JPH06206504A - Bracket fixing formation method for automobile trimming material - Google Patents

Abstract

PURPOSE:To decrease the number of manufacturing processes and reduce cost by providing a forming method by which a fitting bracket is fixed simultaneously with the forming of an automobile trimming material, in the case of the automobile trimming material which is formed into a desired shape by softening a sheetlike original material consisting of thermoplastic resin by means of heating, and pressing it between male and female dies. CONSTITUTION:When the cold forming of automobile trimming material of a desired shape is conducted by softening a sheetlike original material 8 consisting of thermoplastic resin by means of heating and then pressing it between male and female dies 9, 10, a bracket 1 at whose seat plate portion 2 through-holes 5are formed and whose seat plate portion 2 front surface through-holes 5 have hollow portions 6 formed around them, is arranged beforehand at the required position of the male an female dies 9, 10 so that the front surface of the seat plate portion 2 may confront die faces, and it is arranged that softened thermoplastic resin passes into the through-holes 5 and projects into the hollow portions 6 and bulges and hardens.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior material in which a sheet material made of a thermoplastic resin is softened by heating and pressed into a desired shape by pressing it between male and female molds. The present invention relates to a molding method for fixing a mounting bracket.

[0002]

2. Description of the Related Art When molding a thin plate-like automobile interior material such as a deck side molding trim, for example, it is conventionally made of a thermoplastic resin obtained by mixing reinforcing glass fiber or synthetic fiber, wood powder, etc. in polypropylene. The sheet material is softened by heating it to about 180 ° C., and if necessary, a skin material is overlaid and sandwiched between male and female molds such as a press mold to perform cold compression molding to form a desired uneven shape. Is being done.

[0003]

However, in the above-mentioned molding method for automobile interior materials, since the thermoplastic resin does not have sufficient fluidity as seen in the injection molding method, various methods are conventionally used at the same time as molding. Such parts cannot be subjected to so-called insert molding, and therefore, after molding, they have been welded by an ultrasonic welder, adhered by an adhesive, or fixed by burring caulking such as sheet metal.

However, such post-installation has a problem in that the cost of a tool for bonding, the cost of materials or labor is increased and the number of required steps is increased, so that the manufacturing cost is increased.

[0005]

SUMMARY OF THE INVENTION The method for fixing a bracket of an automobile interior material according to the present invention is intended to solve the above-mentioned problems. It is a method for softening a sheet material made of a thermoplastic resin by heating and When cold-molding an automobile interior material of a desired shape by pressing between male and female molds such as a press mold, a through hole is formed in the seat plate portion and a recess is formed around the through hole on the front surface of the seat plate portion. The bracket is arranged in advance in a required position of the male and female molds so that the front surface of the seat plate portion faces the mold surface, and the softened thermoplastic resin passes through the through hole and projects into the recessed portion. It is characterized by being made to cure.

[0006]

The softened thermoplastic resin passes through the through hole of the bracket and protrudes into the recess to swell and harden to form the shape of a rivet head, and the bracket is firmly fixed simultaneously with molding.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.
The automobile interior material of this embodiment relates to a deck side molding trim as shown in FIG. 4, the surface of which is laminated with a fabric as a skin material, and the bracket 1 is integrally fixed at several points on the back surface simultaneously with the molding. To be done.

The bracket 1 shown in FIGS. 2 and 3 is made of a synthetic resin, and a pocket-shaped engaging portion 3 is integrally formed at the center of the front surface of a substantially rectangular plate-like seating plate portion 2, and the engaging portion 3 is hooked. The engagement hole 4 is formed, and a clip (not shown) can be engaged with the engagement hole 4. The seat plate 2 has a diameter of 7
A round through hole 5 of about millimeter is formed, and an annular recess 6 having a depth of about 2 mm is formed around the through hole 5 on the front surface of the seat plate portion 2. Further, as shown in FIG. 3, an annular protrusion 7 having a height of about 1 mm is formed around the through hole 5 on the back surface of the seat plate portion 2.

In the present invention, however, the sheet material 8 made of a thermoplastic resin such as polypropylene mixed with reinforcing glass fiber, synthetic fiber, wood powder, etc. is softened by heating it to about 180 ° C. with a heater. Then, the sheet-shaped raw fabric 8 is arranged between the male and female molds 9 and 10 as shown in FIG. 1A, the skin material 12 is arranged on the sheet-shaped raw fabric 8, and the bracket 1 Is arranged in advance so that the front surface of the seat plate portion 2 faces the mold surface of the lower male and female mold 9, and FIG.
As shown in (b), the upper male / female mold 10 is lowered to move the sheet material 8 between the male / female molds 9 and 10 to form the skin material 1.
The sheet-shaped raw fabric 8 is cold-molded together with 2 and cold-molded into a molding trim 11 having a required uneven shape, and a skin material 12 is attached to the molding trim 11.

At this time, the moderately softened thermoplastic resin passes through the through hole 5 of the bracket 1 by pressure and projects into the recess 6 to fill the recess 6 and harden. Therefore, the recess 6
The hardened thermoplastic resin functions just like the head of a rivet, and as shown in FIGS. 5 and 6, the bracket 1 can be securely fixed to the back surface of the molding trim 11.

A projection 7 is formed on the back surface of the seat plate portion 2 so that the projection 7 presses the sheet-shaped raw fabric 8 only strongly at this portion when the male and female dies 9, 10 are pressure-bonded. Therefore, the pressure in this portion becomes high, and the softened resin flows into the recess 6 more smoothly.

In another embodiment of the present invention shown in FIG. 7, instead of the protrusion 7 of the bracket 1, a shallow circular protrusion 13 is formed on the mold surface of the male / female mold 10, and the circular protrusion 13 crimps. Sometimes this resin part is made more pressurized,
Even if the protrusion is formed on the mold surface in this way, the same pressing action as that of the protrusion 7 can be obtained.

In this manner, since the bracket 1 is integrally fixed to the rear surface of the molded trim 11 at the same time as the molding, the known clip is simply fitted into the engaging hole 4 of the bracket 1 so as to be easily attached to the inner surface of the sheet metal of the automobile. become able to.

In the above embodiment, the skin material 12 is attached at the same time as molding, but the skin material 12 may be formed by adhering various materials selected according to need, and may be omitted. It is also possible to use the one already attached to the sheet-shaped raw fabric 8.

[0015]

As described above, according to the method for fixing and molding a bracket for an automobile interior material of the present invention, the bracket can be firmly fixed at the same time as the molding. Since the number of steps can be reduced without the need for manufacturing, there is a beneficial effect that the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a male and female mold showing steps of a method for fixing a bracket to an automobile interior material according to the present invention.

FIG. 2 is a front perspective view of a bracket.

FIG. 3 is a rear perspective view of the bracket.

FIG. 4 is a rear perspective view showing an example of an automobile interior material.

5 is a partially enlarged perspective view of FIG.

6 is a vertical cross-sectional view of FIG.

FIG. 7 is a vertical cross-sectional view of a male and female mold showing another embodiment of a method for fixing and fixing a bracket of an automobile interior material.

[Explanation of symbols]

 1 bracket 2 seat plate 5 through hole 6 recess 8 sheet-shaped original fabric 9,10 male / female type

Claims (1)

[Claims] 1. A seat plate portion when a sheet-shaped raw sheet made of a thermoplastic resin is softened by heating and then pressure-bonded between male and female dies such as a press die to cold-form an automobile interior material having a desired shape. A bracket having a through hole formed therein and a recess formed around the through hole on the front surface of the seat plate portion is previously arranged at a required position of the male and female molds so that the front surface of the seat plate portion faces the mold surface. Then, the softened thermoplastic resin passes through the through hole and protrudes into the recess so as to swell and harden.