阅读说明：本技术 带端子的电线以及带端子的电线的制造方法 (Terminal-equipped electric wire and method for manufacturing terminal-equipped electric wire ) 是由 佐藤知哉 伊藤直树 锅田泰德 于 2019-05-06 设计创作，主要内容包括：提供一种能够用简单的构成提高电气性能的带端子的电线。带端子的电线(1)具备：电线,电线具有：具有多个裸线(32)的芯线(31)和以使芯线的端部露出的状态来将芯线覆盖的覆皮；以及压接端子(2),压接端子(2)具有芯线压接部(12),芯线压接部(12)以使芯线的前端突出到外部的状态相对于芯线被压接,芯线的前端(31b)具有多个裸线彼此接合而成的接合部(34),接合部是使多个裸线的前端剪切变形而形成的。(provided is a terminal-equipped electric wire which can improve the electric performance with a simple configuration. A terminal-equipped wire (1) is provided with: an electric wire having: a core wire (31) having a plurality of bare wires (32) and a sheath covering the core wire in a state in which an end portion of the core wire is exposed; and a crimp terminal (2), wherein the crimp terminal (2) has a core wire crimping section (12), the core wire crimping section (12) is crimped with respect to the core wire in a state in which the tip of the core wire protrudes to the outside, the tip (31b) of the core wire has a joint section (34) in which a plurality of bare wires are joined to each other, and the joint section is formed by shear-deforming the tips of the plurality of bare wires.)

1. A terminal-equipped electric wire characterized in that,

The disclosed device is provided with:

An electric wire having: a core wire having a plurality of bare wires and a sheath covering the core wire in a state where an end portion of the core wire is exposed; and

A crimp terminal having a core wire crimping portion which is crimped to the core wire in a state where a leading end of the core wire is projected to the outside,

The front end of the core wire has a joint portion formed by joining a plurality of the bare wires,

The joint is formed by shear-deforming the tips of the bare wires.

2. The electric wire with terminal according to claim 1,

The front end surface of the core wire is an inclined surface inclined with respect to the axial direction of the electric wire.

3. The terminal-equipped electric wire according to claim 1 or 2,

The front ends of the bare wires are sheared and deformed in a common direction at the front end surface of the core wire.

4. The terminal-equipped electric wire according to claim 1 or 2,

The front end face of the core wire comprises a first face and a second face adjacent to each other,

The leading ends of the bare wires are shear-deformed in the first surface in a direction from the first surface toward the second surface,

At the second surface, leading ends of the bare wires are shear-deformed in a direction from the second surface toward the first surface.

5. A method for manufacturing a terminal-equipped wire, comprising:

A joining step of forming a joint portion in which a plurality of bare wires constituting a core wire of an electric wire are joined to each other by shear-deforming tips of the plurality of bare wires; and

A crimping step of crimping a core wire crimping portion of a crimp terminal to the core wire.

6. The method of manufacturing a terminated electric wire according to claim 5,

A terminal crimping device that performs the joining step and the crimping step, the terminal crimping device including a crimper and a working tool that moves in conjunction with the crimper,

In the joining step, the joining portion is formed by shear-deforming the tip of the bare wire with the machining tool,

In the crimping step, the core wire crimping section is crimped to the core wire by the crimper.

7. The method of manufacturing a terminated electric wire according to claim 5,

In the crimping step, the tip end of the core wire is further covered from the outer peripheral side by a covering portion provided in the crimp terminal.

8. A terminal-equipped electric wire characterized in that,

The disclosed device is provided with:

An electric wire having: a core wire having a plurality of bare wires and a sheath covering the core wire in a state where an end portion of the core wire is exposed; and

A crimp terminal having a core wire crimp part crimped to the core wire,

A joint part formed by mutually joining the front ends of the bare wires is formed at the front end of the core wire,

the crimp terminal has a covering portion that covers a front end of the core wire from an outer peripheral side.

Technical Field

The present invention relates to a terminal-equipped electric wire and a method for manufacturing the terminal-equipped electric wire.

Background

Conventionally, there is an electric wire with a terminal. Patent document 1 discloses a technique of an electric wire with a terminal fitting, including: a terminal fitting is attached to a tip end portion of an electric wire having a core wire in which a plurality of bare metal wires are twisted, and solder is attached to a cut end surface of the core wire. In patent document 1, the solder is attached by a flow method in which the tip end portion of the core wire is immersed in a solder tank in which molten solder is stored.

Disclosure of Invention

Technical problem to be solved by the invention

In the electric wire with terminal, it is desired to improve the electric performance with a simple configuration. For example, if the resistance can be reduced without adding additional materials such as solder or additional components, the configuration can be simplified.

The invention aims to provide a terminal-equipped wire and a method for manufacturing the terminal-equipped wire, which can improve the electrical performance by a simple structure.

Means for solving the problems

The terminal-equipped electric wire according to the present invention is characterized by comprising: an electric wire having: a core wire having a plurality of bare wires and a sheath covering the core wire in a state where an end portion of the core wire is exposed; and a crimp terminal having a core wire crimp portion which is crimped with respect to the core wire in a state in which a leading end of the core wire is projected to the outside, the leading end of the core wire having a joint portion in which a plurality of the bare wires are joined to each other, the joint portion being formed by shear-deforming leading ends of the plurality of the bare wires.

Effects of the invention

The present invention relates to a terminal-equipped wire, including: an electric wire having: a core wire having a plurality of bare wires and a sheath covering the core wire in a state where an end portion of the core wire is exposed; and a crimp terminal having a core wire crimping portion which is crimped with respect to the core wire in a state in which a leading end of the core wire is projected to the outside. The distal end of the core wire has a joint portion in which a plurality of bare wires are joined to each other, and the joint portion is formed by shear-deforming the distal ends of the plurality of bare wires. According to the electric wire with terminal of the present invention, the electric performance can be improved with a simple configuration without adding an additional material.

drawings

Fig. 1 is a perspective view of a terminal-equipped electric wire according to embodiment 1.

Fig. 2 is a side view of the terminal-equipped electric wire according to embodiment 1.

Fig. 3 is an enlarged view of a main portion of the terminal-equipped electric wire according to embodiment 1.

Fig. 4 is a cross-sectional view showing a joint portion of the terminal-equipped wire according to embodiment 1.

Fig. 5 is a plan view of the electric wire according to embodiment 1.

Fig. 6 is a diagram illustrating the removal step of embodiment 1.

Fig. 7 is a front view of the terminal crimping device according to embodiment 1.

Fig. 8 is a sectional view of the terminal crimping device according to embodiment 1.

Fig. 9 is a front view showing the pressure bonding step and the bonding step of embodiment 1.

Fig. 10 is a cross-sectional view showing the pressure bonding step and the bonding step of embodiment 1.

Fig. 11 is a side view showing the bonding process of embodiment 1.

Fig. 12 is a sectional view illustrating the bonding step of embodiment 1.

Fig. 13 is a front view showing an example of the shape of the machining tool.

Fig. 14 is a front view showing another example of the shape of the processing tool.

Fig. 15 is a front view showing still another example of the shape of the processing tool.

Fig. 16 is a front view illustrating the relief portion of the machining tool.

Fig. 17 is a side view illustrating an escape portion of the machining tool.

Fig. 18 is a front view showing still another example of the shape of the processing tool.

fig. 19 is a front view of the joining process.

Fig. 20 is a cross-sectional view showing an example of the shape of the processing tool.

Fig. 21 is a cross-sectional view showing another example of the shape of the processing tool.

Fig. 22 is a cross-sectional view showing still another example of the shape of the processing tool.

Fig. 23 is a cross-sectional view showing still another example of the shape of the processing tool.

fig. 24 is a front view for explaining a bonding step according to modification 1 of embodiment 1.

Fig. 25 is a cross-sectional view for explaining the bonding step according to modification 1 of embodiment 1.

Fig. 26 is a front view for explaining a bonding step according to modification 2 of embodiment 1.

Fig. 27 is a cross-sectional view for explaining a bonding step according to modification 2 of embodiment 1.

Fig. 28 is a front view for explaining a bonding step according to modification 3 of embodiment 1.

Fig. 29 is a cross-sectional view for explaining a bonding step according to modification 3 of embodiment 1.

Fig. 30 is a sectional view of the core wire having completed the jointing process.

Fig. 31 is a front view for explaining a bonding step according to a 4 th modification of embodiment 1.

Fig. 32 is a cross-sectional view for explaining the bonding step according to modification 4 of embodiment 1.

Fig. 33 is a cross-sectional view for explaining a bonding step according to modification 5 of embodiment 1.

Fig. 34 is a front view for explaining the cutting step and the joining step according to embodiment 2.

Fig. 35 is a cross-sectional view illustrating the cutting step and the joining step according to embodiment 2.

Fig. 36 is another cross-sectional view for explaining the cutting step and the joining step according to embodiment 2.

Fig. 37 is a sectional view illustrating formation of a joint portion.

Fig. 38 is a side view showing the cut electric wire.

Fig. 39 is a sectional view illustrating an installation step of embodiment 2.

Fig. 40 is a side view of the terminal-equipped electric wire according to embodiment 2.

Fig. 41 is a front view showing an example of the shape of the cutting device.

Fig. 42 is a front view showing another example of the shape of the cutting device.

Fig. 43 shows an example of a cross-sectional shape of the cutting blade.

Fig. 44 is a sectional view showing another example of the sectional shape of the cutting blade.

Fig. 45 is a side view of the cutting device cutting the core wire in an oblique direction.

Fig. 46 is a side view of the electric wire formed with the engaging portion.

Fig. 47 is a sectional view of the electric wire formed with the joint portion.

Fig. 48 is a side view of a cutting device having two cutting edges.

Fig. 49 is a side view of a cut wire.

Fig. 50 is a sectional view of the electric wire on which the engaging portion has been formed.

Fig. 51 is a front view for explaining the pressure bonding step according to modification 1 of embodiment 2.

Fig. 52 is a cross-sectional view illustrating the pressure bonding step according to modification 1 of embodiment 2.

Fig. 53 is a front view of a terminal-equipped wire according to modification 1 of embodiment 2.

Fig. 54 is a side view of a terminal-equipped wire according to modification 1 of embodiment 2.

Fig. 55 is a cross-sectional view of a terminal-equipped wire according to modification 1 of embodiment 2.

Fig. 56 is a cross-sectional view showing an example of the shape of the covering portion.

Fig. 57 is a cross-sectional view showing another example of the shape of the covering portion.

Fig. 58 is a front view showing a crimp terminal according to a 2 nd modification of embodiment 2.

Fig. 59 is a side view showing a crimp terminal according to modification 2 of embodiment 2.

fig. 60 is a front view of a terminal-equipped wire according to modification 2 of embodiment 2.

Fig. 61 is a side view of a terminal-equipped wire according to modification 2 of embodiment 2.

Fig. 62 is a cross-sectional view of a terminal-equipped wire according to modification 2 of embodiment 2.

Fig. 63 is a cross-sectional view for explaining the cutting step according to modification 3 of embodiment 2.

Fig. 64 is another cross-sectional view for explaining the cutting step according to modification 3 of embodiment 2.

Fig. 65 is a sectional view of the electric wire formed with the joint portion.

Fig. 66 is a cross-sectional view illustrating a removing step according to modification 3 of embodiment 2.

Fig. 67 is a front view showing an example of the cutting process.

Fig. 68 is a cross-sectional view showing an example of the cutting step.

Fig. 69 is another cross-sectional view showing an example of the cutting step.

Fig. 70 is a sectional view of the cut electric wire.

fig. 71 is a sectional view illustrating the removal step.

Fig. 72 is a front view showing an example of the cutting step.

Fig. 73 is a cross-sectional view showing an example of the cutting step.

Fig. 74 is another cross-sectional view showing an example of the cutting step.

Fig. 75 is a sectional view of a cut electric wire.

fig. 76 is a sectional view for explaining the removal step.

Description of the symbols

1 electric wire with terminal

2 crimping terminal

3 electric wire

11 connecting part

12 core wire crimping part

13 connecting part

14 skin crimping part

15. 18 bottom

16A first pressing sheet

16B second pressing sheet

17A, 17B compressing sheet

19 side wall part

20. 23 covering part

21A, 25A first covering sheet

21B, 25B second covering sheet

22. 24 bottom

31 core wire

31a end part

31b front end

31c front end face

31d, 31f first side

31e, 31g second face

32 bare wire

32a outer peripheral surface

32b front end face

33 coating leather

34 joint part

40 cutting device

41 locus of containment

41a bearing surface

42. 48, 49 cutting edge

43. 45 groove part

44, 46, 47a, 47b, 50 inclined surface

100 terminal crimping device

110 first mould

111 first anvil

112 second anvil

113 third anvil

114 fourth anvil

120 second die

121 first crimping tool

122 second crimper

123 third crimper

130. 140, 150 working tool

131 inclined plane

132 side surface

133 escape part

134 pressing surface

135 convex curved surface

136 concave curved surface

151 first sliding part

152 second sliding part

151a, 152a knife tip

L first direction

W second direction

H third direction

Detailed Description

Hereinafter, a terminal-equipped wire and a method for manufacturing the terminal-equipped wire according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment. The components in the following embodiments include components that can be easily conceived by those skilled in the art or substantially the same components.

[ embodiment 1 ]

Embodiment 1 is explained with reference to fig. 1 to 23. The present embodiment relates to a terminal-equipped wire and a method for manufacturing the terminal-equipped wire. Fig. 1 is a perspective view of a terminal-equipped wire according to embodiment 1, fig. 2 is a side view of the terminal-equipped wire according to embodiment 1, fig. 3 is an enlarged view of a main portion of the terminal-equipped wire according to embodiment 1, fig. 4 is a cross-sectional view showing a joint portion of the terminal-equipped wire according to embodiment 1, fig. 5 is a plan view of the wire according to embodiment 1, fig. 6 is a plan view of the wire according to embodiment 1, fig. 7 is a front view of the terminal crimping device according to embodiment 1, fig. 8 is a cross-sectional view of the terminal crimping device according to embodiment 1, fig. 9 is a front view showing a crimping step and a joining step of embodiment 1, fig. 10 is a cross-sectional view showing a crimping step and a joining step of embodiment 1, fig. 11 is a side view showing the joining step of embodiment 1, fig. 12 is a sectional view illustrating the bonding step of embodiment 1. Fig. 8 shows a section VIII-VIII of fig. 7. Fig. 10 shows the X-X section of fig. 9.

As shown in fig. 1 and 2, a terminal-equipped wire 1 of the present embodiment includes a crimp terminal 2 and a wire 3. The crimp terminal 2 is a terminal crimped with respect to the electric wire 3. The crimp terminal 2 is electrically connected to a mating terminal (not shown) in an integrated state with the electric wire 3. The sheath 33 is removed from the end of the wire 3 to be crimped so that the core wire 31 is exposed to a predetermined length. The core wire 31 of the present embodiment is an aggregate of a plurality of bare wires 32. The bare wire 32 is made of a metal having conductivity, such as copper or aluminum. The crimp terminal 2 is crimped to an end of the electric wire 3, thereby being electrically connected to the exposed core wire 31.

The crimp terminal 2 is formed of a conductive metal plate (e.g., a copper plate or a copper alloy plate) as a base material. The crimp terminal 2 is formed into a predetermined shape that can be connected to the mating terminal and the electric wire 3 by press working, bending working, or the like of the base material. The crimp terminal 2 includes a connection portion 11, a core wire pressure-bonding portion 12, a connection portion 13, and a sheath pressure-bonding portion 14.

In the following description, the longitudinal direction of the crimp terminal 2 is referred to as a "first direction L". The first direction L is an insertion direction of the crimp terminal 2 and the mate side terminal, and is an axial direction of the electric wire 3. The width direction of the crimp terminal 2 is referred to as "second direction W". The second direction W is a direction orthogonal to the first direction L. A direction orthogonal to both the first direction L and the second direction W is referred to as a "third direction H". The third direction H is a height direction of the crimp terminal 2. The third direction H is a direction in which the core wire crimping part 12 is pressed by the first mold 110 and the second mold 120 in a crimping step to be described later. In the first direction L, the front end side of the core wire 31 is referred to as "front side", and the side opposite to the front side is referred to as "rear side".

The coupling portion 11, the core wire pressure-bonding portion 12, the coupling portion 13, and the sheath pressure-bonding portion 14 are arranged in this order in the first direction L. The connection portion 11 is disposed at the forefront of the crimp terminal. The core wire crimping part 12 is crimped with respect to the core wire 31 of the electric wire 3. The sheath pressure-bonding section 14 is pressure-bonded to the sheath 33 of the electric wire 3. The core wire pressure-bonding section 12 and the sheath pressure-bonding section 14 are connected via the connection section 13. The coupling portion 11 extends from the core wire crimping portion 12 to the front side. The core wire crimping part 12 has a bottom part 15 and a pair of pressing pieces 16A, 16B. The pair of pressing pieces 16A and 16B are pieces extending from the end of the bottom portion 15. The sheath crimping portion 14 further has a pair of pressing pieces 17A, 17B.

The core wire pressure-bonding section 12 of the present embodiment is pressure-bonded to the core wire 31 in a state where the distal end 31b of the core wire 31 protrudes to the outside. A part of the core wire 31 including the leading end 31b protrudes forward from the core wire crimping part 12.

As shown in fig. 3 and 4, the distal end 31b of the core wire 31 has a joint 34. The bonding portion 34 is a portion where the plurality of bare wires 32 are bonded to each other. That is, as shown in fig. 4, the joint 34 is a portion where one bare wire 321 is metal-joined to its adjacent bare wire 322. The joint 34 of the present embodiment is formed by shear deformation of the tip of the bare wire 32, as will be described later. In the terminal-equipped electric wire 1 of the present embodiment, the bare wires 32 are electrically connected to each other via the joint 34. This improves the electrical performance of the terminal-equipped wire 1 due to the reduction in electrical resistance.

Hereinafter, a method for manufacturing the terminal-equipped wire according to the present embodiment will be described in detail. The method for manufacturing a terminal-equipped wire according to the present embodiment includes a removing step, an installing step, a joining step, and a crimping step.

(removal step)

The removing step is a step of removing a part of the sheath 33 from the electric wire 3 to expose the core wire 31. Fig. 5 shows the electric wire 3 before a part of the sheath 33 is removed. In the electric wire 3 shown in fig. 5, the entire core wire 31 is covered with the sheath 33 except for the end surface of the core wire 31. As shown in fig. 6, in the removing step, the tip end portion 33a of the sheath 33 is removed from the electric wire 3. By removing the distal end portion 33a, the end portion 31a of the core wire 31 is exposed from the sheath 33. The cross-sectional shape of the core wire 31 and the cross-sectional shape of each bare wire 32 are, for example, circular. However, the cross-sectional shape of the core wire 31 and the cross-sectional shape of the bare wire 32 are not limited to circular.

(setting step)

The setting step is a step of setting the electric wire 3 to the crimp terminal 2. In the setting step, the crimp terminal 2 and the electric wire 3 are set in the first mold 110 of the terminal crimping device 100. As shown in fig. 7 and 8, the terminal crimping device 100 includes a first die 110, a second die 120, and a working tool 130. The first mold 110 is a fixed mold and supports the crimp terminal 2. The second mold 120 is a movable mold that moves relative to the first mold 110 in the up-down direction.

As shown in fig. 8, the first mold 110 has a first anvil 111, a second anvil 112, and a third anvil 113. The first anvil 111 supports the core crimping part 12. The second anvil 112 supports the skinning crimp 14. The third anvil 113 supports the connection portion 11 and a terminal connection portion not shown. The terminal connecting portion is a portion of the crimp terminal 2 to which the counterpart side terminal is connected. The terminal connecting portion is connected to the core wire crimping portion 12 via the connecting portion 11.

the second die 120 has a 1 st crimper 121 and a second crimper 122. The first crimper 121 is opposed to the first anvil 111. The first crimper 121 crimps the core wire crimping part 12 so that the core wire crimping part 12 is crimped with respect to the core wire 31. The second crimper 122 is opposed to the second anvil 112. The second crimper 122 crimps the sheath crimp 14 so that the sheath crimp 14 is crimped against the sheath 33.

The working tool 130 is a member in which the joint 34 is formed at the leading end 31b of the core wire 31. The working tool 130 of the present embodiment is a pressing blade formed of metal or the like. The working tool 130 is fixed to the front surface side of the 1 st crimper 121. That is, the working tool 130 is disposed on the end surface of the second die 120 opposite to the second crimper 122. In the machining tool 130, the cutting edge 130a is a single blade. That is, one surface of the cutting edge 130a is an inclined surface 131 inclined toward one side with respect to the vertical direction. The inclined surface 131 is inclined so as to be away from the first crimper 121 as going toward the front end of the working tool 130. The other surface of the cutting edge 130a is a surface parallel to the vertical direction. As shown in fig. 7, the tip 130a is slightly bent downward. The position of the cutting edge 130a of the processing tool 130 is set so that the joining step is performed in parallel with the pressure bonding step.

In the setting process, the crimp terminal 2 is placed on the upper surface of the first mold 110. As shown in fig. 7 and 8, the core wire crimping part 12 of the crimp terminal 2 has a bottom part 15, a first pressing piece 16A, and a second pressing piece 16B. The core wire crimping part 12 is formed in a U-shape. The bottom portion 15 is a portion of the bottom wall of the core wire crimping portion 12 formed in a U-shape. The first pressing piece 16A and the second pressing piece 16B are portions of the side wall of the core wire crimping portion 12 formed in a U shape. The first pressing piece 16A extends from one end of the bottom portion 15 in the second direction W. The second pressing piece 16B extends from the other end of the bottom portion 15 in the second direction W.

The sheath pressure-bonding section 14 includes a pair of pressing pieces 17A and 17B (see fig. 1) similarly to the core pressure-bonding section 12. The pressing pieces 17A, 17B of the sheath crimping part 14 are formed spaced apart from the pressing pieces 16A, 16B of the core crimping part 12.

As shown in fig. 8, the crimp terminal 2 is placed in the first mold 110 such that the core wire crimping section 12 faces the first anvil 111, and the sheathed crimping section 14 faces the second anvil 112. More specifically, the crimp terminal 2 is placed such that the bottom portion 15 is supported by the first anvil 111 and the distal ends of the pair of pressing pieces 16A and 16B face the first crimper 121.

The electric wire 3 is provided to the crimp terminal 2 supported by the first mold 110. The electric wire 3 is provided in the crimp terminal 2 such that the end 31a of the core 31 faces the bottom portion 15 of the core pressure-bonding section 12 and the sheath 33 faces the bottom portion 18 of the sheath pressure-bonding section 14. The electric wire 3 is provided such that at least the tip 31b protrudes forward from the core crimping part 12. The wire 3 is provided such that the tip 31b faces the inclined surface 131 of the processing tool 130 in the third direction H.

(pressure bonding step)

In the method of manufacturing a terminal-equipped wire according to the present embodiment, the crimping step and the joining step described later are performed simultaneously. First, the pressure bonding step is explained. The pressure bonding step is a step of pressure bonding the core wire pressure-bonding section 12 to the core wire 31. In the crimping step, the core wire crimping section 12 is crimped to the core wire 31, and the sheath crimping section 14 is crimped to the sheath 33. In the crimping step, the crimp terminal 2 and the electric wire 3 are sandwiched between the first die 110 and the second die 120. The first die 110 and the second die 120 press the pressing pieces 16A and 16B against the core wire 31 and press the pressing pieces 17A and 17B against the sheath 33. In the press-bonding step, the second die 120 moves downward toward the first die 110.

The first crimper 121 has a curved surface 121a that deforms the crimping pieces 16A, 16B. The curved surface 121a deforms the pressure pieces 16A, 16B into a curved shape so that the leading ends 16d of the pressure pieces 16A, 16B face the first die 110. The first crimper 121 deforms the pressing pieces 16A, 16B to encase the core wire 31 with the pair of pressing pieces 16A, 16B and the bottom portion 15. Fig. 9 and 10 show a state in which the second die 120 is at the bottom dead center in the crimping step.

As shown in fig. 9, the first crimper 121 of the present embodiment performs a pressing operation called "B-crimping". The pressing pieces 16A and 16B are bent so that the cross-sectional shape of the core wire crimping portion 12 becomes a B-shape. The leading ends 16d of the pressing pieces 16A, 16B are directed downward and pressed against the core wire 31. The pressing pieces 16A, 16B press the core wire 31 toward the bottom portion 15. In addition, the pressing pieces 16A, 16B wrap the core wire 31 and press the core wire 31. The pressing pieces 17A and 17B of the sheath pressing portion 14 are deformed in the same manner as the pressing pieces 16A and 16B and are pressed against the sheath 33.

(joining Process)

The joining step is a step of forming a joint 34 to a plurality of core wires 32 constituting the core wire 31 of the electric wire 3. In the joining step of the present embodiment, the joint portion 34 is formed in the core wire 31 by the working tool 130. In the crimping step, when the second die 120 is lowered, the working tool 130 is lowered together with the second die 120. As shown in fig. 11 and 12, the processing tool 130 forms the joint 34 by shear-deforming the core wire 32.

More specifically, the inclined surface 131 and the side surface 132 of the working tool 130 contact the tip 31b of the core wire 31. The inclined surface 131 and the side surface 132 descend while sliding on the front end surface 31c of the front end 31 b. As shown in fig. 12, the tip of each bare wire 32 is pulled downward by the working tool 130 and is shear-deformed. With this shear deformation, the outer peripheral surface 32a of the bare wire 32 is stretched as indicated by arrow Y1, and the oxide film of the outer peripheral surface 32a is broken to create a new surface. In addition, the bare wires 32 slide against each other, so that the oxide film is also broken to expose a new surface. In addition, when the bare wire 32 is pressed, the oxide film is also broken to expose a new surface. The joint 34 is formed by bringing the new surfaces of the adjacent bare wires 32 into contact with each other and adhering them.

The distal end surface 32b of the bare wire 32 is also stretched as indicated by arrow Y2. Thereby, the oxide film is broken at the distal end surface 32b of the bare wire 32, and a new surface is exposed. In the adjacent bare wires 32, the new surfaces of the leading end surfaces 32b are metal-bonded to each other, or the new surfaces of the leading end surfaces 32b and the new surfaces of the outer peripheral surfaces 32a to form the joint portions 34. The machining tool 130 according to the present embodiment may scrape off the tip of each bare wire 32 to expose a new surface. That is, the machining tool 130 may generate a new surface by generating a new distal end surface 32b on the bare wire 32 by shearing and breaking each bare wire 32. As described above, in the terminal-equipped electric wire 1 according to the present embodiment, the distal ends of the plurality of bare wires 32 are shear-deformed in the common direction at the distal end surface 31c of the core wire 31. The direction of the shear deformation of the bare wire 32 is the moving direction of the processing tool 130, and is a direction toward the bottom portion 15 along the third direction H.

the processing tool 130 of the present embodiment is configured to be able to form the joint 34 on the bare wire 32 from the upper end to the lower end of the core wire 31. That is, the machining tool 130 is configured to be in contact with substantially all of the bare wires 32 from the upper bare wire 32 to the lower bare wire 32 and to be shear-deformed. Thus, when the bonding step is completed, as shown in fig. 3, the bonding portion 34 is formed in substantially all of the bare wires 32 from the upper bare wire 32 to the lower bare wire 32. As a result, substantially all of the bare wires 32 are in a state of being metal-bonded to each other. Thus, the electric wire with terminal 1 of the present embodiment reduces the resistance between the bare wires 32. The core wire pressure-bonding section 12 is also metal-bonded to the inner bare wire 32 via the bare wire 32 located on the outer periphery of the core wire 31. Thereby, the resistance of the core wire crimping part 12 and the core wire 31 is also reduced.

The shape of the machining tool 130 is not limited to the above-described exemplary shapes. For example, the shape of the working tool 130 may also be set to a shape corresponding to the sectional shape of the core crimping part 12. Fig. 13 shows an example of the shape of the machining tool 130. The cutting edge 130a of the machining tool 130 has a shape corresponding to the cross-sectional shape of the bottom 15. More specifically, the cross-sectional shape of the inner surface 15a of the bottom portion 15 is a curved shape that curves downward. The cutting edge 130a of the machining tool 130 has a curved shape corresponding to the curved shape of the inner surface 15 a. The cutting edge 130a has a curved shape in which the central portion in the second direction W protrudes downward beyond both end portions. This suppresses interference between the working tool 130 and the bottom portion 15 in the joining step.

In addition, the width Wd1 of the tool 130 is smaller than the width Wd2 of the base 15. The width Wd2 of the bottom portion 15 is, for example, the distance from the inner side surface of the first presser piece 16A to the inner side surface of the second presser piece 16B. By making the width Wd1 of the tool 130 smaller than the width Wd2 of the bottom portion 15, interference between the tool 130 and the crimp terminal 2 in the joining process is suppressed.

Fig. 14 shows another example of the shape of the working tool 130. In the core wire crimping part 12 shown in fig. 14, the sectional shape of the inner side surface 15a of the bottom part 15 is a linear shape. Accordingly, the cutting edge 130a of the machining tool 130 is also linear. The width Wd3 of the processing tool 130 is also smaller than the width Wd4 of the bottom portion 15.

Fig. 15 to 17 show another example of the shape of the machining tool 130. As shown in fig. 15, a relief portion 133 is formed in the processing tool 130. The relief portion 133 is a cut-out portion formed in the machining tool 130. The width Wd5 of the portion where the relief 133 is formed is narrower than the width Wd6 of the portion on the base end side. The relief portions 133 are formed at the distal end portion of the machining tool 130 and provided on both sides in the width direction. That is, in the machining tool 130, the width Wd5 of the tip end portion is narrower than the width Wd6 of the base end side portion.

The crimp terminal 2 shown in fig. 16 and 17 has a pair of side wall portions 19. The side wall portion 19 is a side wall portion continuous with the first pressing piece 16A and the second side wall portion 16B. The side wall portion 19 is formed on the coupling portion 11, for example. The relief portion 133 of the processing tool 130 is formed so as to suppress interference between the side wall portion 19 and the processing tool 130. As shown in fig. 16, the width Wd5 of the distal end portion of the processing tool 130 is equal to the width Wd7 of the space portion sandwiched by the side wall portions 19 or is narrower than the width Wd7 of the space portion. This suppresses interference between the working tool 130 and the crimp terminal 2 in the bonding step. The crimp terminal 2 may be formed with a relief portion. For example, the side wall portion 19 may have a portion facing the processing tool 130 at a lower height than an adjacent portion of the side wall portion 19.

Fig. 18 shows still another example of the shape of the machining tool 130. In the machining tool 130 shown in fig. 18, the cutting edge 130a has a curved shape in which both end portions in the second direction W protrude downward from a central portion in the second direction W. Therefore, as shown in fig. 19, in the joining step, the cutting edge 130a of the working tool 130 presses the front end 31b of the core wire 31 toward the center in the width direction. As indicated by an arrow Y3 in fig. 19, both end portions of the cutting edge 130a press the core wire 31 toward the center side in the second direction W. Thus, the leading end portions 31b of the core wires 31 are less likely to spread radially in the joining step.

The cross-sectional shape of the working tool 130 is not limited to the cross-sectional shape illustrated above. Fig. 20 shows an example of the cross-sectional shape of the working tool 130. In the machining tool 130 of fig. 20, the cutting edge 130a is provided with a pressing surface 134 having a constant width. The pressing surface 134 is a surface parallel to the first direction L.

Fig. 21 shows another example of the cross-sectional shape of the working tool 130. In the machining tool 130 of fig. 21, the cutting edge 130a has a curved surface in which the central portion protrudes more than both end portions in the first direction L. The shape of the center portion of the cutting edge 130a is, for example, an arc shape.

Fig. 22 shows still another example of the cross-sectional shape of the working tool 130. In the machining tool 130 of fig. 22, a convex curved surface 135 is provided instead of the inclined surface 131 shown in fig. 8. The convex curved surface 135 is formed on the rear side of the cutting edge 130a in the first direction L. The convex curved surface 135 is, for example, a curved surface having a substantially circular arc shape.

Fig. 23 shows still another example of the cross-sectional shape of the working tool 130. The machining tool 130 of fig. 23 is provided with a concave curved surface 136. The concavely curved surface 136 is formed on the rear side of the cutting edge 130a in the first direction L. The concave curved surface 136 is, for example, a curved surface having a substantially circular arc shape.

As described above, the terminal-equipped wire 1 according to the present embodiment includes the wire 3 and the crimp terminal 2. The electric wire 3 has: a core wire 31 having a plurality of bare wires 32; and a sheath 33 covering the core wire 31 in a state where an end portion of the core wire 31 is exposed. The crimp terminal 2 has a core wire crimp part 12, and the core wire crimp part 12 is crimped with respect to the core wire 31 in a state where a leading end 31b of the core wire 31 is exposed to the outside.

The distal end 31b of the core wire 31 has a joint 34 in which a plurality of bare wires 32 are joined to each other. The joint 34 is formed by shear-deforming the tips of the bare wires 32. According to the electric wire with terminal 1 of the present embodiment, the electric resistance of the electric wire with terminal 1 can be reduced without adding additional materials or components such as solder. That is, the terminal-equipped electric wire 1 according to the present embodiment can exhibit an effect of improving the electric performance with a simple configuration.

In the terminal-equipped electric wire 1 of the present embodiment, the distal ends of the plurality of bare wires 32 are shear-deformed in a common direction at the distal end surface 31c of the core wire 31. Such shear deformation is generally deformation that occurs by the working tool 130 sliding relative to the leading end 31b of the core wire 31. By forming the joint portion 34 by deforming the core wire 31, the electric performance of the terminated electric wire 1 can be improved with a simple configuration.

The method of manufacturing a terminal-equipped wire according to the present embodiment includes a joining step and a crimping step. The joining step is a step of forming a joint 34 in which the tips of the plurality of bare wires 32 are shear-deformed with respect to the plurality of bare wires 32 constituting the core wire 31 of the electric wire 3, and the bare wires 32 are joined to each other. The crimping step is a step of crimping the core wire crimping part 12 of the crimp terminal 2 against the core wire 31. The electric performance of the terminal-equipped electric wire 1 can be improved with a simple configuration by forming the joint 34 by shear-deforming the tip of the bare wire 32.

In the method of manufacturing a terminal-equipped wire according to the present embodiment, the joining step and the crimping step are performed simultaneously. Thus, according to the method for manufacturing the terminal-equipped wire of the present embodiment, the time required for manufacturing the terminal-equipped wire 1 can be shortened.

In the method of manufacturing the terminal-equipped electric wire according to the present embodiment, the terminal crimping apparatus 100 performs a joining step and a crimping step, and the terminal crimping apparatus 100 includes the first crimper 121 and the working tool 130 that moves in conjunction with the first crimper 130. In the terminal crimping step 100, the joining portion 34 is formed by shear-deforming the tip of the bare wire 32 with the working tool 130 in the joining step. In the terminal crimping apparatus 100, the core wire crimping section 12 is crimped to the core wire 31 by the first crimper 121 in the crimping step. The manufacturing process can be simplified by executing the joining process and the crimping process by the terminal crimping apparatus 100.

In the method of manufacturing the terminal-equipped electric wire according to the present embodiment, the tool 130 is provided with the relief portion 133 that suppresses interference between the tool 130 and the crimp terminal 2 in the joining step. Therefore, unwanted deformation is less likely to occur in the crimp terminal 2 in the joining process. The relief portion may be provided in the crimp terminal 2.

In the method of manufacturing the terminated electric wire according to the present embodiment, in the joining step, the cutting edge 130a is slid with respect to the distal end surface 31c of the core wire 31 by using the machining tool 130 having the cutting edge 130a, thereby shear-deforming the distal end of the bare wire 32. The shape of the cutting edge 130a is a convex shape in which the central portion in the width direction of the crimp terminal 2 protrudes more than both end portions in the width direction. Thereby, interference between the working tool 130 and the crimp terminal 2 is suppressed in the joining step.

[ 1 st modification of embodiment 1 ]

A 1 st modification of embodiment 1 will be described with reference to fig. 24 and 25. Fig. 24 is a front view for explaining a bonding step according to modification 1 of embodiment 1, and fig. 25 is a cross-sectional view for explaining the bonding step according to modification 1 of embodiment 1. The section XXV-XXV of FIG. 24 is shown in FIG. 25. The 1 st modification of the 1 st embodiment is different from the 1 st embodiment in that, for example, the terminal crimping device 100 forms the joint portion 34 in a state where the second die 120 is held at the bottom dead center.

The working tool 140 shown in fig. 24 and 25 is movable relative to the second mold 120. The terminal crimping apparatus 100 operates the 2 nd die 120 and the working tool 140 in an interlocking manner. The mechanism for operating the second mold 120 and the mechanism for operating the working tool 140 may be common or independent from each other. The terminal crimping apparatus 100 lowers the working tool 140 to form the joint 34 while stopping the second die 120 at the bottom dead center. Fig. 24 and 25 show a state in which the second mold 120 is stopped at the bottom dead center. The working tool 140 descends toward the front end 31b of the core wire 31. From this state, the terminal crimping device 100 further lowers the working tool 140, and the tip 31b is shear-deformed by the working tool 140 to form the joint 34. The shape of the cutting edge 140a of the machining tool 140 is, for example, the same as the shape of the cutting edge 130a of embodiment 1.

According to the 1 st modification of the 1 st embodiment, the joining process is started in a state where the core crimping portions 12 have been crimped with respect to the core 31. That is, the joint 34 is formed after the pressing force of the second mold 120 against the core crimping portion 12 and the core 31 becomes maximum. Thus, according to the method of manufacturing a terminal-equipped wire according to modification 1 of embodiment 1, since the external force is not easily applied to the joining portion 34 after the joining portion 34 is formed, the joining portion 34 is easily stabilized.

[ 2 nd modification of embodiment 1 ]

A 2 nd modification of embodiment 1 will be described with reference to fig. 26 and 27. Fig. 26 is a front view for explaining a bonding step according to modification 2 of embodiment 1, and fig. 27 is a cross-sectional view for explaining the bonding step according to modification 2 of embodiment 1. The section XXVII-XXVII of fig. 26 is shown in fig. 27. The modification 2 of the first embodiment is different from the modification 1 in that the terminal crimping device 100 forms the joint portion 34 while raising the second die 120, for example.

The machining tool 140 according to modification 2 of embodiment 1 is movable relative to the second mold 120, similarly to the machining tool 140 according to modification 1. The terminal crimping device 100 forms the engaging portion 34 by the working tool 140 after the second die 120 reaches the bottom dead center. In the joining step according to modification 2, the terminal crimping device 100 raises the second die 120 without stopping the second die 120 at the bottom dead center. That is, in the bonding step, as shown in fig. 26 and 27, the second mold 120 is raised and the working tool 140 is lowered.

According to the 2 nd modification of the 1 st embodiment, as in the 1 st modification described above, the joining step is started in a state where the core wire pressure-bonding section 12 is pressure-bonded to the core wire 31. This makes it easy to stabilize the formed joint portion 34. In the case where the joining step is performed after the crimping, the joining portion 34 may be formed by a device different from the terminal crimping device 100.

[ 3 rd modification of embodiment 1 ]

a modification 3 of embodiment 1 will be described with reference to fig. 28 and 29. Fig. 28 is a front view for explaining a bonding step according to modification 3 of embodiment 1, and fig. 29 is a cross-sectional view for explaining the bonding step according to modification 3 of embodiment 1. The XXIX-XXIX section of fig. 28 is shown in fig. 29. The 3 rd modification of embodiment 1 is different from embodiment 1 in that, for example, the machining tool 150 is moved in the second direction W.

The machining tool 150 according to modification 3 of embodiment 1 includes a first sliding portion 151 and a second sliding portion 152. The first sliding portion 151 and the second sliding portion 152 move in the second direction W, respectively. The terminal crimping apparatus 100 operates the 2 nd die 120 and the working tool 150 in an interlocking manner. The mechanism for operating the second mold 120 and the mechanism for operating the processing tool 150 may be common or independent from each other. The two sliding portions 151, 152 move in opposite directions to each other along the second direction W. The cutting edge 151a of the first sliding part 151 and the cutting edge 152a of the second sliding part 152 face each other in the second direction W. The machining tool 150 forms the joint 34 by sandwiching the tip 31b of the core wire 31 between the cutting edge 151a of the first sliding portion 151 and the cutting edge 152a of the second sliding portion 152. The two tips 151a, 152a have, for example, a symmetrical shape. The movement of the two cutting edges 151a and 152a is symmetrical, for example.

The machining tool 150 forms the joint 34 together with, for example, a crimping process. However, the processing tool may form the joint 34 before or after the pressure bonding step. The terminal crimping apparatus 100 may form the joint portion 34 by the working tool 150 in a state where the second die 120 is stopped at the bottom dead center.

A cross section of the core wire 31 having completed the joining process with the process tool 150 is shown in fig. 30. The cross section of fig. 30 is a cross section orthogonal to the third direction H. The distal end surface 31c of the core wire 31 has a first surface 31d and a second surface 31 e. The first surface 31d and the second surface 31e are respectively surfaces facing forward and adjacent to each other. In the present modification, the first surface 31d and the second surface 31e are adjacent to each other in the second direction W.

Both the first surface 31d and the second surface 31e are inclined surfaces inclined with respect to the first direction L. The boundary between the first surface 31d and the second surface 31e is located at the center portion in the second direction W. The first surface 31d is inclined toward the front side as approaching the second surface 31e along the second direction W. The second face 31e is inclined so as to go to the front side as approaching the first face 31d along the second direction W.

in the first surface 31d, the tips of the bare wires 32 are shear-deformed in a direction from the first surface 31d toward the second surface 31 e. The bare wires 32 on the first surface 31d are deformed by a shearing force acting from the first sliding portion 151 toward the second surface 31 e. On the other hand, the second surface 31e is shear-deformed in a direction from the second surface 31e toward the first surface 31d by the tips of the bare wires 32. The bare wires 32 on the second surface 31e are deformed by a shearing force acting from the second sliding portion 152 toward the first surface 31 d.

As described above, in the terminal-equipped wire 1 according to the modification 3 of the embodiment 1, the distal end surface 31c of the core wire 31 is an inclined surface inclined with respect to the axial direction of the wire 3. The working tool 150 easily promotes the formation of the joint 34 by shear-deforming the core wire 31 so as to form an inclined surface.

In the terminal-equipped wire 1 according to modification 3 of embodiment 1, the distal end surface 31c of the core wire 31 includes a first surface 31d and a second surface 31e adjacent to each other. In the first surface 31d, the tips of the bare wires 32 are shear-deformed in a direction from the first surface 31d toward the second surface 31 e. In the second surface 31e, the tips of the bare wires 32 are shear-deformed in a direction from the second surface 31e toward the first surface 31 d. The two surfaces 31d and 31e are formed in this manner, and the core wire 31 is normally sandwiched by the two cutting edges 151a and 152a to be shear-deformed. By sandwiching the core wire 31 by the two cutting edges 151a, 152, the joint portion 34 can be easily formed over the entire region of the distal end surface 31 c.

[ 4 th modification of embodiment 1 ]

A 4 th modification of embodiment 1 will be described with reference to fig. 31 and 32. Fig. 31 is a front view for explaining a bonding step according to a 4 th modification of embodiment 1, and fig. 32 is a cross-sectional view for explaining the bonding step according to the 4 th modification of embodiment 1. The XXXII-XXXII cross section of fig. 31 is shown in fig. 32. The 4 th modification of embodiment 1 is different from embodiment 1 in that, for example, the joint portion 34 is formed at a time for the plurality of core wires 31.

As shown in fig. 31 and 32, in the 4 th modification, the crimp terminal 2 is crimped to the electric wire 3 having the first electric wire 3A and the second electric wire 3B. The two electric wires 3A, 3B are placed on the crimp terminal 2, for example, overlapping in the third direction H. The working tool 130 plastically deforms the leading ends 31B of the two electric wires 3A, 3B, respectively, to form the joint 34. The processing tool 130 may join the core wire 31 of the first wire 3A and the core wire 31 of the second wire 3B to form the joint 34. Thereby, the core wires 31 of the two electric wires 3A, 3B are metal-joined to each other, thereby improving the electric performance of the terminal-equipped electric wire 1.

[ 5 th modification of embodiment 1 ]

A 5 th modification of embodiment 1 will be described with reference to fig. 33. Fig. 33 is a cross-sectional view for explaining a bonding step according to modification 5 of embodiment 1. The 5 th modification of embodiment 1 is different from embodiment 1 in that, for example, the cutting step is performed simultaneously with the joining step. The cutting step is a step of cutting the electric wire 3.

As shown in fig. 33, the working tool 130 according to the modification 5 cuts a part of the distal end side of the core wire 31. The processing tool 130 cuts the core wire 31 and forms a joint 34 at a portion of the core wire 31 on the sheath 33 side. The cutting edge 130a of the processing tool 130 has a shape capable of cutting the core wire 31. The core wire 31 is cut by the cutting edge 130a of the working tool 130 to form a new tip 31b on the core wire 31, and the joint 34 is formed at the tip 31b by shear-deforming the newly formed tip 31b of the inclined surface 131 of the working tool 130.

The machining tool 130 may shear the core wire 31 when the amount of protrusion of the core wire 31 in the crimping step is equal to or more than a predetermined amount. In the crimping step, the core wire crimping part 12 presses the core wire 31 to compact the core wire 31. As a result, the core wire 31 is elongated in the first direction L. A case is considered in which the distal end 31b of the core wire 31 is located at a position further forward than the working tool 130 due to a change in the elongation of the core wire 31 in the crimping step or the like. In this case, the machining tool 130 cuts the core wire 31 with the cutting edge 130 a. As a result, the length of the core wire 31 protruding from the core wire pressure-bonding section 12 is not easily made excessively large.

[ 2 nd embodiment ]

Embodiment 2 will be described with reference to fig. 34 to 50. In embodiment 2, components having the same functions as those of the components described in embodiment 1 are denoted by the same reference numerals, and redundant description thereof is omitted. Fig. 34 is a front view illustrating a cutting step and a joining step according to embodiment 2, fig. 35 is a cross-sectional view illustrating the cutting step and the joining step according to embodiment 2, fig. 36 is another cross-sectional view illustrating the cutting step and the joining step according to embodiment 2, fig. 37 is a cross-sectional view illustrating formation of a joining portion, and fig. 38 is a side view illustrating a cut electric wire. The XXXV-XXXV cross-section of FIG. 34 is shown in FIG. 35.

In embodiment 2, the cutting step is completed before the crimping step, and in the cutting step, the joint 34 is formed in the core wire 31. That is, the cutting step is performed together with the joining step. The cutting step and the joining step are performed by, for example, a cutting device 40 shown in fig. 34 and 35. The cutting device 40 has a housing portion 41 and a cutting edge 42. The accommodating portion 41 is a member that supports the electric wire 3, and is formed, for example, with metal. The accommodating portion 41 has a groove portion 43 that supports the electric wire 3. The groove 43 has a circular arc shape with a radius corresponding to the outer diameter of the wire 3.

The cutting blade 42 is a member for cutting the electric wire 3, and cuts the electric wire 3 by the cutting edge 42 a. The shape of the cutting edge 42a in a front view is, for example, a curved shape in which both end portions in the width direction protrude more than the central portion in the width direction, as shown in fig. 34. The curved portion of the cutting edge 42 in the front view has an arc shape, for example. The cutting edge 42a has a cross-sectional shape in which one surface in the thickness direction is formed as an inclined surface 44, as shown in fig. 35, for example. The electric wire 3 is placed in the accommodating portion 41 in a state where the end portion 31a of the core wire 31 is exposed, for example. The cutting blade 42 cuts the core wire 31 of the electric wire 3 while relatively moving toward the accommodating portion 41.

The inclined surface 44 of the cutting blade 42 is formed on the cover 33 side. Therefore, as shown in fig. 36, the cutting edge 42a of the cutting blade 42 shears and deforms the tip 31b of the core wire 31 by the inclined surface 44 while cutting the core wire 31. As shown in fig. 37, the inclined surface 44 slides with respect to the distal end surface 31c of the core wire 31, and the distal end of each bare wire 32 is shear-deformed in the moving direction of the cutting edge 42 a. As a result, the joint portion 34 where the adjacent bare wires 32 are joined is formed at the tip of the bare wire 32.

Fig. 38 shows the cut electric wire 3. In the cut electric wire 3, the tip of the bare wire 32 is shear-deformed in a common direction to form a joint 34. In embodiment 2, in the setting step, the wire 3 formed with the engaging portion 34 is set to the crimp terminal 2. As shown in fig. 39, in the setting step, the electric wire 3 is set in the crimp terminal 2 so that the tip 31b of the core 31 is positioned on the front side of the core crimping part 12. The electric wire 3 is preferably provided in such a manner that at least the joint portion 34 is located on the front side of the core crimping portion 12.

In the crimping step, the terminal crimping apparatus 100 crimps the core wire crimping section 12 against the core wire 31 and crimps the sheath crimping section 14 against the sheath 33. The first crimper 121 crimps the core wire crimping part 12 with respect to the core wire 31 in a state where the joint part 34 protrudes from the core wire crimping part 12. As shown in fig. 40, in the terminal-equipped electric wire 1 after crimping, the joint 34 protrudes forward from the core crimping section 12. The bare wires 32 are electrically connected to each other via the joint 34, thereby achieving an improvement in the electrical performance of the terminal-equipped electric wire 1.

The shape of the cutting device 40 is not limited to the shape of the above example. Fig. 41 is a front view showing an example of the shape of the cutting device. In the accommodating portion 41 shown in fig. 41, a supporting surface 41a supporting the electric wire 3 is flat. The cutting edge 42a of the cutting blade 42 has a straight shape when viewed from the front.

fig. 42 is a front view showing another example of the shape of the cutting device. In the accommodating portion 41 shown in fig. 42, the groove portion 45 has a shape different from that of the groove portion 43 shown in fig. 34. In the groove portion 45, the shape of the central portion in the width direction is substantially circular arc shape, and both end portions are linear shape. In the cutting blade 42, the shape of the cutting edge 42a in a front view is a substantially arc shape at the center in the width direction, and is linear at both ends.

Fig. 43 shows an example of a cross-sectional shape of the cutting blade. In the cutting edge 42 shown in fig. 43, the inclined surface 46 is provided on the front side in the first direction L. That is, the inclined surface 46 of the cutting edge 42a is inclined so as to approach the coating 33 as going to the front end. Fig. 44 is a sectional view showing another example of the sectional shape of the cutting blade. In the cutting edge 42 shown in fig. 44, the cutting edge 42a has inclined surfaces 47a and 47b on both sides. The cutting edge 42a has a cross-sectional shape in which the central portion in the thickness direction protrudes beyond both end portions. The cross-sectional shape of the cutting blade 42 may be the cross-sectional shape shown in fig. 21.

The cutting device 40 may cut the core wire in an oblique direction. Fig. 45 shows a cutting device 40 for cutting the core wire 31 in an oblique direction. The cutting device 40 of fig. 45 has a receiving portion 41 and a cutting edge 48. The moving direction of the cutting blade 48 is a direction inclined with respect to the axial direction of the electric wire 3. The cutting blade 48 cuts the core wire 31 while shear-deforming the tip of the core wire 31.

As shown in fig. 46, the joint 34 is formed in the core wire 31 shear-deformed by the cutting blade 48. The front end surface 31c of the core wire 31 is inclined with respect to the axial direction of the electric wire 3. As shown in fig. 47, the leading end of the bare wire 32 is plastically deformed in the moving direction Y4 of the cutting blade 48. As a result, the adjacent bare wires 32 are joined to each other to form a joint 34. When the core wire 31 is cut in an oblique direction, it is considered that a tensile force is likely to act on the bare wire 32 in the axial direction. This is expected to facilitate formation of the joint 34.

The cutting device 40 may form the core wire 31 by using two cutting blades. Fig. 48 shows a cutting device 40 for cutting the core wire 31 by two cutting blades. The cutting device 40 shown in fig. 48 has two cutting edges 49 instead of the accommodating portion 41. The cutting blade 49 is disposed such that the cutting edge 49a faces the cutting edge 42a of the cutting blade 42. In the cutting device 40 shown in fig. 48, the cutting blade 42 and the cutting blade 49 have inclined surfaces 44 and 50 on the same side. The cutting device 40 moves the two cutting blades 42, 49 in opposite directions to each other. The cutting device 40 holds the electric wire 3 between the two cutting blades 42 and 49 by a holding portion, not shown.

The cutting device 40 moves the two cutting blades 42 and 49 in a direction to approach each other, and cuts the core wire 31 while sandwiching it between the cutting edges 42a and 49 a. As shown in fig. 49, the distal end surface 31c of the cut core wire 31 has a first surface 31f and a second surface 31g adjacent to each other. Both the first surface 31f and the second surface 31g are inclined surfaces inclined with respect to the axial direction of the electric wire 3. The boundary between the first surface 31f and the second surface 31g is formed substantially at the center of the core wire 31. The first surface 31g is inclined so as to protrude most from the boundary with the second surface 31 g. The second surface 31f is inclined so as to protrude most from the boundary with the first surface 31 g.

In the first surface 31f, the tips of the bare wires 32 are shear-deformed in a direction from the first surface 31f toward the second surface 31 g. In the second surface 31g, the tips of the bare wires 32 are shear-deformed in a direction from the second surface 31g toward the first surface 31 f. As shown in fig. 50, the bare wires 32 are provided with joint portions 34 that are joined to the adjacent bare wires 32 on the first surface 31f and the second surface 31 g.

[ 1 st modification of embodiment 2 ]

a 1 st modification of embodiment 2 will be described with reference to fig. 51 to 57. Fig. 51 is a front view illustrating a crimping step according to a 1 st modification of embodiment 2, fig. 52 is a cross-sectional view illustrating the crimping step according to the 1 st modification of embodiment 2, fig. 53 is a front view of a terminal-equipped electric wire according to the 1 st modification of embodiment 2, fig. 54 is a side view of the terminal-equipped electric wire according to the 1 st modification of embodiment 2, and fig. 55 is a cross-sectional view of the terminal-equipped electric wire according to the 1 st modification of embodiment 2. The LV-LV cross-section of figure 53 is shown in figure 55.

the 1 st modification of the 2 nd embodiment is different from the 2 nd embodiment in that, for example, the crimp terminal 2 has the covering portion 20. As shown in fig. 51 and 52, a crimp terminal 2 according to a 1 st modification of embodiment 2 includes a covering portion 20. The covering section 20 is configured to cover the front end 31b of the core wire 31. The covering portion 20 includes a first covering sheet 21A, a second covering sheet 21B, and a bottom portion 22. The covering portion 20 is disposed between the core wire crimping portion 12 and the coupling portion 11. One end of the bottom portion 22 in the first direction L is connected to the bottom portion 15 of the core wire crimping portion 12, and the other end is connected to the coupling portion 11.

the first cover sheet 21A and the second cover sheet 21B are disposed apart from the pressure-holding sheets 16A and 16B. The first covering sheet 21A extends from one end of the bottom portion 22 in the second direction W, and the second covering sheet 21B extends from the other end of the bottom portion 22 in the second direction W. The covering portion 20 is formed such that the first covering sheet 21A, the second covering sheet 21B, and the bottom portion 22 form a U shape. The first covering sheet 21A is disposed on the same side as the first pressing sheet 16A in the second direction W. The second covering sheet 21B is disposed on the same side as the second pressing sheet 16B in the second direction W.

As shown in fig. 52, the terminal crimping device 100 has a fourth anvil 114 that supports the covering portion 20 and a third crimper 123 that deforms the covering portion 20. The fourth anvil 114 is arranged between the first anvil 111 and the third anvil 113. The third presser 124 is disposed on the front side with respect to the first presser 121, and is opposed to the fourth anvil 114 in the third direction H.

As shown in fig. 52, the electric wire 3 is provided to the crimp terminal 2 in such a manner that the front end 31b of the core wire 31 is located at the covering portion 20. More specifically, the wire 3 is disposed so that the tip end is positioned between the first cover sheet 21A and the second cover sheet 21B. In the pressure bonding step, the third pressure bonding tool 123 deforms the first cover sheet 21A and the second cover sheet 21B. The third pressure bonding tool 123 deforms the two cover sheets 21A and 21B so that the bottom portion 22, the first cover sheet 21A, and the second cover sheet 21B are formed into a ring shape, for example, as shown in fig. 53. In the covering portion 20 shown in fig. 53, the front end portion of the first covering portion 21A is in contact with the front end portion of the second covering portion 21B, and the covering portions 21A and 21B are formed in an arc shape. The first cover sheet 21A and the second cover sheet 21B cover the leading ends 31B of the core wires 21 from the outer peripheral sides, thereby protecting the leading ends 31B.

the two covering sheets 21A and 21B may cover the distal end 31B without applying a pressing force to the distal end 31B, for example. Alternatively, the two covering sheets 21A and 21B may cover the distal end 31B while pressing the distal end 31B against the bottom portion 22. The pressing force at this time is preferably of such a magnitude as not to collapse the joint portion 34 of the tip 31b, in other words, of such a magnitude as not to keep the bare wires 32 joined apart.

Fig. 56 shows an example of the shape of the covering portion 20. The two cover sheets 21A and 21B may be deformed so that the tip ends thereof are inclined downward in the pressure bonding step. In the covering part 20 shown in fig. 56, the front end portions of the two covering sheets 21A, 21B are bent so as to approach the bottom part 22 as going to the front end. The two cover sheets 21A and 21B may press the core wire 31 against the bottom portion 22 by their respective leading ends.

Fig. 57 shows another example of the shape of the covering portion 20. The two cover sheets 21A, 21B may cover the front end 31B without overlapping. In the covering portion 20 shown in fig. 57, the first covering sheet 21A is overlapped outside the second covering sheet 21B. The second covering sheet 21B may also press the core wire 31 toward the bottom portion 22.

as described above, in the method of manufacturing a terminal-equipped wire according to modification 1 of embodiment 2, the tip 31b of the core wire 31 is covered from the outer peripheral side by the covering portion 20 included in the crimp terminal 2 in the crimping step. The covering section 20 protects the front end 31b of the core wire 31 from contact with other components and prevents an external force from acting on the joint section 34. Thus, the method of manufacturing the terminal-equipped wire according to the present modification can protect the joint 34 and improve the electrical performance of the wire 1.

The terminal-equipped wire 1 according to modification 1 of embodiment 2 includes the covering portion 20 covering the front end 31b of the core wire 31 from the outer peripheral side. This improves the electrical performance of the terminal-equipped electric wire 1 according to the present modification.

[ 2 nd modification of embodiment 2 ]

A 2 nd modification of embodiment 2 will be described with reference to fig. 58 to 62. Fig. 58 is a front view showing a crimp terminal according to a 2 nd modification of embodiment 2, fig. 59 is a side view showing the crimp terminal according to the 2 nd modification of embodiment 2, fig. 60 is a front view showing a terminal-equipped electric wire according to the 2 nd modification of embodiment 2, fig. 61 is a side view showing the terminal-equipped electric wire according to the 2 nd modification of embodiment 2, and fig. 62 is a cross-sectional view showing the terminal-equipped electric wire according to the 2 nd modification of embodiment 2.

In the crimp terminal 2 shown in fig. 58, the covering portion 23 is formed integrally with the core wire crimping portion 12. The covering portion 23 has a first covering sheet 25A, a second covering sheet 25B, and a bottom portion 24. The bottom portion 24 is connected to the front end of the bottom portion 15 of the core crimping portion 12. The first covering sheet 21A extends from one end of the bottom portion 24 in the second direction W, and the second covering sheet 25B extends from the other end of the bottom portion 24 in the second direction W. The first covering sheet 25A is connected to the front end of the first pressing piece 16A of the core wire crimping part 12. The second covering sheet 25B is connected to the front end of the second pressing sheet 16B of the core wire crimping part 12. The covering portion 23 is formed such that the first covering sheet 25A, the second covering sheet 25B, and the bottom portion 24 form a U shape.

The crimp terminal is crimped with respect to the electric wire 3 by, for example, the terminal crimping apparatus 100 (refer to fig. 52) having the third crimper 123. The third crimper 123 deforms the two covering sheets 25A, 25B as shown in fig. 60, for example. In the covering portion 23 shown in fig. 60, the front end of the first covering sheet 25A abuts against the front end of the second covering sheet 25B, and the covering sheets 25A and 25B are shaped like circular arcs. The first cover sheet 25A and the second cover sheet 25B cover the leading ends 31B of the core wires 31 from the outer peripheral sides, thereby protecting the leading ends 31B. The core wire crimping part 12 is crimped to the core wire 31, for example, in a so-called B-crimp manner.

The covering portion 23 may cover the front end 31b of the core wire 31 without applying a pressing force to the front end 31b, or may press the front end 31b with a force to such an extent that the bare wires 32 joined to each other are not separated from each other.

[ 3 rd modification of the 2 nd embodiment ]

A modification 3 of embodiment 2 will be described with reference to fig. 63 to 76. Fig. 63 is a cross-sectional view for explaining a cutting step according to modification 3 of embodiment 2, fig. 64 is another cross-sectional view for explaining the cutting step according to modification 3 of embodiment 2, fig. 65 is a cross-sectional view for an electric wire on which a joint is formed, and fig. 66 is a cross-sectional view for explaining a removal step according to modification 3 of embodiment 2.

The modification 3 of embodiment 2 is different from embodiment 2 in that, for example, the removing step is performed after the cutting step and the joining step are completed. As shown in fig. 63 and 64, in the method for manufacturing a terminated electric wire according to modification 3 of embodiment 2, the core wire 31 is cut at a position covered with the sheath 33.

As shown in fig. 63, the cutting device 40 is provided in the electric wire 3 so that the portion of the core wire 31 covered with the sheath 33 faces the cutting blade 42. As shown in fig. 64, the cutting blade 42 cuts the sheath 33 and the core wire 31, thereby cutting the distal end portion of the electric wire 3. At this time, the cutting blade 42 shear-deforms the tip of the core wire 31 to form the joint 34. As shown in fig. 65, a joint portion 34 formed by joining adjacent bare wires 32 is formed at the tip of the bare wire 32. As described above, in modification 3 of embodiment 2, the cutting step and the joining step are performed simultaneously on the core wire covered with the sheath 33.

When the cutting step and the joining step are completed, the tip 33a of the cover 33 is removed as shown in fig. 66. After the removal step, the crimp terminal 2 is crimped to the wire 3 by a crimping step, thereby completing the terminal-equipped wire 1.

As described with reference to fig. 67 to 69, the joint portion 34 may be formed for each of the two electric wires 3C and 3D formed by cutting. As shown in fig. 68 and 69, the cutting device 40 cuts one electric wire 3 and divides the electric wire into two electric wires 3C and 3D. The cutting device 40 cuts the electric wire 3 by the two cutting blades 42 and 49. The cutting blades 42 and 49 cut the portion of the core wire 31 covered with the sheath 33. The cutting edges 42 and 49 have, for example, inclined surfaces on both surfaces of the cutting edges 42a and 49 a. The two cutting blades 42, 49 shear-deform the tip of the core wire 31 while cutting the core wire 31. As a result, as shown in fig. 70, the joint 34 is formed at the tip of the bare wire 32 in the core 31C of the wire 3C, and the joint 34 is formed at the tip of the bare wire 32 in the core 31D of the wire 3D.

When the cutting step and the joining step are completed, as shown in fig. 71, the distal end portion 33a is removed from the sheath 33C of the electric wire 3C, and the distal end portion 33a is removed from the sheath 33D of the electric wire 3D. The joint 34 can be formed simultaneously for the two electric wires 3C, 3D, thereby achieving a reduction in manufacturing time.

As described with reference to fig. 72 to 74, one electric wire 3 may be divided into two electric wires 3E and 3F by one cutting blade 42. In the cutting device 40 shown in fig. 73, the accommodating portion 41 includes a first accommodating portion 41A and a second accommodating portion 41B. The first accommodating portion 41A and the second accommodating portion 41B are disposed to be spaced apart so that the cutting edge 42 can enter therebetween. The cutting blade 42 is disposed opposite to the gap between the first accommodating portion 41A and the second accommodating portion 41B. The electric wire 3 is supported by the first accommodating portion 41A and the second accommodating portion 41B.

As shown in fig. 74, the cutting blade 42 cuts the sheath 33 and the core wire 31 to divide one electric wire 3 into two electric wires 3E and 3F. The cutting blade 42 cuts the core wire 31 and makes the tip of the core wire 31 shear-deform. As a result, as shown in fig. 75, the joint 34 is formed at the tip of the bare wire 32 in the core 31E of the wire 3E, and the joint 34 is formed at the tip of the bare wire 32 in the core 31F of the wire 3F.

When the cutting step and the joining step are completed, as shown in fig. 76, the distal end portion 33a is removed from the sheath 33E of the electric wire 3E, and the distal end portion 33a is removed from the sheath 33F of the electric wire 3F.

[ other modifications ]

Other modifications will be described. In the joining step, the temperature of the working tools 130, 140, 150 and the cutting blades 42, 48, 49 may be increased to soften the core wire 31. For example, the terminal crimping device 100 may include a heater for heating the processing tools 130, 140, and 150. By pressing the high-temperature processing tools 130, 140, and 150 against the core wires 31, the deformation of the core wires 31 is promoted, and the bare wires 32 can be efficiently joined to each other. The cutting device 40 may have a heater for heating the cutting blades 42, 48, 49.

In the joining step, the core wire 31 may be deformed while the processing tools 130, 140, 150 and the cutting blades 42, 48, 49 are ultrasonically vibrated. The bare wires 32 can be made to slide more strongly and more largely with each other by the ultrasonic vibration.

The method of pressing the core wire 31 by the pressing pieces 16A and 16B is not limited to the so-called B-crimp method. The pressing pieces 16A and 16B may be wound around the joint 34, for example, by overlapping the second pressing piece 16B on the first pressing piece 16A. When the pressing pieces 16A and 16B are pressed in a superposed manner, the pressing pieces 16A and 16B may be configured to integrally cover both the core wire 31 and the sheath 33.

The method of pressing the sheath pressing section 14 against the sheath 33 is not limited to the so-called B-press bonding. The pressing pieces 17A, 17B may also be crimped in an overlapping manner, for example. The crimp terminal may not have the sheath crimping portion 14.

The disclosure of the above embodiments and modifications can be combined as appropriate.