JP5495200B2 - Wire crimping device - Google Patents

Description

  The present invention relates to an electric wire crimping apparatus for caulking and connecting a core wire of an electric wire to a core wire crimping portion provided on a connection terminal so that energization is possible.

  In recent years, aluminum wires, aluminum alloy wires, and the like have been used to reduce the size and weight of vehicles and the like. However, these aluminum-based electric wires easily form an aluminum oxide film on the surface, and without removing this, when the connection terminals are crimped and connected with the terminal crimping device described in Patent Documents 1 and 2, In some cases, good electrical contact could not be obtained.

Various proposals have been made in order to solve the above problems, and a terminal connection method disclosed in Patent Document 3 will be described as an example.
That is, the electric wire 50 shown in FIG. 12 has a configuration in which the outer periphery of a core wire 51 formed by twisting a plurality of metal strands is covered with a jacket 52 made of an insulating synthetic resin.

  On the other hand, the connection terminal 53 is formed by bending a metal plate-like member, and includes a connection portion 54, a substrate portion 55, core wire crimping portions 56a and 56b, jacket crimping portions 57a and 57b, and the like. . The connecting portion 54 is formed in a substantially rectangular tube shape, and a mating connector (not shown) is inserted therein. The inserted mating connector comes into contact with the elastic contact piece 58 provided in the connecting portion 54, and both are connected so as to be electrically conductive.

  The board portion 55 extends from the rear end portion of the connection portion 54. A pair of core wire crimping portions 56a and 56b for caulking the core wire 51 of the electric wire 50 are erected on the left and right sides of the intermediate portion of the substrate portion 55 so as to face upward. Further, on both the left and right sides of the rear end portion of the board portion 55, outer crimping portions 57a and 57b for crimping and fixing the outer sheath 52 of the electric wire 50 are provided facing upward.

  The core wire side crimper 60 and the core wire side anvil 61 are connection jigs for caulking and connecting the core wire 51 exposed at the terminal portion of the electric wire 50 to the connection terminal 53. The core wire side crimper 60 is for pressing the core wire crimping portions 56a, 56b from above, and a caulking tooth mold 62 is formed on the lower end surface thereof.

  When the connection terminal 53 is sandwiched between the tooth mold 62 and the core wire side anvil 61, the tips of the core wire crimping portions 56a and 56b are guided inward, and the core wire crimping portions 56a and 56b are guided in the direction of the core wire 51. Two curved surface portions 63a and 63b are formed to face the surface.

  As shown in FIGS. 12 to 14, the two curved surface portions 63 a and 63 b are formed in a target shape, and the boundary portion X between the two curved surface portions 63 a and 63 b is formed in a straight line having no height difference, that is, having no inclination. ing.

  On the other hand, the core wire side anvil 61 is for supporting the connection terminal 53 from below at the time of crimping, and the upper end surface of the core wire side anvil 61 after crimping of the substrate portion 55 between the core wire crimping portions 56a and 56b. A curved portion 63 that matches the curvature is formed.

  The jacket side crimper 64 is used to crimp the jacket crimping portions 57a and 57b in cooperation with the jacket side anvil 65, and a tooth mold 66 is also formed below the jacket side crimper 64. ing. On the upper surface of the jacket side anvil 65, a curved portion 67 is formed in accordance with the curvature of the substrate portion 55 after crimping.

  When the electric wire 50 is connected to the connection terminal 53, the jacket 52 is peeled off at the end of the electric wire 50 to expose the core wire 51. Then, as shown in FIG. 12, the exposed core wire 51 is positioned between the core wire crimping portions 56a and 56b, and the portion covered with the jacket 52 is positioned between the jacket tightening portions 57a and 57b.

  Hereinafter, the caulking of the core wire 51 will be described. As shown in FIG. 13, the core wire caulking portions 56 a and 56 b are positioned between the core wire crimper 60 and the core wire anvil 61. In this state, the core wire side crimper 60 is lowered to bend and deform the core wire crimping portions 56a and 56b inward, and the core wire 51 is crimped and connected to the core wire crimping portions 56a and 56b, that is, to the connection terminal 53.

  At this time, ultrasonic vibration is applied between the core wire-side crimper 60 and the core wire-side anvil 61 by the ultrasonic vibration means 68, and caulking connection is performed while removing the oxide film on the core wire 51.

Japanese Patent Laid-Open No. 7-14658 Japanese Patent Laid-Open No. 7-50191 JP 2003-217784 A

However, according to the study of the present inventor, a new problem has been clarified regarding the caulking connection of the aluminum-based electric wire.
In other words, for example, when the connection terminal is plated with tin plating or the like and the aluminum wire is crimped and connected, the tin plating is adhered to the surface of the aluminum wire to improve conductivity. It turns out to get.

However, in the devices described in Patent Documents 1 to 3, the pressing portion in the core wire crimping portion is flat along the longitudinal direction of the core wire, and the entire core wire crimping portion is uniformly pressed in the longitudinal direction. Therefore, it is not possible to reliably adhere the tin plating applied to the core wire crimping portion to the surface of the aluminum electric wire.
In addition, since the ultrasonic vibration means is necessary, the entire configuration is complicated.

  The object of the present invention is to solve the above-mentioned problems, and when the core wire crimping portion provided on the connection terminal is pressed by the crimper and fixed to the core wire, the connection terminal and the core wire are securely adhered. It is an object of the present invention to provide an electric wire crimping apparatus configured to improve electrical conductivity.

The above object of the present invention is achieved by the following configurations.
(1) An anvil for mounting and positioning a connection terminal having a core wire crimping portion formed by opposingly forming a pair of crimping pieces with a desired interval on a conductive substrate;
Two pressing surfaces having curved surfaces for bending and deforming the pair of crimping pieces in a direction facing each other, pressing the core wire crimping portion of the connection terminal positioned on the anvil to A crimper which is exposed from a terminal portion and fixed to a core wire positioned between the crimping pieces and fixed in parallel with respect to the anvil ;
A wire crimping device comprising:
The core wire is an aluminum electric wire, an electric wire made of an aluminum alloy, or a composite electric wire in which these are combined, and the core wire caulking portion is tin-plated,
In the pressing surface of the crimper, an edge of a cross section along the longitudinal direction of the core wire is inclined with respect to the longitudinal direction, and the pressing surface of the crimper is both ends from the central portion in the longitudinal direction. Having an incline or descent slope towards
The bottom surface of the anvil does not have an inclined portion similar to the inclined portion,
When the core crimping portion is pressed by the crimper, a component force acting in the longitudinal direction is generated by the pressing force of the pressing surface.

  According to the configuration of (1), the pressing surface of the crimper has an edge of a cross section along the longitudinal direction of the core wire inclined with respect to the longitudinal direction, and the core wire caulking by the crimper. When pressing the part, a component force acting in the longitudinal direction is generated by the pressing force of the pressing surface, so that the core wire crimping part and the core wire are rubbed closely, and the core wire crimping part and the core wire are Securely adheres.

Moreover, according to the structure of said (1) , even if a core wire is an aluminum-type metal, a core wire and a core wire crimping part can be made to adhere reliably and electroconductivity can be improved. Moreover, the adhesion promotion to the core wire which tin-plated the core wire crimping part improves.

  According to the wire crimping apparatus of the present invention, the pressing surface of the crimper has an edge of a cross section along the longitudinal direction of the core wire inclined with respect to the longitudinal direction, and the core wire is added by the crimper. When pressing the tightening portion, a component force acting in the longitudinal direction is generated by the pressing force by the pressing surface, so that the core wire crimping portion and the core wire are rubbed closely, and the core wire crimping portion and the core wire Surely adheres. And, when an aluminum-based electric wire is applied as the core wire and tin plating or the like is applied to the core wire crimping portion, adhesion to the plating core wire is promoted by rubbing, and the aluminum-based electric wire and the core wire crimping portion, That is, the electrical conductivity between the connecting terminal provided with the core wire crimping portion is improved and the contact reliability is improved.

It is a side view which shows the structure of the crimping | compression-bonding apparatus of the electric wire which is embodiment of this invention. It is a side view of the crimping | compression-bonding apparatus of the electric wire which shows the crimping form of an electric wire. It is a perspective view which shows 1st Embodiment of a core wire side crimper. It is sectional drawing of the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. (A) is a schematic diagram which shows the effect | action of the conventional core side crimper, (B) is a perspective view which shows the effect | action of the core side crimper of embodiment of this invention. It is a perspective view which shows the reference example of a core side side crimper. It is the EE sectional view taken on the line of FIG. It is sectional drawing which shows 2nd Embodiment of a core side crimper. It is a disassembled perspective view which shows the connection method of the conventional electric wire. It is sectional drawing which shows the crimping form of an electric wire. It is a perspective view which shows the form of a core side crimper.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a wire crimping apparatus according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the wire crimping device 1 according to the present embodiment includes a support portion 7 that supports the connection portion 5 provided on the connection terminal 3 from below, a core crimping portion 9 provided on the connection terminal 3, and a jacket. A support part 15 that supports the caulking part 11 integrally with the substrate part 13 from below, a holding part 17 that holds the connecting part 5 from above, a core side crimper 19 that caulks the core wire caulking part 9, and the outer cover An outer cover side crimper 21 for caulking the caulking part 11, a cutter part 23 for cutting extra portions such as a connecting part of the connection terminal 3, and the like are provided.

  When the electric wire 25 is crimped and connected to the connection terminal 3 by the electric wire crimping device 1, the outer sheath 27 is peeled off at the end of the electric wire 25 and the core wire 31 is exposed in the core wire crimping portion 9 as in the prior art. Position it. Further, the portion covered with the outer cover 27 is positioned in the outer cover crimping portion 11.

In addition, both the core wire crimping portion 9 and the outer sheath crimping portion 11 are formed by facing a pair of crimping pieces facing upward as in the prior art, and the positioning form of the core wire 31 and the outer sheath 27 is as follows. It may be the same as that shown in FIG.
The entire surface of the connection terminal 3 as well as the core wire crimping portion 9 is plated with tin in order to improve conductivity and prevent rust.

  In the state where the core wire 31 is positioned in the core crimping portion 9 and the jacket 27 is positioned in the jacket crimping portion 11 as described above, the connection terminal 3 is positioned on the support portions 7 and 15 as shown in FIG. Then, the holding portion 17 is lowered to fix the connecting portion 5. Next, the core wire side crimper 19 and the jacket side crimper 21 are lowered, the core wire crimping portion 9 and the jacket crimping portion 11 are plastically deformed, and the core wire 29 is crimped to the core wire crimping portion 9 and fixed. The electric wire 10 is caulked and fixed to the jacket caulking portion 11.

After the tightening operation is finished, the cutter unit 23 is driven to cut off the extra portion 3a such as the connecting portion of the connection terminal 3, and the connection terminals 3 are separated.
The pressing surface of the core wire side crimper 19 is such that the edge of the cross section along the longitudinal direction of the core wire 29 is inclined with respect to the longitudinal direction, and the core wire crimper 19 presses the core wire crimping portion 9. The component force acting in the longitudinal direction is generated by the pressing force by the pressing surface. As the said core side crimper 19, the thing of various structures as shown in the following embodiment is applied.

1st Embodiment The core side crimper 19 in this embodiment is provided with the tooth type | mold 31 in the lower end surface as shown in FIG. 3, and the tooth type | mold 31 is provided with two curved surface parts 33a and 33b. As shown in FIGS. 3 to 7, the boundary Y of the two curved surface portions 33 a and 33 b is formed such that the central portion in the longitudinal direction of the core wire 29 has a pointed shape. First upward inclined portions 35a and 35b are formed in the direction along the direction.

  Further, as shown in FIGS. 3, 5, 6, and 7, the second inclined portion is formed as an arcuate ridge line portion in a direction orthogonal to the longitudinal direction of the core wire crimping portion 9 during the caulking. 37a and 37b are formed.

  Accordingly, when the core wire crimper 19 is lowered and the core wire crimping portion 9 is pressed as described above, the core wire crimping portion 9 is plastically deformed inward by the curved surface portions 33a and 33b, but the second inclined portions 37a and 37b are The core wire caulking portion 9 that has undergone plastic deformation is bitten. Therefore, in the horizontal direction orthogonal to the longitudinal direction of the core wire crimping portion 9, the horizontal direction corresponding to the pressing force F from above by the core wire side crimper 19 and the bending degree of the second inclined portions 37a and 37b (FIG. 4). A pressing force which is a component force in the direction perpendicular to the paper surface is applied. As a result, the core wire 29 and the core wire crimping portion 9 rub against each other, and adhesion between the core wire crimping portion 9 whose surface is plated with tin and the core wire 29 is promoted, and the core gland crimping portion 9 and the core wire 29 are The electrical conductivity between is improved.

  Moreover, about the longitudinal direction of the core wire crimping part 9, the core line side crimper 19 is lowered to correspond to the pressing force F from above and the inclination angles of the first inclined parts 35a and 35b as shown in FIG. A pressing force f which is a component force on both sides in the horizontal direction is applied. As a result, the core wire 29 and the core wire crimping portion 9 rub against each other, and adhesion between the core wire crimping portion 9 and the core wire 29, for example, tin-plated on the surface is promoted, and the core gland crimping portion 9 and the core wire 29 are promoted. The conductivity between the two is improved.

  Here, the caulking action according to the prior art and the action according to the above embodiment are schematically shown in FIG. Conventionally, the caulking is performed only by the pressing force from above. However, according to the above embodiment, a horizontal component force is generated in the pressing force from above. As shown in FIG. Thus, it is pressed obliquely downward to be caulked.

Reference Example The core wire side crimper 19 in this reference example is formed in an inclined portion 39 in which the boundary portion Y of the curved surface portions 33a and 33b is inclined in one direction as shown in FIGS.

  According to this configuration, when the core wire side crimper 19 is lowered as described above, the core wire crimping portion 9 is crimped by the curved surface portions 33a and 33b, and the vertical direction is along the longitudinal direction of the core wire crimping portion 9. And a pressing force f in one horizontal direction corresponding to the inclination angle of the inclined portion 39 are applied.

  As a result, the core wire crimping portion 9 and the core wire 29 rub against each other, and adhesion between the core wire crimping portion 9 whose surface is plated with tin and the core wire 29 is promoted, and the conductivity between the two is improved. . In addition, the inclination direction of the inclination part 39 is not limited to the direction of illustration, You may incline in the direction shown by the imaginary line in FIG.

Second Embodiment In the present embodiment, as shown in FIG. 11, the first inclined portion 41a and the second inclined portion are inclined downward from the longitudinal central portion of the core wire 29 of the core wire side crimper 19 toward both ends. 41b. The formation direction of the first and second inclined portions 41 a and 41 b may be a direction along the longitudinal direction of the core wire crimping portion 9.

As shown in the above embodiments and reference examples , by forming the inclined portions 35a, 35b, 39, 41a, and 41b on the pressing surface of the core wire side crimper 19, the pressing force F due to the lowering of the core wire side crimper 19 and The core wire crimping portion 9 can be crimped by the longitudinal force f of the core wire 26 of the pressing force F, whereby the core wire crimping portion 9 and the core wire 29 are rubbed well. And adhesion with the core wire crimping part 9 by which the tin plating was given to the surface and the core wire 29 is accelerated | stimulated, and the electrical conductivity improvement between both and the improvement of contact reliability can be aimed at.

  The present invention is not limited to the above-described embodiments, and can be appropriately modified and improved. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

For example, the inclined portions 41a and 41b shown in the second embodiment may be formed in the intersecting direction as in the first embodiment.
Moreover, the kind of core wire is not limited to the said embodiment, The kind of plating is not limited to the tin plating of the said embodiment, The core wire which gave nickel plating and zinc plating may be sufficient.

DESCRIPTION OF SYMBOLS 1 Wire crimping apparatus 3 Connection terminal 5 Connection part 7 Support part 9 Core wire crimping part 11 Outer crimping part 13 Substrate part 15 Support part 17 Holding part 19 Core wire side crimper 21 Outer side crimper 23 Cutter part 25 Electric wire 27 Outside 29 core wire 31 tooth mold 33 curved surface portion 35, 41a first inclined portion 39, 41b second inclined portion Y boundary portion

Claims (1)

An anvil for placing and positioning a connection terminal having a core wire crimping portion formed by opposingly forming a pair of crimping pieces on a substrate having conductivity through a desired interval;
Two pressing surfaces having curved surfaces for bending and deforming the pair of crimping pieces in a direction facing each other, pressing the core wire crimping portion of the connection terminal positioned on the anvil to A crimper which is exposed from a terminal portion and fixed to a core wire positioned between the crimping pieces and fixed in parallel with respect to the anvil ;
A wire crimping device comprising:
The core wire is an aluminum electric wire, an electric wire made of an aluminum alloy, or a composite electric wire in which these are combined, and the core wire caulking portion is tin-plated,
In the pressing surface of the crimper, an edge of a cross section along the longitudinal direction of the core wire is inclined with respect to the longitudinal direction, and the pressing surface of the crimper is both ends from the central portion in the longitudinal direction. Having an incline or descent slope towards
The bottom surface of the anvil does not have an inclined portion similar to the inclined portion,
When the core crimping portion is pressed by the crimper, a component force acting in the longitudinal direction is generated by the pressing force of the pressing surface.

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