JPH02274640A - Method of adhesively mounting bracket to plate-shaped resin member for automobile interior decoration - Google Patents

Abstract

PURPOSE:To efficiency perform adhesive mounting of brackets without deformation and damage or the like to a plate-shaped resin member by opposedly arranging thereto a bracket in its fold piece part through a thermo-plastic or thermo-setting adhesive agent and energizing a high frequency induction heating coil correspondingly arranged in the fold piece part. CONSTITUTION:A trim 1 is moved from the upper of a resin mold 11 to its lower, and the trim 1, when it is mounted onto an adhesive agent 12, is placed on the resin mold 11 through the adhesive agent 12 and fold piece parts 7, 8 and arranged in a right position with a space l from the resin mold 11. Next by lightly pressurizing the trim 1 toward the resin mold 11 while supplying a high frequency current from a high frequency power supply 15 energizing a coil 9, a fiber-shaped ferromagnetic material in the adhesive agent 12 is heated by induction heating action thus heating the thermo-plastic adhesive agent 12. Next stopping the electrification of the coil 9, when the resin mold 11 is separated from the trim 1 and naturally cooled, a substrate part 2 of the trim 1 and the fold piece parts 7, 8 of a bracket 4 are firmly connected to the adhesive agent 12 to each other, and two or more brackets 5 can be simultane ously mounted to two or more predetermined parts of the trim 1.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention provides a crank-shaped bracket consisting of a main body portion having a cross-sectional shape and a pair of bent pieces provided on both sides of the main body portion, for use in automobile interiors. The present invention relates to a method of adhering to a plate-shaped resin member for use.

b. Prior Art A thin sheet-shaped resin trim is usually attached to the inner surface of an automobile door to decorate the interior of the vehicle.

The trim is attached by first fitting a clip protruding from the inner panel of the door into a hole in a bracket bonded to the trim.

By the way, as a method of gluing the bracket to the trim,
Conventionally, a method has been adopted in which a part of the synthetic resin bracket is melted by heat generated by ultrasonic vibration and welded to the trim, or a method is used in which a rivet is used to fix these two members to each other.

Recently, as shown in FIGS. 8 and 9, a film-like adhesive 20 made of a thermoplastic resin mixed with ferromagnetic powder has been applied to bent pieces 21a and 21b of a crank-shaped bracket 21. and the trim 22, and under this condition, the multi-turn high frequency induction heating coil 2
3 on the side opposite to the bracket 21, that is, on the side of the trim 22, and by energizing this coil 23, the adhesive 2
A method has been proposed in which the bracket 21 is adhesively fixed to the rim 22 by heating the bracket 21 by induction.

C9 Problems to be Solved by the Invention However, in the case of the bonding method using ultrasonic vibration,
Since the bent pieces 21a and 21b of the bracket 21 are welded under strong pressure by applying a horn to them, it is possible to weld them to the decorative material (for example, polyvinyl chloride or carpet) on the interior side of the vehicle that makes up the trim 22. The pressure causes deformation and dents, and even after the pressure is removed, these four parts do not elastically return to their original states and remain, resulting in an inconvenience that spoils the appearance.

In addition, in the case of the bonding method using high-frequency induction heating as described above, the multi-turn high-frequency induction heating coil 23
Since the high-frequency induction heating coil 23 is arranged corresponding to the trim 22 from the side where the bracket 21 is not disposed and the adhesive 20 is heated by induction, the coil 23 and the adhesive 20 are heated by induction. Since the trim 22 (thick plate: about 5 to 10IIIN1) is interposed between the two, the distance between them inevitably becomes long, and there is a big problem that the heating efficiency is extremely poor.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to bond brackets extremely efficiently and reliably without causing deformation or damage to the plate-shaped resin member to which the brackets are attached. The purpose is to provide a method that can be done in a short amount of time.

61 Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention provides a crank-shaped bracket consisting of a main body portion having a U-shaped cross section and a pair of bent pieces provided on both sides of the main body portion. In the method of adhering a bent piece of the bracket to a plate-shaped resin member for automobile interior, the main body of the bracket is placed in a state where the bent piece of the bracket is placed opposite to the resin member via a thermoplastic or thermosetting adhesive. A high-frequency induction heating coil that is wound so as to surround the bracket is placed in correspondence with the bent piece from the side of the bracket, and electricity is applied to the high-frequency induction heating coil to inductively heat the adhesive and fix the bracket. He is trying to adhere to the resin member.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 shows a trim l for automobile decoration,
This trim 1 is designed to be attached to an inner panel (not shown) on the inside of the vehicle's side door. For example, as shown in FIG. 2, this trim 1 includes a polypropylene substrate 2, a foamed polypropylene temporary 3 laminated on this substrate 2, and a polypropylene foamed polypropylene plate 3 laminated on the foamed polypropylene plate 3. It consists of a vinyl chloride sheet 4 (or carpet), and a plurality of trim mounting brackets 5 are attached to the base plate 2. The above-mentioned bracket 5, as shown in FIGS. 3 and 4,
It is made by bending and forming a single rectangular plate into a crank shape, and includes a main body part 6 having a U-shaped cross section with a clip engagement hole 5a on the upper surface, and a pair of parts provided on both sides of the main body part 6. The bent piece portions 7 and 8 are respectively provided.

In order to attach the bracket 5 to the trim 1, a resin mold 11 formed by embedding a high frequency induction heating coil 9 as shown in FIG. 5 in a synthetic resin material IO as shown in FIG. 6, and a fibrous metal material are used. A thermoplastic film-like adhesive 12 containing a ferromagnetic material (ferromagnetic material) is prepared.

Note that the high-frequency induction heating coil 9 used in this example has multiple spirally wound portions 13 so as to surround the main body portion 6 of the bracket 5, as clearly shown in FIG. Each winding portion 13 is arranged so as to correspond to the main body portion 6 of each bracket 5, as will be described later. Further, each winding portion 13 is connected in series via a connecting portion 14, and a high frequency current is supplied to the coil 9 from a high frequency power source 15. On the other hand, as shown in FIG. 6, the resin mold 11 is provided with a plurality of recesses 16 and 17 corresponding to the main body part 6 and the bent piece parts 7 and 8 of the bracket 5, respectively. Edge 1
A winding portion 13 of a high frequency induction heating coil 9 is embedded in the coil 8 .

Next, to describe the procedure for attaching the bracket 5 to the trim l, first, the bracket 5 is fitted into each of the recesses 16 and 17 of the resin mold 11, and the bent pieces 7 and 8 of the bracket 5 are Adhesive 12 is temporarily attached to.

Alternatively, the bracket 5 formed by two-color molding (integral molding) with the adhesive 12 on the bending piece 7.8 is placed in each recess 1 of the resin mold 11.
6.1? They are fitted and placed inside each other. Thereafter, the trim 1 is moved from above to below the resin mold 11 and placed on the adhesive 12. As a result, the trim 1 is placed on the resin mold 11 via the adhesive 12 and the bent pieces 7 and 8, and is placed at a position with a slight distance 1 from the resin mold 11. On the other hand, the winding part 13 of the high-frequency induction heating coil 9 in the resin mold 11 is arranged correspondingly to the adhesive 12 via the bent piece part 7.8 of the bracket 4.

Under such conditions, when the trim 1 is lightly pressurized toward the resin mold 11 and a high frequency current is supplied from the high frequency power supply 15 to the coil 9 to energize it, the fibers mixed in the adhesive 12 are removed. The ferromagnetic material generates heat due to induction heating, and the thermoplastic adhesive I2 is accordingly heated. Next, when the coil 9 is de-energized and the resin mold 11 is separated from the trim l and allowed to cool naturally, the base plate 2 of the trim l and the bent pieces 7 and 8 of the bracket 4 are bonded to the adhesive 12.
The brackets 5 are fixed to the trim 1 with adhesive. Thus, a plurality of brackets 5 are simultaneously attached to a plurality of predetermined locations on the trim l.

In this way, the trim 1 to which the plurality of brackets 5 are attached is inserted into the engagement hole 5a of the bracket 5 by a clip (not shown) protruding from the inner panel of the side door of the automobile.
It can be attached to the inner panel of the side door as a decorative part by attaching it to the inner panel of the side door.

Here, to describe a specific example, an adhesive 12 with a thickness of 0.7 mm is used, which is made by mixing a stainless steel fibrous metal material into a polypropylene resin as a heating element, and
Eight brackets 5 made of ABS resin having the shape shown in the figure are prepared, and the eight brackets 5 are simultaneously induction-heated using a high-frequency induction heating coil 9 on the trim 1 having the configuration shown in FIG. Frequency 2.OMHz.

When the heating time was 3.5 seconds), the peel strength of each bracket 5 against the trim 1 was 50 kg or more.

By the way, the number of brackets 5 glued to one piece of trim 1 varies depending on the car model and the type of front door, rear door, etc., but since it is approximately 6 to 12, the total inductance of the high frequency induction heating coil 9 is inevitably large. (This will result in poor matching, so it is desirable to use a coil with small inductance.

According to this example, since a bonding method using high frequency induction is adopted instead of the conventional bonding method using ultrasonic waves, bonding can be performed without applying excessive pressure, and trim l
There is no risk of dents etc.

Moreover, since the high-frequency induction heating coil 9 is placed on the side of the bracket 5, the distance between the coil 9 and the adhesive 12 can be narrowed, and therefore the adhesive 12 can be efficiently induction heated. . To describe a specific experimental example, the output of the high frequency power source 15 was set to 5 kW, using the trim 1 and bracket 5 made of the same materials as in the previously described specific example.
The frequency is 2.0MFIz, and the high frequency induction heating coil 9
When induction heating is performed by placing the high-frequency induction heating coil 9 on the opposite side of the bracket 50 (on the side of the trim 1), the time required to reach the required heating temperature is 6.0 seconds, whereas the high-frequency induction heating coil 9 When induction heating is performed by placing the on the bracket 5 side, the time required to reach the required heating temperature is 3.0
It has been confirmed that induction heating from the bracket 5 side takes only 10% of the time.

Furthermore, since the adhesive 12 is mixed with a fibrous ferromagnetic material that has higher heat generation efficiency than powdered ferromagnetic material, it is possible to further improve heating efficiency and shorten the heating time. be able to. To describe a specific experimental example, adhesive 19 and SUS-based fibrous material were mixed.
Adhesive 19' (thickness 0, 8
An, width IQtm, length 100mm) was induction heated (input 1, 5kW, frequency 4.OMHz) using a high-frequency induction heating coil 9' as shown in Fig. 7. The time was 1.8 seconds for Adhesive 19 and 4.5 seconds for Adhesive 19', confirming that Adhesive 19 took only a short time of l/2.5. .

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, the number of turns of the winding portion 13 of the high-frequency induction heating coil 9 can be changed depending on the length of the bent pieces 7 and 8 of the bracket 5, and as the length becomes longer, the number of turns can be increased accordingly. do it. Further, the adhesive 12 is not limited to thermoplastic adhesive, and a thermosetting adhesive may be used.

Furthermore, the bonding method according to the present invention is applicable not only to the trim 1 for a side door of an automobile, but also to attaching a bracket to other plate-shaped resin members for automobile interiors, such as a resin instrument panel. Needless to say.

e2 Effects of the Invention As described above, the present invention is configured to bond a bracket to a plate-shaped resin member for automobile decoration by applying high-frequency induction heating from the side of the bracket. This method does not cause deformation or damage such as dents to the resin member, and the high-frequency induction heating coil can be placed closer to the adhesive than when high-frequency induction heating is performed from the resin member side. Brackets can be bonded efficiently in a short time.

[Brief explanation of drawings]

Figures 1 to 7 are for explaining one embodiment of the present invention, in which Figure 1 is a rear view of an automobile trim, Figure 2 is a sectional view of the trim, and Figure 3 is a bracket view. Floor plan, 4th
The figure is a perspective view of the bracket, Figure 5 is a plan view of the high-frequency induction heating coil arranged corresponding to the bracket, Figure 6 is a cross-sectional view showing the method of bonding the bracket to the trim, and Figure 7 is the adhesive applied to the high-frequency induction heating coil. A cross-sectional view showing induction heating with a heating coil, Figure 8 is a cross-sectional view showing a conventional bonding method in which induction heating is performed from the trim side, and Figure 9 is an enlarged view of the ■-■ line in Figure 8. A large cross-sectional view of the line. ■・・・Trim as a plate-shaped resin member for automobile decoration, 5
... Bracket, 6... Main body. 7.8...Bending piece portion, 9...High frequency induction heating coil, 12...Thermoplastic film adhesive, 13
... Winding section. Figure 5 Figure 2 Figure 6

Claims (1)

[Claims] In a method for bonding a crank-shaped bracket consisting of a main body having a U-shaped cross section and a pair of bent pieces provided on both sides of the main body to a plate-shaped resin member for automobile interior, the bent pieces of the bracket are A high frequency induction heating coil wound so as to surround the main body of the bracket is bent from the side of the bracket while being placed opposite to the resin member via a thermoplastic or thermosetting adhesive. A plate-shaped resin member for an automobile interior, characterized in that the bracket is bonded to the resin member by inductively heating the adhesive by energizing the high-frequency induction heating coils arranged in correspondence with one part. How to attach the bracket to.