JPH01145131A - Fixing of fittings - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a component fixing method for inserting and fixing a mounting component such as a switch box into an object to be assembled such as a vehicle instrument panel having a foamed resin layer on the inner surface. Regarding.

(Prior Art) Conventionally, an assembly component is attached to an instrument panel by inserting the component into a mounting hole formed in the panel and fixing it with screws.

(Problem to be Solved by the Invention) In the above-mentioned method, since the mounting parts are only partially fixed to the instrument panel at the locations where they are screwed, squeaks and rattles are likely to occur due to vehicle body vibration. Furthermore, the manufacturing process of the instrument panel requires a panel molding process and a parts mounting process, which poses a problem in improving productivity.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a method that allows a mounting part to be fixed to an object to be assembled without looseness during the molding process of the object to be assembled.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for inserting and fixing a mounting part into an object to be assembled having a foamed resin layer on the inner surface, in which the foamed resin layer is foam-molded. , the attachment part is molded onto the foamed resin layer via a covering member that covers the attachment part.

(Function) During foam molding of the foamed resin layer, the mounting parts are tightened from the periphery via the covering member by the foaming pressure, and the mounting parts are tightened and fixed to the foamed resin layer without play.

In addition, the attachment part is protected from the resin by the covering member, so that no functional failure occurs due to the intrusion of the resin into the part, and the attachment part itself does not adhere to the foamed resin layer, making it possible to remove the attachment part.

(Embodiment) The drawings show an embodiment in which a switch box (2) such as an air conditioner switch, which is an attachment part, is attached to an instrument panel (1) for an automobile, which is an object to be assembled.

The instrument panel (1) is constructed by forming a primary foamed resin layer (lb) on the inner surface of the skin (1a). After trimming the parts mounting holes (1c), etc., the inside of the panel material is It is obtained by overlapping the primary foamed resin layer (1b) to form a secondary foamed resin layer (1d), and when molding this secondary foamed resin layer (1d), a switch box (2
) was installed.

This will be explained in detail below. After the switch box (2) is covered with a bag-shaped covering member (3) made of a relatively flexible material such as polyethylene or polypropylene as shown in Figure 3, the panel material is Insert into the component mounting hole (IC) and attach a ring-shaped bracket (4) surrounding the switch box (2) to the inner surface of the material.
The panel material is set by passing over the locking protrusion (2a) formed on the circumferential surface of the panel, and then the panel material is inserted and set into the die (5) of the mold as shown in the second figure, and the upper punch (6) is set.
A cap (7') that fits into the connector part (2b) at the tail end of the switch box (2) on the set plate (6a) on the bottom of the switch box (2)
and the flexible printed circuit board (8) are set and the mold is clamped.

According to this, the substrate (8) is sandwiched between the cap (7) and the connector part (2b) and electrically connected thereto, and in this state, a foamed resin liquid such as urethane resin is applied to the panel material. The liquid is injected, foamed and solidified, and a secondary foamed resin layer (
1d) is molded.

At this time, the switch box (2) is tightened over substantially the entire surface of the switch box (2) via the covering member (3) by the foaming pressure of the resin, and the switch box (2) is molded onto the resin layer (1d) without play.

In addition, in the illustrated example, in order to prevent resin from entering the contact area between the printed circuit board (8) and the connector part (2b), there is a print on the periphery of the opening at the tail end of the covering member (3) from which the connector part (2b) protrudes. A bulge (3a) was formed that tightly adhered to the substrate (8).

By the way, the covering member (3) covering the switch box (2) is adhered to the secondary foamed resin layer (1d) and cannot be removed from now on.
) itself is not adhered to the resin layer (1d), so the switch box (2) can be removed by pulling it toward you without impairing maintainability.

Further, in the above embodiment, the covering member (3) is formed into a bag shape into which the switch box (2), which is the mounting part, can be inserted, but the present invention is not limited to this. For example, a heat shrinkable film may be used as the covering member, and this It is also possible to cover the mounting parts by heating the mounting parts, and further, as shown in FIG. The part that will become the member (3) is integrally molded, and the switch box (2) is inserted into it, and secondary foam molding is performed, and the primary foam resin layer (1b) is formed by foaming pressure.
) and the skin (1a), the switch box (2) may be tightened and fixed.

Furthermore, the present invention can also be applied to attachment parts other than the switch box (2), such as attachment of air conditioning air outlets.

(Effects of the Invention) As described above, according to the present invention, the mounting parts are molded into the foamed resin layer formed in the object to be assembled without play, and the generation of squeaks and rattles due to vibration can be prevented, and the mounting parts can be molded without play. is protected from foamed resin by the covering member that covers it, and it is also possible to remove the mounting part by pulling it out from the covering member, without compromising maintainability, and it can be mounted during the molding process of the assembled object. Since the parts can be fixed, the number of man-hours can be reduced compared to the case where parts are screwed together in a subsequent process, which has the effect of improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an example of a product obtained by the method of the present invention, Fig. 2 is a cross-sectional view showing the secondary foaming process of molding the winter fitting part, and Fig. 3 is a cross-sectional view of the fitting part and the covering member. The perspective view and FIG. 4 are cross-sectional views showing the secondary foam molding process of another embodiment. (1)...Instrument panel (object to be assembled) (1
d)...Secondary foamed resin layer (component mold resin layer) (2
)... Switch box (mounted parts) (3)... 2 people outside the covering member - Figure 1 Figure 3

Claims (1)

[Claims] In a method of inserting and fixing a mounting part into an object to be assembled having a foamed resin layer on the inner surface, when foaming the foamed resin layer,
A method for fixing parts, characterized in that the mounting part is molded onto the foamed resin layer through a covering member that covers the mounting part.