JPH0360300B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Field of the Invention>> The present invention relates to a method for manufacturing interior parts for automobiles, which makes it possible to easily produce interior parts such as automobile door trims with excellent decorative properties.

≪Prior art and its problems≫ For example, interior parts such as automobile door trims, etc.
Generally, the core material is formed to approximately match the shape of the vehicle body panel, and the surface of the core material is covered with a skin material via a pad material such as urethane foam.

Recently, for example, as shown in Japanese Utility Model Application Publication No. 61-34437, by painting a single skin material, the appearance of parts such as colors and patterns can be made different, thereby improving the appearance design of the product. Attempts have been made to achieve this, and attempts have been made to attach decorative members made of different materials at appropriate positions on the surface of the skin material. For example, using PVC sheets as the skin material, attaching intermediate members such as cloth material, carpets, etc. to appropriate positions. It has been proposed to improve the design quality by, for example,

However, when a single surface material is painted, there are problems such as the surface texture and feel of the painted surface being impaired, and due to variations in paint particles, etc., the boundaries of the paint are not clearly formed. , it was not pleasing in terms of appearance either.

On the other hand, the type in which decorative members are attached at appropriate positions on the surface of the skin material in a later process increases the number of man-hours required, leading to increased costs, and also impairs the sense of unity between the skin material and the decorative members, making it difficult to design. I couldn't say it improved much.

≪Object of the Invention≫ The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a simple and inexpensive manufacturing method for automobile interior parts using skin materials made of different materials. To provide a method for manufacturing an interior part for an automobile, which can be manufactured in a number of ways, can clearly form a parting line that is a boundary between different materials, and can significantly improve the appearance of the product.

<<Structure and Effects of the Invention>> In order to achieve the above object, the present invention comprises a core material formed into a desired shape, and a material made of dissimilar materials adhered to the surface of the core material and joined with a parting line as a boundary. In the method of manufacturing an automobile interior part made of a skin material made of A process of plotting a parting line at the time of development and setting the parting line at the time of development in advance on the skin material, sewing different materials together with the parting line at the time of development as a border, and making a non-ventilated part in this sewn part. forming a skin material in such a way that the skin material is soft and flexible; heating and softening the skin material, and inserting the sewn portion of the skin material into the recessed groove along the parting line of the preformed core material; The method is characterized by comprising a step of integrally adhering the skin material to the surface of the core material by vacuum forming after the insertion.

That is, according to the above configuration, the parting line provided on the skin material formed in a three-dimensional shape along the shape of the core material is used as the parting line at the time of development,
First, it is plotted and the parting line for development is set in advance on the skin material in sheet form before molding, so if different materials are sewn together using the parting line at the time of development as a boundary, this can be done. By attaching and integrating the sewn skin material onto the surface of the core material by vacuum forming, this kind of skin material can be easily and inexpensively integrated with the surface of the core material, which greatly simplifies workability and greatly improves productivity. This has the advantage of bringing about significant cost reductions.

Furthermore, because different materials are sewn together in advance with the parting line at the time of development on the skin material as a boundary, the parting line as a boundary line of the surface appearance is less effective than the painting method using a masking jig. It takes advantage of the linearity and can create a sense of unity between dissimilar materials compared to those in which decorative members are attached to the skin material in a separate process, making it possible to provide products with excellent decorative properties.

<<Description of Examples>> Hereinafter, the manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing an automobile door trim to which the manufacturing method according to the present invention is applied, and FIGS. 2 to 8 are explanatory views showing the manufacturing process of the automobile door trim.

In Fig. 1, this automobile door trim 1
It is generally composed of a core material 2 that is molded to approximately match the shape of the vehicle body panel, and a skin material 3 that is adhered to the surface of the core material 2.

More specifically, this core material 2 is made by mixing and stirring a polypropylene resin and a wood flour filler at an appropriate mixing ratio, extruding it into a sheet using a T-die extrusion molding machine, heating and softening the sheet, and then forming it into the desired shape. It is molded into a three-dimensional shape with surface irregularities using a cold press mold, and grooves 5 are formed along parting lines 4.

The skin material 3 is integrally attached to the surface of the core material 2 by vacuum forming, and the upper part 6 of the skin material 3 is lined with a foam layer 8 on the back surface of the PVC sheet 7, with the parting line 4 as the boundary. The foam layer 8 is formed by mixing a foaming agent into a resin material blended at a ratio of polypropylene resin: polyethylene resin: 60:40, and foam-molding the mixture at a magnification of about 25 times.

On the other hand, the lower part 9 of the parting line 4 has a PVC sheet 11 backed on the back side of the cloth material 10, and the materials used for the upper part 6 and the lower part 9 are both non-porous and can be vacuum formed. It is.

Next, a method for manufacturing the above automobile door trim 1 will be explained based on FIGS. 2 to 8.

The method of the present invention is roughly divided into the following steps.

(1) The process of setting a parting line on the skin material when it is developed.

(2) A process in which different materials are sewn along the parting line when unfolded to form the skin material.

(3) The process of attaching and integrating the sewn skin material to the core material.

(1) The process of setting a parting line on the skin material when it is developed.

First, as shown in FIG. 2, using a model 12 of the material used for the top part 6 of the skin material 3, that is, a material in which the back surface of the PVC sheet 7 is lined with a foam layer 8, grid lines 13 are formed at 10 mm intervals. do.

After heating and softening this model 12,
It is integrally attached to the surface of the core material 2 that has been preformed into a desired shape, and a predetermined parting line 4 is drawn on the surface of the skin material model 12 (see FIG. 3).

Next, the parting line 4 drawn in the three-dimensional shape shown in FIG. 3 is used as the parting line 14 at the time of development on the skin material model 12 in a sheet state before molding.
Make a plot (see Figure 4).

At this time, since the skin material model 12 has grid lines 13 set at 10 mm intervals vertically and horizontally,
The degree of elongation of each part can be accurately grasped, and it can be easily converted into the parting line 14 at the time of expansion.

(2) Sewing process of skin material.

Next, as shown in FIG. 5, the top part 6 of the skin material 3 is
Then, the lower part 9 is sewn to join them together. Then, as shown in FIG. 6, an adhesive tape 16 is applied to the front side along the sewing line 15.
(Product No. DF-2700, manufactured by Toyo Ink Co., Ltd.) is applied, and the sewing line 15 is subjected to non-breathable treatment. In this way, a vacuum-formable skin material 3 is formed which is non-air permeable as a whole.

(3) Integration process of adhering the skin material and core material.

In FIG. 7, a preformed core material 2 is placed on the mold surface of a vacuum forming mold 17, and an adhesive 18 is applied to the surface side of the core material 2.

Furthermore, above it, the skin material 3 that has been sewn in the above process is heated and softened, and its outer peripheral edge is held by a clamp tool 19.

Then, the skin material 3 is positioned with its sewn portion 15' on the lower side, and after this sewn portion 15' is fitted into the groove portion 5 of the core material 2 and set, the vacuum forming mold is moved by driving an elevating means (not shown). As the mold 17 rises, the core material 2 and the skin material 3 come into close contact with each other, and the air between them flows through the vacuum holes 2a formed in the core material 2 and the vacuum forming mold 17, as shown in FIG. is removed to the outside by a vacuum suction means (not shown) through the vacuum suction hole 17a, and the skin material 3 is faithfully adhered along the surface of the core material 2.
Both are integrated.

Thereafter, the integrated semi-finished product is taken out of the vacuum forming mold 17, the adhesive tape 16 pasted along the sewing line 15 is peeled off, and the peripheral end 3a of the skin material 3 is placed on the back side of the core material 2. If it is rolled up and fixed, the automobile door trim 1 shown in Fig. 1 will be created.
The assembly is completed.

Although the adhesive tape 16 was used in the above-mentioned embodiment, an adhesive with excellent sealing properties, such as product number It may also be made to impart non-air permeability.

As described above, in the method of the present invention, if the skin material is formed by sewing different materials in advance along the parting line at the time of development, the process of attaching the skin material and the core material is simple. It is possible to manufacture interior parts such as automobile door trims, which significantly improves work efficiency.
In addition to achieving significant cost reductions, the parting lines are made by sewing dissimilar materials together in advance as described above, so they look better than painting methods, and compared to methods that attach decorative members to the surface of the skin material. , a sense of unity can be achieved between different materials, and the external design is significantly improved.

[Brief explanation of drawings]

Fig. 1 shows an example in which the method of the present invention is applied to an automobile door trim, and is a partially cutaway perspective view of the door trim, and Figs. 2 to 8 are explanatory diagrams showing the manufacturing process of the automobile door trim. . 1... Automobile door trim, 2... Core material, 3...
...Skin material, 4...Parting line, 5...Groove, 6
...Atsupa part, 9...Lower part, 12...Model,
13... Grid line, 14... Parting line when unfolding, 15... Sewing line, 16... Adhesive tape.

Claims (1)

[Claims] 1. An interior part for an automobile that includes a core material molded into a desired shape and a skin material made of different materials that is adhered to the surface of the core material and joined with a parting line as a boundary. In the manufacturing method, a predetermined parting line to be formed on the skin material adhered and molded on the surface of the core material is plotted on the skin material in a sheet state as a parting line at the time of development before molding, A step of setting a parting line at the time of unfolding in advance, and a step of sewing dissimilar materials together with the parting line at the time of unfolding as a border, and forming a skin material by providing impermeability to the sewn part. After softening the skin material by heating and inserting the sewn portion of the skin material into the recessed groove of the preformed core material along the parting line, the skin material is vacuum-formed. 1. A method for producing an automobile interior part, comprising: a step of integrally adhering the material to the surface of a core material.