Press mold, method for manufacturing terminal-attached electric wire, and terminal-attached electric wire

Abstract

In a molding die including a lower die and an upper die for crimping a crimping forming portion of a crimping terminal to an electric wire, a conductor size of a core wire of the electric wire to which the crimping forming portion is crimped is in a range of 40 sq or more and 95 sq or less, and a diameter of a plurality of single wires constituting the core wire is 0.20 mm or more and 0.80 mm or less, the indentation length, which is designated as the length in the longitudinal direction of the end surface of the lower mold central convex portion of the lower mold indentation portion, is 6.5 mm or more.

Description

Technical Field

[0001] The present invention relates to a molding die, a method for manufacturing a terminal-attached electric wire, and the terminal-attached electric wire. Background Art

[0002] Conventionally, there is a terminal crimping device for producing a terminal-attached electric wire by crimping a crimping forming portion of a crimping terminal onto the end of the electric wire. Typically, a crimping die comprising a lower die and an upper die is used in a terminal crimping device. The lower die and the upper die are held so that they can move vertically toward and away from each other. When they approach each other, the crimping forming portion is plastically deformed to form the crimped portion.

[0003] JP 2022-42683A discloses a technology related to a press mold, which includes a lower mold and an upper mold, each of which has a protruding indentation portion that contacts a crimping forming portion, a concave portion on one side of the width direction of the indentation portion, and a convex portion on the other side of the width direction of the indentation portion. Here, the width direction is a direction perpendicular to the longitudinal direction aligned with the axial direction of the crimping forming portion. When the lower mold and the upper mold of the press mold approach each other with the crimping forming portion placed on the indentation portion of the lower mold, the convex portion of the lower mold engages with the concave portion of the upper mold, and the convex portion of the upper mold engages with the concave portion of the lower mold. Then, the indentation portion of the lower mold and the indentation portion of the upper mold form a crimping portion by pressing the crimping forming portion while being held between the convex portions at both ends in the width direction. Therefore, the convex portion limits the plastic deformation of the crimping forming portion due to expansion in the width direction, thereby preventing the crimping terminal from being fitted into the press mold and preventing burrs from appearing in the crimping portion. Summary of the Invention

[0004] Since the conditions regarding the shape of the swaging die disclosed in JP 2022-42683A are actually unknown, a specific proposal is desired in order to improve the electrical performance of the terminal-attached electric wire manufactured using the swaging die.

[0005] An object of the present invention is to provide a swaging die for improving the electrical properties of a terminal-fitted electric wire, a method for manufacturing a terminal-fitted electric wire having improved electrical properties, or a terminal-fitted electric wire.

[0006] One embodiment of the present invention is a press mold, which includes a lower mold and an upper mold, wherein the lower mold and the upper mold are used to crimp the crimping forming part of the crimping terminal to the electric wire when the lower mold and the upper mold are close to each other in the vertical direction, wherein the lower mold and the upper mold both have the shape of a rectangular parallelepiped, the cross-section on the horizontal plane of the rectangular parallelepiped is defined in the length direction aligned with the axial direction of the crimping forming part and in the width direction perpendicular to the length direction, and the lower mold and the upper mold each include: an indentation portion, which is arranged in a concave portion and has a central convex portion protruding in the crimping direction, the concave portion is formed on the mold surface oriented in the crimping direction, and along the length direction a concave portion adjacent to one end of the indentation in the width direction and extending from the mold surface in a direction opposite to the crimping direction; a convex portion adjacent to the other end of the indentation in the width direction and protruding from the mold surface in the crimping direction, and when the conductor size of the core wire of the electric wire crimped by the crimping forming portion is within the range of 40sq to 95sq, and the diameter of the multiple single wires constituting the core wire is 0.20mm to 0.80mm, the indentation length specified as the length in the length direction of the end surface of the central convex portion of the indentation is 6.5mm or more.

[0007] Furthermore, according to one aspect of the present invention, a method for manufacturing a terminal-attached electric wire in which a crimping forming portion of a crimping terminal is crimped to the electric wire comprises: inserting a portion of the electric wire into the crimping forming portion; and crimping the electric wire to the crimping forming portion by holding the crimping forming portion with a press die including a lower die and an upper die, the press die being the press die according to the aforementioned aspect.

[0008] In addition, according to one embodiment of the present invention, an electric wire to which a terminal is attached includes a crimping portion formed by holding a crimping forming portion using a pressing die including a lower die and an upper die, a portion of the electric wire being inserted into the crimping forming portion, wherein the crimping portion has a lower crimping recess and an upper crimping recess, a convex shape of a portion of the lower die is transferred to the lower crimping recess, and a convex shape of a portion of the upper die is transferred to the upper crimping recess, and when the conductor size of the core wire of the electric wire crimped by the crimping forming portion is within the range of 40 sq or more and 95 sq or less, and the wire diameter of the plurality of single wires constituting the core wire is 0.20 mm or more and 0.80 mm or less, the recess length is 6.5 mm or more, which is defined as the length of the bottom surfaces of the lower crimping recess and the upper crimping recess in the longitudinal direction aligned with the axial direction of the crimping forming portion.

[0009] According to the present invention, it is possible to provide a swaging die that improves the electrical properties of a terminal-fitted electric wire, a method for manufacturing a terminal-fitted electric wire having improved electrical properties, or a terminal-fitted electric wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 FIG. 1 is a perspective view of a terminal crimping device to which a swaging die according to an embodiment can be applied.

[0011] Figure 2 is a perspective view of a terminal-attached electric wire manufactured using a swaging die according to one embodiment.

[0012] Figure 3 It is a perspective view showing an electric wire and a crimping terminal before being mounted on a terminal crimping device.

[0013] Figure 4 is a perspective view of a coining die according to one embodiment.

[0014] Figure 5 is a perspective view of a lower mold constituting a swaging mold according to one embodiment.

[0015] Figure 6 is a partial cross-sectional view showing a state of the lower mold and the upper mold before they approach each other.

[0016] Figure 7 It is a partial cross-sectional view showing the state of the lower mold and the upper mold during crimping.

[0017] Figure 8 It is a partial cross-sectional view showing a state where the lower mold and the upper mold are separated.

[0018] Figure 9 corresponds to Figure 5 Partial cross-sectional view of the lower mold at section IX-IX.

[0019] Figure 10 is with Figure 2 The XX section corresponds to a partial cross-sectional view of the electric wire with the terminal attached.

[0020] Figure 11 The crimping part is Figure 10 Cross-sectional view at the position corresponding to the measurement section C in .

[0021] Figure 12 is a graph showing the electrical properties of Example 1 of the terminal-attached electric wire.

[0022] Figure 13 is a graph showing the electrical properties of Example 2 of the terminal-attached electric wire.

[0023] Figure 14 is a graph showing the electrical properties of Example 3 of the terminal-attached electric wires.

[0024] Figure 15 is a graph showing the electrical properties of Example 1 of the terminal-attached electric wire.

[0025] Figure 16 is a graph showing the electrical properties of Example 2 of the terminal-attached electric wire.

[0026] Figure 17 is a graph showing the electrical properties of Example 3 of the terminal-attached electric wires. DETAILED DESCRIPTION

[0027] Hereinafter, a swaging die, a method for manufacturing a terminal-attached electric wire, and a terminal-attached electric wire according to an embodiment will be described in detail with reference to the accompanying drawings. For convenience of explanation, the dimensional ratios in the drawings are exaggerated and may differ from the actual ratios.

[0028] Figure 1 is a perspective view of a terminal crimping device 1 that can employ a die pressing mold 10 according to one embodiment. Hereinafter, as an example, the directions of the terminal crimping device 1 and the die pressing mold 10 will be defined as follows: the X direction represents the length direction from the rear side to the front side of the crimping terminal 110, which is axially aligned with the crimping terminal 110 mounted on the die pressing mold 10; the Y direction represents the width direction perpendicular to the X direction on a horizontal plane; and the Z direction represents the vertical direction from the bottom side to the top side. The terms "front" and "rear" may be used for the X direction. Additionally, the terms "upper" and "lower" may be used for the Z direction.

[0029] Figure 2 is a perspective view of a terminal-attached electric wire 100 according to one embodiment manufactured using a swaging die 10 . Figure 3 1 is a perspective view showing the electric wire 101 and the crimping terminal 110 before being mounted on the terminal crimping device 1 .

[0030] The terminal crimping device 1 manufactures the terminal-attached electric wire 100 by crimping the crimping forming portion 112 of the crimping terminal 110 to the end portion of the electric wire 101 to form the crimping portion 114 .

[0031] The electric wire 101 may be a high-voltage electric wire used in a high-voltage circuit of an electric vehicle or the like. The electric wire 101 has a core wire 102 and a sheath 103 covering the core wire 102. The core wire 102 is, for example, a stranded wire including a plurality of single wires made of soft copper. In the following corresponding drawings, for convenience, the core wire 102 is shown as a cross section of one conductor. The sheath 103 is an insulating member including a synthetic resin such as polyethylene. Figure 3As shown, before the electric wire 101 is mounted on the terminal crimping device 1 , the coating portion 103 is stripped off at the end portion of the electric wire 101 , and a portion of the core wire 102 is exposed to the outside.

[0032] As mentioned above, the crimping terminal 110 is a metal terminal that is crimped to the end of the electric wire 101. Specifically, it is crimped to the exposed core wire 102 with the cover 103 removed. The crimping terminal 110 can be made of, for example, pure copper with a copper content of 99.90% or greater, and may be further silver-plated. The pure copper may be oxygen-free copper, tough pitch copper, phosphorus-deoxidized copper, or the like. The crimping terminal 110 is generally rod-shaped and has a connecting portion 111, a crimping forming portion 112, and a flange 113.

[0033] As an example, the connection portion 111 is a cylindrical portion located on the front side of the crimping terminal 110 in the X direction along the axial direction of the crimping terminal 110. The connection portion 111 is connected to the opposing connection portion of the opposing terminal so that the crimping terminal 110 is electrically connected to the opposing terminal.

[0034] The crimping forming portion 112 is a cylindrical portion located behind the flange 113 in the X direction of the crimping terminal 110. The crimping forming portion 112 has an insertion hole 112a extending in the axial direction of the crimping forming portion 112, and the end of the core wire 102 can be inserted into the insertion hole 112a. In other words, the crimping terminal 110 used in this embodiment is a closed barrel type.

[0035] The flange 113 is a cylindrical portion located between the connection portion 111 and the crimping formed portion 112 and protrudes radially outward from the outer periphery of the crimping formed portion 112. An annular groove 113a to which a sealing member can be freely attached may be formed on the outer periphery of the flange 113.

[0036] The terminal crimping device 1 includes a base 11, a wire holder 12, a frame 13, a lower die 14, a movement adjustment member 15, an upper die 16, and a driving tool (not shown). The lower die 14 and the upper die 16 constitute a swaging die 10 according to the present embodiment.

[0037] The base 11 is a block-shaped structure such as a rectangular parallelepiped, and is fixed on a workbench where the terminal crimping device 1 is placed.

[0038] The wire holder 12 includes a first holder 12a, which is fixed to the base 11 and on which the wire 101 is placed; and a second holder 12b, which is configured to be able to approach and separate from the first holder 12a in the Z direction and is capable of holding the wire 101 placed on the first holder 12a. The first holder 12a has a groove 12c located in the center in the Y direction and extending in the X direction. The wire 101 is arranged in the groove 12c, so that the first holder 12a restricts movement of the wire 101 in the Y direction. With the second holder 12b separated from the first holder 12a in the Z direction, the wire holder 12 first places the wire 101 on the first holder 12a. Thereafter, the wire holder 12 moves the second holder 12b closer to the first holder 12a in the Z direction, ultimately holding the wire 101 between the first and second holders 12a, 12b. When the electric wire 101 is held between the first holding member 12 a and the second holding member 12 b , movement of the electric wire 101 in the X, Y, or Z direction is restricted.

[0039] The frame 13 is fixed to the base 11 and has a frame main body 13 a and a frame support 13 b that supports the upper mold 16 movably in the Z direction relative to the frame main body 13 a .

[0040] Figure 4 It is a perspective view of the embossing die 10 at an angle at which the front side of the embossing die 10 in the X direction can be visually recognized. Figure 4 The swaging die 10 is shown in a state where the crimping formed portion 112 of the crimping terminal 110 is placed on the lower die 14 and the crimping formed portion 112 is not yet held between the lower die 14 and the upper die 16 . Figure 5 It is a perspective view of the lower mold 14 at an angle at which the front side of the lower mold 14 in the X direction can be visually recognized.

[0041] The lower die 14 of the embossing die 10 is supported by the base 11 and, together with the upper die 16, forms a pair of dies for holding and pressing the press-bonded portion 112. The lower die 14 can be referred to as an "anvil." The lower die 14 includes a lower die body 20 and a lower die concave portion 21.

[0042] The lower mold body 20 is a rectangular parallelepiped block, and its horizontal cross section is defined in the X direction and the Y direction. The lower mold body 20 has a lower mold surface 20a. The lower mold surface 20a is the mold surface of the lower mold 14, which faces the upper mold 16 and is close to the upper mold surface 30a (see FIG. 2 ) when the lower mold 14 and the upper mold 16 are combined. Figure 6 ).

[0043] The lower mold concave portion 21 is located at the center of the lower mold surface 20a of the lower mold body 20 in the Y direction and is formed as a groove in the X direction. The lower mold concave portion 21 has a lower mold bottom surface 21a whose width in the Y direction is set to be smaller than the width of the opening in the Y direction of the opening surface opening in the lower mold surface 20a. Furthermore, the lower mold concave portion 21 has a first inclined side surface 21b and a second inclined side surface 21c formed symmetrically in the Y direction, originating from the lower mold bottom surface 21a. One end of the first inclined side surface 21b is continuous with one end edge of the lower mold bottom surface 21a extending in the X direction, and the other end of the first inclined side surface 21b is continuous with the lower mold surface 20a. Similarly, one end of the second inclined side surface 21c is continuous with the other end edge of the lower mold bottom surface 21a extending in the X direction, and the other end of the second inclined side surface 21c is continuous with the lower mold surface 20a. As moving from the lower mold bottom surface 21a to the lower mold surface 20a, the first inclined side surface 21b and the second inclined side surface 21c are inclined to be away from the lower mold bottom surface 21a in the Y direction. The lower mold concave portion 21 has a lower mold indentation 22, which is an indentation provided on the lower mold 14.

[0044] The crimping forming portion 112 is placed on the lower mold indentation 22 located on the bottom surface 21a of the lower mold. The lower mold indentation 22 crimps the crimping forming portion 112 located at the end of the electric wire 101, thereby transferring the shape of the lower mold indentation 22 to the crimping portion 114 to form the lower crimping portion 114a of the crimping portion 114 (see FIG. Figure 7 and Figure 8 ). The lower mold indentation portion 22 includes a lower mold central convex portion 22a and a pair of lower mold indentation bottom surfaces 22b. The lower mold central convex portion 22a protruding in the crimping direction is lower than the lower mold surface 20a in the Z direction and is located in the center of the lower mold body 20 in the Y direction. Here, the crimping direction relative to the lower mold 14 is the direction from the lower side to the upper side in the Z direction. The lower mold indentation bottom surfaces 22b are located on both sides of the lower mold central convex portion 22a in the Y direction and are formed below the lower mold central convex portion 22a in the Z direction. One lower mold indentation bottom surface 22b is continuous with the first inclined side surface 21b. The other lower mold indentation bottom surface 22b is continuous with the second inclined side surface 21c.

[0045] Hereinafter, the width of the lower mold central convex portion 22a in the Y direction is defined as an indentation width W. The height from the lower mold indentation bottom surface 22b to the distal end surface 22c of the lower mold central convex portion 22a in the Z direction is defined as an indentation height H.

[0046] The lower mold 14 includes a lower mold concave portion 23 and a lower mold convex portion 24. The lower mold concave portion 23 and the lower mold convex portion 24 are adjacent to each other in the Y direction with the lower mold concave portion 21 including the lower mold indentation portion 22 interposed therebetween.

[0047] The lower mold concave portion 23 is formed adjacent to one end of the lower mold indentation portion 22 across the first inclined side surface 21b in the Y direction and is formed downward from the lower mold surface 20a in the Z direction. The lower mold concave portion 23 has a bottom surface 23a (see FIG. Figure 6 ), and further having a first inner surface 23b and a second inner surface 23c facing each other in the Y direction (see Figure 6 ) and the third inner surface 23d ( Figure 6 Here, among the plurality of inner surfaces forming the lower mold concave portion 23, the first inner surface 23b is closest to the lower mold indentation portion 22.

[0048] The lower mold protrusion 24 is adjacent to the other end of the lower mold indentation 22 across the second inclined side surface 21c in the Y direction, and protrudes upward from the lower mold surface 20a in the Z direction. Note that the lower mold protrusion 24 can be regarded as a wall standing upright on the right side of the lower mold indentation 22, and can therefore be called a "horizontal wall" or "pillar". The lower mold protrusion 24 has an end surface 24a, and also has a first outer surface 24b and a second outer surface 24c facing each other in the Y direction (see Figure 6 ) and a third outer surface 24d and a fourth outer surface 24e facing each other in the X direction. Here, among the plurality of outer surfaces forming the lower mold protrusion 24, the first outer surface 24b is closest to the lower mold indentation portion 22.

[0049] like Figure 1 As shown, the movement regulating member 15 is located on the front side of the lower mold 14 in the X direction. The movement regulating member 15 has a regulating member body 15a and a pair of flange receiving portions 15b.

[0050] The adjusting member body 15a is, for example, a rectangular block. A pair of flange receiving portions 15b protrude upward from the upper surface of the adjusting member body 15a and are spaced apart in the Y direction. When the connecting portion 111 of the crimping terminal 110 is inserted between one flange receiving portion 15b and the other flange receiving portion 15b, the movement of the crimping terminal 100 in the Y direction is restricted. When the crimping forming portion 112 is arranged on the lower mold indentation portion 22, the movement of the crimping terminal 110 toward the front side in the X direction is restricted by making the flange 113 of the crimping forming portion 112 contact the pair of flange receiving portions 15b in the X direction.

[0051] The upper mold 16 of the molding die 10 is supported by the frame 13. The upper mold 16 can be called a "crimp". The upper mold 16 is supported by the frame support 13b and faces the lower mold 14 in the Z direction. In addition, the upper mold 16 is moved close to the lower mold 14 or separated from the lower mold 14 by moving the frame support 13b relative to the frame body 13a in the Z direction. Here, the crimping direction relative to the upper mold 16 is the direction from the upper side to the lower side in the Z direction. The upper mold 16 has a shape obtained by rotating the lower mold 14 180° while maintaining an orientation parallel to the YZ plane. In other words, the shape of the upper mold 16 is basically the same as that of the lower mold 14. However, there may be differences between the lower mold 14 and the upper mold 16 in aspects such as the length in the Z direction.

[0052] The upper mold 16 has an upper mold body 30 and an upper mold concave portion 31. The end of the upper mold body 30 has the same shape as the lower mold body 20, and the length of the upper mold body 30 in the Z direction is greater than the length of the lower mold body 20 in the Z direction. The mold surface of the upper mold body 30 is the upper mold surface 30a. The upper mold concave portion 31, which has the same shape as the lower mold concave portion 21, has an upper mold bottom surface and faces the lower mold concave portion 21 in the Z direction. The upper mold indentation portion 32 (see Figure 6 ) has the same shape as the lower mold indentation portion 22 and faces the lower mold indentation portion 22 in the Z direction. The upper mold indentation portion 32 is crimped to the crimping forming portion 112 located at the end of the electric wire 101, thereby transferring the shape of the upper mold indentation portion 32 to the crimping portion 114 to form the upper crimping portion 114b of the crimping portion 114 (see Figure 7 and Figure 8 The upper mold indentation portion 32 includes an upper mold central protrusion 32a and a pair of upper mold indentation bottom surfaces 32b. One upper mold indentation bottom surface 32b is continuous with the first inclined side surface 31b. The other upper mold indentation bottom surface 32b is continuous with the second inclined side surface 31c.

[0053] In addition, the upper mold 16 has an upper mold recess 33 (see Figure 6 ) and an upper mold protrusion 34. The upper mold concave portion 33 has the same shape as the lower mold concave portion 23 and engages with the lower mold protrusion 24 when approaching the lower mold 14. The upper mold protrusion 34 has the same shape as the lower mold protrusion 24 and engages with the lower mold concave portion 23 when approaching the lower mold 14. Note that, like the lower mold protrusion 24, the upper mold protrusion 34 is regarded as a wall standing upright on the front side of the upper mold indentation portion 32, and can therefore be called a "horizontal wall" or "pillar."

[0054] Furthermore, the driving tool moves the frame support 13 b relative to the frame main body 13 a in the Z direction, thereby moving the upper mold 16 closer to and away from the lower mold 14 in the Z direction.

[0055] Next, a description will be given of steps for manufacturing the terminal-attached electric wire 100 by the terminal crimping device 1 including the swaging die 10 .

[0056] Figure 6 is with Figure 1 The VI-VI section in FIG. 1 corresponds to a cross-sectional view of the die 10. Specifically, Figure 6 It is a partial cross-sectional view showing the state of the lower mold 14 and the upper mold 16 before the crimping forming portion 112 of the crimping terminal 110 is placed on the lower mold indentation portion 22 of the lower mold 14 and the crimping forming portion 112 is crimped to the electric wire 101, that is, before the lower mold 14 and the upper mold 16 are brought close to each other.

[0057] Figure 7 is a partial cross-sectional view showing the state of the lower mold 14 and the upper mold 16, wherein the upper mold 16 is Figure 6 The state shown is close to the lower mold 14 , and then the crimping forming portion 112 is pressed to form the crimping portion 114 .

[0058] Figure 8 It is shown in Figure 7 The state shown is a partial cross-sectional view of a state in which the upper mold 16 and the lower mold 14 are separated and the finally formed crimping portion 114 is located on the lower mold indentation portion 22 of the lower mold 14 .

[0059] First, a step is performed in the terminal crimping device 1 to insert a portion of the electric wire 101 into the crimping forming portion 112. Specifically, the crimping terminal 110 is mounted in a predetermined position in the terminal crimping device 1 so that the crimping forming portion 112 is positioned over the lower die indentation 22. Next, the electric wire 101 is placed on the first retaining member 12a of the electric wire retaining member 12, and then the core wire 102 of the electric wire 101 is inserted into the insertion hole 112a of the crimping forming portion 112. Next, the second retaining member 12b is brought close to the first retaining member 12a, thereby retaining the electric wire 101 between the first retaining member 12a and the second retaining member 12b. Figure 6 The state of the press-bonding forming portion 112 at this stage is shown in FIG.

[0060] Next, the step of crimping the electric wire 101 to the crimping forming portion 112 is performed in the terminal crimping device 1. Specifically, the terminal crimping device 1 moves the upper die 16 toward the lower die 14 by driving the driving tool. By this operation, as shown in FIG. Figure 7As shown, the upper mold 16 is brought close to the lower mold 14, and the crimping forming portion 112 is pressed (compressed) by being held between the lower mold indentation portion 22 and the upper mold indentation portion 32. At this time, the crimping forming portion 112 is extended in the Y direction while being compressed in the Z direction, and finally, the shapes of the lower mold indentation portion 22 and the upper mold indentation portion 32 are transferred to the crimping terminal 110 to form the crimping portion 114. In this way, the terminal crimping device 1 crimps the core wire 102 inserted into the insertion hole 112a of the crimping terminal 110 and the crimping forming portion 112, thereby producing a terminal as shown in FIG. Figure 2 The illustrated crimp terminal 110 and the electric wire 101 are integrated into a terminal-attached electric wire 100 .

[0061] Thereafter, the terminal crimping device 1 drives the driving tool again to move the upper die 16 away from the lower die 14. By this operation, as shown in FIG. Figure 8 As shown, the upper mold 16 and the lower mold 14 are separated from each other, and the terminal-attached electric wire 100 can be taken out from the lower mold 14 .

[0062] Next, the setting of the indentation length L1 and the compression ratio at the crimping portion 114, which are factors that determine the shapes of the lower mold indentation 22 and the upper mold indentation 32, will be described. Here, since the shapes of the lower mold indentation 22 and the upper mold indentation 32 are the same, the following description will focus on the setting of the lower mold indentation 22.

[0063] Figure 9 corresponds to Figure 5 A partial cross-sectional view of the lower mold 14 at section IX-IX. Figure 9 The cross section in φ is a virtual XZ plane passing through the middle position of the lower mold indentation portion 22 in the width direction corresponding to the Y direction of the lower mold 14 .

[0064] First, in the longitudinal direction corresponding to the X-direction of the lower mold 14, the width of the lower mold body 20 is defined as a first width W1, and the width of the lower mold protrusion 24 is defined as a second width W2. Second width W2 is shorter than first width W1. Similarly, in the longitudinal direction, the length of the distal end surface 22c of the lower mold central protrusion 22a of the lower mold indentation 22 is defined as indentation length L1. The lower mold indentation 22 is arranged within the range defined by the second width W2 in the longitudinal direction. In other words, indentation length L1 is shorter than second width W2.

[0065] The lower mold indentation portion 22 has a front wall surface 22d and a rear wall surface 22e as wall portions that are opposite to each other in the longitudinal direction. The front wall surface 22d and the rear wall surface 22e are inclined so that the distance between them in the longitudinal direction gradually increases from the end surface 22c of the lower mold central protrusion 22a toward the lower mold bottom surface 21a. Here, the edge where the front wall surface 22d meets the end surface 22c is defined as the first edge 22f, and the edge where the rear wall surface 22e meets the end surface 22c is defined as the second edge 22g. The inclination angle of the front wall surface 22d from the first edge 22f relative to the vertical axis AX and the inclination angle of the rear wall surface 22e from the second edge 22g relative to the vertical axis AX are respectively defined as the indentation angle θ1. In this case, the indentation angle θ1 is set within the range of 20° to 30°.

[0066] Figure 10 is with Figure 2 The XX section in FIG. 1 corresponds to a partial cross-sectional view of the electric wire 100 with the terminal attached. Specifically, Figure 10 1 is a cross-sectional view of the crimping portion 114 and its surroundings in the terminal-attached electric wire 100 . Figure 10 The cross section in is an imaginary XZ plane passing through the central axis of the crimping terminal 110 .

[0067] In crimping portion 114, the shape of lower mold indentation 22 is transferred to form lower crimping portion 114a, and the shape of upper mold indentation 32 is transferred to form upper crimping portion 114b. Lower mold central protrusion 22a abuts a portion of lower crimping portion 114a, causing this portion to be significantly recessed to form lower crimping recess 114c. Similarly, upper mold central protrusion 32a abuts a portion of upper crimping portion 114b, causing it to be significantly recessed to form upper crimping recess 114d.

[0068] Furthermore, each of the lower crimping recess 114c and the upper crimping recess 114d has a bottom surface 114e, as well as a front inner wall surface 114f and a rear inner wall surface 114g that are opposite to each other in the longitudinal direction. The front inner wall surface 114f and the rear inner wall surface 114g are inclined so that the distance between them in the longitudinal direction gradually narrows from the main surface of the lower crimping portion 114a or the upper crimping portion 114b toward the bottom surface 114e. Here, the length of the bottom surface 114e in the longitudinal direction is defined as the recess length L2.

[0069] Furthermore, in the crimping portion 114, a portion which is located closest to the rear end of the coated portion 103 of the electric wire 101 in the longitudinal direction corresponding to the X direction and in which the lower crimping recess 114c and the upper crimping recess 114d are not directly formed is hereinafter referred to as a "rear flare portion". Figure 10 , the portion corresponding to the rear bell mouth portion 114j is surrounded by a dotted-line frame.

[0070] Figure 11 The crimping portion 114 is Figure 10 . Specifically, the measurement section C is a YZ plane passing through the middle position of the crimping portion 114 in the longitudinal direction corresponding to the X direction. Hereinafter, for the conductor corresponding to the core wire 102 of the electric wire 101, the compression ratio (%) at the measurement section C is expressed as [the cross-sectional area of ​​the conductor after crimping (mm 2 ) / conductor cross-sectional area before crimping (mm 2 )] by 100.

[0071] In the crimping portion 114 , the core wire 102 , which is a bundle of multiple single wires, is held between the lower crimping portion 114 a and the upper crimping portion 114 b and is pressed into the insertion hole 112 a , so that the core wire 102 is in close contact with the crimping terminal 110 , thereby ensuring a conductive path.

[0072] Next, refer to Figures 12 to 14 , the measurement results of the voltage drop at the crimping portion 114 with respect to the indentation length L1 will be described as the electrical properties of the terminal-attached electric wire 100 .

[0073] Figure 12 : is a graph showing the ratio of the voltage drop at the crimping portion 114 to the indentation length L1 as the electrical performance of the terminal-attached electric wire 100 in Example 1. Figure 12 In FIG, the horizontal axis represents the indentation length L1 (mm), and the vertical axis represents the ratio when the voltage drop is 1.0 when the indentation length L1 is 8.0 mm. Under the following various conditions, the voltage drop at the crimping portion 114 is measured by changing the indentation length L1, and the Figure 12 The measurement results are shown.

[0074] The electric wire 101 in Example 1 has a core wire 102 including a plurality of single wires made of copper and having a wire diameter of φ0.32 mm. The conductor size of the core wire 102 is 40 sq (conductor cross-sectional area: 39.73 mm 2 ).

[0075] The main material of the crimping terminal 110 in Example 1 is oxygen-free copper. Copper / silver plating is applied to the crimping terminal 110 as a base, and further silver plating is applied. The thickness of the crimping forming portion 112 is 2.2 mm.

[0076] Furthermore, in the lower mold 14 and the upper mold 16 used to manufacture the terminal-attached electric wire 100 in Example 1, the conditions related to the shapes of the lower mold indentation portion 22 and the upper mold indentation portion 32 as indentation portions are as follows: the indentation width W is 3.0 mm; and the indentation height H is 1.5 mm.

[0077] First, as a first measurement result in Example 1, when the indentation length L1 was 8.0 mm, that is, when the recess length L2 at the crimping portion 114 was approximately 8.0 mm, the voltage drop was judged to be within the acceptable range of the electrical performance of the terminal-attached electric wire 100. Here, the lower the ratio of the voltage drop compared to 1.0, the better the electrical performance is judged to be, and the higher the ratio of the voltage drop compared to 1.0, the worse the electrical performance is judged to be.

[0078] As a result of the second measurement in Example 1, when the indentation length L1 was 3.0 mm, that is, when the recess length L2 in the crimping portion 114 was approximately 3.0 mm, the voltage drop ratio was 8.2. This ratio was greater than 1.0, and it was judged that the electrical performance of the terminal-attached electric wire 100 was poor.

[0079] As a result of the third measurement in Example 1, when the indentation length L1 was 4.0 mm, that is, when the recess length L2 in the crimping portion 114 was approximately 4.0 mm, the voltage drop ratio was 1.7. This ratio was higher than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be poor.

[0080] As a result of the fourth measurement in Example 1, when the indentation length L1 was 5.0 mm, that is, when the recess length L2 in the crimping portion 114 was approximately 5.0 mm, the voltage drop ratio was 1.5. This ratio was higher than 1.0, and it was judged that the electrical performance of the terminal-attached electric wire 100 was poor.

[0081] As a result of the fifth measurement in Example 1, when the indentation length L1 was 6.5 mm, that is, when the recess length L2 in the crimping portion 114 was approximately 6.5 mm, the voltage drop ratio was 1.1. This ratio was equal to 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0082] Furthermore, as a result of the sixth measurement in Example 1, when the indentation length L1 was 12.5 mm, that is, when the recess length L2 in the crimping portion 114 was approximately 12.5 mm, the voltage drop ratio was 2.2. This ratio was higher than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be poor. However, in this case, the indentation length L1 was set relatively long, and the lower crimping recess 114c and the upper crimping recess 114d were formed to the rear end of the crimping portion 114. As a result, the rear flared portion 114j was absent.

[0083] Therefore, regarding the electrical performance of the terminal-attached electric wire 100 in Example 1, the voltage drop at the crimping portion 114 is preferably characterized by the presence of the rear flare portion 114j and an indentation length L1 of 6.5 mm or greater. Under these conditions, when the indentation length L1 is set to 8.0 mm or greater, the voltage drop at the crimping portion 114 is considered to be stable within a good range. While the core wire 102 of the electric wire 101 in Example 1 comprises multiple single wires made of annealed copper and having a wire diameter of 0.32 mm, similar results can be achieved when the core wire comprises multiple single wires made of annealed copper and having a wire diameter of 0.20 mm.

[0084] Figure 13 : is a graph showing the ratio of the voltage drop at the crimping portion 114 to the indentation length L1 as the electrical performance of Example 2 of the terminal-attached electric wire 100. Figure 13 In FIG, the horizontal axis is the indentation length L1 (mm), and the vertical axis is the ratio when the voltage drop is 1.0 when the indentation length L1 is 7.25 mm. Under the following various conditions, the voltage drop at the crimping portion 114 is measured by changing the indentation length L1, and the Figure 13 The measurement results are shown.

[0085] The electric wire 101 in Example 2 has a core wire 102 including a plurality of single wires made of soft copper and having a diameter of φ0.32 mm. The conductor size of the core wire 102 is 95 sq (conductor cross-sectional area: 96.27 mm 2 ).

[0086] The main material of the crimping terminal 110 in Example 2 is tough pitch copper. Copper / silver plating is applied to the crimping terminal 110 as a base, and further silver plating is applied. The thickness of the crimping forming portion 112 is 2.0 mm.

[0087] In the lower mold 14 and the upper mold 16 used to manufacture the terminal-attached electric wire 100 in Example 2, the conditions related to the shapes of the lower mold indentation portion 22 and the upper mold indentation portion 32 as the indentation portions are as follows: the indentation width W is 3.95 mm; and the indentation height H is 2.55 mm.

[0088] First, as a first measurement result in Example 2, when the indentation length L1 was 7.25 mm, that is, when the recess length L2 at the crimping portion 114 was approximately 7.25 mm, the voltage drop was judged to be within the acceptable range of the electrical performance of the terminal-attached electric wire 100. Here, when the voltage drop ratio becomes lower than 1.0, the electrical performance is judged to be better, and when the ratio becomes higher than 1.0, the electrical performance is judged to be worse.

[0089] Furthermore, as a result of the second measurement in Example 2, when the indentation length L1 was 11.6 mm, that is, when the recess length L2 in the crimping portion 114 was approximately 11.6 mm, the voltage drop ratio was 0.7. This ratio was lower than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0090] Therefore, regarding the voltage drop at the crimping portion 114, the electrical performance of the terminal-attached electric wire 100 in Example 2 meets the conditions assumed in Example 1. The conditions here are the presence of the rear flare portion 114j and the indentation length L1 being preferably 6.5 mm or longer. While the core wire 102 of the electric wire 101 in Example 2 comprises a plurality of soft copper wires having a wire diameter of 0.32 mm, similar results can be achieved when the core wire comprises a plurality of soft copper wires having a wire diameter of 0.20 mm.

[0091] Figure 14 : is a graph showing the ratio of the voltage drop at the crimping portion 114 to the indentation length L1 as the electrical performance of the terminal-attached electric wire 100 in Example 3. Figure 14 In the example 1, the horizontal axis represents the indentation length L1 (mm), and the vertical axis represents the ratio when the voltage drop is 1.0 when the indentation length L1 is 8 mm under the same conditions as in Example 1. Under the following various conditions, the voltage drop at the crimping portion 114 was measured and obtained. Figure 14 The measurement results are shown.

[0092] The electric wire 101 in Example 3 has a core wire 102 including a plurality of single wires made of soft copper and having a diameter of φ0.80 mm. The conductor size of the core wire 102 is 40 sq.

[0093] Note that the crimping terminal 110 in Example 3 is the same as the crimping terminal 110 in Example 1. Furthermore, the lower mold 14 and the upper mold 16 used to manufacture the terminal-attached electric wire 100 in Example 3 are the same as those used to manufacture the terminal-attached electric wire 100 in Example 1.

[0094] As a result of measurement in Example 3, when the indentation length L1 was 8.0 mm, that is, when the recess length L2 at the crimping portion 114 was approximately 8.0 mm, the voltage drop ratio was 0.12. This ratio was equivalent to 1.0 in Example 1, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0095] Therefore, the electrical performance of the terminal-attached electric wire 100 in Example 3 satisfies the conditions assumed in Example 1 with respect to the voltage drop at the crimping portion 114 .

[0096] Next, refer to Figures 15 to 17, the measurement results of the voltage drop with respect to the compression ratio at the crimping portion 114 as the electrical performance of the terminal-attached electric wire 100 will be described.

[0097] Figure 15 : is a graph showing the ratio of the voltage drop at the crimping portion 114 to the compression ratio as the electrical performance of Example 1 of the terminal-attached electric wire 100. Figure 15 In FIG. 1 , the horizontal axis represents the compression ratio (%) at the crimping portion 114, and the vertical axis represents the ratio when the voltage drop is 1.0 when the compression ratio is 58.3%. The voltage drop at the crimping portion 114 is measured by changing the compression ratio relative to Example 1 of the terminal-attached electric wire 100, and the voltage drop is obtained. Figure 15 The measurement results are shown.

[0098] First, as a first measurement result in Example 1, the voltage drop at a compression ratio of 58.3% was judged to be within an acceptable range as the electrical performance of the terminal-attached electric wire 100. Here, when the ratio of the voltage drop becomes lower than 1.0, the electrical performance is judged to be better, and when the ratio becomes higher than 1.0, the electrical performance is judged to be worse.

[0099] As a second measurement result in Example 1, the ratio of the voltage drop when the compression ratio was 40.9% was 0.3. This ratio was lower than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0100] As a result of the third measurement in Example 1, the ratio of the voltage drop when the compression ratio was 72.2% was 2.19. This ratio was higher than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be poor.

[0101] As a result of the fourth measurement in Example 1, the ratio of the voltage drop when the compression ratio was 79.6% was 6.19. This ratio was higher than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be poor.

[0102] Furthermore, as a result of the fifth measurement in Example 1, the ratio of the voltage drop when the compression ratio was 103.6% was 8.06. This ratio was higher than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be poor.

[0103] Therefore, according to Figure 15 As shown in the voltage drop trend at the crimping portion 114 , it can be understood that the higher the compression ratio, the higher the voltage drop, ie, the lower the electrical performance.

[0104] Therefore, to maintain the electrical performance of Example 1 of the terminal-attached electric wire 100, it is ideal that the compression ratio be set to 70% or less relative to the voltage drop at the crimping portion 114. Furthermore, the lower limit of the desired compression ratio should be a value that satisfies the following conditions: the tensile strength of the crimping portion 114 is ensured; and the core wire 102 does not break.

[0105] Figure 16 : is a graph showing the ratio of the voltage drop at the crimping portion 114 to the compression ratio as the electrical performance of Example 2 of the terminal-attached electric wire 100. Figure 16 In FIG. 1 , the horizontal axis is the compression ratio (%) at the crimping portion 114, and the vertical axis is the ratio when the voltage drop is 1.0 when the compression ratio is 60.6%. The voltage drop at the crimping portion 114 was measured by changing the compression ratio relative to Example 2 of the terminal-attached electric wire 100, and the voltage drop was obtained. Figure 16 The measurement results are shown.

[0106] First, as a first measurement result in Example 2, the voltage drop at a compression ratio of 60.6% was judged to be within an acceptable range as the electrical performance of the terminal-attached electric wire 100. Here, the lower the ratio of the voltage drop compared to 1.0, the better the electrical performance is judged to be, and the higher the ratio of the voltage drop compared to 1.0, the worse the electrical performance is judged to be.

[0107] As a result of the second measurement in Example 2, the ratio of the voltage drop at a compression ratio of 41.4% was 0.58. This ratio was lower than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0108] As a result of the third measurement in Example 2, the ratio of the voltage drop at a compression ratio of 54.5% was 0.6. This ratio was lower than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0109] As a result of the fourth measurement in Example 2, the ratio of the voltage drop at a compression ratio of 65.4% was 1.28. This ratio was equivalent to 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0110] Therefore, with respect to the voltage drop at the crimping portion 114, the electrical performance of the terminal-attached electric wire 100 in Example 2 satisfies the conditions assumed in Example 1. The conditions here are that the compression ratio is set to 70% or less, and the lower limit of the compression ratio is a value that satisfies the following conditions: the tensile strength at the crimping portion 114 is ensured; and breakage of the core wire 102 does not occur.

[0111] Figure 17 : is a graph showing the ratio of the voltage drop at the crimping portion 114 to the compression ratio as the electrical performance of Example 3 of the terminal-attached electric wire 100. Figure 17In the figure, the horizontal axis is the compression ratio (%) at the crimping portion 114, and the vertical axis is the ratio when the voltage drop is 1.0 when the compression ratio is 58.3% under the wire diameter condition of Example 1. The voltage drop at the crimping portion 114 is measured by changing the compression ratio of Example 3 relative to the terminal-attached electric wire 100, and the obtained Figure 17 The measurement results are shown.

[0112] As a result of measurement in Example 3, when the wire diameter was changed to φ0.80 mm from the condition in Example 1, the ratio of voltage drop at a compression ratio of 60.3% was 0.14. In Example 1, this ratio was lower than 1.0, and the electrical performance of the terminal-attached electric wire 100 was judged to be good.

[0113] Therefore, the electrical performance of the terminal-attached electric wire 100 in Example 3 satisfies the conditions assumed in Example 1 with respect to the voltage drop at the crimping portion 114 .

[0114] Next, the swaging die 10 , a method of manufacturing the terminal-attached electric wire 100 , and effects of the terminal-attached electric wire 100 will be described.

[0115] The swaging die 10 according to the present embodiment includes a lower die 14 and an upper die 16 for crimping the crimping forming portion 112 of the crimping terminal 110 to the electric wire 101 when the lower die 14 and the upper die 16 are brought close to each other in the vertical direction. The lower die 14 and the upper die 16 each have a rectangular parallelepiped shape whose cross section in a horizontal plane is defined in a length direction aligned with the axial direction of the crimping forming portion 112 and in a width direction perpendicular to the length direction.

[0116] The lower mold 14 includes a lower mold indentation 22, which is disposed in the lower mold concave portion 21 and has a lower mold central protrusion 22a that protrudes in the crimping direction. The lower mold concave portion 21 is formed on the lower mold surface 20a oriented in the crimping direction and contacts the crimping forming portion 112 along the length direction. The lower mold 14 has a lower mold concave portion 23 adjacent to one end of the lower mold indentation 22 in the width direction and extending from the lower mold surface 20a in a direction opposite to the crimping direction. The lower mold 14 also has a lower mold protrusion 24 adjacent to the other end of the lower mold indentation 22 in the width direction and protruding from the lower mold surface 20a in the crimping direction.

[0117] The upper mold 16 includes an upper mold indentation 32, which includes an upper mold central protrusion 32a disposed in the upper mold concave portion 31 and protruding in the crimping direction. The upper mold concave portion 31 is formed on the upper mold surface 30a oriented in the crimping direction and contacts the crimping forming portion 112 in the longitudinal direction. The upper mold 16 has an upper mold concave portion 33 adjacent to one end of the upper mold indentation 32 in the width direction and extending from the upper mold surface 30a in a direction opposite to the crimping direction. In addition, the upper mold 16 has an upper mold protrusion 34 adjacent to the other end of the upper mold indentation 32 in the width direction and protruding from the upper mold surface 30a in the crimping direction.

[0118] Furthermore, it is assumed that the conductor size of the core wire 102 of the electric wire 101 crimped by the crimping forming portion 112 is within the range of 40 sq to 95 sq, and the diameter of the plurality of individual wires constituting the core wire 102 is 0.20 mm to 0.80 mm. In this case, in the lower mold 14, the indentation length L1, which is designated as the length in the longitudinal direction of the distal end surface 22c of the lower mold central protrusion 22a of the lower mold indentation portion 22, is 6.5 mm or longer. The indentation length L1 in the upper mold 16 is similarly designated.

[0119] Here, as described above, the vertical direction corresponds to the Z direction, the length direction corresponds to the X direction, and the width direction corresponds to the Y direction. In addition, the crimping direction of the lower mold 14 corresponds to the Z direction, and the crimping direction of the upper mold 16 corresponds to the direction opposite to the Z direction.

[0120] First, according to the pressing die 10, when the lower die 14 and the upper die 16 are closest to each other, the lower die indentation 22 and the upper die indentation 32 press the crimping forming portion 112 in the Y direction while being held between the lower die convex portion 24 and the upper die convex portion 34 to form the crimping portion 114. At this time, the lower die convex portion 24 and the upper die convex portion 34 restrict the plastic deformation of the crimping forming portion 112 due to expansion of its outer surface in the Y direction, thereby preventing the occurrence of burrs in the crimping portion 114.

[0121] In addition, the indentation length L1 of the lower die 14 and the upper die 16 in the embossing die 10 is set to be 6.5 mm or more. Figures 12 to 14 As shown in the figure, the terminal-attached electric wire 100 manufactured using the swaging die 10 can reduce the voltage drop at the crimping portion 114 when actually used as a product.

[0122] As described above, according to the present embodiment, it is possible to provide a swaging die 10 that improves the electrical performance of the terminal-attached electric wire 100 .

[0123] The method for manufacturing a terminal-attached electric wire 100 according to this embodiment is a method for manufacturing the terminal-attached electric wire 100 by crimping the crimping forming portion 112 of a crimping terminal 110 to an electric wire 101. This method includes the steps of inserting a portion of the electric wire 101 into the crimping forming portion 112, and crimping the electric wire 101 to the crimping forming portion 112 by holding the crimping forming portion 112, into which the portion of the electric wire 101 is inserted, with a press die including a lower die and an upper die. The press die is the press die 10 according to the above-described embodiment.

[0124] According to the manufacturing method, the terminal-fitted electric wire 100 is manufactured using the swaging die 10 , so that the terminal-fitted electric wire 100 having improved electrical performance can be provided.

[0125] In the method for manufacturing the terminal-attached electric wire 100, the crimping portion 114 formed by being held by the embossing die 10 can have a lower crimping recess 114c and an upper crimping recess 114d. The lower crimping recess 114c has the shape of the lower mold center protrusion 22a of the lower mold indentation 22 transferred thereto, and the upper crimping recess 114d is similarly formed. In this case, the embossing die 10 can hold the crimping forming portion 112 in such a manner that the rear end of the crimping portion 114 in the longitudinal direction has a rear flared portion 114j, where the lower crimping recess 114c and the upper crimping recess 114d are not provided.

[0126] According to this manufacturing method, as shown in reference Figures 12 to 14 As described in FIG, the voltage drop at the crimping portion 114 can be reduced, and thus the terminal-attached electric wire 100 with improved electrical performance can be provided.

[0127] Furthermore, in the method for manufacturing the terminal-attached electric wire 100, the compression ratio of the conductor cross-sectional area of ​​the core wire 102 passing through the middle position in the longitudinal direction of the crimping portion 114, which is expressed as a value obtained by multiplying (conductor cross-sectional area after crimping / conductor cross-sectional area before crimping) by 100, can be set to 70% or less. In this case, the lower limit value of the compression ratio can be set to a value at which tensile strength is ensured at the crimping portion 114 and breakage of the core wire 102 does not occur.

[0128] According to this manufacturing method, as shown in reference Figures 15 to 17 As described in FIG, the voltage drop at the crimping portion 114 can be reduced, and thus the terminal-attached electric wire 100 with improved electrical performance can be provided.

[0129] Furthermore, the terminal-attached electric wire 100 according to this embodiment includes a crimping portion 114 formed by holding a crimping forming portion 112 of a crimping terminal 110 with a press die 10 comprising a lower die 14 and an upper die 16, with a portion of the electric wire 101 inserted into the crimping terminal 110. Crimping portion 114 has a lower crimping recess 114c that transfers a portion of the convex shape of the lower die 14, and an upper crimping recess 114d that transfers a portion of the convex shape of the upper die 16. It is assumed that the conductor size of the core wire 102 of the electric wire 101 crimped by the crimping forming portion 112 is within a range of 40 sq to 95 sq, and the wire diameter of the plurality of individual wires constituting the core wire 102 is 0.20 mm to 0.80 mm. In this case, the recess length L2 defined as the length of the bottom surfaces 114 e of the lower and upper crimping recesses 114 c and 114 d in the longitudinal direction aligned with the axial direction of the crimping forming portion 112 is 6.5 mm or more.

[0130] According to the terminal-attached electric wire 100, for example, when the press die 10 is used, the concave length L2 of the crimping portion 114 is in the range of 6.5 mm or more. Figures 11 to 13 As shown in the figure, since the voltage drop at the crimping portion 114 can be reduced when used as a product, the electrical performance of the terminal-attached electric wire 100 can be improved.

[0131] Furthermore, in the terminal-attached electric wire 100 , the rear end of the crimping portion 114 in the length direction may include a rear bell-mouth portion 114 j where the lower crimping recess 114 c and the upper crimping recess 114 d are not provided.

[0132] As reference Figures 12 to 14 As described in the drawings, the terminal-attached electric wire 100 can reduce the voltage drop at the crimping portion 114, so that the terminal-attached electric wire 100 with improved electrical performance can be provided.

[0133] In addition, in the terminal-attached electric wire 100, the compression ratio expressed as a value obtained by multiplying (conductor cross-sectional area after crimping / conductor cross-sectional area before crimping) by 100 relative to the conductor cross-sectional area of ​​the core wire 102 at the middle position in the longitudinal direction passing through the crimping portion 114 can be 70% or less.

[0134] According to the terminal-attached electric wire 100, as shown in FIG. Figures 15 to 17 As described in FIG, the voltage drop at the crimping portion 114 can be reduced, and therefore, the terminal-attached electric wire 100 having improved electrical performance can be provided.

[0135] In the above description, the swaging die 10 used for the terminal crimping device 1 is exemplified, but the structure or shape of the swaging die 10 can also be used for a crimping tool.

[0136] Although the present invention has been described above with reference to the embodiment, the present invention is not limited thereto, and the configuration of components can be replaced with any configuration having the same function within the scope of the claims.

Claims

1. A press die, comprising a lower die and an upper die, wherein the lower die and the upper die are used to press a crimping forming portion of a crimping terminal to an electric wire when the lower die and the upper die are close to each other in a vertical direction, wherein: The lower mold and the upper mold each have a rectangular parallelepiped shape, and a cross section on a horizontal plane of the rectangular parallelepiped is defined in a length direction aligned with the axial direction of the crimping forming portion and in a width direction perpendicular to the length direction. The lower mold and the upper mold each include: an indentation portion provided in the concave portion and having a central convex portion protruding in the crimping direction, the concave portion being formed on a die surface oriented in the crimping direction and in contact with the crimping forming portion along the length direction; a recessed portion adjacent to one end of the indented portion in the width direction and extending from the mold surface in a direction opposite to the crimping direction; and a convex portion adjacent to the other end of the indentation portion in the width direction and protruding from the mold surface in the crimping direction, and When the conductor size of the core wire of the electric wire crimped by the crimping forming portion is within the range of greater than 40sq and less than 95sq, and the wire diameter of the multiple single wires constituting the core wire is greater than 0.20mm and less than 0.80mm, the indentation length, which is designated as the length in the longitudinal direction of the end surface of the central protrusion of the indentation portion, is greater than 6.5mm.

2. A method for manufacturing a terminal-attached electric wire, wherein a crimping forming portion of a crimping terminal is crimped to the electric wire, the method comprising: inserting a portion of the electric wire into the crimping forming portion; as well as The step of holding the crimping forming portion into which a portion of the electric wire is inserted by using a swaging die including a lower die and an upper die, and wherein, The pressing die is the pressing die according to claim 1.

3. The method for manufacturing a terminal-attached electric wire according to claim 2, wherein: The crimping portion formed by being held by the die pressing mold has a crimping recess into which the shape of the central convex portion of the die impression is transferred, and The pressing die holds the crimping forming portion in such a manner that the rear end of the crimping portion in the longitudinal direction has a rear bell mouth portion where no crimping recess is provided.

4. The method for manufacturing a terminal-attached electric wire according to claim 3, wherein: A compression ratio relative to a conductor cross-sectional area of ​​the core wire passing through a middle position in the longitudinal direction of the crimping portion is set to 70% or less, the compression ratio being expressed as a value obtained by multiplying (conductor cross-sectional area after crimping / conductor cross-sectional area before crimping) by 100, and The lower limit value of the compression ratio is set to a value at which the tensile strength at the crimping portion is ensured and breakage of the core wire does not occur.

5. An electric wire equipped with a terminal, comprising: The crimping portion is formed by holding a crimping forming portion into which a portion of the electric wire is inserted using a dies including a lower die and an upper die, wherein The crimping portion has a lower crimping recess and an upper crimping recess, a convex shape of a portion of the lower mold is transferred to the lower crimping recess, and a convex shape of a portion of the upper mold is transferred to the upper crimping recess, The conductor size of the core wire of the electric wire to which the crimping forming portion is crimped is within a range of 40 sq to 95 sq, and the wire diameters of the plurality of single wires constituting the core wire are 0.20 mm to 0.80 mm, and The recess length is 6.5 mm or more, and the recess length is defined as the length of the bottom surfaces of the lower and upper crimping recesses in a longitudinal direction aligned with the axial direction of the crimping formed portion.

6. The terminal-attached electric wire according to claim 5, wherein The rear end of the crimping portion in the longitudinal direction includes a rear bell mouth portion, and the lower crimping recess and the upper crimping recess are not provided at the rear bell mouth portion.

7. The terminal-attached electric wire according to claim 6, wherein The compression ratio relative to the conductor cross-sectional area of ​​the core wire passing through the middle position in the longitudinal direction of the crimping portion is 70% or less, and the compression ratio is expressed as a value obtained by multiplying (conductor cross-sectional area after crimping / conductor cross-sectional area before crimping) by 100.

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