JPH028622Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a nut welding jig used for welding a weld nut to a panel or the like.

[Prior art]

Conventionally, a welding device as shown in FIG. 1, for example, has been used to weld wild nuts (nuts with protrusions) to a workpiece such as an automobile body panel. In the figure, reference numeral 1 denotes a fixed electrode, which has a nut storage recess 1a at its tip. Reference numeral 2 denotes a movable electrode having a head 2a having a larger diameter than the nut which is the object to be welded. Reference numeral 3 designates a simple stationary type resistance welding machine transformer that supplies current between both electrodes 1 and 2. First, a weld nut _WN is dropped into the recess 1a of the fixed electrode 1 from above as shown in the figure. Next, support the workpiece W _P horizontally and connect the pre-drilled bolt hole 4 with the nut W _N
After adjusting the position, the movable electrode 2 is moved forward and applied directly to the workpiece W _P to apply pressure and electricity. Then, the protrusion of the weld nut W _N (protrusion)
A large current flows through 5, melting it, and the nut _WN becomes the workpiece.
Welded to W _P.

However, such conventional nut welding jigs are dedicated jigs used only for welding weld nuts, so a common welding gun can also be used for welding other parts besides nuts. It was inconvenient and impossible to do so. Also,
Because it was meant to hold the nut horizontally,
There is a problem in that the posture of the nut welding part of the workpiece (panel) is limited to a horizontal or almost horizontal posture, as shown in FIG.

[Purpose of invention]

This idea was devised by focusing on these conventional problems, and was developed to create a nut welding jig that can be used with a general-purpose welding machine and that allows workpieces to be welded in any position. By providing this, the aim is to solve the above problems.

[Structure of the idea]

This invention to achieve the above object includes a back bar interposed between a panel and a nut to be welded and a pair of welding chips that sandwich this, and one of the back bars has an insulating nut insertion hole. This nut welding jig is characterized in that it has a floating conductor that is elastically supported so as to be separable from the top of the nut via a nut holding member.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the drawings. 2 to 5 are diagrams showing an embodiment of this invention.

First, the structure will be described. Reference numeral 10 denotes a jig stand, which is equipped with a workpiece receiver 12 having a locate pin 11 for positioning a panel W _P , which is a workpiece. 13
is a fixed backing bar, in this example, the workpiece
It is attached to the jig stand 10 via a support 15 so as to come into contact with the back surface of the rising portion 14 of the W _P. 1
Reference numeral 6 denotes a movable back bar that is paired with the fixed back bar 13, and is connected to the support 1 erected on the jig stand 10.
The arm 20 is fixed to the tip of an arm 20 which is pivotally supported by the arm 7 and can be rotated and retracted by an actuator, for example, an air cylinder 19. As will be described later, this movable back bar 16 has a weld nut.
It is now possible to input and hold W _N. In other words, the workpiece W consisting of the weld nut _WN and the workpiece _WP is different from the conventional one, in that both the back bars 1
3, 16, a pair of welding tips 22,
23 (FIG. 3).

FIG. 4 is a sectional view showing details of the movable back bar 16. In the figure, 24 is arm 2
The casing is fixed to the tip of the 0, and the top surface is open. Reference numeral 25 denotes a nut holding member installed within the casing 24, which is made of an electrically insulating material to prevent branching of effective current during welding.
A nut insertion opening 2 is provided on the side wall of the nut storage recess 25a.
5b is provided. 26 is this nut holding member 2
5 is a floating conductor mounted inside the casing 24. The shaft portion 26a is inserted into a through hole 25c formed in the axial center of the nut holding member 25, and the flange portion 26b and the nut holding member 2
A plurality of elastic members (for example, compression coil springs, etc.) 27 are interposed between the spring 5 and the spring 5. That is, the floating conductor 26 is elastically supported within the casing 24 via the nut holding member 25 so as to be able to move into and out of contact with the top of the nut _WN . 28 is an insertion opening for the welding tip 22. Note that the fixed back bar 13 and the floating conductor 26 are preferably formed of a good conductor such as copper material.

Next, the action will be explained.

When the work W _P is set in line with the locate pins 11 of the jig stand 10, the fixed back bar 13 comes into contact with the back surface of the part to be welded of the work. Next, by the action of the air cylinder 19, the movable back bar 16
Rotate from the retracted position to the welding position. In this state, the weld nut _WN is inserted into the nut storage recess 25a from the nut insertion opening 25b of the movable back bar 16 (see FIG. 5). In the illustrated example, when welding a nut to a rising portion, the nut is inserted from above; however, when welding to a horizontal portion, for example, the nut is inserted from the side. The point is that the work W _P is vertical
No matter the position, horizontal or tilted, the nut
By sliding W _N along the workpiece W _P surface, it can be inserted easily and reliably. After inserting the nut, the operator uses a well-known general-purpose welding gun to weld the back bars 13, 16 with the welding tips 22, 23.
Clamp and pressurize. Thereby, after the floating conductor 26 is pressed against the top of the weld nut _WN , when electricity is applied, the workpiece _WP and the nut _WN are welded at the projection 5 portion. When the welding tips 22, 23 are released, the floating conductor 26 returns to its original position due to the restoring force of the elastic member 27 and separates from the top of the nut. The movable back bar 16 is rotated again to the retracted position. If necessary, the operator can perform spot welding work on other parts of the work W _P on the jig table 10 using the same welding gun. Since welding is carried out via the back bars 13 and 16, no indentations will occur even if a special welding gun is not used.

Note that the fixed back bar 13 in the above embodiment
Then, the relative positions of the object to be welded W and the movable back bar 16 are reversed, and the movable back bar 16 is fixed to the jig table 10, while the fixed back bar 13 can be evacuated by the action of an air cylinder. It may also be configured to rotate. In that case, work
Nut welding can be performed on the opposite side without having to take the trouble of reversing the W _P or resetting it in another welding jig.

[Effect of idea]

As explained above, according to this idea,
Since the nut held by the holding member is welded via the back bar, the general-purpose welding gun can also be used for nut welding, and the posture of the nut welding part of the workpiece can be set arbitrarily.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the main part configuration of a conventional nut welding jig, Figs. 2 to 5 show an embodiment of this invention, Fig. 2 is a front view of the overall structure, and Fig. 3 is a welding jig. 4 is a view taken along the - arrow in FIG. 3, and FIG. 5 is a perspective view of the main parts. W _P ... Panel, W _N ... Nut, W... Welded object, 13, 16... Back bar, 22, 23...
Welding tip, 25... Nut holding member, 25b...
...Nut insertion port, 26...Floating conductor.

Claims (1)

[Scope of utility model registration request] A back bar is provided between the object to be welded consisting of a panel and a nut and a pair of welding chips that sandwich it, and one of the back bars is separated from the top of the nut through an insulating nut holding member having a nut insertion opening. A nut welding jig characterized by having a floating conductor that is elastically supported so that it can be contacted.