JP2016110770A - Wire with terminal and crimping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with a terminal capable of keeping a desired quality by controlling a protrusion direction of burrs, and a crimping device for manufacturing the wire with the terminal.SOLUTION: The wire with the terminal comprises a wire and a terminal including a cylindrical crimp part 30 to which the wire is crimped. The terminal comprises first and second molds which have burrs 351 and 352 protruding in a direction crossing a radial direction of the crimp part 30 and compress the crimp part 30 in a vertical direction in the state where the wire is inserted into the crimp part of the terminal. At least one of the first and second molds have projections that protrude towards at least the other of the second and first molds. At least the other of the second and first molds has recesses that receive the projections. The projections are neighboring to cavities of the first and second molds, at least one of the recesses is formed relatively wider than the projection in such a manner that a gap is formed between the projection and the recess in the state where the projection enters the recess, and the gap is communicated to the cavity.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a terminal-attached electric wire and a crimping apparatus for manufacturing the terminal-attached electric wire.

  There is known a technique for crimping an electric wire and a terminal by compressing the terminal from above and below using a crimping device in a state where the electric wire is inserted into a cylindrical terminal (for example, see Patent Document 1).

JP 2001-326053 A

  In the above technique, the outer shape of the terminal is deformed from a circular shape to a substantially hexagonal shape by compressing in the vertical direction, so that a burr protruding in the radial direction of the terminal is generated due to the excess thickness. There is a problem that the peripheral members are damaged by the burrs and the desired quality may not be ensured.

  The problem to be solved by the present invention is to provide a terminal-attached electric wire capable of ensuring a desired quality by controlling the protruding direction of the burr, and a crimping apparatus for manufacturing the terminal-attached electric wire. .

  [1] An electric wire with a terminal according to the present invention is an electric wire with a terminal including an electric wire and a terminal having a cylindrical crimping portion to which the electric wire is crimped, and the terminal has a diameter of the crimping portion. A burr projecting in a direction intersecting the direction is provided.

  [2] In the above invention, the crimping portion connects a plurality of apex portions projecting outward in the radial direction of the crimping portion and the apex portions adjacent to each other, and the radial direction of the crimping portion. A curved portion projecting inwardly in a curved shape, and the burr is formed from at least one of the two vertex portions facing each other among the plurality of vertex portions. It may be protruding.

  [3] In the above invention, the burr includes a first burr protruding from one end in the cross section of the pressure-bonding portion and a second burr protruding from the other end in the cross-section of the pressure-bonding portion. In addition, the first burrs and the second burrs may be alternately formed in the extending direction of the crimping portion.

  [4] A crimping device according to the present invention is a crimping device that crimps an electric wire and a terminal, and compresses the crimping portion from above and below in a state where the electric wire is inserted into the crimping portion of the terminal. And at least one of the first and second molds has a protrusion protruding toward at least the other of the second and first molds, and the second mold And at least the other of the first mold has a concave portion for receiving the convex portion, and the convex portion is adjacent to the cavity of the first and second molds, and among the concave portions, At least one of the protrusions is formed relatively wider than the protrusions so that a gap is formed between the protrusions and the recesses in a state where the protrusions enter the recesses. The gap is in communication with the cavity.

  [5] In the above invention, the cavity connects a plurality of apex portions protruding toward the radially outer side of the cavity and the apex portions adjacent to each other, and toward the radially inner side of the cavity. It may have a cross-sectional shape composed of a curved portion protruding in a curved shape.

  [6] In the above invention, the convex portion includes a first convex portion formed on the first mold and a second convex portion formed on the second mold, A recess is formed in the first mold and receives the second protrusion, and a second recess is formed in the second mold and receives the first protrusion. The first convex portion and the first concave portion are alternately formed along the extending direction of the cavity, the second convex portion and the second concave portion, It may be formed alternately along the extending direction of the cavity so as to correspond to the first convex portion and the first concave portion.

  [7] In the above invention, the first recess has the gap between the second protrusion and the first recess in a state where the second protrusion enters the first recess. As formed, it may be formed relatively wider than the second convex portion.

  In the present invention, since the burr is protruded in a direction intersecting the radial direction of the crimping portion, damage to surrounding members due to the burr can be suppressed, and desired quality can be ensured.

  Further, according to the present invention, when the first mold and the second mold approach each other, the convex portion enters the concave portion, and accordingly, the end portion in the cross section of the crimp portion is the crimp portion. It is drawn in a direction that intersects the radial direction. Thereby, since the burr | flash which protruded in the direction which cross | intersects with respect to the radial direction of a crimping | compression-bonding part is formed in a crimping | compression-bonding part, damage to the surrounding member by the said burr | flash can be suppressed, and desired quality can be ensured. it can.

FIG. 1 is a side view showing a terminal-attached electric wire according to an embodiment of the present invention. FIG. 2 is a plan view showing the terminal-attached electric wire in the embodiment of the present invention. FIG. 3 is an exploded perspective view of the electric wire with terminal in the embodiment of the present invention. FIG. 4 is a cross-sectional view of the electric wire in the embodiment of the present invention, and is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a cross-sectional view showing the terminal-attached electric wire after waterproofing in the embodiment of the present invention. FIG. 7 is a perspective view showing a mold of the crimping apparatus according to the embodiment of the present invention. FIG. 8 is a perspective view showing the upper mold in the embodiment of the present invention. FIG. 9 is a perspective view showing a lower mold in the embodiment of the present invention. FIG. 10 is a cross-sectional view taken along line XX in FIG. FIG. 11 is a perspective view showing a modification of the upper mold in the embodiment of the present invention. 12 (a) and 12 (b) are cross-sectional views showing a connection step between the electric wire and the terminal in the embodiment of the present invention, and FIG. 12 (a) shows the mold approaching the terminal into which the electric wire is inserted. FIG. 12B is a diagram showing a state in which the electric wire and the terminal are crimped by a mold. FIG. 13A is an enlarged view of the XIIIA portion of FIG. 12A, and FIG. 13B is an enlarged view of the XIIIB portion of FIG. 12A. 14A is an enlarged view of the XIVA part of FIG. 12B, and FIG. 14B is an enlarged view of the XIVB part of FIG. 12B.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are a side view and a plan view showing a terminal-attached electric wire according to this embodiment, and FIG. 3 is an exploded perspective view of the terminal-attached electric wire according to this embodiment.

  As shown in FIGS. 1 to 3, the electric wire with terminal 1 in the embodiment of the present invention includes an electric wire 10 having a stranded wire 11 and an insulating layer 13 and a terminal 20 having a crimping portion 30. The insulating layer 13 is peeled off at the end of the electric wire 10 to expose the stranded wire 11, and the crimped portion 30 is compressed inward with the stranded wire 11 inserted into the crimped portion 30 of the terminal 20. Thereby, the electric wire 10 and the terminal 20 are crimped | bonded.

  FIG. 4 is a cross-sectional view of the electric wire in the present embodiment, and is a view taken along line IV-IV in FIG.

  As shown in FIG. 4, the electric wire 10 in the present embodiment includes a stranded wire 11 formed by twisting a plurality of (10 in this example) strands 12 and an insulating layer covering the outer periphery of the stranded wire 11. 13. In addition, the number of the strands 12 which comprise the twisted wire 11 is not specifically limited to said number in particular. Moreover, it may replace with a twisted wire and an electric wire may have a single wire as a conductor.

  Each strand 12 includes an aluminum wire 121 and a copper coating layer 122 that covers the outer periphery of the aluminum wire 121. The aluminum wire 121 is made of, for example, aluminum or an aluminum alloy containing aluminum as a main component. The copper coating layer 122 is made of, for example, copper or a copper alloy containing copper as a main component.

  The copper-coated aluminum wire (hereinafter also simply referred to as “CA wire”) composed of the aluminum wire 121 and the copper coating layer 122 is formed, for example, by inserting an aluminum wire into an inner hole of a copper tube and drawing it. ing. The CA wire may be formed by performing a copper plating process on the outer peripheral surface of the aluminum wire 121. By using such a CA wire, the weight of the electric wire 10 can be reduced. Instead of the CA wire, a copper wire or a steel wire (so-called CS wire) subjected to copper plating may be used as the strand 12.

The insulating layer 13 is made of a material having electrical insulation properties such as a resin material. As shown in FIG. 3, the insulating layer 13 having a predetermined length L ₀ is peeled off from the end portion of the electric wire 10, and the stranded wire 11 is exposed at the end portion of the electric wire 10. The exposed stranded wire 11 is inserted into the crimping portion 30 of the terminal 20 and crimped to the terminal 20.

  As shown in FIGS. 1 to 3, the terminal 20 in this embodiment includes a crimping portion 30 and a connection portion 40. The terminal 20 is made of, for example, copper or a copper alloy containing copper as a main component, and may further have a tin plating layer on the entire surface thereof.

  The crimp part 30 is provided at one end of the terminal 20 and has a bottomed cylindrical shape. The crimping portion 30 has an insertion hole 31 that opens toward one end of the terminal 20. In a state where the stranded wire 11 of the electric wire 10 is inserted into the insertion hole 31, the electric wire 10 and the terminal 20 are crimped by compressing the crimping portion 30 inward (so-called closed barrel).

  By using such a closed barrel type terminal 20, the electric wire 10 can be wrapped by the crimping portion 30. For this reason, even if it is a case where the aluminum wire 121 of CA line | wire is exposed, generation | occurrence | production of the contact failure by galvanic corrosion can be suppressed.

  In addition, in the example shown in FIGS. 1-3, although the crimping | compression-bonding part 30 has a perfect circular cross-sectional shape, it is not limited to this in particular. For example, the cross-sectional shape of the crimping portion 30 may be an ellipse, a quadrangle, a hexagon, or the like.

  The connection portion 40 is provided at the other end of the terminal 20 and has a substantially L-shape formed by bending a plate-like portion having a uniform thickness. The connection portion 40 includes a first plate-like portion 41, a bent portion 42, and a second plate-like portion 43.

  The first plate-like portion 41 extends from the other end of the crimping portion 30 along substantially the same direction as the extending direction of the crimping portion 30 (X direction in the drawing). The lower surface of the first plate-like portion 41 is located substantially on the same straight line as the lowermost end of the crimping portion 30. Further, the first plate-like portion 41 is relatively thin with respect to the crimping portion 30. For this reason, the crimping portion 30 has an inclined surface 32 at the other end of the crimping portion 30, and the inclined surface 32 is inclined so as to become higher toward one end of the crimping portion 30.

  The bent portion 42 is interposed between the first plate-like portion 41 and the second plate-like portion 43. The connecting portion 40 is bent at a substantially right angle by the bent portion 42. The bending angle of the bent portion 42 is not particularly limited to a right angle and can be set arbitrarily. Further, the second plate portion 43 may be provided on substantially the same plane as the first plate portion 41 without providing the bent portion 42 in the connection portion 40.

  The second plate-like portion 43 extends in a direction (Z direction in the drawing) substantially orthogonal to the extending direction of the crimping portion 30 (X direction in the drawing). Further, a screw hole 431 is formed in the second plate-like portion 43. By inserting a bolt or the like into the screw hole 431, the connecting portion 40 of the terminal 20 is fastened to, for example, a terminal of an automobile battery.

  In this embodiment, since the inclined surface 32 is provided at the other end of the crimping part 30, when the terminal 20 to which the electric wire 10 is attached is fixed to the battery terminal or the like, the interference between the terminal 20 and surrounding members. Can be avoided.

  The electric wire 10 and the terminal 20 described above are crimped by compressing the crimping portion 30 inward in a state where the stranded wire 11 is inserted into the crimping portion 30. 1 and 2, the cross-sectional shape of the crimping portion 30 is deformed from an annular shape to a substantially hexagonal ring shape at both end portions in the axial direction of the crimping portion 30. Moreover, in the center part of the axial direction of the crimping | compression-bonding part 30, the cross-sectional shape of the said crimping | compression-bonding part 30 has deform | transformed from the annular shape into the following cross-sectional shapes.

  Specifically, as shown in FIG. 5, the cross-sectional shape of the central portion of the crimped portion 30 after deformation has six apex portions 331 and 332 and six curved portions 34. Each of the apex portions 331 and 332 protrudes in a convex shape toward the radially outer side of the crimping portion 30. Each of the curved portions 34 connects the apex portions 331 and 332 adjacent to each other and protrudes in a curved shape toward the radially inner side of the crimping portion 30. That is, the cross-sectional shape of the crimped portion 30 after the deformation is an annular shape in which the vertices of the hexagon are curved in a concave shape. 5 is a cross-sectional view taken along the line VV in FIG.

  Incidentally, the six vertex portions 331 and 332 in the present embodiment include two first vertex portions 331 and four second vertex portions 332. The two first apex portions 331 are located at both end portions in the cross section of the crimping portion 30 and each have a rectangular cross sectional shape. On the other hand, the four second apex portions 332 are located at locations other than the end portions in the cross section of the crimping portion 30, and each have a convexly curved cross-sectional shape. The six vertex portions may have the same cross-sectional shape. For example, all the vertex portions may have a convex curved shape like the second vertex portion 332.

  Further, as shown in FIG. 5, the first burr 351 is moved from one first vertex portion 331 (the first vertex portion 331 on the left side in FIG. 5) in the cross section of the crimping portion 30 by the above-described crimping. It protrudes. Similarly, the second burr 352 protrudes from the other first vertex portion 331 (the first vertex portion 331 on the right side in FIG. 5) in the cross section of the crimping portion 30.

  Each of the first and second burrs 351 and 352 has a thickness t of 0.2 mm to 1.0 mm (0.2 mm ≦ t ≦ 1.0 mm). By setting the thickness of the burrs 351 and 352 to 0.2 mm or more, it is possible to prevent the burrs 351 and 352 from breaking and adhering to other portions of the terminal-attached electric wire 1.

  In the present embodiment, as shown in FIG. 5, the first burr 351 has a radial direction of the crimping portion 30 (more specifically, a center OL in the cross section of the crimping portion 30 and one first apex portion 331. Projecting in a direction substantially perpendicular to the direction (upward direction in FIG. 5). Similarly, the second burr 352 is also in the radial direction of the crimping portion 30 (more specifically, the direction passing through the center OL in the cross section of the crimping portion 30 and the other first apex portion 331). Projecting in a substantially perpendicular direction (upward in FIG. 5).

  Note that the first and second burrs 351 and 352 may protrude downward. Alternatively, the first burr 351 may protrude upward and the second burr 352 may protrude downward. Alternatively, the first burr 351 may protrude downward and the second burr 352 may protrude upward.

  Further, in the present embodiment, since the crimping portion 30 is compressed using the dies 60 and 70 described later, as shown in FIG. 2, a plurality (two in this example) of first burrs 351 are provided. It is formed at one first apex portion 331 in the cross section of the crimping portion 30. Similarly, a plurality (two in this example) of second burrs 352 are formed at the other first apex portion 331 in the cross section of the crimping portion 30. A plurality of first burrs 351 and a plurality of second burrs 352 are alternately formed in the extending direction of the crimping portion 30 (X direction in the drawing).

  The protruding direction of the burr 351, 352 is not particularly limited as long as the burr 351, 352 intersects the radial direction of the crimping part 30, but the desired quality is increased as the burr 351, 352 is inclined toward the crimping part 30 side. Easy to secure. Moreover, the protrusion direction of the burr | flash 351,352 is made into the direction substantially orthogonal to the radial direction of the crimping | compression-bonding part 30, and formation by the metal mold | die 70,80 of the crimping | compression-bonding apparatus 60 mentioned later becomes easy.

  As described above, in this embodiment, the burrs 351 and 352 protrude in a direction intersecting with the radial direction of the crimping portion 30. For this reason, the damage of the surrounding member by the said burr | flash 351,352 can be suppressed, and desired quality can be ensured. Moreover, since the protrusion amount of the burr | flash 351,352 becomes large, so that the compression rate in the crimping | compression-bonding part 30 is large, the crimping | compression-bonding part 30 fully compresses based on the protrusion amount (vertical direction length in FIG. 5). It is possible to control the quality of whether or not the electric wire and the terminal can be securely crimped.

  As an example, as shown in FIG. 6, in order to enhance waterproof performance, the crimped part 30 after crimping is covered with a heat shrinkable tube 51, and a filler 52 is interposed between the crimped part 30 and the heat shrinkable tube 51. May be filled. In this case, the burr 351, 352 can be prevented from coming into contact with the heat shrinkable tube 51 and damaging the heat shrinkable tube 51, so that desired waterproof performance can be ensured. In addition, FIG. 6 is sectional drawing which shows the electric wire with a terminal after the waterproof process in this embodiment.

  Next, the structure of the crimping device used when manufacturing the electric wire 1 with a terminal demonstrated above is demonstrated, referring FIGS. 7-11.

  7 is a perspective view showing a mold of the crimping apparatus according to this embodiment, FIG. 8 is a perspective view showing an upper mold in this embodiment, FIG. 9 is a perspective view showing a lower mold in this embodiment, and FIG. FIG. 11 is a perspective view showing a modification of the upper mold in this embodiment.

  As shown in FIG. 7, the crimping device 60 in this embodiment includes a pair of molds 70, 80 and a press device (not shown) that moves the molds 70, 80 toward and away from each other. . In a state where the crimp part 30 into which the electric wire 10 is inserted is sandwiched between the cavities 72 and 82 of the molds 70 and 80, the crimp part 30 is compressed from above and below by a pressing device, whereby the electric wire 10 and the terminal 20 are connected. The

  The upper side 70 in the present embodiment corresponds to an example of the first mold in the present invention, and the lower mold 80 in the present embodiment corresponds to an example of the second mold in the present invention. , 80 are in contact with each other, and the first and second cavities 72, 82 correspond to an example of the cavities in the present invention.

  As shown in FIG. 8, the upper mold 70 in the present embodiment includes a first cavity 72 and a plurality of (four in this example) first protrusions on a first facing surface 71 that faces the lower mold 80. A portion 73 and a plurality (four in this example) of first recesses 74 are provided.

  On the other hand, as shown in FIG. 9, the lower die 80 also has a second cavity 82 and a plurality of (four in this example) second convex portions 83 on a second facing surface 81 facing the upper die 70. And a plurality (four in this example) of second recesses 84.

  The first cavity 72 and the second cavity 82 have a cross-sectional shape corresponding to the outer shape of the crimping portion 30 of the terminal 20 after compression in a state where the molds 70 and 80 are in contact with each other. Specifically, the first and second cavities 72 and 82 have a substantially hexagonal cross-sectional shape at both end portions in the axial direction, whereas in the central portion in the axial direction, the following It has such a cross-sectional shape.

  In other words, as shown in FIG. 10, the cross-sectional shape of the cavities 72 and 82 includes six apex portions 911 and 912 and six curved portions 92. Each of the apex portions 911 and 912 protrudes in a convex shape toward the radially outer side of the cavities 72 and 82. In addition, the respective curved portions 92 connect the vertex portions 911 and 912 adjacent to each other, and project in a curved shape toward the radially inner side of the cavities 72 and 82. That is, the cross-sectional shape of the cavities 71 and 82 is such that the hexagonal apex is curved in a concave shape.

  Incidentally, the six vertex portions 911 and 912 in the present embodiment include two first vertex portions 911 and four second vertex portions 912. The two first vertex portions 911 are located at both end portions in the cross section of the cavities 72 and 82, and each have a rectangular cross sectional shape. On the other hand, the four second apex portions 912 are located at locations other than the end portions in the cross sections of the cavities 72 and 82, and each have a convexly curved cross sectional shape. The six vertex portions may have the same cross-sectional shape. For example, all the vertex portions may have a curved shape like the second vertex portion 912.

  In the present embodiment, the two first apex portions 911 facing each other coincide with the parting lines PL (see FIG. 7) of the molds 70 and 80. For this reason, undercutting does not occur in the molds 70 and 80.

  As shown in FIG. 8, the upper mold 70 has two first convex portions 73 and two first concave portions 74 on one side (the + Y side in the drawing) with respect to the first cavity 72. The first convex portions 73 and the first concave portions 74 are alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82. Further, the upper mold 70 has two first convex portions 73 and two first concave portions 74 on the other side (the −Y side in the drawing) with respect to the first cavity 72. The first convex portions 73 and the first concave portions 74 are alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82. Further, in the upper mold 70, two first convex portions 73 provided on one side with respect to the first cavity 72 and 2 provided on the other side with respect to the first cavity 72. The first convex portions 73 are alternately arranged in the axial direction (X direction in the drawing) of the cavities 72 and 82, and are arranged in a staggered manner.

  Any of the first protrusions 73 protrudes toward the lower mold 80 from the parting line PL of the molds 70 and 80. In addition, any first convex portion 73 has the first cavity 72 in a direction (Y direction in the drawing) substantially orthogonal to the approach direction (Z direction in the drawing) of the molds 70 and 80. It is provided so that it may adjoin.

  On the other hand, any first recess 74 is recessed from the parting line PL of the molds 70 and 80. In addition, any first concave portion 74 is disposed so as to face the second convex portion 83 so that the second convex portion 83 of the lower mold 80 can be received. The first concave portion 74 is formed relatively wider than the second convex portion 83, and the second convex portion 83 is in a state where the second convex portion 83 enters the first concave portion 74. A gap 741 is formed between the first recess 74 (see FIGS. 10, 13A, and 14B described later). The gap 741 communicates with the first apex 911 of the first cavity 72 and extends in the approaching direction of the molds 70 and 80 (Z direction in the drawing). The gap 741 forms the above-described burrs 351 and 352 of the terminal 20. Note that the gap 741 may have the same depth as the depth of the first recess 74.

  As shown in FIG. 9, the lower mold 80 also has two second protrusions 83 and two on the one side (+ Y side in the figure) with respect to the second cavity 82, as with the upper mold 70. It has the 2nd recessed part 84, and these 2nd convex parts 83 and the 2nd recessed part 84 are alternately arrange | positioned along the axial direction (X direction in a figure) of the cavities 72 and 82. As shown in FIG. . Further, the lower mold 80 has two second convex portions 83 and two second concave portions 84 on the other side (the −Y side in the drawing) with respect to the second cavity 82. The second convex portions 83 and the second concave portions 84 are alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82. Further, in the lower mold 80, a second convex portion 83 provided on one side with respect to the second cavity 82 and two second protrusions provided on the other side with respect to the second cavity 82 are provided. The two convex portions 83 are alternately arranged in the axial direction (X direction in the drawing) of the cavities 72 and 82, and are arranged in a staggered manner.

  Any of the second protrusions 83 protrudes toward the upper mold 70 from the parting line PL of the molds 70 and 80, and is disposed so as to face the first recess 74 of the upper mold 70 described above. ing. In addition, any second convex portion 83 has the second cavity 82 in a direction (Y direction in the drawing) substantially orthogonal to the approach direction (Z direction in the drawing) of the molds 70 and 80. It is provided so that it may adjoin.

  On the other hand, any second recessed portion 84 is recessed from the parting line PL of the molds 70 and 80. In addition, any second concave portion 84 is disposed to face the first convex portion 73 so that the first convex portion 73 of the upper mold 70 can be received.

  As described above, in the present embodiment, the first convex portions 73 and the first concave portions 74 are alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82, and the first The first convex portion 73 provided on one side with respect to the cavity 72 and the first convex portion 73 provided on the other side are the axial directions of the cavities 72 and 82 (X direction in the figure). Are alternately arranged in a zigzag pattern. Similarly, the second convex portions 83 and the second concave portions 84 are alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82, and with respect to the second cavity 82. The first convex portions 83 provided on one side and the first convex portions 83 provided on the other side are alternately arranged in the axial direction (X direction in the figure) of the cavities 72 and 82, and are staggered. Arranged in a shape. For this reason, the upper mold 70 and the lower mold 80 move in two directions (X direction and Y direction in the figure) that are substantially orthogonal to the approach direction (Z direction in the figure) of the molds 70 and 80. Therefore, it is possible to ensure good engagement between the upper mold 70 and the lower mold 80.

  Further, in the present embodiment, since the second recess 84 has substantially the same size as the first protrusion 73, the gap 741 like the first protrusion 74 described above is formed. Not formed. Accordingly, the second recess 84 is also in a direction substantially perpendicular to the approaching direction (Z direction in the drawing) of the molds 70 and 80 (Y direction in the drawing), like the second protrusion 83. ) Is provided adjacent to the second cavity 82.

  In the present embodiment, as described above, the upper mold 70 has the two first convex portions 73 on one side (the + Y side in the drawing) of the first cavity 72 and the first cavity 72. The other first side 72 (-Y side in the figure) also has two first convex portions 73. However, the number of the 1st convex parts 73 which the upper mold | type 70 has is not specifically limited to this. For example, you may comprise the upper mold | type 70B like FIG. FIG. 11 is a perspective view showing a modification of the upper mold in the present embodiment.

  Specifically, as shown in FIG. 11, the upper mold 70B has four first protrusions 73B on one side (the + Y side in the figure) of the first cavity 72, and the first cavity The other first side of 72 (-Y side in the figure) may also have four first convex portions 73B. In this case, although not particularly illustrated, the lower mold also has four second protrusions on one side of the second cavity and four second protrusions on the other side of the second cavity. Part.

  Moreover, both the 1st and 2nd recessed parts 74 and 84 may have a clearance gap. Alternatively, the second recess 84 may have a gap and the first recess 74 may not have a gap. When both the first and second recesses 74 and 84 have a gap, the shape of the upper mold 70 and the shape of the lower mold 80 are the same.

  Next, a procedure for manufacturing the terminal-attached electric wire 1 using the crimping device 60 described above will be described with reference to FIGS.

  12 (a) and 12 (b) are cross-sectional views showing a connection step between the electric wire and the terminal in the present embodiment, and FIG. FIG. 12B is a diagram showing a state in which the electric wire and the terminal are crimped by a mold. 13 (a) is an enlarged view of the XIIIA portion of FIG. 12 (a), FIG. 13 (b) is an enlarged view of the XIIIB portion of FIG. 12 (a), and FIG. 14 (a) is an enlarged view of FIG. 12 (b). FIG. 14B is an enlarged view of the XIVB portion of FIG. 12B.

First, from the end of the wire 10 are stripped insulation layer 13 of a predetermined length L _o, after exposing the twisted wire 11, the end of the stranded wire 11 into the insertion hole 31 of the crimping part 30 of the terminal 20 Insert (see FIG. 3). Next, the crimping portion 30 of the terminal 20 is set in the crimping device 60.

  Specifically, as shown in FIG. 12A, the crimping part 30 is placed on the second cavity 82 of the lower mold 80, and between the upper mold 70 and the lower mold 80 of the crimping part 30. Intervene. At this time, as shown in FIG. 13A, the first upper mold 70 has a first convex portion 73 and a first concave portion 74, and the first concave portion 74 has a gap 741. doing. On the other hand, as shown in FIG. 13B, the lower mold 80 has a second convex portion 83 and a second concave portion 84, and the second concave portion 84 has no gap. .

  When the molds 70 and 80 are brought close to each other by a press device (not shown), the crimping portion 30 of the terminal 20 is compressed inward by the molds 70 and 80 as shown in FIG. The Thereby, the cross-sectional shape of the crimping portion 30 is deformed into an annular shape in which the hexagonal apexes are curved in a concave shape, and the electric wire 10 and the terminal 20 are crimped.

  At this time, as shown in FIG. 14A, the second convex portion 83 of the lower mold 80 enters the first concave portion 74 of the upper mold 70, and accordingly, the end portion in the cross section of the crimping portion 30 is The crimping portion 30 is drawn in a direction substantially perpendicular to the radial direction (Z direction in the drawing). As a result, burrs 351 and 352 projecting in a direction substantially perpendicular to the radial direction of the crimping portion 30 (+ Z direction in the drawing) are formed.

  On the other hand, as shown in FIG. 14B, the first convex portion 73 of the upper mold 70 also enters the second concave portion 84 of the lower mold 80, but the second concave portion 84 does not have a gap. No burr is formed in this portion, and no burr protruding in a direction substantially perpendicular to the radial direction of the crimping portion 30 (the −Z direction in the drawing) is not formed. The first convex portions 73 and the first concave portions 74 are alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82, and the second convex portions 83 and the second concave portions 74. The concave portions 84 are also alternately arranged along the axial direction (X direction in the drawing) of the cavities 72 and 82. For this reason, the burrs 351 and 352 protruding in the direction substantially orthogonal to the radial direction of the crimping portion 30 (the + Z direction in the drawing) are alternately formed in the extending direction of the crimping portion.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, the crimping device 60 for the closed barrel type terminal 20 has been described, but the present invention is not particularly limited thereto.

DESCRIPTION OF SYMBOLS 1 ... Electric wire with a terminal 10 ... Electric wire 11 Stranded wire 12 ... Elementary wire 121 ... Aluminum wire 122 ... Copper coating layer 13 ... Insulating layer 20 ... Terminal 30 ... Crimp part 31 ... Insertion hole 32 ... Inclined surface 331 ... 1st vertex part 332... Second apex portion 34. Bending portion 351, 352... Burr 40... Connection portion 41... First plate portion 42. ... Filler 60 ... Crimping device 70 ... Upper mold 71 ... First opposing surface 72 ... First cavity 73 ... First convex part 74 ... First concave part 741 ... Gap 80 ... Lower mold 81 ... Second opposing part Surface 82 ... second cavity 83 ... second convex portion 84 ... second concave portion 911 ... first vertex portion 912 ... second vertex portion 92 ... curved portion PL ... parting line

Claims (7)

Electric wires,
A terminal-attached electric wire provided with a terminal having a cylindrical crimping portion to which the electric wire is crimped,
The said terminal has a burr | flash protruding in the direction which cross | intersects with respect to the radial direction of the said crimping | compression-bonding part, The electric wire with a terminal characterized by the above-mentioned. It is an electric wire with a terminal according to claim 1,
The crimping part is
A plurality of apex portions respectively projecting radially outward of the crimp portion;
Connecting the apex portions adjacent to each other, and a curved portion protruding in a curved shape toward the radially inner side of the crimping portion;
Has a cross-sectional shape composed of
The burr protrudes from at least one of the two vertex portions facing each other among the plurality of vertex portions. It is an electric wire with a terminal according to claim 1 or 2,
The burr is
A first burr projecting from one end in the cross section of the crimping part;
A second burr projecting from the other end in the cross section of the crimping part,
The electric wire with a terminal, wherein the first burrs and the second burrs are alternately formed in the extending direction of the crimping portion. A crimping device for crimping an electric wire and a terminal,
In a state where the electric wire is inserted into the crimping part of the terminal, the first and second molds for compressing the crimping part from above and below are provided.
At least one of the first and second molds has a protrusion protruding toward at least the other of the second and first molds,
At least the other of the second and first molds has a recess for receiving the protrusion,
The convex portion is adjacent to the cavities of the first and second molds,
At least one of the concave portions is formed relatively wider than the convex portion so that a gap is formed between the convex portion and the concave portion with the convex portion entering the concave portion. And
The crimping apparatus, wherein the gap communicates with the cavity. The crimping device according to claim 4,
The cavity is
A plurality of apexes projecting outward in the radial direction of the cavity;
Connecting the apex portions adjacent to each other, and a curved portion protruding in a curved shape toward the radially inner side of the cavity;
A crimping apparatus characterized by having a cross-sectional shape constituted by: The crimping device according to claim 4 or 5,
The convex portion is
A first protrusion formed on the first mold;
A second convex portion formed on the second mold,
The recess is
A first recess formed in the first mold and receiving the second protrusion;
A second recess formed in the second mold and receiving the first protrusion,
The first convex portion and the first concave portion are alternately formed along the extending direction of the cavity,
The second convex portion and the second concave portion are also alternately formed along the extending direction of the cavity so as to correspond to the first convex portion and the first concave portion. Crimping device. The crimping apparatus according to claim 6,
The first concave portion is formed so that the gap is formed between the second convex portion and the first concave portion with the second convex portion entering the first concave portion. A crimping apparatus, wherein the crimping apparatus is formed wider than the second convex portion.

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