JP6784453B2 - Manufacturing method of terminal crimping wire - Google Patents

Description

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

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

For example, Patent Document 1 has a crimping portion for crimping to a terminal portion of an electric wire, a mating connection portion for connecting to a connecting partner of an electric wire, and a crimping portion for connecting the crimping portion and the mating connecting portion. In the terminal, the connection part has a structure that is not easily affected by the deformation of the crimping part, and by preventing the deformation of the mating connection part that is connected to the connecting part, the crimping that prevents the electrical connection stability with the connection partner from deteriorating. The terminals are listed.

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

By the way, the crimp terminal is generally formed by subjecting a plate-shaped 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 crimping terminal, and the tapered portion allows the tip of each crimping piece to enter the conductor portion of the electric wire, so that the crimping terminal is securely crimped to the conductor portion. By doing so, the electrical connection performance is improved.

Japanese Unexamined Patent Publication No. 2015-207436 Japanese Unexamined Patent Publication No. 9-161936

However, after the punching step (see FIG. 8B) as a pressing process for the plate-shaped metal member B (see FIG. 8A) before being molded into the crimp terminal, the taper forming is also performed as a pressing process. When the step (see FIG. 8C) is performed, in the taper forming step, the plating P is pressed by the taper forming tool A and moves along the tapered portion T, and fine plating strips P1 are formed as burrs on the tapered portion T. If it occurs (see FIG. 8D) and the plating strip P1 peels off from the crimp terminal 30 (see FIG. 9B), the peeled plating strip P1 is, for example, a terminal of the connector housing 100. It may be mixed in the connection portion between the crimp terminal 30 housed in the storage chamber 110 and the mating connection terminal C (see FIG. 9C), and the reliability of the electrical connection may be lowered.

The present invention has been made in view of the above, and provides a method for manufacturing a terminal crimping electric wire, which can prevent the reliability of the electrical connection from being lowered due to the peeling of the plating of the crimping terminal crimped to the electric wire. The purpose is to do.

In order to solve the above-mentioned problems and achieve the object, the method for manufacturing a terminal crimping electric wire according to claim 1 of the present invention has a pair of crimping pieces having a tapered portion at the tip portion and is based on the method. In a method for manufacturing a terminal crimping electric wire in which a crimping terminal having the plating formed on the surface of the material is crimped to an electric wire, the plating is applied after the tapered portion is formed on the crimping terminal. 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 the melting temperature and lower than the temperature at which the base material melts is included. It is characterized by that.

Further, in the method for manufacturing a terminal crimping wire according to claim 2 of the present invention, in the above invention, the current application step is a plate-like material in which the base material is plated with the crimping terminal. A pressing step including molding of the tapered portion of the metal member, and after the pressing step, a bending step is performed in the shape of the crimping terminal before being crimped to the electric wire, and the plurality of crimping terminals are at one end. Is characterized by applying a current to energize between one end and the other end of each crimp terminal in a state of being connected by a connecting portion.

In the method for manufacturing a terminal crimping electric wire according to claim 1 of the present invention, after forming the tapered portion in the crimping terminal, the plating is melted at a temperature equal to or higher than the temperature at which the plating is melted by the current application step, and the base material is melted. Since a current is applied between one end and the other end of the crimp terminal so that heat is applied to the crimp terminal below the temperature, the heat at a temperature at which the plating is melted over the entire crimp terminal is generated. When the plated strips are added and the plated strips generated in the tapered portion are melted, the plated strips have a smooth surface state similar to that of the plating around the plated strips and disappear, so that they are crimped to the electric wire. It is possible to prevent the reliability of the electrical connection from being lowered due to the peeling of the plating on the crimp terminal.

The method for manufacturing a terminal crimping electric wire according to claim 2 of the present invention is a pressing step in which a plate-shaped metal member used as a raw material for the crimping terminal, which is plated on the base material, includes molding of the tapered portion. Then, after the pressing step, a bending step is performed on the shape of the crimping terminal before being crimped to the electric wire, and a plurality of the crimping terminals are connected to each crimping terminal at one end by a connecting portion. Since a current for energizing between one end and the other end is applied, it is easy to continuously perform the current application step on each crimp terminal of the plurality of crimp terminals, and as a result, the current application step. Can be easily automated.

FIG. 1 is an exploded perspective view of a terminal crimping wire manufactured by the method for manufacturing a terminal crimping wire according to the present invention. FIG. 2 is a perspective view of a terminal crimping wire manufactured by the method for manufacturing a terminal crimping wire according to the first embodiment of the present invention. FIG. 3 is a diagram for explaining a terminal crimping wire in a state where the crimping terminal is housed in the terminal housing 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 step to a crimp terminal subjected to a pressing step and a bending step on a plate-shaped metal member by a press / bending machine. Is. FIG. 5 is an enlarged view of the periphery of the crimp terminal to which the current is applied among the plurality of crimp terminals shown in FIG. FIG. 6 is a diagram for explaining the flow of the terminal crimping process in which the crimping terminal is crimped to the electric wire. FIG. 7 is a diagram showing a state in which a current application step is applied to a crimp terminal in a state where crimping is completed on the electric wire, regarding the method for manufacturing a terminal crimping electric wire according to the second embodiment of the present invention. FIG. 8 is a diagram for explaining a problem of the prior art. FIG. 9 is a diagram for explaining a problem of the prior art.

Hereinafter, preferred embodiments of the method for manufacturing a terminal crimping electric wire according to the present invention will be described in detail with reference to the drawings.

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

First, the terminal crimping electric wire 10 will be described.
The terminal crimping electric wire 10 is such that the conductor portion 21 of the electric wire 20 and the crimping terminal 30 are electrically connected by crimping the crimping terminal 30 to the conductor portion 21 exposed to 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 rod such as aluminum, an aluminum alloy, copper, or a copper alloy.
In the first embodiment, the conductor portion 21 is illustrated by bundling a plurality of strands 21a, but the present invention is not limited to this, and the conductor portion 21 may be composed of a single core wire.
The insulating 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 so as to protect the conductor portion 21 from the outside so as to be insulable.
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. The crimp terminal 30 is electrically connected to the electric wire 20 by crimping the conductor crimping portion 33, which will be described later, to the exposed conductor portion 21.

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

The mating terminal connecting portion 31 is such that the connecting mating terminal C is brought into contact with the elastic contact piece 31b provided in the cylinder of the connecting main body portion 31a having a square tubular shape (see FIG. 3). The mating terminal connecting portion 31 constitutes a female terminal to which the 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 projecting from the surface of the connecting main body portion 31a.
The mating terminal connection portion 31 is exemplified as having a female terminal, but the present invention is not limited to this, and any other terminal configuration may be used as long as it can be connected to the connecting mating terminal C.

The crimping portions 32 are provided at two locations spaced apart from each other in the extending direction of the electric wire 20.
One crimping portion 32 is a conductor crimping portion 33 crimped to the exposed conductor portion 21 of the electric wire 20, and the other crimping portion 32 is a coated crimping portion 34 crimped to the insulating coating portion 22 of the electric wire 20. Is. The conductor crimping portion 33 and the covering crimping portion 34 are connected by an intermediate portion 35.
Further, the conductor crimping portion 33 is connected to the mating terminal connecting portion 31 by the connecting portion 36.
The conductor crimping portion 33, the intermediate portion 35, and the covering crimping portion 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 tip portion 33d of each crimping piece 33b, 33b, and the tapered portion 33c facilitates the tip 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 surely crimping the 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 erected 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 step and a bending step.
More specifically, the crimp terminal 30 is subjected to a taper forming step after the punching step as the general pressing step described above.
Therefore, in the taper forming step, the plating P is pressed by the jig A, and the plating P is moved along the tapered portion 33c together with the forming of the tapered portion 33c, so that the fine plated strips P1 are formed as burrs on the tapered portion 33c. Occur.

The crimp terminal 30 is brought into a state as shown in FIG. 1 by performing a bending step after the pressing step.
That is, in the crimp terminal 30 subjected to the bending step, the conductor crimping portion 33 and the covering crimping portion 34 are bent in a substantially U shape in which the tips of the pair of crimping pieces 33b and 34b are opened. There is.

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

A plurality of crimp terminals 30 that have undergone a pressing process and a bending process are continuously sent out from the pressing / bending machine by the press / bending machine 400 on the plate-shaped metal member B that is the raw material of the crimp terminal 30. (See Fig. 4).
Here, the plurality of crimp terminals 30 are in a state where one end 30b side is connected by the connecting portion B1.
More specifically, in the plurality of crimp terminals 30, the connecting portion B1 corresponding to each crimp terminal 30 is connected to the band-shaped carrier portion B2, and the carrier portion B2 and each connecting portion B1 are connected to each other. ing.
The plurality of crimp terminals 30 are continuously fed from the press / bending machine 400 by pulling out the carrier portion B2 in the feeding direction of the crimp terminals 30 from the press / bending machine 400.

In this way, a current application step is applied to each crimp terminal 30 continuously sent out from the press / bending machine 400 (see FIGS. 4 and 5).
In the current application step, after forming the tapered portion 33c on the crimp terminal 30, 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 below the temperature at which the base material 30a melts. This is a step of applying an electric current for energizing between one end 30b and the other end 30c.
More specifically, in the current application step, the current application device 200 is used to bring the energizing probes 210 and 210 of different electrodes into contact with both ends of the crimp terminal 30, so that one end 30b and the other end 30c of the crimp terminal 30 are contacted. This is a step of energizing the space between them and applying heat corresponding to the value of the applied current to the entire crimp terminal 30.
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 in the tapered portion 33c is melted, so that the plating strip P1 becomes the plating P around the plating strip P1. It becomes a gentle surface condition similar to that and disappears.
This current application step is continuously applied to each crimp terminal 30 continuously sent out from the press / bending machine in a state of being connected by the carrier portion B2 and each connecting portion B1.

After a current application step is applied to each of the crimp terminals 30 of the plurality of crimp terminals 30 connected to each other, the band-shaped carrier portion B2 is wound in a reel shape by a reel winding machine (not shown).

The plurality of crimp terminals 30 in which the carrier portion B2 is wound in a reel shape are set in an input machine (not shown) of the terminal crimping device 300, and each crimping terminal 30 is subjected to a terminal crimping step by the terminal crimping device 300. Is crimped onto the wire 20 (see FIG. 6).
The terminal crimping device 300 has an anvil 310 and a crimper 320, which are a pair of crimping jigs arranged to face each other in order to crimp the crimp terminal 30 to the electric wire 20 in a predetermined shape, and is not shown. The drive mechanism drives the crimp 320 so as to be detachable from the anvil 310.
In this terminal crimping step, first, the crimping portion 32 of the crimping terminal 30 that has completed a series of processes from the pressing step to the bending step is placed on the terminal of the anvil 310 with the electric wire 20 set on the surface on the bending side. It is placed on the surface 310a (see FIG. 6A).
Here, the crimp terminal 30 is in a state in which the pair of crimp pieces 33b of the conductor crimp portion 33 and the tip portion 33d of the 33b are directed toward the opening 320b of the crimper 320.
Although the portion of the coated crimping portion 34 that is crimped to the electric wire 20 is different from that of the conductor crimping portion 33, the description thereof will be omitted because it is deformed by the anvil 310 and the crimper 320 in the same manner as the conductor crimping portion 33.
The crimper 320 then begins descending towards the anvil 310 (see FIG. 6B).
Here, the pair of crimping pieces 33b of the conductor crimping portion 33 and the tip portions 33d of 33b are slidably contacted with the bending guiding surface 320a of the crimper 320 to start bending.
Further, when the crimper 320 is lowered toward the anvil 310 to the lowering completion position, 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 portion B2 by dividing the connecting portion B1.

The method for manufacturing a terminal crimping wire according to Example 1 of the present invention is a temperature at which the plating P is melted or higher and the base material 30a is melted by a current application step after forming the tapered portion 33c on the crimping terminal 30. Since a current is applied 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 less than, 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 tapered portion 33c is melted, so that the plating strip P1 disappears in a smooth surface state similar to that of the plating P around the plating strip P1. It is possible to prevent the reliability of the electric connection from being lowered due to the peeling of the plating P of the crimp terminal 30 that is crimped to.

Further, the method for manufacturing a terminal crimping electric wire according to the first embodiment of the present invention includes forming a tapered portion 33c of a plate-shaped metal member B which is a raw material of a crimping terminal 30 in which a base material 30a is plated P. After the pressing step and the pressing step, a bending step is performed in the shape of the crimping terminal 30 before being crimped to the electric wire 20, and each of the plurality of crimping terminals 30 is connected at one end 30b by a connecting portion. Since a current for energizing between one end 30b and the other end 30c is applied to the crimp terminal 30, it is easy to continuously apply a current to each crimp terminal 30 of the plurality of crimp terminals 30, resulting in a result. Therefore, the current application process can be easily automated.

Next, a method of manufacturing the terminal crimping wire according to the second embodiment of the present invention will be described with reference to FIG. 7.
FIG. 7 is a diagram showing a state in which a current application step is applied to a crimp terminal 30 in a state where crimping is completed on the electric wire 20 with respect to the method for manufacturing a terminal crimping wire according to a second embodiment of the present invention.
The method for manufacturing a terminal crimping electric wire according to the first embodiment of the present invention illustrates a method in which a current application step is performed before the crimping terminal 30 is crimped to the electric wire 20, but the terminal according to the second embodiment of the present invention is illustrated. The method for manufacturing a crimped electric wire is different from that of the first embodiment in that a current application step is applied to the crimped terminal 30 in a state of being crimped to the electric wire 20.
The other configurations are the same as those in the first embodiment, and the same components as those in the first embodiment are designated by the same reference numerals.

In the method of manufacturing the terminal crimping electric wire of the second embodiment, heat is applied to the crimping 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 below the temperature at which the base material 30a melts. As described above, a current for energizing between one end 30b and the other end 30c of the crimp terminal 30 is applied.
Specifically, as shown in FIG. 7, one end 30b and the other end 30c of the crimp terminal 30 are brought into contact with the current-carrying probes 210 and 210 of different electrodes at both ends of the crimp terminal 30 in a state of being crimped to the electric wire 20. The space between the and is energized so that heat corresponding 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 way, the plating P is melted, and as a result, the plating strip P1 generated in the tapered portion 33c is melted, which is the same as the plating around the plating strip P1. It becomes a gentle surface condition and disappears.

The method for manufacturing the terminal crimping wire according to the second embodiment of the present invention is the same as the method for manufacturing the terminal crimping wire of the first embodiment, after forming the tapered portion 33c on the crimping terminal 30, the plating P is formed by a current application step. Since a current is applied 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, crimping is performed. The heat of the temperature at which the plating P is melted is applied to the entire terminal 30, and the plating strip P1 generated in the tapered portion 33c is melted, so that the plating strip P1 is as gentle as the plating P around the plating strip P1. Since the surface state is changed and disappears, it is possible to prevent the reliability of the electrical connection from being lowered due to the peeling of the plating P of the crimp terminal 30 crimped to the electric wire 20.

The invention made by the present inventor has been specifically described above based on the above-mentioned examples of the invention, but the present invention is not limited to the above-mentioned examples of the invention and does not deviate from the gist thereof. Can be changed in various ways.

10 Terminal crimping wire 20 Wire 21 Conductor part 21a Wire 22 Insulation coating part 30 Crimping terminal 30a Base material 30b One end 30c The other end 30d Surface 31 Partner terminal connection part 31a Connection body part 31b Elastic contact piece 31c Locking protrusion 32 Crimping part 33 Conductor crimping part 33a Bottom wall 33b Crimping piece 33c Tapered part 33d Tip part 34 Coated crimping part 34a Bottom wall 34b Crimping piece 35 Intermediate part 35a Bottom wall 36 Connecting part 100 Connector housing 110 Terminal storage room 200 Current application device 210 Energizing probe 300 terminals Crimping device 310 Anvil 310a Terminal mounting surface 320 Clymp 320a Bending guide surface 320b Opening 400 Press / bending machine B Plate-shaped metal member B1 Connecting part B2 Carrier part C Connecting partner terminal P Plating P1 Plating strip

Claims (2)

A terminal crimping wire that has a pair of crimping pieces with a tapered portion at the tip and crimps a crimping terminal that has the plating formed on the surface by plating the base material. In the manufacturing method of
After forming the tapered portion on the crimp terminal, one end to the other end of the crimp terminal 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 below the temperature at which the base material melts. A method for manufacturing a terminal crimping wire, which comprises a current application step of applying a current to energize the wire. The current application step is
Before the plate-shaped metal member, which is the raw material of the crimping terminal plated on the base material, is crimped to the electric wire after the pressing step including molding of the tapered portion and the pressing step. A bending step is performed on the shape of the crimp terminal, and a current is applied to each crimp terminal from one end to the other end in a state where the plurality of crimp terminals are connected by a connecting portion. The method for manufacturing a terminal crimping electric wire according to claim 1.

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