JP2780416B2 - Vehicle resin molded article and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a resin molded product for a vehicle, particularly a resin molded product for a vehicle such as a body side molding and a finisher having a mounting surface and a decorative surface to a vehicle body, and a method of manufacturing the same. It is about.

[Conventional technology]

A resin molded product for a vehicle such as a molding is attached to a vehicle body by an attachment surface that is not visible from the outside, and a portion that is visible from the outside other than the attachment surface is a decorative surface. As such a resin molded product, a hollow injection molded product has been proposed for weight reduction (for example, Japanese Patent Application Laid-Open No. 57-167217).
issue).

A conventional resin molded product made of a hollow injection molded product is obtained by injecting a predetermined amount of resin from an injection nozzle into a cavity of an injection mold, and then also blowing out gas from the injection nozzle to spread the resin in the cavity and mold the mold surface. And a hollow part is formed inside.

However, since such a conventional resin molded product is manufactured as described above, the air ejection port formed in the gate portion is exposed to the side of the resin molded product and is visually observed from the outside, so that the appearance is remarkably improved. Harm. In order to improve such a point, if the air ejection port of the gate portion exposed to the outside is covered, the inside hollow portion has a hermetic structure, and bulges or dents due to a change in temperature and impairs the appearance. In addition, such a resin molded product is attached to a vehicle body panel with a mounting clip or the like, but a separate mounting operation is required in order to fix the mounting member such as the mounting clip to a flat mounting surface formed thin. There was a point.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a vehicle resin made of a hollow injection-molded article having an excellent appearance, having no deformation due to a temperature change or the like, and capable of being easily and accurately mounted. It is to propose a molded article and a method for producing the same.

[Means for solving the problem]

The present invention relates to the following resin molded article for vehicles and a method for producing the same.

(1) A hollow molded product main body having a mounting surface to a vehicle body and a decorative surface, a positioning portion integrally formed on a mounting surface of the molded product body so as to engage with a positioning portion of the vehicle body, and the positioning portion A resin molded article for a vehicle, comprising: a ventilation hole that penetrates through and communicates with a hollow portion of a molded article main body; and a mounting member for a vehicle body provided on a mounting surface.

(2) The resin molded product for a vehicle according to the above (1), wherein the positioning portion is a cylindrical protrusion.

(3) The resin molded article for vehicles according to the above (1) or (2), wherein the mounting member is a double-sided adhesive tape.

(4) A predetermined amount of resin is injected into a cavity of an injection mold having a mold surface forming a decorative surface and a mold surface forming a mounting surface and a positioning portion, and a part of the molded product body and the positioning portion are formed. (1) or (2), wherein after forming, a compressed gas is blown into the cavity from the positioning portion, and the resin is pushed and spread into the cavity to form a molded article main body, a hollow portion, and a ventilation hole. Production method of resin molded article for vehicles.

(Operation)

The resin molded article for a vehicle according to the present invention is characterized in that a predetermined amount of resin is injected into a cavity of an injection mold having a mold surface forming a decorative surface and a mold surface forming an attachment surface and a positioning portion, and the molded product body is formed. After forming a part and a positioning part, compressed gas is injected into the cavity from the positioning part, and the resin is pushed and spread into the cavity to form a molded article main body, a hollow part, and a ventilation hole.

The resin molded article for a vehicle manufactured in this manner is mounted by the mounting member in a state where the positioning portion formed on the mounting surface is engaged with the positioning portion of the vehicle body. Even if the temperature changes during use, the gas in the hollow portion enters and exits through the vent hole, so that the molded article main body does not swell or dent. Further, since the opened ventilation hole is located on the mounting surface side, it is not visible from the outside and does not impair the appearance.

〔Example〕

 Hereinafter, the present invention will be described with reference to embodiments of the drawings.

FIG. 1 is a perspective view showing a resin molded product for a vehicle according to an embodiment, FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a partially enlarged view thereof, and FIG.

In the figure, 1 is a resin molded product (molding),
A molded product body 6 made of a long hollow injection molded product and having a hollow portion 5 between a mounting surface 3 for attaching to a vehicle body panel 2 and a decorative surface 4
Cylindrical positioning portions 7a, 7 integrally projecting from the mounting surface 3
has b. The positioning portions 7a and 7b have fin-shaped protrusions 9 having tapered guides 8 at their ends in the radial direction, and are engaged with positioning holes 10a and 10b formed in the vehicle body panel 2. A ventilation hole 11 is provided through one of the cylindrical positioning portions 7 a in the axial direction, and communicates with the hollow portion 5. The mounting surface 3 is formed in a shape corresponding to the vehicle body panel 2, and has a double-sided adhesive (contact) adhesive tape 12 as an mounting member. Reference numeral 13 denotes a lip formed on the periphery of the molded article body 6 so that the double-sided adhesive tape 12 is shielded from the decorative surface side. Reference numeral 14 denotes a hole formed in the double-sided adhesive tape 12 at the position where the positioning portions 7a and 7b are inserted. It is. The molded product body 6 and the positioning portions 7a and 7b are made of polypropylene, polyethylene, ABS,
It is formed integrally with general-purpose resin such as PVC and engineering resin such as PPO, polyamide and polycarbonate resin.

5 to 7 are sectional views of an injection mold showing a manufacturing method of the embodiment, and FIG. 8 is a partially enlarged view thereof. In the figure, reference numeral 20 denotes an injection mold, a cavity mold 21 and a core mold.
A cavity 23 is formed between 22. Cavity mold 21
Has a mold surface 24 that forms the decorative surface 4 of the molded article 1. The core mold 22 has a mold surface 25 that forms the mounting surface 3, and the mold surface 25 is provided with positioning portion forming portions 26a and 26b that form the positioning portions 7a and 7b. A gas ejection nozzle 27 is connected to one of the positioning portion forming portions 26a, and a gas ejection passage 28 opens to the cavity 23, but detailed illustration is omitted. An injection nozzle 30 of an injection molding machine can be connected to a gate 29 formed at one longitudinal end of the cavity 23.

As shown in FIG. 5, the method for manufacturing the resin molded article 1 is as follows: the cavity mold 21 and the core mold 22 of the injection mold 20 are closed, and the gas ejection path 28 is closed. A predetermined amount of heated and molten resin 31 sufficient to mold a hollow molded article into the cavity 23 is injected, and a part of the cavity 23 and a positioning part forming part near the gate 29 are formed.
Fill 26a. Then, the valve of the injection nozzle 30 is closed to stop the injection of the resin and to prevent the resin 31 in the cavity 23 from flowing back to the injection nozzle 30 side.

At this time, the portion of the resin 31 in contact with the mold surfaces 24 and 25 is hardened somewhat by cooling, as compared with the inside, to form a part of the molded article main body 6 and the positioning portion 7a. When preferably from gas ejection path 28 for ejecting the chemical compressed gas, such as inert N ₂ in this state, as shown in FIG. 6 and FIG. 8, the compressed gas of the positioning portion forming portion 26a and the cavity 23 The resin 31 in the molten and flowable state inside is spread out into the cavity 23 and is attached to the mold surfaces 24 and 25, as shown in FIG.
The molded article main body 6, the positioning portions 7a and 7b, the hollow portion 5, and the ventilation hole 11 are formed.

By cooling while maintaining the gas pressure in this state,
A resin molded product 1 is obtained.

In the resin molded product 1 manufactured in this manner, the positioning portions 7a and 7b formed on the mounting surface 3 are aligned with the positioning holes 10 of the vehicle body panel 2.
In the state of being engaged with a and 10b, it is attached to the vehicle body panel 2 by a double-sided adhesive tape 12 as an attachment member. Even if the gas in the hollow part expands or contracts due to a temperature change during use, the gas in the hollow part 5 enters and exits through the vent hole 11 so that the pressure in the hollow part is maintained at the atmospheric pressure, and the molded article body 6 does not bulge or dent. In addition, since the ventilation hole 11 having an opening is located on the mounting surface 3 side, it is not seen from the outside and does not impair the appearance.

The projections 9 formed on the positioning portions 7a, 7b prevent the positioning portions 7a, 7b from being deformed at the time of mounting work to the main body, thereby improving the positioning accuracy, facilitating the formation of the guide 8, and dissipating heat when the resin 31 is injected. This speeds up the curing of the positioning portions 7a and 7b, and is effective in preventing the positioning portion 7a from being disturbed at the time of gas ejection.

FIG. 9 is a sectional view of a resin molded product of another embodiment. In this embodiment, the positioning portion 7a is formed in a concave shape, and engages with a positioning projection provided on the vehicle body panel 2. The arrow in FIG. 9 indicates the injection direction of the resin.

In the above description, when the compressed gas is continuously ejected from the gas ejection nozzle 27 to the mounting surface 3 where the positioning portions 7a and 7b are not formed, the cured resin 31 is easily peeled from the mold surface 25,
If the compressed gas is ejected by connecting the gas ejection nozzle 27 to the portion where the positioning portion 7a is formed irrespective of the convex shape or the concave shape, peeling of the resin 31 from the mold surface in the positioning portion forming portion 26a hardly occurs, and the compressed gas is By breaking through the bottom of the just-formed positioning portion 7a, the resin 31 in a flowing state inside can be spread and the air hole 11 and the hollow portion 5 can be formed.

Although the above-described embodiment shows an example of molding as a resin molded product, the present invention is also applicable to other resin molded products. An adhesive or other bonding material can be used as the attachment member.

〔The invention's effect〕

Since the resin molded article for vehicles of the present invention has ventilation holes provided in the positioning portion formed integrally with the mounting surface of the hollow molded article main body, it has an excellent appearance and is free from deformation due to temperature changes and the like.
Moreover, mounting can be performed easily and accurately.

In the method for manufacturing a resin molded article for a vehicle according to the present invention, a predetermined amount of resin is injected into an injection mold, and then a compressed gas is blown from a positioning portion. By forming a ventilation hole and a hollow portion in the vehicle, the excellent resin molded article for a vehicle can be efficiently manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resin molded product for a vehicle according to an embodiment, and FIG.
The figure is a sectional view taken along line AA of FIG. 3, FIG.
5 is a sectional view of an injection mold showing a manufacturing method of the embodiment, FIG. 8 is a partially enlarged view of the injection mold, and FIG. 9 is a resin of another embodiment. It is sectional drawing of a molded article. In the drawings, the same reference numerals denote the same or corresponding parts, 1 denotes a resin molded product, 2 denotes a vehicle body panel, 3 denotes a mounting surface, 4 denotes a decorative surface,
5 is a hollow portion, 6 is a molded product main body, 7a and 7b are positioning portions, 10
a and 10b are positioning holes, 11 is a ventilation hole, 12 is a double-sided adhesive tape, 20 is an injection mold, 23 is a cavity, 26a and 26b are positioning portion forming parts, 27 is a gas ejection nozzle, 28 is a gas ejection path,
30 is an injection nozzle and 31 is a resin.

Continuation of front page (72) Inventor Yuho Fujikawa 320, Fujii, Kamiyabe-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture In-house Hashimoto Forming Industry Co., Ltd. (56) References JP-A-57-167217 (JP, A) JP-A Sho 63-183827 (JP, A) JP-A 2-294 (JP, U) JP-A 2-63254 (JP, U) JP-A 57-125654 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B60R 13/04 B62D 37/02 B29C 49/00-49/80 B29C 45/00

Claims (4)

(57) [Claims] A hollow molded product body having a mounting surface to a vehicle body and a decorative surface; a positioning portion integrally formed on a mounting surface of the molded product body so as to engage with a positioning portion of the vehicle body;
A resin molded product for a vehicle, comprising: a ventilation hole that penetrates the positioning portion and communicates with a hollow portion of the molded product body; and a mounting member for a vehicle body provided on a mounting surface. 2. The resin molded article for a vehicle according to claim 1, wherein the positioning portion is a cylindrical projection. 3. The resin molded article for vehicles according to claim 1, wherein the mounting member is a double-sided adhesive tape. 4. A predetermined amount of resin is injected into a cavity of an injection mold having a mold surface forming a decorative surface and a mold surface forming a mounting surface and a positioning portion, and is positioned with respect to a part of a molded article main body. After forming the part, a compressed gas is blown into the cavity from the positioning part, and the resin is pushed and spread into the cavity to form a molded article main body, a hollow part, and a ventilation hole. 2) The method for producing a resin molded article for a vehicle according to the above.