JP2000142110A - Door trim for automobile and manufacture of door trim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door trim for an automobile and its manufacturing method capable of molding a weather strip and door trim easily using one injection molding die. SOLUTION: A door trim is an injection molded, continued item in which a base joining surface 2a of a weather strip 2 is joined in a single piece with the joining surface 1a of the forefront of a garnish on the door trim body 1. Following this molding process for trim body, the weather strip is molded using one injection molding die composed of a trim molding die 10 furnished with a cavity 11 for molding the trim body and a guide part 13 of slide type, a weather strip molding die 20 equipped with a cavity 21 for molding a lip, and a slide die 30 arranged on the guide part 21 in such a way as capable of rising and falling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door trim for a vehicle in which a weather strip for windshield sealing made of an elastic material is mounted on a garnish portion of a rigid molded door trim body, and the door trim for a vehicle can be easily formed by one injection molding die. TECHNICAL FIELD The present invention relates to a method for manufacturing a door trim for an automobile, which can be formed to a shape other than the above.

[0002]

2. Description of the Related Art Conventionally, various door trims for automobiles in which a weather strip for window glass sealing is mounted on a garnish portion of a molded door trim main body have been proposed, and recently, Japanese Patent Application Laid-Open No. Hei 8-132479 has disclosed. As described above, a molded door trim main body and a weather strip have been integrally molded by injection molding.

However, even if the molded door trim body and the weather strip are integrally molded by injection molding, in the conventional case, the weather strip previously molded in a separate process is set in a door trim molding die. Since the weather strip is joined and integrated with the door trim main body by injection molding the door trim main body, there is a problem that the molding process is separate and the production efficiency is inferior. Further, there is a problem that it is necessary to prepare separate molds for the door trim and the weather strip, which increases the production cost.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a door trim product in which a weather strip is firmly adhered to a garnish portion of a molded door trim main body in a state where the weather strip is firmly fastened. It can be easily and efficiently molded by one injection mold,
It has been completed for the purpose of providing an automobile door trim and a method of manufacturing the same, which does not require separate molds, has low equipment costs and can reduce production costs.

[0005]

According to the present invention, there is provided a door trim for an automobile according to the present invention, in which a garnish portion of a rigid molded door trim body is provided with a weatherstrip for wind glass sealing made of an elastic material. In the automobile door trim, the molded door trim body and the weather strip are continuously connected by a single injection mold so that the base joint surface of the weather strip is joined and integrated with the joint surface formed at the tip of the garnish portion of the molded door trim body. It is characterized by being an injection-molded product integrally molded and integrated. Further, a method of manufacturing a door trim for an automobile according to the present invention includes a trim forming die having a cavity for molding a door trim body and a slide die guide portion, a weather strip forming die having a cavity for forming a lip portion, Using one injection molding die composed of a slide die movably arranged on a slide die guide portion, first, the weather strip molding die is matched with the trim molding die, and the slide die is raised. Injecting the door trim body molding material into the door trim body molding cavity with the opening end of the lip portion forming cavity closed with a slide mold to form a door trim body having a joint surface formed at the tip of the garnish portion, Subsequently, the slide die is lowered to join the joint surface of the garnish portion of the door trim main body formed in the previous process and the wafer. Forming a weatherstrip molding cavity communicating with the lip molding cavity between the mold surface of the strip molding die and injecting a weatherstrip molding material into the cavity, thereby forming a garnish end of the molding door trim body. The present invention is characterized in that a weather strip in which a base joint surface is joined and integrated with a joint surface is formed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a hard molded door trim main body made of a synthetic resin, and 2 denotes a weather strip for wind glass sealing made of an elastic material mounted on a garnish portion of the molded door trim main body 1. The molded door trim main body 1, the weather strip 2, Is formed by injection molding with a single mold, and the base joining surface 2a of the weather strip 2 and the joining surface 1a formed at the tip of the garnish portion of the molded door trim body 1 are joined and integrated. That is, the molded door trim body 1
The weatherstrip molding material flows into the joining surface 1a at the tip of the slab and solidifies as it is, so that the base joining surface 2a of the weatherstrip 2 is fixed to the molded door trim body 1.
And is firmly held by being joined to the joining surface 1a. 2b is a lip portion of the weather strip 2.

As shown in FIG. 2, a large number of engaging projections 1b are provided on the joint surface 1a at the tip of the molded door trim main body 1.
It is preferable that the two are more firmly held if they are integrally formed in a state where the base joint surface 2a of the weather strip 2 is engaged with the engagement projection 1b.
The molded door trim body 1 and the weather strip 2 are preferably made of the same plastic material. In particular, while the molded door trim body 1 is made of a polyolefin resin such as a hard polypropylene resin,
If the weatherstrip 2 is made of a polyolefin-based thermoplastic elastomer such as a polypropylene-based thermoplastic elastomer, all the requirements necessary for an automobile door trim such as the mechanical strength, durability and adhesive strength of the two and the elasticity of the weatherstrip 2 are obtained. It is particularly preferable because it is provided.

Next, a method of manufacturing such an automobile door trim will be described. The injection mold shown in FIGS. 3 and 4 shows one injection mold composed of a trim mold 10, a weatherstrip mold 20, and a slide mold 30.

A trim forming die 10 is provided between a lower fixed die 10b having a slide type guide portion 13 for allowing the slide die 30 to move up and down and an upper surface of a main portion of the fixed die 10b for forming a door trim main body. An upper movable mold 10a forming the cavity 11 is formed. A concave step portion is formed at one upper portion of the trim mold 10 so that the weatherstrip mold 20 can be freely fitted. 3
As shown in FIG. 4 and FIG.
The trim mold 10 is used, in which the slide mold guide portion 13 formed as a wide groove is formed so that the slide mold 30 having a frame shape can freely move up and down.

The weatherstrip molding die 20 to be matched with the trim molding die 10 is provided with lip-forming cavities 21, 21 whose opening ends face the one side of the trim molding die 10. The lower surface is a mold surface that forms a cavity 22 for forming a base portion between the trim mold 10 and the upper mold mating surface when the mold is mated with the trim mold 10. The mold 20 has a cavity 21 for molding a lip,
The upper and lower dies can be divided into two upper and lower dies so that the lip of the weather strip formed at 21 can be easily removed from the lip.

On the other hand, as shown in FIGS. 3 and 4, the slide die 30 which is arranged to be able to move up and down on the slide die guide 13 has an upper surface between the movable die 10a and the door trim main body. It has a mold surface forming a weatherstrip molding cavity 11a following the molding cavity 11, and has a piece shape in which a concave groove 31 for forming a joint surface having a required depth from the upper surface is formed.

In order to mold an automobile door trim using such an injection mold, first, the weather strip mold 20 is matched with the trim mold 10 and the slide mold 30 is raised to perform the above-described weather strip. Cavities 21, 21 for forming the lip of the mold 20
By injecting a molten door trim body molding material such as a polypropylene resin into the door trim body molding cavity 11 with the opening end of the
Since the door trim main body 1 in which the joint surface 1a is formed at the tip of the garnish portion is formed, the slide die 30 is then lowered to form the door trim main body 1 with the joint surface 1a of the garnish portion of the door trim main body 1 formed in the previous process. Since the weatherstrip molding cavity communicating with the molding cavities 21 and 21 is formed between the one side of the weatherstrip molding die 20 and the mold surface, a polypropylene elastomer or the like is formed in the cavity through the gate 12. When the weatherstrip molding material is injected, the weatherstrip 2 in which the joining surface 1a at the tip of the garnish portion of the molded door trim main body 1 and the joining surface 2a at the base are integrally formed is molded. After the completion of the injection molding in this way, it goes without saying that the mold may be opened by a conventional method to take out the molded product.

In the thus obtained product, the weather strip 2 for sealing the window glass is firmly bonded and integrated to the garnish portion of the molded door trim main body 1 with the joining surfaces 1a and 2a welded to each other. It is possible to exhibit a sufficient sealing function for a long period of time without causing any peeling phenomenon, and further,
Unlike the conventional case, the molded door trim body 1 and the weather strip 2 need not be formed in separate molds, and can be produced by one injection mold. Therefore, there is an advantage that the production cost can be greatly reduced. . Further, as shown in FIG. 2, the joining surface 2a of the weather strip 2 is engaged with the engaging projection 1b, which is formed by projecting the joining surface 1a of the molded door trim body 1 from the molded door trim body 1. In the case where the joining surfaces 1a and 2a are joined together as a state, the joining strength is increased because the joining surfaces 1a and 2a are welded not only in a smooth surface but also in an engaged state. Preferably, if the molded door trim body 1 is made of a hard polyolefin-based resin while the weatherstrip 2 is made of a polyolefin-based thermoplastic elastomer, the mechanical strength and elasticity of the material are suitable for an automobile door trim. In addition to the fact that they are similar plastic materials, they have excellent weldability Once again it is assumed that further excellent, becomes more preferable because durability is increased.

[0014]

As is clear from the above description, the door trim for an automobile of the present invention is firmly formed in a state in which a weatherstrip for window glass sealing is welded to a garnish portion of a molded door trim main body at a joint surface of the two. Since it is joined and integrated, it can exhibit a sufficient sealing function for a long period of time without causing any peeling phenomenon, and has an advantage that it can be provided easily and inexpensively, and also has an advantage that the present invention Since the door trim can be easily mass-produced without preparing a separate mold for the above-described products, there is an advantage that facility costs and running costs are low and production costs can be reduced. Therefore, the present invention greatly contributes to the development of industry as an automobile door trim and a method for manufacturing the same, which have eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a main part showing an example of an automobile door trim according to the present invention.

FIG. 2 is a cross-sectional view of a main part showing another example of the automobile door trim according to the present invention.

FIG. 3 is a cross-sectional view of an embodiment of an injection molding die for explaining a method of manufacturing a vehicle door trim according to the present invention.

FIG. 4 is a cross-sectional view showing a state in which the slide mold is lowered in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded door trim main body 1a Joining surface 1b Engagement projection 2 Weather strip 2a Base joint surface 10 Trim molding die 11 Cavity for molding door trim main body 12 Gate 13 Slide type guide 20 Weather strip molding die 21 Cavity for lip molding 30 Slide Mold 31 Groove for forming joint surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F206 AA11 AA45 AG29 AH23 JA07 JL02 JM16 JN12 JN25 JQ81

Claims (4)

[Claims] An automobile door trim having a rigid molded door trim body (1) having a windshield sealing weatherstrip (2) made of an elastic material at the end of a garnish portion thereof, the molded door trim body (1) and the weatherstrip ( 2) means that the base joint surface (2a) of the weatherstrip (2) is joined and integrated with the joint surface (1a) at the tip of the garnish part of the molded door trim body (1) continuously with one injection mold. An automobile door trim, which is an injection-molded product integrated with a molding. 2. A weather strip is formed on an engagement projection (1b) projecting from a joint surface (1a) of the molded door trim main body (1) with the molded door trim main body (1) and the weather strip (2).
2. The door trim for an automobile according to claim 1, wherein the base joint surface (2a) of (2) is joined and integrated in an engaged state. 3. The molded door trim body (1) is made of a hard polyolefin resin, and the weather strip (2) is made of a polyolefin thermoplastic elastomer.
Or the door trim for an automobile according to 2. 4. A trim forming die having a door trim main body forming cavity and a slide die guide portion, a weather strip forming die having a lip portion forming cavity, and a slide die guide portion capable of moving up and down. Using one injection mold including a slide mold to be arranged, first, the weatherstrip mold is matched with the trim mold and the slide mold is raised to open the cavity for forming the lip portion. With the end closed with a slide mold, the door trim body molding material is injected into the cavity for molding the door trim body to form a door trim body having a joint surface formed at the tip of the garnish portion, and then the slide mold is lowered. Between the joint surface of the garnish part of the door trim body molded in the previous process and the mold surface of the weatherstrip mold. By forming a weather strip molding cavity communicating with the lip molding cavity and injecting the weather strip molding material into the cavity, the base joint surface is joined and integrated with the joint surface at the tip of the garnish part of the molded door trim body A method of manufacturing a door trim for an automobile, comprising molding a weatherstrip that has been formed.