JPH03258630A - Molding for automobile - Google Patents

Abstract

PURPOSE:To integrate an insert with the main body of a molding via each resinous pillar by forming a large number of small holes along the entire surface of the insert scatteredly, and applying resin to each small aperture upon extrusion molding to form the resinous pillars. CONSTITUTION:A molding for automobiles, i.g. a molding to be attached to a belt or the like on the exterior surface of a door as for ornament of the door is constituted of an insert 1 made of metal or resin having small coefficient of linear expansion and resin made molding body 3 embedding it. In this instance, a large number of small circular apertures are scatteredly bored along the whole insert 1 in regular arrangement. At the time of extrusion molding of the molding with the insert, thereby, resin enters in each small aperture 2 of the insert 1 to form resinus pillars 5. The insert 1 is caught by each resinous pillars 5 to integrate upper and lower resin for securely joining the insert 1 with the molding body.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a molding for an automobile, and more specifically, an insert made of metal or a resin with a small coefficient of linear expansion is provided as a core material in a molding body made of resin. The present invention relates to an automotive molding of the type including.

(Prior art) This type of inner molding is generally attached to the outer surface of the door in the form of a band for door decoration.
A molding with an insert is usually manufactured by extrusion molding, and has a structure as shown in FIGS. 9 and 10. That is, when extrusion molding the resin molding body 13 having a semi-cylindrical cross section, a metal insert 11 such as an aluminum foil is inserted for the purpose of improving the rigidity of the molding body 13 and suppressing thermal changes in the overall length dimension. The terminal piece 14 is inserted by injection molding to both ends which are extruded and cut to a required size.

(Problems to be Solved by the Invention) The molding manufactured as described above has a problem in that the resin molding body 13 contracts due to changes in the thermal environment during use, that is, repeated heating and cooling. Since the metal insert 11 hardly shrinks, the insert 11 tends not to protrude from the terminal portion.This protrusion of the insert 11 causes a problem that the terminal piece 14 comes off.

As a related technology, it is known to use metal inserts 1 to 21 having notches 22 on both sides of the J shown in FIG. There is. This is provided for the purpose of facilitating bending along the longitudinal direction of the weather strip after extrusion molding. However, such a large notch 22 results in sink marks on the surface due to shrinkage due to cooling after extrusion molding.
Although it may be possible to do this for products such as Unina strips where appearance is not important, it is impossible to ignore the problem of sink marks when it comes to decorative moldings used as exterior products. It is something that cannot be done.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a vehicle insert removal molding that can restrict the relative movement between the insert and the molding body, and can also solve the problem of sink marks. shall be.

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured as follows.

That is, the automotive molding according to the present invention includes an inner insert made of metal or a resin having a small coefficient of linear expansion, and a molding body made of resin that includes this insert, in which A large number of small holes are formed scattered throughout the mold, and the insert and the molding body are fixed to each other by resin columns formed in the small holes during extrusion molding.

(Function) In the automotive molding configured as described above, during extrusion molding, the resin of the molding body enters into the small holes formed in the insert as a core material to form a resin column. The upper and lower resins sandwiching the insert 1~ are integrated by the pillars.This restricts the relative movement of the insert and the molding body.Also, the volume of the small hole itself is small, so The problem of sink marks caused by small holes is also avoided, and initial decorative properties are obtained.

<Example> Hereinafter, an example of the present invention will be specifically described based on the drawings.

<Example 1> First, Example 1 shown in FIGS. 1 to 4 will be described. Figure 1 shows an insert 1 made of a thin metal such as aluminum foil or a resin with a small linear expansion coefficient. It is formed. Reference numeral 3 denotes a molding body made of resin and having a semi-cylindrical shape in cross section, and as shown in FIGS. 2 and 3, the inner inert 1 is inserted into the center thereof as a core material. FIG. 4 shows the molding as a completed product, with terminal pieces 4 joined to both ends in the longitudinal direction.

Such moldings with inserts are manufactured by extrusion molding, but during this extrusion molding, the resin enters the small holes 2 of the inserts 1 to 1, as shown in FIG. A pillar 5 is formed. This resin column 5 inserts 1 into the insert 1 to integrate the upper and lower resin, so the molding body 3 and the insert 1 are firmly fixed.

This restricts as much as possible the shrinkage of the molding body 3 due to changes in the thermal environment and repeated heating and cooling during use as a product, thereby regulating the relative movement between the two. This prevents the insert 1 from protruding from the cutting end.

Therefore, the problem of peeling off of the end piece 4 joined to both ends by injection molding is also solved.

In addition, the amount of resin that enters the small hole 2 formed in the thin insert 1, that is, the amount of resin that forms the resin column 5, is minute, and the contraction of this minute amount of resin is small, so the molding body 3 The occurrence of sink marks on the surface of the machine is avoided, and even if they occur, they will be extremely minor.

<Example 2> Next, Example 2 of the present invention will be described based on FIGS. 5 to 8. In this embodiment, in forming the small hole 2 in the insert 1, the molding has a substantially semi-cylindrical cross-sectional shape, making use of the structural characteristics that the center part is thick and the side parts are thin. They are formed intensively in the central portion of the molding body 3, which corresponds to the thick portion where sink marks are less likely to occur, and are sparsely formed in both side portions, which correspond to the thin portions.

That is, in this embodiment, the small holes 2 are installed at a high density in the center of the insert 1, and at a low density on both sides, thereby reducing sink marks caused by the presence of the small holes 2. The occurrence of molding can be suppressed as much as possible and the original decorativeness of the molding can be obtained. The purpose of installing the small holes 2, which is to prevent relative movement between the inserts 1 to 1 and the molding body 3, can be achieved by the small holes 2 that are present in a high density in the central portion.

In the illustrated embodiment, the small hole 2 is circular, but its shape is not limited and can be changed as appropriate.

(Effects of the Invention) As detailed above, according to the present invention, the relative movement between the insert and the molding body can be firmly regulated by the resin column of the molding body formed in the small hole of the insert. This makes it possible to prevent the terminal piece from peeling off and to improve the dimensional accuracy of the molding length.It also prevents sink marks from occurring on the molding surface and improves the initial decorativeness of the exterior product. We can provide high quality malls with

[Brief explanation of drawings]

1 to 4 show Embodiment 1 of the present invention, FIG. 1 is a perspective view showing a metal insert, FIG. 2 is a perspective view showing the molding body with the insert inserted, and FIG. FIG. 2 is a sectional view taken along the line ■--■, and FIG. 4 is a plan view showing the molding as a completed product. 5 to 8 show Example 2 of the present invention, FIG. 5 is a perspective view showing the insert, FIG. 6 is a perspective view showing the molding body with the insert inserted, and FIG. 7 is a perspective view showing the molding body with the insert inserted. FIG. 8 is a plan view showing the molding as a completed product. Fig. 9 is a perspective view showing a conventional molding body with an insert, Fig. 10 is a plan view showing the molding as a completed product, and Fig. 11 is a perspective view showing an insert with a flare used in weather stripping. be. 1... Insers 1 to 3... Molding body 2... Small hole 5... Resin pillar

Claims (1)

[Claims] An insert made of metal or resin with a small coefficient of linear expansion;
The molding for an automobile is composed of a molding body made of resin that includes the insert, and the insert has a large number of small holes scattered over its entire surface. An automotive molding configured to fix the insert and the molding body using resin pillars.