JP2017117724A - Manufacturing method for wire with terminal, crimp jig, and wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with a terminal of which the partial thickness is prevented.SOLUTION: A manufacturing method for a wire with a terminal in which the terminal comprising a bottom plate part and a pair of wire barrels extended to a side direction from the bottom plate part and is crimped to a core wire exposed in an end of the wire the terminal, and a crimp jig, and the manufacturing method includes steps of: mounting the core wire to the bottom plate part; and winding the wire barrels to the core wire by the crimp jig and crimping. The crimp jig comprises: a first jig having a mounting surface to which the bottom plate part and the core wire are mounted; and a second jig having a curvature surface that sandwiches the wire barrels between the mounting surfaces, and thereby being curved. In a region to which the wire barrels are arranged in an extension direction in which the wire extends of the mounting surface, a chevron part of which a central part in the extension direction swelling the bottom plate part is provided. In the region opposite to the chevron part of the curvature surface, a concave part sandwiching the wire barrels along with the chevron part between the chevron parts is provided.SELECTED DRAWING: Figure 4

Description

  The technique disclosed by this specification is related with the manufacturing method of an electric wire with a terminal, a crimping jig, and an electric wire with a terminal.

  Conventionally, the connection between the electric wire and the terminal is performed by crimping a wire barrel provided at the terminal to the core wire exposed at the end of the electric wire. The crimping of the wire barrel to such a core wire is performed by a crimping jig. Specifically, the core wire is superimposed on the wire barrel placed on the base, and the crimping jig is lowered toward the base to wrap the entire wire barrel along the shape of the crimping jig. The tip portion is bitten into the core wire.

JP-A-2005-50736

  However, when the wire barrel is crimped to the core wire using the crimping jig, stress concentrates on the portion of the wire barrel that contacts the end of the crimping jig (the end in the axial direction of the terminal). As shown in the figure, the compressed core wire 100 is pushed upward and the terminal 101 is locally extended, so that a portion 101T that is thinner than the others may be generated.

  An object of the technology disclosed in the present specification is to provide a terminal-attached electric wire in which the terminal is prevented from being partially thinned.

  The technology disclosed in this specification is a wire with a terminal in which a terminal including a bottom plate portion and a pair of wire barrels extending laterally from the bottom plate portion is crimped to a core wire exposed at an end of the wire. The method includes: a step of placing the core wire on the bottom plate portion; and a step of winding the wire barrel around the core wire with a crimping jig and crimping the crimping jig, the crimping jig comprising the bottom plate portion And a first jig having a placement surface on which the core wire is placed, and a second jig having a curved surface that sandwiches and curves the wire barrel between the placement surface, Of the mounting surface of the first jig, a mountain-shaped portion in which a central portion in the extending direction bulges toward the bottom plate portion is provided in a region where the wire barrel is arranged in the extending direction in which the electric wire extends. Of the curved surface of the second jig Serial in a region facing the mountain-shaped portions, wherein the mountain-shaped portions recessed portion pinching the wire barrel along with the chevron portion.

  In the manufacture of a terminal-attached electric wire in which a terminal having a bottom plate portion and a pair of wire barrels extending laterally from the bottom plate portion is crimped to a core wire exposed at an end of the electric wire, the pair of wires A crimping jig for crimping a barrel to the core wire, wherein the wire barrel is bent between the first jig having a placement surface on which the bottom plate portion and the core wire are placed, and the placement surface. A second jig having a curved surface to be provided, and a central portion in the extending direction in a region where the wire barrel is arranged in the extending direction in which the electric wire extends in the mounting surface of the first jig. Is provided in a region facing the chevron part of the curved surface of the second jig, along the chevron part between the chevron part and the chevron part. The recess that sandwiches the wire barrel It has been kicked.

  According to the above method for manufacturing an electric wire with a terminal and a crimping jig, the wire barrel is bent while the central portion in the extending direction of the electric wire is gradually bent by the chevron portion of the mounting surface and the concave portion of the curved surface. Crimped to As a result, stress concentrated on the end portion of the second jig (curved surface) is released in the longitudinal direction of the extending direction, and the terminal is prevented from being partially thinned. Therefore, a high-quality electric wire with a terminal can be provided.

  The chevron is inclined from the placement surface toward the one side from the first inclined surface rising from the placement surface and inclined from the placement surface toward the other side from the one side in the extending direction. It is comprised from the 2nd inclined surface which stands | starts up, and it is preferable that the angle between a 1st inclined surface and a 2nd inclined surface is set larger than 165 degree | times and smaller than 180 degree | times.

  This is because, when the angle is smaller than 165 degrees, the stress applied to the central portion of the wire barrel in the extending direction of the electric wire gradually increases among the stresses released from the both ends of the wire barrel in the front-rear direction.

  In addition, the above-described method for manufacturing a terminal-attached electric wire and the electric wire with a terminal manufactured using a crimping jig are bent in a mountain shape in which the central portion in the wire barrel extending direction of the wire barrel is recessed on the bottom plate side. . Such a terminal-attached electric wire has a high quality because it is avoided that the terminal is partially thinned.

  According to the technology disclosed in this specification, it is possible to provide a terminal-attached electric wire in which a crimping portion to be crimped to the electric wire is avoided from being partially thinned.

The perspective view of the electric wire with a terminal of one embodiment Perspective view of crimping jig Cross section of wire barrel crimped to wire Sectional view in the AA line of FIG. 3 which shows the state which crimps | bonds the wire barrel with the crimping | compression-bonding jig | tool. Sectional view of the wire barrel taken along line AA in FIG. 3 (when θ = 166 degrees) 3 is a cross-sectional view of the wire barrel taken along line AA in FIG. 3 (when θ = 172 degrees). Sectional view of the wire barrel in a state where it is crimped to an electric wire by a conventional crimping jig Cross section of wire barrel

  One embodiment will be described with reference to FIGS. In the following description, the lower left in FIG. 1 is the front, the upper right is the rear, the upper is the upper, and the lower is the lower. Further, the lower right to the upper left in FIG. 1 are defined as the left-right direction (width direction).

(Wire 10 with terminal)
The terminal-attached electric wire 10 of the present embodiment is manufactured by crimping the female terminal 21 to the end of the electric wire 11 using the crimping jig 30. As shown in FIG. 1, the terminal-attached electric wire 10 includes an electric wire 11 and a female terminal 21 that is crimped to the end of the electric wire 11.

(Wire 11)
The electric wire 11 includes a core wire 12 formed by twisting metal thin wires in a spiral shape, and a resin insulating coating 13 that covers the core wire 12. In the terminal portion of the electric wire 11, the insulating coating 13 is stripped and the core wire 12 is exposed. In the present embodiment, the core wire 12 is made of aluminum or aluminum alloy.

(Female terminal 21)
The female terminal 21 is a member manufactured by punching and bending a metal plate material. As a metal plate material used as the material of the female terminal 21, for example, a plate material made of copper or copper alloy and tin-plated on the surface can be used.

  As shown in FIG. 1, the female terminal 21 includes a terminal connection portion 22 that is connected to a counterpart terminal, and a wire connection portion 23 that is crimped to the end of the electric wire 11. The terminal connecting portion 22 is a rectangular cylindrical portion that receives a male tab (not shown) of the counterpart terminal.

  The wire connection portion 23 includes a bottom plate 24 (an example of a bottom plate portion) that is continuous from the terminal connection portion 22, a pair of wire barrels 25 that are continuous from the bottom plate 24, and a pair of insulation barrels 29 that are also continuous from the bottom plate 24. . The bottom plate 24 is an elongated plate-like portion that extends rearward from the rear end of the terminal connection portion 22, and is disposed along the electric wire 11.

  The pair of wire barrels 25 are extended from the bottom plate 24 toward the side (direction intersecting with the extending direction X of the electric wire 11), and surround the core wire 12 exposed from the insulating coating 13 at the end of the electric wire 11. It is a part to be arranged. The pair of wire barrels 25 are arranged to face each other, and are crimped to the core wire 12 so as to crush the core wire 12 with the bottom plate 24.

  The wire barrel 25 in a state of being crimped to the core wire 12 is disposed at the center portion in the front-rear direction and is in close contact with the core wire 12, and the front taper is disposed at the front end portion of the body portion 26 and expands outward. 27 A of part 27A and the back taper part 27B which is distribute | arranged to the rear-end part of the main-body part 26, and expands toward the outer side.

  Each body part 26 of the pair of wire barrels 25 is disposed to face the counterpart body part 26, is curved toward the core wire 12 side so as to approach the counterpart body part 26, and has a tip part (the bottom plate 24 and Is bent inward so that the opposite end) bites into the core wire 12. The tip is abutted with the counterpart tip (see FIG. 3).

  In the present embodiment, the main body portion 26 of the wire barrel 25 that is crimped to the core wire 12 has a mountain shape in which the central portion is bent upward in the extending direction X in which the electric wire 11 extends (the mountain portion). 28). In other words, the central portion in the extending direction X is bent into a mountain shape with the bottom plate 24 side recessed.

  On the other hand, the pair of insulation barrels 29 extend from the bottom plate 24 to the side (in the direction perpendicular to the extending direction X of the electric wires 11) on the rear side of the wire barrel 25, 13 is a part to be crimped to 13.

(Crimping jig 30)
As shown in FIG. 2, the crimping jig 30 includes an anvil 31 (an example of a first jig) and a crimper 41 (an example of a second jig). The anvil 31 is a base on which the female terminal 21 is placed. The crimper 41 is arranged to face the anvil 31, the wire barrel 25 is sandwiched between the anvil 31, and the crimper 41 is crimped to the core wire 12. It is a member to be made.

  The anvil 31 is a metal base, and as shown in FIG. 2, the upper surface thereof is a mounting surface 32 on which the female terminals 21 are mounted.

  In the mounting surface 32, in the region where the wire barrel 25 is arranged in the front-rear direction (extension direction X in which the electric wire 11 extends), the central part in the front-rear direction (extension direction X) bulges upward in a mountain shape. A chevron 33 is provided. The chevron 33 has a flat first inclined surface 33A inclined obliquely upward from the placement surface 32 from the front side to the rear side, and obliquely upward from the placement surface 32 from the rear side to the front side. And a flat second inclined surface 33B. The first inclined surface 33A and the second inclined surface 33B are continuous. The mountain portion 33 is formed over the entire width direction of the placement surface 32.

  The angle θ between the first inclined surface 33A and the second inclined surface 33B is set to an angle larger than 165 degrees and smaller than 180 degrees. In this embodiment, two types of anvils 31 having θ = 166 degrees and 172 degrees are prepared. Note that the lengths in the extending direction X of the first inclined surface 33A and the second inclined surface 33B are the same. In other words, the angle between the mounting surface 32 and the first inclined surface 33A and the angle between the mounting surface 32 and the second inclined surface 33B are the same, and a mountain shape along the extending direction X The longitudinal section of the portion 33 is an isosceles triangle (see FIG. 4).

  On the other hand, as shown in FIG. 2, the crimper 41 is a metal thick plate-like member disposed above the anvil 31 so as to face the anvil 31. The thickness of the crimper (the dimension in the extending direction X of the electric wire) is set to the same dimension as the dimension in the extending direction X of the angled portion 33 of the anvil 31 described above.

  The crimper 41 has a barrel pressing part 42. The barrel pressing portion 42 is a tunnel-like portion extending in the front-rear direction that receives a part of the female terminal 21 and the anvil 31 when the female terminal 21 is crimped to the electric wire 11. The barrel pressing portion 42 is recessed toward the upper side (the side opposite to the anvil 31) with reference to the lower surface 41U arranged in parallel with the mounting surface 32 of the anvil 31.

  The inner wall of the barrel pressing part 42 has a top wall part 43 (an example of a curved surface) and a pair of side wall parts 44.

  The top wall portion 43 is a wall portion that is located away from the lower surface 41U (on the opposite side to the anvil 31). As shown in FIG. 2, the top wall portion 43 has a shape in which two U-shaped grooves 45 extending in the front-rear direction are arranged in parallel in the width direction of the crimper 41 (direction perpendicular to the penetrating direction of the barrel pressing portion 42). ing. A portion sandwiched between the two U-shaped grooves 45 protrudes downward (toward the anvil 31), and forms a protruding portion 46 extending in the front-rear direction.

  As shown in FIG. 2, each of the pair of side wall portions 44 is a wall portion that extends from the edge on the opposite side of the U-shaped groove 45 to the lower surface 41 </ b> U in each U-shaped groove 45. The pair of side wall portions 44 are disposed to face each other.

   The bottom line 47 (the pair of ridge lines arranged at the highest position among the top wall parts 43) along the bottom part of the pair of U-shaped grooves 45 is the above-described mountain-shaped part 33 (the first inclined surface 33A and the second inclined surface 33B). ) To be inclined with respect to the lower surface 41U. More specifically, the bottom line 47 of the U-shaped groove 45 has a first inclined portion 47A inclined obliquely upward from the front side toward the rear side, and obliquely downward toward the rear side connected to the first inclined portion 47A. It is comprised from the 2nd inclination part 47B which inclines to.

  Further, the groove walls of the pair of U-shaped grooves 45 are configured to be bent in a U-shaped cross section from the bottom line 47 in the left-right direction and downward. Of the groove walls of the pair of U-shaped grooves 45, both end edges of the groove wall on the side opposite to the U-shaped groove 45 on the other side are continuous with the side wall portions 44.

  With the above configuration, the bottoms of the pair of U-shaped grooves 45 are formed as recessed portions 48 whose central portions in the front-rear direction (extending direction X) are recessed upward. The recess 48 is formed so as to sandwich the wire barrel 25 along the chevron 33 with the chevron 33.

(Manufacturing method of the electric wire 10 with a terminal)
When the female terminal 21 is crimped to the electric wire 11 using the crimping jig 30, first, the insulating coating 13 at the end portion of the electric wire 11 is peeled off to expose a part of the core wire 12. This electric wire 11 (core wire 12 and insulation coating 13) is arranged extending in the front-rear direction so as to be along the bottom plate 24 of the female terminal 21 (step of placing the core wire 12 on the bottom plate 24).

  Next, the female terminal 21 on which the electric wire 11 is placed is positioned and placed on the placement surface 32 of the anvil 31. That is, the region where the pair of wire barrels 25 is provided in the bottom plate 24 is disposed so as to be disposed on the chevron 33. Each pair of wire barrels 25 has a flat plate shape before being crimped to the electric wire 11 and rises from the bottom plate 24 toward the crimper 41 in a posture facing the wire barrel 25 on the other side.

  Next, the crimper 41 is lowered toward the anvil 31 (wire barrel 25). Then, the pair of wire barrels 25 abut against the side wall portion 44 and the top wall portion 43 of the crimper 41 and gradually bend along the top wall portion 43 from the distal end portion. As the crimper 41 further descends, the tip of the wire barrel 25 changes direction toward the core wire 12 and bites into the core wire 12.

  At this time, since the anvil 31 and the crimper 41 are formed with the chevron 33 and the recess 48, the bottom plate 24 and the pair of wire barrels 25 are bent upwardly as shown in FIG. State.

  In this way, the wire barrel 25 is crimped to the core wire 12 (step of winding the wire barrel 25 around the core wire 12 by the crimping jig 30 to crimp the core).

  FIG. 5 is a cross-sectional view of the wire barrel portion when θ = 165 degrees, and FIG. 6 is a cross-sectional view of the wire barrel portion when θ = 172 degrees. When these are compared with the cross-sectional view of the conventional wire barrel portion shown in FIG. 8, dark portions showing high stress are dispersed in the front-rear direction from the vicinity of the end portion of the crimper 41, and the bottom plate 24 is partially thinned. It can be seen that this is suppressed.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  According to the present embodiment, the wire barrel 25 is gradually bent upward in the extending direction X of the electric wire 11 by the chevron 33 of the placement surface 32 and the recess 48 of the top wall 43. Crimped to the core wire 12. As a result, stress concentrated on the end of the top wall 43 is released in the longitudinal direction in the extending direction X, and the bottom plate 24 of the female terminal 21 is avoided from being partially thinned. Therefore, a high-quality electric wire with a terminal can be provided.

  The angle θ between the first inclined surface 33A and the second inclined surface 33B of the chevron 33 is preferably set to be larger than 165 degrees and smaller than 180 degrees. When the angle θ is smaller than 165 degrees, the stress applied to the central portion of the wire barrel 25 in the extending direction X of the electric wire 11 among the stresses released from the both ends of the wire barrel 25 in the front-rear direction gradually increases. is there.

  Further, the terminal-attached electric wire 10 manufactured using the above-described method of manufacturing the electric wire with terminal and the crimping jig 30 has a region where the core 12 is crimped to the wire barrel 25 and the electric wire 11 of the bottom plate 24. The central portion in the extending direction X is bent into a recessed mountain shape. Such a terminal-attached electric wire 10 is avoided in that the bottom plate 24 of the female terminal 21 is partially thinned, and the quality is high.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope.

  (1) In the above embodiment, the terminal to be crimped to the electric wire 11 is the female terminal 21 having the cylindrical terminal connection portion 22, but is not limited thereto, and may be a male terminal having a male tab, or a metal. A so-called LA terminal in which a through hole is formed in a plate material may be used, and a terminal having an arbitrary shape may be used as necessary.

  (2) In the said embodiment, although the core wire 12 showed the electric wire 11 made from aluminum or aluminum alloy, the electric wire which consists of copper, a copper alloy, or another arbitrary metal may be sufficient as a core wire.

  (3) In the above-described embodiment, the female terminal 21 using a material obtained by performing tin plating on a metal plate made of copper or a copper alloy is shown. However, the present invention is not limited to this. For example, a terminal made of a metal plate made of a metal material such as aluminum or an aluminum alloy may be used. Further, tin may be used as the plating metal, or it may be one that has not been plated.

  (4) In the above embodiment, the case where the angle θ between the first inclined surface 33A and the second inclined surface 33B is 166 degrees and 172 degrees is shown, but the angle θ is not limited to the above embodiment, and is arbitrary. Can be set to any angle.

DESCRIPTION OF SYMBOLS 10 ... Electric wire with terminal 11 ... Electric wire 12 ... Core wire 21 ... Female terminal (terminal)
24 ... Bottom plate (bottom plate)
25 ... Wire barrel 30 ... Crimping jig 31 ... Anvil (first jig)
32 ... Placement surface 33 ... Yamagata 33A ... First inclined surface 33B ... Second inclined surface 41 ... Crimper (second jig)
42 ... Barrel pressing part 43 ... Top wall part (curved surface)
45 ... U-shaped groove 47 ... bottom line 47A ... first inclined portion 47B ... second inclined portion 48 ... recessed portion X ... extending direction

Claims (5)

A method for producing a terminal-attached electric wire in which a terminal having a bottom plate portion and a pair of wire barrels extending laterally from the bottom plate portion is crimped to a core wire exposed at an end of an electric wire,
Placing the core wire on the bottom plate,
Winding the wire barrel around the core wire with a crimping jig, and crimping the wire barrel,
The crimping jig includes a first jig having a placement surface on which the bottom plate portion and the core wire are placed, and a curved surface for bending the wire barrel between the placement surface and the first jig. A second jig,
Of the mounting surface of the first jig, a mountain-shaped portion in which a central portion in the extending direction bulges toward the bottom plate portion is provided in a region where the wire barrel is arranged in the extending direction in which the electric wire extends. And
A terminal-attached electric wire provided with a hollow portion that sandwiches the wire barrel along the chevron portion in the region facing the chevron portion of the curved surface of the second jig. Manufacturing method. The chevron is inclined from the placement surface toward the one side from the first inclined surface rising from the placement surface and inclined from the placement surface toward the other side from the one side in the extending direction. The second inclined surface that rises, and an angle between the first inclined surface and the second inclined surface is set to be larger than 165 degrees and smaller than 180 degrees. Of manufacturing electric wires with terminals. In the manufacture of an electric wire with a terminal in which a terminal having a bottom plate portion and a pair of wire barrels extending laterally from the bottom plate portion is crimped to a core wire exposed at an end of the electric wire, the pair of wire barrels is A crimping jig for crimping the core wire,
A first jig having a placement surface on which the bottom plate portion and the core wire are placed; and a second jig having a curved surface that curves the wire barrel between the placement surface,
Of the mounting surface of the first jig, a mountain-shaped portion in which a central portion in the extending direction bulges toward the bottom plate portion is provided in a region where the wire barrel is arranged in the extending direction in which the electric wire extends. And
A crimping jig in which a concave portion for sandwiching the wire barrel along the chevron is provided in a region facing the chevron in the curved surface of the second jig. . The chevron is inclined from the placement surface toward the one side from the first inclined surface rising from the placement surface and inclined from the placement surface toward the other side from the one side in the extending direction. The second inclined surface that rises, and an angle between the first inclined surface and the second inclined surface is set to be larger than 165 degrees and smaller than 180 degrees. Crimping jig. A terminal-attached electric wire to which a terminal having a bottom plate portion and a pair of wire barrels extending laterally from the bottom plate portion is crimped to the core wire exposed at the end of the electric wire,
The core wire disposed on the bottom plate portion is crimped in a state where the pair of wire barrels are wound,
The electric wire with a terminal in which the center part in the extension direction of the electric wire of the wire barrel is bent into a mountain shape in which the bottom plate part side is depressed.

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