JP2018022642A - Method of manufacturing terminal crimping wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a terminal crimping wire, capable of preventing reliability of electrical connection by peeling off plating of a crimping terminal crimped to the wire.SOLUTION: There is provided a method of manufacturing a terminal crimping wire in which a crimping terminal 30 is crimped to a wire 20. The crimping terminal has a pair of crimping pieces 33b and 33b in which a tapered part 33c is provided at a tip 33d and plating P is formed on a surface 30d by applying the plating P to a base material 30a. This method includes a current applying step of applying current for energizing between one end 30b and the other end 30c of the crimping terminal 30 so that heat is added to the crimping terminal 30 at a temperature or more for melting the plating P and at less than the temperature for melting the base material 30a after forming the tapered part 33c in the crimping terminal 30.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing a terminal crimped electric wire in which a crimp terminal is crimped to an electric wire.

  Conventionally, in a terminal crimped electric wire, the conductor portion of the electric wire and the crimp terminal are electrically connected by crimping the crimp terminal to the conductor portion exposed at the terminal portion of the electric wire.

  For example, Patent Literature 1 includes a crimping portion that is crimped to a terminal portion of an electric wire, a mating connection portion that is connected to a connection partner of the electric wire, a crimping portion, and a connecting portion that connects the mating connection portion. In the terminal, the connecting part has a structure that is not easily affected by the deformation of the crimping part, and the deformation of the mating connection part connected to the joining part is prevented, thereby preventing the electrical connection stability with the connection partner from being lowered. Terminals are listed.

  In Patent Document 2, one electrode is brought into contact with a conductor portion of an electric wire, the other electrode is brought into contact with a crimp portion of a crimp terminal, and a current is passed between both electrodes to weld the conductor portion and the crimp portion. A method for manufacturing a terminal crimped electric wire is described in which the connection strength between the conductor portion of the electric wire and the crimp terminal is increased by connecting.

By the way, the crimp terminal is generally formed by subjecting a plate-like metal member obtained by plating copper or a copper alloy with tin or the like to a pressing step and a bending step.
In addition, a tapered portion is formed at the tip of the pair of crimping pieces of the crimp terminal, and the tip of each crimping piece enters the conductor portion of the electric wire by the taper portion, so that the crimp terminal is securely crimped to the conductor portion. As a result, the electrical connection performance is improved.

JP, 2015-207436, A JP-A-9-161936

  However, after the punching process (see FIG. 8 (b)) as the pressing process for the plate-shaped metal member B (see FIG. 8 (a)) before being formed into the crimp terminal, the taper molding is also performed as the pressing process. When the step (see FIG. 8C) is performed, in the taper forming step, the plating P is pressed by the taper forming jig A and moves along the taper portion T, and fine plating strips P1 are formed as burrs on the taper portion T. If the plating strip P1 is peeled off from the crimp terminal 30 (see FIG. 9B), the stripped strip P1 is removed from the terminal of the connector housing 100, for example (see FIG. 8D). There is a possibility that the reliability of electrical connection may be deteriorated by being mixed in the connection portion between the crimp terminal 30 accommodated in the accommodation chamber 110 and the mating connection terminal C (see FIG. 9C).

  This invention is made in view of the above, Comprising: The manufacturing method of the terminal crimping electric wire which can prevent the reliability of an electrical connection falling by peeling of the plating of the crimping terminal crimped to an electric wire is provided. The purpose is to do.

  In order to solve the above-described problems and achieve the object, a method for manufacturing a terminal crimped electric wire according to claim 1 of the present invention includes a pair of crimping pieces each having a tapered portion at a tip, and a base. In the manufacturing method of a terminal crimping electric wire, in which a crimping terminal formed by plating on a material is crimped to an electric wire, the plating is performed after forming the tapered portion on the crimping terminal. Including a current application step of applying a current for energizing between one end and the other end of the crimp terminal so that heat is applied to the crimp terminal at a temperature equal to or higher than a melting temperature and lower than a temperature at which the base material melts. It is characterized by that.

  Moreover, the manufacturing method of the terminal crimping electric wire which concerns on Claim 2 of this invention is a plate shape used as the raw material of the said crimping terminal by which the said electric current application process performed the said plating with respect to the said base material in said invention. A pressing step in which the metal member includes the formation of the tapered portion, and a bending step is applied to the shape of the crimp terminal before the crimping to the electric wire after the pressing step, and the plurality of crimp terminals are at one end Are connected to each crimping terminal in a state of being connected by a connecting portion, and a current for applying current between one end and the other end is applied.

  In the method for manufacturing a terminal crimped electric wire according to claim 1 of the present invention, after forming the tapered portion on the crimp terminal, the current melt is performed at a temperature equal to or higher than the temperature at which the plating melts and the base material melts. In order to apply a current that energizes between one end and the other end of the crimp terminal so that heat is applied to the crimp terminal at a temperature lower than the temperature, the heat at a temperature at which the plating is melted over the entire crimp terminal. In addition, when the plating strip generated in the tapered portion is melted, the plating strip becomes a smooth surface state equivalent to the plating around the plating strip and disappears. It is possible to prevent the reliability of electrical connection from being lowered due to the plating of the crimp terminal being peeled off.

  In the method for producing a terminal crimped electric wire according to claim 2 of the present invention, a pressing step in which a plate-like metal member that is a raw material of the crimp terminal subjected to the plating on the base material includes forming the tapered portion, And after the pressing step, a bending step is applied to the shape of the crimp terminal before being crimped to the electric wire, and a plurality of the crimp terminals are connected to each crimp terminal in a state where one end is connected by a connecting portion. Since a current for energizing between one end and the other end is applied, it is easy to continuously apply the current application step to each crimp terminal of the plurality of crimp terminals. As a result, the current application step Can be easily automated.

FIG. 1 is an exploded perspective view of a terminal crimped electric wire manufactured by the method for manufacturing a terminal crimped electric wire according to the present invention. FIG. 2 is a perspective view of a terminal crimped electric wire manufactured by the method for manufacturing a terminal crimped electric wire according to the first embodiment of the present invention. FIG. 3 is a view for explaining the terminal crimped electric wire in a state where the crimp terminal is accommodated in the terminal accommodating chamber of the connector housing. FIG. 4 is a diagram showing a state in which a current is applied by a current application device as a current application process to a crimp terminal subjected to a pressing process and a bending process on a plate-like metal member by a press / bending machine. It is. FIG. 5 is an enlarged view showing the periphery of the crimp terminal to which a current is applied among the plurality of crimp terminals shown in FIG. 4. FIG. 6 is a diagram for explaining the flow of a terminal crimping process in which a crimp terminal is crimped to an electric wire. FIG. 7: is the figure which showed a mode that an electric current application process was performed with respect to the manufacturing method of the terminal crimping electric wire which concerns on Example 2 of this invention with respect to the crimping terminal of the state by which crimping was completed to the electric wire. FIG. 8 is a diagram for explaining the problems of the prior art. FIG. 9 is a diagram for explaining the problems of the prior art.

  Hereinafter, with reference to drawings, the suitable Example of the manufacturing method of the terminal crimping electric wire which concerns on this invention is described in detail.

FIG. 1 is an exploded perspective view of a terminal crimped electric wire 10 manufactured by the method for manufacturing a terminal crimped electric wire according to Embodiment 1 of the present invention. FIG. 2 is a perspective view of the terminal crimped electric wire 10 manufactured by the method for manufacturing a terminal crimped electric wire according to the first embodiment of the present invention. FIG. 3 is a view for explaining the terminal crimped electric wire 10 in a state in which the crimp terminal 30 is accommodated in the terminal accommodating chamber 110 of the connector housing 100.
The method for manufacturing a terminal crimped electric wire according to the first embodiment of the present invention is a method for manufacturing a terminal crimped electric wire in which the crimp terminal 30 is crimped to the electric wire 20.

First, the terminal crimped electric wire 10 will be described.
In the terminal crimped electric wire 10, the conductor portion 21 of the electric wire 20 and the crimp terminal 30 are electrically connected by crimping the crimp terminal 30 to the conductor portion 21 exposed at the terminal portion of the electric wire 20.

The electric wire 20 includes a conductor portion 21 and an insulating coating portion 22 that surrounds the outer periphery of the conductor portion 21.
The conductor portion 21 is formed by bundling a plurality of strands 21a made of a conductive wire such as aluminum, aluminum alloy, copper, or copper alloy.
In the first embodiment, the conductor portion 21 is exemplified by a bundle of a plurality of strands 21a. However, the conductor portion 21 is not limited to this and may be a single core wire.
The insulation coating portion 22 is made of an insulating synthetic resin, and is formed so as to surround the outer periphery of the conductor portion 21, thereby protecting the conductor portion 21 from the outside so as to be insulated.
The terminal portion of the electric wire 20 is in a state where the conductor portion 21 is exposed by peeling off the insulating coating portion 22. A crimping terminal 33 (described later) of the crimp terminal 30 is crimped to the exposed conductor part 21 so that the crimp terminal 30 is electrically connected to the electric wire 20.

The crimping terminal 30 has a pair of crimping pieces 33b and 33b each having a tapered portion 33c at the tip 33d, and plating P is formed on the surface 30d by plating the base material 30a. It becomes.
The crimp terminal 30 is formed by applying a plate-like metal member B in which a base material 30a made of copper, a copper alloy, or the like is tin-plated, or a nickel base is tin-plated or the like to a pressing process or a bending process. Are formed into a predetermined shape.
The crimp terminal 30 includes a mating terminal connection part 31 that is a part to be connected to a connection partner (not shown), and a crimping part 32 that is crimped to the terminal part of the electric wire 20.

The mating terminal connecting portion 31 is configured such that the mating terminal C is brought into contact with an elastic contact piece 31b provided in a cylinder of the connecting body portion 31a having a rectangular tube shape (see FIG. 3). The mating terminal connecting portion 31 constitutes a female terminal to which a male terminal as the connecting mating terminal C is connected.
Further, the mating terminal connecting portion 31 is locked in the terminal accommodating chamber 110 of the connector housing 100 by a locking projection 31c protruding from the surface of the connection main body portion 31a.
In addition, although the other party terminal connection part 31 illustrated what comprises a female terminal, as long as it is the structure which can be connected to the other party terminal C, it may be another terminal structure.

The crimping part 32 is provided in two places spaced apart in the extending direction of the electric wire 20.
One crimping portion 32 is a conductor crimping portion 33 that is crimped to the exposed conductor portion 21 of the electric wire 20, and the other crimping portion 32 is a coated crimping portion 34 that is crimped to the insulating coating portion 22 of the electric wire 20. It is. The conductor crimping part 33 and the covering crimping part 34 are connected by an intermediate part 35.
Further, the conductor crimping portion 33 is connected to the mating terminal connecting portion 31 by the connecting portion 36.
The conductor crimping part 33, the intermediate part 35, and the covering crimping part 34 are connected to each other so that the bottom walls 33a, 34a, and 35a are continuous along the extending direction of the electric wire 20.

The conductor crimping portion 33 includes a bottom wall 33a and a pair of crimping pieces 33b and 33b erected on both edges of the bottom wall 33a.
A tapered portion 33c is provided at the distal end portion 33d of each crimping piece 33b, 33b, and the tapered portion 33c makes it easier for the distal end portion 33d of each crimping piece 33b, 33b to enter the conductor portion 21 of the electric wire 20, and the conductor crimping portion. The electrical connection performance is improved by reliably pressing 33 to the conductor portion 21.

  The covering crimping portion 34 includes a bottom wall 34a and a pair of crimping pieces 34b and 34b provided upright on both edges of the bottom wall 34a.

Such a crimp terminal 30 is formed into a predetermined shape by subjecting the plate-shaped metal member B to a pressing process and a bending process.
More specifically, the crimp terminal 30 is subjected to a taper forming process after the punching process as a general pressing process described above.
Therefore, in the taper forming process, the plating P is pressed by the jig A, and the plating P is moved along the taper portion 33c together with the formation of the taper portion 33c. Occur.

The crimp terminal 30 is in a state as shown in FIG. 1 by performing a bending process after the pressing process.
That is, the crimp terminal 30 subjected to the bending process is in a state where the conductor crimping portion 33 and the covering crimping portion 34 are bent in a substantially U shape with the tip ends of the pair of crimping pieces 33b and 34b open. Yes.

Next, the manufacturing method of a terminal crimping electric wire is demonstrated in detail using FIGS.
FIG. 4 shows a state in which a current is applied by the current application device 200 as a current application process to the crimping terminal 30 subjected to the pressing process and the bending process on the plate-like metal member B by the press / bending machine 400. FIG. FIG. 5 is an enlarged view showing the periphery of the crimp terminal 30 to which a current is applied among the plurality of crimp terminals 30 shown in FIG. 4. FIG. 6 is a diagram for explaining a flow of a terminal crimping process in which the crimp terminal 30 is crimped to the electric wire 20.
Note that the press / bending machine 400 shown in FIG. 4 includes the pressing step described above for the plate-like metal member B that is the raw material of the crimp terminal 30 plated with the base material 30a, and It is an apparatus which performs a bending process.

A plurality of crimp terminals 30 subjected to the pressing process and the folding process are continuously sent out from the press / bending machine by the press / bending machine 400 with respect to the plate-shaped metal member B which is a raw material of the crimp terminal 30. (See FIG. 4).
Here, the plurality of crimp terminals 30 are in a state where the one end 30b side is connected by the connecting portion B1.
More specifically, in the plurality of crimp terminals 30, the connection portions B <b> 1 corresponding to the respective crimp terminals 30 are connected to the band-shaped carrier portion B <b> 2 and are connected by the carrier portions B <b> 2 and the connection portions B <b> 1. ing.
The plurality of crimp terminals 30 are continuously fed out from the press / bending machine 400 by the carrier portion B2 being pulled out in the feeding direction of the crimp terminal 30 from the press / bending machine 400.

In this way, a current application step is performed on each crimp terminal 30 continuously fed from the press / bending machine 400 (see FIGS. 4 and 5).
In the current application step, after the tapered portion 33c is formed on the crimp terminal 30, the crimp terminal 30 is heated so that heat is applied to the crimp terminal 30 at a temperature equal to or higher than the temperature at which the plating P melts and lower than the temperature at which the base material 30a melts. This is a step of applying a current for energizing between one end 30b and the other end 30c.
More specifically, the current application step uses the current application device 200 to bring current-carrying probes 210 and 210 of different electrodes into contact with both ends of the crimp terminal 30, so that one end 30 b and the other end 30 c of the crimp terminal 30 And applying heat to the entire crimp terminal 30 according to the value of the applied current.
The current value applied to the crimp terminal is appropriately determined depending on the type of plating and the base material.
In this way, heat at a temperature at which the plating P is melted is applied to the entire crimp terminal 30, and the plating strip P1 generated on the taper portion 33c is melted, whereby the plating strip P1 is plated around the plating strip P1. It disappears in the same smooth surface state as.
This electric current application process is continuously performed with respect to each crimp terminal 30 continuously sent out from a press and a bending machine in the state connected with carrier part B2 and each connection part B1.

  After a current application process is performed on each of the crimp terminals 30 of the plurality of crimp terminals 30 connected to each other, the strip-shaped carrier portion B2 is wound into a reel by a reel winding machine (not shown).

The plurality of crimp terminals 30 wound around the carrier portion B2 in a reel shape are set in a feeder (not shown) of the terminal crimping apparatus 300, and each crimp terminal 30 is subjected to a terminal crimping process by the terminal crimping apparatus 300. Is crimped to the electric wire 20 (see FIG. 6).
The terminal crimping device 300 includes a pair of crimping jigs, an anvil 310 and a crimper 320, which are disposed to oppose each other in order to crimp the crimp terminal 30 to the electric wire 20 in a predetermined shape. The drive mechanism drives the crimper 320 so as to be detachable from the anvil 310.
In this terminal crimping process, first, the crimping portion 32 of the crimping terminal 30 that has undergone a series of processes from the pressing process to the bending process is placed on the terminal of the anvil 310 with the electric wire 20 set on the surface on the folding side. It is mounted on the surface 310a (see FIG. 6A).
Here, the crimp terminal 30 is in a state in which the tip portions 33 d of the pair of crimp pieces 33 b and 33 b of the conductor crimp portion 33 are directed to the opening 320 b of the crimper 320.
In addition, although the part crimped | bonded to the electric wire 20 differs from the conductor crimping part 33 about the covering crimping part 34, since it deform | transforms similarly to the conductor crimping part 33 with the anvil 310 and the crimper 320, the description is abbreviate | omitted.
Next, the crimper 320 starts to descend toward the anvil 310 (see FIG. 6B).
Here, the pair of crimping pieces 33 b and 33 b of the conductor crimping portion 33 starts to bend while the tip portions 33 d of the crimper 320 are in sliding contact with the bending guide surface 320 a of the crimper 320.
When the crimper 320 is further lowered toward the descent position toward the anvil 310, the crimping of the crimp terminal 30 to the electric wire 20 is completed (see FIG. 6C).
In the terminal crimping device 300, when the crimping terminal 30 is crimped to the electric wire 20 by the anvil 310 and the crimper 320, the crimping terminal 30 is separated from the carrier part B2 by dividing the connecting portion B1.

  In the method for manufacturing a terminal crimped electric wire according to the first embodiment of the present invention, after forming the tapered portion 33c on the crimp terminal 30, the temperature at which the plating P is melted by the current application step and the temperature at which the substrate 30a is melted is applied. In order to apply a current to energize between the one end 30b and the other end 30c of the crimp terminal 30 so that heat is applied to the crimp terminal 30 at a temperature less than that, the heat at a temperature at which the plating P is melted over the entire crimp terminal 30 Is added, and the plating strip P1 generated in the taper portion 33c is melted, so that the plating strip P1 becomes a smooth surface state equivalent to the plating P around the plating strip P1 and disappears. It is possible to prevent the reliability of the electrical connection from being lowered by peeling off the plating P of the crimp terminal 30 to be crimped to.

  Moreover, the manufacturing method of the terminal crimping electric wire which concerns on Example 1 of this invention includes the shaping | molding of the taper part 33c by the plate-shaped metal member B used as the raw material of the crimp terminal 30 by which the plating P was given with respect to the base material 30a. After the pressing step and the pressing step, the bending step is applied to the shape of the crimp terminal 30 before being crimped to the electric wire 20, and each of the plurality of crimp terminals 30 is connected at one end 30 b with a connecting portion. Since a current for energizing between the one end 30b and the other end 30c is applied to the crimp terminal 30, it is easy to continuously apply a current application process to each crimp terminal 30 of the plurality of crimp terminals 30. In particular, the current application process can be easily automated.

Next, the manufacturing method of the terminal crimping electric wire which concerns on Example 2 of this invention using FIG. 7 is demonstrated.
FIG. 7 is a diagram illustrating a state in which a current application process is performed on the crimp terminal 30 in a state where crimping is completed on the electric wire 20, with respect to the method for manufacturing the terminal crimp electric wire according to the second embodiment of the present invention.
Although the manufacturing method of the terminal crimping electric wire which concerns on Example 1 of this invention illustrated the method to which an electric current application process is given before the crimping terminal 30 is crimped | bonded to the electric wire 20, the terminal which concerns on Example 2 of this invention The method for manufacturing a crimped electric wire is different from that in Example 1 in that a current application process is performed on the crimp terminal 30 in a state of being crimped to the electric wire 20.
Other configurations are the same as those of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals.

In the manufacturing method of the terminal crimped electric wire of Example 2, heat is applied to the crimp terminal 30 in a state of being crimped to the electric wire 20 at a temperature equal to or higher than the temperature at which the plating P melts and lower than the temperature at which the base material 30a melts. As described above, a current for energizing between the one end 30b and the other end 30c of the crimp terminal 30 is applied.
Specifically, as shown in FIG. 7, when one end 30 b and the other end 30 c of the crimp terminal 30 are brought into contact with both ends of the crimp terminal 30 in a state of being crimped to the electric wire 20, And heat according to the value of the applied current is applied to the entire crimp terminal 30.
By applying heat to the crimp terminal 30 in this manner, the plating P is melted, and as a result, the plating strip P1 generated in the tapered portion 33c is melted, so that the plating around the plating strip P1 is the same. Disappears with a moderate surface condition.

  The manufacturing method of the terminal crimped electric wire according to Example 2 of the present invention is similar to the method of manufacturing the terminal crimped electric wire of Example 1, and after forming the taper portion 33c on the crimping terminal 30, the plating P is applied by the current application process. In order to apply a current for energizing between one end 30b and the other end 30c of the crimp terminal 30 so that heat is applied to the crimp terminal 30 at a temperature equal to or higher than the melting temperature and lower than the temperature at which the base material 30a melts. Heat at a temperature at which the plating P is melted is applied to the entire terminal 30, and the plating strip P1 generated on the taper portion 33c is melted, so that the plating strip P1 is gently similar to the plating P around the plating strip P1. Therefore, it is possible to prevent the reliability of the electrical connection from being lowered by peeling off the plating P of the crimp terminal 30 to be crimped to the electric wire 20.

  The invention made by the present inventor has been specifically described based on the above-described embodiments of the invention. However, the present invention is not limited to the above-described embodiments of the invention and does not depart from the gist thereof. Various changes can be made.

DESCRIPTION OF SYMBOLS 10 Terminal crimping electric wire 20 Electric wire 21 Conductor part 21a Element wire 22 Insulation coating | cover part 30 Crimp terminal 30a Base material 30b One end 30c Other end 30d Surface 31 Opposite terminal connection part 31a Connection main-body part 31b Elastic contact piece 31c Locking protrusion 32 Crimp part 33 Conductor crimping part 33a Bottom wall 33b Crimping piece 33c Taper part 33d Tip part 34 Covering crimping part 34a Bottom wall 34b Crimping piece 35 Intermediate part 35a Bottom wall 36 Connecting part 100 Connector housing 110 Terminal accommodating chamber 200 Current application device 210 Current probe 300 Terminal Crimping device 310 Anvil 310a Terminal placement surface 320 Crimper 320a Bending guide surface 320b Opening 400 Press / bending machine B Plate-like metal member B1 Connecting portion B2 Carrier portion C Connection partner terminal P Plating P1 Plating

Claims (2)

A terminal crimping electric wire having a pair of crimping pieces provided with a tapered portion at the tip and crimping a crimping terminal having the plating formed on the surface thereof to the wire by plating the substrate. In the manufacturing method of
After forming the tapered portion on the crimp terminal, one end to the other end of the crimp terminal is heated so that heat is applied to the crimp terminal at a temperature equal to or higher than the temperature at which the plating melts and lower than the temperature at which the base material melts. A method of manufacturing a terminal crimped wire, comprising: a current applying step of applying a current to be energized. The current application step includes
A pressing step in which the plate-shaped metal member, which is a raw material of the crimp terminal subjected to the plating on the base material, includes forming the tapered portion, and after the pressing step, before being crimped to the electric wire. Applying a current to energize each crimp terminal from the one end to the other end in a state where a bending step is applied to the shape of the crimp terminal and the one end is connected to the other end by a connecting portion. The manufacturing method of the terminal crimping electric wire of Claim 1 characterized by the above-mentioned.

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