JPH1177330A - Electrode structure of welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To micronize sticking of fused matters as much as possible and to prevent consumption of an electrode by forming the electrode face abutting on an object to be welded correspondingly to its shape and arranging a contact member on the abutting face. SOLUTION: An electrode 10 face abutting on an object W to be welded is formed correspondingly to the object W shape, with a contact member 20 arranged on the face. The contact member 20 is like a piece of cloth in which a conductive wire material is woven in, and organized in such a manner as to fit to the shape of the abutting face, with the attaching part at both ends fixedly screwed on the electrode 10 with a bolt 11. As a result, the object W is held without being in direct contact with the abutting face of the electrode 10. The wire material constituting the contact member 20 is pressurized through the holding by the electrode 10, making an area contact with the object W; therefore, the object W is free from the concentrated power supply on one point. If jewelry is the object W to be welded, it is desirably a comparatively soft and conductive material such as gold, silver, copper, platinum and their alloys, from the viewpoint of damage prevention.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode structure of a welding machine, and more particularly to a welding process such as resistance spot welding or resistance brazing welding in which an electrode is brought into direct contact with an object to be welded. The electrode structure of the welding machine.

[0002]

2. Description of the Related Art Conventionally, an electrode used when welding an electrode by directly contacting the object to be welded, such as resistance spot welding, resistance brazing welding, etc., is not necessary for energization when the conductivity of the electrode is low. If the temperature rises excessively and the hardness or strength of the electrode is low, the electrode is deformed when the electrode is used, resulting in poor welding efficiency. Therefore, in order to compensate for these disadvantages, chromium copper, chromium-zirconium copper, alumina copper, or the like, which is mainly composed of copper, is generally used as an electrode material corresponding to an object to be welded.
The shape of the electrode made of such a material is shaped according to the shape of the workpiece.

A method of performing resistance spot welding and resistance brazing welding using these electrodes under predetermined conditions will be described. First, the case of resistance spot welding will be described. After inserting a workpiece to be divided into electrodes between electrodes mounted opposite to each other on a welding machine, determining the position while applying pressure, and supplying power to the electrodes. The welding is performed by welding by causing heat to be generated in the divided portion by the resistance of the workpiece to be divided. Also, in the case of resistance brazing, as in the case of resistance spot welding, a workpiece to be divided is inserted between electrodes mounted opposite to each other on the welding machine, and a gap between the workpieces is formed. After the brazing material is filled and arranged, the position is determined while applying pressure, and then power is supplied to the electrodes, and the resistance of the workpiece to be split causes the divided portions to generate heat and melt the brazing material. , To perform brazing.

The welding process such as resistance spot welding is frequently used in so-called machining and can-making, and is also required to produce minute and precise finishing precision for jewelry such as rings and broaches. It is also used for welding processing where is required. The electrodes used for processing jewelry such as rings and brooches are different in shape and size, but are not different in material and function from the electrodes used for the above-described machining and the like. .

[0005]

When welding jewelry such as rings and broaches by resistance spot welding or resistance brazing welding, if the number of contacts between the workpiece and the electrode is increased, the welding efficiency is improved. On the other hand, the current tends to concentrate on a very small part of the surface of the workpiece that contacts the electrode during welding. An oxide film on the surface of a metal such as an electrode or a ring is melted on the portion where the current is concentrated, that is, on the surface of the ring or the like, and a phenomenon occurs in which the fused material adheres. That is, if an attempt is made to pressurize and supply electricity to a metal having an uneven oxide film formed on the surface, the oxide film formed on the surface of the metal generally acts as a resistance during energization. Flows only through a portion having a low electric resistance, and the current is concentrated in this portion.

As a result, the temperature rises excessively in the portion where the current is concentrated, and in particular, in the case of jewelry such as rings and brooches based on relatively soft metals, a fusion material adheres to the surface of the jewelry. After welding, removal of the fused material is indispensable work, and metals used for jewelry such as rings and brooches are precious metals such as gold, platinum and silver. The operation of removing the adhered substance adhered to the surface has been a work requiring nerves. In addition, the contact surface of the electrode with the work to be welded may also depend on the frequent current flow.
The wear is remarkable, and in order to perform good welding, it is necessary to replace a relatively expensive electrode itself.

Therefore, the present invention has been made to eliminate such a drawback, and when performing a welding process by resistance spot welding or resistance brazing of jewelry such as a ring or a broach, the ring or the broach after the welding is performed. To provide an electrode structure for a welding machine that can minimize the adhesion of the fused material due to welding to the surface of the jewelry as well as prevent the consumption of the electrode itself. It is an issue.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a welding process such as resistance spot welding, resistance brazing welding, etc., in which an electrode is brought into direct contact with a workpiece to perform a welding process. In the electrode structure of the welding machine, the contact surface of the electrode with the workpiece is formed in accordance with the shape of the workpiece, and a contact member is disposed on the contact surface. Means.

[0009] Preferably, the contact member is formed by knitting a knitted cloth into a cloth shape using a conductive wire rod by engaging the contact member with the shape of the contact surface. The contact member is knitted in a cord shape using a wire having conductivity, and is engaged with the shape of the contact surface, and is formed on the contact surface of the electrode. The contact member is configured to directly wind a conductive wire on the contact surface of the electrode.

Further, the contact member is made of a conductive plate material, and the surface of the plate material on the contact side with the workpiece is
It is configured to be shaped into irregularities and fixed to the contact surface of the electrode.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electrode structure of a welding machine according to the present invention having such a configuration will be described with reference to the accompanying drawings.

FIG. 1 is an overall perspective view showing a resistance spot welding machine having an electrode structure according to the present invention. FIG. 2A is a side view of an electrode showing a first embodiment of the electrode structure. b)
FIG. 4 is a plan view of a contact member having an electrode structure, and FIG. 4C is a plan view of another contact member. FIG. 3 is an overall perspective view of an electrode showing a second embodiment of the electrode structure. FIG. 4 (a) is a perspective view showing a third embodiment, and FIG. It is a perspective view showing an embodiment.

The resistance spot welding machine WM1 having the electrode structure of the present invention shown in FIG. 1 has a contact surface 10a of the electrode 10 with the workpiece W as shown in FIG. The contact member 20 is formed on the contact surface 10a while being formed in accordance with the shape of the workpiece W.

As shown in FIG. 2B, the contact member 20 is made of a cloth 21 woven using a conductive wire.
The knitting is performed by engaging with the shape of the contact surface 10a, and mounting portions 22 are formed at both ends thereof, and mounting holes 23, 23 are formed in the mounting portions 22, 22. Then, it is screwed and fixed to the contact surface 10 a of the electrode 10 by the bolt 11. As another contact member 20, FIG.
As shown in (c), the wire is knitted into a cord 21b using a conductive wire, and like the contact member 20 having the cloth shape 21a, the shape of the contact surface 10a of the electrode 10 is reduced. Attach and form mounting portions 22 and 22 at both ends thereof, and drill mounting holes 23 and
1 is screwed and fixed to the contact surface 10a of the electrode 10. By screwing the contact member 20 having such a configuration to the electrode 10, the workpiece W is sandwiched without directly contacting the contact surfaces 10 a and 10 a of the electrodes 10 and 10.

Electrode 1 formed according to the shape of workpiece W
Even if it is 0, it may be point contact depending on the installation condition of the work W to be welded. However, it is possible to eliminate the above-mentioned problem caused by the point contact by using such an electrode structure. it can. That is, the contact between the workpiece W and the contact surface 10a of the electrode 10 is made by pressing the wire constituting the contact member 20 by sandwiching the electrodes 10 and 10, and the contact with the workpiece W is referred to as so-called surface contact. It will be. Therefore, the current supplied from the welding power source is not concentrated and supplied to one point of the workpiece W. Although the material of the wire is not particularly limited, when a jewelry such as a ring is used as the workpiece W, it is relatively soft from the viewpoint of preventing damage to the workpiece W by pressing the electrode 10. Good effects can be obtained if the material is conductive gold, silver, copper, platinum, an alloy of these materials, or a material obtained by plating these materials on a base metal.

FIG. 3 shows the electrode 10 shown in FIGS.
This shows an electrode 32 having a contact surface 32a having an outer shape different from that described above. A contact member 31 engaged with the shape of the contact surface 32a is fixed to the contact surface 32a. As in the case of the electrode 10 of FIG.
2 without being in direct contact with the contact surface 32a.
Therefore, the same effects as those of the electrode 10 shown in FIGS. 1 and 2 can be obtained.

Further, the electrode 36 shown in FIG.
The surface of the conductive plate member 36a on the contact side with the workpiece W is shaped into an uneven shape and fixed to the contact surface 10b of the electrode 36, so that the workpiece W contacts the electrodes 36, 36. Face 1
0b without direct contact. The electrode 37 shown in FIG. 4B has an irregular contact portion 20c directly formed on the contact surface 37a of the electrode 37. By forming the contact portion 20c, the electrode 37 is similar to the electrode 36 described above. The effect of can be expected. In addition, shaping the surface of the plate material 36a into an uneven shape,
Further, by using a relatively soft material and a conductive material, the contact with the workpiece W can be a surface contact or a large number of point contacts as in the case of the above-mentioned contact member 20. Diffusion of current concentration is achieved.

The electrodes 10, 32, 3 having such a configuration
6, 37, the resistance spot welder WM shown in FIG.
The procedure of welding the workpiece W by No. 1 will be described below.

First, the vertically opposed electrodes 10, 32, 3 are fixed to the fixed clamp portion 5A of the resistance spot welding machine WM1.
6, 37, lower electrode shaft portions 12, 33, 12b,
The shaft portions 12, 33, 12b, and 12c of the upper electrodes of the electrodes 10, 32, 36, and 37 vertically opposed to each other are fixed to the sliding clamp portion 5B. Then, the electrodes 10, 32 fixed to the fixed clamp portion 5A,
Electrodes 1 fixed to 36, 37 and sliding clamp portion 5B
After the workpieces W to be divided are placed in the gaps formed between the workpieces 0, 32, 36, and 37, the sliding clamp portion 5B is slid downward in the direction indicated by the arrow in FIG. The workpiece W is sandwiched between the upper and lower electrodes 10, 32, 36, and 37.

The workpiece W sandwiched between the upper and lower electrodes 10, 32, 36, and 37 is pressed together with the sliding of the sliding clamp portion 5B and pressurized before the power is supplied from a welding power source (not shown). Both contact surfaces 1 of both electrodes 10, 32, 36, 37
0a, 32a, 10b, and 37a.

The electrodes 10, 32, 36,
The electrodes 10, 32, and 3 of the workpiece W sandwiched by 37
Except for the electrode 37, the contact members 20, 31 and the plate member 36a are attached and fixed to the contact surfaces 10a, 32a, 10b, 37a with the contact members 6, 37, respectively. The outer portions of the contact members 20, 31 and the plate 36a made of a wire are
Due to the pressing of 32 and 36, the workpiece W is deformed in accordance with the outer shape. Therefore, the current supplied from the welding power source is
The power is not concentrated on one point of the workpiece W, and the adhesion of the fused material due to welding becomes very small.

Next, the electrode structure 1B of the present invention provided in the resistance brazing welder WM2 will be described with reference to FIGS.

The resistance brazing welder WM2 and its electrode 40 are as described above, and the electrode 40 described in the resistance spot welder WM1 is also used for this electrode 40.
Problems similar to 0, 32, 36, and 37 have occurred. The electrode structure 1B will be described by taking, as an example, a brazing process of a workpiece W such as a ring using a resistance brazing welder WM2 including the electrode 40 of the present invention.

As shown in FIGS. 6A and 6B, a contact member 40a is provided on the outer periphery of each pair of electrodes 40 in a round bar shape.
Is wound. The contact member 40a to be mounted is
Relatively soft and conductive wire material, gold, silver,
Copper, platinum and alloys of these materials are used.

When a workpiece W such as a ring is placed on the outer periphery of the electrode 40 on which the contact member 40a is wound, the vice portion 6 of the resistance brazing machine WM2 is directed downward in the direction indicated by the arrow in FIG. And the workpiece W is fixed. By this fixation, the contact area of the workpiece W to the contact member 40a is increased, and the current can be prevented from being concentrated at one point.
Since an excessive rise in temperature can be suppressed, the generation of deposits due to melting of the oxide film during power supply can be minimized.

[0025]

According to the electrode structure of the welding machine of the present invention described above, the following effects can be obtained.

When performing a welding process by resistance spot welding or resistance brazing welding of jewelry such as a ring or a broach, the adhesion of the fused material accompanying the welding to the welded surface of the jewelry such as a ring or a broach is minimized. It becomes possible to make it minute. Further, it is possible to prevent the electrode itself from being worn, and it is possible to eliminate the necessity of replacing the electrode itself by replacing the contact member.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a resistance spot welding machine having an electrode structure according to the present invention.

FIG. 2A is a side view of an electrode showing a first embodiment of an electrode structure, FIG. 2B is a plan view of a contact member of the electrode structure,
(C) is a plan view of another contact member.

FIG. 3 is an overall perspective view of an electrode showing a second embodiment of the electrode structure.

FIG. 4A is a perspective view showing a third embodiment, and FIG. 4B is a perspective view showing a fourth embodiment.

FIG. 5 is an overall perspective view showing a resistance brazing welder having the electrode structure of the present invention.

6A is an overall perspective view of an electrode structure of a resistance brazing welder, and FIG. 6B is a cross-sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode structure 1B Electrode structure 5A Fixed clamp part 5B Sliding clamp part 6 Vice part 10 Electrode 10a Contact surface 10b Contact surface 11 Bolt 12 Shaft part 12b Shaft part 12c Shaft part 20 Contact member 21a Cloth 21b Cord 22 Mounting Part 23 Mounting hole 31 Contact member 32 Electrode 32a Contact surface 33 Shaft part 36 Electrode 36a Plate 37 Electrode 37a Contact surface 40 Electrode 40a Contact member W Workpiece WM1 Resistance spot welder WM2 Resistance brazing welder

Claims (5)

[Claims] 1. An electrode structure of a welding machine used for welding processing such as resistance spot welding and resistance brazing welding in which an electrode is brought into direct contact with an object to be welded, wherein the object to be welded of the electrode is provided. And a contact surface is formed in accordance with the shape of the workpiece, and a contact member is disposed on the contact surface. 2. The method according to claim 1, wherein the contact member is formed by knitting a cloth using a conductive wire.
The electrode structure of a welding machine according to claim 1, wherein the knitting is performed by engaging with the shape of the contact surface, and is knitted and fixed to the contact surface of the electrode. 3. The contact member is knitted in a cord shape using a conductive wire, is engaged with the shape of the contact surface, and is fixedly attached to the contact surface of the electrode. The electrode structure of a welding machine according to claim 1, wherein 4. The electrode structure for a welding machine according to claim 1, wherein the contact member is configured to wind a conductive wire directly on a contact surface of the electrode. 5. The contact member is made of a conductive plate material, and the surface of the plate material on the contact side with the work to be welded is shaped into an uneven shape and is fixed to the contact surface of the electrode. The electrode structure of a welding machine according to claim 1, wherein: