JPH0246982A - Electrode for spot welding - Google Patents

Abstract

PURPOSE:To prevent falling of a projection nut, etc., and to allow sure welding by constituting the electrode in such a manner that attraction magnetic force is applied to a guide pin and this attraction magnetic force is degaussed as desired. CONSTITUTION:A magnet 7 is detached from a flange 6 to prevent the generation of the attraction magnetic force in the guide pin 5 at the time of fitting, for example, the projection nut 11 formed with a projecting port for welding to the guide pin 5. The nut 11 is then supplied and the guide pin 5 is extremely smoothly fitted relatively into a screw hole. The attraction magnetic force is generated over the entire part of the guide pin 5 and the inside surface of the screw hole of the nut 11 is attracted to the guide pin 5 when the magnet 7 comes into tight contact with a flange 6 after the nut 11 is correctly supplied. The easy falling of the nut 11, etc., from the electrode is, therefore, obviated. The adaptation to an automated line is thus extremely adequate.

Description

DETAILED DESCRIPTION OF THE INVENTION (4) Field of Industrial Application This issue IJ1 is related to 111 in spot welding. (b) Conventional technology used in fields where objects are moved freely while being held in place.As a conventional example, a projection nut or the like is placed on an electrode and moved to a target location.

Place the electrode in a vertical position. It is known that the projection nut #P is fitted into the electrode guide bin, and the electrode itself is moved vertically or horizontally. In the conventional case, the projection nut, etc. is only placed on the electrode in a state where the kite bin penetrates, so there is no chance of some kind of shooting or nearby parts coming into contact with each other. Nuts, etc. often fall down, making normal welding impossible. However, there is a problem that it cannot be used in automated lines.

2) Means to resolve the problem sound W4 and its effects Main part 151
was provided to solve the above-mentioned problem, and it imparts an attractive magnetic force to the kite bin.

The feature is that this attractive magnetic force is arbitrarily demagnetized, and when a nut, etc. is placed by arbitrary demagnetization, the rod does not apply the attractive magnetic force to achieve smooth placement, and the electrode is placed on the target. When moving toward a location, nuts and the like are held in place by magnetic attraction.

(E) Embodiment The present IJI will be explained in detail using the embodiment shown in the drawings.@First, the first factor will be explained. Hole 4
is opened, an iron guide bottle 5 is slidably fitted into the guide hole 4, and a guide bottle 507 flange 6 is fitted into the accommodation hole 3.Means for applying full attractive magnetic force to the guide bottle 5. A water-filled magnet 7 is adopted as a magnet, and when the magnet 7 is closely connected to the 7 Kunji 6, 1! In order to demagnetize the attracting magnetic force up to the tip of the guide bin 5, the magnet 7 is pulled out from the 7 flange 6. In other words, an air cylinder is attached to the main 4F+2. 8
The piston rod 9 is fixed to the guide pin 5, and the coil spring 10 is arranged in the housing hole 6 to apply a force t in the protruding direction to the guide pin 5. Alternatively, compressed air pressure may be applied to the flange 6.

Note that the air hose of the air cylinder 8 is not shown in the figure. The component in this embodiment is a projection nut 11 as shown in FIG. 4, and a projection 12 for welding is formed on the projection nut 11. There is. Nut 11 guide bin 5
When fitting the FC magnet 7t-
7 Separated from the flange 6 to prevent the generation of attractive magnetic force on the guide pin 5. By doing this, when the nut 11 is supplied and the guide pin 5 is relatively inserted into the screw hole, The state shown in Fig. 4 will smoothly occur. After the nut is supplied correctly as shown in Fig. 4, the magnetic 45
As shown in Figure 1, an attractive magnetic force is generated between the stone that is in close contact with the 7 Kunji 6 and the entire guide bottle 5, and the nut 11
The inner surface of the screw hole is attracted to the guide bin 5. Fig. 2 shows an electromagnetic type, in which the excitation coil 13 is arranged continuously in the accommodation hole 3, and the iron core 14 moves inside the excitation coil 15. It has 7 langes 6 KWiN passing through it, and is connected to the piston rod 9-11. The operation in this case is also the same as in the previous book. In addition, by stopping the Jg2 air cylinder 8t and making the iron core 14 and the guide bin 5 into one piece, and cutting off the excitation current, the attraction magnetic force of the guide bin 5 can be completely demagnetized as desired.

In the example shown in Fig. 3, the guide bin 5 is made of a non-magnetic material such as stainless steel and has a hollow shape, and a permanent magnet 15t is placed inside the guide bin 5.
By inserting the magnet 15 into the piston rod 9 and joining (for example, gluing) the magnet 15 to the piston rod 9, the a-stone 15t is moved back and demagnetized.

As explained above, 1#&, 5j! A companion device applied to the actual robot device is shown in FIG. A small arm 20 is connected to the
&c electrode 1 or installation @ guide bin 5Vc nut 1
1t-The supply rod 21 has been extended for fitting, and the nut 11 is about to be placed on the electrode 1 side! 1
or illustrated. Steel 1 to be welded by nut 11! The item n is fixed by some kind of clamp mounting (not shown), and a fixed electrode 24 is placed behind the pilot hole 23 at a voltage of V!
are in contact with each other. Next, another steel plate component 25 is installed vertically in a V-shape as shown in the figure.0 It is placed on the nut 11 or the electrode 1, and the nut is attracted and held by the magnetic force of the guide bin 5. When the universal joint mechanism 17*19rC driving force is applied, the electrode 1 is moved to the same @O position as the pilot hole 26 of the steel plate part 22,
Then, the nut 11 is pressed against the steel plate part 22V and electricity is applied to complete the electric resistance welding.

In the same manner, nut contact is made to other steel plate parts 25. Note that the installation procedure for a nut queeg device, such as the supply rod 21 in FIG. 5, is as follows.

Nuts may be performed while the electrode 1 is stopped at the V (initial original position) as shown in FIG.

It is also possible to supply nuts after the electrode 1 is moved and stopped near the steel plate part, and there is also a method in which a flexible nut supply hose is fixed to the small arm 20. f) Effects According to the present invention, an attractive magnetic force is applied to the guide bin, and this attractive magnetic force can be arbitrarily demagnetized. By demagnetizing the magnetic force, it is possible to make the nut fit smoothly, and on the other hand,
In 6CI pot welding, so-called automatic welding equipment, where the guide bin has an attractive magnetic force when the electrode is moved, it is possible to prevent nuts etc. from easily falling from the electrode and causing damage. Is it common to fully operate the movable electrode after placing a nut or the like on the steel plate part?1 In the present invention, the nut or the like is held on the electrode and welded to the target location. As shown in the figure, it is possible to weld steel plate parts of any rotation, making it very suitable for use in automated fins such as automobiles.6 Furthermore, the force applied to the guide bin in the ejection direction depends on the total air pressure. However, according to the present invention, according to the present invention, the nuts, etc. are not guided. Since it is made in a bottle, such things can be definitely prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, the 11th to 4th factors are longitudinal sectional side views, and FIG. 5 is an external view. il side view 05... Guide bin, 7, 11, 14. 15... Means for applying attractive magnetic force 0

Claims (1)

[Claims] An electrode for spot welding, characterized in that an attractive magnetic force is applied to a guide pin, and the attractive magnetic force is arbitrarily demagnetized.