JPS5823496Y2 - welding electrode - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electrode for butt resistance welding, and is particularly suitable for butt resistance welding when bending sheet metal to produce an annular body. The present invention proposes an electrode that is characterized by reducing the number of steps and preventing the occurrence of a step at the butt weld.

Conventionally, when manufacturing an annular body using sheet metal, for example, the sheet metal is bent with a predetermined radius of curvature, and the opposing end faces are welded by butt resistance welding. Figure 4 shows the butt resistance welding process. The annular body is shown as viewed from the front.

In FIG. 4, numeral 1 is an annular body formed by bending a steel plate with a predetermined radius of curvature into a cylindrical shape, and numerals 2 and 2 are a pair of welding electrodes.

Each welding electrode 2, 2 has a curved surface 2a on the opposing surface side that can be brought into alignment contact with a portion of the outer peripheral surface of the annular body 1 close to the abutting portion A;
2a, and the curved surfaces 2a, 2a are brought into contact with the outer circumferential surface of the unwelded annular body 1 on both sides of the abutment part A,
With the abutting end faces brought into close contact with each other under pressure by themselves or other suitable pressurizing means, electricity is applied to the electrodes 2, 2, thereby causing heat generation in the abutting portion A due to resistance loss and welding. , the annular body is completed by this welding.

However, the electrodes 2, 2 are formed with a thin wall thickness at their opposing tips so as to come into consistent contact with the outer circumferential surface of the annular body 1, which is the object to be welded, and prevent the occurrence of diverging, and are generally made of copper. However, the rigidity is lower than that of steel, etc., which is the material of the annular body, and the tip of the electrode is deformed when the annular body 1 is welded due to the influence of heat generated by resistance loss.

For this reason, as shown in FIG. 5, a step B may occur after the abutting portion A is welded.

Furthermore, when the electrodes 2 and 2 are worn out due to repeated use, the rigidity decreases by 7.
There is a risk that the layer will drop and a significant level difference will occur, so in order to prevent this from happening, it is necessary to frequently perform maintenance and inspection of the electrode, and the electrode has the disadvantage that it has a relatively short lifespan.

In view of the above-mentioned problems, the present invention consists of an electrode body made of copper-based metal with low rigidity and a pressing jig made of high rigidity steel etc. that presses and grips the annular object to be welded. hand,
The electrode body is provided with a welding electrode that does not apply a strong pressing force to the abutting portion A of the annular body to reduce deformation and wear of the curved surface of the electrode body that comes into contact with the annular body. The present invention will be explained below based on the drawings showing the embodiments thereof.

1 to 3 are an exploded perspective view, an assembled perspective view, and a state diagram during welding of a welding electrode in butt resistance welding according to the present invention, respectively.

In Fig. 3, 10°10 is a pair of welding electrodes,
Each welding electrode 10 is made of a copper-based conductive material with low rigidity.

It is composed of an electrode body 11 and a pressing jig 12 made of a highly rigid steel material or the like.

The upper end surface of the electrode body 11 and the lower end surface of the pressing jig 12 both have the same width dimension C1 and length dimension. It is significantly smaller than the dimension F.

A curved surface 11a is formed on the front surface of the electrode body 11 so as to be in alignment contact with the outer peripheral surface of the annular body to be welded. A notch 11b of an appropriate length is formed at a right angle.

The lower front side of the twisted electrode main body 11 extends downward by an appropriate length to form a locking portion 11c.

First, the pressure jig 12 has the same radius of curvature as the curved surface 11a formed on the electrode body 11, and the annular body 1 of the workpiece
A curved surface 12a that can be brought into alignment contact with the outer circumferential surface of is formed.

In addition, the width and length of the upper end portion of the notch 11b formed in the electrode body 11 are arranged at the center portion of the upper curved surface side of the pressurizing jig 12 in the front width direction of the pressurizing jig 12. An engaging protrusion 12b is formed which has a slightly shorter width and length and is fitted into the notch 11b.

Both sides of the upper end of the curved surface 12a of the pressing jig 12 are cut off vertically, and the locking surface 1 is joined to the locking portion of the electrode body 11.
2e and 12e are formed.

The height dimension of this engaging protrusion 12b is determined by the pressure jig 12.
When the electrode main body 11 is disposed on the upper part of the engaging protrusion 12
It is selected to be shorter than E so that the upper end of b is located slightly below the upper end surface of the electrode main body 11.

The notch 11b of the electrode body 11 and the engagement protrusion 12b of the pressing jig 12 are engaged, and the locking portion 11C is connected to the locking surface 1.
2c, the pressurizing jig 1 is assembled as shown in FIG.
The welding electrode 10 can be assembled by disposing the electrode body 11 on the upper part of the welding electrode 2, and the movement of the electrode body 11 with respect to the pressing jig 12 is prevented.

It is preferable that the electrode body 11 and the pressing jig 12 be electrically insulated. A heat-resistant insulating member (not shown) is interposed between the portions 12 that are in contact with each other, or an insulating coating is applied thereto.

Furthermore, if necessary, a pressurizing jig 12 is inserted through the electrode body 11.
The two may be integrated by a bolt (not shown) that is screwed into the two.

A water passage for that part may be provided in the electrode main body 11 where the residue is left.

When the welding electrode 10 is assembled, the curved surfaces 11a and 12a of the electrode body 11 and the pressure jig 12, which are concentric and formed with the same radius of curvature, are connected to each other on the same surface. ing.

The butt resistance welding using the welding electrode constructed as described above is performed as shown in FIG.

The two welding electrodes 10 having the same size and shape as described above are arranged to face each other with the curved surfaces 12a of the husband and husband separated by an appropriate length, and the curved surfaces 12a are opposed to each other.

An annular body 1, which is an object to be welded and is curved into a cylindrical shape and has end faces facing each other, is placed between the annular bodies 12a.

Subsequently, the pressing jigs 12, 12 of both welding electrodes 10.10 are pressed in a direction to bring them closer together and this state is maintained.

This pressing force can be applied to the outer peripheral surface of the annular body 1 by the curved surface 12a of the highly rigid pressing jig 12, and the opposing abutting end surfaces of the annular body can be tightly joined.

Subsequently, an upper electrode 13.13 is placed on the upper end surface of each electrode body 11.11, either integrally or separately from the upper electrode 13.13.
, 13 to apply appropriate downward pressure to the electrode body i1.
ii and the annular body 1, and applying a welding current to the abutting portion A of the annular body 1 through the lead wire 3, the upper electrode 13, and the electrode body 11 from the welding power source (not shown), The abutting portion A of the annular body 1 is welded.

The annular body 1, which has been welded, has both welding electrodes i facing each other.
By separating o and io from each other, the pressing force is released and removed.

Subsequently, the annular body 1 to be welded is placed at that position, and butt resistance welding is performed in the same order as described above.

In the case of this product as described above, since no pressure is applied to the abutting portion A by the electrode body 11 itself, there is little wear, and even if some wear occurs, this electrode The end surfaces to be brought into contact are positioned and pressed by the pressing jigs 12, 12, which have higher rigidity than the main body 11 and therefore have less wear and deformation, and the step B as described above is formed. There is no fear that the electrode body 11, it may be stiff, and it can withstand use for a longer period of time than in the past.

If the electrode body 11 and the pressing jig 12 are electrically insulated, even if the curved surface 12a is designed to be long enough, only a small amount of current will flow without passing through the abutment part A, which will cause problems in welding. Of course, the positioning of the end faces to be brought into contact with each other can be performed with high precision.

Note that when the electrode body 11 and the pressing jig 12 are combined, the engagement protrusion 12b is retracted downward from the upper end surface of the electrode body 11, so the upper electrode 13 is moved from the upper end surface of the electrode body 11. Even when the engagement protrusion 12b is in contact with the upper surface of the engagement protrusion 12b, it does not come into contact with the upper surface of the engagement protrusion 12b, which is convenient.

Note that the electrode main body 11 is divided into two parts when looking at the part that contacts the vicinity of the abutment part A, but because of this, the resistance loss in the central part of the abutment part A, that is, the part close to the engagement protrusion 12b. This did not result in a reduction in the heat generated by the welding process, and uniform welding could be performed over the entire length of the abutment part A.

When manufacturing an annular retainer for a cylindrical roller bearing using the proposed product, one of the windows for housing the cylindrical rollers is formed across both sides of the abutment part, so the length of this window is in the axial direction of the cylindrical rollers. If the width dimension of the notch portion 11a is made to match the width dimension of the cutout portion 11a, there is also the advantage that current can be efficiently applied to the required welded portions, that is, the edges of the cage located on both sides of the window.

In the above-described embodiment, one cutout and one engagement protrusion are provided, but it goes without saying that two or more of each may be provided.

As described in detail above, the present invention has the advantage of being able to suppress the occurrence of a step in the butt weld and providing a high-quality annular body.

[Brief explanation of the drawing]

1, 2, and 3 are exploded perspective views, assembled perspective views, and welding state diagrams of welding electrodes showing embodiments of the present invention, respectively; FIG. 4 is welding state diagrams using conventional welding electrodes; The figure is a perspective view of a butt-welded annular body. 1... Annular body, 10... Welding electrode, 11
... Electrode body, 11b ... Notch, 1
1c... Sun stop part, 12... Pressure jig, 1
2b...Engaging protrusion, 12c...Sun stop surface.

Claims (1)

[Scope of utility model registration request] 1. A welding electrode used for welding an annular body to be formed by abutting resistance welding of end faces, the annular body has a curved surface that aligns and contacts a portion near the abutting end face on the outer peripheral surface of the annular body, and a curved surface on the side of the curved face. an electrode body formed with a notch; an engaging protrusion that is made of a material more rigid than the electrode body and that fits into the notch; and a curved surface that aligns and contacts the outer peripheral surface portion of the annular body that does not contact the curved surface. A welding electrode comprising: a pressure jig having a pressure jig; 2. The welding electrode according to claim 1, wherein the electrode body and the pressing jig are electrically insulated.