JP2650163B2 - Lead wire connection method and connector pin manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a connector pin (hereinafter referred to as "connector pin").
The present invention relates to a method of connecting a conductor to a conductor fitting such as a connector pin, including a conductor connected to the connector pin body, and particularly to a conductor having an insulating coating (generally referred to as an enameled copper wire). The present invention relates to a connector pin and a method of connecting a lead wire, which are welded to a pin body and crimped to a connector pin body by a crimping piece of a wire connection part.

[0002]

2. Description of the Related Art A connector pin includes a connector pin body formed of a metal piece in a predetermined shape and a conductor. The connector pin body is electrically connected to a connector insertion portion to be inserted into a female connector and a conductor. It has a wire connection portion and a wire holding portion that holds the conductor and prevents the conductor from falling off or bending. Conventionally, before connecting the conductor to the connector pin body, the insulating coating on the end part of the conductor is removed by a mechanical or chemical method, inserted into the wire connection part of the connector pin body, and provided at the wire connection part. The crimping piece crimps the end of the conductor to the connector pin body.

FIG. 4 shows a process of removing the insulating coating on the end portion of the conductive wire with an insulating coating removing roller. Conductor 21
Has an insulating coating 23 on the outer peripheral surface of the conductor 22. On the other hand, a pair of insulating coating removing rollers 24
They are arranged in parallel at a distance that allows one conductor portion 22 to pass therethrough. This insulating coating removing roller 2
4 is constantly rotating in the direction R shown in the figure. By inserting the end portion of the conductor 21 having the insulation coating 23 between the pair of insulation removal rollers 24 as shown in the figure, the insulation 23 of the conductor 23 is ground by the insulation removal roller 24, The conductor portion 22 is exposed. In addition to the mechanical method of removing the insulating coating 23 of the conductive wire 21 by the above-described insulating coating removing roller 24, there is a chemical method of removing the insulating coating with a solvent. In this chemical method, the terminal portion of the conductive wire 21 is immersed in a solvent corresponding to the components of the insulating coating 23, and the insulating coating 23 is dissolved and removed.

FIG. 5 shows a conventional connector pin. The connector pin 25 includes a conductor 21 and a connector pin main body 26. Connector pin body 26
A connector insertion portion 27 inserted into a female connector (not shown), a wire connection portion 28 connected to the conductive wire 21,
And a wire holding portion 29 for holding the conductive wire 21. Conducting wire 21 from which insulating coating 23 at the end is removed
Is inserted into the wire connecting portion 28 of the connector pin body 26 and is crimped to the connector pin body 26 by a pair of crimping pieces 30 provided on the wire connecting portion 28. When the end portion of the conductive wire 21 from which the insulating coating 23 has been removed comes into contact with the wire connection portion 28 and the crimping piece 30, the conductive wire 21 is electrically connected to the connector pin main body 26.

[0005]

However, the above-mentioned conventional connector pins have the problems that the reliability of the electrical connection between the connector pin body and the conductor is low and that the productivity of the connection work of the connector pins is low. was there.
That is, in a conventional connector pin in which the insulation coating of the above-mentioned conductor is removed by an insulation-removing roller and pressed against the connector pin body, only the surface of the conductor that is ground by the insulation-removing roller has the insulation removed. As a result, the insulating coating is not removed over the entire outer peripheral surface of the conductor. Therefore, when the conductor is inserted into the wire connection part of the connector pin body and crimped, the surface of the conductor from which the insulating coating has been removed must be arranged so as to be in contact with the connector pin body. It was difficult to arrange the conductors in the predetermined direction as described above. When the surface of the conductive wire where the insulating coating remained contacted the crimping piece of the connector pin body, an electrical connection failure occurred. On the other hand, in a conventional connector pin in which the insulating coating of the conductor is removed with a solvent and crimped to the connector pin body, the insulating coating of the conductor is removed over the entire outer peripheral surface, and the problem of poor connection does not occur. The operation of immersing the end portion of the substrate in a solvent to remove the insulating coating requires time, is difficult due to the deterioration of the solvent and the control of the immersion time, and has a problem that the productivity of the entire connector pin is low. SUMMARY OF THE INVENTION It is an object of the present invention to provide a connector pin having high productivity and a method of connecting a conductive wire thereof while preventing electrical connection failure.

[0006]

According to a first aspect of the present invention, there is provided a method for connecting a conductive wire, wherein the connecting metal fitting is disposed between a positive electrode rod and a negative electrode rod with a conductive wire having an insulating coating inserted into the connecting metal fitting. After applying a current to the positive electrode rod through a heating electrode to heat the positive electrode rod, the positive electrode rod and the negative electrode rod are used to heat and compress the conductive wire from outside the connection fitting in a state where a potential difference is applied. Then, the insulating coating of the conductive wire is destroyed by the heat of the positive electrode rod and the compressive force between the positive and negative electrode rods, and then the current is passed through the conductive wire whose insulating coating is broken, and the conductive wire is welded to the connection fitting by the resistance heat. The welded portion between the solidified conductor and the connection fitting is press-bonded by the connection fitting. The method of manufacturing a connector pin according to claim 2 of the present application is to form a connector pin body having a connector insertion portion, a wire holding portion, and a wire connection portion by plastically processing a metal piece, and to connect a wire to the wire connection portion of the connector pin body. Inserting a conductive wire having an insulating coating into a wire connecting portion of the formed connector pin main body, and a wire connecting portion of the connector pin main body into which the conductive wire has been inserted. Is disposed between a positive electrode rod and a negative electrode rod, and after heating the positive electrode rod by passing a current through the heating electrode to the positive electrode rod, the positive electrode rod and the negative electrode are applied in a state where a potential difference is applied. The conductive wire is heated and compressed by an electrode rod from outside the wire connection portion of the connector pin body, and the insulating coating of the conductive wire is heated between the heat of the positive electrode rod and the positive and negative electrode rods. A step of breaking by a compressive force, and passing a current of the positive and negative electrode rods through the conductive wire in which the insulating coating is broken, and welding the conductive wire to the connector pin body by resistance heat due to the current and a compressive force between the positive and negative electrode rods. And a step of crimping the welded portion of the solidified conductor wire to the connector pin main body with a crimping piece of the wire connection portion. The method of manufacturing a connector pin according to claim 3 of the present invention is the manufacturing method of claim 2, wherein the connector pin body is formed of a thin plate of any one of phosphor bronze and brass, and tin-plated on the surface. It is characterized by having.

[0007]

According to the conductor connecting method of the present invention, a conductor having an insulating coating is inserted between the metals of the connection fitting, and the conductor is heated and compressed by the electrode heated to a predetermined temperature via the metal of the connection fitting. The insulating coating of the conductor is broken by the heat and pressure of the electrodes, and current flows through the conductor, and the conductor is welded to the connection fitting by the resistive heat and compressive force of the current. In this case, a part of the insulation coating of the conductor is vaporized at the stage of melting and solidification, and the remaining part precipitates outside the conductor welding part, and the conductor and the connector pin body are completely electrically connected via the conductor welding part. State. Since the connector pin of the present invention connects the conductor to the connector pin body by the above-described method, the step of removing the insulating coating of the conductor can be omitted, and the electrical conduction can be ensured irrespective of the arrangement direction of the conductor. Connector pins can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an enlarged view of the connector pin of the present invention. The connector pin 1 has a connector pin main body 2 in which a metal piece is formed in a predetermined shape, and a conductive wire 3 connected to the connector pin main body 2. The connector pin body 2 includes a connector insertion portion 4 inserted into the socket portion of the female connector, a wire connection portion 5 electrically connected to the conductive wire 3, and a wire connection portion 5 for holding a wire.
And a wire holding portion 6 for protecting the conductive wire 3 from falling off from external force. The connector insertion portion 4 of the connector pin main body 2 elastically expands and engages with a contact piece 7 that contacts the inside of the socket portion of the female connector (not shown) and the socket portion of the female connector once inserted. And an engagement piece 8 for preventing the connector pin 1 from falling off. With the above structure, when the connector pin 1 is inserted into the female connector, the connector pin 1 is electrically connected to the female connector by the contact piece 7 of the connector insertion section 4 and the engagement piece of the connector insertion section 4 is formed. 8 prevents the female connector from falling off. The wire connecting portion 5 of the connector pin main body 2 is
A pair of crimping pieces 9 are provided at positions on both sides of the end portion of. The crimping piece 9 is bent above the conductor 3 and crimps the electrical connection portion of the conductor 3 to the connector pin body 2. Wire holding part 6 of connector pin body 2
Has a pair of holding pieces 10 at positions on both sides of a portion slightly inside the end of the inserted conductive wire 3. Holding piece 10
Is bent above the conductor 3, and the conductor 3 is pressed against the connector pin body 2 from outside the insulating coating. As a result, the conductor 3 is held, and when the conductor 3 is subjected to a tensile force or bending, the connection portion of the wire connection part 5 is protected.

FIG. 2 shows a cross section of the connector pin 1. The conductor 3 is connected to the connector pin body 2 at the end.
Welded to. The conductor welding portion 11 is in close contact with the wire connection portion 5 of the connector pin main body 2 and is electrically connected to the connector pin main body 2. The wire welding portion 11 is further crimped to the connector pin main body 2 by crimping pieces 9 formed on the wire connection portion 5 to further ensure electrical conduction of the wire welding portion 11 and to remove the wire welding portion 11. To prevent.

The method of manufacturing the connector pin 1 according to the present invention will be described below. The connector pin body 2 forms a plate-shaped metal piece into a predetermined shape by conventional press working. Next, the conductive wire 3 having an insulating coating is inserted into the formed wire connection portion 5 of the connector pin main body 2, and the conductive wire 3 is connected to the connector pin main body 2 by welding.

FIG. 3 shows the configuration of an apparatus for welding the connector pin body 2 of the connector pin 1 and the conductor 3 according to the present invention. The wire connection device 12 has a positive electrode rod 13 to which a positive voltage is applied and a negative electrode rod 14 to which a negative voltage is applied. The positive electrode rod 13 and the negative electrode rod 14 are arranged to face each other, and the negative electrode rod 14 is driven by a hydraulic cylinder 15 and moves in the direction P shown in the drawing to compress the wire connection part 5 of the connector pin body 2. It is configured to be able to. The hydraulic cylinder 15 communicates with a pressurizing device 16 and is configured to be able to expand and contract by operating and stopping the pressurizing device 16. Wire connection device 1
2 has a power supply 17, and the positive electrode of the power supply 17 is a positive electrode rod 1
3 and the negative electrode is connected to the negative electrode rod 14. Further, the positive electrode rod 13 is connected to the heating electrode 18 at a position slightly inside the tip. The heating electrode 18 is connected to a negative electrode of the power supply 17. A portion between the point D of the positive electrode rod 13 and the point E of the heating electrode 18 is made of a member having a large electric resistance and capable of withstanding high temperatures, and is configured so that the positive electrode rod 13 becomes high temperature when a voltage is applied. Have been. The conducting wire 3 having an insulating coating is inserted into the wire connecting portion 5 of the connector pin main body 2, and this is disposed between the positive electrode bar 13 and the negative electrode bar 14 of the above-described wire connecting device 12. By closing switch 19, current flows from positive electrode A of power supply 17 to negative electrode G of power supply 17 via points B, C, D, E, and F of the circuit. Due to the electric resistance of the member between the points D and E, the temperature of the positive electrode rod 13 becomes high and the electric potential difference between the positive electrode rod 13 and the negative electrode rod 14 is high. Next, the pressurizing device 16 is operated to move the negative electrode rod 14 through the hydraulic cylinder 15 in the direction P shown in the drawing. The positive electrode rod 13 and the negative electrode rod 14 sandwich the connector pin 1 between them, and furthermore, the conductor 3
Are continuously compressed. In the wire connecting portion 5 of the connector pin 1, the current does not initially flow from the positive electrode rod 13 to the negative electrode rod 14 because the conductive wire 3 has an insulating coating, but after a predetermined time, the two electrode rods 13, 14 , And the high temperature of the positive electrode rod 13, the insulating coating of the conductive wire 3 is broken, and a current flows between the two electrode rods 13, 14. At this time, current flows from the positive electrode A of the power supply 17 to the negative electrode G via the points B, C, D, H, I, J and F of the electrode circuit due to the high electric resistance of the heating electrode 18. Due to this current, the end of the conductive wire 3 is partially melted and welded to the connector pin main body 2. Part of the insulation of the conductor 3 evaporates during the welding,
A part thereof is deposited outside the wire welding portion 11 shown in FIG. 2, and the wire welding portion 11 and the connector pin main body 2 are completely electrically connected. Further, after the wire welding portion 11 is solidified, the wire welding portion 11 is pressed against the connector pin body 2 by the crimping pieces 9 of the wire connection portion 5 and does not peel off. In the connection work between the connector pin body 2 and the conductor 3, when the connector pin body 2 is made of brass or phosphor bronze metal and the surface of the metal piece is tin-plated, the connector pin body 2 and the conductor 3 is particularly easy to weld. That is, the conductor 3 is connected to the connector pin body 2.
Is inserted and compressed by the positive electrode rod 13 and the negative electrode rod 14, the tin plating of the crimping piece 9 of the connector pin body 2 is first dissolved by the high temperature of the positive electrode rod 13, and the dissolved tin solution An electric current flows between the positive electrode rod 13 and the negative electrode rod 14 via. Due to the flowing current, the entire connecting portion of the conductive wire 3 becomes high temperature, and the positive electrode rod 13 and the negative electrode rod 14
In combination with the compressive force of the above, welding of the conductive wire 3 becomes easier.

In this embodiment, the welding of the conductor 3 is
It was performed under the conditions described. Material of electrode rod: Tungsten alloy Material of connector pin body: Tin-plated phosphor bronze metal Conductor 3: Φ0.8 mm × 4 Insulation coating of conductor 3: Two layers of self-lubricating amide imide and modified polyester Insulation coating consisting of: Compression force of both electrode rods: 35 to 45 kg / cm²  Compression time with both electrode rods: 0.9 seconds Welding voltage: AC 3.2 V Welding current: 10 KA (maximum) As a result of welding under the above conditions, connector pin body 2
Completely electrically conductive with the conductor 3 to prevent poor connection
I was able to.

[0013]

As is apparent from the above description, the connector pin of the present invention does not cause a poor connection electrically because the conductor is welded to the connector pin body. Further, according to the lead wire connecting method according to the present invention, a lead wire having an insulating coating and a connection part of a connection fitting are arranged between a positive electrode rod and a negative electrode rod heated to a predetermined temperature, Breaking down the insulation of the conductor by temperature and compressive force,
Since the conductor is welded to the connector pin, the step of removing the insulation coating of the conductor can be omitted, the productivity is high, the conductor connection method that reliably prevents poor electrical connection, and a connector that is easy to manufacture You can get a pin.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connector pin according to the present invention.

FIG. 2 is a side view in which a part of a connector pin according to the present invention is cut and shown.

FIG. 3 is a schematic front view showing the configuration of a wire connecting device for connecting a connector pin body of a connector pin and a conductive wire by welding according to the present invention.

FIG. 4 is a schematic view showing a process of removing an insulating coating of a conventional conductive wire using an insulating coating removing roller.

FIG. 5 is a perspective view showing a part of a conventional connector pin cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connector pin 2 Connector pin main body 3 Conductor 4 Connector insertion part 5 Wire connection part 6 Wire holding part 9 Crimp piece 11 Conductive wire welding part 12 Wire connection device 13 Positive electrode rod 14 Negative electrode rod

Claims (3)

(57) [Claims] 1. A connecting metal fitting is disposed between a positive electrode rod and a negative electrode rod in a state where a conductive wire having an insulating coating is inserted into the connecting metal fitting, and a current is applied to the positive electrode rod via a heating electrode. After heating the positive electrode rod, the conductive wire is heated and compressed from the outside of the connection fitting by the positive electrode rod and the negative electrode rod in a state where a potential difference is applied, and the insulating coating of the conductive wire is heated by the heat of the positive electrode rod. The conductor is broken by the compressive force between the positive and negative electrode rods, and then the current is passed through the conductor whose insulating coating has been destroyed, and the conductor is welded to the connection fitting by the resistance heat. Conductive wire connection method characterized by crimping. 2. A metal piece is plastically processed to form a connector pin body having a connector insertion portion, a wire holding portion, and a wire connection portion, and a conductive wire is inserted into the wire connection portion of the connector pin body to be electrically connected. A step of inserting a conductive wire having an insulating coating into a wire connecting portion of the formed connector pin body, and connecting the wire connecting portion of the connector pin body into which the conductive wire is inserted with a positive electrode rod and a negative electrode rod. After heating the positive electrode by passing a current through the heating electrode to the positive electrode and heating the positive electrode, the positive electrode and the negative electrode are used to connect the conductor to the connector with a potential difference applied. Heating and compressing from outside the wire connection portion of the pin body, and breaking the insulating coating of the conductive wire by the heat of the positive electrode rod and the compressive force between the positive and negative electrode rods; The electric current of the positive and negative electrode rods is passed through the conductor in which the insulating coating has been broken, and the resistive heat generated by the current and the compressive force between the positive and negative electrode rods are used to weld the conductor to the connector pin main body and to form a welded portion of the solidified conductor. Crimping the connector pin main body with the crimping piece of the wire connection part. 3. The method of manufacturing a connector pin according to claim 2, wherein said connector pin main body is formed of a thin plate of a metal such as phosphor bronze or brass, and the surface thereof is plated with tin.