JP2574845Y2 - Resin molding - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product which is a decorative component such as a radiator grill for an automobile.

[0002]

2. Description of the Related Art Conventionally used radiator grills for automobiles are molded by injection molding with a resin in view of productivity, weight reduction, economy, and the like. The product is subjected to a surface treatment and is formed to have a luster and a design as if it were a metal product in appearance. Naturally, in order to maintain the same strength as metal, these resin molded products are formed integrally with a reinforcing wall 3 at an appropriate position on the back side of the front molding portion 2 of the radiator grill 1 as shown in FIG. Is what it is.

[0003]

However, in the case of such a resin molded product in which the reinforcing wall 3 is integrally formed, the front molding 2 and the reinforcing wall 3 are integrally formed to form the front molding. The molding part 2 and the reinforcing wall 3 on the surface of the part 2
2 and 3, sink marks (dents) 4 are generated after the injection molding, and the appearance and quality of the resin molded product 1 are impaired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and comprises a resin molded body and a reinforcing rib integrally formed on the back side of the resin molded product body. in the resin molded article, by forming a gap in the connection portion between the reinforcing ribs the resin molding body portion, a sink mark occurs due to heat shrinkage of the reinforcing ribs at the time of resin molding as allowed to absorbed by the clearance resin molding body It is an object of the present invention to provide a resin molded product that can prevent sink marks on the surface of a part.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

4 to 6, reference numeral 11 denotes an upper wall surface 1.
2, a frame portion 15 having a substantially U-shaped side surface composed of a lower wall surface 13 and a front wall 14 formed between the upper wall surface 12 and the lower wall surface 13, and integrally formed on the back side of the resin molded product main body portion 15. is formed, but its resin molding body portion 15 resin molded article comprising the reinforcing ribs 16. for allowing reinforce (showing a part of the radiator grille automotive parts in the present embodiment), the resin molding body The reinforcing rib 16 of the portion 15 is
And the lower wall 13, and are separated from the back side of the front wall 14 by a gap 17. The reinforcing ribs 16 have a thickness a that allows the reinforcing ribs to have sufficient strength as a reinforcing body, but the joint of the reinforcing ribs 16 with the upper wall surface 12 prevents the occurrence of sink marks on the upper wall surface 12. In order to achieve this, it is formed thin. The reinforcing rib 16 is formed with a through hole 18 so as to reduce the amount of resin material used and to reduce the weight of a molded product.

In order to mold the resin molded article 11 having such a shape, it is possible to perform injection molding of the resin molded article by using a slide mold A as shown in FIG.

FIGS. 8 and 9 show another embodiment of the present invention. In this embodiment, a reinforcing rib 16 has one or a plurality of extending ribs extending in a direction perpendicular to a side surface of the reinforcing rib 16. A portion 19 is formed to increase the strength of the reinforcing rib 16. Resin molded product 1 of this embodiment
By using a slide mold B as shown in FIG. 9, 1 'enables injection molding of the resin molded product 11'.

[0009] or more In any of the above embodiments as described above, the reinforcing rib 16 of the resin molding body portion 15 is the resin formed
A gap 17 is formed between the back surface of the front wall 14 and the reinforcing rib 16 so as not to be connected to the back surface of the front wall 14 of the molded article main body 15. The sink due to the reinforcing ribs 16 generated during the injection molding of the resin 11 and 11 ′ is absorbed by the gap 17, and the resin molded article 11, 11 ′ does not have a sink at least on the front wall, and is excellent in quality and appearance. A molded article is obtained.

In each of the above embodiments, the reinforcing ribs 16 are used.
Are the upper wall 12 and the lower wall 13 of the resin molded product main body 15
However, since the upper surface wall 12 and the lower surface wall 13 are portions hidden by the vehicle body, there is no problem even if sink occurs.

However, since the upper surface wall 12 is a prominent portion, the reinforcing ribs 16 are provided as in this embodiment.
By reducing the thickness of the joint with the upper surface wall 12 in the above, the degree of sink marks can be reduced.

[0012]

As described above, according to the first aspect of the present invention, a resin having a substantially U-shaped cross section on the side including the upper wall surface 12, the lower wall surface 13, and the front wall 14 formed between the upper and lower wall surfaces 12,13. When the molded article main body 15 is integrally molded by injection molding,
In a resin molded product having a reinforcing rib 16 for reinforcing the main body 15 integrally provided on the back surface of the resin molded product main body 15 , the reinforcing rib 16 is separated from the front wall 14 by a gap 17. The reinforcing ribs 16 are separated from each other and are integrally provided between the upper and lower wall surfaces 12 and 13.
2, the resin molded article can prevent sink marks on the front wall 14 and reduce sink marks on the upper wall surface 12.
The appearance and quality of the resin molded product having the design surface and the front wall 14 are not impaired, and the resin molded product main body 11 having a substantially U-shaped side section is reinforced in the vertical pressing direction and the vertical pulling direction. Can be secured sufficiently. According to a second aspect of the present invention, a resin molded product main body portion 15 having a substantially U-shaped cross section on the side formed by an upper wall surface 12, a lower wall surface 13, and a front wall 14 formed between the upper and lower wall surfaces 12, 13 is integrally formed by injection molding. While molding
In a resin molded product in which a reinforcing rib 16 for reinforcing the main body 15 is integrally provided on the back surface of the resin molded product main body 15 , the reinforcing rib 16 has a gap 17 with the front wall 14.
And an extending rib portion 19 extending integrally with the reinforcing rib 16 in a direction perpendicular to the reinforcing rib 16 is integrally formed between the upper wall surface 12 and the lower wall surface 13. Because of the structure, the resin molded article main body 11
The effect that the strength in the vertical pressing direction and the vertical pulling direction can be further enhanced.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a main part of a conventional example.

FIG. 2 is a plan sectional view of a conventional example.

FIG. 3 is a side sectional view of a conventional example.

FIG. 4 is an explanatory perspective view of a main part of the embodiment of the present invention.

FIG. 5 is a rear view of FIG. 4;

FIG. 6 is a side view of FIG. 4;

FIG. 7 is a plan sectional view of FIG. 4;

FIG. 8 is an explanatory perspective view of a main part showing another embodiment of the present invention.

FIG. 9 is a plan sectional view of FIG. 8;

[Explanation of symbols]

11, 11 '... resin molded product 12 ... upper wall surface 13 ... lower wall surface 14 ... front wall 15 ... resin molded product main body 16 ... reinforcing rib 17 ... gap 18 ... through hole 19 ... extended rib portion

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/00-45/84 B29L 31:30

Claims (2)

(57) [Scope of request for utility model registration] 1. A front wall (1) formed between an upper wall surface (12), a lower wall surface (13), and upper and lower wall surfaces (12) and (13).
4) A resin molded product main body (1
5) is integrally molded by injection molding, and the resin
In a resin molded product, a reinforcing rib (16) for reinforcing the main body (15) is integrally provided on a back surface of the molded product main body (15) , wherein the reinforcing rib (16) is provided on the front wall (14). From the upper and lower wall surfaces (12), (1)
3) being integrally erected between the reinforcing ribs (16)
Is a resin molded product characterized in that the joint with the upper wall surface (12) is set thin. 2. A front wall (1) formed between an upper wall surface (12), a lower wall surface (13), and upper and lower wall surfaces (12) and (13).
4) A resin molded product main body (1
5) is integrally molded by injection molding, and the resin
In a resin molded product, a reinforcing rib (16) for reinforcing the main body (15) is integrally provided on a back surface of the molded product main body (15) , wherein the reinforcing rib (16) is provided on the front wall (14). From the upper and lower wall surfaces (12), (1)
3) being integrally erected between the reinforcing ribs (16)
A resin molded product, characterized in that an extension rib portion (19) extending in a direction perpendicular to the above is integrally formed between an upper wall surface (12) and a lower wall surface (13).