JPH0532278Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field of the invention> The invention has a locking body on one side of the flange body, such as a stud or a fastener, and the back side of the flange body is attached to the mounting plane. The present invention relates to a resin rotary welding member that is rotated at high speed while pressed and melted by frictional heat between the mounting plane and the back surface of the flange body and fixed to the mounting plane.

<Prior Art> Conventionally, a rotary welding member 1 such as a fastener shown in FIG. 6, for example, has a disc-shaped flange body 2, engaging protrusions 3, 3 protruding laterally from the flange body 2,
A locking body 4 protruding from the center of the flange body 2 was integrally molded of synthetic resin.

Then, as shown in FIG. 7, the rotary welding member 1 is placed on the mounting plane A of the substrate 5 made of synthetic resin, etc., and the inner wall of the chuck portion 7 at the tip of the rotary welding machine 6 is attached to the locking body 4 of the rotary welding member 1. While pressing the flange body 2 against the mounting plane A, insert the engaging protrusions 3, 3 of the rotary welding member 1 into the engaging grooves 8a, 8a of the engaging cylinder portion 8 at the tip of the rotary welding machine 6. When the engaging cylinder part 8 is rotated at high speed, the engaging protrusions 3, 3 are engaged with the engaging grooves 8a, 8a, and the rotary welding member 1 is also rotated at high speed together with the engaging cylinder part 8. Therefore, the contact surfaces between the mounting plane A and the back surface of the flange body 2 are welded together by rotational frictional heat, resulting in a mutually welded state. When the rotation is stopped, the welded resin cools and hardens, and as a result, the flange body 2 of the rotary welding member 1 is fixed to the mounting plane A inseparably.

In this way, when the rotary welding member 1 is fixed to the substrate 5, for example, in the case of a fastener, the lower end 4a of the locking body 4 is attached to the edge of the hole 11 of the plate 10, as shown in FIG. This is used for attaching the plate 10 by pushing it in while bending it inward, passing it through the hole 11, and locking the edge of the hole 11 at the stepped portion 4b by the elastic return of the lower end 4a of the locking body 4. .

<Problems to be Solved by the Present Invention> However, in such a rotary welding member 1, the flange body 2 is required to be easily melted, whereas the locking body 4 is required to be easily melted. 8th
In order to provide strength when attaching the plate 10 as shown in the figure, high hardness is required.

However, since the conventional rotary welding member 1 is integrally molded from the same synthetic resin material as described above, if the rotary welding member 1 is made of a material with a high melting degree to facilitate welding, the locking will be difficult. There is a problem that the mounting strength of the body 4 becomes weak and the plate 10 comes off.On the other hand, if the rotary welding member 1 is made of a material with high hardness in order to strengthen the mounting strength, even if rotary welding is attempted, the flange body 2
The substrate 5 does not melt easily, making welding difficult, and the substrate 5 may bend or bulge during long-term press rotation.

The object of the present invention is to provide a rotary welding member that solves these problems.

<Means for solving the above problems> In order to solve the above problems, in the rotary welding member of the present invention, the center of the surface side of the disc-shaped flange body 22 having a plurality of engaging protrusions on the outer periphery is provided. A columnar part 23 having a perfect circular cross section and having a retaining part 23a at the tip.
a resin base 21 having a hardness greater than that of the base 21 and having an inner wall surface that is rotatably fitted to the columnar part 23 relative to the columnar part 23 of the base 21; The locking body 31 is created separately, and the locking body 31 is attached to the columnar part 23.
The locking body 31 is attached to the flange body 22 by being rotatably and non-removably fitted to the chuck of the rotary welding machine.
When the engaging protrusion of the flange body 22 is pressed and rotated to engage and rotate the engaging protrusion of the flange body 22 with the engaging cylinder portion of the rotary welding machine, the flange body 22 and the engaging body 31 rotate relative to each other. It is characterized by the fact that it is made to do so.

<Function> Since this is a resin rotary welding member, after the locking body 31 is fitted to the columnar part of the base to integrate the base 21 and the locking body 31, the chuck of the rotary welding machine is Press the locking body 31 with the part to attach the base 21 to the mounting surface.
When the back surface of the flange body 22 is pressed and the engaging protrusion on the outer periphery of the flange body 22 is engaged and rotated by the engaging cylinder part of the rotary welding machine, the flange body 22 and the mounting surface are bonded together by frictional heat. It melts and welds. The base 21 and the locking body 31 are constructed separately, and their fitting surfaces are configured to be rotatable with respect to each other. Therefore, during the high-speed rotation, the base 21 and the locking body 31 are Since they can rotate freely, stress between them is eliminated, and welding to the mounting surface can be easily performed by rotating at high speed without applying excessive force.

Since the base 21 and the locking body 31 are constructed as separate bodies, by manufacturing the locking body 31 by selecting a resin whose hardness is larger than that of the base 21, the base 2
1, the flange body 22 is easily welded to the mounting surface by frictional heat, and the locking body 31 can be mounted to the mounting plate with appropriate strength.

<Embodiment of the present invention> An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the base 21 of the rotary welding member, in which a is a perspective view, b is a sectional view, and c is a sectional view.
is a back view. In the figure, a flange body 22 is provided on the lower side of a base 21 in a flat plate shape, in this example a disk shape. A columnar portion 23 whose lower half is hollow is protruded from the upper central surface of the flange body 22 . Engagement protrusions 24a and 24b are provided at two locations on the peripheral surface of the flange body 22 separated by 180° from each other to protrude upward from the sides.

On the back side of the flange body 22, a plurality of protrusions 25, 25, .
6 is provided protrudingly. These protrusions 25, 25...
and the annular projection 26 both have the flange body 2 on the mounting surface.
This is a consideration so that the pressing force when pressing and rotating 2 is applied equally to the rotary welding member.

On the distal end side of the columnar part 23, there is a retaining part 23a having a substantially hemispherical upper end, which is connected to a separate retaining body 31 which will be described later.
It is provided in such a way that it can be fitted smoothly.

Further, a narrow neck portion 23b is formed below this retaining portion 23a, a tapered portion 23c is formed below the neck portion 23b, a small diameter cylindrical portion 23d is formed further below the neck portion 23b, and a small diameter cylindrical portion 23d is formed below the neck portion 23b. A large-diameter cylindrical portion 23f having an annular stepped portion 23e is formed in the cylindrical portion 23f.

Next, a locking body 31 fitted to this base 21
An example will be explained with reference to FIG. Figure a is a perspective view of the exterior, and figure b is a cross-sectional view.

The locking body 31 has a conical portion 32 . An opening 33 is provided at the upper end of this conical portion 32, and
Four cuts 34, 34, . . . are provided at 90° intervals. Moreover, at the lower end of the conical part 32,
A thin cylindrical portion 36 is provided to protrude so as to form a stepped portion 35 .

Furthermore, a cylindrical portion 37 is protruded from the inside of the conical portion 32 and has an inner diameter set to be approximately the same as the diameter of the small diameter cylindrical portion 23d of the base 21.

The base 21 is integrally molded from synthetic resin, but in order to make rotational contact with the mounting surface and melt the flange body 22 in an optimal state due to the frictional heat, the resin material is used for various mounting methods. Select and create according to the resin material of the surface.

The locking body 31 is also integrally molded from a synthetic resin, and the resin material is selected to have a hardness greater than that of the base 21 which has sufficient strength.

The retaining part 23a of the columnar part 23 of the base 21 is inserted from the rear side into the cylindrical part 33 of the locking body 31 created separately in this way, and is pushed into the upper inner wall of the conical part 32. , 34, . . . when the upper end 32a of the conical portion 32 is pushed open and penetrated upward, the upper end 32a of the conical portion 32 elastically returns to fit into the neck portion 23b, as shown in FIG. death,
The upper inner wall of the conical part 32 fits into the tapered part 23c, the cylindrical part 37 fits into the small diameter cylindrical part 23d, and the lower end 37a of the cylindrical part 37 fits into the annular step part 23e.
It will be in contact with. Therefore, since all the horizontal sections of the fitting surfaces of the locking body 31 and the columnar part 23 are perfect circles, the columnar part 23 and the locking body 31 are connected to the columnar part 2.
It is relatively rotatable around the axis of 3.

After the base 21 and the locking body 31 are fitted together in this manner, the conical portion 32 of the locking body 31 is chucked with the chuck portion 7 at the tip of the rotary welding machine 6, and then the engagement The engagement protrusions 24a, 24 of the flange body 22 of the base 21 are inserted into the engagement grooves 8a, 8a of the cylindrical portion 8.
b, and rotated at high speed while pressing the tip of the rotary welder 6 toward the substrate 5 side. By this,
The base 21 and the locking body 31 rotate at high speed.

At this time, the plurality of protrusions 25 and the annular protrusion 26 provided on the back side of the flange body 22 are evenly pressed and rotated against the substrate 5 and melted by frictional heat, and then the lower surface of the flange body 22 and The surfaces of the substrates 5 are melted by frictional heat and welded together. Then, it solidifies by cooling and becomes inseparable. During rotation, the base 21 and the locking body 31 rotate simultaneously while still in the fitted state, but since they can rotate relative to each other, the rotational speed of the base 21 is reduced by the friction of the flange body 22 with the base plate 5. When becomes small, the locking body 31 rotates idly with respect to the columnar portion 23, so that stress is not generated between the locking body 31 and the base 21.

After welding to the board 5 in this way, if the locking body 31 is inserted into the mounting hole 11 of the plate 10 as shown in FIG. When the lower end portion of the cylindrical portion bends inward and the stepped portion 35 passes through the mounting hole 12, it returns elastically and the stepped portion 35 comes into contact with the upper edge of the mounting hole 11, as shown in FIG. 36 is fixed to the inner wall of the mounting hole 12 in a pressed state.

Although one embodiment of the present invention has been shown above, the structure of the present invention is not limited to this embodiment, and the structure of the locking body and the base may be formed as long as they can be fitted to each other so as to be relatively rotatable. Various modifications are possible, and it goes without saying that it can be applied to, for example, umbrella-shaped, anchor-shaped fasteners, or cylindrical studs.

<Effects of the Present Invention> As explained above, in the rotary welding member of the present invention, the disk-shaped flange body 22 having a plurality of engaging protrusions on the outer periphery has a circular cross-section at the center of the surface side and a protrusion at the tip. a resin base 21 having a columnar part 23 with a stopper part 23a; and the base having an inner wall surface rotatably fitted to the columnar part 23 relative to the columnar part 23 of the base 21. A resin locking body 31 having a harder hardness than 21 is separately created, and the locking body 31 is attached to the columnar part 23.
The locking body 31 is attached to the flange body 22 by being rotatably and non-removably fitted to the chuck of the rotary welding machine.
When the engaging protrusion of the flange body 22 is pressed and rotated to engage and rotate the engaging protrusion of the flange body 22 with the engaging cylinder portion of the rotary welding machine, the flange body 22 and the engaging body 31 rotate relative to each other. Because of this feature, the flange body 22 can be easily welded to the substrate 5, and the attachment strength of the locking body 31 can be increased.

In addition, since the base 21 and the locking body 31 can rotate idly with respect to each other, the base 21 and the locking body 31 can rotate freely when welding by rotation.
Since no stress is generated during the welding process, rotational welding is performed smoothly.

In addition, since the base 21 and the locking body 31 are fitted in a circular cross section, there is no directionality in fitting the locking body 31 and the base 21, so the fitting work is easy. This work can also be easily automated.

Further, for the same reason, the same holding force can be maintained no matter from which direction force is applied to the plate 10 attached to the locking body 31, and the strength against shearing force is also increased.

[Brief explanation of the drawing]

Fig. 1a is a perspective view showing a base of an embodiment of the present invention, Fig. 1b is a sectional view thereof, Fig. 1c is a bottom view thereof,
FIG. 2a is a perspective view showing a locking body according to an embodiment of the present invention, FIG. 2b is a sectional view thereof, FIG. The figure is a cross-sectional view showing a state of rotary welding by a rotary welding machine, and FIG. 5 is a cross-sectional view showing a state in which a plate is attached. FIG. 6 is a perspective view showing a conventional resin rotary welding member, FIG. 7 is a sectional view showing its rotary welding operation, and FIG. 8 is a sectional view showing a state in which a plate is attached to a columnar part. 21... Base, 22... Flange body, 23...
Columnar part, 31... Locking body, 32... Conical part, 37
...Inner cylinder part.

Claims (1)

[Scope of Claim for Utility Model Registration] A flange body having a plurality of engaging protrusions on its outer periphery and rotary welded to a mounting plane by a rotary welding machine, and a mounting hole provided at the center of the surface side of the flange body. and a locking body for locking the mounting plate by being inserted into the rotary welding machine, and with the chuck of the rotary welding machine pressing the locking body toward the mounting plane and pressing the flange body against the mounting plane, Resin rotary welding, in which the engaging protrusion is engaged with an engaging cylinder part of a rotary welding machine, the engaging part is rotated at high speed, and the back surface of the flange body is welded to the mounting plane by rotational frictional heat. In the member, a resin base having a columnar part 23 having a circular cross section and a retaining part 23a at the tip at the center of the surface side of a disc-shaped flange body 22 having a plurality of engaging protrusions on the outer periphery. 21, and a resin locking body 31 having a hardness greater than that of the base 21 and having an inner wall surface that is rotatably fitted to the columnar part 23 of the base 21. The locking body 31 is attached to the columnar part 23.
The locking body 31 is attached to the flange body 22 by being rotatably and non-removably fitted to the chuck of the rotary welding machine.
When the engaging protrusion of the flange body 22 is pressed and rotated to engage and rotate the engaging protrusion of the flange body 22 with the engaging cylinder portion of the rotary welding machine, the flange body 22 and the engaging body 31 rotate relative to each other. A resin rotary welding member characterized in that: