JPH0247761Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a projection welded nut structure.

[Prior art]

4a and 4b are diagrams showing an example of a conventional projection weld nut (hereinafter referred to as a weld nut), in which the nut body 1a of the weld nut 1 is
is formed into a substantially cubic shape, and the threaded portion 2
A projection 4 is formed at the corner of the nut body 1a for melting and welding the nut body 1a to the panel 3 (see FIGS. 5 and 6) during resistance welding. Further, a ring-shaped U groove 6 for punching out the panel 3 with a punch 5 is formed on the panel abutting surface 1b of the nut body 1a.

Next, a welding method using a weld nut welding device will be described with reference to FIGS. 5 and 6.

First, the panel 3 is transported to a predetermined position above the lower electrode 7 using a transport tool (not shown), and then
The panel 3 is placed on the lower electrode 7. Next, the weld nut 1 is attracted by an electromagnet (not shown) of the upper electrode 8 and carried onto the lower electrode 7.
The weld nut 1 is pressurized between the upper electrode 8 and the lower electrode 7 on the panel 3, and electricity is applied to the weld nut 1 and the panel 3, which are objects to be welded, from a welding power source via both electrodes 7 and 8. As a result, the projection 4 of the weld nut 1 is melted, and the weld nut 1 is welded to the panel 3.

Next, the power to the workpiece is cut off, and the punch 5
6, and press the punch tip 5 upward.
Punch out panel 3 using a. That is, the punch tip 5a has a ring shape that corresponds to the U groove 6 of the weld nut 1, and as the punch 5 rises, the punch tip 5a enters the U groove 6, and thus the panel 3
is punched out. The punched panel piece 3a is inserted into the hole 5b of the punch 5 by moving the pin 11 in the upper electrode 8 downward by a drive device (not shown).
fallen inside. In this way, the work of welding the weld nut 1 to the panel 3 is completed.

However, due to the shape and structure of the conventional weld nut 1, the provision of the U-groove 6 makes it larger and heavier than the ordinary projection weld nut 12 shown in FIG.
In addition, there were also problems such as positioning of the weld nut during welding and drilling.

[Problem that the invention attempts to solve]

The object of the present invention was made in view of the above-mentioned drawbacks, and is to provide a weld nut that is smaller and lighter, and that improves positioning accuracy during projection welding.

[Means for solving problems]

In order to achieve this purpose, the present invention
A cut-out part shaped like a notch is formed by a cut-out means on the outer periphery of the cylindrical nut body, and a projection is formed, and a ring-shaped U is formed on the panel contact surface.
It has a structure in which grooves are formed.

Hereinafter, details of the present invention will be explained using examples shown in the drawings.

[Example of idea]

Figures 1a and 2b and Figures 2a to d show an embodiment of the weld nut according to the present invention, where Figure 1a is a perspective view when viewed diagonally from above, and Figure 1b is a perspective view from diagonally below. Figure 2a is a front view, Figure 2b is an upper plan view, Figure 2c is a lower plan view,
Figure d is a side view. The nut body 13a of the weld nut 13 of this embodiment is formed in a cylindrical shape, and a ring-shaped U groove 14 is formed in the panel contact surface 13b with the panel 3 (see FIGS. 5 and 6). In addition, four cut-out portions 15 are formed at regular intervals on the outer peripheral side surface of the nut body 13a. That is, the cutout portion 15 is formed into a circular notch shape by pressing (by pressing) into a semicircular arc shape (not shown), and by forming the cutout portion 15 by this cutting means, the nut can be tightened. A projection 16 is formed below the side surface of the main body 13a.

The side surface of the cylindrical nut main body 13a serves as a positioning surface over the entire outer circumference, and the cutout portion 1
As shown in FIG. 3, the weld nut 13 is positioned by fitting a protrusion 17a provided on the inner peripheral side of the lower end of the upper electrode 17.

Therefore, when welding the weld nut 13 configured as described above onto the panel 3, first, the panel 3 is transported to above the lower electrode (not shown) using a transport tool (not shown) and positioned at a predetermined position. After that, the panel 3 is placed on the lower electrode. Next, as shown in FIG. 3, the weld nut 13 is attached to the upper electrode 17 so that the cut-out part 15 fits into the protrusion 17a of the upper electrode 17, and the weld nut 13 is carried over the lower electrode. 13 is pressurized between the upper electrode 17 and the lower electrode, and current is applied to the weld nut 13 and panel 3, which are the objects to be welded, from a welding power source via both electrodes. As a result, the projection 16 of the weld nut 13 is melted and the weld nut 13 is attached to the panel 3.
is welded to.

Next, the power to the object to be welded is cut off, a punch (not shown) is pushed upward, and the panel 3 is punched out with the tip of the punch. That is, the tip of the punch has a ring shape that corresponds to the U-groove 14 of the weld nut 13, and as the punch rises, the tip of the punch enters the U-groove 14, thereby punching out the panel 3 and filling the hole of the punch. will be dropped. By this,
The welding work of the weld nut 13 is completed. As described above, since the weld nut 13 of this embodiment has a cylindrical shape, it can be made smaller and lighter in weight than the conventional weld nut, even though the U-groove 14 is provided. Furthermore, the side surface of the cylindrical nut body 13a serves as a positioning surface over the entire outer circumference, and by using it in combination with the cutting part 15, it is possible to improve positioning performance during projection welding. can.

In the above-described embodiment, the projections 16 are provided at four locations at regular intervals in the circumferential direction of the nut body 13a, but the invention is not limited to this. It may also have a shape that extends all the way around.

[Effect of idea]

As explained above, according to the projection welded nut structure according to the present invention, a cut-out portion having a cut-out shape is formed on the outer periphery of the cylindrical nut main body by the cut-out means, and a projection is formed, and Since it has a structure in which a ring-shaped U groove is formed on the panel contact surface, it is smaller and lighter than conventional weld nuts, which not only expands the range of applications but also improves positioning during welding and drilling. It has various excellent effects such as being able to improve the

[Brief explanation of drawings]

Figures 1a and 1b show an embodiment of the projection welding nut according to the present invention, where figure a is a perspective view when viewed diagonally from above, and figure b is a perspective view when viewed diagonally from below. Figure 2a is a front view of the projection weld nut, Figure 2b is an upper plan view, Figure 2c is a lower plan view, Figure 2d is a side view,
FIG. 3 is an explanatory diagram of welding and drilling operations for a projection welding nut, FIGS. 4a and 4b are upper and lower perspective views showing an example of a conventional projection welding nut, and FIGS. FIG. 6 is an explanatory diagram of welding and drilling operations of a conventional projection weld nut, and FIG. 7 is an upper perspective view and a lower perspective view of a conventional projection weld nut. 13... Weld nut, 13a... Nut body, 13b... Panel contact surface, 14... U groove, 1
5...Kirishibu, 16...Projection.

Claims (1)

[Scope of utility model registration request] A project characterized in that a cut-out part having a cut-out shape is formed on the outer periphery of a cylindrical nut body by means of a cut-off means, a projection is formed, and a ring-shaped U groove is formed on the panel contact surface. Excision welded nut structure.