JPS5844937Y2 - Spot welding electrode equipped with welded parts suction device - Google Patents

Description

[Detailed description of the invention] This invention uses a welded parts suction device that suctions small parts to prevent them from being misaligned when spot welding small parts to a relatively large member. The present invention relates to a spot welding electrode equipped with a spot welding electrode.

A spot welding machine having a structure as shown in FIG. 1 is commonly used.

That is, two arms 2 and 3 are vertically opposed to each other and protrude forward from the main body 1, and the upper electrode holder 4 is opposed to the arm 2, and the lower electrode holder 5 is opposed to the arm 3. installed.

An upper electrode 6 is attached to the lower end of the upper electrode holder 4, and a lower electrode 7 is attached to the upper end of the lower electrode holder 5.

In order to perform welding with a spot welding machine having such a structure, two objects to be welded are sandwiched between the upper electrode 6 and the lower electrode 7, and electricity is applied for a predetermined period of time. If one of the parts is small, it will be difficult to position it.

FIG. 2 shows such a case, where 8 is a pressed product obtained by pressing a thin metal plate, and 9 is a clamp for wiring.

In order to spot weld the relatively large pressed product 8 and the small beam lamp 9 in this way, hold the clamp 9 by hand and place it in a predetermined position as shown in the figure.
The pressed product 8 and the clamp 9 are sandwiched between the lower electrode 7 and energized.

This is because the structure of the spot welding machine does not allow for the provision of a regulating device for positioning.

However, positioning one side of the workpiece by hand in this manner is dangerous and should be avoided as much as possible.

Therefore, after adhering an adhesive material such as a spot sealer to the lower surface of the clamp 9, spot welding may be performed with the clamp 9 adhered to the press product 8.

However, when using an adhesive material, there is a problem in that the work of applying the adhesive material and the adhesive material itself are wasted.

This invention provides a spot welding electrode that solves these problems.

Next, an embodiment of this invention will be described with reference to FIGS. 3 and 4. Reference numeral 10 denotes an adsorption device, and this adsorption device 10 has a semi-cylindrical magnetic material 11, 12 placed at a slight distance from an upper electrode 6.
The magnetic material 1L
The inner and outer peripheries of 12 are covered with a resin material 13 and molded (see Fig. 4).

The upper end portion of the magnetic material 1L12 is drawn out to the outside from the resin material 13, and the drawn-out portions 11a and 12a are connected in a loop shape, and the coil 14 is wound around the drawn portions 11a and 12a.

An AC power source 15 is connected to the coil 14 .

There is a slight gap between the inner wall of the resin material 13 covering the inside of the magnetic material 11, 12 and the upper electrode 6, so that the suction tool 10 does not displace in the axial direction of the upper electrode 6. It's Nishide.

A holder 16 is fixed to the upper electrode 6 by a set screw 17, and is adapted to guide the upper electrode 6 when it moves up and down.

In this suction device 10 configured in this way, the coil 1
When an alternating current voltage is applied to 4, the magnetic materials 11 and 12 become electromagnets, and lines of magnetic force as shown by broken lines in the figure are generated all around the tip of the adsorbent 10, which generates an attractive force toward other magnetic materials. do.

Therefore, the clamp 9 can be stably attracted here.

The working procedure is to attach the clamp 9 whose position and orientation are determined to the tip of the suction tool 10 with the upper electrode 6 in the raised state as shown in FIG. When the suction tool 10 comes into contact with the upper surface of the pressed product 8,
is raised relative to the upper electrode 6, and the clamp 9 and the pressed product 8 are held between the upper electrode 6 and the lower electrode 7, and at this time, electricity is applied to perform welding.

Note that the alternating current voltage is applied to the coil 14 from the time when the clamp 9 starts attracting the clamp 9 to just before the start of welding.

Figures 5 and 6 show other embodiments of this invention.
A cylindrical body 18 made of heat-resistant soft rubber is provided on the outer periphery near the tip of the upper electrode 6 with a slight gap to form a suction tool 19.

The cylindrical body 18 has a constricted portion 18a near the upper end,
It is fixed to the upper electrode 6 by a set screw 20 at its upper part.

As a result, when the upper electrode 6 finishes descending, the constricted portion 18a is compressed.

A plurality of holes 21 are vertically bored in the lower part of the constricted portion 18a of the cylindrical body 18 (see FIG. 6).

This hole 21 opens at the tip of the cylindrical body 18, and the upper end is commonly connected to form a hose connection port 22, to which a hose 23 is connected.

The other end of the hose 23 is connected to a vacuum pump (not shown).

As a result, a suction force is generated over the entire circumference of the tip of the suction tool 19, and the suction tool 19 functions as a vacuum suction device.

In this suction tool 19 configured in this manner, suction force is applied to the hole 21 by operating the vacuum pump, so that the clamp 9 can be stably suctioned to the tip of the cylindrical body 18.

The upper electrode 6 may be lowered in this state.

The upper electrode 6 and the suction tool 19 can be easily separated from the clamp 9 by operating the vacuum pump only during the attachment work of the clamp 9 and stopping the operation when welding is completed.

Note that this invention can also be implemented for the upper electrode.

Since this invention is constructed as described above, it has the following effects.

(1) Particularly when spot welding small parts, it is possible to hold the parts in place by simply suctioning the parts to the tip of the suction tool. Since the parts are held by suction, there is no danger of holding them by hand, which was conventionally done.

(2) Extra work such as adhesion of adhesive is no longer necessary, so the work is greatly streamlined.

(3) It has a simple structure and excellent durability.

(4) Applicable not only to stationary welding machines but also to portable welding machines (spot guns).

[Brief explanation of drawings]

Fig. 1 is a side view of the spot welding machine, Fig. 2 is a perspective view showing the state of welding work, Fig. 3 is a longitudinal cross-sectional view of an embodiment of this invention, and Fig. 4 is taken along the line IV-IV in Fig. 3. FIG. 5 is a longitudinal sectional view of another embodiment of the invention, and FIG. 6 is an enlarged sectional view taken along line VI--VI in FIG. 6... Upper electrode, 7... Lower electrode, 8
...Pressed product, 9...Clamp, 10
, 19... Adsorption tool, 1L12... Magnetic material, 14... Coil, 15... AC power supply, 18... Cylindrical body.

Claims (1)

[Scope of utility model registration request] A spot welder is provided with a cylindrical suction tool that surrounds the outer periphery near the tip of the electrode, is displaceable with respect to the electrode in the axial direction of the electrode, and has a suction force over the entire circumference of the tip. Spot welding electrode equipped with welding parts suction device.