JPS6251412A - Manufacture of vehicular molding - Google Patents

Abstract

PURPOSE:To make the manufacture of a highly decorative molding, the join line of which is out of eyesight, by a method wherein a base material with a constant cross-sectional shape and a decorative member with a variable cross-sectional shape are injection-molded into an integrally joint body. CONSTITUTION:Firstly, a core material 21 with a nearly L-shaped cross-section consisting of a base 21a and a joint surface 21b is manufactured by rolling a metal plate or the like and, after that, supplied to an extrusion mold so as to extrusion-mold a resin part 6a, which covers both the sides of the base 21 a and soft polyvinyl chloride draining lips 7, which extrude from one side surface of the base, in order to form a base material 22 with a constant cross-sectional shape. The base material 22 is cut according to prescribed dimensions, in which the draining lips 7 at the tip 9 are cut in order to form a notched part 10. On the other hand, a decorative member 23 with a nearly L-shaped and lengthwise variable cross-section consisting of a decorative surface 23a and a joint surface 23b is formed by pressing a metal plate such as stainless steel or the like. Secondly, the base material 22 and the decorative member 23 are piled up with the joint surfaces 21b and 23b so as to be joined by spot-welding 24 or the like in order to form a composite material 25. In addition, through holes 26 are made in the joint surfaces 21b and 23b.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a method of manufacturing moldings for vehicles.

In particular, the present invention relates to a method for manufacturing a vehicle molding, which is suitable for manufacturing a weather strip belt molding to be attached to a vehicle door.

[Conventional technology]

Fig. 6 is a perspective view of the vehicle, Fig. 7 is a perspective view of the weather strip belt molding, Fig. 8 (A) is a cross-sectional view taken along line AA in Fig. 7, and Fig. 8 (B) is a cross-sectional view taken along line B-B in Fig. 7. . In the figure, 1 is a vehicle body, and a weather strip belt molding 4 on which a window glass 3 slides is attached to the upper edge of a door 2. The molding 4 has a draining knob 7 that integrally extends to one side from a resin part 6 that covers a metal plate profile 5 that is substantially U-shaped and has an opening at the bottom, and an end cap 8 formed at the end. . This molding 4 has a notch 10 formed in the tip 9 to prevent interference with door mirrors, etc., and a band-shaped protrusion to align the tip 9 with the vehicle body panel or to diversify the decoration. There are some cases in which the cross-sectional shape of the tip portion 9 changes, such as by widening the surface bright portion 11 consisting of the tip portion 9 at the tip portion 9.

In the conventional manufacturing method of this type of molding, a profiled material 5 made by roll-forming a metal plate is supplied to an extrusion mold, and a main body part 12 having a resin part 6 and a lip 7 formed thereon by extrusion molding has a cross-sectional shape. There is a method of joining different tip portions 9.

[Problem that the invention seeks to solve]

However, in such a conventional molding manufacturing method, the main body portion 12 of the elongated molding 4
There was a problem in that a joining line was formed between the end portion 9 and the end portion 9, impairing the decorativeness. Further, when such moldings are manufactured by press working and injection molding, there is a problem in that the press mold and the injection mold become large and complicated.

This invention is intended to solve the above problems.

The relatively small and simple device allows the joining line to be hidden from the naked eye.
It is an object of the present invention to provide a method for manufacturing a molding for a vehicle that can manufacture a highly decorative molding.

[Means for solving problems]

The present invention includes a step of forming a base material having a constant cross-sectional shape by extrusion molding so as to have a resin portion covering the substrate and a core material made of a hard material having a bonding surface and a lip protruding from one side thereof; forming a decorative member having a predetermined decorative surface and a joint surface and whose cross-sectional shape changes along the longitudinal direction; joining the base material and the decorative member at the joint surface and inserting the decorative member into an injection mold; This method of manufacturing a molding for a vehicle includes a step of forming another resin part on a joint part and a part of a decorative member by injection molding.

[For production]

In the method of manufacturing a molding for a vehicle of the present invention, a core material having a substrate and a bonding surface is manufactured by roll forming a metal plate, etc., and this is supplied to an extrusion mold to form a resin part and a lip covering the substrate. Extrusion molding is performed to form a base material with a constant cross-sectional shape. On the other hand, a decorative member having a decorative surface and a joint surface and whose cross-sectional shape changes along the longitudinal direction is formed by press molding a metal plate or the like. Then, the base material and the decorative member are joined at their respective joint surfaces and inserted into an injection mold, and another resin part is formed at the joined part and a part of the decorative member by injection molding to complete the molding.

In this way, a molding whose longitudinal cross-sectional shape changes is divided vertically, the parts whose cross-sectional shape does not change are formed by extrusion molding, and the parts whose cross-sectional shape changes are formed by press molding, etc., and then joined. However, by further forming the resin part by injection molding, it is possible to manufacture a molding in which the joining line is not exposed using a simple device.

〔Example〕

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. 1st
The figure is a perspective view of a base material in an embodiment of the present invention, FIG. 2 shows a decorative member, (A) is a perspective view cut along the A-A plane in FIG. 7, and (B) is a B-B plane. 3 shows a composite material, (A) is a perspective view cut along the A-A plane,
(B) is a perspective view cut along the plane B-B, and FIG. 4 is a sectional view taken along the plane A-A showing the injection mold, and the same reference numerals as in FIGS. 6 to 8 indicate the same or corresponding parts. .

As shown in FIG. 1, the method for manufacturing the molding 4 is as follows: First, a core material 21 having a substrate 21a and a bonding surface 21b and having an L-shaped cross section is manufactured by roll forming a metal plate, etc. A resin part 6a that is supplied to the resin part 6a and covers both sides of the substrate 21a, and a draining knob 7 that protrudes from one side thereof.
is extrusion-molded using a soft vinyl chloride resin or the like to form a base material 22 having a constant cross-sectional shape. This base material 22 is cut into a predetermined size, and the draining knob 7 of the tip part 9 is cut to form a notch 1.
form 0.

On the other hand, as shown in FIG. 2, by press forming a metal plate such as stainless steel, the cross section including the decorative surface 23a and the joint surface 23b is approximately L-shaped, and the cross-sectional shape changes along the longitudinal direction. A member 23 is formed. On the decorative surface 23a of the decorative member 23.

As shown in FIG. 2(A), a surface bright portion 11 consisting of a band-shaped protrusion is formed in the main body portion 12.

As shown in FIG. 2(B), this surface bright portion 11 is formed at the tip portion 9 so as to spread over the entire decorative surface 23a.

Further, the end 9a of the tip portion 9 is formed into an inclined shape by drawing.

Next, as shown in FIG. 3, the base material 22 and the decorative member 23 are polymerized at their joint surfaces 21b and 23b, and joined by spot welding 24 or the like to form a composite material 25. A through hole 26 is formed. Then, as shown in FIG. 4, the composite material 25 is inserted into the injection mold 27 and the mold is clamped, and the molten resin is injected except for the surface bright part 11 of the decorative member 23, and the joint surfaces 21b, 23b and A resin portion 6b covering a part of the decorative surface 23a and an end cap 8 are formed to complete the molding 4.

At this time, the resin portion 6b connects both sides of the through hole 26, increasing the adhesion.

In the thus obtained molding 4, the joint between the base material 22 and the decorative member 23 is covered with the resin part 6b, so the joint line is not exposed, the decorativeness is enhanced, and the molding is sealed to prevent water from entering.

FIG. 5 is a sectional view showing a molding manufactured according to another embodiment, in which the base material 22 and the decorative member 23 are joined by caulking 28. In addition, joining may be performed by riveting or other means.

In the above embodiment, a press-molded metal plate was used as the decorative member 23, but it may also be injection molded from a hard synthetic resin such as ABS resin, and its surface may be subjected to bright treatments such as chrome plating, vacuum metallization, or colored coating. You may also use one that has been given a

〔Effect of the invention〕

According to this invention, injection molding is performed by joining a base material with a constant cross-sectional shape and a decorative member with a variable cross-sectional shape, so that the joining line is not visible and the decorative and sealing properties are high. As a result, it is possible to produce a molding having a variable cross-sectional shape using a simple device.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a base material according to an embodiment of the present invention, FIG. 2 is a decorative member, (A) is a perspective view taken along the line A-A in FIG. 7, and (B) is a perspective view of a B-- A perspective view cut along plane B, Figure 3 shows the composite material, (A) a perspective view cut along plane A-A, (B) a perspective view cut along plane B-B, and Figure 4 shows the injection material. 5 is a sectional view showing a molding of another embodiment; FIG. 6 is a perspective view of a vehicle; FIG. 7 is a perspective view of a weather strip belt molding; Figure 8 (A) is a sectional view taken along line A-A in Figure 7, (
B) is a BB sectional view. In each figure, the same reference numerals indicate the same or corresponding parts. 4 is a molding, 6, 6a, 6b are resin parts, 7 is a drainer, 11 is a surface brightening part, 21 is a core material, 21a is a substrate, 21b, 23b are joint surfaces, 22 is a base material, 23 is a decorative member, 23a is a decorative surface, 25 is a composite material, and 27 is an injection mold. Agent Patent Attorney Sei Yanagihara Fig. 4 4: 7-Ring 27: Injection S, 1F > Mold Fig. 5

Claims (3)

[Claims] (1) A process of forming a base material with a constant cross-sectional shape by extrusion molding so as to have a resin part covering the base plate and a core material made of a hard material having a bonding surface and a lip protruding from one side thereof; forming a decorative member having a decorative surface and a joint surface and whose cross-sectional shape changes along the longitudinal direction; joining the base material and the decorative member at the joint surface, inserting the base material and the decorative member into an injection mold and injecting the decorative member; A method for producing a molding for a vehicle, comprising the step of forming another resin part in a joint part and a part of a decorative member by molding. (2) The manufacturing method according to claim 1, wherein the core material is manufactured by roll forming a metal plate. (3) The manufacturing method according to claim 1 or 2, wherein the decorative member is manufactured by press molding of a metal plate or injection molding of a hard synthetic resin.