JPH025495B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an assembly of a panel and a so-called pierce nut, in which the pilot part of the nut functions as a punch for punching an opening in the panel, and an assembly apparatus for the same. be.

PRIOR TECHNOLOGY Piercing nuts are used in large quantities, especially in the automobile industry, and the pilot part provided in the center of the nut body functions as a punch for punching an opening in a panel. It has the excellent feature of not requiring pre-prepared mounting holes, but it has a drawback in terms of fastening force. Various so-called high-stress type earring nuts have been proposed that solve these drawbacks and have increased fastening force. However, all of the conventional high-stress type pierce nuts have had problems such as an increase in the size of the nut body, an increase in weight, and a restriction in the installation space.

In addition, conventional pierced nuts have the limitation that the bolt must be inserted from the pilot part side due to the structure of the connection with the panel.Furthermore, the sealing performance of the connection part is incomplete, and the connection There was also the inconvenience that water and other liquids leaked from the parts, causing rust and dirt on the nut and panel assembly.

Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned problems, and its purpose is to make the nut itself smaller and lighter than conventional high-stress piercing nuts, while still To provide a nut-panel assembly and an assembly device thereof, which are strongly and reliably connected to a panel and have an excellent sealing function.

Means for Solving the Problems In order to achieve the above object, in the present invention, between the pilot part 3 and the flange part 5 of the nut 1, there is a part having a diameter larger than the pilot part 3 and at the boundary with the pilot part 3. A body part 4 having an annular shoulder part 6 is provided, and a peripheral part 12 of an opening 11 punched in the panel 10 by the pilot part 3 extends from the flange part 5 to the nut 1.
The flange portion 5 is bent along the outer periphery of the flange portion 5, and the contour shape of the flange portion 5 is in close contact with the outer peripheral edge 7, which is non-circular. The nut 1 is coupled to the panel 10 by sandwiching and fixing the opening edge 12a between the flanged protrusion 13 and the flange 5.

The second invention relates to an assembly device for assembling the above nut 1 and panel 10, and includes a push die for punching an opening 11 in the panel 10 in cooperation with the pilot part 3 of the nut 1. A cylindrical floating die 18 is fitted around the cylindrical floating die 16 so as to be slidable in the axial direction, and an elastic body 22 is provided to push the floating die 18 upwardly.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

1 and 2 show a pierce nut 1 according to the present invention, and FIG. 3 shows the nut 1 in an assembled and used state connected to a panel 10.

The nut 1 consists of a pilot part 3, a body part 4, and a flange part 5, which are provided concentrically with a screw hole 2.
The end surface of the pilot part 3 functions as a punch for punching an opening 11 in the panel 10, and the body part 4 has a larger diameter than the pilot part 3 and is provided with an annular shoulder part 6 at the boundary with the pilot part 3, and has a flange part. 5 has an outer diameter larger than that of the body 4, has a rectangular outer peripheral edge 7, and has a support surface 8 extending substantially perpendicular to the axis at the boundary with the body 4.

As shown in the figure, it is advantageous to provide an annular recess 9 on the lower circumferential side of the body 4, since the opening edge 12a can be easily and reliably clamped and fixed when the panel 10 is connected to the panel 10, which will be described later. be.

4 to 8 show an assembly device 15 for connecting the nut 1 to the panel 10 and its operating steps. The assembly device 15 includes a push die 16 which has a die hole 17 into which the pilot part 3 is fitted, and whose outer diameter is larger than the outer diameter of the flange part 5;
A cylindrical floating die 18 is fitted onto the pushing die 16 so as to be slidable in the axial direction. The pushing die 16 is fixedly disposed on a die holder 19, but the floating die 18 has a guide groove 20 provided on its outer wall engaged with a locking pin 21 attached to the die holder 19, so that the upper end surface of the floating die 18 is fixed to the die holder 19. It is disposed so as to be able to move up and down within a certain range in a posture that protrudes upward from 16, and is biased upward via a push plate 23 by an elastic body 22 such as urethane disposed below. A pressure punch 24 is provided above the push die 16 in opposition to it.

First, as shown in FIG. 4, the panel 10 is placed on the upper end surface of the floating die 18, and the nut 1 is placed in a position with the pilot part 3 in contact with a predetermined position on the upper surface.
is supplied.

Next, the pressure punch 24 descends and presses the nut 1, press-fits the panel 10 into the cylindrical hole of the floating die 18 and deforms it into a concave shape, while pushing the floating die 18 into the elastic body 22 and pushing it down (first 5), when the recessed panel portion 10a comes into contact with the push die 16, the pilot portion 3 of the nut 1 and the die hole 17 of the push die 16 cooperate as shown in FIG. , an opening 11 is punched in the recessed panel portion 10a. Furthermore, nut 1 is pressurized punch 2
4, and is pushed down until the shoulder 6 of the body 4 comes into contact with the upper end surface of the push die 16.
At this time, the peripheral edge portion 12 of the opening 11 is bent into a cylindrical shape extending from the flange portion 5 along the outer periphery of the nut 1 (see FIG. 7). Further, when the nut 1 is pressed by the pressure punch 24, as shown in FIG. A flange-like protrusion 13 is formed by bulging outward in the radial direction. Then, the brim-like protrusion 13 and the flange 5 clamp and fix the opening edge 12a of the peripheral edge portion 12, and at the same time, the peripheral edge portion 12
The nut 1 is connected to the panel 10 in close contact with the nut 1, and the nut and panel assembly is completed.

As shown in the figure, if an annular recess 9 is provided between the body 4 and flange 5 of the nut 1,
This is actually effective because the opening edge 12a of the peripheral portion 12 can be easily inserted between the flange portion 5 and the brim-like protrusion portion 13.

The assembly of the nut 1 and panel 10 connected as described above is normally used by inserting the mating bolt 25 into the screw hole 2 from the driving direction of the nut 1, as shown in FIG. However, depending on the case, it is also possible to use the bolt 25 by inserting it into the screw hole 2 from the opposite side.

Effects of the Invention As explained above, in the nut and panel assembly according to the present invention, the opening edge 12a of the opening peripheral portion 12 of the panel 10 squeezes the body 4 of the nut 1 and causes it to bulge and deform in the radial direction. The flanged protrusion 23 formed by the flange 5 is sandwiched and fixed, and the opening periphery 12 is tightly surrounded by the outer periphery 7 of the flange 5, which has a non-circular outline. The joining of the panels 10 is strong and reliable, and the sealing properties of the joined parts are also excellent.

Furthermore, the nut itself is smaller and lighter than conventional high-stress type piercing nuts, and has a simpler structure, making it easier to manufacture and process. Furthermore, since the bolt 25 that fits into the nut 1 connected to the panel 10 can be inserted and fastened from either the flange portion 5 side or the pilot portion 3 side,
It is convenient in use.

[Brief explanation of drawings]

FIG. 1 is a front view of the earring nut according to the present invention;
FIG. 2 is a plan view of the same, FIG. 3 is a longitudinal sectional front view of the nut and panel assembly, FIG. 4 is a longitudinal sectional view of main parts of the assembly device according to the present invention, and FIGS. 5 to 8 are the same operating steps. FIG. DESCRIPTION OF SYMBOLS 1...Nut, 3...Pilot part, 4...Body part, 5...Flange part, 6...Shoulder part, 7...Outer periphery, 8...Supporting surface, 10...Panel, 11...Opening , 12...opening periphery, 12a...opening edge, 1
3... Flange-shaped protrusion, 15... Assembly device, 16...
Push die, 17...Dice hole, 18...Floating die, 22...Elastic body, 24...Pressure punch.

Claims (1)

[Scope of Claims] 1 The nut 1 has a cylindrical shape concentric with the screw hole 2 and has a pilot portion 3 whose end surface functions as a punch for punching an opening 11 in the panel 10;
The body part 4 has a larger diameter and has an annular shoulder part 6 at the boundary with the pilot part 3, and the body part 4 has an outer diameter.
The flange portion 5 is larger and has a non-circular outer peripheral edge 7 and a support surface 8 extending substantially perpendicular to the axis at the boundary with the body portion 4. , an opening 1 punched in the panel 10 by the pilot part 3
The peripheral edge portion 12 of the nut 1 is bent from the flange portion 5 along the outer periphery of the nut 1, and the outer peripheral edge 7 of the flange portion 5
The opening edge 12 is formed by the flange 5 and the brim-like protrusion 13 formed by squeezing the body 4 from the shoulder 6 to bulge outward in the radial direction.
An assembly of a nut and panel, characterized in that they are joined together by sandwiching and fixing a. 2. The nut and panel assembly according to claim 1, wherein the outer peripheral edge 7 of the flange portion 5 has a quadrangular or hexagonal outline. 3 A pilot part 3 having a cylindrical shape concentric with the screw hole 2 and whose end face functions as a punch for punching an opening 11 in the panel 10, and an annular shoulder having a larger diameter than the pilot part 3 and at the boundary with the pilot part 3. The body part 4 has a section 6, and the outer diameter dimension is larger than the body part 4, and the outline shape of the outer peripheral edge 7 is formed in a non-circular shape, and the boundary with the body part 4 is formed in a direction substantially perpendicular to the axis. An assembly device for coupling a nut 1 to a panel 10 with a flange portion 5 having an extending support surface 8, the nut having a die hole 17 into which a pilot portion 3 is fitted, and having an outer diameter of A pushing die 16 larger than the outer diameter of the flange portion 5 is formed into a cylindrical shape that is slidably fitted in the pushing die 16 in the axial direction, and is movable up and down with the upper end surface protruding upward from the pushing die 16. a floating die 18 arranged so that the floating die 18
The panel 10 is placed on the upper end surface of the floating die 18, and the pilot of the nut 1 is placed on the upper surface of the panel 10. Bringing the part 3 into contact position, Next, press the nut 1 with the pressure punch 24,
By pressing down the floating die 18 while deforming the panel 10 into the cylindrical hole of the floating die 18, the pilot part 3 of the nut 1 and the die hole 17 of the pushing die 16 cooperate to form the depression as described above. punching an opening 11 in the deformed panel portion 10a; a peripheral edge portion 12 of the punched opening 11 is bent from the flange portion 5 along the outer periphery of the nut 1 and comes into close contact with the outer peripheral edge 7 of the flange portion 1; Subsequently, the body 4 of the nut 1 is squeezed from the shoulder 6 with the upper end surface of the pushing die 16, and the excess flesh thereof is bulged and deformed radially outward to form the flange-like protrusion 13. A nut and panel assembling device including each of the above steps, including clamping and fixing the opening edge 12a between the brim-like protrusion 13 and the flange 5.