JPH11245045A - Electrode constituted unit for resistance welding and resistance welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a time required for a welding work and save a consumable electricity as well at the time of welding when joining a wired material such as an electric wire and the like composed of the twisted plural wiring material. SOLUTION: An electrode constituted unit for a resistance welding is composed of the plural number of upper side electrodes 2, 3, lower side electrodes and a holding member to be fixed with the lower electrodes. The holding member is made by connecting the opposed holding piece parts 12, 13 with the connecting piece part, and the plural number of wire material inserting groove parts 16, 17 are formed at the top end part of the holding piece parts 12, 13. The holding members are fixed with the lower side electrodes by inserting a protruded part 10 of the lower electrodes 4 between the holding piece part 12, 13 of the holding member 5. The plural wire materials are clamped by the plural number of the upper electrodes 2, 3 and the lower electrodes, and an electric current is flowed between the plural number of the upper electrodes 2, 3 and the lower electrodes with a given time interval or an electric current is flowed from the upper electrode 3 of one side to the upper electrode 2 of the other side via a lower electrode to make a joining of the plural wire materials.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode assembly for resistance welding suitable for use in resistance welding of linear materials such as electric wires, resistance wires, and heating wires. The present invention relates to a resistance welding method using the same.

[0002]

2. Description of the Related Art In a resistance welding method in which a material to be joined is joined by supplying an electric current to the material to be heated and applying a pressure to the joint, the temperature of the joint is relatively low. Since the affected part is small, the material to be joined is difficult to deform,
The residual stress generated in the material to be joined is small. Moreover, since it is easy to automate, it is suitable for mass production of metal parts. Among them, the polymerized material to be joined is held at the tip of the electrode,
Spot welding, in which a current is supplied locally to heat and at the same time a pressure is applied by an electrode, is widely used.
When a wire material such as an electric wire, a resistance wire, and a heating wire is spot-welded, conventionally, the tip of the wire material constituting the wire material is overlapped and held by a holding member, and current is applied by the electrode. Supply and heat and apply pressure,
The linear material was joined.

[0003]

However, conventionally, when a linear material such as an electric wire, a resistance wire, a heating wire, etc., in which a plurality of wires are twisted, is spot-welded, the holding members are sequentially used. The ends of each wire were superimposed and held, and current had to be supplied and pressure was applied by the electrodes, which required a long time for the welding operation and also required a large power consumption for welding.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to use a wire material such as an electric wire, a resistance wire, a heating wire or the like obtained by twisting a plurality of wires. It is also an object of the present invention to provide a resistance welding electrode structure and a resistance welding method using the same, which can shorten the time required for welding work and also reduce the power consumption during welding when joining. .

[0005]

In order to achieve the above object, the present invention provides a plurality of upper electrodes, a lower electrode, and a plurality of wire rods which are fixed to the lower electrode and into which a wire to be joined can be inserted. An electrode structure for resistance welding is constituted by a holding member having a groove.

Here, it is assumed that the holding member is formed by connecting opposing holding pieces by connecting pieces. The plurality of wire insertion grooves are formed at the upper end of the holding piece, and the plurality of upper electrodes are formed. A projecting portion that can be inserted between the holding pieces is formed at a lower end portion, a projecting portion that can be inserted between the holding pieces is formed in an upper half of the lower electrode, and the projecting portion of the lower electrode is a holding member. Preferably, the holding member is fixed to the lower electrode by being inserted between the holding pieces.

When the holding member is fixed to the lower electrode, the upper surface of the projecting portion of the lower electrode is made substantially flush with the bottom surface of the wire insertion groove of the holding member. This is preferable because it can be placed in a substantially horizontal state and does not break or break.

Further, if the plurality of upper electrodes have the same shape and are in contact with each other via an insulating member, the manufacturing cost can be reduced, and the lifting mechanism for driving the upper electrodes is the same as the conventional one. It is preferable to use one.

[0009] The present invention also relates to a resistance welding method using the electrode structure for resistance welding, wherein the first is to hold a plurality of wires by a plurality of upper electrodes and a lower electrode; A predetermined time difference is provided to the upper electrode to apply a voltage, a predetermined time difference is provided between the plurality of upper electrodes and the lower electrode, a current flows, and the plurality of wires are joined. .

Second, a plurality of wires are sandwiched between a plurality of upper electrodes and lower electrodes, a predetermined potential difference is provided between the plurality of upper electrodes, and a voltage is applied. A current flows through the side electrode to the other upper electrode to join the plurality of wires.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an electrode assembly for resistance welding according to the present invention will be described below in detail with reference to the drawings. The electrode assembly 1 for resistance welding is, as shown in FIG.
It comprises upper electrodes 2 and 3, lower electrode 4 and holding member 5.

The upper electrodes 2 and 3 are made of copper containing
Chromium copper containing 1.0% by weight, having a hardness of 85-1
As shown in FIG. 2, a bar having a characteristic of 05Hv and a conductivity of 80 to 84% IACS is cut into a predetermined shape. The upper electrodes 2 and 3 have a cross section of about 1 bar.
/ 4 are cut off and the contact surfaces 6, 7 parallel to the axis of the bar
To form a, it is formed with the contact surface 6 parallel to the contact surface 8 at a distance W ₁ between the axis of the bar. Further, the lower end of the bar is cut off to form a projection 9 having a width W ₁ and a height H ₁ .

The lower electrode 4 is made of copper containing chromium in the range of 0.5 to 1.
Chromium copper containing 0% by weight and having a hardness of 85 to 105
As shown in FIG. 3, a bar having characteristics of Hv and a conductivity of 80 to 84% IACS is cut into a predetermined shape. The lower electrode 4 cuts off the upper half of the bar,
A projection 10 having a width W ₂ and a height H ₂ is formed;
The projecting portion 10 has a long hole 11 formed therein.

As shown in FIG. 4, the holding member 5 is formed by cutting a bar made of stainless steel into a predetermined shape. The holding member 5 includes the holding pieces 1 opposed in parallel.
2,13 is obtained by connecting the connecting piece 14, distance between the holding pieces 12 and 13 are as W _3. The holding pieces 12 and 13 are provided with a mounting hole 15 at the lower side and wire insertion grooves 16 and 17 at the upper end. The width of the wire insertion grooves 16 and 17 is W. ₄ , width is W
The a is part of the depth ₄ and D _4, certain height from the lower end surface of the holding pieces 12, 13 to the bottom surface of the wire insertion groove 16, 17 as H _4.

[0015] In the above, the width W ₂ of width W ₁ and the projection 10 of the projecting portion 9, as slightly smaller than the distance W ₃ between the holding pieces 12, 13, holding pieces protrusions 9 and the projection 10 1
It can be inserted between 2 and 13. The width W ₄ of the wire rod insertion grooves 16, 17 is slightly larger than the diameter φ of the wire rod to be joined, and the depth D ₄ is twice or more the diameter φ of the wire rod, and a plurality of wire rods are inserted into the wire rod insertion groove parts 16, 17. It can be inserted inside. The height H ₂ of the protrusion 10 is substantially the same as the height H ₄ from the lower end surfaces of the holding pieces 12 and 13 to the bottom surfaces of the wire insertion grooves 16 and 17, that is, the holding member 5 is connected to the lower electrode 4. , The upper surface of the projecting portion 10 is substantially flush with the bottom surfaces of the wire insertion grooves 16 and 17.
Therefore, the wire can be placed in a substantially horizontal state, and there is no breakage, cutting, or the like.

The electrode assembly 1 for resistance welding according to the present invention is configured as described above. The wire is spot-welded in the following manner to form an electric wire having a plurality of wires stranded, a resistance wire. Wire materials such as wires and heating wires are joined. In the following, an electric wire obtained by twisting two wires is referred to as a spot.
The case of joining by welding will be described.

As shown in FIG. 1, a contact surface 6 of the upper electrode 2, a contact surface 8 of the upper electrode 3, and a contact surface 7 of the upper electrode 2 are formed in advance.
And the contact surface 7 of the upper electrode 3 are in contact with each other via an insulating member (not shown) such as an insulating tape or the like, and the upper ends of the upper electrodes 2 and 3 are supported by a lifting unit (not shown). And fix it. Here, as the insulating tape, for example, an insulating tape having high heat resistance such as tetrafluoroethylene or silicon resin can be used. Since the upper electrodes 2 and 3 have the same shape and are in contact with each other via the insulating member, two parts having the same shape can be manufactured. Since the manufacturing cost of the upper and lower electrodes 2 and 3 can be reduced and the upper electrodes 2 and 3 can be raised and lowered at the same time, the same lifting and lowering mechanism for driving the upper electrodes 2 and 3 can be used.

On the other hand, as shown in FIG. 1, an insulating member (not shown) such as an insulating tape is attached to the protruding portion 10 of the lower electrode 4 and the holding pieces 12 and 13 of the holding member 5 are attached. The protrusion 10 of the lower electrode 4 is inserted between the mounting hole 15 and the long hole 1.
1, a bolt 18 is inserted and tightened with a nut 19, the holding member 5 is fixed to the lower electrode 4, and the lower end of the lower electrode 4 is attached and fixed to a support portion of a fixing device (not shown). .
Here, as the insulating tape, similarly to the above, an insulating tape having high heat resistance such as tetrafluoroethylene or silicon resin can be used.

First, as shown in FIG. 5, the distal ends of the wires 20a, 20b, which are the cores of one of the electric wires 20, are inserted into the wire insertion grooves 16, 17 of the holding piece 13, and the projecting portions of the lower electrode 4 are formed. 10 on the top surface. The wire rod 2 which is the core of the other electric wire 21 is inserted into the wire rod insertion grooves 16 and 17 of the holding piece 12.
1a and 21b are inserted, and the wire 20 of the electric wire 20 is inserted.
a, 20b.

Next, as shown in FIG. 6, the lifting device (not shown) is driven to lower the upper electrodes 2, 3, and the lower surfaces of the protruding portions 9, 9 of the upper electrodes 2, 3 are connected to the electric wires. 21 are brought into contact with the distal ends of the wires 21a and 21b. Then, a voltage is applied to the upper electrodes 2 and 3 and the lower electrode 4 to locally supply current to the wires 20 a and 20 b of the electric wire 20 and the wires 21 a and 21 b of the electric wire 21 to heat them. ,
3 is further lowered slightly, and electric wires 2 are
0 of wire 20a, 20b and wire 21a, 2 of electric wire 21
Pressure is applied to 1b, and spot welding is performed.

In the first resistance welding method according to the present invention, when a voltage is applied between the upper electrodes 2 and 3 and the lower electrode 4, FIG.
As shown in (A), a predetermined time difference is provided to set the upper electrodes 2 and 3 to a positive potential or a negative potential, and a predetermined time difference is provided between the upper electrodes 2 and 3 and the lower electrode 4 to flow a current. According to such a resistance welding method, since a large current is not circulated at a time, the same power supply device as that used when spot welding a single wire can be used. It is to be noted that one power supply device may be switched and used without preparing a power supply device for each of the upper electrodes 2 and 3.

In the second resistance welding method of the present invention, as shown in FIG. 7B, the upper electrode 3 is set to a positive potential or a negative potential, and the upper electrode 2 is set to a negative potential or a positive potential.
The upper electrode 3 and the upper electrode 2 are set to a positive potential or a negative potential, a predetermined potential difference is provided between the two, and a current flows from the upper electrode 3 to the upper electrode 2 via the lower electrode 4 or in the opposite direction. . According to such a resistance welding method, each core of an electric wire composed of two cores can be simultaneously welded.

Although the case where the electric wire in which two wires are twisted is spot-welded has been described above, in the resistance welding electrode assembly 1 and the resistance welding method of the present invention, a plurality of wires are twisted. Of course, the present invention can be applied to electric wires, and can also be applied to linear materials other than electric wires, such as resistance wires and heating wires.

Further, the materials, shapes, positional relationships, and the like of the upper electrodes 2 and 3, the lower electrode 4, and the holding member 5 are not limited to those in the above-described embodiment. Various materials, shapes, positional relationships, and the like can be selected. For example, an insulating member (not shown) such as an insulating tape is attached to the protruding portion 10 of the lower electrode 4 so that the lower electrode 4
Instead of insulating the holding member 5 from the holding member 5, the holding member 5 itself may be formed from an insulating material such as ceramics.

[Brief description of the drawings]

FIG. 1A is a front view and FIG. 1B is a side view of the electrode assembly for resistance welding of the present invention.

2A is a plan view, FIG. 2B is a front view, and FIG.
(C) is a side view.

3A is a plan view, FIG. 3B is a front view, and FIG.
(C) is a side view.

4A is a plan view, FIG. 4B is a front view, and FIG.
(C) is a side view.

FIG. 5 is an explanatory view showing a procedure for performing spot (spot) welding of an electric wire in which a plurality of wires are twisted by the electrode assembly for resistance welding according to the present invention, and (A) in a state where the upper electrode is located above; FIG. 3B is a front view, and FIG.

FIG. 6 is an explanatory view showing a procedure of spot (spot) welding an electric wire in which a plurality of wires are twisted by the resistance welding electrode structure of the present invention, in which the upper electrode is in contact with the wires (A). Is a front view, and (B) is a side view.

7A and 7B are explanatory diagrams showing a resistance welding method and a current flowing direction according to the present invention. FIG. 7A shows a case where a predetermined time difference is provided and each upper electrode is set to a positive potential, and FIG. Is a positive potential and the other upper electrode is a negative potential.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode assembly for resistance welding 2, 3 Upper electrode 4 Lower electrode 5 Holding member 9 Projection part 10 Projection part 12, 13 Holding piece part 14 Connection piece part 16, 17 Wire insertion groove part 20a, 20b, 21a, 21b Wire rod

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[Procedure amendment]

[Submission date] March 3, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01R 43/02 H01R 43/02 B

Claims (6)

[Claims] An electrode configuration for resistance welding comprising a plurality of upper electrodes, a lower electrode, and a holding member fixed to the lower electrode and formed with a plurality of wire insertion grooves into which wires to be joined can be inserted. body. 2. The holding member, wherein opposing holding pieces are connected by a connecting piece. The plurality of wire insertion grooves are formed at an upper end of the holding piece, and the plurality of upper electrodes are connected to each other. A projecting portion that can be inserted between the holding pieces is formed at a lower end portion, a projecting portion that can be inserted between the holding pieces is formed in an upper half of the lower electrode, and the projecting portion of the lower electrode is a holding member. The electrode assembly for resistance welding according to claim 1, wherein the holding member is fixed to the lower electrode by being inserted between the holding pieces. 3. When the holding member is fixed to the lower electrode, an upper surface of a projecting portion of the lower electrode is substantially flush with a bottom surface of a wire insertion groove of the holding member. The electrode assembly for resistance welding according to claim 1. 4. The electrode assembly for resistance welding according to claim 1, wherein the plurality of upper electrodes have the same shape and are in contact with each other via an insulating member. 5. A method in which a plurality of wires are sandwiched between a plurality of upper electrodes and a plurality of lower electrodes, a voltage is applied to the plurality of upper electrodes with a predetermined time difference, and the plurality of upper electrodes and the lower electrode are connected to each other. A resistance welding method, characterized in that a current is circulated with a predetermined time difference between the wires and the wires are joined. 6. A plurality of wires are sandwiched between a plurality of upper electrodes and a lower electrode, a predetermined potential difference is provided between the plurality of upper electrodes, a voltage is applied, and one lower electrode is connected to the lower electrode. Current flowing to the other upper electrode via the first electrode and joining the plurality of wires.