JPS6034464Y2 - Conduction electrode for indirect capacitance - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a conductive electrode for indirect welding.

Figure 1 shows an indirect welding device.

In this device, a welding gun 3 having a welding tip 2 at the lower end that is biased downward by a built-in spring (not shown) is attached to an upper fixed plate 1 via a bracket 4. An electrode portion 6 having an indirect conduction electrode 5 at its lower end that is biased downward by a spring is attached via a bracket 7.

Further, a welding transformer 8 is attached to the upper fixed plate 1 via a bracket 9, and the welding transformer 8, the welding tip 2, and the conductive electrode 5 are connected via a cable 10.11 so that power can be supplied.

On the other hand, on the lower movable plate 12, a pedestal 13 made of an insulating material is mounted on the bracket 1 so as to face the welding tip 2.
It is attached via 4.

When this device is used to weld the seam fold 16 of a part to be welded, for example, an outer panel part 15 such as an automobile hood, trunk lid, or door, which has been temporarily fixed in advance, the outer panel part 15 is placed on the pedestal 13. After placing the lower movable plate 12 on top, the welding tip 2 and the pedestal 13 form a folded part 16.
The cable 10.1 is compressed and the conductive electrode 5 is crimped onto the inner panel 15a constituting the outer panel part 15.
This is done by energizing 1.

The conventional conducting electrode 5 for indirect welding used in the above-mentioned indirect welding device is shown in FIG. 2A, for example.
As shown in FIGS. 1 and 2B, they are made of copper blocks or thick copper plates and are attached to the electrode holding plate 17 by ports 22 via insulators 18, 19, 20, and 21 made of Bakelite, for example.

Therefore, the conductive electrode 5 and the electrode holding plate 17 are insulated.

Further, the electrode holding plate 17 is attached to the pressure pad 23.
It was concluded by Porto 24.

Further, the terminal of the cable 11 is connected to the conductive electrode 5 through the port 2.
2, it is tightly fastened.

However, according to the conventional conductive electrode 5, for example, 1. When making contact with the bent part of the inner panel 15a as shown in FIGS. 2A and 2B, the shape can be made by model matching, panel matching, or NC processing, etc. to make contact with the bent part of the inner panel 15a of the outer panel part. Because it is processed into a shape,
If the shape or position of the inner panel 15a and the conductive electrode 5 do not completely match, there is a problem that they will hit unevenly, and a large current will flow to the unevenly touched part, causing the squirrel grasshoppers that caused galvanic corrosion to fly off.

This invention was made in view of these conventional problems, and aims to solve the above problems by providing a conductive electrode for indirect welding that can prevent uneven contact.

This invention will be explained below based on the drawings.

FIGS. 3A and 3B are diagrams showing an embodiment of this invention.

First, to explain the structure, the conductive electrode 25 is a bundle of a large number of visible electrode elements 25a made of a conductive material, for example, a number of copper wires, chrome copper wires, or other wires with a wire diameter of 0.2φ to 0.3φ. A bundle of 100 cables, or a bundle of dozens of jumper cables with copper wires meshed into a net with an extremely fine zigzag edge at the bottom end, or a bundle of thin copper plates. It is made of so-called ounce copper plates with one-dimensional directionality bound together with wire rods 25b, and may be roughly formed to match the inner panel 15a, if necessary.

This upper end is housed in a cylindrical fixed plate 25C, and the plate 25c is caulked to reduce its diameter to form a brush shape and is attached to the electrode holding plate 17 with bolts 22.

The structure for attaching the conductive electrode 25 to the pressure butt of the indirect welding device is configured exactly the same as the conventional case shown in FIGS. 2A and B, so the same reference numerals are used in the figures. , the explanation thereof will be omitted.

Next, the action will be explained.

Since the conductive electrode 25 has a brush-like tip, when it comes into contact with the inner panel 15a, it bends along the curved shape of the inner panel 15a so that the tip maintains contact with the inner panel 15a and does not hit unevenly.

Therefore, since a large contact area can be secured, welding transformer 8
The current flows from the welding tip 2 of the welding gun 3 through the inner panel 15a and from the conductive electrode 25 to the cable 11, and since the contact area between the inner plate 15a and the conductive electrode 25 is large, localized large currents are prevented. There will be no flow, and as a result, electrolytic corrosion will not occur.

Furthermore, it is no longer necessary to model, shape, and align the conductive electrode 25 with respect to the inner panel 15a.

As explained above, according to this invention, the conductive electrode for indirect welding is made into a brush-shaped conductive electrode made by bundling a large number of copper wires or jumper cables, etc., instead of a copper block or thick copper plate. Even if the bent part of the workpiece is not accurately aligned with the conductive electrode, the brush-like conductive electrode will not come into contact with the bent part of the workpiece over a large area, resulting in uneven contact. During direct welding, a localized large current will not flow through the contact area between the workpiece and the conductive electrode, so that the inner panel will not undergo electrolytic corrosion and spatter will not occur.

In addition to the above effects, there are also the following effects.

This conductive electrode significantly reduces the number of manufacturing and maintenance steps, allows the use of waste cable materials, and can be reused by cutting off the tip when worn out.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional indirect welding device, Figure 2
Figures A and B are a front view and a side view of the same conductive electrode for indirect welding as described above, and Figures 3A and B are a front view and a side view of the conductive electrode for indirect welding of this invention. 25...Conducting electrode.

Claims (1)

[Scope of utility model registration request] A conductive electrode for indirect welding characterized by being constructed by bundling a large number of flexible electrode elements made of conductive material.