JPH075284Y2 - Stud fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a stud fixing structure for interior parts and the like, and more particularly to a stud fixing structure adapted to be fixed by using electromagnetic induction heating.

[Prior Art] For example, in an automobile interior part such as a door trim, a cushioning material and a film material are laminated on the surface of a base material serving as a core material, and a cloth, a carpet, or the like is applied to the surface. The decoration material is arranged. Then, for these interior parts, clips are fixed to the back surface of the base material via resin studs, and the interior parts are attached to predetermined parts in the vehicle by the clips.

By the way, as a conventional method for attaching studs to interior parts, a method using a hot melt adhesive,
In addition to a method using a rivet and a method using ultrasonic vibration heating, there is a method using electromagnetic induction heating, and these methods can be known from, for example, Japanese Patent Laid-Open No. 63-221032.

Among these methods, the conventional method by electromagnetic induction heating is, as shown in a state after being fixed in FIG. 7, a base material 50 and studs 51 that can be heated and melted, and a resin material that can be melted is also ferromagnetic. A film 52 containing powder is prepared. Next, for example, the film 52 is placed at a predetermined position on the base material 50, and the studs 51 are placed on the film 52. Then, while keeping this state, it is set in a mold (not shown) in which a coil of the electromagnetic induction heating device is incorporated, and a high frequency current is applied to the coil while pressing the stud 51 against the base material 50 to generate an alternating magnetic field. Let Then, the inside of the film 52 placed in this alternating magnetic field is heated by eddy current loss and hysteresis loss, and the resin that serves as the base material of the film 52 is melted by this heat, and this melting causes the base material 50 and the stud 51 to The spaces are glued together. After this, the clip 53 is attached to the stud 51.

[Problems to be Solved by the Invention] However, in the conventional method using electromagnetic induction heating shown in FIG. 7, since the film 52 is simply set between the base material 50 and the stud 51, the film 52 is not set after the setting. There are problems that it is misaligned and difficult to position, and the adhesive effect is not sufficiently obtained.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a stud fixing structure capable of improving workability and reliability.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is arranged on a base material of a resin stud with a magnetic body interposed therebetween, and uses a magnetic field generated by an electromagnetic induction heating device. In the stud fixing structure in which a part of the stud is heated and melted by heating the magnetic body, and the stud is fixed in a substantially upright state by being bonded and fixed to the base material, the magnetic body is provided with a plurality of small holes. Part of the stud melted by the electromagnetic induction heating device, which is formed by a plate-shaped member and is provided with a protrusion for positioning the magnetic body by engaging with the small hole on the lower end surface of the stud. Is bonded and fixed to the substrate through the small holes.

[Operation] According to this configuration, the projection on the stud side is engaged with the small hole of the magnetic body to position the magnetic body and the stud, and the stud is mounted on the base material with the magnetic body interposed therebetween. When directly placed and the magnetic material is placed in the magnetic field generated by the electromagnetic induction heating device, the part of the stud that is in contact with the magnetic material is heated and melted, and the melted part is a small hole in the magnetic material. The studs are fixed by gluing directly onto the substrate through.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

1 to 3 show a fixing structure of a stud to an interior part according to an embodiment of the present invention.

In the figure, this fixing structure is composed of a stud 2 to which the clip 1 is attached, a magnetic body 3, a base material 4, and the like.

More specifically, the base material 4 is a vehicle interior component such as a door trim. The stud 2 is attached to a predetermined position 4a (see FIG. 3) on the back surface and the skin material 5 is attached to the front surface side.

The magnetic body 3 is formed of a single ferromagnetic metal plate and has a plurality of small holes 6 penetrating the surface thereof.

The stud 2 is made of a resin material that can be heated and melted, as shown separately in FIGS. 5 and 6, and is a horizontal portion 2a that abuts the base material 4 via the magnetic body 3. And a vertical portion 2b that is erected upward from the center of the horizontal portion 2a are integrally formed. Further, a projection 7 engageable with the small hole 6 is provided on the lower end surface of the horizontal portion 2a. The projection amount of the projection 7 is formed to have a size substantially equal to the plate thickness of the magnetic body 3, and the outer diameter of the small hole 6 is such that the projection 7 is press-fitted into the small hole 6. It is formed slightly larger than.

Next, a procedure for attaching the stud 2 to the base material 4 will be described with reference to FIGS. 4 (a) and 4 (b).

First, before attaching the stud 2 to the predetermined position 4a of the base material 4, the magnetic body 3 is arranged on the lower end surface side of the horizontal portion 2a. Then, as shown in FIG. 3A, the projection 7 is inserted into the small hole 6, and the stud 2 and the magnetic body 3 are positioned and temporarily coupled to each other to integrate them. Further, in this integrated state, the stud 2 and the magnetic body 3 are arranged at a predetermined position 4a of the base material 4. Then, in this state, the coil of the electromagnetic induction heating device is set in a mold (not shown). After that, a high frequency current is applied to the coil of the electromagnetic induction heating device while pressing the stud 2 against the base material 4 to generate an alternating magnetic field. Then, the magnetic body 3 placed in the alternating magnetic field generates heat due to eddy current loss and hysteresis loss, and this heat causes a part 2A (including the protrusion 7) on the lower end surface side of the horizontal portion 2a and the base material 4 to be generated. A part of the back side is melted.

Then, as shown in FIG. 3B, the melted part of the horizontal portion 2a flows through the small holes 6 toward the base material 4 side and is bonded to the melted part of the base material 4. . That is, for the adhesion between the stud 2 and the magnetic body 3 and the adhesion between the magnetic body 3 and the base material 4,
The stud 2 and the base material 4 are directly bonded to each other to be securely bonded and fixed. After that, the clip 1 is attached to the vertical portion 2b of the stud 2, and the base material 4 is attached to the inner panel of the vehicle or the like via the clip 1 and the stud 2.

Therefore, according to this structure, when the magnetic body 3 and the stud 2 are arranged on the base material 4, the projection 7 on the stud 2 side is engaged with the small hole 6 of the magnetic body to allow the magnetic body 3 and the stud 2 to be engaged. Since and can be arranged in a pre-positioned state, the deviation during setting in the electromagnetic induction heating mold and during heating is reduced. This simplifies the work. Further, a part of the melted stud flows through the small holes 6 onto the base material 4 and is directly adhered to the base material 4. Therefore, this direct adhesive fixing and the adhesion between the stud 2 and the magnetic body 3 are performed. By the fixing and the adhesive fixing of the magnetic body 3 and the base material 4, reliable adhesion can be obtained.

Although the present invention has been described with reference to the above embodiment, it is needless to say that the invention is not limited to the structure of this embodiment, and various design changes may be made without departing from the gist of the present invention. . For example, in the above-described embodiment, the magnetic body 3 formed of a plate-shaped metal plate is used, but it is formed by providing a small hole 6 in a film formed by mixing ferromagnetic powder into a heat-meltable resin material. You may use what was done. Further, not only two protrusions 7 formed on the lower end surface of the horizontal portion 2a but also the number of the small holes 6 may be provided corresponding to the small holes 6.

[Advantage of the Invention] As described above, in the stud fixing structure according to the present invention, when the magnetic body and the stud are arranged on the base material, the magnetic body and the stud are arranged in a pre-positioned state. As a result, it is possible to reduce the deviation when setting in the electromagnetic induction heating device and during heating. As a result, the fixing work can be done easily and accurately to improve workability, and a part of the melted stud flows through the small holes onto the base material, and the stud is directly adhered and fixed to the base material. As a result, reliable fixing can be obtained and reliability can be improved.

[Brief description of drawings]

1 is a perspective view showing a fixing structure of a stud according to the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is the same as shown in FIG. 1 and FIG. 4A and 4B are exploded perspective views of the structure, FIG. 4A and FIG. 4B are cross-sectional views for explaining a fixing procedure of the structure shown in FIGS. 1 to 3, and FIG. FIG. 6 is a side view of a single stud used in the same structure as shown in the figure, FIG. 6 is a bottom view of the same stud as shown in FIG. 5, and FIG. 7 is a sectional view for explaining a conventional stud fixing structure. Is. 2 stud 3 magnetic material 4 base material 6 small hole 7 projection

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B29L 31:00

Claims (1)

[Scope of utility model registration request] 1. A magnetic material is interposed between the studs, and the magnetic material is heated by a magnetic field generated by an electromagnetic induction heating device to heat a part of the studs. In a fixed structure of a stud that is melted and is fixed to the base material by melting and is provided in a substantially upright state, the magnetic body is formed of a plate-shaped member having a plurality of small holes,
The lower end surface of the stud is provided with a protrusion for positioning and arranging the magnetic body by engaging with the small hole, and a part of the stud melted by the electromagnetic induction heating device is passed through the small hole to form the base material. A stud fixing structure characterized by being adhesively fixed to.