JPH0858384A - Automobile interior part having hollow part and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide an automobile interior part having a gripping shape of light weight with a soft feeling, by preventing a skin from coming off, preventing its displacement, and injecting a core body hollowed in the hollow skin. CONSTITUTION: A protrusion 2 or recessed groove is provided partly in arm external surface side of a premolded hollow skin 1, and after mold clamping is performed by irregularity fitting to an injection molding core die or by clamping by the core die and slide die, a resin for a core body is injected into inside the hollow skin 2 by gas injection, to mold an automobile interior part 10 by integrally molding the hollow core body 5 in the inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior part having a hollow portion, and more particularly to an interior part having a grip shape such as a grip mounted on an automobile door and a method for manufacturing the same.

[0002]

2. Description of the Related Art Recently, as shown in FIG. 6, a grip 10 has been adopted as an accessory for a door of an automobile or the like for operability when opening and closing and for stabilizing when getting on a vehicle. It is constituted by a single material of resin, or by injection-molding vinyl chloride resin on a resin or a metal core, and integrally covering the resin.

[0003]

However, the above-mentioned grip requires a combination of a plurality of parts in terms of the structural surface and the touch surface, and particularly in the case of integral coating by injection molding, either the skin material or the core material is selected depending on the outer shape. Since it is necessary to cope with molding with the amount of material input, it becomes impossible to use more than necessary material, there are difficulties in terms of weight and cost, and in some cases, to improve the surface quality, Sometimes it may be necessary to apply paint. Moreover, in the case of injection molding, incomplete adhesion may occur due to the positional deviation between the skin and the core, and the skin may be peeled off or fallen off.

The present invention copes with the actual situation as described above, and particularly paying attention to the holding and fixing by fitting and attaching the outer skin and the injection mold, the outer skin is prevented from falling and slipping, and the core body is placed inside the hollow outer skin. It is an object of the present invention to provide an interior part having a soft grip and light weight by injection and hollowing.

[0005]

In order to meet the above objects, the present invention provides a hollow core body made of synthetic resin in which a protrusion or a groove is provided on a part of the outer surface side of a preformed hollow skin. An automobile interior component is formed by integrally molding.

The present invention also provides, as a method for manufacturing the above-mentioned interior parts, a projection or a concave groove provided on a part of the outer surface side of a preformed hollow skin so as to make a concave-convex fit with a core mold of an injection molding mold, or a core mold. After clamping with a slide mold and clamping, the resin for core is injected into the hollow skin by gas injection, and the hollow core is integrally molded into the inside.

[0007]

According to the above interior parts and manufacturing method of the present invention, the hollow body skin is preformed, and the hollow body skin is clamped by concavo-convex fitting in the core die of the injection molding die for molding the core or by the slide structure of the die. After that, interior resin is created by injecting the core resin into the hollow skin inside the mold and injecting gas to hollow the core, but it is possible to reduce the weight because the core itself is hollow. Moreover, since the resin for core is injected into the epidermis, a parting line does not occur on the surface of the epidermis, and the hollow epidermis peels off even if the adhesion with the core is incomplete,
It does not cause general imperfections such as falling off, is light in weight as a whole, has a soft feel, and can form interior parts with a good appearance.

[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 the interior component of the present invention, in which 1 is a hollow skin,
Reference numeral 5 denotes a hollow core body having a hollow portion 7 therein,
5 has an integrated structure. The hollow skin 1 is provided with the protrusion 2 which is a feature of the present invention.

FIG. 2 shows an example of the hollow skin in the interior part of the present invention. The hollow skin 1 is usually formed by slush molding.
It is molded prior to integral molding with the core body 5 in the present invention by rotational molding or blow molding depending on the shape.

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

Here, as the skin material of the hollow skin 1, a thermoplastic elastic material such as 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 the 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 to integrate the hollow core resin. The interior parts of the present invention as described above are molded.

Therefore, the hollow skin 1 is placed in the injection mold M.
When setting, the protrusion 2 or the 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 noticeable to the customer, the appearance will be impaired, so it should be provided on the opposite side.

Whether the projection 2 or the concave groove 3 is adopted is selected according to the type of injection molding die.

That is, as shown in FIG. 3, the injection mold M is the core mold a.
In the case of the cavity mold b and the slide mold c, a protrusion 2 is provided on a part of the outer surface side of the hollow skin 1, and the protrusion 2 is sandwiched between the core mold a and the slide mold c of the molding die to form the hollow skin 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.
The recessed groove 3 is provided on the core mold a, and the protruding portion 5 provided on the core die a is fitted into the recessed groove 3 and set. The height of the protrusion 2 is 2 to 8
In general, the groove 3 has a depth of 2 to 8 mm and a width of 0.5 to 2.0 mm.

Thus, in any case, for the injection mold M,
The hollow skin 1 is held by a sandwiching or fitting structure, its position is stabilized, and the mold is clamped in this state, and the material resin forming the hollow core body 5 into the hollow portion 4 of the hollow skin 1 continues. Is ejected. The resin forming the hollow core 5 is an ABS resin, nylon, polypropylene, polyethylene resin, or the like, and fiber type polypropylene such as glass fiber-containing polypropylene or 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) to make the core hollow.

If the deviation 2 is not sufficient to prevent the deviation, a wall-shaped convex portion 6 for controlling the resin flow is provided along the surface of the skin as shown in FIG. . The height of the convex portion 6 is S = 1.0 to 2.0 m from the skin height.
Is desirable.

Further, as a result of injecting the resin for the hollow core 5 into the mold and making the inside of the core 5 hollow by gas injection,
When the skin material and the core material do not reach the perfect adhesion, in some cases, necessary necessary portions are welded by ultrasonic welding or the like. For example, when a switch is attached, a means for adhering the outer skin around the opening to be attached and the core body, or partially adhering with a primer or the like may be used.

By integrally molding the hollow core body 5 in the hollow skin 1 as described above, the interior parts of the present invention, for example,
Although the door grip having the illustrated grip portion is obtained, it goes without saying that the present invention is similarly applied to other interior parts having the grip portion.

[0022]

EFFECTS OF THE INVENTION The present invention is a skin in which a hollow core body made of a synthetic resin is embedded in the hollow skin formed as described above.
An automobile interior part integrally molded with a core provided with protrusions or recessed grooves on a part of the outer surface of the hollow skin so as to prevent displacement of the skin due to resin flow during synthetic resin injection molding The outer skin is preformed by rotational molding, slush molding, etc., and the core is injected inside, so there is no parting line on the surface of the outer skin, providing an interior part with a good appearance and a soft feeling. In addition to the above, the core can be hollowed by gas injection in molding the core, so that weight reduction can be achieved. In particular, the interior parts of the present invention have a hollow core and are integrally molded inside the hollow skin, so even if the adhesion between the hollow skin and the core is somewhat incomplete, general problems such as peeling and falling may occur. In addition, the amount of resin used is small, which is advantageous in terms of cost.
Since the groove does not cause the skin to be displaced, injection molding at the time of manufacture is easy and the quality is improved.

[Brief description of drawings]

FIG. 1 is a partial view showing a structural example of an interior component of the present invention.

FIG. 2 shows an example of a hollow skin according to the present invention, (a) is a perspective view, (b) is a sectional view taken along the line AA of (a), and (c) is a cross section showing another modified shape example in the same cross section. It is a figure.

FIG. 3 is a cross-sectional explanatory view showing a state in which a skin having protrusions is set in a molding die.

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

FIG. 5 is an explanatory cross-sectional view showing an example of the shape of the mold at the boundary with the skin.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow skin 2 Protrusion 3 Recessed groove 4 Hollow part of skin 5 Hollow core M Mold

Claims (2)

[Claims] 1. An automobile interior part having a hollow core body made of synthetic resin integrally molded inside a molded hollow skin, wherein the hollow skin has protrusions or concave grooves on a part of the outer surface side. An automobile interior part having a hollow portion characterized by the following. 2. 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 into the skin to integrally mold a hollow core into the skin. Providing a protrusion or a concave groove on a part of the outer surface side of the skin, and fitting the protrusion or the concave groove with the core die of the molding die in a concavo-convex manner,
Alternatively, an automobile having a hollow portion characterized by sandwiching and fixing by a core mold and a slide mold, clamping the mold, and then injecting a resin for a core body into the inside of the hollow skin by gas injection to integrally mold the hollow core body. Interior parts manufacturing method.