WO2017010296A1 - Terminal-equipped wire and electrode for resistance welding - Google Patents

Abstract

An electrode 10 for resistance welding welds, by means of resistance welding, an exposed conductor 22 exposed at the terminal of an electric wire 21 comprising a conductor 22 covered by an insulating sheath 23, and a cylindrical part 25 of a terminal 24 having a cylindrical part 25 through which the exposed conductor 22 is passed. The electrode 10 for resistance welding is made from a material having a lower resistance than the terminal 24, and has a pair of electrode parts 11 that clamp the cylindrical part 25 through which the exposed conductor 22 is passed, and the electrode parts 11 have a crimping part that comes into contact with and crimps the cylindrical part 25, and an electrode contact part 14 that comes into contact with the other electrode part 11.

Description

Electric wire with electrodes and terminals for resistance welding

The present invention relates to an electrode for resistance welding and an electric wire with a terminal.

In the end of the electric wire formed by covering the core wire with an insulating coating, the exposed conductor is connected to the exposed conductor in the terminal or other end of the electric wire by, for example, resistance welding (see, for example, Patent Document 1).

JP 2009-123451 A

The resistance welding method is executed by passing a predetermined current between a pair of electrodes with a thing connected by welding (for example, an exposed conductor of a wire and a terminal) sandwiched between the pair of electrodes.

As an electrode used in the resistance welding method, for example, an electrode having a flat surface facing the other electrode as described in Patent Document 1 is known.

However, when resistance welding is performed using an electrode having a flat opposite surface, current continues to flow to the workpiece to be connected (exposed conductor, terminal, etc.) connected by welding, so that the workpiece is shaped as desired. There was a problem that was difficult.

The present invention has been completed based on the above-described circumstances, and an object thereof is to provide an electrode for resistance welding capable of making an object to be welded into a desired shape.

The present invention is an electrode for connecting, by resistance welding, an exposed conductor exposed at an end of an electric wire whose conductor is covered with an insulating coating, and the cylindrical portion of a terminal having a cylindrical portion through which the exposed conductor is inserted. And having a pair of electrode parts sandwiching the cylindrical part through which the exposed conductor is inserted, the electrode part being in contact with the cylindrical part and crimping the cylindrical part. It is an electrode for resistance welding which has a crimping | compression-bonding part and the electrode contact part which contacts the other electrode part.

Further, the present invention provides an electrode for resistance welding by connecting an exposed conductor exposed at an end of an electric wire whose conductor is covered with an insulating coating, and the cylindrical portion of a terminal having a cylindrical portion through which the exposed conductor is inserted. It is an electric wire with a terminal obtained by resistance welding using.

In the present invention, the electrode used when connecting the tubular portion of the terminal through which the exposed conductor exposed at the terminal is connected by resistance welding is made of a material having a resistance value lower than that of the terminal, and the pair of electrode portions is tubular. A pressure-bonding portion that contacts and crimps the portion, and an electrode contact portion that contacts the other electrode portion.

When the tubular portion of the terminal is crimped by resistance welding using the electrode for resistance welding of the present invention, the crimping portion comes into contact with the tubular portion and crimps the tubular portion, while the electrode contact portion is in contact with the other electrode portion. Contact. Here, since the electrode is made of a material having a resistance value lower than that of the terminal, when the electrode contact portion comes into contact with the other electrode portion and the pair of electrode portions comes into contact, current does not flow to the cylindrical portion (terminal). It flows between the contact parts (between the electrode parts). As a result, according to the present invention, it is possible to stop heating when the workpiece is formed into a desired shape, and thus to provide an electrode for resistance welding that can form the workpiece into a desired shape. Can do.

The present invention may have the following configurations.
The electrode part may have an escape part for escaping the cylindrical part crimped by the crimp part. With such a configuration, the cylindrical part crimped by the crimping part escapes to the escape part, so that the cylindrical part is not crushed too much.

According to the present invention, it is possible to provide an electrode for resistance welding that can make a workpiece to have a desired shape.

Front view of electrode for resistance welding of this embodiment Electrode top view Electrode side view The perspective view explaining a mode that an electric wire is inserted in the cylindrical part of a terminal The perspective view which shows a mode that the electric wire was inserted in the cylindrical part Partial sectional view explaining the state before crimping the cylindrical part Partial cross-sectional view explaining the state after crimping the cylindrical part

<Embodiment 1>
An electrode 10 for resistance welding according to a first embodiment of the present invention will be described with reference to FIGS. In the following description, the left side in FIG. 4 is the front and the right side is the rear. The vertical direction is based on FIGS. 6 and 7.

The electrode 10 of the present embodiment is composed of two electrodes 10A and 10B arranged one above the other. The upper electrode 10A is the upper electrode 10A, and the lower electrode 10B is the lower electrode 10B.

Each electrode 10 is made of a material having a lower resistance value and a higher melting point than the terminal 24, and includes an electrode part 11 and a columnar electrode holding part 18 that holds the electrode part 11. Examples of the material of the electrode 10 include tungsten and molybdenum. Tungsten is preferable as a material for the electrodes 10A and 10B.

As shown in FIGS. 1 and 2, the pair of electrode parts 11 are adjacent to the crimping part 12 formed in the center, the recessed relief parts 13 provided on both sides of the crimping part 12, and the relief parts 13. A flat planar electrode contact portion 14 provided.

As shown in FIG. 6, the crimping portion 12 has a front view arc shape, and inclined surfaces are formed on the near side and the far side. The escape portion 13 has a front view arc shape, and is a portion that allows the cylindrical portion 25 crimped by the crimp portion 12 to escape sideways.

A flat flat portion formed adjacent to the escape portion 13 is an electrode contact portion 14 that contacts the other electrode portion 11 as shown in FIG. The upper end surface of the electrode contact portion 14 of the lower electrode 11B and the lower end surface of the electrode contact portion 14 of the upper electrode 11A are in contact with each other during welding.

Next, the terminal-attached electric wire 20 produced using the resistance welding electrode 10 of the present embodiment will be described. The terminal-attached electric wire 20 is formed by connecting an exposed conductor 22 exposed at the end of the electric wire 21 to a terminal 24.

Although it does not specifically limit as the electric wire 21 which comprises the electric wire 20 with a terminal, For example, the conductor 22 which consists of the twisted wire which combined the metal element wire made from copper, copper alloy, aluminum, or aluminum alloy is insulation-coated 23 An electric wire 21 coated with or the like can be used (see FIG. 4).

As the terminal 24, a metal material having a higher resistance value and a lower melting point than those of the electrode 10 can be used.

As shown in FIG. 4, the terminal 24 has a cylindrical shape 25 that is cylindrical and connected to the exposed conductor 22 of the electric wire 21, and a terminal connection portion 26 that is connected to other terminals. A circular terminal insertion hole 26 </ b> A through which another terminal is inserted and connected is formed substantially through the center of the plate-like terminal connection portion 26.

A method for manufacturing the electric wire 20 with terminals will be described. The insulation coating 23 at the end of the electric wire 21 is peeled off and the conductor 22 is exposed. Next, the exposed conductor 22 exposed at the end of the electric wire 21 is inserted into the tubular portion 25 of the terminal 24 as shown in FIG.

Next, the cylindrical portion 25 of the terminal 24 into which the exposed conductor 22 is inserted is crimped by resistance welding to connect the terminal 24 and the electric wire 21. Specifically, the cylindrical portion 25 of the terminal 24 into which the exposed conductor 22 is inserted is disposed so as to correspond to the crimp portion 12 of the lower electrode 10B and the crimp portion 12 of the upper electrode 10A, as shown in FIGS. In this manner, the pair of electrodes 10 </ b> A and 10 </ b> B are moved in the approaching direction, and current is passed between the pair of electrode portions 11 to perform resistance welding. When the crimping portion 12 of the upper electrode 10A and the crimping portion 12 of the lower electrode 10B come into contact with the cylindrical portion 25, current flows from the upper electrode 10A to the lower electrode 10B via the cylindrical portion 25.

When the crimping part 12 of the upper electrode 10A and the crimping part 12 of the lower electrode 10B are further brought closer, the cylindrical part 25 sandwiched and pressed between the crimping parts 12 of the pair of electrodes 10A and 10B arranged vertically is The pressed cylindrical portion 25 is released to the escape portion 13 side while being crimped so that the size is reduced. Further, when the pair of electrodes 10A and 10B are brought closer to each other and the lower end surface of the electrode contact portion 14 of the upper electrode 10A comes into contact with the upper end surface of the electrode contact portion 14 of the lower electrode 10B, the current is supplied to the cylindrical portion 25 (terminal 24). Flows between the electrode contact portions 14 (between the electrode portions 11). As a result, the terminal-attached electric wire 20 in which the tubular portion 25 is crimped to a desired shape (cross-sectional shape shown in FIG. 7) is obtained.

Next, functions and effects of this embodiment will be described.
In the present embodiment, the electrode 10 used when connecting the tubular portion 25 of the terminal 24 through which the exposed conductor 22 exposed at the terminal is inserted by resistance welding is made of a material having a resistance value lower than that of the terminal 24 and a pair of The electrode portion 11 has a crimping portion 12 that contacts and crimps the cylindrical portion 25, and an electrode contact portion 14 that contacts the other electrode portion 11.

Therefore, when the tubular portion 25 of the terminal 24 is compressed by resistance welding using the electrode 10 for resistance welding according to the present embodiment, the crimping portion 12 comes into contact with the tubular portion 25 and crimps the tubular portion 25. The electrode contact portion 14 of one electrode portion 11 is in contact with the electrode contact portion 14 of the other electrode portion 11. Here, since the electrode 10 is made of a material having a resistance value lower than that of the terminal 24, when the electrode contact portions 14 come into contact with each other and the pair of electrode portions 11 come into contact with each other, the current flows into the cylindrical portion 25 (terminal 24). Flows between the electrode contact portions 14 (between the electrode portions 11). As a result, according to the present embodiment, since the heating can be stopped when the workpiece (cylindrical portion 25) has a desired shape, the resistance welding that can make the workpiece to a desired shape. Electrode 10 can be provided.

In addition, according to the present embodiment, since the electrode portion 11 has the relief portion 13 for escaping the cylindrical portion 25 crimped by the crimp portion 12, the tubular portion 25 crimped by the crimp portion 12 is the relief portion. 13, the cylindrical portion 25 is not crushed too much.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above-described embodiment, the electrode 10 including the escape portion 13 that escapes the tubular portion 25 that has been crimped by the crimp portion 12 has been described. However, the electrode 10 may not include the escape portion.
(2) In the above embodiment, the electrode 10 including the relief portions 13 on both sides of the crimping portion 12 is shown. However, the relief portion may be provided on one side of the crimping portion.
(3) In the above-described embodiment, the electrode 10 is shown in which the cylindrical portion 25 having the shape shown in FIG. 7 is obtained, but the shape of the cylindrical portion 25 is not limited to this. You may set the shape of a crimping | compression-bonding part or a relief part so that an elliptical or rectangular cylindrical part may be obtained.

DESCRIPTION OF SYMBOLS 10: Electrode for resistance welding 10A: Upper side electrode 10B: Lower side electrode 11: Electrode part 12: Crimp part 13: Escape part 14: Electrode contact part 20: Electric wire with a terminal 21: Electric wire 22: Conductor (exposed conductor)
23: Insulation coating 24: Terminal 25: Tubular part 26: Terminal connection part 26A: Terminal insertion hole

Claims (3)

An electrode for connecting the exposed conductor exposed at the end of the electric wire with the conductor covered with an insulating coating and the cylindrical portion of the terminal having a cylindrical portion inserted through the exposed conductor by resistance welding,
It is made of a material having a resistance value lower than that of the terminal, and has a pair of electrode portions sandwiching a cylindrical portion through which the exposed conductor is inserted,
The electrode part is in contact with the cylindrical part, and a crimping part that crimps the cylindrical part;
The electrode for resistance welding which has an electrode contact part which contacts the other electrode part. 2. The electrode for resistance welding according to claim 1, wherein the electrode part has an escape part that escapes the cylindrical part crimped by the crimp part. 3. The resistance welding according to claim 1 or 2, wherein the exposed conductor exposed at the end of the electric wire whose conductor is covered with an insulating coating, and the cylindrical portion of the terminal having a cylindrical portion through which the exposed conductor is inserted. Wire with terminal obtained by resistance welding using the electrode.

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