JP2002178163A - Welding method, welding equipment and welding electrode part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress wear of both electrode surfaces. SOLUTION: In a welding method, welding equipment, and an electrode part for welding, an insulating cap 14 formed of an electric insulator is placed over a lower electrode surface 13a, a groove 15 is provided in this cap 14, only the central part C of the lower electrode surface 13a is exposed as a part required for the welding work at a bottom opening part of the groove 15 while other parts D and D are covered for insulation, and an superposed contact part of stranded ends 11a and 11a is held between a tip surface 16a of a projecting part 16 provided on an upper electrode surface 12a and the center part C of the lower electrode surface to perform welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method, a welding apparatus and a welding electrode portion suitable for welding thin wires (especially stranded wires) such as electric wires and thin plates.

[0002]

2. Description of the Related Art Conventionally, in order to introduce a stranded wire into a processing machine such as a terminal attaching machine, as a method of connecting an end of a processed covered stranded wire and a starting end of a stranded wire before processing, a connection operation is performed. A welding method is known which has a high efficiency and does not cause an excessively large wire diameter in a connected state.

In this known welding method, FIGS.
2, the stripped ends 1a, 1a of the two stranded wires 1, 1 to be connected are brought into contact with each other in a superposed state,
A welding current is applied in a state where the contact portion is sandwiched between the electrode surfaces 2a and 3a of a pair of electrodes (upper and lower electrodes, hereinafter referred to as an upper electrode and a lower electrode) 2 and 3 constituting an electrode portion. A method is used in which the contact portion is melted and fused by the welding heat.

[0004]

Here, the stranded wire contact portion is disposed at the center portion A of both electrode surfaces 2a and 3a as shown in FIG. 12, and only this electrode surface center portion A is actually welded. It is a part necessary for the work, and the other parts (both sides on the electrode surface) B, B are parts that help to set the stranded wire contact part at the welding position (hereinafter, the welding work is performed on the center part A of the electrode surface). Part, both side parts B, B are called welding auxiliary parts).

However, according to the known welding method, especially when the welding portion A on both electrode surfaces 2a, 3a is worn by welding heat or the like and the distance between the electrode surfaces is shortened, the welding auxiliary portions B, B are worn. There was a problem of becoming intense.

This is presumably because the distance between the welding auxiliary portions B, B is shortened, and discharge is rapidly generated between them as shown by arrows in the figure.

For this reason, the life of the entire electrodes 2 and 3 is shortened, and the electrodes 2 and 3 have to be replaced in a short cycle.

Accordingly, the present invention provides a welding method, a welding apparatus, and a welding electrode portion capable of suppressing wear of both electrode surfaces.

[0009]

According to the invention (welding method) of the present invention, a part of both workpieces to be welded is brought into contact with each other, and the contact portion is sandwiched between electrode surfaces of a pair of electrodes. A welding method in which at least one of the two electrode surfaces is electrically insulated and coated except for a portion required for a welding operation.

The invention (welding apparatus) according to a second aspect of the present invention is a welding apparatus for bringing two workpieces to be welded into contact with each other, and welding the contacted portion between the electrode surfaces of a pair of electrodes. , At least one of the two electrode surfaces,
It is electrically insulated and covered except for the parts required for the welding operation.

According to a third aspect of the present invention, in the configuration of the second aspect, a groove is provided on one electrode surface side, and a convex portion which fits into the groove and sandwiches a workpiece contact portion is provided on the other electrode surface side. At least the bottom surface of the groove and the tip surface of the projection are left as portions required for welding work, and the electrode surface is electrically insulated.

According to a fourth aspect of the present invention, in the configuration of the second or third aspect, an insulating portion is formed by covering an electrode surface with an insulating cap made of an electrical insulator.

According to a fifth aspect of the present invention (welding electrode portion), at least one of the electrode surfaces of the pair of electrodes is electrically insulated and covered except for a portion required for welding work. .

According to a sixth aspect of the present invention, in the configuration of the fifth aspect, at least one of the electrode surfaces of the pair of electrodes is electrically insulated and coated except for a portion required for welding. is there.

According to a seventh aspect of the present invention, in the configuration of the sixth aspect, a top wall of the insulating cap covering one of the electrode surfaces is provided.
A groove for exposing a central portion of the electrode surface is provided, and a convex portion that fits into the groove and sandwiches a workpiece contact portion is provided on the other electrode surface.

According to the above-described method, apparatus and welding electrode portion, a portion (welding auxiliary portion) other than a portion required for welding work (welding work portion) on the electrode surfaces of both electrodes is electrically insulated and coated. Since the welding operation is performed, the electric action at the welding auxiliary portion on both electrode surfaces is prevented.

Therefore, since the discharge phenomenon does not occur in the welding auxiliary part (this has been clarified by the experiment of the inventor), it is necessary to suppress the wear of the same part, that is, the wear of the whole electrode, and to prolong the life of the electrode. It becomes possible.

Here, the welding work portion and the exceptional portion on both electrode surfaces (hereinafter referred to as a welding auxiliary portion in accordance with the description of the prior art) set the width of the electrode surface and set the workpiece between the electrode surfaces. Various settings can be made in consideration of workability in the case and the like.

According to the third and seventh aspects of the present invention, the protrusion provided on the other electrode surface side is fitted into the groove provided on the one electrode surface side, and a contact portion of a workpiece is provided between the grooves. Therefore, the workpiece can be easily and accurately set on the welding work portion (at least the bottom surface of the groove and the end surface of the convex portion).

Further, according to the constitution of the fourth or sixth aspect of the present invention, the insulating surface is formed by covering the electrode surface with an insulating cap made of an electrical insulator. 2) In comparison with the case, the insulating coating work is easy and the cost is low, and even when the insulating coating portion is worn out, it is possible to easily repair by replacing only the insulating cap.

[0021]

1 to 10 show an embodiment of the present invention.
It will be explained by.

Basic Embodiment (See FIGS. 1 to 6) In each figure, 11 and 11 are stranded wires as workpieces to be welded, 12 is an upper electrode, and 13 is a lower electrode.

The electrode surface 13a of the lower electrode 13 is covered with an insulating cap 14 made of an electric insulator (for example, ceramic).

The insulating cap 14 has a groove 15 having an open bottom surface at the center of the top wall 14a. As shown in FIGS. 3 to 6, the cap 14 covers the lower electrode surface 13a. The central portion C of the electrode surface 13a is exposed to the outside from the bottom opening of the groove 15.

That is, the lower electrode surface 13a has a central portion C exposed to the outside, a welding portion, and other portions D, D
Is a welding auxiliary part which is insulated and covered by the insulating cap 14 and is not directly involved in welding.

On the other hand, on the electrode surface 12a of the upper electrode 12,
At the center, a rectangular parallelepiped convex portion 16 that fits into the groove 15 on the lower electrode side is integrally formed to project downward.

As shown in the figure, the overlapping contact portions of the two stranded wire ends 11a, 11a are provided in the grooves 15 with the tip surfaces (hereinafter referred to as welding work surfaces) 16 of the projections 16 on the upper electrode side.
a and the welding portion C of the lower electrode surface 13a, and is welded by a welding current flowing therebetween.

At this time, since the welding auxiliary portions D, D of the lower electrode surface 13a are electrically insulated by the insulating cap 14, the welding auxiliary portions D, D and the upper electrode surface 1
No electrical action is performed between the portions other than the welding work surface 16a in 2a.

Incidentally, according to an experiment conducted by the inventor,
No discharge phenomenon occurred in the insulating portion, and no wear of the electrode surface occurred.

Further, by simply inserting the contact portions of the stranded wire ends 11a, 11a into the grooves 15, the contact portions are connected to both electrode surfaces 1a.
It can be easily and accurately set at a predetermined welding position between the welding working portions 2a and 13a.

The insulating cap 14 is provided on the lower electrode surface 1.
3a is detachably attached to 3a, and can be replaced as necessary such as deterioration.

Other Embodiments (1) As shown in FIG. 7, a groove 17 is provided at the center of the lower electrode surface 13a, and a portion other than the bottom surface 17a of the groove 17 is insulated and covered with an insulating cap 14. Good.

(2) Assuming the electrode configuration of FIG. 7, FIG.
As shown in (1), the insulating cap 14 may be attached to the upper electrode 12 in a state where the insulating cap 14 is insulated and covered except for the welding work surface 16a.

(3) Contrary to the basic embodiment, as shown in FIG. 9, an insulating cap 1 having a groove 15 on an upper electrode surface 12a is provided.
4 and the projection 16 projecting from the lower electrode surface 13a is
5 and may be configured to be welded.

In this case, the central portion E of the upper electrode surface 12a serves as a welding work portion, and both side portions F, F serve as welding auxiliary portions.

The contact portions of the stranded wire ends 11a, 11a may be set on the groove 15 side,
6 may be set on the front end face 16a. Further, the upper electrode 12 may be lowered toward the lower electrode 13 as an operation of sandwiching the contact portion between the ends of the stranded wires between the convex tip surface 16a and the welding work surface E of the upper electrode surface 12a. On the contrary, the lower electrode 13 may be raised toward the upper electrode 12.

(4) As shown in FIG.
3a (which may be the upper electrode surface 12a) is covered with an insulating cap 14 having a shallow groove 15, and a stranded wire end 11a, 1 between the welding work portion C and the upper electrode surface 12a having no projection.
A configuration in which the contact portion 1a is sandwiched and welded may be adopted.

(5) In each of the above embodiments, the configuration is such that only one electrode surface is covered with an insulating cap. However, the configuration may be such that both electrode surfaces 12a and 13a are covered with an insulating cap if necessary.

(6) In the above embodiments, the electrode surface 12a
Or 13a was covered with an insulating cap,
An electrical insulator may be coated on the electrode surface to be insulated.

(7) In each of the above embodiments, both electrodes 12,
Although the electrodes 13 are arranged vertically, the electrodes 12 and 13 may be arranged horizontally.

(8) In the above embodiment, the coated stranded wire 1
Although only the case where the ends 11a of the first and the eleventh 11a are overlapped with each other and welded is described, the present invention
The present invention can be applied to a case where the end faces of the covered stranded wire ends 11a, 11a are butt-welded to each other, and not only to a stranded wire but also to a single wire or a bare wire. Further, the present invention can be applied not only to electric wires but also to various types of wires and thin plates.

[0042]

As described above, according to the present invention, the welding operation is performed in a state in which portions (welding auxiliary portions) other than the welding operation portion of the electrode surfaces are electrically insulated and coated. The electric action (discharge) at the welding auxiliary portion on the electrode surface can be prevented, and the resulting wear of the electrode can be suppressed and the life thereof can be increased.

According to the third and seventh aspects of the present invention, the protrusion provided on the other electrode surface is fitted into the groove provided on the one electrode surface, and the contact portion of the workpiece is sandwiched between them. Therefore, the workpiece can be easily and simply and accurately set on the welding work portion.

Further, according to the present invention, the insulating surface is formed by covering the electrode surface with an insulating cap made of an electric insulator to form an insulating portion. In comparison with this, the insulating coating work is easier and the cost is lower, and even if the insulating coating part is worn out, the cap can be replaced and easily repaired.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electrode unit showing a basic embodiment of the present invention.

FIG. 2 is a perspective view at the time of welding work by the electrode unit.

FIG. 3 is a front cross-sectional view of the electrode section just before welding.

FIG. 4 is a front sectional view at the time of the welding operation.

FIG. 5 is a side sectional view of the state of FIG. 3;

FIG. 6 is a side sectional view of the state of FIG. 4;

FIG. 7 is a diagram corresponding to FIG. 6, showing one of other embodiments of the present invention.

FIG. 8 is a diagram corresponding to FIG. 6, showing a second embodiment of the present invention.

FIG. 9 is a diagram corresponding to FIG. 6, showing a third embodiment of the present invention.

FIG. 10 is a diagram corresponding to FIG. 6, showing 4 of another embodiment of the present invention.

FIG. 11 is a front sectional view showing a conventional welding method in a state immediately before welding.

FIG. 12 is a side sectional view at the time of the welding operation.

[Explanation of symbols]

 11, 11 stranded wire to be welded 11a, 11a end of stranded wire 12 upper electrode 12a upper electrode surface 16 convex portion of upper electrode surface 16a distal end surface of convex portion 13 lower electrode 13a lower electrode surface C for welding of electrode surface Required parts 14 Insulating cap 15 Insulating cap groove 17 Electrode surface groove 17a Bottom of groove 18 Insulating cap

Claims (7)

[Claims] 1. A part of both workpieces to be welded are brought into contact,
A welding method in which this contact portion is welded while being sandwiched between the electrode surfaces of a pair of electrodes. A welding method characterized in that welding is performed in a state of being welded. 2. A part of both workpieces to be welded are brought into contact,
A welding apparatus for welding in a state where the contact portion is sandwiched between electrode surfaces of a pair of electrodes, wherein at least one of the two electrode surfaces is electrically insulated while leaving a portion required for welding work. Welding equipment characterized by doing. 3. A groove is provided on one electrode surface side, and a convex portion is provided on the other electrode surface side to fit into the groove and sandwich a workpiece contact portion, and at least a bottom surface of the groove and a front end surface of the convex portion are provided. 3. The welding apparatus according to claim 2, wherein the electrode surface is electrically insulated and covered except for a part required for the welding operation. 4. The welding device according to claim 2, wherein an insulating portion is formed by covering an electrode surface with an insulating cap made of an electrical insulator. 5. An electrode portion for welding, wherein at least one of the electrode surfaces of a pair of electrodes is electrically insulated and covered except for a portion required for welding work. 6. The electrode surface is covered with an insulating cap made of an electrical insulator in a state where a portion required for welding work on the electrode surface is exposed. The electrode for welding as described. 7. A groove for exposing a central portion of an electrode surface is provided on a top wall of an insulating cap to be placed on one electrode surface, and a workpiece contact portion is fitted on the other electrode surface by being fitted into the groove. 7. The welding electrode portion according to claim 6, wherein a protruding portion to be sandwiched is provided.