JP3025857B2 - Automotive interior part having hollow part and manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a decorated portion articles having such grip shape of the grip to be mounted automotive interior parts, particularly vehicle door having a hollow portion.

[0002]

2. Description of the Related Art In recent years, a grip 10 as shown in FIG. 6 has been employed as an accessory for a door of an automobile or the like for operability at opening and closing and stabilization at the time of boarding. It is formed by injection molding a resin single material or a resin or metal core with a vinyl chloride resin and coating and integrating the same.

[0003]

However, such a grip requires a combination of a plurality of parts from the viewpoint of structure and feel, and in particular, in the case of integral coating by injection molding, either the skin material or the core material depends on the outer shape. It is necessary to respond to molding with the input amount of material, it is unavoidable to use more material than necessary, and it has difficulties in both weight and cost, and in some cases, to improve surface quality, The need to apply a paint may occur. In addition, in the case of injection molding, incomplete bonding may occur due to displacement between the skin and the core body, and peeling and falling off of the skin may occur.

[0004] The present invention addresses the above-described situation, and focuses on the holding and fixing by fitting and fitting of the skin and the injection mold to prevent the skin from falling off and slipping, and to form a core in the hollow skin. An object of the present invention is to provide an interior part having a soft grip feeling and a lightweight grip shape by injection and hollowing.

[0005]

SUMMARY OF THE INVENTION In order to meet the above-mentioned object, the present invention provides a method for manufacturing an automobile interior part in advance.
Protrusions or grooves are provided on a part of the outer surface of the hollow skin to be formed
With the core mold of the injection mold, or
After holding the mold with the mold and tightening the mold, gas injection
The resin for the core body is injected into the hollow skin by the
The hollow core was integrally molded.

[0006]

[0007]

According to the interior parts and the manufacturing method of the present invention, the hollow body skin is formed in advance, and the hollow body skin is clamped to the core mold of the injection molding die for forming the core body by fitting the concave and convex or by the slide structure of the mold. Later, resin for the core body is injected into the hollow skin inside the mold, and gas is injected to hollow the core body to create interior parts. Moreover, since the resin for the core is injected into the skin, no parting line is formed on the surface of the skin, and even if the adhesiveness with the core is incomplete due to the hollow body skin, peeling,
General imperfections such as falling off do not occur, and it is possible to form an interior part having a light weight, a soft feeling and a good appearance as a whole.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the structure of a grip 10 as an example of an automobile interior part according to the method of the present invention. In FIG. 1, 1 is a hollow skin, 5 is a hollow core having a hollow portion 7 inside, , 5 have an integrated configuration.
The hollow skin 1 is provided with a projection 2 which is a feature of the present invention.

[0010] Figure 2 is integrally molded with the core body 5 in the present invention shows an example of a hollow epidermis definitive to the present invention method, the hollow skin 1 is generally slush molding, rotational molding, also depending on the shape by blow molding or the like Molded prior to

Since the hollow skin 1 has an average thickness of about 2.5 mm by the slush molding and the rotational molding, a soft feeling of a surface hardness of about 80 to 85 ° (Shore hardness) can be obtained.

Here, as the skin material of the hollow skin 1, a thermoplastic elastic material, for example, a vinyl chloride resin, a polyolefin resin, a urethane resin or the like is used, and a material having a soft feeling is particularly preferable.

Then, the molded hollow skin 1 is set in an injection mold M as shown in FIGS. 3 and 4, and the hollow core resin is injected into the hollow portion 4 of the skin and integrated to form the above-mentioned structure. shaping the interior part with such a present invention.

Therefore, the hollow skin 1 is placed in the injection mold M.
In order to prevent the hollow skin 1 from dropping and slipping, a projection 2 or a concave groove 3 is provided on a part of the outer surface side of the hollow skin 1 as shown in FIGS. In this case, if there is a protrusion or a groove on the surface side that is visible to the customer, the appearance is impaired. Therefore, it is provided on the opposite side.

Whether the projection 2 or the concave groove 3 is adopted is selected depending on the type of the injection mold.

That is, as shown in FIG. 3, the injection mold M is a core mold a.
And a cavity mold b and a slide mold c, a projection 2 is provided on a part of the outer surface side of the hollow skin 1, and the projection 2 is sandwiched between the core mold a and the slide mold c of the molding die to form the hollow skin 1. On the other hand, when the injection mold M is composed of the core mold a and the cavity mold b as shown in FIG.
And a protruding portion a ' provided on the core mold a is formed with the concave groove 3.
And set it. The protrusion 2 has a height of 2 to 2.
8 mm, the width is usually about 0.5 to 2.0 mm, and in the case of the concave groove 3, the depth is 2 to 8 mm, and the width is 0.5 to 2.0 m.
The m-th position is normal.

In any case, with respect to the injection mold M,
The hollow skin 1 is held by a sandwiching or fitting structure to stabilize its position. In this state, the mold is clamped, and the resin material forming the hollow core body 5 into the hollow portion 4 of the hollow skin 1 is continued. Be injected. The resin forming the hollow core 5 is an ABS resin, nylon, polypropylene, polyethylene resin or the like, and a fibrous material such as polypropylene containing glass fiber or a needle-like filler such as talc or polypropylene containing mica can also be used.

The core resin is injected into the hollow skin 1 by a known gas injection method (gas injection) so that the core can be hollowed.

When the prevention of displacement is incomplete with only the projections 2, a wall-shaped convex portion 6 for controlling resin flow is provided along the surface of the skin as shown in FIG. . The height of the protrusion 6 is S = 1.0 to 2.0 m from the skin height.
Desirably.

The resin for the hollow core 5 is injected into the mold, and the inside of the core 5 is hollowed by gas injection.
In the case where the skin material and the core material do not achieve complete adhesion, a necessary part may be welded by ultrasonic welding or the like in some cases. For example, when a switch is mounted, a means for bonding the skin around the opening to be mounted and the core body, or partially bonding with a primer or the like may be used.

The above way the onset Ming interior part by integrally forming the hollow core member 5 in the hollow intraepidermal 1, for example, get a grip of the door with the grip portion shown, the present method grip It is needless to say that the present invention is similarly applied to other interior parts having.

[0022]

According to the present invention, there is provided a skin in which a hollow core body made of a synthetic resin is embedded in a hollow skin formed as described above.
Automobile interior parts integrally molded with a core body, in which a part of the outer skin is provided with a projection or a groove in a part of the outer skin so as to prevent displacement of the outer skin due to the flow of the resin during injection molding of synthetic resin on a part of the outer surface side of the hollow skin. The skin is formed in advance by rotational molding, slash molding, etc., and the core is injected into the interior, so there is no parting line on the surface of the skin, providing interior parts with good appearance and soft feeling In addition, the core can be hollowed by gas injection in molding the core, so that the weight can be reduced. In particular, since the interior parts of the present invention have a hollow core and are integrally formed inside the hollow skin, even if the adhesiveness between the hollow skin and the core is somewhat incomplete, peeling, falling off, and other general defects may occur. There is also an effect that the amount of resin used is small and the cost is also advantageous, and furthermore, the protrusion on the outer surface of the skin,
Since the surface of the skin does not shift due to the concave groove, injection molding at the time of manufacturing is easy and the quality is improved.

[Brief description of the drawings]

FIG. 1 is a partial view showing a structural example of an interior part according to the method of the present invention.

2A and 2B show examples of a hollow skin in the present invention, wherein FIG. 2A is a perspective view, FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A, and FIG. FIG.

FIG. 3 is an explanatory sectional view showing a state in which a skin having a projection is set in a molding die.

FIG. 4 is an explanatory cross-sectional view showing a state in which a skin having a concave groove is set in a molding die.

FIG. 5 is an explanatory sectional view showing an example of a shape of a boundary portion with a skin.

FIG. 6 is a perspective explanatory view showing a usage example of the interior component of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow skin 2 Projection 3 Groove 4 Hollow part of skin 5 Hollow core M Mold

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60J 5/04 B60J 3/02

Claims (1)

(57) [Claims] 1. A method for manufacturing an automobile interior part, comprising: setting a molded hollow skin in an injection mold, and then injection-molding a synthetic resin in the skin to integrally mold a hollow core in the skin. Protrusions or grooves are provided on a part of the outer surface side of the skin, and the protrusions or grooves are unevenly fitted with a core mold of a molding die,
Alternatively, an automobile having a hollow portion characterized in that a core-forming resin is injected into the interior of a hollow skin by gas injection after being clamped and fixed by a core type and a slide type, and the mold is clamped, and the hollow core is integrally formed. Manufacturing method of interior parts.