JP2013163210A - Electrode for resistance welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode for resistance welding capable of appropriate welding.SOLUTION: An electrode 10 for resistance welding includes a pair of electrodes 21 that sandwiches an exposed core wire 16 exposed at a terminal of a wire 15 consisting of the core wire 16 and an insulating coating 17 coating the core wire. The electrodes 21 have a core wire arrangement part 12 where the exposed core wire 16 is disposed, and an electrode contact part 13 that comes in contact with the other electrode 11, wherein the contact surface of the electrode contact part 13 with the other electrode 11 is covered with an insulating member 24 that consists of an insulating material.

Description

  The present invention relates to an electrode for resistance welding.

  In the end of the electric wire formed by covering the core wire with an insulating coating, the exposed core wire is connected to the exposed core wire at the terminal or other electric wire end 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 by sandwiching a connection (for example, an exposed core wire of a wire and a terminal) 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 surface on the opposite surface, there is a concern that welding unevenness or the like may occur due to the displacement of the electric wire, and that appropriate welding cannot be performed.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrode for resistance welding in which appropriate welding is possible.

  As shown in FIGS. 10 and 11, as shown in FIG. 10 and FIG. 11, the concave portion 3 along the outer shape of the core wire 7 and the flat contact portion provided on both edges of the concave portion 3 are used to prevent the positional deviation of the electric wire. 4 was also examined (also referred to as comparative electrode 1).

  When resistance welding is performed using the comparison electrode 1, the core wire 7 is arranged along the recessed portion 3, and the core wire 7 of the electric wire 6 is fixed by the upper electrode 1A and the lower electrode 1B coming into contact with each other. The electric wire 6 is not displaced during welding.

  However, when the electric wire 6 is sandwiched between the comparison electrodes 1, the contact portion 4 at the lower end portion of the upper electrode 1A and the contact portion 4 at the upper end portion of the lower electrode 1B are in direct contact with each other as shown in FIG. An electric current flows between the contact portions 4 and 4 that are in contact at both edges of the portion 3. As a result, it is difficult for current to flow through the core wire 7 of the electric wire 6 disposed in the recessed portion 3, and appropriate welding may not be performed.

As a result of further studies, the present invention has been reached.
That is, the present invention includes a pair of electrode portions sandwiching an exposed core wire exposed at an end of an electric wire whose core wire is covered with an insulation coating, the electrode portion including a core wire arrangement portion on which the exposed core wire is disposed, and the other of the above An electrode contact portion in contact with the electrode portion, and a contact surface of the electrode contact portion with the other electrode portion is an electrode for resistance welding covered with an insulating member made of an insulating material.

  In the present invention, since the electrode portion has a core wire arrangement portion where the exposed core wire is disposed and an electrode contact portion that contacts the other electrode portion, when the exposed core wire is sandwiched between a pair of electrode portions, While the exposed core wire is disposed in the core wire arrangement portion of the electrode portion, the pair of electrode portions are electrode contact portions and contact each other. Therefore, in this invention, since an exposed core wire is fixed to a core wire arrangement | positioning part, an electric wire does not shift | deviate easily at the time of welding.

  In the present invention, since the contact surface of the electrode contact portion with the other electrode portion is covered with an insulating member, an energization current flows in the wire contact portion where the pair of electrode portions contact during resistance welding. However, in the core wire placement portion, an energization current flows from one electrode portion to the other electrode portion via the exposed core wire. When the energization current flows, the metal wires constituting the core wire are welded to each other. That is, according to the present invention, it is possible to supply a current to the portion to be welded while preventing the electric wire from shifting, and thus it is possible to provide an electrode for resistance welding capable of appropriate welding.

The present invention may have the following configurations.
The electrode contact portion may be formed on both edges of the electrode portion with the core wire arrangement portion interposed therebetween.
With such a configuration, the electrode contact portions are disposed on both edges of the core wire disposed in the core wire placement portion, so that the exposed core wire can be reliably held.

The core wire placement portion may have a shape along the exposed core wire.
With such a configuration, the contact area between the core wire arrangement portion and the exposed core wire is increased, and a current can flow over the entire area of the exposed core wire, so that uneven welding can be eliminated.

  ADVANTAGE OF THE INVENTION According to this invention, the electrode for resistance welding which can be appropriately welded can be provided.

The perspective view of the electrode of Embodiment 1 Front view of electrode Front view showing a state in which an electric wire is arranged between a pair of electrodes Front view showing a state where an electric wire is held between a pair of electrodes The perspective view which shows a mode that the electric wire was clamped by a pair of electrode The perspective view of the electrode of Embodiment 2. The perspective view which shows a mode that the electric wire was clamped by a pair of electrode Front view showing a state where an electric wire is held between a pair of electrodes Perspective view showing the wire after welding Front view of reference electrode Front view showing welding of electric wire with reference electrode

<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. 5 is the front and the right side is the rear. The vertical direction is based on each figure.
The electrode 10 according to 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 chromium copper, and includes an electrode portion 11 and a columnar electrode holding portion 18 that holds the electrode portion 11.

  As shown in FIGS. 1 and 2, the pair of electrode portions 11 includes a core wire placement portion 12 that is recessed in a half-moon shape, and portions 13 and 13 that are formed on both edges of the core wire placement portion 12 and have a flat plane shape. .

  As shown in FIG. 2, the core wire arranging portion 12 has a front arc shape, and has a shape along the shape of the exposed core wire 16 exposed at the end of the electric wire 15 (see FIG. 4).

  Flat-shaped portions 13 and 13 formed on both edges of the core wire arrangement portion 12 are electrode contact portions 13 that are in contact with the other electrode portion 11 as shown in FIG. As shown in FIG. 3, the upper end surface of the electrode contact portion 13 of the lower electrode 11B and the lower end surface of the electrode contact portion 13 of the upper electrode 11A are each covered with an insulating member 14 made of an insulating material.

  The insulating member 14 is made of an insulating material such as ceramic and has a heat resistant temperature that does not melt by resistance welding. The insulating member 14 has a plate shape, and is formed to cover the lower end surface of the electrode portion 11 of the upper electrode 1A and the upper end surface of the electrode portion 11 of the lower electrode 1B by a method such as PVD coating.

  Next, a welding method using the resistance welding electrode 10 of the present embodiment will be described. The insulation coating 17 at the terminal of the electric wire 15 is peeled and removed to expose the core wire 16 (exposed core wire 16). The electric wire 15 to be welded by the electrode 10 according to the present embodiment is not particularly limited. For example, the electric wire 15 formed by coating a core wire 16 made of a twisted wire made of aluminum or aluminum metal strands with an insulating coating 17. Etc. can be used.

  Next, the exposed core wire 16 exposed at the end of the electric wire 15 is placed in the core wire placement portion 12 of the lower electrode 10B or the core wire placement portion 12 of the upper electrode 10A.

  Next, as shown in FIGS. 4 and 5, the pair of electrodes 10A and 10B are moved in the approaching direction so that the lower end surface of the electrode contact portion 13 of the upper electrode 10A and the electrode contact portion 13 of the lower electrode 10B are The exposed core wire 16 is sandwiched between the pair of electrode portions 11 in contact with the end surface. When the electrode contact portion 13 of the upper electrode 10A and the electrode contact portion 13 of the lower electrode 10B are brought into contact with each other, as shown in FIGS. 4 and 5, the exposed core wire 16 of the electric wire 15 becomes the core wire placement portion 12. The electric wire 15 is held by the pair of electrode portions 11.

  Next, when resistance welding is performed by passing a current between the pair of electrode portions 11, the contact surface of the electrode contact portion 13 with the other electrode portion 11 is covered with the insulating member 14. In the core contact portion 12, an energization current flows from one electrode portion 11 to the other electrode portion 11 via the exposed core wire 16, although the electrode contact portion 13 in contact with the electrode does not flow. And the metal strand which comprises the core wire 16 is mutually weld-connected by current supply.

Next, the effect of this embodiment will be described.
In this embodiment, since the electrode part 11 has the core wire arrangement | positioning part 12 in which the exposed core wire 16 is arrange | positioned, and the electrode contact part 13 which contacts the other electrode part 11, it exposes the exposed core wire 16 to a pair of electrodes. When sandwiched between the portions 11, the exposed core wire 16 is disposed on the core wire placement portion 12 of the electrode portion 11, while the pair of electrode portions 11 are in contact with each other at the electrode contact portion 13. Therefore, according to this embodiment, since the exposed core wire 16 is fixed to the core wire placement portion 12, the electric wire 15 is not easily displaced when welding.

  Moreover, in this embodiment, since the contact surface with the other electrode part 11 of the electrode contact part 13 is covered with the insulating member 14, the electrode contact part 13 which contacts the other electrode part 11 in the case of resistance welding. No current flows, and current flows between the electrode portions 11 in the core wire arrangement portion 12 of the electrode portion 11. That is, according to the present embodiment, it is possible to supply a current to a portion to be welded while preventing the electric wire 15 from being displaced, and thus it is possible to provide the electrode 10 for resistance welding capable of appropriate welding.

  Moreover, according to this embodiment, since the electrode contact part 13 is formed in the both edges of the electrode part 11 on both sides of the core wire arrangement | positioning part 12, it is formed in the both edges of the core wire 16 arrange | positioned in the core wire arrangement | positioning part 12. The electrode contact part 13 is arranged and the exposed core wire 16 can be reliably held.

  Furthermore, according to this embodiment, since the core wire placement portion 12 has a shape along the exposed core wire 16, the contact area between the core wire placement portion 12 and the exposed core wire 16 increases, and a current flows through the entire area of the exposed core wire 16. Therefore, uneven welding can be eliminated.

<Embodiment 2>
Next, the resistance welding electrode 20 according to the second embodiment of the present invention will be described with reference to FIGS. The electrode 20 of the present embodiment is different from the first embodiment in the shape of the electrode portion 21. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In the following description, the left side in FIGS. 7 and 9 is the front and the right side is the rear. The vertical direction is based on each figure.

  As shown in FIGS. 7 and 8, the electrode 20 of the present embodiment is composed of two electrodes 20 </ b> A and 20 </ b> B arranged up and down. The electrode 20A disposed on the upper side is referred to as an upper electrode 20A, and the electrode 20B disposed on the lower side is referred to as a lower electrode 20B.

  The electrode portion 21 includes a pair of side surfaces 21A having a mountain shape and a groove-shaped core wire arrangement portion 22 formed between the pair of side surfaces 21A and where the exposed core wire 16 of the electric wire 15 is arranged.

  On the side surface 21 </ b> A of the electrode portion 21, an electrode contact portion 23 that protrudes outward and contacts the other electrode portion 21 is formed. As shown in FIGS. 6 and 8, the inner wall of the core wire arranging portion 22 has a shape in which the central portion protrudes outward as in the case of the side surface.

  The upper end surface of the side surface of the electrode portion 21 of the lower electrode 20B and the lower end surface of the side surface of the electrode portion 21 of the upper electrode 20A are each covered with an insulating member 24. That is, the electrode contact portion 23 of each electrode portion 21 is covered with the insulating member 24.

  Next, a welding method using the resistance welding electrode 20 of the present embodiment will be described. The insulation coating 17 at the end of the electric wire 15 is peeled and removed to expose the core wire 16, and the exposed core wire 16 exposed at the end of the electric wire 15 is replaced with the core wire arrangement portion 22 of the lower electrode 20B and the core wire of the upper electrode 20A. It arrange | positions between the arrangement | positioning parts 22 (refer FIG. 7 and FIG. 8).

  Next, as shown in FIGS. 7 and 8, the pair of electrodes 20A and 20B are moved in the approaching direction so that the lower end surface of the electrode contact portion 23 of the upper electrode 20A and the electrode contact portion 23 of the lower electrode 20B are The exposed core wire 16 is sandwiched between the pair of electrode portions 21 in contact with the end surface. When the electrode contact portion 23 of the upper electrode 20A and the electrode contact portion 23 of the lower electrode 20B are brought into contact with each other, as shown in FIGS. 7 and 8, the exposed core wire 16 of the electric wire 15 becomes the core wire placement portion 22. And the electric wire 15 is held by the pair of electrode portions 21.

  Next, resistance welding is performed by passing an electric current between the pair of electrode portions 21. At this time, since the contact surface of the electrode contact portion 23 with the other electrode portion 21 is covered with the insulating member 24, an energization current does not flow in the electrode contact portion 23 where the pair of electrode portions 21 contact, but the core wire In the arrangement portion 22, an energization current flows from one electrode portion 21 to the other electrode portion 21 via the exposed core wire 16. And the metal strand which comprises the core wire 16 is mutually weld-connected by current supply. In the electric wire 15 obtained in this way, as shown in FIG. 9, a narrow portion 19 having a width dimension smaller than other portions is formed in a substantially central portion. In the portion where the narrow portion 19 of the electric wire 15 is formed, the energizing current flows particularly at the time of welding, so that the metal wires are securely connected to each other. Other configurations are substantially the same as those of the first embodiment.

Next, the effect of this embodiment will be described.
In the present embodiment, the electrode portion 21 has a core wire placement portion 22 where the exposed core wire 16 is disposed and an electrode contact portion 23 that contacts the other electrode portion 21, so that the exposed core wire 16 is a pair of electrodes. When sandwiched between the portions 21, the exposed core wire 16 is disposed on the core wire placement portion 22 of the electrode portion 21, while the pair of electrode portions 21 are in contact with each other at the electrode contact portion 23. Therefore, according to this embodiment, since the exposed core wire 16 is fixed to the core wire placement portion 22, the electric wire 15 is not easily displaced when welding.

  Moreover, in this embodiment, since the contact surface with the other electrode part 21 of the electrode contact part 23 is covered with the insulating member 24, the electrode contact part 23 which a pair of electrode part 21 contacts in the case of resistance welding is carried out. Current does not flow, and current flows between the electrode portions 21 in the core wire arrangement portion 22 of the electrode portion 21. That is, according to the present embodiment, it is possible to supply a current to a portion to be welded while preventing the electric wire 15 from being displaced, and thus it is possible to provide the resistance welding electrode 20 capable of appropriate welding.

  Moreover, according to this embodiment, since the electrode contact part 23 is formed in the both edges of the electrode part 21 on both sides of the core wire arrangement | positioning part 22, it is formed in the both edges of the core wire 16 arrange | positioned in the core wire arrangement | positioning part 22. The electrode contact part 23 is arranged and the exposed core wire 16 can be reliably held.

<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 electric wire 15 is one in which the core wire 16 made of a twisted wire obtained by twisting together aluminum or aluminum alloy metal strands is covered with the insulating coating 17. It may be formed by covering a core wire made of a twisted wire in which metal wires made of copper or copper alloy are combined with an insulating coating.
(2) In the above-described embodiment, the configuration in which both of the pair of electrode portions 11 include the electrode contact portion 13 covered with the insulating member 14 is shown. However, the electrode contact portion in which only one electrode portion is covered with the insulating member is shown. The structure which is provided may be sufficient.

DESCRIPTION OF SYMBOLS 10,20 ... Electrode for resistance welding 10A, 20A ... Upper electrode 10B, 20B ... Lower electrode 11, 21 ... Electrode part 12, 22 ... Core wire arrangement | positioning part 13, 23 ... Electrode contact part 14 ... Insulation member 15 ... Electric wire 16 ... core wire (exposed core wire)
17 ... Insulation coating

Claims (3)

A pair of electrode portions sandwiching the exposed core wire exposed at the end of the electric wire whose core wire is covered with an insulating coating,
The electrode portion has a core wire placement portion on which the exposed core wire is disposed, and an electrode contact portion in contact with the other electrode portion,
An electrode for resistance welding, wherein a contact surface of the electrode contact portion with the other electrode portion is covered with an insulating member made of an insulating material. The electrode for resistance welding according to claim 1, wherein the electrode contact portion is formed on both edges of the electrode portion with the core wire arrangement portion interposed therebetween. The electrode for resistance welding according to claim 1, wherein the core wire placement portion has a shape along the exposed core wire.

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