JPH10100193A - Resin molded product and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded product integrally molded from members formed from different resin materials and bonded in high strength, and to simply and economically produce the resin molded product. SOLUTION: A resin molded product 40 is constituted of a first molded member 41 molded from a first resin material and a second molded member 42 molded from a second resin material and molded so that one molded member 42 covers a part of the other molded member 41. Pref., one molded member 42 has an extraction preventing part 46 provided to at least one of the mutual contact surfaces of both molded members 41, 42 and the other molded member 41 is engaged with this extraction preventing part 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded article integrally formed of different resin materials and a method of manufacturing the same.

[0002]

2. Description of the Related Art Some resin molded articles are required to be integrally molded using different materials. One example is a cowl louver used for a vehicle, which is composed of a louver body and a protector section provided on an edge thereof and formed of a resin material softer than the louver body.

[0003] Molds have conventionally been used to manufacture molded articles from resin materials. As a technique for manufacturing an integrally molded article of a different material using a mold, for example, an integrated molding of a different material using a slide core provided on one side of a mold described in Japanese Patent Publication No. 63-44046. There is something to do. When the above-described cowl louver for a vehicle is molded using this technology, a burr is easily generated on the molded product due to the fact that the contact surface of the slide core is easily damaged,
In addition, there is a problem that a sufficient bonding strength cannot be obtained because the bonding area is small.

In order to solve this problem, Japanese Patent Application Laid-Open No. Hei 6-297504 has proposed that a gap be provided between a contact surface of a slide core and a mold on which the slide core is to be brought into contact. This technique is briefly described as follows.

[0005] As shown in FIG. 13, a slide core 17 is attached to one of two dies 15 and 16 to be clamped.
Is provided so as to be movable, and a contact surface 17a of the slide core 17 is provided.
A gap 19 is provided between the mold and the mold 15. As a result, the contact surface 17a of the slider core 17 is
A first cavity 18 including a gap 19 between the dies 15 and 16 and the slide core 17 is formed. After injecting the first resin material into the first cavity 18 and molding, the second resin material is injected into the second cavity 21 formed by moving the slide core 17 and molding from the first resin material. And molded in one piece.

[0006]

Problems to be Solved by the Invention
According to the technology described in Japanese Patent Application Publication No. 4 (1994) -44, for example, when manufacturing the above-described cowl louver for a vehicle, the joint area between the louver body member and the protector member is said to be larger than that according to the technology described in Japanese Patent Publication No. 63-44046. However, it was not always satisfactory to make the bonding strength between them sufficient.

Further, although there is an advantage that the louver main body member and the protector member can be integrally formed in one mold apparatus, such a complicated apparatus itself becomes large in size, and the apparatus is modified accordingly. Is essential, especially when starting a molding operation with a new mold)
In addition, the costs involved are enormous.

The present invention provides an integrally molded resin molded product having a high joining strength between molded members formed from different resin materials, and a method for easily and economically producing such a resin molded product. It is intended to provide.

[0009]

Means for Solving the Problems The resin molded product of the present invention comprises:
A first molded member obtained by molding the first resin material and a second molded member obtained by molding the second resin material are joined and integrated, and And one of the second molded members is formed so as to cover a part of the other molded member.

[0010] Preferably, one of the first and second molding members is provided on at least one of the surfaces where they contact each other to prevent the other molding member from being detached from the one molding member. A prevention part is provided, and the other molded member is engaged with the removal prevention part.

[0011] The method for manufacturing a resin molded product of the present invention comprises the steps of combining a first molded member obtained by molding a first resin material and a second molded member obtained by molding a second resin material. A method for producing a resin molded article that has been joined and integrated, wherein one of the first and second molded members has at least one of surfaces on which they are in contact with each other and one of these molded members has the other A first molding member is molded from a first resin material using a first molding die so that a detachment prevention portion for preventing detachment from the first molding member is formed. Disposing the second molding member from the second resin material, one of the first and second molding members covers a part of the other molding member, and the first molding member The second molding member is formed so as to be engaged with the removal prevention portion formed at the second position. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As schematically shown in the cross-sectional view of FIG. 1, a resin molded product 30 of the present invention comprises a first molded member 31 formed of a first resin material and a first molded member 31 formed of a first resin material. Second molded member 32 formed of a second resin material different from the resin material
The one molded member (in this case, the first molded member 31) partially covers the other molded member (in this case, the second molded member 32) from three directions. By doing so, the contact area between the first and second molded members is increased, so that the bonding strength between them is improved.

A preferred embodiment of the present invention will be described with reference to a sectional view of FIG. The resin molded product 40 of this embodiment includes a first molded member 41 and a second molded member 42, and one end 43 of the first molded member 41 is covered by the second molded member 42. . At the end 43 of the first molded member, there is formed a concave portion 45 serving as a detachment preventing portion, and the second molded member 42 has a convex portion 46 fitted into the concave portion 45 corresponding to the concave portion 45. Are formed. As described above, the first and second molded members are mechanically joined to each other by the engagement of the respective concave portions and convex portions, so that in the resin molded product of the present invention, the surfaces of the molded members of different materials are different from each other. The joining of the first and second molded members becomes stronger than in the case of the conventional integrally molded article made of dissimilar materials joined by simple contact.

In manufacturing the resin molded article 40 illustrated in FIG. 2, a first molding member 41 is molded from a first resin material using a first molding die (not shown), and then the first molding member 41 is molded. Disposing the first molding member 41 in a second molding die (not shown),
A cavity (not shown) for molding the second molded member is formed by the end 43 having the concave portion 45 of the first molded member and the second mold, and the second resin material is formed in the cavity. And the convex portion 4 engaged with the concave portion 43 of the first molding member.
6 is formed.

Contrary to this description, a projection may be formed in the first molding member instead of the depression 45, and a depression corresponding to the projection may be formed in the second molding member.
Further, the molded member 42 of FIG. 2 is first molded as a first molded member, and then the molded member 4 of FIG.
It is also possible to mold 1.

In the preferred embodiment shown in FIG. 2, a part (that is, the end 43) of one molded member is moved in three directions (FIG. 2).
, From above, below and right), but it is also possible to cover from only two directions. FIG. 3 schematically shows a resin molded product 40 'of this embodiment. In this figure, the members and their parts in the figure are given the same reference numerals (41, 42, 43, 45, 46) as used in FIG. Such a molded product 40 'is effective when the bonding strength in the vertical direction (directions indicated by arrows A and A') in the figure is not so required. Further, as a modification of this embodiment,
As in the resin molded body 40 ″ illustrated in FIG. 4, one that covers only one surface (the upper surface in this case) of the end portion 43 of the first molded member 41 is also possible.

In the present invention, various other modes are possible. For example, as illustrated in FIG. 5, a hole (or a long hole) that functions as a detachment prevention portion in one molded member 111.
The other member 113 can be formed by drilling the hole 112. Alternatively, as shown in FIG. 6, a projection 122 having a semicircular cross section may be provided on one molding member 121, and the other molding member 123 may be molded. The protrusion 122 may have a fine grain shape.

As shown in FIG. 7, it is also possible to provide a saw-shaped portion 132 on one molding member 131 and mold the other molding member 133. Further, as shown in FIG. 8, a taper 142 may be formed on one molding member 141 so that the tip thereof is enlarged, and the other molding member 143 may be molded. Alternatively, as shown in FIG. 9, sink marks 1 generated when one of the molding members 151 is molded.
The other molding member 153 may be molded using the 52 as a concave portion for preventing detachment.

The resin material used for producing the resin molded article of the present invention may be any of the resins used in ordinary injection molding and the like. For example, resin materials such as polypropylene (PP), acrylonitrile-EPDM (ethylene-propylene-diene terpolymer) -styrene copolymer (AES), and thermoplastic elastomer can be used. Of course, in the present invention, it is needless to say that different kinds of resin materials selected from such resin materials are used.

[0020]

Next, the present invention will be further described with reference to embodiments illustrating a cowl louver used as a vehicle part and its manufacture.

As shown in FIG. 10A, which is a perspective view of FIG. 10A and FIG. 10B, which is a partially enlarged sectional view taken along the line bb, a cowl louver 50 embodying the present invention includes a louver body 51 made of polypropylene resin. And a protector portion (also referred to as a seal portion) 52 made of an elastomer resin provided at one edge thereof, and the louver body 5 is provided.
A concave portion 53 is provided on the edge portion (end portion) 53 as a detachment preventing portion.
a, 53b are provided, and the protector portion 51 is formed with a convex portion that fits into these concave portions.

The cowl louver 50 can be manufactured as follows. As shown in FIG. 11, a louver body 51 previously formed by another injection molding machine not shown in the figure is formed into a molding device 6 for molding a protector portion.
0 mold. At this time, the portions provided with the concave portions 53a and 53b (FIG. 10B) for joining the protector portions are arranged in the mold.

Here, the molding device 60 will be described.
Is a fixed type, 64 is a movable type, and 65 is a clamping device for clamping. In this embodiment, three injection nozzles 66a and 66 are used for molding the protector portion.
b, 66c. Reference numeral 67 denotes a toggle arm pivotally supported by the movable mold 64 and the air cylinder 68. The movable mold 64 is moved in the vertical direction by the operation of the air cylinder 68. Air cylinder 68 is beam 6
9 and the left air cylinder shown in FIG. 11 is exposed and shown. Also, in FIG. 11, a cavity for molding the protector portion formed when the fixed mold 63 and the movable mold 64 are clamped is shown by 70. Although not shown in this drawing, a guide portion for guiding the movable mold 64 in the up and down direction and a guide portion for guiding the air cylinder 68 in the direction of arrow B in the drawing are usually provided.

When the louver main body 51 is set on the fixed mold 63 of the molding apparatus 60 as shown in FIG. 11, the movable mold 64 is lowered by the air cylinder 68 to be combined with the fixed mold 63, and as shown in FIG. As described above, the protector portion forming cavity 70 is formed by the edge 72 of the louver main body, the fixed mold 63, and the movable mold 64. Subsequently, the solid mold 63 and the movable mold 64 are clamped by the clamp device 65 (FIG. 11).

Next, a resin material for molding the protector portion is injected into the cavity 70 by the injection devices 66a to 66c, and after cooling and solidification, the engagement state of the clamp device 65 (FIG. 11) is released, and the air cylinder is released. The movable cowl 64 is moved upward by 68 (FIG. 11) to complete the cowl louver 5.
0 (FIG. 10) is taken out of the fixed mold 63.

In the above embodiment, a cowl louver for a vehicle and its manufacture have been described. However, the present invention is not limited to this, and various kinds of resin molded articles integrally formed by joining different kinds of resin materials can be used. It is widely applicable to its manufacture. For example, the present invention can be applied to a resin exterior component such as a garnish for a vehicle or a resin interior component such as an instrument panel.

[0027]

As is apparent from the above description, according to the present invention, in a resin molded product in which members formed of different resin materials are joined and integrally molded, one molded member is formed of the other molded member. Covering a part increases the joint area between the two members, thereby increasing the joint strength between the two members. Furthermore, by providing one of the molded members with a detachment prevention portion and engaging the other molded member with the detachment prevention portion, the joining strength between the two members is significantly increased.

The resin molded product of the present invention is disclosed in
Molding used in ordinary resin molding without using a molding device having a complicated mold provided with a slide core as in the prior art described in JP-A-44046 and JP-A-6-297504. The molding can be carried out with a simple device equipped with a mold, so that the cost of modifying the device (especially when starting a new mold) and the cost involved can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a resin molded product of the present invention.

FIG. 2 is a diagram illustrating a resin molded product according to another embodiment of the present invention.

FIG. 3 is a diagram illustrating a resin molded product according to still another embodiment of the present invention.

FIG. 4 is a diagram illustrating a resin molded product according to still another embodiment of the present invention.

FIG. 5 is a diagram for explaining one of possible modes in the present invention.

FIG. 6 is a diagram for explaining one of possible modes in the present invention.

FIG. 7 is a diagram for explaining one of possible modes in the present invention.

FIG. 8 is a diagram for explaining one of possible modes in the present invention.

FIG. 9 is a diagram for explaining one of possible modes in the present invention.

10A and 10B are diagrams illustrating a cowl louver for a vehicle according to the present invention, wherein FIG. 10A is a perspective view thereof, and FIG. 10B is a partially enlarged sectional view thereof.

11 is a perspective view illustrating a molding device used for manufacturing the cowl louver for the vehicle shown in FIG.

FIG. 12 is a diagram for explaining integral molding of a louver body and a protector portion of the cowl louver.

FIG. 13 is a diagram for explaining the technique disclosed in Japanese Patent Application Laid-Open No. 6-297504.

[Explanation of symbols]

 40, 40 ′, 40 ″ resin molded product 41 first molded member 42 second molded member 43 end portion 45 concave portion 46 convex portion 50 cowl louver 51 louver body 52 protector portion 53a, 53b ... recess 60 ... molding device 63 ... fixed mold 64 ... movable mold 66a, 66b, 66c ... injection device 70 ... protector part molding cavity

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29L 31:30

Claims (4)

[Claims] 1. A resin molding in which a first resin member obtained by molding a first resin material and a second molding member obtained by molding a second resin material are joined and integrated. Goods,
A resin molded product, wherein one of the first and second molded members is molded so as to cover a part of the other molded member. 2. A detachment prevention in which one of the first and second molded members prevents at least one of the surfaces contacting each other from detaching the other molded member from the one molded member. The resin molded product according to claim 1, further comprising a portion, wherein the other molding member is engaged with the detachment prevention portion. 3. The molded article is a cowl louver for a vehicle,
The resin molded product according to claim 1, which is a garnish or an instrument panel. 4. A resin molding in which a first molded member obtained by molding a first resin material and a second molded member obtained by molding a second resin material are joined and integrated. A method of manufacturing an article, wherein one of the first and second molded members prevents one of these molded members from falling out of the other on at least one of the surfaces where they contact each other. The first molding member is molded from the first resin material using the first molding die so that the detachment prevention portion is formed, and then the first molding member is arranged in the second molding die. The second molded member is made of the second resin material, and one of the first and second molded members covers a part of the other molded member, and the detachment preventing portion formed on the first molded member. A method of manufacturing a resin molded product, wherein the molding is performed so that a second molded member is engaged with the molded product.