also not particularly limited, and for example, the cross-sectional shape may be rectangular, triangular, or arc-shaped. The shapes of the protrusions 80 may be the same or different. The number of protrusions 80 is also not particularly limited, but it is preferable that the number be the same as the number of serrations 40.

[0027] There are no particular limitations on the manufacturing method (molding method) of protrusions 80. For example, protrusions 80 may be formed when horn 61 is subjected to press processing (punching, bending, etc.) using a mold.

[0028] As described above, the electric wire with terminal 10 of this embodiment includes the electric wire 11 having the core wire 21 and the insulator covering portion 22 that covers the core wire 21 while leaving a portion of the core wire 21 exposed, and the terminal 12 having the wire connection portion 32 to which the core wire 21 of the electric wire 11 is joined. Concave serrations 40 extending along the width direction of the terminal 12 are formed on the conductor joining surface 35 of the wire connection portion 32, and the core wire 21 and the terminal 12 are joined by ultrasonic joining with the core wire 21 in contact with the serrations 40. Then, on the side of the core wire 21 opposite the side joined to the terminal 12, a joining mark 90 is formed where the convex portion 80 of the horn 61 of the ultrasonic joining machine made contact, and the centers of the serrations 40 and the joining mark 90 are aligned on a straight line parallel to the height direction of the core wire 21.

[0029] In the electric wire with terminal, serrations 40 extending along the width direction of the terminal 12 are formed on the conductor joining surface 35 of the wire connection portion 32 to which the core wire 21 of the electric wire 11 is joined. During ultrasonic joining, the serrations 40 on the conductor joining surface 35 and the convex portion 80 of the horn 61 of the ultrasonic joining machine are arranged to align on a straight line La parallel to the height direction of the core wire 21. Therefore, the portion of the core wire 21 locally pressed vertically downward by the convex portion 80 of the horn 61 reaches the inside of the serrations 40 of the wire connection portion 32, thereby increasing the contact area of ​​the core wire 21 with the wire connection portion 32. As described above, the electric wire with terminal 10 of this embodiment can provide an electric wire with terminal that increases the contact area of ​​the electric wire core with the terminal and improves the joint strength between the terminal and the electric wire core.

[0030] [Method of joining terminal-attached wires] Next, a description will be given of a method for joining the electric wire with terminal 10 according to this embodiment. The method for joining the electric wire with terminal 10 is a method for joining, by ultrasonic bonding, an electric wire 11 having a core wire 21 and an insulating coating portion 22 that covers the core wire 21 while leaving a part of the core wire 21 exposed, to a terminal 12 having an electric wire connection portion 32 to which the core wire 21 of the electric wire 11 is joined.

[0031] The method for joining the electric wire with terminal 10 involves clamping the terminal 12 and the core wire 21 of the electric wire 11 using the horn 61 and anvil 71 of an ultrasonic joining machine and joining them by ultrasonic joining. Concave serrations 40 extending along the width direction of the terminal 12 are formed on the conductor joining surface 35 of the electric wire connection portion 32 of the terminal 12. Meanwhile, convex portions 80 extending along the width direction of the terminal 12 are formed on the horn 61 of the ultrasonic joining machine.

[0032] In the method for joining the electric wire with terminal 10 according to this embodiment, first, the terminal 12 and the core wire 21 of the electric wire 11 are placed in an ultrasonic joining machine equipped with a horn 61 and an anvil 71. Specifically, as shown in FIG. 3, the method includes a step of placing the terminal 12 on top of the anvil 71 of the ultrasonic joining machine, and then placing the core wire 21 on top of the electric wire connection portion 32 (conductor joining surface 35) of the terminal 12. Next, as shown in FIGS. 4 and 5, the method includes a step of arranging the serrations 40 of the electric wire connection portion 32 and the center of the protrusion 80 of the horn 61 so that they are aligned on a straight line La parallel to the height direction of the core wire 21. Note that both widthwise sides of the terminal 12 may be held using terminal pressers (not shown).

[0033] The method for joining the terminal-equipped electric wire 10 includes a step of bringing the horn 61 into contact with the core wire 21, and with the core wire 21 in contact with the serrations 40 and the protrusions 80, applying pressure to the horn 61 in a vertically downward direction to vibrate it, thereby joining the core wire 21 and the terminal 12 by ultrasonic joining.

[0034] Horn 61 of the ultrasonic bonding machine is equipped with a vibrator (not shown) that generates ultrasonic vibrations when powered by AC current, and is vibrated by this vibrator. Terminal 12 and core wire 21, which are arranged above anvil 71 and are placed between horn 61 and anvil 71, are clamped between horn 61 and anvil 71 by the load from horn 61.

[0035] After the terminal 12 and the core wire 21 are placed between the horn 61 and the anvil 71, the horn 61 is moved toward the anvil 71. As a result, the terminal 12 and the core wire 21 are clamped between the horn 61 and the anvil 71 while being pressed against each other. In this state, an AC current is supplied to the vibrator. The vibrator then ultrasonically vibrates the horn 61 in the horizontal direction, transmitting ultrasonic vibration energy to the terminal 12 and the core wire 21, and ultrasonically joining the core wire 21 of the electric wire 11 to the conductor joining surface 35 of the terminal 12. As a result, a terminal-attached electric wire 10 is obtained in which the electric wire 11 is connected to the terminal 12.

[0036] In this embodiment, as described above, during ultrasonic bonding, the center of the serrations 40 on the conductor bonding surface 35 and the center of the convex portion 80 of the horn 61 of the ultrasonic bonding machine are aligned on a straight line La parallel to the height direction of the core wire 21. Therefore, during ultrasonic bonding, the portion of the core wire 21 that is locally pressed vertically downward by the convex portion 80 of the horn 61 is pushed more strongly toward the wire connection portion 32 than other portions of the core wire 21, causing plastic flow and reaching the inside of the serrations 40 of the wire connection portion 32. Therefore, the contact area between the core wire 21 and the wire connection portion 32 can be increased compared to a shape without the serrations 40. This makes it possible to provide a method for joining an electric wire with a terminal 10 that improves the bonding strength between the terminal 12 and the core wire 21.

[0037] After ultrasonic bonding, a bonding mark 90 where the convex portion 80 of the horn 61 was in contact is formed on the side of the core wire 21 opposite to the side bonded to the terminal 12, and the center of the serration 40 and the center of the bonding mark 90 are aligned on a straight line La parallel to the height direction of the core wire 21.

[0038] Furthermore, in the method for joining the terminal-fitted electric wire 10, as described above, it is preferable that the serrations 40 extend across the entire width of the terminal 12 on the conductor joining surface 35.

[0039] Furthermore, in the method of joining the electric wire with terminal 10, as shown in Figures 3 to 5, it is preferable that the anvil 71 has a protrusion 100 on the surface that comes into contact with the terminal 12. By providing the protrusion 100 on the anvil 71, the terminal 12 can be fixed so that it does not move from the anvil 71 due to vibration during ultrasonic joining.

[0040] As described above, the method for joining an electric wire with terminal 10 according to the present embodiment is a method for joining an electric wire 11 having a core wire 21 and an insulating covering 22 that covers the core wire 21 while leaving a portion of the core wire 21 exposed, to a terminal 12 having an electric wire connection portion 32 to which the core wire 21 of the electric wire 11 is joined. The method for joining an electric wire with terminal 10 includes clamping the electric wire 11 and the terminal 12 between the horn 61 and the anvil 71 of an ultrasonic joining machine and joining them by ultrasonic joining. The conductor joining surface 35 of the wire connection portion 32 is formed with concave serrations 40 extending in the width direction of the terminal 12, and the horn 61 is formed with convex portions 80 extending in the width direction of the terminal 12. The joining method includes a step of placing the terminal 12 on top of the anvil 71 and then placing the core wire 21 on top of the wire connection portion 32 of the terminal 12. This joining method includes a step of arranging the centers of the serrations 40 and the protrusions 80 so that they are aligned on a straight line parallel to the height direction of the core wire 21. This joining method includes a step of bringing the horn 61 into contact with the core wire 21, and with the core wire 21 in contact with the serrations 40 and the protrusions 80, applying pressure to the horn 61 in a vertically downward direction to vibrate the horn 61, thereby ultrasonically joining the core wire 21 and the terminal 12. After ultrasonic joining, a joining mark 90 where the protrusions 80 of the horn 61 were in contact is formed on the side of the core wire 21 opposite the side joined to the terminal 12, and the centers of the serrations 40 and the joining mark 90 are aligned on a straight line parallel to the height direction of the core wire 21.

[0041] In the above-described method for joining an electric wire with a terminal, serrations 40 extending along the width direction of the terminal 12 are formed on the conductor joining surface 35 of the wire connecting portion 32 to which the core wire 21 of the electric wire 11 is joined. During ultrasonic joining, the serrations 40 on the conductor joining surface 35 and the convex portion 80 of the horn 61 of the ultrasonic joining machine are arranged to align on a straight line La parallel to the height direction of the core wire 21. Therefore, the portion of the core wire 21 locally pressed vertically downward by the convex portion 80 of the horn 61 reaches the inside of the serrations 40 of the wire connecting portion 32, thereby increasing the area of ​​contact between the core wire 21 and the wire connecting portion 32. This makes it possible to provide a method for joining an electric wire with a terminal 10 with improved joining strength between the terminal 12 and the core wire 21.

[0042] As described above, the method for joining the electric wire with terminal 10 of this embodiment can provide an electric wire with terminal with improved joining strength between the terminal and the electric wire core by increasing the contact area between the electric wire core and the terminal.

[0043] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment. [Explanation of symbols]

[0044] 10 Wires with terminals 11 Electric wire 12 terminals 21 Core Wire 22 Insulating coating 32 Wire connection 35 Conductor joint surface 40 serrations 61 Horn 71 Anvil 80 convex part 90 Joining marks 100 protrusions

Claims

1. an electric wire having a core wire and an insulating coating portion that coats the core wire while leaving a part of the core wire exposed; a terminal having a wire connection portion to which the core wire of the electric wire is joined, a conductor joining surface of the wire connecting portion is formed with a concave serration extending along the width direction of the terminal; The core wire and the terminal are joined by ultrasonic welding while the core wire is in contact with the serrations, In the core wire, a joining mark where a protrusion of a horn of an ultrasonic joining machine came into contact is formed on the side opposite to the side joined to the terminal, The electric wire with terminal, wherein the center of the serration and the center of the joining mark are arranged to be aligned on a straight line parallel to the height direction of the core wire.

2. The electric wire with terminal according to claim 1 , wherein the serrations extend across the entire width of the terminal on the conductor joining surface.

3. A method for joining an electric wire with a terminal, comprising: clamping an electric wire having a core wire and an insulating coating portion that covers the core wire while leaving a part of the core wire exposed; and a terminal having an electric wire connection portion to which the core wire of the electric wire is joined between a horn and an anvil of an ultrasonic joining machine, and joining them by ultrasonic joining, a conductor joining surface of the wire connecting portion is formed with a concave serration extending along the width direction of the terminal; The horn has a protrusion extending along the width direction of the terminal, The joining method includes: a step of placing the terminal on the top of the anvil, and then placing the core wire on top of the wire connection portion of the terminal; a step of arranging the serrations and the protrusions so that the centers of the serrations and the protrusions are aligned on a straight line parallel to the height direction of the core wire; bringing the horn into contact with the core wire, and in a state in which the core wire is in contact with the serrations and the protrusions, applying pressure to the horn in a vertically downward direction to vibrate the horn, thereby joining the core wire and the terminal by ultrasonic joining, After ultrasonic bonding, a bonding mark where the protrusion of the horn had been in contact is formed on the side of the core wire opposite to the side bonded to the terminal, The method for joining an electric wire with a terminal, wherein the center of the serration and the center of the joining mark are arranged to be aligned on a straight line parallel to the height direction of the core wire.

4. The method for joining an electric wire with a terminal according to claim 3 , wherein the serrations extend across the entire width of the terminal on the conductor joining surface.

5. The method for joining an electric wire with a terminal according to claim 3 or 4, wherein the anvil has a protrusion on a surface that comes into contact with the terminal.

Images