JPH0379318A - Manufacture of continuous component - Google Patents

Abstract

PURPOSE:To provide a design surface of sufficient rigidity and high smoothness by inserting a reinforcing component and extrusion molding an inner side resin section, and then injection molding an outer resin section in the neighborhood of said inner resin section and forming a mold main body of two layers, inner and outer. CONSTITUTION:A synthestic resin material such as polyvinyl chloride and a belt-shaped reinforcing metal sheet are coextruded by using an extrusion molding machine, and molding is carried out in a manner that reinforcing component 4 is positioned on the surface side of an inner side resin section 2. Then, said inner side resin section 2 is set in a mold of an inection molding machine, and the synthetic resin material such as polyvinyl chloride is injected in the neighborhood of the inner side resin section 2 to form an outer side resin section 3. Thus, a mold main body 1 is formed into two layers, the inner side resin section 2 into which the reinforcing component 4 is inserted, and the outer side resin section 3. The mold main body 1 is provided with sufficient rigidity by said arrangement, and the surface of the outer side resin section 3, that is, a design surface of the mold main body 1, can be formed with high smoothness.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for manufacturing elongated members such as automotive moldings that are attached to the body of an automobile for decoration and cushioning purposes, and particularly relates to a method for manufacturing elongated members such as automotive moldings used for decoration and cushioning purposes. The present invention relates to a method of manufacturing an automobile molding having a two-layer structure including an inner resin part into which is inserted and an outer resin part covering the inner resin part.

[Prior Art] Fig. 5 is a longitudinal sectional view of a molding body formed by the first conventional method for manufacturing an automobile molding, and Fig. 6 is a longitudinal cross-sectional view of a molding body formed by the second conventional method for manufacturing an automobile molding. It is a longitudinal cross-sectional view of a molding main body. Note that the second conventional example is disclosed in Japanese Patent Application Laid-Open No. 1983-
This is a technique disclosed in Japanese Patent No. 67137.

In the first conventional automobile molding, a reinforcing member 12 made of a strip-shaped thin metal plate is bonded to the back surface of a molding body 11 made of synthetic resin. In manufacturing this automotive molding, first, the entire molding body 11 is injection molded from a synthetic resin material using an injection molding machine. In this case, since it is difficult to set the tape-shaped reinforcing member 12 in the injection mold, the reinforcing member 12 cannot be inserted during injection molding of the molding body 11.

Therefore, after injection molding of the molding body 11, the reinforcing member 12 is bonded under pressure while the molding body 11 is heated and softened. Note that the manufactured automobile molding is attached to the vehicle body B of the automobile via a double-sided adhesive tape T.

In the second conventional automobile molding, the molding body 1
3 is composed of two layers consisting of an inner foam resin part 14 and an outer resin part 15 covering it, and the inner foam resin part 14
A reinforcing member 16 made of non-woven fabric is embedded in. When manufacturing this automotive molding, a paste-like synthetic resin material is applied to the mold surfaces of the lower mold 17 and the upper mold 18, and the inside of the lower mold 17 is filled with a foamed synthetic resin material. A reinforcing member 16 is embedded in the lower mold 17 and upper mold 1.
The molding body 13 is molded into two layers from the inner foamed resin part 14 and the outer resin part 15 by high-frequency heating in a mold-matched state and then cooling.

In addition to the above-mentioned conventional example, a technique is also known in which a reinforcing member is inserted and the entire molding body is extruded at once.

[Problems to be Solved by the Invention] However, according to the first conventional method for manufacturing a molding for an automobile, the reinforcing member 12 is bonded after injection molding of the molding body 11, which not only complicates process control but also When retrofitting the reinforcing member 12, there is a waste of heating the molding body 11 again, resulting in increased manufacturing costs.

Further, according to the method of the first conventional example, as described above, since the reinforcing member 12 cannot be inserted during injection molding of the molding body 11, the position of the reinforcing member 12 is on the back side of the molding body 11. However, if the reinforcing member 12 is in this position, sufficient tilling property cannot be imparted to the molding main body 11, and the function of preventing the molding main body 11 from curving when mounted on a vehicle body is also reduced.

On the other hand, according to the second conventional method for manufacturing an automobile molding, troublesome steps are required such as applying the material for the outer resin part to the mold surface and embedding the reinforcing member 16 in the foamed synthetic resin material. This resulted in poor manufacturing efficiency and high costs.

Furthermore, since the reinforcing member 16 is made of non-woven fabric and is located on the back side of the molding body 13, there is a problem that sufficient rigidity cannot be imparted to the molding body 13, as in the first conventional example. Note that high-frequency heating also caused deterioration in the paintability of the outer resin portion 15 after molding.

In addition, according to other conventional methods, the entire molding body is extruded, so there is a problem that the smoothness of the surface of the molding body, that is, the design surface, is lower than that of injection molded products. This is not preferable for elongated members such as automotive moldings, where decorativeness has become important in recent years.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a long member that can reduce manufacturing costs, provide sufficient rigidity to the molding body, and provide a highly smooth design surface.

[Means for Solving the Problems] In order to solve the above problems, the method for manufacturing a long member of the present invention includes inserting a reinforcing member and extrusion molding an inner resin part, and then extruding the inner resin part around the inner resin part. The outer resin part is injection molded, and the molding body is formed into two layers consisting of an inner resin part and an outer resin part.

[Function] According to the method for manufacturing a long member of the present invention, by co-extruding the synthetic resin material and the reinforcing member, the reinforcing member can be easily inserted into the inner resin part, thereby simplifying the manufacturing process. can reduce costs. Further, since the reinforcing member is close to the surface side of the molding body, sufficient rigidity can be imparted to the molding body. Moreover, since the outer resin part is injection molded around the inner resin part, the surface of the outer resin part,
In other words, the design surface of the molding body can be molded with high smoothness,
Decorative properties of automobile moldings, etc. can be improved.

[Example] Hereinafter, an example embodying the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view showing a molding body molded by the method for manufacturing a long member such as an automobile molding according to the first embodiment of the present invention, and FIG. It is a longitudinal cross-sectional view showing an extrusion molding process. FIG. 3 is a longitudinal cross-sectional view of a molding body formed by the elongated member manufacturing method of the second embodiment, and FIG. 4 is a longitudinal cross-sectional view of the molding main body molded by the elongated member manufacturing method of the third embodiment. It is a front view.

As shown in FIG. 1, a molding body 1 of an automobile molding as a long member of this embodiment includes an inner resin part 2 made of a synthetic resin material such as polyvinyl chloride, and an inner resin part 2 made of a synthetic resin material such as polyvinyl chloride.
The outer resin part 3 is made of a synthetic resin material such as polyvinyl chloride, and the outer resin part 3 is made of a synthetic resin material such as polyvinyl chloride. A reinforcing member 4 made of a band-shaped thin metal plate made of aluminum, stainless steel, etc. is embedded inside the inner resin part 2. In this embodiment, the reinforcing member 4 is embedded in the surface side of the inner resin portion 2 so as to be located on the front side from the center of the molding body 1 in the thickness direction. In addition, in FIG. 1, B is a car body, and T is a double-sided adhesive tape for attaching the molding body 1 to the car body B.

Next, a method of manufacturing the automotive molding as a long member of this embodiment configured as described above will be explained.

First, an extrusion molding machine is used to co-extrude a synthetic resin material such as polyvinyl chloride and a strip-shaped thin metal plate made of aluminum, stainless steel, etc., and as shown in FIG. Form part 2. in this case,
so that the reinforcing member 4 is located on the surface side of the inner resin part 2,
The band-shaped thin metal plate is set in an extrusion molding machine.

The inner resin part 2 extruded in this way is then set in the mold of an injection molding machine, and as shown in Fig. 1, a synthetic resin material such as polyvinyl chloride is injected around the inner resin part 2. , mold the outer resin part 3. In this way, the molding main body 1 is formed into two layers including the inner resin part 2 into which the reinforcing member 4 is inserted and the outer resin part 3. In this completed state, the reinforcing member 4 is embedded toward the front side of the molding body 1 from the center in the thickness direction.

In this way, the method for manufacturing the automotive molding of this example is as follows:
After inserting the reinforcing member 4 made of a strip-shaped thin metal plate and extrusion molding the inner resin part 2, the outer resin part 3 is injection molded around the inner resin part 2, and the molding body 1 is combined with the inner resin part 2. It is molded in two layers including the outer resin part 3.

Therefore, according to the manufacturing method of the automotive molding of the above embodiment, the reinforcing member 4 can be easily inserted into the inner resin part 2 by co-extruding the synthetic resin material and the strip-shaped thin metal plate, so that the manufacturing process can be improved. The process can be simplified and costs can be reduced.

Further, since the reinforcing member 4 is embedded in the front side of the molding body 1 from the center in the thickness direction, sufficient rigidity can be imparted to the molding body 1. Furthermore, since the outer resin part 3 is injection molded around the inner resin part 2, the surface of the outer resin part 3, that is, the design surface of the molding body 1, can be molded with high smoothness, improving the decorativeness of the automotive molding. can be improved.

By the way, in the first embodiment, the reinforcing member 4 is entirely embedded in the center of the inner resin part 2, but the present invention is not limited to this, and the second embodiment shown in FIG. As shown, it can also be implemented as an extruded product in which the reinforcing member 4 is integrated on the surface of the inner resin part 2.

Further, in the above embodiment, a strip-shaped thin metal plate is used as the reinforcing member 4, but the present invention is not limited to this, and as shown in the third embodiment of FIG.
It is also possible to use a plurality of metal wires.

In the above embodiment, the inner resin portion 2 is arranged such that the reinforcing member 4 is located on the front side of the center of the molding body 1 in the thickness direction.
However, the present invention does not particularly limit the position of the reinforcing member 4. However, in order to impart sufficient rigidity to the molding body 1, it is preferable to embed the reinforcing member 4 at least on the outer side of the molding body 1 from the central position in the thickness direction.

[Effects of the Invention] As described above, the method for manufacturing a long member of the present invention includes inserting a reinforcing member and extrusion molding the inner resin part, and then injection molding the outer resin part around the inner resin part. Since the molding main body is molded in two layers from the inner resin part and the outer resin part, the manufacturing process can be simplified and costs can be reduced, and the reinforcing member can be brought closer to the surface side of the molding main body. Sufficient rigidity can be imparted to the molding body, and,
There is an effect that the surface of the outer resin part can be molded with high smoothness by injection molding, and the decorativeness of the elongated member can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a molding body molded by the method for manufacturing a long member according to the first embodiment of the present invention, and FIG.
FIG. 3 is a longitudinal cross-sectional view showing the extrusion molding process of the inner resin part of the molding body shown in FIG.
The figure is a longitudinal cross-sectional view of a molding body molded by the elongate member manufacturing method of the third embodiment of the present invention, and FIG. 5 is a longitudinal cross-sectional view of the molding main body molded by the elongate member manufacturing method of the first conventional example. The top view and FIG. 6 are longitudinal cross-sectional views of a molding body formed by the second conventional method for manufacturing an elongated member. In the figure, 1: molding main body, 2: inner resin part, 3: outer resin part, 4: reinforcing member. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] (1) Insert the reinforcing member and extrusion mold the inner resin part, then injection mold the outer resin part around the inner resin part to form a molding body with two layers consisting of the inner resin part and the outer resin part. 1. A method for manufacturing a long member, characterized in that it is formed into a long member.