JPH0349830Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a welding device that enables spot welding of welding points requiring small-diameter electrodes using an ordinary spot welding gun.

BACKGROUND TECHNOLOGY A hot mail is used to attach an automobile floor seat to a floor panel. As shown in Fig. 3, this hot mail A has a bottomed cylindrical part B,
It consists of a flange portion C integrally formed at the bottom of the cylindrical portion B. To fix the floor sheet to the floor panel using this hot mail A,
As shown in FIG. 4, the hook mail A is fixed at a predetermined position on the floor panel D by spot welding, and a cap F that fits into the cylindrical portion B of the hook mail A is placed on the floor sheet E at a position facing the hook mail A. Install. After that, the floor sheet E is fixed to the floor panel D by fitting the cap F into the cylindrical part B of the hook mail A.

The fixation of the above-mentioned hot mail A to the floor panel D is performed by spot welding. In this spot welding, as shown in FIG. Position panel D at a predetermined position. In this state, the upper electrode 3 and lower electrode 4 of the spot welding gun are brought into pressure contact with the bottom of the hot mail A and the lower surface of the floor panel D, respectively, and by energizing both electrodes 3 and 4, the hot mail A is spotted on the floor panel D. Welding.

Problems to be solved by the invention As mentioned above, when the hot mail A is fixed to the floor panel D by spot welding, it becomes necessary to insert the upper electrode 3 of the spot welding gun into the cylindrical part B of the hot mail A. . In this case, since the hot mail A is a small component and the diameter of the cylindrical part B is small, in order to insert the upper electrode 3 into the cylindrical part B, the diameter of the upper electrode 3 must be approximately 4 mm or less. No. However, some ordinary spot welding guns do not have such small-diameter electrodes, so in order to spot-weld hot mail A to floor panel D by the above method, it is necessary to have an upper electrode 3 with a small diameter. The problem was that a special spot welding gun had to be prepared, which resulted in high equipment costs. Further, when the diameter of the upper electrode 3 is made small in this way, there is a problem in that the upper electrode 3 has to be frequently replaced because the upper electrode 3 is subject to severe wear.

Means for solving the problem: A support arm that movably supports a welding device used for spot welding the bottom surface of a small-diameter member that is cylindrical with a bottom and has a small inner diameter and another member. a cylindrical first positioning member fixed to the tip of the support arm and having an insulating material attached to its inner peripheral surface; and a cylindrical first positioning member fixed to the lower inner peripheral surface of the first positioning member; a second positioning member having an inner diameter substantially equal to the outer diameter of the small diameter member and having a magnet or a spring for holding the small diameter member on the inner circumferential surface; and a dedicated positioning member that is detachably inserted into the first positioning member. A flat end portion is formed at the upper end of the special electrode to contact the upper electrode of the spot welding gun, and a flat end portion is formed at the lower end to contact the upper electrode of the spot welding gun, and the tip thereof is a bottom surface of the small diameter member. A small diameter portion is formed in contact with the

Operation The small-diameter member in the shape of a cylinder with a bottom is held by the second positioning member of the welding device, and the small-diameter member is placed in a predetermined position on the floor panel with the tip of the small-diameter part of the dedicated electrode in contact with the bottom of the small-diameter member. In this state, the lower electrode of a regular spot welding gun is brought into contact with the lower surface of the floor panel, and the upper electrode is brought into contact with the flat part provided on the upper part of the dedicated electrode, thereby performing spot welding.

Embodiment FIG. 1 shows a welding device 10 according to the present invention, in which reference numeral 11 indicates a rotatably supported support arm, and 12 indicates a cylindrical first positioner fixed to the tip of the support arm 11. A member 13 is a cylindrical second positioning member fixed to the lower inner peripheral surface of the first positioning member 12 with an insulator 14 interposed therebetween. This second
The inner diameter of the positioning member 13 is approximately the same as that of the cylindrical portion B of the hook mail A, and a magnet 15 or a ring-shaped spring (not shown) is incorporated in the inner peripheral surface. By inserting the cylindrical portion B of the hook mail A into the second positioning member 13, the hook mail A is held by the second positioning member 13. Reference numeral 16 denotes a dedicated electrode for hot-mail welding, which is detachably inserted into the first positioning member 12 via the insulator 14. At the bottom of this special electrode 16, there is a small diameter part 16a which is smaller in diameter than the cylindrical part B of the hot mail A and whose tip contacts the bottom of the cylindrical part B, and at the upper part, a normal spot welding gun is provided. A flat portion 16b is provided that can be contacted by the upper electrode.

In the above configuration, in order to spot-weld the hot mail A to the floor panel D using the welding device according to the present invention, first, the support arm 11 is rotated counterclockwise in the figure, and then the second positioning member 13 is
Insert the cylindrical part B of the hot mail A into the hole, hold the hot mail A by the second positioning member 13, and at the same time hold the bottom of the cylindrical part B of the hot mail A.
It is brought into contact with the tip of the small diameter portion 16a of the dedicated electrode 16. Next, the support arm 11 is rotated clockwise in the figure, and the second positioning member 13 is rotated as shown in FIG.
The hook mail A is positioned on the floor panel D by bringing the flange portion C of the hook mail A held by the floor panel D into contact with the floor panel D. Next, as shown in FIG. 2, the upper electrode 20 of the ordinary spot welding gun is placed on the flat part 16b of the dedicated electrode 16, and the lower electrode 21 is placed on the floor panel D.
Press them against the bottom surface of each. In this state, electricity is applied between the upper electrode 20 and the lower electrode 21 of the spot welding gun via the dedicated electrode 16.
Spot weld hot mail A to floor panel D. After that, the upper electrode 20 of the spot welding gun
from the dedicated electrode 16 and the lower electrode 21 from the floor panel D, and in this state, rotate the support arm 11 counterclockwise in the figure to remove the second positioning member 13 from the cylindrical part B of the hook mail A. Just let it happen. Note that when the small diameter portion 16a of the dedicated electrode 16 is worn out due to welding work, only the dedicated electrode 16 needs to be replaced. Further, in the above embodiment, an example was explained in which the hot mail A is spot welded by the welding device 10 according to the present invention.
It can also be applied to spot welding of small-diameter members having the shape of a cylinder with a bottom.

Effects of the invention As described above, the present invention holds the hook mail by the second positioning member of the welding device, inserts the small diameter part of the dedicated electrode into the cylindrical part of the hook mail, and contacts the tip of the hook mail with the bottom of the hook mail. After that, position the hot mail in a predetermined position on the floor panel, and in this state, bring the upper electrode of a regular spot welding gun into contact with the flat end provided on the upper part of the special electrode, and then place the lower electrode on the floor panel. The hot mail is welded to the floor panel by contacting it with the underside of the floor panel.

That is, the present invention enables spot welding of the bottom of a small-diameter member, which has a cylindrical shape with a bottom and whose inner diameter is smaller than the outer diameter of the electrode of a normal spot welding gun, with another member, without using the conventional small-diameter welding method. The above-mentioned welding work can be performed using a normal spot welding gun without using a spot welding gun dedicated to small diameter members having an upper electrode having a smaller diameter than the inner diameter of the member.

By making it possible to spot weld small-diameter parts using a normal spot welding gun, it is no longer necessary to prepare a dedicated spot-welding gun for spot-welding small-diameter parts, and equipment costs can be reduced. This is to curb the soaring price of

In addition, the small diameter electrode that comes into contact with the bottom of the small diameter member is subject to very severe wear, but in the case of the present invention, the dedicated electrode that has the small diameter part that comes into contact with the bottom of the small diameter member is
Since it is removably attached to the positioning member, replacement work is very easy, and work efficiency is improved compared to using a conventional spot welding gun dedicated to small diameter members.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a welding device according to the present invention;
FIG. 2 is a sectional view showing the state when spot welding is performed by the welding device. Figure 3 is a cross-sectional view of the hot mail, Figure 4 is a cross-sectional view showing the state when the floor sheet is fixed to the floor panel with the hot mail, and Figure 5 is a cross-sectional view showing a conventional example of spot welding the hot mail to the floor panel. It is a diagram. 10... Welding device, 11... Support arm, 12
...First positioning member, 13...Second positioning member, 16...Dedicated electrode, 16a...Small diameter portion,
16b...Flat area, A...Hotsukumer, B...
Cylindrical part.

Claims (1)

[Scope of Claim for Utility Model Registration] A support arm that movably supports a welding device used for spot welding the bottom surface of a small-diameter member having a cylindrical shape with a bottom and a small inner diameter to another member. a cylindrical first positioning member fixed to the tip of the support arm and having an insulating material attached to its inner peripheral surface; and a cylindrical first positioning member fixed to the lower inner peripheral surface of the first positioning member; a second positioning member having an inner diameter approximately equal to the outer diameter of the small diameter member and having a magnet or a spring for holding the small diameter member on the inner circumferential surface; and a dedicated positioning member that is detachably inserted into the first positioning member. A flat end portion is formed at the upper end of the dedicated electrode to contact the upper electrode of the spot welding gun, and a flat end portion that is in contact with the upper electrode of the spot welding gun is formed at the lower end, and the tip thereof is the bottom surface of the small diameter member. A welding device characterized in that a small diameter portion is formed in contact with the welding device.