JPS5844931Y2 - Resistance spot welding equipment for aluminum wire mesh production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resistance spot welding device for manufacturing aluminum wire mesh.

Traditionally, wire mesh for shelves for kitchen utensils, fan covers, kerosene stove enclosures, etc. is made by spot welding iron wire.

Chrome plating was applied to this wire mesh, but this type of wire mesh corroded after about two years, causing not only poor appearance and damage, but also pollution problems associated with the treatment of chrome plating drainage during construction. It had a difficult Z problem such as occurrence.

Therefore, in order to eliminate the above-mentioned drawbacks, without using iron wire,
The use of aluminum wire has been considered as an alternative, and various efforts have been made to develop it. The intended purpose could not be achieved due to problems or other reasons.

In other words, a typical resistance spot welding electrode has a flat tip, but if the tip is flat, even if the welding conditions are varied, a good spot will be produced on relatively soft materials such as aluminum wire without creating any impressions. It was impossible to carry out welding.

However, as a result of various studies, the present inventor has devised a structure of a welding electrode for spot welding aluminum wire, and by setting the welding conditions appropriately, it is possible to spot weld aluminum wire well without indentation. Moreover, we have discovered that it is possible to make an aluminum wire mesh with excellent strength.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a resistance spot welding device for producing aluminum wire mesh by spot welding aluminum wires, which is simple and reliable in operation.

In this invention, at the tip of the aluminum wire welding electrode,
By providing a groove with a circular arc cross section corresponding to the wire diameter of the aluminum wire to be welded to be spot welded, and fitting the aluminum wire into this groove during spot welding, there is no problem in suppressing deformation to the external shape of the aluminum wire. , which is characterized by being able to perform good spot welding under appropriate welding conditions.

The aluminum wire used in this case has a certain degree of strength,
20-4 such as Al-Mg alloys 5052 and 5056.
The strength is preferably in the 0% range.

Further, it is desirable that the depth of the groove is 1050 times the diameter of the wire to be welded.

Hereinafter, some preferred embodiments of the resistance spot welding apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 shows a side view of an aluminum wire spot welding electrode 1 according to the present invention, and this electrode has a groove 2 at its tip having an arcuate cross-sectional shape that matches the outer shape of the aluminum wire to be welded.

During welding, the grooves 2 of the respective electrodes 1 are placed oppositely from above and below, and the grooves 2 are arranged at an angle to each other.
The wires to be welded are fitted into the wires, and the wires to be welded are pressed into contact with each other at an angle, and spot welding is performed under predetermined voltage and current conditions.

In this way, it was confirmed that the aluminum wires spot welded perpendicularly to each other, as shown in Figure 2, produced a welded part with good strength without causing any suppressive deformation in the outer shape of the welded part. has been done.

As mentioned above, the depth of the groove 2 is preferably selected to be approximately 10 to 50 times greater than the diameter of the aluminum wire to be welded.

By sequentially performing spot welding at predetermined positions on the aluminum wire as described above, an aluminum wire mesh having a predetermined structure can be obtained.

FIG. 3 shows a pair of welding electrodes 3, 4 according to the present invention, which allows a plurality of spot welds (three in the illustrated one) to be obtained in one welding operation.

That is, in one electrode 3, a plurality (three in the drawing) of grooves 5 having an arcuate cross-sectional shape that matches the outer shape of the line to be welded are formed in parallel at predetermined intervals, and the line to be welded is fitted into each groove 5. It is now possible to do so.

An electrode 4 opposite to the electrode 3 is formed with a groove 6 which is perpendicular to the groove 5 of the electrode 3 and has a circular arc cross section that also matches the outer diameter of the wire to be welded.

These grooves 5 and 6 have a depth of 10 to 50% of the diameter of the wire to be welded, as described above.

During welding, the aluminum wires to be welded are fitted into the grooves 5 of the electrode 3, and the aluminum wires to be welded are welded to the groove 6 of the electrode 4 so as to be perpendicular to the one aluminum wire to be spot welded to the three aluminum wires. spot welding is performed under predetermined voltage and current conditions.

As a result, as shown in FIG. 4, three orthogonal aluminum wires are spot-welded to one aluminum wire.

The angle between the aluminum wires welded together is not limited to a right angle, but can be selected to be any angle.

According to the present invention, as a modification of the electrode shown in FIG. 3, one electrode, for example, the electrode 4', is curved in a convex shape along the groove 6' as shown in FIG. This figure shows a method in which a plurality of aluminum wires are welded one after another by rolling them as if spot welding is performed from one side to the other.

With the electrode shown in Figure 3, if the flatness or depth of the electrode groove is uneven, or if the diameter of the aluminum wire to be welded is uneven, uniform welding will not be performed at each welding part. Although this may be a problem, the electrode shown in FIG. 5 allows uniform pressure welding to be achieved at each welding part.

According to the present invention, it is not only possible to spot weld multiple aluminum wires to one aluminum wire in one welding operation, but also to spot weld multiple aluminum wires to multiple aluminum wires at the same time. Welding is possible.

The following is an example of a performance test of a welded part obtained by spot welding aluminum wire for aluminum wire gauging according to the present invention.

In these tests, the wire diameters were 2.4mm and 3mm, respectively.
21ran Affi-Mg alloy 5o52 and 50
56 wires were used, and the two aluminum wires to be welded were placed perpendicular to each other and spot welded. Tests and shear tests as shown in FIG. 7 were conducted.

In this case, the diameter of the aluminum wire to be tested is 2.4 mm, and the welding conditions are as follows: Charging voltage: Forging, energizing pressure sample 1: 120V 0.651u 4V sample: 2 120V O, 6 mm: 5 shock sample: 3 12
Welding was carried out by selecting 0 V O, 6 Koku and 6 V.

Table 1 shows the results of peeling and shear tests for the welds welded under these conditions.

Table 1 Spot welding strength test Peeling load (Kg) Shearing load (K7) Sample 1 18.7 24°2 sample 2 1
7,1 23.3 sample 3 14.5
19.5 The structure of the sample welded part was found to be good both macroscopically and microscopically as determined by cross-sectional microscopic observation.

It was confirmed that the welds made with the electrodes shown in FIGS. 3 and 5 also had good structure and strength similar to the above test results.

As described above, according to the present invention, sufficient welding strength can be obtained and a spot welding apparatus suitable for manufacturing aluminum wire mesh is provided.

According to the present invention, the material of the aluminum wire is not necessarily limited to the above two types, and various aluminum alloys can be used.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of an electrode having a groove with a circular arc cross section at its tip according to the present invention. FIG. 2 is a side view of aluminum wires that are orthogonally spot welded according to the present invention. FIG. 3 is a plan view of another embodiment of the electrode according to the present invention. FIG. 4 is a plan view showing aluminum wires welded together made by the electrode of FIG. 3; FIG. 5 is a side view showing a modified form of the electrode shown in FIG. 3. FIG. 6 is a perspective view showing the procedure for a peel test. FIG. 7 is a plan view showing the procedure for a shear test. 1.3,4,4'... Electrode, 2,5,6...
・・・Groove with circular arc cross section

Claims (3)

[Scope of utility model registration request] (1) A resistance spot welding device for producing aluminum wire mesh, characterized in that it has an electrode having a groove at its tip with a circular arc cross-sectional shape that matches the outer shape of the wire to be welded. (2) Practical use characterized by having an electrode provided with a plurality of the grooves, and an electrode provided with a groove having an arcuate cross-sectional shape that matches the outer shape of at least one wire to be welded that acts as a tumor. A welding device according to claim 1 of patent registration. (3) A request for registration of a utility model characterized in that the electrode provided with a groove having an arcuate cross-sectional shape that matches the outer shape of the at least one wire to be welded has a shape that is convexly curved along the groove. The welding device according to item 2 of the scope. (Claim 1.2) The depth of the groove is 10-50 times the diameter of the wire to be welded.
Or the welding device described in item 3.